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Dissertations / Theses on the topic 'Digital signal controller'
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Garate, Inaki. "Entirely digital permanent magnet synchronous machine controller by a single digital signal processor chip." Thesis, Staffordshire University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.237841.
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Jiang, Guoyou. "Design and Implementation of a DMA Controller for Digital Signal Processor." Thesis, Linköping University, Computer Engineering, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-58868.
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The thesis work is conducted in the division of computer engineering at thedepartment of electrical engineering in Linköping University. During the thesiswork, a configurable Direct Memory Access (DMA) controller was designed andimplemented. The DMA controller runs at 200MHz under 65nm digital CMOS technology. The estimated gate count is 26595.
The DMA controller has two address generators and can provide two clocksources. It can thus handle data read and write simultaneously. There are 16channels built in the DMA controller, the data width can be 16-bit, 32-bit and64-bit. The DMA controller supports 2D data access by configuring its intelligentlinking table. The DMA is designed for advanced DSP applications and it is notdedicated for cache which has a fixed priority.
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Seward, John F. "A DSP based general self-tuning observer controller /." Online version of thesis, 1993. http://hdl.handle.net/1850/11705.
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Day, Richard Harvey. "A DSP controller for a low cost radar interface." Thesis, Nottingham Trent University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297738.
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Mostert, J. P. F. "Generic energy storage controller for a power conditioner." Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/53744.
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Thesis (MEng)--Stellenbosch University, 2004.ENGLISH ABSTRACT: This thesis presents the design of a DSP based controller system for an auxiliary converter for generic energy storage connection to a line-interactive power compensator. The aim is to utilize a wide range of energy storage systems and incorporate them into the existing power compensator. This was done by adding a second converter to the system. The new controller was developed to control this converter and thereby the energy storage. A study was done on lead acid batteries, flow batteries and flywheels in order to gain a basic understanding of these systems and identify the requirements for their control. Based on these findings, a new DSP based controller and measuring system was developed. To test the new system a dc to dc converter was implemented for the control of lead acid and flow batteries. A dc to ac converter was also tested for the control of flywheel energy storage.
AFRIKAANSE OPSOMMING: Die tesis handeloor die ontwerp van'n DSP gebaseerde beheerstelsel vir 'n Iyninteraktiewe on-onderbreekbare kragbron met drywings-kompensasie met 'n hulp omsetter vir algemene enegiestoor koppeling. The doel is om 'n wye verskeindheid energie store in die huidige drywings elektroniese stelsel te inkorporeer. 'n Tweede omstetter is by die stelsel gevoeg om die energie stelsel te beheer. 'n Nuwe beheerder is ontwikkel om die omsetter te beheer en daardeur die energie stoor. Loodsuur batterye, vloei batterye en vliegwiele is ondersoek om 'n basiese begrip te vorm en te identifiseer wat nodig is vir die beheer van sulke energie store. Die nuwe DSP beheerder en meetstelsel is ontwikkel gebaseer op hierde ondervindings. Om die nuwe beheerstelsel te toets is 'n gs na gs omsetter geïmplementeer vir die beheer van loodsuur en floei batterye. Die omsetter is geherkonfigureer na 'n gs na ws opstelling en getoets. Die konfigurasie word gebruik vir die beheer van vliegwiele.
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Bhatnagar, Purva. "A microcontroller-based Electrochemical Impedance Spectroscopy Platform for Health Monitoring Systems." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1439307617.
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Charpentier, Arnaud. "Active Control Of Noise Radiated From Personal Computers." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/35711.
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As an indirect consequence of increased heat cooling requirements, personal computers (PC) have become noisier due to the increased use of fans. Hard disk drives also contribute to the annoying noise radiated by personal computers, creating a need for the control of computer noise.
Due to size constraints, the implementation of passive noise control techniques in PC is difficult. Alternatively, active noise control (ANC) may provide a compact solution to the noise problems discussed above, which is the subject of this work.
First, the computer noise sources were characterized. The structure-borne path was altered passively through the decoupling of the vibrating sources from the chassis. Global noise control strategy was then investigated with a hybrid passive/active noise control technique based on folded lined ducts, integrating microphones and speakers, that were added to the PC air inlet and outlet. While the ducts were effective above 1000Hz, the use of a MIMO adaptive feedforward digital controller lead to significant noise reduction at the ducts outlets below 1000Hz. However, global performance was limited due to important airborne flanking paths. Finally, the same type of controller was used to create a zone of quiet around the PC user head location. It was implemented using multimedia speakers and microphones, while the computer was placed in a semi-reverberant environment. A large zone of quiet surrounding the head was created at low frequencies (250Hz), and its size would reduce with increasing frequency (up to 1000Hz).Master of Science
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Stejskal, Jiří. "Měnič 12V DC/230V AC." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218761.
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This diploma thesis describes particular parts of power inverter such as gate driver, DSC, LC filter, low power supply, DC/DC converter and four-quadrant bridge and manner of its control by digital signal controller. Inverter is designated for generating of a mobile artificial electric grid (for example in a car).
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Rukchonlatee, Pichit. "A DSP-controlled limited angle torque motor." Thesis, Loughborough University, 1997. https://dspace.lboro.ac.uk/2134/27151.
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Bi, G. "Application of mode controlled logic to pipelined serial signal processing]." Thesis, University of Essex, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381239.
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Fells, Graham. "Digital signal processor based magnetic bearing controllers for energy storage flywheels." Thesis, University of Sussex, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.424399.
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Kočík, Karol. "Modul osciloskopu s bezdrátovým přenosem dat." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221279.
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The aim of the thesis is the design and realization of the oscilloscope module with wireless data transfer. One part of the thesis is a short overview of the different types of AD converters. The main part is focused on the hardware configuration that allows modification of the wireless module of the oscilloscope, and the possibility of using in the industrial zone. The design takes into account reducing of consumption and EMC compatibility.
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Sun, Yi. "Modeling and Design of Digitially Controlled Voltage Regulator Modules." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/36447.
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It can be expected that digital controllers will be increasingly used in low voltage, high-current and high frequency voltage regulator modules (VRMs) where conventional analog controllers are currently preferred because of the cost and performace reasons. However, there are still remaining two significant challenges for the spread of the digital control techniques: quantization effects and the delay effects.
Quantization effects might introduce the limit cycle oscillations (LCOs) to the converter, which will generate the stability issues. Actually, LCOs can not be totally eliminated theoretically. One way to reduce the possibilities of LCOs is to employ a high resolution Digital Pulse-Width-Modulator (DPWM). However, designing such a DPWM which can meet the requirements of VRMs application requires ultra-high system clock frequency, up to several GHz. Such high frequency is impractical due to huge power consumption. Hybrid DPWM might be an alternative solution but will occupy large silicon area. Single phase digital constant on-time modulation method is another good candidate to improve the DPWM resolution without adding too much cost. However, directly extending this method to multi-phase application, which is the prevalent structure in VRMs application, will introduce some issues. With more phases in parallel, the duty cycle resolution will drop more.
To solove the mentioned issue, this work proposed a multi-phase digital constant on-time modulation method. The proposed method will control the control voltage to alternate between two adjacent values, or dither, within one switching period. The outcome is that the phase duty cycleâ s resolution is improved and independent on phase number. Compared with conventional constant frequency modulation method, the proposed method can achieve about 10 times higher duty cycle resolution for the VRM application. The effectiveness of the proposed method is verified by the simulation as well as the experiment results.
Delay effect is another concern for the digital controlled VRMs. There exist several types of delays in the digital feedback loop, including the ADC conversion delay, digital compensator calculation delay, DPWM delay as well as some propagation delays. Usually these delays are inside the digital controller and it is hard to know the exact values. There are several papers talking about the small signal models of the digital voltage mode control. These models are valid only if all the delay terms are known exactly since each delay is considered separately. Actually, this process is not easy. Moreover, there is no literature talking about the complete small signal model of the digital VRMs. But in reallity, different implementations of the sampling process will give different impacts to the loop.
This work proposed the small signal signal models of digital VRMs. The analysis is based on the assumptions that DPWM is a double-edge modulation and the sampling instants are aligned with the middle of one phaseâ s off time. At first, the conversion and calculation delay is neglected. The focus of the modeling is on the small signal model of the current sampling methods and the DPWM delay. This model is valid for those digital controllers which have fast ADC and fast calculation capabilities. It is shown that even with a â fastâ controller, the current sampling and DPWM might introduce some delay to the loop.
After that, the conversion and calculation delay are considered into the modeling. Two time periods, T1ff and T1rr, are employed to describe the total delay effects in the control loop. It is observed that the total delay in the loop is integral times of sampling periods, which is never reported by any other literatures. Therefore, the proposed model only includes one delay term and the value of this delay can be found through a pre-determined lookup table. Finally, the complete small signal model of the digital VRMs considering the conversion and calculation delay is proposed. This model is helpful for the researchers to find the delay effects in their control loop based on the range of the total physical delay in the controller.
With the derived small signal mondels of digital VRMs, the design guildeline for AVP control are presented. The digital active-droop control is employed and it borrows the concept of constant output impedance control from the analog world. Two design examples are provided for the verification.Master of Science
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Pijáček, Ondřej. "Univerzální řídicí jednotka pro BLDC motory." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-240819.
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This thesis describes the design of universal control unit for BLDC motor powered from airplane power distribution system of 28 V capable of driving motor up to 10 A. The maximal engine power is about 250 W. Important prerequisite is possibility of driving various motor size without needs of changing wiring board using only the configuration in the auxiliary memory unit. To control different motors is enough one unit with one program without any way to interfere to the unit itself.
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Gnoatto, Claudio Lucas. "Estratégias de controle repetitivo para aplicação em sistemas de alimentação ininterrupta de energia." Universidade Tecnológica Federal do Paraná, 2011. http://repositorio.utfpr.edu.br/jspui/handle/1/222.
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CAPESEste trabalho tem como objetivo a análise, projeto e implementação de estratégias de controle repetitivo para aplicação em sistemas de alimentação ininterrupta de energia (UPS - Uninterruptible Power Supply). Inicialmente, a revisão da literatura aborda os controladores mais aplicados neste propósito. Uma visão geral sobre sistemas UPS é realizada, com foco em diferentes topologias e o projeto de um filtro indutivo capacitivo (LC), para reduzir o conteúdo harmônico proveniente das comutações do inversor, é discutido. Na sequência, uma estratégia de controle é proposta. Nesta estratégia um termo feedforward é utilizado para gerar a forma de onda da tensão de saída e um controlador do tipo proporcional derivativo (PD) é inserido para compensar distúrbios não cíclicos. Para compensação de distúrbios cíclicos, algumas técnicas de controle repetitivo são analisadas e implementadas. A adição destes controladores apresenta bom desempenho, porém, quando o sistema sofre interferências, as características dinâmicas destes controladores são afetadas. Modificações são realizadas para tornar o sistema menos suscetível a ruídos de alta frequência e a distúrbios aperiódicos. Ainda, é proposto um controlador repetitivo com adaptação do ganho que apresenta robustez suficiente para boa regulação de tensão mesmo na presença de distúrbios aperiódicos e interferências eletromagnéticas. Por fim, é descrita a implementação de uma plataforma flexível, baseado em um inversor PWM controlado por um processador digital de sinais com periféricos para aquisição de dados e geração de PWM, DSC TMS320F28335. A partir desta plataforma, foram obtidos resultados experimentais para um protótipo de uma UPS monofásica, os quais comprovam o desempenho das técnicas de controle apresentadas e propostas.
This work presents an analysis, design and implementation of repetitive control strategies applied to uninterruptible power supplies (UPS) systems. At the beginning, a literature review of the main controllers concerning this purpose is shown. A global vision of UPS systems with focus on different topologies is made and the project of an inductive capacitive filter (LC) is presented where the goal is to reduce harmonic content due to the inverter switching. After that, a control strategy is presented. In this strategy a feed forward term is used to generate the wave form shape of the output voltage and a Proportional Derivative (PD) controller is introduced to compensate non cyclic disturbances. For the compensation of cyclic disturbs some repetitive control techniques are analyzed and implemented. The inclusion of these controllers provides a good performance for the output system, however, when the system is exposed to interferences, the dynamic characteristics of these controllers are affected. Modifications are presented to make the system less susceptible for high frequencies noise and aperiodic disturbs. In addition, a repetitive controller with gain adaptation is proposed with sufficient robustness to obtain a good voltage regulation even in the presence of aperiodic disturbances and electromagnetic interferences. Finally, the implementation of a flexible platform is presented, based on PWM inverter controlled by a digital signal processor with data acquisition and generation PWM peripherals, DSP TMS320F28335. From this platform, experimental results for a monophasic UPS prototype was obtained, which ones prove the performance of the control techniques presented and proposed.
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Natali, Francis D., and Gerard G. Socci. "DIGITAL RECEIVER PROCESSING TECHNIQUES FOR SPACE VEHICLE DOWNLINK SIGNALS." International Foundation for Telemetering, 1985. http://hdl.handle.net/10150/615711.
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International Telemetering Conference Proceedings / October 28-31, 1985 / Riviera Hotel, Las Vegas, NevadaDigital processing techniques and related algorithms for receiving and processing space vehicle downlink signals are discussed. The combination of low minimum signal to noise density (C/No), large signal dynamic range, unknown time of arrival, and high space vehicle dynamics that is characteristic of some of these downlink signals results in a difficult acquisition problem. A method for rapid acquisition is described which employs a Fast Fourier Transform (FFT). Also discussed are digital techniques for precise measurement of space vehicle range and range rate using a digitally synthesized number controlled oscillator (NCO).
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Delfino, Leandro César. "Controle ativo de ruído em dutos utilizando processadores digitais de sinais." Universidade Federal de Uberlândia, 2005. https://repositorio.ufu.br/handle/123456789/15033.
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Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorAcoustical noises are known as pollution sources that cause adverse effects in human life. Considerable investigations have been done to development of the new technologies in Active Noise Control. This work presents and experimentally analyses algorithms of Active Noise Control in Ducts presented in literature, including Feedforward algorithms, Feedback algorithms and Hybrid algorithms that uses both concepts. The identification of secondary path and feedback path is presented and solutions are discussed. In this way, methods of off-line and on-line modeling are presented. A short introduction about acoustics in ducts is presented and some effects that the acoustical noise can cause in human being are also discussed. Problems about the sensors and actuators displacement in the duct system, causality and signal conditioning are also argued here. An introduction about Digital Signal Processors (DSPs) e some particularities found in the development of this works are presented. In order to evaluate the control algorithms performance, an experimental acoustic duct using a standard PVC water pipe was built, where those algorithms were implemented in a DSP platform TMS320LF240A from Texas Instruments®. An analysis is done about the difficulty and recourses used for which algorithm implemented. This work ends presenting and discussing the obtained results for the different control procedures studied and pointing to some future works.
Ruídos acústicos são conhecidos como fontes de poluição sonora que podem causar efeitos adversos na vida humana. Para solucionar estes problemas, interesse considerável tem sido mostrado em Controle Ativo de Ruído. O intuito deste trabalho é estudar e analisar os principais algoritmos de Controle Ativo de Ruído presentes na literatura, incluindo algoritmos de malha aberta (Feedfoward) e de malha fechada (Feedback), bem como um sistema híbrido que utilize os dois conceitos. Os problemas relacionados aos caminhos secundário e de realimentação são apresentados e algumas soluções são discutidas. Neste âmbito, metodologias de modelagem off-line e online são apresentadas. Uma pequena introdução à acústica básica em dutos é apresentada e alguns efeitos que o ruído acústico pode causar ao ser humano são discutidos. Uma discussão é realizada a respeito do arranjo físico do sistema, incluindo escolha e posicionamento dos transdutores eletroacústicos. Problemas de causalidade e do condicionamento de sinais também são discutidos. Uma introdução a respeito dos Processadores Digitais de Sinais (DSPs) e algumas particularidades encontradas durante o desenvolvimento deste trabalho são apresentadas. Para validar a performance de alguns algoritmos de controle, montou-se uma bancada experimental constituída de um duto hidráulico de PVC utilizado como duto acústico, onde estes algoritmos foram implementados em linguagem C em uma plataforma DSP da Texas Instruments do tipo TMS320LF240A. Uma análise é realizada com respeito à dificuldade e recursos utilizados por cada algoritmo implementado. Resultados e discussões são apresentados com respeito à performance dos sistemas de controle.
Mestre em Engenharia Mecânica
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Ortolan, Rodrigo Lício. "Estudo e avaliação de técnicas de processamento do sinal mioelétrico para o controle de sistemas de reabilitação." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/18/18133/tde-19112002-153337/.
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Este trabalho tem a finalidade de analisar algumas técnicas de processamento do sinal mioelétrico, de forma a possibilitar uma posterior implementação de um circuito, que reconheça este sinal e apresente como saída um sinal de controle a ser utilizado em sistemas de reabilitação. Foram simuladas e avaliadas três técnicas de filtragem para o sinal mioelétrico, a fim de atenuar a interferência dos principais ruídos que corrompem este sinal. As técnicas avaliadas foram: filtragem digital clássica; cancelamento de ruído adaptativo e reconstrução do sinal por meio das componentes obtidas pela transformada wavelet. Também foi implementado e analisado um sistema simplificado de reconhecimento dos padrões para este sinal, realizado por meio de uma rede neural artificial, em que foi aplicado em sua entrada o próprio sinal mioelétrico e não suas características obtidas por processamentos matemáticos. Diante dos resultados obtidos os canceladores de ruído adaptativos apresentaram melhores resultados com relação às outras técnicas de filtragem. Apesar de não ter sido adequada para a filtragem, a transformada wavelet mostrou-se uma poderosa ferramenta de análise de sinais, em virtude da sua característica multiresolução. A técnica utilizada para reconhecer os padrões do sinal mostrou bons resultados com os sinais analisados.This work has the purpose to analyze some techniques for myoelectric signal processing, towards a subsequent implementation of a circuit which can recognize this signal and present as output a control signal to be used in rehabilitation systems. Simulation and evaluation of three filtering techniques for the myoelectric signal were done in order to attenuate the main interferences of noises which corrupt this signal. The evaluated techniques were: classic digital filtering; adaptive noise cancelling and the signal reconstruction through the obtained components by the wavelet transform. A simplified system of pattern recognition for this signal also was implemented and analyzed, accomplished through an artificial neural network. The myoelectric signal itself was applied to the input instead of its characteristics obtained by mathematical processing. According to the results obtained the adaptive noise cancelling presented better results in comparison to the other filtering techniques. Despite not being adequate for filtering, the wavelet transform proved to be a powerful tool for signal analysis, by virtue of its multiresolution characteristics. The technique used to recognize the signal patterns has shown good results with the analyzed signals.
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Nogueira, Neto Guilherme Nunes 1978. "Viabilidade do emprego de mecanomiografia no controle motor artificial em lesados medulares empregando estimulação elétrica neuromuscular." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260582.
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Orientadores Vera Lúcia da Silveira Nantes Button, Percy NohamaTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação
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Resumo: A lesão medular afeta a condução dos sinais motores e sensoriais na medula. Com isso, a realização de movimentos voluntários por pessoas com lesão medular é prejudicada quando não impossível. A estimulação elétrica neuromuscular (EENM) é uma técnica que pode auxiliá-los a contornar essas dificuldades, pois possibilita ativar a musculatura de um membro paralisado. Embora a EENM em malha aberta seja capaz de produzir movimentos em um membro paralisado, ele não é capaz de compensar automaticamente desvios angulares devidos a distúrbios. Fenômenos supressores de desempenho muscular como a fadiga muscular e a adaptação neuronal podem comprometer a qualidade de um movimento funcional evocado artificialmente. Por isso, sistemas de controle são incorporados a estimuladores elétricos. A mecanomiografia (MMG) pode fornecer informações sobre a condição de um músculo em contração. Este trabalho investiga a viabilidade do emprego de sinais de MMG no controle da aplicação de EENM visando a sua incorporação em estratégias de controle de membros inferiores (MMII) em lesados medulares sem treinamento. Para isso, foi desenvolvido um sistema integrado de monitoração multiparamétrica e EENM com capacidade de incorporação do sinal de MMG na estratégia de controle. Um ensaio com voluntários hígidos e contrações isométricas de membros superiores (MMSS) apontou variações em parâmetros de MMG no início e final da contração. Outro ensaio analisou o sinal de MMG e de ângulo com controle de EENM em malha e cadeia abertas para indivíduos hígidos e lesados medulares. Sinais de MMG e EENM em contrações dinâmicas de MMII foram registrados. Com o sistema integrado, aplicou-se EENM com controle de ângulo de joelho em malha fechada obtendo- se estabilidade angular do joelho de um lesado medular. Finalmente, o sistema integrado aplicou controle para estabilizar o ângulo de joelho e monitorar sinais de MMG. Os resultados de ensaios experimentais mostraram que parâmetros espectrais, como a frequência média de potência, apresentaram variações entre o início e o fim da contração quando a amplitude de EENM apresentou taxas de incremento mais elevadas. Conclui-se que existe viabilidade no emprego de MMG em estratégias de controle de EENM para MMII de lesados medulares em estabilidade angular, observando-se a taxa de incremento/decremento da saída do estimulador
Abstract: Spinal cord injury affects conduction of motor and sensory signals that flow through the spinal cord. Therefore, the performance of voluntary movements by spinal cord injured (SCI) persons is impaired, if not impossible. Neuromuscular electrical stimulation (NMES) is a technique that aids SCI individuals to overcome these difficulties, because it allows activation of paralyzed limb muscles. Though NMES in open loop and in open chain tasks is able to generate movements in paralyzed limbs, it is not capable to automatically compensate for angle deviations due to disturbances. Suppressive phenomena of muscle performance, such as muscle fatigue and motor neuron adaptation, can compromise the quality of an artificially elicited functional moment. Thus, closed-loop control systems are merged with electrical stimulators. Mechanomyography (MMG) can provide information about a contracting muscle condition. This work proposes to investigate the feasibility of using MMG signals in the control of NMES application aiming its incorporation in lower limb control strategies of untrained spinal cord injured persons. An integrated system was built, comprising a multiparametric acquisition system and a closed-loop controlled neuromuscular electrical stimulator. The integrated system is able to incorporate MMG signals in the control strategy. A test with healthy volunteers performing upper limb isometric contractions indicated variations in MMG parameters between the beginning and end of contraction. Another test investigated MMG signals and joint angles with NMES in open loop and in open chain to healthy and SCI individuals. NMES and MMG signals during lower limb dynamic contractions were registered. Using the integrated system, NMES was applied to the control of knee angle in closed loop configuration ensuring angular stability of both knees on a single SCI volunteer. Finally, the integrated system applied closed loop control to stabilize the knee angle, and monitored MMG signals. Experimental results revealed that spectral parameters such as mean power frequency presented variations between the beginning and end of contraction when NMES amplitude showed higher amplitude increase rates. In conclusion, there is feasibility of using MMG signals in control strategies of NMES for lower limbs of SCI persons in reasonable angle stability. However, one must observe the stimulator output increase/decrease rate
Doutorado
Engenharia Biomedica
Doutor em Engenharia Elétrica
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Terlemez, Bortecene. "Oscillation Control in CMOS Phase-Locked Loops." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4841.
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Recent advances in voltage-controlled oscillator (VCO) design and the trend of CMOS processing indicate that the oscillator control is quickly becoming one of the forefront problems in high-frequency and low-phase-noise phase-locked loop (PLL) design. This control centric study explores the limitations and challenges in high-performance analog charge-pump PLLs when they are extended to multiple gigahertz applications.
Several problems with performance enhancement and precise oscillator control using analog circuits in low-voltage submicron CMOS processes, coupled with the fact that analog (or semi-digital) oscillators having various advantages over their digitally controlled counterparts, prompted the proposal of the digitally-controlled phase-locked loop. This research, then, investigates a class of otherwise analog PLLs that use a digital control path for driving a current-controlled oscillator. For this purpose, a novel method for control digitization is described where trains of pulses code the phase/frequency comparison information rather than the duration of the pulses: Pulse-Stream Coded Phase-Locked Loop (psc-PLL).
This work addresses issues significant to the design of future PLLs through a comparative study of the proposed digital control path topology and improved cutting-edge charge-pump PLLs.
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Fantini, Mattia. "Le macchine multifase nelle applicazioni Sensorless:indagine teorico-sperimentale di un azionamento basato su DSP per macchine asincrone eptafase." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amslaurea.unibo.it/1647/.
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Fino ad un recente passato, le macchine elettriche di tipo trifase costituivano l’unica soluzione in ambito industriale per la realizzazione di azionamenti di grande potenza. Da quando i motori sono gestiti da convertitori elettronici di potenza si è ottenuto un notevole passo in avanti verso l’innovazione tecnologica. Infatti, negli ultimi decenni, le tecnologie sempre più all’avanguardia e l’aumento dell’utilizzo dell’elettronica, sia in campo civile quanto in quello industriale, hanno contribuito a una riduzione dei costi dei relativi componenti; questa situazione ha permesso di utilizzare tecnologie elaborate che in passato avevano costi elevati e quindi risultavano di scarso interesse commerciale. Nel campo delle macchine elettriche tutto questo ha permesso non solo la realizzazione di azionamenti alimentati e controllati tramite inverter, in grado di garantire prestazioni nettamente migliori di quelle ottenute con i precedenti sistemi di controllo, ma anche l’avvento di una nuova tipologia di macchine con un numero di fasi diverso da quello tradizionale trifase, usualmente impiegato nella generazione e distribuzione dell’energia elettrica. Questo fatto ha destato crescente interesse per lo studio di macchine elettriche multifase. Il campo di studio delle macchine multifase è un settore relativamente nuovo ed in grande fermento, ma è già possibile affermare che le suddette macchine sono in grado di fornire prestazioni migliori di quelle trifase.
Un motore con un numero di fasi maggiore di tre presenta numerosi vantaggi:
1. la possibilità di poter dividere la potenza su più fasi, riducendo la taglia in corrente degli interruttori statici dell’inverter;
2. la maggiore affidabilità in caso di guasto di una fase;
3. la possibilità di sfruttare le armoniche di campo magnetico al traferro per ottenere migliori prestazioni in termini di coppia elettromagnetica sviluppata (riduzione dell’ampiezza e incremento della frequenza della pulsazione di coppia);
4. l’opportunità di creare azionamenti elettrici multi-motore, collegando più macchine in serie e comandandole con un unico convertitore di potenza;
5. Maggiori e più efficaci possibilità di utilizzo nelle applicazioni Sensorless.
Il presente lavoro di tesi, ha come oggetto lo studio e l’implementazione di una innovativa tecnica di controllo di tipo “sensorless”, da applicare in azionamenti ad orientamento di campo per macchine asincrone eptafase. Nel primo capitolo vengono illustrate le caratteristiche e le equazioni rappresentanti il modello della macchina asincrona eptafase. Nel secondo capitolo si mostrano il banco di prova e le caratteristiche dei vari componenti. Nel terzo capitolo sono rappresentate le tecniche di modulazione applicabili per macchine multifase. Nel quarto capitolo vengono illustrati il modello del sistema implementato in ambiente Simulink ed i risultati delle simulazioni eseguite. Nel quinto capitolo viene presentato il Code Composer Studio, il programma necessario al funzionamento del DSP. Nel sesto capitolo, sono presentati e commentati i risultati delle prove sperimentali.
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Silveira, Augusto Wohlgemuth Fleury Veloso da. "Controle de tensão na carga para motor/gerador a relutância variável de três fases." Universidade Federal de Uberlândia, 2012. https://repositorio.ufu.br/handle/123456789/14299.
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Fundação de Amparo a Pesquisa do Estado de Minas GeraisThe subject of this work is to present a switched reluctance machine (SRM) driver capable to control the machine as a motor/generator, allowing the transition between the modes of operation while the machine is running. Six load voltage control strategies developed to be applied to a switched reluctance generator was performed, being that the strategies AV2, TBV, Hi and AMV was developed in this work. A SRM simulation able to represent the machine as a motor/generator was implemented and the results were presented. The load voltage strategies showed in this work was tested through simulations and the results indicate that the strategy called AV2 was the best one, providing a better utilization of the mechanical energy from the primary source. A prototype was assembled and the experimental results showed that the machine operating as a motor/generator operate properly and all the load voltage strategies developed to switched reluctance generator kept the voltage on the load near to the reference value confirming the functionality of the strategies.
Este trabalho tem como objetivo apresentar um acionamento capaz de controlar a máquina de relutância variável (MRV) como motor e como gerador, permitindo a transição de modos de operação com a máquina girando. Seis técnicas de controle de tensão na carga da máquina operando como gerador foram implementadas, sendo que as estratégias AV2, TBV, Hi e AMV foram desenvolvidas neste trabalho. Uma simulação da MRV capaz de representar a operação da máquina como motor/gerador foi desenvolvida e os resultados foram apresentados. As estratégias de controle de tensão na carga foram testadas através de simulação. Comparações entre as mesmas demonstraram que a estratégia AV2 é a que proporciona maior geração de energia elétrica, demonstrando a importância de se adicionar uma etapa de roda livre ao controle do GRV com malha fechada de tensão na carga. Um protótipo foi construído no laboratório utilizando DSP e resultados experimentais da máquina operando como motor/gerador, assim como resultados do GRV controlado pelas estratégias de controle de tensão na carga foram apresentados e discutidos.
Doutor em Ciências
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Sarivisetti, Gayathri. "Design and Optimization of Components in a 45nm CMOS Phase Locked Loop." Thesis, University of North Texas, 2006. https://digital.library.unt.edu/ark:/67531/metadc5397/.
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A novel scheme of optimizing the individual components of a phase locked loop (PLL) which is used for stable clock generation and synchronization of signals is considered in this work. Verilog-A is used for the high level system design of the main components of the PLL, followed by the individual component wise optimization. The design of experiments (DOE) approach to optimize the analog, 45nm voltage controlled oscillator (VCO) is presented. Also a mixed signal analysis using the analog and digital Verilog behavior of components is studied. Overall a high level system design of a PLL, a systematic optimization of each of its components, and an analog and mixed signal behavioral design approach have been implemented using cadence custom IC design tools.
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Rezende, Fabian Barbosa de. "Controlador digital de alto desempenho para um inversor senoidal com realimentação pela corrente do capacitor de saída usando um processador digital de sinais de 16 bits e ponto fixo." Universidade Federal de Uberlândia, 2008. https://repositorio.ufu.br/handle/123456789/14429.
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This work presents a high performance digital controller of a single
phase PWM sinusoidal inverter, using a 16-bits fixed point DSP. This converter is
typically used in UPS (Uninterruptible Power Supplies), where a sinusoidal output
voltage is desired. The digital controller has an internal filter capacitor current loop,
and an external output voltage loop. Experimental results showing the performance
of the system under linear and non-linear loads are presented, where a low total
harmonic distortion (THD) is achieved.Este trabalho apresenta um controlador digital de alto desempenho para um inversor PWM senoidal monofásico, usando um processador digital de sinais de 16 bits, ponto fixo. Esta topologia é tipicamente utilizada em sistemas UPS ( Uninterruptible Power Supplies ), onde uma tensão de saída senoidal é desejada. O controlador digital proposto consiste numa malha interna de realimentação da corrente do capacitor do filtro de saída, uma malha externa de realimentação da tensão de saída. Resultados experimentais mostrando o desempenho do sistema para cargas lineares e não-lineares são apresentados, onde uma baixa distorção harmônica total (THD) é observada, e é demonstrada uma elevada rigidez dinâmica da tensão de saída para transientes de carga.
Mestre em Ciências
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Marques, Fernando Nunes. "Inversor flyback a quatro transistores controlado por um dispositivo FPGA para obter MPPT em sistemas fotovoltaicos." Universidade Federal de Uberlândia, 2008. https://repositorio.ufu.br/handle/123456789/14389.
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Conselho Nacional de Desenvolvimento Científico e TecnológicoElectrical energy generation with photovoltaic cells is being more utilized. Not only on large scale systems, but also in small ones connected to the grid. Parallel operating with the great generators from power companies, in a non-centralized way of operation, supplying low power, installed in houses, commerce establishments, industry, with the goal to minimize the loss in transmission, for being installed at the same consumption place. This work presents a FPGA device controller of a four transistor flyback inverter for maximum power point in photovoltaic systems. Despite this system has low power it contributes to search simple and low cost alternatives for generating of electrical power in a decentralized manner, which does not use battery banks connected parallel to network of energy near to consumers.
Geração de energia elétrica a partir de painéis fotovoltaicos vem sendo cada vez mais utilizada, não somente em sistemas fotovoltaicos de grande porte, como também em pequenos sistemas conectados a rede CA. Interligada paralelamente aos grandes geradores da concessionária de energia de forma descentralizada em sistemas de pequeno porte e baixas potências, instalados em residências, estabelecimentos comerciais, indústria, com o objetivo de minimizar perdas por transmissão por estarem instalados nos próprios locais. Este trabalho apresenta um controle num dispositivo FPGA de um inversor flyback a quatro transistores para máxima potência em sistemas fotovoltaicos. Apesar da baixa potência este contribui para a busca de alternativas simples e de baixo custo para geração de energia elétrica de forma descentralizada, não utilizando bancos de bateria conectados paralelamente a rede de energia próxima aos consumidores.
Mestre em Ciências
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Costa, Carlos Roberto do Nascimento. "Autenticação biometrica via teclado numerico baseada na dinamica da digitação : experimentos e resultados." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/261779.
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Orientadores: João Baptista Tadanobu Yabu-uti, Lee Luan LingDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
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Resumo: Este trabalho apresenta uma nova abordagem para autenticação biométrica de usuários baseada em seu ritmo de digitação em teclados numéricos. A metodologia proposta é de baixo custo, nãointrusiva e pode ser aplicada tanto a um mecanismo de login em controle de acesso a áreas restritas como na melhoria do nível de segurança em transações bancárias. Inicialmente, o usuário indica a conta a ser acessada por meio de uma cadeia de caracteres digitada que é monitorada em tempo real pelo sistema. Simultaneamente, são capturados os tempos de pressionamento e soltura das teclas. Quatro características são extraídas do sinal: Código ASCII (American Standard Code for lnformation lnterchange) da tecla, duas latências e uma duração associada com a tecla. Alguns experimentos foram feitos usando amostras reais de usuários autênticos e impostores e um classificador de padrões baseado na estimação da máxima verossimilhança. Alguns aspectos experimentais foram analisados para verificar os seus impactos nos resultados. Estes aspectos são as características extraídas do sinal, a informação alvo, o conjunto de treinamento usado na obtenção dos modelos dos usuários, a precisão do tempo de captura das entradas, o mecanismo de adaptação do modelo e, finalmente, a técnica de obtenção do limiar ótimo para cada usuário. Esta nova abordagem traz melhorias ao processo de autenticação pois permite que a senha não seja mais segredo, assim como oferece uma opção para autenticação biométrica em dispositivos móveis, como celulares
Abstract: This work presents a new approach for biometric user authentication based on keystroke dynamics in numerical keyboards. The methodology proposed is low cost, unintrusive and could be applied in a login mechanism of access control to restricted area andJor to improve the security level in Automatic Teller Machines (ATM). Initially, the user indicates the account to be accessed by typing the target string that is monitored in real time by the system. Simultaneously, the times of key pressed and key released are captured. Four features are extracted from this input: The key ASCII code, two associated latencies and key durations, and some experiments using samples for genuines and impostors users were performed using a pattern classification technique based on the maximum likelihood estimation. Some experimental aspects had been analyzed to verify its impacts in the results. These aspects are the sets of features extracted from the signal, the set of training samples used to obtain the models, the time precisions where captures the inputs, the adaptation mechanism of the model and, finally, the technique to attainment of the excellent threshold for each user. This new approach brings improvements to the process of user authentication since it allows the password not to be a secret anymore, as well as it allows to include biometric authentication in mobile devices, such as cell phones
Mestrado
Telecomunicações e Telemática
Mestre em Engenharia Elétrica
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Annunziato, Rafael Christiano. "Projeto e implementação de método para conexão paralela de UPSs com compartilhamento de potência." Universidade Tecnológica Federal do Paraná, 2012. http://repositorio.utfpr.edu.br/jspui/handle/1/312.
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Este trabalho apresenta o projeto e a implementação prática de um método completo para ser utilizado na conexão de UPSs monofásicos em paralelo. Existe um algoritmo que executa o droop de fase/frequência, e um novo método que trabalha com e sem comunicação de dados entre os inversores. Quando a comunicação está ativa, um novo algoritmo é utilizado, inserindo um resistência virtual variável, junto com o compartilhamento de potência ativa, obtendo um baixo valor de THD (Total Harmonic Distortion) na tensão de saída e bom compartilhamento de potência. Quando a comunicação de dados não funciona, uma resistência virtual constante é inserida, aumentando a THD de saída com carga não-linear, mas ainda proporcionando um bom compartilhamento de potência ativa. A vantagem é poder obter um bom desempenho quando a comunicação de dados está operando, mas, no caso de sua falha, o sistema ainda funciona, proporcionando maior confiabilidade. A implementação possui um algoritmo de emulação de carga eletrônica, com o propósito de executar testes de produção, baseado no mesmo algoritmo de paralelismo, apenas mudando algumas variáveis.This work presents the design and experimental implementation of a complete paralleling method to be used for parallel single-phase UPSs connection. There is a algorithm that performs a phase/frequency droop, and a new method to work with or without data communication among the inverters. When communication is working, a new algorithm is used, inserting a variable virtual resistance in the output, along with active power sharing, obtaining a low output voltage THD (Total Harmonic Distortion) value and good power sharing. Without communication a constant virtual resistance is inserted, increasing the output THD with non-linear load, but still allowing a good active power sharing. The advantage is to obtain a good performance operation with communication, but, in case of communication failure, the system still works providing more reliability. The implementation have a electronic load emulation algorithm, with purpose to execute factory tests, based in the same parallelism algorithm, just changing some variables.
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Oliveira, Alex Venancio de. "Projeto e desenvolvimento de um condicionador de sinais com saida 4-20mA com isolamento optico." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/259315.
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Orientador: Jose Antonio Siqueira DiasDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
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Resumo: O presente trabalho tem por objetivo o projeto, desenvolvimento e montagem de um Condicionador de Sinais de baixo custo, versátil e com recursos básicos comparáveis aos equipamentos semelhantes existentes no mercado nacional, que são na sua grande maioria importados. O equipamento faz a conversão, filtragem, isolação e condicionamento de pequenos sinais de controle provenientes de diversos tipos de sensores e transdutores, comuns em ambiente industrial, utilizando uma tecnologia bem consolidada de transporte de sinais em malhas de controle industriais: o transporte no modo corrente de 4-20mA. Esta tecnologia, mesmo frente à novos desenvolvimentos digitais na área de controle e transmissão de sinais em ambiente industrial, resiste como alternativa econômica e de ótimos resultados, mesmo em ambientes extremamente agressivos, com altos níveis de interferência
Abstract: In this work it is presented the design, development and implementation of a low cost and versatile signal conditioner which is similar to the products available in the Brazilian market, most of them imported. The developed equipment performs the conversion, filtering, isolation and conditioning of small control signals from various types of sensors and transducers commonly used in industrial environments, by using a mature technology of signal transport in industrial control loops: current mode of 4-20mA. This technology, despite of new digital developments in the area of control and signal transmission in industrial environments, resists as an economic alternative with excellent results, especially in extremely aggressive environments with high levels of interference
Mestrado
Eletrônica, Microeletrônica e Optoeletrônica
Mestre em Engenharia Elétrica
29
Klecl, Martin. "Digitální elektronický hudební syntezátor s analogovým řízením pro platformu Eurorack." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2019. http://www.nusl.cz/ntk/nusl-399607.
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This work explores the topic of digital audio signal processing for modular synthesizers and the design of digital oscillator for modular standard known as Eurorack. Introduction of the theoretical part is dedicated to basic terms and blocks used in modular synthesizers. The thesis also characterizes and presents the methods of sound synthesis. The second part of the theory concerns analog and digital signal conversion made by digital signal processors DSP, focusing on ARM with focus on ARM architecture. The practical part of the thesis concerns design and construction of the digital oscillator which generates periodic waveforms without aliasing distortion. The oscillator also allows several types of modulations and waveforming and the module has several inputs for connecting control voltages or external audio signals.
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Resende, Guilherme Pereira de. "Equipamento de biofeedback para tratamento fisioterápico em pacientes portadores de pé equino." Universidade Tecnológica Federal do Paraná, 2014. http://repositorio.utfpr.edu.br/jspui/handle/1/1206.
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Este trabalho descreve o desenvolvimento de um equipamento de biofeedback para utilização por fisioterapeutas no tratamento de pacientes portadores de pé equino. Normalmente o pé equino está relacionado a uma das sequelas de um acidente vascular cerebral e é caracterizado pela dificuldade no controle motor do membro afetado, muitas vezes apresentando limitações relacionadas à sensibilidade e dificuldade em manter o calcanhar em contato com o solo durante a marcha. O equipamento foi construído com base no conceito de biofeedback, apresentando ao paciente, em tempo real, informações relacionadas à intensidade de força aplicada nos membros inferiores. O equipamento é composto de sensores de força flexíveis alojados em um par de sandálias, ligados a um circuito eletrônico microcontrolado. Todo o processamento é realizado por um MSP430, e a comunicação é feita por sinais de rádio através de um módulo CC1101. Os dados são apresentados em uma interface de software em um computador portátil a uma taxa de atualização de 20 Hz. O software possui diversas funcionalidades para atender tanto as necessidades dos fisioterapeutas quanto dos pacientes. Do ponto de vista do paciente, a interface apresenta um visual simples e objetivo, facilitando o entendimento das variações de força, apresentadas na forma de barras verticais. Foram utilizados também recursos visuais e sonoros para enfatizar aos pacientes quando os objetivos estipulados para seu tratamento foram atingidos. Outras funcionalidades foram desenvolvidas para que os fisioterapeutas tenham a opção de customizar a interface de biofeedback de acordo com a necessidade de cada paciente, além de possibilitar o armazenamento de todos os dados dos sensores para análises posteriores. O protótipo foi testado em 20 voluntários durante 10 sessões de fisioterapia, sendo 10 portadores da disfunção pé equino e outros 10 normais para compor um grupo de controle. O objetivo principal do protocolo fisioterapêutico foi melhorar a manutenção do contato como o solo no calcanhar afetado. Os valores de pressão no calcanhar afetado de todas as das sessões foram adquiridos a uma taxa de 20 Hz, armazenados e analisados segundo as seguintes métricas: média, máximos e somas acumuladas. Também foi realizada a avaliação de Berg para todos os voluntários. Os resultados demonstraram que, para as métricas analisadas e também para a avaliação de Berg, houve uma evolução em todos os pacientes.This work describes the development of a biofeedback device to be used by physiotherapists during treatment of patients with equinus foot. Normally the equinus foot is related to one of the sequelae of a stroke and is characterized by difficulty in motor control of the affected limb, often resulting in limitations on sensitivity. The equipment was built on the concept of biofeedback, presenting to the patient, in real time, information related to the intensity of the forces applied to the lower limbs. The equipment consists of flexible force sensors accommodated in a pair of sandals, connected to a microcontrolled electronic circuit. The whole processing is performed by an MSP430, and the communication is done by radio signals through a CC1101 module. The data is presented in a software interface on a laptop computer at a refresh rate of 20 Hz. The software has many features to meet both the needs of physiotherapists as patients. From the point of view of patients, the interface was designed to be simple and objective, facilitating the understanding of force variations that change dynamically at the exact moment when the sensors are pressed. Visual signs and sound were also used to emphasize to patients when the goals established for their treatment has been reached. Other features were developed specifically for physicaltherapists, giving them the option to customize the biofeedback interface according to the needs of each patient, and also allowing the storage of all data transferred by the sensors for further analysis. A prototype was developed and tested on 20 volunteers over 10 sessions of physical therapy, 10 patients with equinus foot dysfunction, and 10 normal people to compose a control group. At the end of the treatment period, the data were analyzed by session, according to the average forces, the maximum values reached, the accumulated sums and Berg assessments. The results revealed an evolution in all patients, some of them in a greater degree and others in lower degree of progress.
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Gomes, Luciano Coutinho. "Acionamento vetorial de motores de indução trifásicos com enfraque-cimento de campo e maximização do conjugado por ampère." Universidade Federal de Uberlândia, 2008. https://repositorio.ufu.br/handle/123456789/14250.
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Fundação de Amparo a Pesquisa do Estado de Minas GeraisThis work investigates the operation of three phase induction motors in field weakening and high speed regions. Maximum torque per ampère is imposed by using an indirect vector control strategy. Mathematical models that accounts for magnetic saturation is used for simulations and adjustment of controllers used in control algorithm. The driving structure is characterized by the use of VSI static converter with sinusoidal PWM switching strategy and a vector control technique based on orthogonal components. Investigations resulted in the development of a digital simulation using discrete models that turned out generic and reliable, and an experimental system using a low cost fixed point DSP platform. Simulated and experimental results are included and shown the robustness and efficiency of the proposed control system under different operating conditions.
O presente trabalho tem como objetivo estudar a operação de motores de indução trifásicos em regime de enfraquecimento de campo e altas velocidades, com maximização do conjugado por ampère, através de um sistema de acionamento vetorial. Para tanto, foi utilizado uma modelagem matemática completa, por fase, que emprega o conceito de função harmônica magnética e considera as componentes, fundamental e de terceiro harmônico do fluxo de entreferro. A estrutura de acionamento caracteriza-se pela utilização de um inversor de tensão PWM senoidal e da técnica de controle vetorial, esta baseada em componentes ortogonais. A evolução do trabalho resultou no desenvolvimento de uma plataforma de simulação computacional baseada em modelos discretos que é bastante genérica e confiável, e um sistema experimental utilizando um processador digital de sinais de baixo custo com aritmética de ponto fixo. Os resultados de simulação e experimentais que avaliam a eficiência do sistema de controle proposto sob diversas condições de operação e efeitos de dessintonia são apresentados e apontam para robustez do método.
Doutor em Ciências
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Huang, Min-Shien, and 黃敏賢. "Aircraft Starter/Generator Controller Design Using Digital Signal Processor." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/91478139239027540949.
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碩士國立中興大學
電機工程學系
86
AbstractThis thesis aims to develop q controller for a aircraft starter/generatorusing a Digital Signal Processor (DSP)TMS320C25 Texas Instrument.A DSPvoltage regulator is prototyprd and verified in this work. A PWM inverteris emploted for driving the generator field. In addition to a convventionalscheme for PWM signal generator , we propose a new approach using the variable structure control( vsc).There are several factors, which can degrade the system performance .To cope with these factors, we use VSC for a presise voltage regulation. The switching nature of the PWM drive alsomakes VSC a reasonable choice for control law design . The experimental results shows that VSC has much betterperformance than a continuous PI controller. Robustness tests against rotatingspeed and loading current variable also give supportive results.
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巫書麟. "An Application of Digital Signal Processor to A PID Positioning Controller." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/69373117850663947813.
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碩士中原大學
機械工程學系
85
In this dissertation, the PD and PID control theory is used to design the digital controller and also take the digital signal processor (DSP) which has high-speed calculating ability as the major part for calculating. Then applied them to perform the positioning control system. First, we simulate the system response by computer, then applied the results from simulation to the real system. The structure design of the positioning control system is using the digital signal processing on the control board to go with the 8255 IC for the output of pulse wave to the servo motor driver. The AC servo motor drives ball screw and gets the position pulse signal of the system from the linear scale to feed back to the encoder interface of the control board. Then we can transmit the data back to the digital signal processor and also applies the control theory program that is loaded to the digital signal processor at the beginning to calculate the output of the next control command. During the operation stage, all signals are digitized, so it can say to be a full digitized control system. Finally, in this dissertation we base on the single axis positioning system for simulation and experiments also the two axes cartesian coordinate XY table for experiments.
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Xu, Hong-Wei, and 許宏維. "The Implementation of Digital Signal Processor on A Multi-Axis Controller." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/56390910837133424414.
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碩士中原大學
機械工程研究所
86
In this thesis, the implementation of digital signal processor (DSP) on the multi-axis control application is investigated. Two major parts are included in the multi-axis control system; one is the interpolator which calculates the reference command for the trajectory planning, and the other is the servo controller that compensates the errors. The DSP possesses the capability of high-speed computation which is used to efficiently compute the complicated control algorithm. While collaborating with other peripherals, it practically connects to the real plant so that the design of the multi-axis interpolator and controller is completed.For verifying the DSP algorithm and the relative circuitry, the X-Y-Z table driven by the AC servomotor and the Stewart Platform based manipulator (SPBM) driven by the hydraulic systems are examined by computer simulation and experiment. The performance of the entire system is also tested and compared with the simulation results for both systems. Finally, the conceptualdesign of real-time multi-task function is proposed for the purpose of multi-axes synchronization.
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Chang, Hung-Wei, and 張弘為. "Implementation of Servo Motor Control Based on Digital Signal Controller dsPIC30F4011." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/4q6kp4.
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碩士國立虎尾科技大學
電機工程研究所
103
Based on the digital signal controller dsPIC30F4011, which is generated by Microchip company, the thesis realizes servo motor position control. This implemented control is different from conventional programmable logic controller (PLC) servo motor control, which has the restriction that it needs human–machine interaction (HMI) and PLC sequence control, , axis control card and servo motor driver to work. Besides, every useable PLC module has to be from the same manufacturer. The proposed servo motor control can directly transfer the control instruction via HMI to digital signal controller. The digital signal controller can conduct servo position control program inside, and transfer sinusoidal pulse width modulation signals to drive six power switches of the three-phase inverter. The three-phase voltage will be generated from the inverter, and it can be used to control the servo motor. In other words, PLC and axis control card are replaced by a digital signal controller. As to simplify servo motor position control using digital signal controller, the thesis adopts vector control strategy with using direct and inverse Park transform, and direct and inverse Clarke transform to achieve d-q axis transformation so that servo motor can operate in the maximum torque during the whole process. The optical encoder of servo motor generates three feedback signals, ‘A’, ‘B’ and ‘Z’. The ‘Z’ signal is activated as an original point position signal of digital signal controller program, and is also used as the counter of servo motor rotate. The ‘A’ signal controls the counter register of counter motor inside of dsPIC30F4011 to achieve the precision position motor control. Meanwhile, by transforming the value in register to velocity feedback signal and calculating it with command velocity signal, we can realize close loop velocity control, which let the motor being able to rotate in steady speed. In this thesis, We use digital signal controller dsPIC30F4011 to realize servo motor position control system, and the system contains steady velocity control and precise position control toward the servo motor. Comparing to the conventional PLC position control system, the proposed method in thesis can highly decrease the cost and shrink the volume. Furthermore, the restriction of using the same brand devices no longer exist, which means we can perform servo motor position control according to the characteristic of the motors.
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Alico, Jurgen. "Multiphase Optimal Response Mixed-signal Current Program Mode Controller." Thesis, 2009. http://hdl.handle.net/1807/18135.
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The primary focus of this thesis is to present a simple and practical implementation of an optimal-time response controller for multiphase interleaved dc-dc SMPS. This novel solution enables equal current sharing between phases not only in steady-state, but also during load transients, as well as bump-less transition between those two states. A digital voltage loop and multiple analog peak current programmed mode current loops are combined to implement a capacitor charge balance control algorithm with fairly simple hardware. This algorithm provides recovery from a disturbance in a single on-off switching action, which is performed in virtually the fastest possible time.
The hybrid interface between the loops is provided through a structure combining a sample-and-hold circuit and a relatively slow successive-approximation DAC that provides control signals for all the loops in the system. Furthermore, for operation under light load conditions, the controller automatically switches into simply implemented pulse-frequency mode of operation.
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Chen, Chang-Chih, and 陳昶志. "Study and Implementation of a Digital Signal Controller dsPIC30F4011 for Vehicle-used Inverter." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/45791013794598043820.
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碩士崑山科技大學
電機工程研究所
98
With the advance in technology, digital controllers are increasingly being used especia1ly in complex systems, including automobile electronic systems. Therefore, this thesis develops a DSP based design and implementation of an isolated inverter powered from a low dc source such as battery of vehicles. The main structure is consists of a push-pull converter and a single-phase full-bridge inverter. The front-stage push-pull converter boosts the lead-acid batteries voltage from 12V to 180V. The post-stage single-phase full-bridge inverter converts the 180V DC input voltage to an AC output voltage at 110 Vrms/60 Hz and then, the AC source can be used to supply the electrical loads at vehicles. This thesis introduces the operational principles of its push-pull converter and single-phase full-bridge inverter. The small signal models of both converters are also derived and the parameters of the PI controller are evaluated according to the specifications. To regulate the inverter output voltage, a digital signal controller dsPIC30F4011 is selected to implement the digital controller algorithms. A simple absolute value average method is used to feedback the inverter output voltage without delay time. By using the feedback control, the inverter output voltage is regulated under load and line variations. In addition, sinusoidal pulse-width-modulation (SPWM) with low switching losses unipolar voltage switching method is introduced in single-phase full-bridge inverter, to reduce the switching loss caused by the switches and improve the efficiency. Finally, a 100W digital inverter system is implemented to verify the functionalities of the proposed designs.
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Chiang, Hung-chan, and 江鴻展. "The Speed Control of Three-Phase Induction Motor Using Digital Signal Controller dsPIC30F4011." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/335xk9.
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碩士崑山科技大學
電機工程研究所
96
This thesis applies digital signal controller (DSC) dsPIC30F4011 to the speed control of three-phase induction motor. The speed control method of three-phase induction motor comprises vector control and scalar control. The former has better control performance. But it needs complicated mathematical model to implement the control strategies. Therefore, the scalar control has come into being another option for system designer in which the control system is not severely requested to be very stable. The digital control method has been widely used for induction motor at present. Based on DSC structure, this thesis applies V/f control, PID control, and Fuzzy control methods to the speed control of induction motor. The V/f control has the advantages of simple structure and easy implementation. In comparison with the other scalar control methods, the PID control has superior performances on parameters adjustment and control stability. The fuzzy control provides simpler control method than the other methods in which the system has highly non-linear characteristic or the differential equation can not be easily obtained. To verify the feasibility of the proposed method, this thesis employs one small induction motor (1/2 Hp) to fulfill the experiments. For assessing the control performance of the above methods, the step response and load variation experiments are studied based on different speed commands. Furthermore, this thesis also uses Visual Basic (VB) software to provide the personification of man-machine interface that the users can further monitor the operation state of induction motor.
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Ho, Yen-Cheng, and 何彥成. "Modified PI Speed Controller for a Brushless DC Motor Based on Digital Signal Processor." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/qwsqwr.
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碩士中原大學
機械工程研究所
103
In the past few years, the cars whose engines replaced by electric engines are gradually concerned, because of the shortage of petroleum. Brushless DC motors have high efficiency, high torque, high reaction speed, simple maintenance and easy control because they don’t have copper loss of rotor and having smaller moment of inertia. They are used in daily life and automatic production factory. The purpose of this paper is to use Digital Signal Processor (dsPIC33FJ256MC710) manufactured by Microchip Technology Inc to be a controller. And use modified Proportional- Integral Control to implement the speed control of a Brushless DC Motor. On a circumstance that grasp transfer function and parameters, using MATLAB-Simulink simulates the control of motors. The results of simulation are a basis of experiment. All the outcome from experiment are used to make response plot of speed. Finally, by means of comparison of response plot of traditional PI controllers I can make sure that the modified PI controllers are helpful to make it more stable and spend less time being a stable condition. At the meantime, the modified PI controllers can overcome the steady-state error more easily. And this make motors more precise and more stable in the speed control.
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Perelli, Fabio. "Guidance control of an automated vehicle using CCD camera vision and parallel digital signal processing (DSP) controller." Thesis, 1995. http://spectrum.library.concordia.ca/3387/1/MM10885.pdf.
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Yeah, Ping-Cheng, and 葉秉承. "Design and Implementation of Digitalized Electronic Control System of Solar Vehicle Based on a Digital Signal Controller." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/43088235734033968216.
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碩士清雲科技大學
電機工程所
98
Abstract The purpose of this thesis is to design and implement a full-digitalized control system is based on digital signal controller (DSC) for a solar-powered vehicle, which is driven by a brushless dc motor (BLDCM) drive. The hardware of man-machine interface consists of a TFT LCD 3.5” touch panel, RS-485 communication interface with BLDCM driver, and the 16-bit low power microcontroller. In order to improve the performance of the speed control, a proportional-integral controller is applied for the control system. The protective circuit for solar vehicle, which includes overvoltage, overcurrent and power module temperature, can provide a secure operation of the motor drive. Experimental results are shown that that electronic control system of the solar powered vehicle can provide the user friendly interface, safe operation environment, low cost and the high-efficiency.
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Liu, Bingyan, and 劉秉彥. "A Magnetron Power Supply Using Digital Signal Controllers and LLC Tanks." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/46626628479434083150.
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碩士明志科技大學
機電工程研究所
101
This thesis develops a half-bridge magnetron switching power supply, which uses a digital signal controller to control the output of an LLC resonant tank. The rating of the used continuous-wave magnetron is 4kV/1kW. The oscillation frequency of the magnetron is around 2460MHz. The half-bridge switching circuit cooperated with a high-frequency transformer steps up the input ac 220V to ac 2kV and then the secondary full-wave rectifier doubles the secondary voltage to 4kV. To regulate the power of the magnetron, the switching frequency of the half-bridge circuit is changed from 25 kHz to 32 kHz. The digital signal controller, Microchip dsPIC30F4011, calculates and controls the output power with detected output dc voltage and current values.
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Chan, Cheng-Kai, and 詹程凱. "Intelligent Adaptive Motion Control for Ball Robots Using Digital Signal Controllers." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/6gd84z.
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博士國立中興大學
電機工程學系所
101
This dissertation presents intelligent adaptive controllers using recurrent-interval-type-II-fuzzy-neural-networks (RIT2FNN) and their hardware implementations for station keeping, position control and trajectory tracking of two kinds of ball robots, ballbot and ball-riding robot. For the purpose of achieving the control goals for each robotic system, nonlinear model of the robotic system with parameter variations modeling uncertainties and other non-linear characteristics are decomposed into nominal and unmodeling parts, two RIT2FNN based intelligent adaptive controllers are proposed by using backstepping techniques and hierarchical aggregated sliding-model control approaches, and their performance and robustness properties are well investigated. The two RIT2FNN-based controllers fall into two categories: nonlinear control augmented with the RIT2FNN, and direct adaptive RIT2FNN-based control. Simulations and experimental results are conducted on the experimental ballbot and ball-riding robots, which are respectively equipped with a new driving mechanism and a control system; the control system is composed of a digital signal controllers, one tilt sensor and one rate gyro with interfacing circuits, and DC servomotors driving modules. The comparative studies via simulations show that the proposed controllers outperform other existing controllers. Experimental results exemplify the performance and applicability of the proposed controllers together with the built robotic systems.
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Yeh, Po-Yi, and 葉柏毅. "Modeling and Design of Digital-Controlled Converters Based on Small Signal Model." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/jb2f56.
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博士國立臺北科技大學
電機工程系博士班
102
The major purpose of this dissertation is to establish a DSP-based controller to perform digital-controlled power converter for improving its static and dynamic performance. First, a small-signal linearized model of a switching power converter is built by perturbing and linearizing the average model at a quiescent operating point. Based on the linear model, the controller design is yielded using Bode plot. Then the designed controller in S-domain is mapped to Z-domain by bilinear transformation to implement the digital control of the established converters. Moreover, in order to verify the effectiveness of the proposed digital control power converter, a fast response of three-phase bidirectional AC-DC converter, a single-phase bidirectional AC-DC converter with fast dynamic response, and a single-phase transformer-based DC-AC inverter are implemented to realize and verify the proposed methods. The three-phase bidirectional AC-DC converter is applied to electrical vehicle battery testing that has fast dynamic response. To analyze the influence of transient load, a small signal model of load disturbance is derived under two different capacitors. A transient load compensator(TLC) is proposed to reduce the output voltage fluctuation and thereby avoiding potential current trip at fast load change. A single-phase bidirectional AC-DC converter is applied to electrical scooter battery testing with fast current response. Based on fast current control can simulate the on-road power flow by controlling the current of battery in laboratory. Therefore, design of current controller are based on small signal modeling, measurement AC impedance and modeling of battery. A design procedure of the controller with 3 kHz bandwidth of current loop and 120Hz voltage ripple disturbance rejection are developed to mitigate the current ripple of battery under charging mode. Single-phase transformer-based DC- AC inverter is implemented by a full-bridge circuit which equipped with output isolation line-frequency transformer and transformer output voltage feedback. A high dynamic response DC-AC inverter is connected to output of the line-frequency transformer. For the nonlinear loads, the designed DC-AC inverter provides transient current to nonlinear load to reduce AC voltage harmonics to meet the regulations. Therefore, the redundant capacity, cost, size and weight of line frequency transformer can be significantly reduced. A detailed description of the control strategy and small signal analysis of the proposed converter is described. To realize the digital power control, all the controlling strategies are written by software. The simulation and experimental results demonstrate the feasibility and effectiveness of the proposed control strategies and small-signal model.
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Chen, Pai-Yen, and 陳百彥. "Design and Implementation of Vector-Controlled Induction Motor Drives using Digital Signal Processor." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/27481446970790653391.
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碩士國立臺北科技大學
電力電子產業研發碩士專班
100
The objective of this thesis is to design and implement the vector controlled induction motor drives. The design of the PI controller parameters for rotor-flux oriented control. SIMULINK&;reg; is used for theoretical analysis, simulation and design. Renesas SH-7286 series micro control unit is used for software development. The experimental system includs: micro control unit control board, power stage driver board. Experimental results verified the designed and implemented vector controlled induction motor drives.
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Jun-HuaChiang and 蔣君華. "New Digital Nonlinear-Carrier Power Factor Correction and Mixed-Signal Maximum Power Point Tracking Controllers for Renewable Power System Applications." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/67171811029521932980.
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博士國立成功大學
電機工程學系
104
A new power factor correction (PFC) application and implementation for a small wind power system and a mixed-signal maximum power point tracking (MPPT) integrated circuit (IC) controller for a micro photovoltaic (PV) power system are proposed in this dissertation. An algorithm for implementing the nonlinear-carrier (NLC) control method for a single-phase PFC rectifier without an input voltage sensing circuit, an error amplifier in the current shaping loop, or other external control components. Unity power factor and low harmonic distortion are achieved by adopting NLC control with a variable slope ramp. This ramp is created through a slope comparison without any dividers. The proposed method not only achieves a high power factor, but also efficiently simplifies the complexity of IC realization. A single-phase boost rectifier and a small wind power system are implemented to verify the performance of the proposed PFC control. The test platforms are 400 W single-phase boost rectifier and 1100 W small wind power system respectively. A mixed-signal MPPT IC controller implemented with a mixed-signal multiplier is applied for a PV power system. The mixed-signal MPPT IC controller, which can be easily implemented on a low-cost single-chip IC, is based on the perturbation and observation method. The mixed-signal multiplier combines features of analog control with digital control. Compared with digital MPPT controllers, up to 10-bit high resolution analog to digital converters are significantly reduced to simplify the hardware complexity of the IC realization. Compared with analog MPPT controllers, which have a narrow linearity range of low supply voltage, the proposed controller has high linearity range of low supply voltage and precise calculations for MPPT to extend the input voltage control range of the PV power system. The measurement results include single chip test and a 200 W PV power system.
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Balssubramanian, Suresh. "Application Of Alpha Power Law Models To The PLL Design Methodology Using Behavioral Models." Thesis, 2004. http://hdl.handle.net/2005/1127.
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