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Kathi, Lokesh. "Small-Signal Analysis of Non-isolated Cuk DC-DC Converter." Wright State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=wright1598899911848989.
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Ayhan, Mustafa Tufan. "Design And Implementation Of Coupled Inductor Cuk Converter Operating In Continuous Conduction Mode." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613927/index.pdf.
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The study involves the following stages: First, coupled-inductor and integrated magnetic structure used in Cuk converter circuit topologies are analyzed and the necessary information about these elements in circuit design is gathered. Also, benefits of using these magnetic elements are presented. Secondlysteady-state model, dynamic model and transfer functions of coupled-inductor Cuk converter topology are obtained via state-space averaging method. Third stage deals with determining the design criteria to be fulfilled by the implemented circuit. The selection of the circuit components and the design of the coupled-inductor providing ripple-free input current waveform are performed at this stage. Fourth stage introduces the experimental results of the implemented circuit operating in open loop mode. Besides, the controller design is carried out and the closed loop performance of the implemented circuit is presented in this stage.
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Gunaydin, Zekiye. "Analysis And Design Of A Cuk Switching Regulator." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610606/index.pdf.
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This theses analyzes Cuk converter, that is one of the dc to dc switching converters. For continuous inductor current mode and discontinuous inductor current mode, stedy state operation is analysied. Characteristic parameters are determined. Through State Space Averge Models, Small Signal Models are obtained. Parasitic Resistance effects on steady state and small signal models are determined. Efficency of the switching converter is derived. Open loop transfer functions for continous and discontinuous inductor curret mode are obtained. Parmeters for small signal behaviour is determined and stability is analysied. Parasitic resistance effects on transfer functions is determined. Therotecial analysis are verified with a simulations of designed converter.
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Pacheco, Juliano de Oliveira. "AC-DC Cuk converter based on three state switching cell with power factor correction applied in battery charger." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=14579.
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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel SuperiorThis work presents the study and implementation of an ac-dc Ćuk converter based on the three state switching cells applied in charger stations for electric vehicles. This converter has, as main characteristics, reduction of conducting power losses in the semiconductors, a single stage topology and current source behavior for both input and output terminals. As drawbacks, the topology presents: the voltage across the semiconductors is equal to the sum of the input and the output voltages, and a difference between the current values through the semiconductors caused by an inappropriate layout of the power prototypes or by a lack of symmetry between the control signals. The analysis of the converter is made through the qualitative and quantitative studies, beyond the analysis of the semiconductor losses which are presented as well. The current and voltage of the battery are controlled by the average current mode technique, which consist in a fast current control loop if compared with the terminals battery voltage control loop. The topology is design for 1 kW output power, 220 V in input voltage and 162 V in the output terminals (12 batteries in series connection). Experimental results for resistive load, as well batteries, are shown in order to verify the functionalities of the topology and its characteristics.
Este trabalho apresenta o estudo e desenvolvimento de um conversor ca-cc Ćuk baseado na cÃlula de comutaÃÃo trÃs estados para aplicaÃÃo em carregadores de baterias para veÃculos elÃtricos. As principais caracterÃsticas deste conversor sÃo: a reduÃÃo das perdas por conduÃÃo nos interruptores controlados, um Ãnico estÃgio de processamento de potÃncia e caracterÃstica de fonte de corrente na entrada e na saÃda. Como inconvenientes a topologia apresenta: a tensÃo sobre os semicondutores igual à soma das tensÃes de entrada e saÃda e o desequilÃbrio de corrente atravÃs dos componentes quando hà assimetria no layout da placa de potÃncia ou nos sinais de comando dos interruptores. Um estudo teÃrico à realizado atravÃs das anÃlises qualitativa e quantitativa, alÃm das anÃlises do processo de comutaÃÃo e das perdas nos componentes do conversor. Para controlar o fluxo de potÃncia da rede elÃtrica para as baterias à utilizada a estratÃgia de controle modo corrente mÃdia, sendo que, a mesma apresenta uma malha de corrente rÃpida que monitora a corrente de entrada e uma malha de tensÃo lenta que supervisiona a tensÃo sobre os terminais da bateria. Neste trabalho à realizado o projeto do carregador de baterias para aplicaÃÃo em veÃculos elÃtricos com 1 kW de potÃncia, tensÃo de entrada eficaz de 220 V e tensÃo de saÃda de 162 V, correspondente a 12 baterias conectadas em sÃrie. Um protÃtipo com as especificaÃÃes indicadas foi construÃdo e testado experimentalmente em laboratÃrio e os resultados de simulaÃÃo e experimentais obtidos sÃo utilizados para validar a anÃlise teÃrica e o projeto realizado. Foram realizados testes com carga puramente resistiva e em seguida com um banco de baterias, que comprovaram o funcionamento da topologia.
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Sayyid, Ahmed Ali. "A High efficiency high power led driver with fault tolerance and multiple led load driving using a coupled Cuk converter." Diss., University of Pretoria, 2013. http://hdl.handle.net/2263/37318.
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Lighting consumes approximately 20-25% of the energy produced worldwide. LED based lighting is rapidly becoming the preferred choice over incandescent and fluorescent based lighting. LEDs have advantages such as high efficacy, long operating lifetime and excellent lumen maintenance. Therefore, to gain benefits from LEDs for lighting purposes, they must be driven with efficient drivers which maintain high LED efficacy and long LED lifetime.
A review of existing LED drivers is done, and their advantages and drawbacks are identified. Existing fault-tolerant drivers are also reviewed. Several dimming methods and their effects on the LED efficacy and lifetime are investigated. As a result, a converter with coupled inductors, suitable as an LED driver which has high efficiency and can maintain high LED efficacy, incorporated with a high efficiency dimming method, is chosen.
For the proposed LED driver, a comprehensive analysis on the effects of coupling type and coupling coefficient on converter performance is done. This is carried out to establish the best coupled inductor structure and coupling coefficient, for the proposed LED driver. The coupled inductor obtained is used to achieve high LED efficacy and also used to eliminate the need for an output filtering capacitor. This results in a highly compact, high efficiency and low cost LED driver.
A lossless method of LED string current sensing is proposed, so that driver efficiency is not negatively impacted. The LED driver and a digital control system are designed, with the fault-tolerant feature incorporated. The LED driver and the control system are simulated and practically implemented. The results obtained show excellent LED driver performance. The fault-tolerant feature can enable the driver to operate under fault conditions, saving repair costs and down time.
Additionally, a novel digitally controlled LED driver, which can drive several independent multiple LED loads, is proposed. This novel driver is simulated and practically implemented; with the results showing excellent driver performance. The novel LED driver can simplify and reduce costs of existing LED lighting systems.Dissertation (MEng)--University of Pretoria, 2013.
gm2014
Electrical, Electronic and Computer Engineering
Unrestricted
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Nathan, Kumaran Saenthan. "A novel DC-DC converter for photovoltaic applications." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/288881.
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Growing concerns about climate change have led to the world experiencing an unprecedented push towards renewable energy. Economic drivers and government policies mean that small, distributed forms of generation, like solar photovoltaics, will play a large role in our transition to a clean energy future. In this thesis, a novel DC-DC converter known as the Coupled Inductors Combined Cuk-SEPIC' (CI-CCS) converter is explored, which is particularly attractive for these photovoltaic applications. A topological modification is investigated which provides several benefits, including increased power density, efficiency, and operational advantages for solar energy conversion. The converter, which is based on the combination of the Cuk and SEPIC converters, provides a bipolar output (i.e. both positive and negative voltages). This converter also offers both step-up and step-down capabilities with a continuous input current, and uses only a single, ground-referenced switching device. A significant enhancement to this converter is proposed: magnetic coupling of the converter's three inductors. This can substantially reduce the CI-CCS converter's input current ripple - an important benefit for maximum power point tracking (MPPT) in photovoltaic applications. The effect of this coupling is examined theoretically, and optimisations are performed - both analytically and in simulations - to inform the design of a 4 kW prototype CI-CCS converter, switched at a high frequency (100 kHz) with a silicon carbide (SiC) MOSFET. Simulation and experimental results are then presented to demonstrate the CI-CCS converter's operation and highlight the benefits of coupling its inductors. An efficiency analysis is also undertaken and its sources of losses are quantified. The converter is subsequently integrated into a domestic photovoltaic system to provide a practical demonstration of its suitability for such applications. MPPT is integrated into the CI-CCS DC-DC converter, and a combined half bridge/T-type converter is developed and paired with the CI-CCS converter to form an entirely transformerless single-phase solar energy conversion system. The combination of the CI-CCS converter's bipolar DC output with the combined half bridge/T-type converter's bipolar DC input allows grounding at both the photovoltaic panels and the AC grid's neutral point. This eliminates high frequency common mode voltages from the PV array, which in turn prevents leakage currents. The entire system can be operated in grid-connected mode - where the objective is to maximise power extracted from the photovoltaic system, and is demonstrated in stand-alone mode - where the objective is to match solar generation with the load's power demands.
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Loup, Martin. "Modely stejnosměrných tranzistorových měničů v programu Simulink." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-412975.
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The master’s thesis is focused on the creation of models of DC/DC converters and control program for input parameters and their configuration. The first part is theoretical and she is dedicated to the description of the program Matlab. The second chapter is dedicated to DC/DC converters. Their function is described there and the necessary equations for the design are derived. All of this is complemented by the calculation of line losses in semiconductor elements and the design of voltage and current regulator. The last two parts deal with the description of the created models in Simulink and control program in a graphical environment. The created program is able to edit and recalculate parameters of the converters, calculate line losses on semiconductor components, perform a model simulation or open it.
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Morais, Julio Cezar dos Santos de. "Desenvolvimento de um microinversor conectado à rede baseado na integração do conversor Cuk com uma estrutura de indutores chaveados." Universidade Tecnológica Federal do Paraná, 2017. http://repositorio.utfpr.edu.br/jspui/handle/1/2823.
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Neste trabalho é proposto o desenvolvimento de um novo microinversor de estágio único para aplicação em sistemas fotovoltaicos. A topologia apresentada é baseada na combinação do conversor Cuk com uma estrutura de indutores chaveados para obtenção de um maior ganho estático e um circuito inversor em ponte completa conectado à rede. A estrutura de indutores chaveados apresentada nesse trabalho reduz esforços de tensão e corrente nas chaves semicondutoras. Com o objetivo de facilitar o controle, a etapa CC do microinversor opera em modo de condução descontínua (DCM). Para injetar corrente senoidal com baixa distorção harmônica à rede, é aplicado às chaves semicondutoras da etapa CC uma modulação por largura de pulso senoidal (SPWM). As chaves semicondutoras do circuito inversor em ponte completa são comandadas na frequência da rede, reduzindo perdas por chaveamento. Por se tratar de uma topologia inédita, são apresentados os modos de operação e a análise matemática do conversor CC-CC Cuk com alto ganho estático. Posteriormente, são realizadas a análise teórica e a estratégia de controle do microinversor proposto. Os resultados experimentais são expostos para discutir o funcionamento da topologia proposta, através de simulações e da implementação de um protótipo de 180 W.The development of a novel single stage microinverter is proposed. The presented topology is based on the combination of the Cuk converter with a switched inductor structure to obtain a higher static gain, and a full-bridge inverter circuit. The presented switched inductor structure reduces voltage and current stresses on the power switches. In order of simplify the control, the stage CC of the microinverter operate in discontinuous conduction mode (DCM). To inject sinusoidal current with low harmonic distortion to the grid, a sinusoidal pulse width modulation (SPWM) is applied in the power switches. The switches of the full-bridge invertes are commanded in low frequency, in order to reduce switching losses. Operation modes and math analysis of the novel CC-CC converter are presented. Moreover, the math analysis and control strategy of proposed microinverter topology are exposed. Furthermore, experimental results are performed to analyze the proposed topology operation, by software simulations and implementation of a 180 W prototype.
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Wang, Mingzhen. "High-speed Low-voltage CMOS Flash Analog-to-Digital Converter for Wideband Communication System-on-a-Chip." Wright State University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=wright1189815482.
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Morais, Juliano Luiz dos Santos de. "Desenvolvimento de um conversor CC-CC de três portas parcialmente isolado baseado na integração dos conversores CUK bidirecional e LC série ressonante." Universidade Tecnológica Federal do Paraná, 2017. http://repositorio.utfpr.edu.br/jspui/handle/1/2528.
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CAPESO desenvolvimento de um conversor CC-CC de três portas é proposto neste trabalho. Através da combinação de um conversor bidirecional Ćuk e um transformador de alta frequência com um circuito retificador em ponte completa, duas portas de energia não isoladas e uma porta de energia isolada são obtidas. Um circuito LC série ressonante é empregado, resultando em comutação suave nos interruptores de potência. O conversor bidirecional Ćuk, controlado por modulação de largura de pulso (PWM) e o circuito tanque ressonante, controlado por modulação de frequência (PFM) acima da frequência de ressonância, permitem duas variáveis de controle para a topologia. Além disso, os interruptores de potência são compartilhados nas etapas de operação, reduzindo o número de componentes ativos. Regulação de suas portas é realizada para aplicações com elementos armazenadores de energia. São apresentados os modos de operação, a análise matemática e a estratégia de controle do conversor proposto. Os resultados experimentais são expostos para discutir a viabilidade da estrutura.
The development of a DC-DC three-port converter is proposed in this work. Through the combination of a bidirectional Ćuk converter and a high frequency transformer with a full-bridge rectifier circuit, two non-isolated energy ports and one isolated energy port are achieved. A LC series resonant circuit is employed, resulting in soft-switching in the power switches. The bidirectional Ćuk converter, controlled by pulse width modulation (PWM), and the tank resonant circuit, controlled by pulse frequency modulation (PFM) above the resonance frequency, allow two control variables for the topology. Furthermore, the power switches are shared for the operation of both circuits, reducing the number of active components. Port regulations are performed for applications with energy storage elements. Operation modes, math analysis and control strategy of the proposed converter are presented. Experimental results are exposed to discuss the feasibility of the structure.
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Britto, Jonas Reginaldo de. "Análise, projeto e implementação de conversores CC-CC com ampla faixa de conversão aplicados em iluminação de estado sólido." Universidade Federal de Uberlândia, 2009. https://repositorio.ufu.br/handle/123456789/14265.
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This work consists of the study, design and implementation of DC-DC converters, used in
lighting systems based on light emitting diodes (LEDs). Can be powered by an universal AC
voltage source or battery, and the current in the LEDs is controlled digitally. The main
objective is to present a proposal of new step-up/down converters topologies with full
conversion much higher than that of conventional converters. So, is initially presented an
overview of solid-state lighting (SSL). Following is presented the study on the dynamic
behavior of converters based on modeling by the method of varying state-space average,
ending with the design of a digital PI controller. This work resulted in the application for a
patent PI-0801425-6 filed with the INPI, which presents a new family of converters with full
conversion extremely wide, called cubic converters.O presente trabalho consiste do estudo, projeto e implementação de conversores CCCC, aplicados em sistemas de iluminação de estado sólido baseado em diodos emissores de luz (LEDs). Podem ser alimentados por uma fonte de tensão alternada universal ou por uma bateria sendo que a corrente nos LEDs é controlada digitalmente. O objetivo principal é apresentar uma proposta de novas topologias de conversores abaixadores/elevadores com faixa de conversão muito maior que a dos conversores convencionais. Portanto, inicialmente é apresentada uma visão geral sobre iluminação de estado sólido (SSL). Na sequência, é apresentado o estudo sobre o comportamento dinâmico dos conversores baseado na modelagem através do método de variáveis de espaço de estados médio, finalizando com o dimensionamento de um controlador PI digital. Este trabalho resultou no pedido de patente de invenção PI-0801425-6 depositado junto ao INPI, o qual apresenta uma nova família de conversores com faixa de conversão extremamente larga, denominados de conversores cúbicos.
Doutor em Ciências
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Cui, Shenghui [Verfasser], Doncker Rik W. [Akademischer Betreuer] De, and Rainer [Akademischer Betreuer] Marquardt. "Modular multilevel DC-DC converters interconnecting high-voltage and medium-voltage DC grids / Shenghui Cui ; Rik W. de Doncker, Rainer Marquardt." Aachen : Universitätsbibliothek der RWTH Aachen, 2019. http://d-nb.info/1195238002/34.
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Xia, Bo. "Analog-to-digital interface design in wireless receivers." Texas A&M University, 2004. http://hdl.handle.net/1969.1/3260.
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As one of the major building blocks in a wireless receiver, the Analog-to-Digital Interface (ADI) provides link and transition between the analog Radio Frequency (RF) frontend and the baseband Digital Signal Processing (DSP) module. The rapid development of the radio technologies raises new design challenges for the receiver ADI implementation. Requirements, such as power consumption optimization, multi-standard compatibility, fast settling capability and wide signal bandwidth capacity, are often encountered in a low voltage ADI design environment. Previous research offers ADI design schemes that emphasize individual merit. A systematic ADI design methodology is, however, not suffciently studied. In this work, the ADI design for two receiver systems are employed as research vehicles to provide solutions for different ADI design issues.
A zero-crossing demodulator ADI is designed in the 0.35µm CMOS technology for the Bluetooth receiver to provide fast settling. Architectural level modification improves the process variation and the Local Oscillation (LO) frequency offset immunity of the demodulator. A 16.2dB Signal-to-Noise Ratio (SNR) at 0.1% Bit Error Rate (BER) is achieved with less than 9mW power dissipation in the lab measurement. For ADI in the 802.11b/Bluetooth dual-mode receiver, a configurable time-interleaved pipeline Analog-to-Digital-Converter (ADC) structure is adopted to provide the required multi-standard compatibility. An online digital calibration scheme is also proposed to compensate process variation and mismatching. The prototype chip is fabricated in the 0.25µm BiCMOS technology. Experimentally, an SNR of 60dB and 64dB are obtained under the 802.11b and Bluetooth receiving modes, respectively. The power consumption of the ADI is 20.2mW under the 802.11b receiving mode and 14.8mW under the Bluetooth mode.
In this dissertation, each step of the receiver ADI design procedure, from system level optimization to the transistor level implementation and lab measurement, is illustrated in detail. The observations are carefully studied to provide insight on receiver ADI design issues. The ADI design for the Ultra-Wide Band (UWB) receiver is also studied at system level. Potential ADI structure is proposed to satisfy the wide signal bandwidth and high speed requirement for future applications.
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Kovář, Jan. "Metody pro řešení spínaných obvodů." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-233575.
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The dissertation deals with simulations of the DC-DC converters in their basic configurations (Buck, Boost, Buck-boost, Cuk, SEPIC). In the first part of the thesis derivation of transfer functions Line-to-Output (LTO) and Control-To-Output (CTO) can be found. These symbolic responses are derived for three types of basic converters (Buck, Boost, Buck-boost) using well-known average model [1]. Derived expressions are very complicated. For reduction of these expressions symbolic approximation method was used, however the generality is lost. The average model was used to for decreasing the computational effort of analysis of DC-DC converters in the time domain. For these simulations VHDL-AMS language was used. The main topic of the thesis is harmonic balance method, which was adapted to DC-DC converters. Because conditions and assumptions for LTO and CTO functions are very different, harmonic balance method was derived into two variants. For obtaining of LTO response, duty cycle of switching signal can be considered as constant in time. Spectrum of this signal is simple as follows from well-known sinc function. For obtaining of CTO response PWM modulation must be used. Compared to sinc function spectrum of PWM modulation is richer (contains more combination frequencies). Many types of PWM modulation is described in [31]. For simulation PWM modulation with uniform sampling in two variants (single and double edge) was used. Non-ideal switching of PWM switch was modeled by PWM pulse with defined slew rate. Last section deals with comparison of all derived functions (LTO, CTO, modulation type, defined slew rate) with well-known averaged model.
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Boris, Ličina. "Metoda merenja snage i energije vetra zasnovana na merenju na intervalu." Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2020. https://www.cris.uns.ac.rs/record.jsf?recordId=114163&source=NDLTD&language=en.
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U disertaciji je prikazan i predložen novi metod merenja snagei energije vetra koji se bazira na stohastičkoj digitalnoj mernojmetodi (SDMM), umesto do sada korišćene standardne semplingmetode (SSM). Standard za merenje brzine vetra predstavljaanemometar sa šoljicama, koji na svom izlazu daje sinusni napončija su amplituda i frekvencija linearno zavisne od brzinevetra. Kako su snaga i energija vetra proporcionalne trećemstepenu brzine vetra, u tu svrhu se primenjuje generalizovanhardver namenjen za računanje proizvoda tri ulazna signala. Zbogniskog frekvencijskog opsega ulaznog signala izvršeno jeznačajno pojednostavljenje hardvera mernog uređaja. Teorijskomanalizom, simulacijom, a potom i eksperimentom potvrđena jehipoteza istraživanja, da se SDMM uspešno može koristiti zamerenje snage i energije vetra.In this dissertation а new wind power and energy measurementmethod, based on Stochastic Digital Measurement Method (SDMM),was elaborated and proposed, to replace the commonly used StandardSampling Method (SSM). The standard for wind speed measurement isa cup anemometer that provides a sinusoidal voltage on its output,having the amplitude and frequency linearly dependent of the windspeed. Since the wind power and energy are proportional to the thirddegree of the wind speed, the general case hardware has been designedfor the product calculation over three input signals. The low frequencyrange of the input signal allows for a significant simplification of themeasuring instrument hardware. By theoretical analysis andsimulation, and consequently through an experiment the hypothesis ofthis research was confirmed - that SDMM can be successfully used tomeasure wind power and energy.
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GIU, GUO-ZHEN, and 邱國珍. "High frequency quasi-resonant 'CUK converter." Thesis, 1988. http://ndltd.ncl.edu.tw/handle/16475920676707101656.
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Wang, Chien-Hung, and 王健鴻. "Digital Control for Cuk PFC Converter." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/85361477657003231723.
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碩士國立交通大學
電機學院電機與控制學程
104
This thesis presents Cuk converter and its digital control method to achieve the power factor correction (PFC) function. Compared to the common dual- loop-control method, this thesis focuses on the new control mode to meet IEC61000-3-2 harmonic standard. This context is adopted from Texas Instruments C2000 series TMS320F28335 , of which DSP chip is to be controlled by the entire circuit. This DSP is categorized into TMS320F28X series, which has floating-point capabilities. Compared to the fixed-point DSP, it has not only more accuracy arithmetic function, but also has the advantages of low cost and low power consumption. Furthermore, it can hold greater data storage capacity and handle more accurate and faster AD converter, and so on. Digital Power Control is equipped easy and convenient applicability, providing better power management system, sophisticated power control solution, common design platform power control, cost decrease factor, and, most importantly, value-added intelligent integration. As the above-mentioned advantages are derived from programmable feature, so this is also a main factor to use DSP Chip to replace analog PWM IC.
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YANG, JIN-DE, and 楊進德. "High frequency multi-resonant 'Cuk converter." Thesis, 1990. http://ndltd.ncl.edu.tw/handle/48884549100181992421.
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Chen, Yong-Lu, and 陳永錄. "Analysis and Design of Novel Cuk-Sepic Converter." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/06350785628102528612.
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碩士國立臺灣海洋大學
電機工程學系
96
This paper proposes a novel bipolar voltage dual output DC-DC converter. Its topology is based on Cuk converter and Sepic converter. By using a single power switch to coupled inductors,without use of transformers,to construct a Cuk-Sepic converters. In this paper,we analysis and design of Cuk-Sepic converter circuit in a continuous current mode,and using simulation software IsSpice to verify converter circuit characteristics.
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Huang, Chien-Lan, and 黃建嵐. "The Zero Voltage Switching Active Clamp Cuk converter." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/82422949523497952672.
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碩士國立雲林科技大學
電機工程系碩士班
95
In this thesis, an active clamp Cuk PWM converter is analyzed for continuous conduction mode (CCM). Cuk topology has gathered more attention in recent years. Base on the continuous input and output current, wide output voltage range and small output filter. The active clamp technique is used to improve circuit efficiency and achieve zero voltage switching (ZVS). In the proposed converter, both main switch and auxiliary switches are soft-switching to increase of the efficiency and increase the power density. Operation principle, design analysis and conditions of zero voltage switching of the power switches are described. Finally, some simulation and experimental results are presented to verify the effectiveness of the proposed converter.
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Cheng, Ming-Chieh, and 鄭明杰. "A Zero Input Current Ripple Cuk Converter for Photovoltaic Systems." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/xf9fy8.
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碩士國立清華大學
電機工程學系
97
Due to the limited fossil energy and greenhouse effect, more and more countries are devoting to development and promotion of renewable energy sources. Among the various renewable energy sources, solar energy has the advantages of being inexhaustible and noiseless. Hence, installation of photovoltaic (PV) power generation systems keeps a rather high growing rate in recent years. However, the output voltage of the solar cells changes rapidly with the insolation. Hence, a switching power converter is required as a regulator for achieving the maximum output power of the PV power generation system. In this thesis, Cuk converter is adopted because of its step up/down capability and nonpulsating input/output current feature. However, the inherent current ripple of switching power converter indeed may cause significant impact on the output power. Hence, the major objective of this thesis is focused on the further study of the quantitative output power reduction effect of the input current ripple of PV systems as well as proposing ripple cancelling techniques to solve the above dilemmas. Basically, the contributions of this thesis can be summarized as follows. First, the power reduction caused by the current ripple of solar cells is analyzed through an accurate mathematical model. Second, an active ripple cancelling technique is proposed to eliminate the current ripple of the conventional Cuk converter effectively. By proper design of an auxiliary circuit, zero input and output current ripples can be achieved. The proposed method does not require an extra control and feedback circuit. Furthermore, based on the ripple cancelling concept, a simple passive ripple cancel technique is proposed. It turns out that the maximum output power of the PV system can now be fully extracted. Third, both DC and AC models of the proposed zero input current ripple Cuk converter are derived for convenient closed-loop controller design. Also, simulation results are made to verify the accuracy of the models. Finally, a 90W, 24V~34V input, 19V output laboratory prototype is constructed to verify the effectiveness of the proposed converter. It is seen that the resulting peak to peak input current ripple is about 2% of the current ripple due to the conventional Cuk converter. Furthermore, at 0.8 kW/m^2 insolation, 50℃ test condition, it is seen that the average output power of the PV array can reach 75W by using the proposed technique. In other words, this amounts to an increase of 7% averaged output power as compared with the conventional Cuk converter.
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Wang, Jian-Ming, and 王見銘. "An active power factor correction technique for CUK type AC to DC converter." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/17206103081059198219.
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Wang, Jin-Ming, and 王見銘. "An Active Power Factor Correction Technique for CUK Type AC to DC Converter." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/96238153615772072630.
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碩士國立海洋大學
電子工程學系
83
In this paper, an active power factor correctioncircuit for CUK type ac-to-dc converter is proposed and analyzed. The conve- rter adopts a frond-end diode rectifier so that only one active switch is required. The converter draws sinusoidal ac current from the ac source with nearly unity input power factor while operting at a fixed switching frequency. Moreover, this paper shows that the active input power factor correction stage is also used to regulate the converter output voltage. We derived some useful functions of discontinuous mode CUK type ac to dc converter, based on Vorperian's PWM switch model, so as to realize the stability analysis of the system. Finally, some selected experimental results are presented to verify the proposed theory.
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Amirabadi, Mahshid. "Soft-Switching High-Frequency AC-Link Universal Power Converters with Galvanic Isolation." Thesis, 2013. http://hdl.handle.net/1969.1/151305.
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In this dissertation the ac-link universal power converters, which are a new class of power converters, are introduced and studied in detail. The inputs and outputs of these converters may be dc, ac, single phase, or multi-phase. Therefore, they can be used in a variety of applications, including photovoltaic power generation, wind power generation, and electric vehicles. In these converters the link current and voltage are both alternating and their frequency can be high, which leads to the elimination of the dc electrolytic capacitors and the bulky low-frequency transformers. Therefore, the ac-link universal power converters are expected to have higher reliability and smaller size. Moreover, these converters are soft switching, which results in negligible switching losses and minimized current and voltage stress over devices.
In the first part of the dissertation, the parallel ac-link universal power converter is studied in detail. This converter is an extension of the buck-boost converter. The series ac-link universal power converter, which is dual of the parallel ac-link universal power converter, is proposed in the second part of this dissertation. This converter is an extension of the Cuk converter. A modified configuration with fewer switches, named sparse ac-link universal power converter is proposed in the third part of this dissertation. The sparse ac-link universal power converters can appear as parallel or series.
The performance of all these configurations is evaluated through simulations and experiments.
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Jao, Chii-Wen, and 饒啟文. "Hybrid Energy Management of Bi-directional Cuk-converter Battery Equalization System and Fuel Cell Generator System." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/87127448608423548473.
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碩士輔仁大學
電子工程學系
92
A fuzzy controlled method for the equalization of series connected lithium-ion batteries is presented. The state-space representation of bi-directional dc-to-dc equalizer that modified from Cuk-converter is derived for design the battery equalization controller. A PWM switching control and equalization with the intelligent state-of-charge (SOC) estimator is employed to balance the cell voltage of the battery strings. An intelligent SOC estimator is designed based on a fuzzy logic control (FLC) with a set of membership function; it can predict the complex cell equalizing dynamics with an accurate state determination of batteries. The validity of the controller design method is further verified by using computer simulation and experiment. After the procedure, a circuit model of fuel cell is constructed, using Pspice software to simulate this model to value the efficiency and accuracy of this circuit model. By the same way, a circuit model of bi-directional Cuk-converter was also constructed simulated and valued. Combined these two circuit models to create a hybrid system, composed of fuel cell generator system and bi-directional FLC-SOC estimator equalization system. This hybrid system can predict the output voltage of the fuel cell, value the energy transfer efficiency between fuel energy into volt energy, value the voltage of each string cell during charging process and the SOC value of each cell also. The numerical results indicate that this hyper system, coordinated these two systems perfectly and smoothly, a high performance of energy management and energy saving system, and the hybrid energy management system with the FLC SOC estimator can improve the equalization performance under the safe operating region of lithium-ion batteries, transfer the energy of fuel cell into equalization system very smoothly and efficiently.
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Silva, Leonardo Candido da. "Power interface for grid-connected pico-hydro systems using PV inverters." Master's thesis, 2018. http://hdl.handle.net/10198/19869.
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Mestrado de dupla diplomação com a UTFPR - Universidade Tecnológica Federal do ParanáThe electrical energy is a contemporaneous paradigm, the demand for electrical energy is evergrowing, and so is the energy supply; By bringing the energy production closer to the end-users, either in urban centers or people in remote areas have a chance to exploit renewable energy resources to produce electrical energy, and become self-sufficient. Hydropower has since long been a reliable power source, as well as being the most cost-effective. Although, it has its issues, e.g., its synchronization to the utility grid depends on the continuous operation mode of the generator. Commercially available low-power inverters, up to 1.5 kW, are designed to be applied in either solar power generation, or wind power generation. These inverters were not designed to be used with hydropower generation. This work evaluates two current-controlled power interface solutions, boost and C´ uk converters, to make a hydropower generator and a commercial photovoltaic inverter compatible. The models, simulations and tests of the proposed power structures along with a commercial photovoltaic inverter emulation are made with Matlab® Simulink®, facilitating the evaluation of the power structure and its controller in a discrete-time domain in a Simulation-in-the-Loop environment, as well as, an implementation using a Real-Time controller board from dSPACE interfacing between the power structure and the controller built-in Simulink® in a Hardwarein- the-Loop test platform with Commercial Phtovoltaic Inverter (CPVI), which allows for rapid prototyping, data acquisition and processing and experimental validation of the proposed solutions.
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Yu, Kuo-Ming, and 尤國明. "Dynamic Analysis of One-Cycle Controlled 'Cuk Converters." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/31833077672131703329.
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碩士國立海洋大學
電機工程學系
87
One Cycle Control is a nonlinear control method. One-Cycle decoupes the output stage from the input stage, allowing their independent design and ensuring rejection of power source perturbations . In this paper,systematic design method for One-Cycle Control systems is provided with the 'Cuk converter as an example.The Flow-Graph modeling technique is employed to study the large-signal and small-signal dynamic behavior of One-Cycle Controlled 'Cuk converters.Finally,simulative and experimental results demonstrate that a 'Cuk converter with One-Cycle Control rejects the power source perturbation and the average of the diode voltage follows the control reference in one cycle.
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Chung-Ta, Chen, and 陳俊達. "Design and Fabrication of Y-cut Lithium Niobate Mode Converter." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/43360147868203024113.
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