Bibliografias temáticas / Frequency converter

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Literatura científica selecionada sobre o tema "Frequency converter"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 31 de maio de 2022

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Artigos de revistas sobre o assunto "Frequency converter"

KUNOMURA, Ken, e Naotaka IIO. "Electronic Frequency Converter". Journal of The Institute of Electrical Engineers of Japan 130, n.º 8 (2010): 530–31. http://dx.doi.org/10.1541/ieejjournal.130.530.

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Tergemes, K. T., A. R. Karassayeva, A. Zh Sagyndikova, Zh K. Orzhanova e Е. Shuvalova. "STABILITY OF ANONLINEAR SYSTEM «FREQUENCY CONVERTER-ASYNCHRONOUS MOTOR»". Series of Geology and Technical Sciences 447, n.º 3 (15 de junho de 2021): 124–28. http://dx.doi.org/10.32014/2021.2518-170x.73.

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In modern industry, various industries are widely used frequency converters (FС) to control the speed of rotation of asynchronous motors. Widely used frequency converters that feed asynchronous motors allow you to optimize production, reduce electrical energy consumption, increase the service life of equipment, etc. The article considers the system "frequency converter-asynchronous motor" as a complex nonlinear automatic control system. On the basis of the linearized transfer function of the frequency converter and the asynchronous motor, the block diagram of the open system "frequency converter - asynchronous motor"is made. The mathematical description of the system is written by algebraic controls in symbolic form. A program for generating the transfer function and calculating the roots of the characteristic equation using the MATLAB application package is presented. To determine the stability of the frequency converter - asynchronous motor system, a program is compiled where the stability of the system is determined by the characteristic roots of the equation. The transient curve of the speed and torque of an asynchronous motor confirms the adequacy of the block diagram "frequency converter-asynchronous motor" and its mathematical description.

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Yang, Tongbin, Xiaotong Guan, Wenjie Fu, Dun Lu, Xuesong Yuan e Yang Yan. "Investigation on 220 GHz Taper Cascaded Over-Mode Circular Waveguide TE0n Mode Converter". Electronics 10, n.º 2 (6 de janeiro de 2021): 103. http://dx.doi.org/10.3390/electronics10020103.

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This paper proposes a taper cascaded over-mode circular waveguide TE0n mode converter for the millimeter and terahertz wave gyrotron. The mode converter of this structure can effectively reduce the difficulty of high frequency mode converter in fabrication. This paper verifies the feasibility of this new structure from theory, simulation, and experiment. Based on coupled wave theory calculations, three TE02-TE01 mode converters with lengths of 65.43 mm (4 segments), 119.3 mm (6 segments) and 136 mm (8 segments) and a TE03-TE02 mode converter with a length of 92 mm (8 segments) are optimized. The conversion efficiency in the frequency band 215–225 GHz is 91.8–94%, 93–95%, 95–98.78% and 95–98.44%. Because the length of the mode converter is clearly limited, this paper selects the TE02-TE01 mode converter with a length of 65.43 mm (4 segments) and the TE03-TE02 mode converter with 92 mm (8 segments) for simulation and experimental verification. In the simulation software Computer simulation technology (CST), the TE02-TE01 and TE03-TE02 mode converters and their composed TE03-TE01 mode converters are selected for modeling and analyzing. The simulation results and theoretical calculation results of the three mode converters only have different degrees of frequency deviation, and the frequency deviation of the 4-stage TE02-TE01 mode converter can be ignored; the frequency deviations of TE03-TE02 mode converter and TE03-TE01 mode converter are 2 GHz and 3 GHz, respectively. The experimental system is a field scanning system based on a vector network analyzer (VNA), which scans the input and output of the mode converter respectively. The experimental result is that when the input mode purity is 92% in TE01 mode, the output mode TE03 mode has a mode purity of 82%, and it has lower transmission loss. In this paper, the results from theory, simulation and experiment are in good agreement. This type of mode converter is easy to prepare, which makes it an effective alternative for high frequency curvilinear waveguide mode converter.

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Zhang, Rui, Wei Ma, Lei Wang, Min Hu, Longhan Cao, Hongjun Zhou e Yihui Zhang. "Line Frequency Instability of One-Cycle-Controlled Boost Power Factor Correction Converter". Electronics 7, n.º 9 (17 de setembro de 2018): 203. http://dx.doi.org/10.3390/electronics7090203.

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Power Factor Correction (PFC) converters are widely used in engineering. A classical PFC control circuit employs two complicated feedback control loops and a multiplier, while the One-Cycle-Controlled (OCC) PFC converter has a simple control circuit. In OCC PFC converters, the voltage loop is implemented with a PID control and the multiplier is not needed. Although linear theory is used in designing the OCC PFC converter control circuit, it cannot be used in predicting non-linear phenomena in the converter. In this paper, a non-linear model of the OCC PFC Boost converter is proposed based on the double averaging method. The line frequency instability of the converter is predicted by studying the DC component, the first harmonic component and the second harmonic component of the main circuit and the control circuit. The effect of the input voltage and the output capacitance on the stability of the converter is studied. The correctness of the proposed model is verified with numerical simulations and experimental measurements.

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Baciu, I., e C. D. Cunţan. "Single-phase frequency converter". IOP Conference Series: Materials Science and Engineering 163 (janeiro de 2017): 012036. http://dx.doi.org/10.1088/1757-899x/163/1/012036.

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Xiong Du, Luowei Zhou e Heng-Ming Tai. "Double-Frequency Buck Converter". IEEE Transactions on Industrial Electronics 56, n.º 5 (maio de 2009): 1690–98. http://dx.doi.org/10.1109/tie.2009.2013752.

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Mikheeva, M. P., V. M. Vinogradov, S. M. Slinkin, V. S. Ovechko, N. I. Likholit e R. A. Petrenko. "Nonlinear optical frequency converter". Journal of Applied Spectroscopy 56, n.º 5-6 (maio de 1992): 530–31. http://dx.doi.org/10.1007/bf00661762.

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Ragimov, M. I., e V. M. Babaev. "Frequency-to-voltage converter". Measurement Techniques 28, n.º 1 (janeiro de 1985): 96–97. http://dx.doi.org/10.1007/bf00861115.

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Ismail, Adla, Lotfi Saidi e Mounir Sayadi. "Wind turbine power converter fault diagnosis using DC-link voltage time–frequency analysis". Wind Engineering 43, n.º 4 (23 de julho de 2019): 329–43. http://dx.doi.org/10.1177/0309524x19858252.

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With the developments in power electronic devices, there is increasing use of the insulated gate bipolar transistor devices in power converters. Power converters are more and more gaining attention in the wind energy conversion system. In this article, a grid-connected wind energy conversion system is considered. Wind energy conversion system optimal operation requires a diagnostic method for back-to-back power converter to be addressed in detail in this article. Therefore, an open-circuit switching fault diagnosis method for a back-to-back power converter is developed to improve the system reliability and optimize the produced power and also achieve its real operational cost. In this work, we investigate only the DC-Link voltage signal and we use the time–frequency analysis to achieve the diagnosis purpose. The scheduled diagnosis approach is divided into two tasks: the first one is the fault detection task and the second one is the fault localization task. The main novelty of the proposed diagnosis approach is to localize the appropriate faulty power converter, that is, rotor side power converter or grid side power converter. Also, this approach is able to localize faults when there is a simultaneous fault on both power converters. Simulations are carried out to verify the robustness of the proposed diagnosis approach. The achieved simulation results would help in diagnosing of Back-to-back power converter that would expectedly cancel the traditional diagnosis method.

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Shilin, A. N., M. N. Mustafa e N. S. Kuznetsova. "LOW-FREQUENCY ELECTROMECHANICAL VIBRATION CONVERTER BASED ON LEVITATION EFFECT". Kontrol'. Diagnostika, n.º 276 (junho de 2021): 52–57. http://dx.doi.org/10.14489/td.2021.06.pp.052-057.

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At present, one of the urgent problems in the energy and industry is to improve the reliability of the operation of various equipment. An effective method for increasing the reliability of equipment is diagnosing the state of machines and predicting their performance. Vibration control methods are widely used to diagnose rotary rotating machines. By the nature of the vibration process of the machine, it is possible to determine the degree of wear and, accordingly, the technical condition of the machines. In measuring technology for diagnostics of low-speed equipment with rotation frequencies of a unit of Hz, for example, hydroelectric generators of hydroelectric power plants, inertial electromechanical converters are used. The latest developments of such converters use an electromagnetic suspension with parametric feedback, which allows you to control the rigidity of the oscillatory system. However, for centering the moving part in electromechanical converters, flexible guides are used, which are sources of dry friction, which complicates the simulation of measurement processes and limits the sensitivity threshold to a minimum. In addition, flexible guides limit the frequency range of the converters. Currently, the most promising direction for solving this problem is the levitation effect, which allows you to completely exclude mechanical contact and, accordingly, reduce the sensitivity threshold of the transducer. From the analysis of literary sources, it follows that there are relatively few publications in this area. The proposed article provides an analysis of existing converters, on the basis of which a converter with improved characteristics, a measuring converter, is proposed. The proposed electromechanical converter has improved metrological characteristics and therefore can control and diagnose equipment in various fields of human activity. This problem is especially relevant in the hydropower industry.

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Teses / dissertações sobre o assunto "Frequency converter"

Kantzon, David. "PFC-design for frequency converter". Thesis, Linköpings universitet, Fysik och elektroteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-124547.

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This thesis deals with power factor correction for three-phase systems. A boost-buck topology was described, modeled and then simulated in MATLAB/Simulink. The simulation results show that the system provides a power factor over 99% over the tested power output range. Moreover, the harmonic injection concept was introduced which reduces the total harmonic distortion to 8.72% at full output power. A prototype system was also built using an FPGA for the control system. The prototype did not provide the performance seen in simulation but showed that the method is valid and does provide a higher power factor when used.

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Luschas, Susan 1975. "Radio frequency digital to analog converter". Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/28277.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2003.
Includes bibliographical references (p. 124-126).
Dynamic performance of high speed, high resolution digital-to-analog converters (DACs) is limited by distortion at the data switching instants. Inter-symbol interference (ISI), imperfect timing synchronization and clock jitter are all culprits. A DAC output current controlled by an oscillating waveform is proposed to mitigate the effects of the switching distortion. The oscillating waveform should be a multiple (k*fs) of the sampling frequency (f), where k>l. The waveforms can be aligned so that the data switching occurs in the zero regions of the oscillating output. This makes the DAC insensitive to switch dynamics and jitter. The architecture has the additional benefit of mixing the DAC impulse response energy to a higher frequency. An image of a low IF input signal can therefore be output directly at a high IF or RF frequency for transmit communications applications. A narrow-band sigma-delta DAC with eight unit elements is chosen to demonstrate the radio frequency digital-to-analog converter (RF DAC) concept. A sigma-delta architecture allows the current source transistors to be smaller since mismatch shaping is employed. Smaller current source transistors have a lower drain capacitance, allowing large high frequency output impedance to be achieved without an extra cascode transistor. Elimination of the cascode reduces transistor headroom requirements and allows the DAC to be built with a 1.8V supply. The RF DAC prototype is targeted to GSM transmit specifications and implemented in 0.1 8ptm CMOS technology. Measured single-tone SFDR is -75dBc, SNR is 52dB, and IMD3 is -70.8dBc over a 17.5MHz bandwidth centered at 942.5MHz. Measured SNR has the predicted dependence on the phase alignment of the data clock and oscillating pulse.
by Susan Luschas.
Ph.D.

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Xu, Ping. "High-frequency Analog Voltage Converter Design". PDXScholar, 1994. https://pdxscholar.library.pdx.edu/open_access_etds/4891.

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For many high-speed, high-performance circuits, purely differential inputs are needed. This project focuses on building high-speed voltage converters which can transfer a single-ended signal to a purely differential signal, or a differential input signal to a single-ended signal. Operational transconductance amplifier (OTAs) techniques are widely used in high-speed continuous-time integrated analog signal processing (ASP) circuits because resistors, inductors, integrators, buffers, multipliers and filters can be built by OT As and capacitors. Taking advantage of OT As, very-high-speed voltage converters are designed in CMOS technology. These converters can work in a frequency range from DC (OHz) up to lOOMHz and higher, and keep low distortion over a± 0.5V input range. They can replace transformers so that designing fully integrated differential circuits becomes possible. The designs are based on a MOSIS 2μm n-well process. SPICE simulations of these designs are given. The circuit was laid out with MAGIC layout tools and fabricated through MOSIS. The chip was measured at PSU and Intel circuit labs and the experimental results show the correctness of the designs.

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Liu, Kwang-Hwa. "High-frequency quasi-resonant converter techniques". Diss., Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/74737.

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Two waveform-shaping techniques to reduce or eliminate the switching stresses and switching losses in switching-mode power conversion circuits are developed: the zero-current switching technique and the zero-voltage switching technique. Based on these two techniques two new families of quasi-resonant converters are derived. Since the stresses on semiconductor switching devices are significantly alleviated, these quasi-resonant (QRC) converters are suitable for high-frequency operations with much improved performances and equipment power density. Employing the duality principle, the duality relationship between these two families of quasi-resonant converters are derived. The establishment of the duality relationship provides a framework allowing the knowledge obtained from one converter family to be readily transferred to the other. Further topological refinements are derived through the utilization of parasitic elements in the devices and the circuit. In particular, the two most significant parasitic elements, the leakage inductance of the transformer and the junction capacitances of the semiconductor switch, are incorporated as part of the resonant-tank circuit required by these quasi-resonant converters. Consequently, the detrimental effects due to these parasitic elements are eliminated, and the converters can be operated at very high frequencies.
Ph. D.

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Balakrishnan, Anand Kumar. "Soft switched high frequency ac-link converter". [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-3156.

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Chin, Yuan. "Constant-frequency parallel-resonant converter (clamped-mode)". Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/104308.

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LI, QUAN, e q. li@cqu edu au. "HIGH FREQUENCY TRANSFORMER LINKED CONVERTERS FOR PHOTOVOLTAIC APPLICATIONS". Central Queensland University. N/A, 2006. http://library-resources.cqu.edu.au./thesis/adt-QCQU/public/adt-QCQU20060830.110106.

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This thesis examines converter topologies suitable for Module Integrated Converters (MICs) in grid interactive photovoltaic (PV) systems, and makes a contribution to the development of the MIC topologies based on the two-inductor boost converter, which has received less research interest than other well known converters. The thesis provides a detailed analysis of the resonant two-inductor boost converter in the MIC implementations with intermediate constant DC links. Under variable frequency control, this converter is able to operate with a variable DC gain while maintaining the resonant condition. A similar study is also provided for the resonant two-inductor boost converter with the voltage clamp, which aims to increase the output voltage range while reducing the switch voltage stress. An operating point with minimized power loss can be also established under the fixed load condition. Both the hard-switched and the soft-switched current fed two-inductor boost converters are developed for the MIC implementations with unfolding stages. Nondissipative snubbers and a resonant transition gate drive circuit are respectively employed in the two converters to minimize the power loss. The simulation study of a frequency-changer-based two-inductor boost converter is also provided. This converter features a small non-polarised capacitor in a second phase output to provide the power balance in single phase inverter applications. Four magnetic integration solutions for the two-inductor boost converter have also been presented and they are promising in reducing the converter size and power loss.

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Lopez, Arevalo Saul. "Matrix converter for frequency changing power supply applications". Thesis, University of Nottingham, 2008. http://eprints.nottingham.ac.uk/10477/.

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The purpose of this work is to investigate the design and implementation of a 7.5kVA Matrix Converter-based power supply for aircraft applications (GPU Ground Power Unit). A Matlab/Simulink as well as SABER simulation analysis of the candidate Matrix Converter system is provided. The design and implementation of the Matrix Converter is described, with particular attention to the strict requirements of the given power supply application. This AC-AC system is proposed as an effective replacement for the conventional AC-DC-AC system which employs a two-step power conversion. The Matrix Converter is an attractive topology of power converter for power supply applications where factors such as the absence of electrolytic capacitors, the potentiality of increasing power density, reducing size and weight and good input power quality are fundamental. An improved control structure is proposed. This structure employs an ABC reference frame implementation comprising at the Repetitive Control strategy combined with a traditional tracking controller in order to attenuate or eliminate the unwanted harmonic distortion in the output voltage waveform of the Matrix Converter and to compensate for the steady-state error. The system with the proposed control was initially fully analyzed and verified by simulation. The analysis of the input and output waveforms identified the constraints that need to be satisfied to ensure successful operation of the converter. Finally, to demonstrate both the Matrix Converter concept and the control strategy proposed, a 7.5kVA prototype of the proposed system was constructed and tested in Nottingham PEMC laboratory. The experimental results obtained confirmed the expectations from the simulation study and the validity of the power converter and control design.

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Patel, Chirag. "A time-to-voltage converter". Ohio : Ohio University, 1999. http://www.ohiolink.edu/etd/view.cgi?ohiou1175794164.

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Li, Quan, e q. li@cqu edu au. "DEVELOPMENT OF HIGH FREQUENCY POWER CONVERSION TECHNOLOGIES FOR GRID INTERACTIVE PV SYSTEMS". Central Queensland University. School of Advanced Technologies & Processes, 2002. http://library-resources.cqu.edu.au./thesis/adt-QCQU/public/adt-QCQU20020807.152750.

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This thesis examines the development of DC-DC converters that are suitable for Module Integrated Converters, (MICs), in grid interactive photovoltaic (PV) systems, and especially concentrates on the study of the half bridge dual converter, which was previously developed from the conventional half bridge converter. Both hard-switched and soft-switched half bridge dual converters are constructed, which are rated at 88W each and transform a nominal 17.6Vdc input to an output in the range from 340V to 360Vdc. An initial prototype converter operated at 100kHz and is used as a base line device to establish the operational behaviours of the converter. The second hard-switched converter operated at 250kHz and included a coaxial matrix transformer that significantly reduced the power losses related to the transformer leakage inductance. The soft-switched converter operated at 1MHz and is capable of absorbing the parasitic elements into the resonant tank. Extensive theoretical analysis, simulation and experimental results are provided for each converter. All three converters achieved conversion efficiencies around 90%. The progressive increases in the operation frequency, while maintaining the conversion efficiency, will translate into the reduced converter size and weight. Finally different operation modes for the soft-switched converter are established and the techniques for predicting the occurrence of those modes are developed. The analysis of the effects of the transformer winding capacitance also shows that soft switching condition applies for both the primary side mosfets and the output rectifier diodes.

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Mais fontes

Livros sobre o assunto "Frequency converter"

Converter and filter circuits. Boston: Newnes, 1996.

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Xu, Dianguo, Yueshi Guan, Yijie Wang e Xiangjun Zhang. Multi-MHz High Frequency Resonant DC-DC Power Converter. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-7424-5.

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The modern converter and filter circuit encyclopedia. Blue Ridge Summit, PA: TAB Books, 1993.

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Anne, WardhGillian. Design of a multi-kilowatt, high frequency, DC-DC converter. Birmingham: University of Birmingham, 2003.

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Hung, Chung-Chih, e Shih-Hsing Wang. Ultra-Low-Voltage Frequency Synthesizer and Successive-Approximation Analog-to-Digital Converter for Biomedical Applications. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-88845-9.

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Azcona Murillo, Cristina, Belén Calvo Lopez e Santiago Celma Pueyo. Voltage-to-Frequency Converters. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-6237-8.

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Simplified design of voltage-frequency converters. Boston: Newnes, 1997.

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Corradini, Luca, Dragan Maksimović, Paolo Mattavelli e Regan Zane. Digital Control of High-Frequency Switched-Mode Power Converters. Hoboken, NJ, USA: John Wiley & Sons, Inc, 2015. http://dx.doi.org/10.1002/9781119025498.

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McLyman, Colonel William T. Designing magnetic components for high frequency DC-DC converters. San Marino, CA (2135 Huntington Dr., Suite 201D, San Marino 91108): KG Magnetics, 1993.

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K, Kokula Krishna Hari, ed. Variable Frequency Digital PWM Control for Low-Power Buck Converters. Chennai, India: Association of Scientists, Developers and Faculties, 2016.

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Capítulos de livros sobre o assunto "Frequency converter"

Zhang, Jun-an, Ruitao Zhang e Guangjun Li. "Phase to Amplitude Converter". In High-Speed and High-Performance Direct Digital Frequency Synthesizer Design, 13–65. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7266-8_2.

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Sun, Yao, Xiaochao Hou, Jinghang Lu, Zhangjie Liu, Mei Su e Joseph M. Guerrero. "Dynamic Frequency Regulation Via Adaptive Virtual Inertia". In Series-Parallel Converter-Based Microgrids, 43–65. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-91511-7_3.

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Gao, Yanxia, Yanping Xu, Shuibao Guo, Xuefang Lin-shi e Bruno Allard. "Study on High-Frequency Digitally Controlled Boost Converter". In Communications in Computer and Information Science, 251–58. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-15853-7_32.

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Barbi, Ivo, e Fabiana Pöttker. "Series Resonant Converter Operating Above the Resonant Frequency". In Power Systems, 115–39. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-96178-1_5.

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Shah, Happy L., Khushali A. Joshi, Nirali A. Solanki, Shreya A. Vyas e Nilesh K. Jaiswal. "Induction Heating Using Three-Phase Variable Frequency Converter". In Information and Communication Technology for Competitive Strategies (ICTCS 2020), 313–24. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0739-4_31.

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Zhang, Jun-an, Ruitao Zhang e Guangjun Li. "High Speed Current Steering D/A Converter". In High-Speed and High-Performance Direct Digital Frequency Synthesizer Design, 67–107. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7266-8_3.

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Alghisi, D., M. Baù, M. Ferrari e V. Ferrari. "Nonlinear Multi-frequency Converter Array for Energy Harvesting from Broadband Low-Frequency Vibrations". In Lecture Notes in Electrical Engineering, 393–96. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-00684-0_75.

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Lin, Shi-Yi, Shih-Kuen Changchien, Chien-Ming Hong e Yi-Nung Chung. "Implementation and Study of Constant-Frequency LLC Resonant Converter". In Intelligent Technologies and Engineering Systems, 643–53. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-6747-2_75.

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Weijie, Dong, Meng Xiaoli, Liu Keyan, Song Xiaohui, Li Yajie e Ye Xueshun. "Research on Frequency-Converter Control Strategy Based on VSM Technology". In Theory, Methodology, Tools and Applications for Modeling and Simulation of Complex Systems, 255–61. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2663-8_27.

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Alghisi, D., M. Baù, M. Ferrari e V. Ferrari. "Multi-frequency Nonlinear Converter Array for Energy Harvesting in Autonomous Sensors". In Lecture Notes in Electrical Engineering, 239–44. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-3860-1_42.

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Trabalhos de conferências sobre o assunto "Frequency converter"

Castagnetti, Davide. "Experimental Comparison Between a Fractal-Inspired Multi-Frequency Piezoelectric Energy Converter and a Traditional Converter". In ASME 2013 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/smasis2013-3020.

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Harvesting energy from ambient vibrations in order to power autonomous sensors is a challenging issue. The aim of this work is to compare the power output from an innovative multi-frequency fractal-inspired piezoelectric converter to that from a traditional multi-cantilever piezoelectric converter. The converters are designed in order to give the same eigenfrequencies in a given range and a prototype of both is built using commercial materials. The experimental tests investigate both the effect of the acceleration and of the resistive load applied to the converters for each of the three eigenfrequencies in the range between 0 and 120 Hz. The fractal-inspired converter exhibits a significantly higher specific output power at the first and third of the eigenfrequencies investigated.

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Laury, John, Lars Abrahamsson e Math Bollen. "Transient Stability of Rotary Frequency Converter Fed Low Frequency Railway Grids: The Impact of Different Grid Impedances and Different Converter Station Configurations". In 2018 Joint Rail Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/jrc2018-6247.

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One method of strengthening low frequency AC railway grids is to upgrade Booster Transformer (BT) catenary systems, to Auto Transformer (AT) catenary systems. An AT catenary system has lower equivalent impedance compared to a BT system. Thus, an upgrade makes the existing converter stations electrically closer. Converter stations may have different types of Rotary Frequency Converters (RFCs) installed in them, and it is not well explored how different RFCs behaves and interact during and after a large disturbance. Using the Anderson-Fouad model of synchronous machines to describe the dynamics of RFCs, several case studies have been performed through numerical simulations. The studies investigate the interactions within and between converter stations constituted with different RFC types, for BT as well AT catenary systems. The numerical studies reveal that replacing BT with AT catenary systems, results in a more oscillatory system behaviour. This is seen for example in the power oscillations between and inside converter stations, after fault clearance.

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Kogler, Helmut, Rudolf Scheidl e Michael Ehrentraut. "A Simulation Model of a Hydraulic Buck Converter Based on a Mixed Time Frequency Domain Iteration". In ASME/BATH 2013 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/fpmc2013-4409.

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Digital hydraulics is an opportunity to realize simple, robust, cheap and energy efficient hydraulic drives. In such systems digital on/off valves are used instead of proportional valves. Moreover, in hydraulic switching converters the valves are actuated within a few milliseconds, which create sharp pressure changes and, in turn, significant wave propagation effects in the pipe system. For a proper design of digital hydraulic systems a sound understanding of these effects is required to achieve the desired behavior of the switching drive system. In such converters, like the buck-, boost or boost-buck-converter, the inductance is one crucial component. It is realized by a simple pipe mainly for cost reasons. Furthermore, switching converters contain some components with nonlinear characteristics, like valves or accumulators, which prevent a comprehensive analysis in frequency domain. For a convenient analysis a qualified model of a hydraulic buck converter based on a mixed time frequency domain iteration is presented. Main parameters of this model are identified and wave propagation effects in the inductance pipe of the converter are investigated by simulation.

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Osadchuk, V. S., e A. V. Osadchuk. "Superhigh-frequency optoelectronics converter". In International Conference on Optoelectronic Information Technologies, editado por Sergey V. Svechnikov, Volodymyr P. Kojemiako e Sergey A. Kostyukevych. SPIE, 2001. http://dx.doi.org/10.1117/12.429756.

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Castagnetti, Davide. "A Fractal-Inspired Multi-Frequency Piezoelectric Energy Converter: Computational and Experimental Characterization". In ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/smasis2012-7962.

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In order to develop self-powered wireless sensor nodes, many energy harvesting devices, able to convert freely available ambient energy into electrical energy, have been proposed in the literature. A promising technique, in terms of simplicity and high conversion efficiency, is the harvesting of ambient kinetic energy through piezoelectric materials. The aim of this work is to design and investigate the modal response and the power output of a fractal-inspired, multi-frequency, piezoelectric energy converter, previously presented by the author. Two are the steps of the work. First, a computational modal analysis of the converter is performed. Second, a physical prototype of the converter is built and its eigenfrequencies and power generation under different resistive loads are experimentally examined in the range between 0 and 120 Hz. The converter exhibits three eigenfrequencies and a good power output, in particular at the first eigenfrequency.

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Goudarzi, Navid, e Kyung Soo Han. "River Turbines Controlled by Mechanical Speed Converters". In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-88417.

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River turbines, also known as zero-head or in-stream turbines, produce electrical power with the kinetic energy of flowing water. Lower investment requirements in their infrastructure, as no dam/head differentials is needed, make them a promising solution to the practice of reducing the power production from conventional resources, especially in remote/off-grid applications. In this work, a speed converter design is introduced to be used for harnessing the hydrokinetic power in a moving mass of water. In contrast to power converters, that convert a variable power to a constant power, a speed converter, converts a variable rotational speed into a constant speed. It has four major advantages: (1) the all-gear configuration facilitates scalability of the power rating, (2) the produced constant speed, a grid-quality constant frequency, with/without grid connection, can be generated, (3) it’s simple and durable design make it a more economic option. The results show these advantageous through lab-scale and real-environment experimental testing.

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Borodin, N. I., e E. V. Vasilevich. "Reliability Evaluation of Frequency Converter". In 2006 8th International Conference on Actual Problems of Electronic Instrument Engineering. IEEE, 2006. http://dx.doi.org/10.1109/apeie.2006.4292578.

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Peng Huaidong e Li Xiaofan. "Investigation of direct-frequency converter". In Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems. PEDS'99 (Cat. No.99TH8475). IEEE, 1999. http://dx.doi.org/10.1109/peds.1999.794565.

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Shimoji, Y., e N. Djeu. "Efficient superfluorescent HCl frequency converter". In Conference on Lasers and Electro-Optics. Washington, D.C.: OSA, 1986. http://dx.doi.org/10.1364/cleo.1986.wk16.

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Huijsing, J. H., G. A. van Rossum e M. van der Lee. "Two-Wire Ratio-Frequency Converter". In Twelfth European Solid-State Circuits Conference. IEEE, 1986. http://dx.doi.org/10.1109/esscirc.1986.5468369.

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Relatórios de organizações sobre o assunto "Frequency converter"

Xu, Ping. High-frequency Analog Voltage Converter Design. Portland State University Library, janeiro de 2000. http://dx.doi.org/10.15760/etd.6767.

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Liou, L. L., D. M. Lin, J. B. Tsui, J. Schamus e J. T. Morton. Frequency Calibration of A/D Converter in Software GPS Receivers. Fort Belvoir, VA: Defense Technical Information Center, janeiro de 2005. http://dx.doi.org/10.21236/ada483160.

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Geller, J. A DIGITAL VOLTAGE to FREQUENCY CONVERTER for the BOOSTER GAUSS CLOCK. Office of Scientific and Technical Information (OSTI), julho de 1990. http://dx.doi.org/10.2172/1150553.

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Li, S. T., J. B. McGee, P. M. McGinnis, J. H. Schukantz e Jr. Characterization of a High-Power, High-Frequency, Soft-Switching Power Converter for EMC Considerations. Fort Belvoir, VA: Defense Technical Information Center, março de 2001. http://dx.doi.org/10.21236/ada389847.

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Leitherer, Art. Solid State Frequency Converters,. Fort Belvoir, VA: Defense Technical Information Center, julho de 1995. http://dx.doi.org/10.21236/ada302025.

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Roberts, Tony. Single Photon Frequency Convertor with High Quantum Efficiency. Office of Scientific and Technical Information (OSTI), novembro de 2019. http://dx.doi.org/10.2172/1575768.

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Prasad Enjeti e J.W. Howze. Development of a New Class of Low Cost, High Frequency Link Direct DC to AC Converters for Solid Oxide Fuel Cells (SOFC). Office of Scientific and Technical Information (OSTI), dezembro de 2003. http://dx.doi.org/10.2172/861667.

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Hassell, James M., Salome A. Bukachi, Dishon M. Muloi, Emi Takahashi e Lydia Franklinos. The Natural Environment and Health in Africa. World Wildlife Fund and the Smithsonian Conservation Biology Institute, 2021. http://dx.doi.org/10.5479/10088/111281.

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Much of recent human development has come at the expense of Nature - undermining ecosystems, fragmenting habitats, reducing biodiversity, and increasing our exposure and vulnerability to emerging diseases. For example, as we push deeper into tropical forests, and convert more land to agriculture and human settlements, the rate at which people encounter new pathogens that may trigger the next public health, social and economic crisis, is likely to increase. Expanding and strengthening our understanding of the links between nature and human health is especially important in Africa, where nature brings economic prosperity and wellbeing to more than a billion people. Pandemics such as COVID are just one of a growing number of health challenges that humanity is facing as a result of our one-sided and frequently destructive relationship with nature. This report aims to inform professionals and decision-makers on how health outcomes emerge from human interactions with the natural world and identify how efforts to preserve the natural environment and sustainably manage natural resources could have an impact on human and animal health. While the report focuses on the African continent, it will also be of relevance to other areas of the world facing similar environmental pressures.

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Leis, Sherry, e Mary Short. George Washington Carver National Monument plant community report: 2004–2020. Editado por Tani Hubbard. National Park Service, dezembro de 2021. http://dx.doi.org/10.36967/nrr-2288500.

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The Heartland Inventory and Monitoring Network completed its sixth year of plant community monitoring at George Washington Carver National Monument in 2020. Plant community monitoring focused on the restored prairie community. We visited seven monitoring sites in each of the six years and collected data on plant species and ground cover. In this report we also included two environmental factors—precipitation and recent fire history—to better understand the vegetation community status and trends. Since 2000, precipitation has often been below the 30-year normal. Moreover, annual precipitation was below normal for all but one of the monitoring years. We found that the drought in 2012 stood out as possibly influencing plant guild cover. Although prairies are adapted to drought, further analyses might reveal more about the role of climate change in these vegetation communities. Fire management also plays an important role in shaping plant communities. Prescribed fire occurrence became more frequent and consistent through the period of plant monitoring. Additional treatments, including herbicide and mowing, also supported a healthy prairie. The prairie plant community continues to be moderately diverse despite recent increases in tree seedlings and small saplings. Species richness in 2012 was different than in two of the six years monitored. However, diversity indices (H′ and J′) were very similar across monitored years. Species guilds (also known as functional groups) exhibited differing patterns. Woody plants, long a concern at the monument, were statistically similar across years. In 2020, grass-like species increased, but grass species appeared to have declined below prior years. Grass cover in 2004 was statistically different (greater) than in 2008 and 2020. The reasons for this are not clear. Of particular interest to the park is the status of two sumac species (Rhus glabra and R. copallinum). These species were in decline as a result of focused management actions since 2012. However, the blackberry species (Rubus spp.) seemed to be replacing the sumac in some sites. In 2020, nonnative species richness and cover were below peak levels, demonstrating management actions have been successful in maintaining low levels. The vegetation monitoring protocol experienced some changes between 2004 and 2020. A key difference was a shift from sampling twice during the field season to sampling only once in a monitoring year. Although a decline in species richness was anticipated, that pattern was not apparent. However, the abundance of grasses may have been affected by the shift in seasonality of sampling. Additionally, we remedied inconsistencies in how tree regeneration was recorded (stem tallies in some cases and cover estimates in other cases). We converted all cover data to stem tallies and density was calculated to be consistent with the protocol. The monument has had success with coordinating fire management and invasive species management. A decrease in sumac across the prairie is evidence of this success. These actions will continue to be important for maintaining the prairie in good condition into the future.

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Vehicle Surge Reduction Technology during Towing in Parallel HEV Pickup Truck. SAE International, março de 2022. http://dx.doi.org/10.4271/2022-01-0613.

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This paper proposes a technology to reduce vehicle surge during towing that utilizes motors and shifting to help ensure comfort in a parallel HEV pickup truck. Hybridization is one way to reduce fuel consumption and help realize carbon neutrality. Parallel HEVs have advantages in the towing, hauling, and high-load operations often carried out by pickup trucks, compared to other HEV systems. Since the engine, motor, torque converter, and transmission are connected in series in a parallel HEV, vehicle surge may occur when the lockup clutch is engaged to enhance fuel efficiency, similar to conventional powertrains. Vehicle surge is a low-frequency vibration phenomenon. In general, the source is torque fluctuation caused by the engine and tires, with amplification provided by first-order torsional driveline resonance, power plant resonance, suspension resonance, and cabin resonance. This vibration is amplified more during towing. Therefore, this paper proposes two surge reduction technologies to help achieve fuel efficiency and surge at the same time during towing. One technology is a gear shift control that avoids engine operating zones where two or more resonance frequencies coincide, which is realized by changing the equivalent inertia via appropriate gear selection. The second technology is an anti-vibration control, which makes effective use of the hybrid system motors by adding motor torque to suppress the relative displacement between the driveline and the tires.

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