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检索条件"主题词=pulse-width-modulation"

共 59 条记录，以下是31-40 订阅

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Modeling and Implementation of High-Gain Switched-Inductor Switched-Capacitor Converter 14

Modeling and Implementation of High-Gain Switched-Inductor S...

引用

14 International Symposium on Integrated Circuits (ISIC)

作者： Chang, Yuen-Haw Chen, Yu-Jhang Chaoyang Univ Technol Dept Comp Sci & Informat Engn 168 Jifong E Rd Taichung Taiwan

ISBN: (纸本)9781479948338

This paper presents the modeling & implementation of a closed-loop high-gain switched-inductor switched-capacitor converter (SISCC) for step-up DC-DC conversion & regulation. The power part of SISCC consists of two cascaded blocks: (i) Front: a serial-parallel switched-capacitor (SC) circuit with nc pumping capacitors, and (ii) Core: a switched-inductor (SI) booster with mc resonant capacitors, so as to boost the step-up gain up to (nc+1)x(mc+1) at most, where D is the duty cycle of pulse-width-modulation (PWM) control. The control part of SISCC is composed of a phase generator and PWM controller, mainly implemented in the chip (I.C. number: D35-101B-37e, TSMC 0.35 mu m 2P4M, size: 500 mu mx300 mu m, 12.2mW, max. frequency: 200kHz) via full-custom fabrication of National Chip Design and Implementation Center (CIC), Taiwan. Some theoretical analysis includes: formulation, steady-state analysis, and conversion ratio. Finally, the performance of this scheme is verified experimentally on a SISCC prototype, and the results are illustrated to show the efficacy of this scheme.

关键词： switched-inductor switched-capacitor converter step-up pulse-width-modulation full-custom fabrication

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Exact Linearization of PWM-Hold Discrete-Time Systems Using Input Transformation

Exact Linearization of PWM-Hold Discrete-Time Systems Using ...

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European Control Conference (ECC)

作者： Suzuki, Masayasu Hirata, Mitsuo Utsunomiya Univ Grad Sch Engn Dept Elect & Elect Syst Engn 7-1-2 Yoto Utsunomiya Utsunomiya Tochigi Japan

ISBN: (纸本)9783952426937

This report is concerned with discrete-time systems that are derived for continuous-time LTI systems by the pulse-width-modulation (PWM) -hold. The input term of the difference equation describing the discrete-time system is a nonlinear map of the control parameter of the PWM signal, i.e., duty ratio. It is shown that for two-dimensional systems, the nonlinearity of the PWM-hold systems can be exactly compensated by varying the center of each rectangular pulse-waves as well as its duty ratio.

关键词： compensation continuous time systems control nonlinearities difference equations discrete time systems linear systems linearisation techniques multidimensional systems nonlinear control systems power system control pulse width modulation PWM signal PWM-hold discrete-time systems PWM-hold systems nonlinearity continuous-time LTI systems control parameter difference equation duty ratio exact linearization input transformation nonlinear map pulse-width-modulation rectangular pulse-waves two-dimensional systems Control systems DC-DC power converters Discrete-time systems Eigenvalues and eigenfunctions Linear systems Mathematical model pulse width modulation

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Soft-switching techniques for PWM three-level converters 3

Soft-switching techniques for PWM three-level converters

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3rd International Power Electronics and Motion Control Conference (IPEMC 2000)

作者： Ruan, XB Yan, YG Nanjing Univ Aeronaut & Astronaut Teaching & Res Div 303 Nanjing 210016 Peoples R China

ISBN: (纸本)780003464X

This paper proposes a family of modulation strategies including nine modulation strategies for PWM three-level converters. The modulation strategies can be classified into two kinds according to the turn-off sequence of the two power switches of the switches pair. The concept of the leading switches and the lagging switches is introduced to realize soft-switching for PWM three-level converters. The realization of soft-switching for both the leading switches and the lagging switches is proposed, based on which, soft-switching techniques for PWM three-level converters can be classified into two kinds: Zero-Voltage-Switching (ZVS) and Zero-Voltage and Zero-Current-Switching (ZVZCS). The modulation strategies and topologies for the two kinds of soft-switching PWM three-level converters are proposed.

关键词： three-level converter pulse-width-modulation modulation strategy soft-switching

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Experimental Investigation of the Losses and Efficiency of 75 kW Induction Motor Drive System 45

Experimental Investigation of the Losses and Efficiency of 7...

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45th Annual Conference of the IEEE Industrial Electronics Society (IECON)

作者： Aarniovuori, Lassi Karkkainen, Hannu Niemela, Markku Cai, Kewei Pyrhonen, Juha Cao, Wenping Aston Univ Power Elect Machines & Power Syst Grp Birmingham W Midlands England LUT Univ Lab Elect Drives Technol Lappeenranta Finland

ISBN: (纸本)9781728148786

The frequency converter driven IM can be used as a reference for the efficiency level of a drive system. In here, the losses and efficiency of a 75 kW IE3 -rated modern squirrel-cage induction motor are investigated experimentally. First, the result of IEC loss segregation with sinusoidal supply is used to create a reference point. Secondly, five different commercially available voltage source converters are used to drive the same motor in 30 measurement points up to the rated speed and torque. The losses and efficiencies are analyzed with torque values of 10%, 25%, 50%, 75% and 100% of the rated torque of the motor and supply frequency values of 10%, 25%, 50%, 75%, 90% and 100% of the rated motor frequency. The results are presented as frequency torque maps and the loss values are given as Table values. Three of these converters show very similar performance from the energy efficiency point of view. The input-output method is used to determine the losses of the motor and converter.

关键词： AC machines efficiency induction motors losses pulse-width-modulation voltage source converter

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DC Bus Current Analysis Considering AC Current Ripple in Three-phase Voltage Source Converters 18

DC Bus Current Analysis Considering AC Current Ripple in Thr...

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18th European Conference on Power Electronics and Applications (EPE)

作者： Jiang, Dong Li, Qiao Huazhong Univ Sci & Technol State Key Lab Adv Electromagnet Engn & Technol 1037 Luoyu Rd Wuhan Hubei Province Peoples R China

ISBN: (纸本)9789075815245

DC current is an important parameter for the three-phase voltage source converter (VSC). It determines the thermal and reliability status of DC-link capacitor or battery. Analysis and prediction of DC current is associated with three-phase AC current and its ripple, together with the pulse-width-modulation (PWM) method. Based on the AC current ripple prediction method, this paper gives a general DC bus current prediction method with consideration of the AC current ripple. Comparison with simulation results shows the benefits of the method for DC bus current prediction. Experimental results are also provided to validate the prediction result. The predicted DC current ripple can match well with the experimental result.

关键词： DC bus Voltage Source Converter pulse-width-modulation Current ripple

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Modeling and Implementation of High-Gain Coupled-Inductor Switched-Capacitor Step-Up DC-DC Converter 3

Modeling and Implementation of High-Gain Coupled-Inductor Sw...

引用

3rd International Conference on Control and Robotics Engineering (ICCRE)

作者： Chang, Yuen-Haw Lin, Jia-Syun Chaoyang Univ Technol Dept Comp Sci & Informat Engn Taichung Taiwan

ISBN: (纸本)9781538666630

The modeling and implementation of a high-gain coupled-inductor switched-capacitor converter (CISCC) is presented by combining a pulse-width-modulation-based (PWM) controller for realizing step-up DC-DC conversion and closed-loop regulation. The power part from supply Vs to output Vo is composed of two sub-circuits: (i) a coupled-inductor booster (CI booster: a coupled inductor with turn ratio n and a clamping capacitor) and (ii) a three-stage switched-capacitor tripler (SC tripler: three pumping capacitors), so as to provide a total step-up gain up to 3(n+2-D)/(1-D) at most, where D is the duty cycle of charging this inductor (e.g. Vo can reach 38.71 times voltage of Vs theoretically as D=0.58, n=4). The control part consists of (i) sawtooth wave generator, (ii) non-overlapping circuit, and (iii) a PWM compensator, in order to realize the timing operation of topologies as well as enhance the regulation capability for different reference or source/loading variation. The modeling and some theoretical analysis are included, and the performance of CISCC is simulated and verified experimentally on the implemented prototype circuit to show the efficacy of this scheme.

关键词： high-gain coupled-inductor switched-capacitor pulse-width-modulation step-up DC-DC conversion

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Digital Loss-Free Resistor for Power Factor Correction Applications

Digital Loss-Free Resistor for Power Factor Correction Appli...

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39th Annual Conference of the IEEE Industrial-Electronics-Society (IECON)

作者： Marcos-Pastor, A. Vidal-Idiarte, E. Cid-Pastor, A. Martinez-Salamero, L. Univ Rovira & Virgili Dept Elect Elect & Automat Control Engn ETSE E-43007 Tarragona Spain

ISBN: (纸本)9781479902248

The synthesis of a Digital Loss-Free Resistor (DLFR) based on a boost converter in pulse-width-modulation (PWM) operation is presented. The proposed control law is obtained by applying discrete-time sliding mode control theory on the discrete-time model of the boost converter to control the input current. The control law calculates the duration of the switch on-time at the beginning of each switching period in order to reach the proposed discrete-time sliding surface. The resulting digital Loss-Free Resistor (DLFR) can be used as a preregulator for power factor correction in one-phase circuits. Simulations are in good agreement with theoretical predictions.

关键词： AC-DC power conversion loss-free resistor discrete-time sliding-mode control power factor correction pulse-width-modulation

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A Soft-Switching Interleaved Boost DC/DC Converter 19

A Soft-Switching Interleaved Boost DC/DC Converter

引用

19th International Conference on Electrical Machines and Systems (ICEMS)

作者： Wang, Chien-Ming Lin, Chang-Hua Wu, Chia-Chun Chuang, Chun-Wen Natl Ilan Univ Dept Elect Engn Ilan Taiwan

ISBN: (纸本)9784886860989

A novel soft-switching interleaved boost dc/dc converter is proposed in this paper. The proposed converter combines the conventional pulse-width-modulation technique, soft commutation technique to promote the circuit performance. The proposed converter uses two boost dc/dc converters with interleaved operation to increase the output power and reduce the input ripple current and output ripple voltage. Comparison with conventional interleaved boost dc/dc converter, the proposed converter has not additional voltage stress on main switches. A soft-switching auxiliary circuit is configured in the presented dc/dc converter to provide the soft-switching function on main switches and auxiliary switches and improve the problem of switching losses and EMI. A prototype has been implemented in laboratory to verify circuit theory.

关键词： soft-switching pulse-width-modulation boost converter

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Phase-shift PWM for Three-phase Voltage Source Converters 18

Phase-shift PWM for Three-phase Voltage Source Converters

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18th European Conference on Power Electronics and Applications (EPE)

作者： Jiang, Dong Shen, Zewei Qu, Ronghai Huazhong Univ Sci & Technol State Key Lab Adv Electromagnet Engn & Technol 1037 Luoyu Rd Wuhan Hubei Province Peoples R China

ISBN: (纸本)9789075815245

This paper give a overall study of phase-shift PWM in three-phase voltage source converters. By changing the phase-shift of carrier waves, the pulse locations will be changed and impact the system performance. This paper gives a tool to study and predict phase-shift PWM's effect: calculating the six rising and falling edges of the phase voltage in each switching cycle and deriving the voltage and current in each sector. With this tool, the impact of phase-shift PWM on current ripple and EMI has been studied. Phase-shift could be designed with the prediction tool to improve current ripple and EMI of the converter system. Simulation and experimental results are provided to support the study.

关键词： pulse-width-modulation Phase shift Current ripple Electromagnetic Interference

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Integrated 60-V Class-D Power Output Stage with 95% Efficiency in a 0.13μm SOI BCD Process 1

Integrated 60-V Class-D Power Output Stage with 95% Efficien...

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Intelligent Systems and Computer Vision (ISCV)

作者： El Khadiri, Karim Qjidaa, Hassan Sidi Mouhamed Ben Abbellah Univ Lab Elect Signaux Syst & Informat Dhar Mahraz Sci Fac Fes Morocco

ISBN: (纸本)9781479975112

In this paper we present a highly-efficient 60V class-D power stage design in a 0.13 mu m SOI-based BCD process. The integrated output stage consists of a full H-bridge, level shifter, ramp generator, comparator, integrator, and preamplifier. Its performance was found to be better than previously published output stages implemented in SOI based BCD processes, which are typically more complex and costly. The achieved results demonstrate that second-order class-D amplifiers can achieve total-harmonic-distortion (THD) performance compatible with the specifications of high end audio applications (THD & 0.029%). The output stage has a maximum efficiency of 95% and delivers up to 600mW into a 8 Omega Bridge-Tied Load (BTL) with a total area of 1.5 mm(2).

关键词： SOI BCD Class-D audio amplifier Triangle-wave generator pulse-width-modulation

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