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检索条件"主题词=Pulse-width Modulation"

共 696 条记录，以下是161-170 订阅

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Analysis and Control of Integrated Dual-Boost Topology for Solar-Battery Integration

Analysis and Control of Integrated Dual-Boost Topology for S...

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National Power Electronics Conference

作者： Rana, Debjit Ray, Olive Indian Inst Technol Bhubaneswar Sch Elect Sci Bhubaneswar India

ISBN: (数字)9781728144283

ISBN: (纸本)9781728144283

Distributed generation sources having stochastic power-output characteristics, e.g. solar panels, are preferred to be used in conjunction with storage to improve the availability of the overall system. This paper proposes an Integrated Dual-DC Boost converter topology (IDDBC) as a single-stage power electronic interface for solar battery integration into a dc distribution system. In the present work, the characteristics of proposed topology has been analysed and control scheme for the same proposed. The design aspects for converter topology has been addressed in the paper. The behavior of the topology has been validated using simulation.

关键词： Integrated Dual-DC Boost Converter pulse-width modulation Critical Conduction Mode

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An unbalanced PWM control strategy for the full-bridge series resonant converter 14

An unbalanced PWM control strategy for the full-bridge serie...

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14th IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Hu, Song Li, Xiaodong Changshu Inst Technol Sch Elect & Automat Engn Changshu Peoples R China Macau Univ Sci & Technol Fac Informat Technol Macau Peoples R China

ISBN: (纸本)9781538694909

An unbalanced pulse-width modulation (UPWM) control strategy is proposed to extend zero-voltage switching (ZVS) range and improve the overall efficiency for a full-bridge series resonant converter. Steady-state analysis is performed using fundamental harmonics approximation and the ZVS conditions are Oven. Compared with other fixed-frequency control strategies, all switches of the converter are able to maintain ZVS operation with UPWM control at large variation of converter gain. Experimental results have demonstrated that the proposed UPWM control can improve the converter efficiency with the variations of input/output voltage, especially under light load condition.

关键词： pulse-width modulation resonant power converter zero-voltage switching

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Pulsing Method for an Inverter with a Bi-Directional Switch Setting for Reduced Switching Frequency

Pulsing Method for an Inverter with a Bi-Directional Switch ...

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54th Annual Meeting of the IEEE-Industry-Applications-Society (IEEE IAS)

作者： Robel, Carsten Dost, Philip Sourkounis, Costantinos Ruhr Univ Bochum Inst Power Syst Technol & Power Mechatron D-44801 Bochum Germany

ISBN: (纸本)9781538645390

In this paper a modulation strategy for an active rectifier is discussed with respect to the description of the modulation function. The rectifier is equipped with bi-directional switches to allow full control of the energy flow. This modulation strategy is based on a carrier signal whilst the switching frequency remains variable within a certain range. The switching frequency is dependent on the input value of the inverter output voltage. This modulation strategy allows easy set-up of the output voltage in the full range of positive and negative rectified input voltage. This also allows the direct connection of an energy storage system with a varying voltage as for example a battery system. Due to a variable number of switching pulses this modulation scheme allows a reduction in switching processes depending on the working point, while the underlying switching frequency remains constant based on the underlying PWM signal. This paper focuses on the simplification of the modulation tables and fast Fourier transformations of the different voltage stages in order to evaluate the high frequency impact of the modulation scheme.

关键词： bi-directional blocking switches fast fourier transformation inverter control level control modulation scheme pulse-width modulation pulsing method variable dc-link voltage variable switching frequency

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A Carrier-based modulation Method for the NPC Wind Power Converter Thermal Management During Low-Voltage Ride-Through 11

A Carrier-based Modulation Method for the NPC Wind Power Con...

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11th Annual IEEE Energy Conversion Congress and Exposition (ECCE)

作者： Zhou, Jiuyang Cheng, Po-tai Natl Tsing Hua Univ Inst Elect Engn Hsinchu Taiwan Natl Tsing Hua Univ Dept Elect Engn Hsinchu Taiwan

ISBN: (纸本)9781728103952

The temperature fluctuations in the semiconductor devices within NPC wind power converter during low-voltage ride-through operation is critical in reducing the lifetime cycle of the converter and hence the wind power system. Moreover, the unbalanced voltage sags in three phases may cause unbalanced temperature fluctuations, which makes the power loss balancing among different phases necessary. In this paper, a carrier-based modulation technique is proposed to address this issue. The temperature fluctuations in semiconductor devices among three phases can be balanced, and the largest temperature fluctuation will be reduced. Simulation results are presented to verify the effectiveness of the proposed technique.

关键词： Wind power converter neutral-point clamped (NPC) converter pulse-width modulation zero-sequence voltage injection thermal management low-voltage ride-through (LVRT) reliability

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DC/DC Buck Converter with Build-in Tuned Sawtooth Wave Generator Using CMOS Technology 26

DC/DC Buck Converter with Build-in Tuned Sawtooth Wave Gener...

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26th International Conference on Mixed Design of Integrated Circuits and Systems (MIXDES)

作者： Borkowski, Adam Borejko, Tomasz Pleskacz, Witold A. Warsaw Univ Technol Inst Microelect & Optoelect Warsaw Poland ChipCraft Sp Zoo Lublin Poland

ISBN: (纸本)9788363578169

In this paper low power DC/DC buck converter based on 110 nm standard CMOS process is described. It has been optimized for high power efficiency, stable 1.5 V output voltage with low ripple level and good stability. Implemented system has a maximum 150 mA load current driving capability in the input voltage range 2.5-3.7 V, which is supplying battery voltage used in chip. At least 82% energy efficiency is achieved (in worst process corner) up to 95% at best conditions. Output voltage ripple is below 10 mVpp.

关键词： DC/DC converter switching pulse-width modulation energy efficiency CMOS feedback loop

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Online electrolytic capacitor prognosis system for PWM drives 21

Online electrolytic capacitor prognosis system for PWM drive...

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21st European Conference on Power Electronics and Applications (EPE ECCE Europe)

作者： Kankanamalage, Rajith R. Foster, Martin P. Davidson, Jonathan N. Univ Sheffield Dept Elect & Elect Engn Sheffield S Yorkshire England

ISBN: (纸本)9789075815313

Electrolytic capacitors are ubiquitous in power electronic systems owing to their relatively large capacitance-to-volume ratio provided by virtue of their anodised electrode and electrolyte. As the capacitor ages, the electrolyte solution present in the capacitor is known to reduce and this leads to an increase in the equivalent series resistance (ESR) and a reduction in the capacitance. End-of-life for electrolytic capacitors is indicated by an increase in ESR by a factor of two. Here a prognostic system is proposed that can measure the ESR of a capacitor while it is operating in a PWM circuit. By using lock-in amplifiers synchronised to the PWM fundamental frequency, it is possible to extract precisely capacitor ripple voltage and ripple current. These signals are then combined to provide an estimate for the ESR.

关键词： Capacitance measurements Switching converters pulse-width modulation Prognostics and health management

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Four-Wire Three-Phase Active Power Filter With Fuzzy Controller For Compensation Of Distortion of Currents Unbalance in the Conditions of Fluctuated Load

Four-Wire Three-Phase Active Power Filter With Fuzzy Control...

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IEEE International Conference on Modern Electrical and Energy Systems (MEES)

作者： Vlasenko, Ruslan Bialobrzheskyi, Oleksii Gladyr, Andrii Kremenchuk Mykhailo Ostrohradskyi Natl Univ Inst Electromech Energy Saving & Automat Control Kremenchuk Ukraine

ISBN: (纸本)9781728125695

The methods of control for active power filters are based on modern understanding the power's components. Theoretical insights concerning the definition of inactive components of power, among which pq- and pqr-theory of instantaneous power stand out, are used to determine the specified current of the active power filter. At the same time, a significant indicator of the quality of the device in general is the process of adjustment of current. On the basis of the analysis of known works, it was figured out that the parameters of the compensator's closed-loop current controller shall be defined by the load mode which very often is changeable. Thus the need for adjusting the parameters of the controller arises. The results of previous studies have shown that special based on fuzzy logic approach can be used to adjust the coefficients of the controller. The controller, which is designed using fuzzy logic for correction integral and differential terms, was proposed. The model of a four-wire three-phase power active filter with a fuzzy controller for compensation of distortions of currents unbalances under variable load mode was developed using the graphical programming entwinement. During the study, it was found that the current and power unbalance does not exceed 1% for the calculated mode. Conclusions of research has shown that the current and power imbalance does not exceed 1% for the calculated mode.

关键词： active power filter fuzzy controller pulse-width modulation pqr-theory algorithm Sugeno

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A Delta-Sigma Modulator with UPWM Quantizer for Digital Audio Class-D Amplifier 26

A Delta-Sigma Modulator with UPWM Quantizer for Digital Audi...

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26th International Conference on Mixed Design of Integrated Circuits and Systems (MIXDES)

作者： Kuo, Chien-Hung Liou, Yu-Jie Natl Taiwan Normal Univ Dept Elect Engn Taipei Taiwan

ISBN: (纸本)9788363578169

In this paper, a delta-sigma modulator (DSM) with uniform pulse-width modulation (UPWM) quantizer for digital audio class-D power amplifier is presented. A pole-moving approach for Inverse Chebyshev filters is proposed to stabilize the UPWM modulator as well as improve its performance. The characteristics of the saw-tooth carrier for UPWM quantizer is explored to reduce the output switching rate and the power loss in class-D amplifier in the pulse-density modulation (PDM) case. In the presented single-loop sixth-order UPWM modulator with the ameliorated saw-tooth carrier, an SNDR of 120 dB within 20-kHz bandwidth can be achieved under full-scale signal input. With the proposed schemes, the highest transfer efficiency of 1 for digital class-D amplifier can also be obtained.

关键词： pole-moving saw-tooth delta-sigma modulator pulse-width modulation class-D amplifier

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Circulating Harmonic Currents Prediction for VSI Fed Dual Three-phase IPMSM 11

Circulating Harmonic Currents Prediction for VSI Fed Dual Th...

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11th IEEE International Electric Machines and Drives Conference (IEMDC)

作者： Ye, Donglin Li, Jian Qu, Ronghai Huazhong Univ Sci & Technol Sch Elect & Elect Engn State Key Lab Adv Electromagnet Engn & Technol Wuhan Peoples R China

ISBN: (纸本)9781538693506

The circulating harmonic currents of the voltage-source inverter (VSI) fed dual three-phase machines cause copper losses and deteriorate current THDs. Although many works have been made to reduce low-order harmonic currents, the harmonics near the switching frequency have not been addressed, which usually have high amplitude and would cause extra high-frequency vibrations and noise. In order to suppress these harmonic currents, the influence of PWM methods on harmonic currents is needed. This paper provides a circulating harmonic current prediction method of the general six-phase PWM for parallel three-phase inverters. The harmonic currents are analyzed based on the inverter switching state. By decomposing the voltage in a sampling period into an average voltage and voltage ripple, the equation of harmonic voltage ripple is derived, and then the variation rate of harmonic current can be obtained by combing voltage vectors.

关键词： Asymmetrical six-phase machine circulating harmonic current prediction pulse-width modulation parallel three-phase inverters

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The Influence of SPWM Frequency on the Endurance of Inverter-fed Motor Insulation

The Influence of SPWM Frequency on the Endurance of Inverter...

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IEEE Conference on Electrical Insulation and Dielectric Phenomena (IEEE CEIDP)

作者： Wang, Peng Zhao, Ming Zhou, Qun Zhang, Jiawei Sichuan Univ Coll Elect Engn Chengdu Sichuan Peoples R China Xian Univ Technol Dept Elect Engn Xian Shanxi Peoples R China

ISBN: (纸本)9781728131214

The influence of sinusoidal pulse-width modulation (SPWM) voltage switching frequency and fundamental frequency on the endurance (lifetime) of polyimide film were investigated. Endurance tests at SPWM voltages with switching frequency from 6 similar to 18 kHz and fundamental frequency from 10 similar to 200 Hz were carried out on polyimide film insulation keeping the peak to peak voltage and rise & fall time of the square wave voltage at 3 kV and 260 ns, respectively. Experimental results show that, the endurance of polyimide decrease with increasing switching frequency and tends to increase with fundamental frequency at the SPWM with the same switching frequencies. When assessing the lifetime of insulation systems of inverter-fed motors by the endurance obtained at repetitive square wave voltage with 50% duty cycles, the above influence should be considered.

关键词： Inverter-red motor pulse-width modulation insulation systems partial discharge polyimide endurance

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