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Soft-switching PWM boost full-bridge converter 被引量:4
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作者 周林泉 阮新波 《Journal of Southeast University(English Edition)》 EI CAS 2003年第3期250-255,共6页
This paper proposes a family of PWM modulation strategies for boostfull-bridge (FB) converters. The modulation strategies can be classified into two kinds according tothe turn-on sequence of the diagonal switches. The... This paper proposes a family of PWM modulation strategies for boostfull-bridge (FB) converters. The modulation strategies can be classified into two kinds according tothe turn-on sequence of the diagonal switches. The concept of leading switches and lagging switchesis introduced to realize soft-switching. According to the soft-switching realized by the leadingswitches and the lagging switches, two kinds of soft-switching techniques for PWM boost FBconverters yield: zero-current-switching (ZCS) and zero-current and zero-voltage-switching (ZCZVS).Simulation results verify the analysis. 展开更多
关键词 pwm BOOST full-bridge converters ZERO-CURRENT-SWITCHING ZERO-VOLTAGE-SWITCHING
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OPTIMAL DESIGN OF DUAL STATOR-WINDING INDUCTION GENERATOR WITH PWM CONVERTER 被引量:2
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作者 刘陵顺 胡育文 黄文新 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2006年第3期185-193,共9页
To minimize the reactive power of the converter of the control winding in the novel dual stator-winding induction generator based on the PWM converter, design features of the induction generator with a rectified load ... To minimize the reactive power of the converter of the control winding in the novel dual stator-winding induction generator based on the PWM converter, design features of the induction generator with a rectified load are proposed. The optimization method of excited capacitors to minimize the reactive power of the control winding at a variable speed is given. The calculation capacity of the machine with a diode bridge rectifier load is proposed. To achieve global searching, the integrated method with the improved real-coded genetic algorithm and the twodimensional finite element method (FEM) is introduced. Design results of the sample show that reactive power can be reduced by the method, and the converter capacity can be decreased to 1/3 of output rated power at the speed ratio of 1 : 3, thus reducing the volume and the mass of the inverter. 展开更多
关键词 dual stator-winding induction generator variable speed pwm converter genetic algorithm FEM optimal design
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Simulation on Soft-Switching PWM Converter with High Power Factor 被引量:1
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作者 CHENGuo-cheng KatsunoriTaniguchi 《Journal of Shanghai University(English Edition)》 CAS 2001年第2期123-129,共7页
A new PWM converter based on soft switching is introduced. The converter uses a minimum number of devices, and requires less switching operations than conventional techniques. Switching is realized solely in a ZVS (z... A new PWM converter based on soft switching is introduced. The converter uses a minimum number of devices, and requires less switching operations than conventional techniques. Switching is realized solely in a ZVS (zero voltage switching) mode, therefore the loss is reduced and EMI (electromagnetic interference) is suppressed. The paper analyzes the operation of ZVS, and discusses the methods for maintaining a unit power factor and constant DC voltage. Changing the modulation index M and the phase angle θ keeps the input current in phase with the voltage. It also keeps the current sinusoidal, and ensures a constant output voltage. 展开更多
关键词 soft switching converter ZVS(zero voltage switching) pwm EMI(electromagnetic interference)
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An Analysis of Buck Converter Efficiency in PWM/PFM Mode with Simulink 被引量:1
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作者 Cheng Peng Chia Jiu Wang 《Energy and Power Engineering》 2013年第3期64-69,共6页
This technical paper takes a study into efficiency comparison between PWM and PFM control modes in DC-DC buck converters. Matlab Simulink Models are built to facilitate the analysis of various effects on power loss an... This technical paper takes a study into efficiency comparison between PWM and PFM control modes in DC-DC buck converters. Matlab Simulink Models are built to facilitate the analysis of various effects on power loss and converting efficiency, including different load conditions, gate switching frequency, setting of voltage and current thresholds, etc. From efficiency vs. load graph, a best switching frequency is found to achieve a good efficiency throughout the wide load range. This simulation point is then compared to theoretical predictions, justifying the effectiveness of computer based simulation. Efficiencies at two different control modes are compared to verify the improvement of PFM scheme. 展开更多
关键词 PFM pwm BUCK converter EFFICIENCY
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Novel control scheme for 3-phase PWM current-source converters under unbalanced source voltage conditions 被引量:1
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作者 李玉玲 楼珍丽 张仲超 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2006年第2期263-268,共6页
Under unbalanced source voltage supply, considerable output second harmonics and input low-order harmonics in 3-phase PWM current-source converters (PWM-CSC) are generated. This paper proposes a new deadbeat controlle... Under unbalanced source voltage supply, considerable output second harmonics and input low-order harmonics in 3-phase PWM current-source converters (PWM-CSC) are generated. This paper proposes a new deadbeat controller based on compensation for unbalanced source voltage and current. With the proposed scheme, the second harmonics of the output current are eliminated and low-order harmonics of the source current are reduced effectively. Simulation and experimental results con- firmed the feasibility of the proposed method. 展开更多
关键词 pwm current-source converters pwm-CSC) Unbalanced source voltage conditions Deadbeat control
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EMI Reduction in Low Input Ripple DC-DC Converter using Chaos PWM technique
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作者 Antonella Ragusa Giuseppe Marsala 《Journal of Electronic Research and Application》 2018年第2期42-47,共6页
This paper presents a chaotic PWM switching technique for a high boost DC-DC converter with a very low ripple at the input current.The use of a choatic PWM allows a reduction of Electromagnetic In(EMI)at the output of... This paper presents a chaotic PWM switching technique for a high boost DC-DC converter with a very low ripple at the input current.The use of a choatic PWM allows a reduction of Electromagnetic In(EMI)at the output of power converters by spreading the energy spectrum of the output voltage.In this paper a chaotic PWM,using the Chua oscillator,has been implemented in Matlab for the converter under study and a comparison with a traditional PWM control has been done.A detailed description of the generation of the chaotic carrier is presented and the effect on the output EMI mitigation has been shown. 展开更多
关键词 EMI CHAOTIC pwm SPREADING Spectrum DC-DC converter
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A zero-voltage transition for three-phase double-PWM voltage-fed converter
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作者 屈克庆 陈国呈 +2 位作者 孙承波 李杰 吴国祥 《Journal of Shanghai University(English Edition)》 CAS 2007年第5期496-501,共6页
In comparison with several zero-voltage transition (ZVT) inverter topologies, a double-PWM converter is presented using a simple ZVT topology. The rectifier and inverter of this double-PWM share a set of commutation... In comparison with several zero-voltage transition (ZVT) inverter topologies, a double-PWM converter is presented using a simple ZVT topology. The rectifier and inverter of this double-PWM share a set of commutation circuit which can provide soft-switching for the power devices and the diodes. The commutation circuit consists of 1 auxiliary device, 6 resonant inductors, and 12 diodes. Its topology is simpler than the conventional auxiliary resonant converter, leading to low loss and easy control. The control strategy and resonant working modes are analyzed. Experimental results show good performance of the system. 展开更多
关键词 zero-voltage transition (ZVT) double-pwm converter resonant.
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The Design of A/D Converter Circuit Adopting the Technology of PWM
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作者 Chen Ping Li Jing Zhao MingBo 《微计算机信息》 北大核心 2007年第29期272-274,共3页
This text has expounded the working principle of realizing A/D conversion that utilizes the timer within MCU and combinesthe technology of PWM. The design of hardware circuit, improved gradual approached trial arithme... This text has expounded the working principle of realizing A/D conversion that utilizes the timer within MCU and combinesthe technology of PWM. The design of hardware circuit, improved gradual approached trial arithmetic and relevant program design arediscussed in detail. And it has analyzed the resolution of A/D converter based on the technology of PWM, etc. 展开更多
关键词 pwm A/D 转换分辨率 改进逐次逼近试探算法 比较器 电路设计
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Research on a Novel Inverter Based on DC/DC Converter Topology 被引量:1
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作者 谢少军 樊英 周大可 《Journal of Southeast University(English Edition)》 EI CAS 2002年第4期341-345,共5页
The conventional inverters have the shortcomings of straightway conduction in transistors and the difficulty of realizing soft swit ̄ching. A novel inverter based on the DC/DC converter topology is presented. The inve... The conventional inverters have the shortcomings of straightway conduction in transistors and the difficulty of realizing soft swit ̄ching. A novel inverter based on the DC/DC converter topology is presented. The inverter is comprised of a combined Buck/Boost DC/DC converter and a bridge circuit. The front stage converter is controlled to output variable DC voltage and the bridge circuit is used to convert the DC voltage to AC output. The energy feedback technology and one circle control scheme are used t... 展开更多
关键词 INVERTER DC/DC converter pwm one circle control soft switching
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定频PWM控制混合桥双LLC谐振变换器研究
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作者 潘健 宋豪杰 +1 位作者 刘松林 熊嘉鑫 《电源学报》 CSCD 北大核心 2024年第5期120-132,共13页
针对宽输出电压应用中传统频率控制LLC谐振变换器工作频率范围宽且存在较大循环电流的问题,提出1种定频PWM控制混合桥双LLC谐振变换器。根据原边侧结构的不同,所提变换器有3种拓扑结构形式,分别为半桥-半桥双LLC谐振变换器、半桥-全桥双... 针对宽输出电压应用中传统频率控制LLC谐振变换器工作频率范围宽且存在较大循环电流的问题,提出1种定频PWM控制混合桥双LLC谐振变换器。根据原边侧结构的不同,所提变换器有3种拓扑结构形式,分别为半桥-半桥双LLC谐振变换器、半桥-全桥双LLC谐振变换器、全桥-全桥双LLC谐振变换器。其中,原边侧结构并联输入,2个变压器二次侧串联输出。相较于传统频率控制LLC变换器,3种拓扑形态始终在谐振频率点工作,缩小了开关频率范围;在PWM控制策略下,可以分别实现2倍电压增益、3倍电压增益和4倍电压增益以适应宽电压场合;电路中循环电流损耗低,软开关性能良好。Simulink仿真和实验结果验证了所提方案的可行性。 展开更多
关键词 定频pwm控制 谐振变换器 宽输出电压 软开关
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基于PWM软开关技术的智能充电机的设计与实现
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作者 曾小波 葛庆 旷永红 《自动化应用》 2024年第14期83-85,共3页
针对由工频变压器和整流电路组成的传统充电机存在体积大、不便运输、可靠性差等缺陷,采用无工频变压器开关电源技术,按照蓄电池充电特性曲线特点,采用恒流-恒压(CC-CV)充电法,进行系统方案及主电路设计,并使用整流—Buck降压斩波模式和... 针对由工频变压器和整流电路组成的传统充电机存在体积大、不便运输、可靠性差等缺陷,采用无工频变压器开关电源技术,按照蓄电池充电特性曲线特点,采用恒流-恒压(CC-CV)充电法,进行系统方案及主电路设计,并使用整流—Buck降压斩波模式和PWM软开关技术控制充电机电路。实验表明,与工频型充电机相比,该方法能显著延长蓄电池使用寿命。 展开更多
关键词 pwm软开关技术 能充电机 DC/DC变换器
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Advanced Burst Mode Control to Reduce the Standby Power of Flyback Converter
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作者 Min-Sung Kim Hyoung-Woo Kim +1 位作者 Ji-Hye Jang Ki-Hyun Kim 《Engineering(科研)》 2013年第1期137-141,共5页
This paper we proposed advanced burst mode control technique to reduce the standby power consumption of the switch mode power supply (SMPS). To reduce the standby power consumption, most of the converter use burst mod... This paper we proposed advanced burst mode control technique to reduce the standby power consumption of the switch mode power supply (SMPS). To reduce the standby power consumption, most of the converter use burst mode or skip mode control technique. However Conventional standby mode control techniques have some problems such as audible noise and poor regulation. In proposed techniques, basically, the burst mode control technique is employed to reduce the fundamental switching frequency while limiting the peak drain current. But, in proposed technique, to improve the regulation characteristic, burst period of the proposed technique is shorter than that of the conventional burst mode technique. And also, to reduce the switching loss increase due to the short burst period, burst switching signal of the proposed technique is partially skipped. By using proposed advanced burst mode control technique, calculated standby power is 0.695W while standby power of the conventional burst mode control is 1.014W. 展开更多
关键词 STANDBY power FLYBACK converter pwm IC SMPS
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The Usage of the Digital Controller in Regulating Boost Converter
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作者 Muhanad D. Almawlawe Darko Mitic Marko Milojevic 《Circuits and Systems》 2015年第12期268-279,共12页
This paper proposes the modeling and simulation technique to analyze and design a Boost converter using generalized minimum variance method with discrete-time quasi-sliding mode to adjust the converter switch through ... This paper proposes the modeling and simulation technique to analyze and design a Boost converter using generalized minimum variance method with discrete-time quasi-sliding mode to adjust the converter switch through a pulse width modulation (PWM), so as to enhance a stable output voltage. The control objective is to maintain the sensed output voltage stable, constant and equal to some constant reference voltage (8 volt) in the load resistance variation (24, 48, 240) Ω and input voltage variation (20, 24, 28) volt circumstances. This control strategy is very appropriate for the digitally controlled power converter and for the system requirement accomplishment, resulting high output voltage accuracy. The performance degradation in practical implementation can be expected due to noise, PWM nonlinearities, and components imperfection. The digital simulation using MATHLAB/Simulink is performed to validate the functionality of the system. 展开更多
关键词 BOOST converter INPUT-OUTPUT Measurement QSM (Quasi-Sliding Mode) GMV (Generalized Minimum Variance) pwm (Pulse WIDTH Modulation)
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A Dual-Mode Step-up DC/DC Converter IC with Current-Limiting and EMI Reduction Techniques
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作者 Wan-Rone Liou Ping-Hsing Chen +2 位作者 Marynelle L. Z. Rosales Yeh Chun-Ting Kuo Mei-Ling Yeh 《Journal of Electronic Science and Technology of China》 2008年第3期279-283,共5页
This paper presents a novel dual-mode step-up (boost) DC/DC converter. Pulse-frequency modulation (PFM) is used to improve the efficiency at light load. This converter can operate between pulse-width modulation (... This paper presents a novel dual-mode step-up (boost) DC/DC converter. Pulse-frequency modulation (PFM) is used to improve the efficiency at light load. This converter can operate between pulse-width modulation (PWM) and pulse-frequency modulation. The converter will operate in PFM mode at light load and in PWM mode at heavy load. The maximum conversion efficiency of this converter is 96%. The conversion efficiency is greatly improved when load current is below 100 mA. Additionally, a soft-start circuit and a variable-sawtooth frequency circuit are proposed in this paper. The former is used to avoid the large switching current at the start up of the converter and the latter is utilized to reduce the EMI of the converter. 展开更多
关键词 Boost converter dual-mode converter integrated power management pulse-frequency modulation (PFM) pulse-width modulation pwm
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Grid-Connected PV Solar Energy Converter with Active and Reactive Power Control
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作者 Roberto F. Coelho Artur Pagnoncelli Galbiatti Denizar Cruz Martins 《Journal of Energy and Power Engineering》 2014年第2期331-342,共12页
This work proposes a 12 kW three-phase grid-connected single stage PWM DC-AC converter destined to process the energy provided by a photovoltaic array composed of 57 KC200GT PV modules with high power factor for any s... This work proposes a 12 kW three-phase grid-connected single stage PWM DC-AC converter destined to process the energy provided by a photovoltaic array composed of 57 KC200GT PV modules with high power factor for any solar radiation. The PWM inverter modeling and the control strategy, using dqO transformation, are proposed in order to also allow the system operation as an active power filter, capable to compensate harmonic components and react power generated by the non-linear loads connected to the mains grid. An input voltage clamping technique is proposed to impose the photovoltaic operation on the maximum power point. Simulation and experimental results are presented to validate the proposed methodology for grid connected photovoltaic generation system. 展开更多
关键词 Active and reactive power dqO transformation grid-connected PV systems three-phase DC-AC pwm converter.
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A Novel Approach to Practical Matrix Converter Motor Drive System With Reverse Blocking IGBT
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《变频器世界》 2006年第7期25-26,共2页
a Pole voltage waveforms (VA20 and VA40) for modulation index 0.4 (middle trace is A-phase voltage waveform) x-axis: 1 div.=10ms, y-axis: 1 div.= 100V b Normalized harmonic spectrum for pole voltage of Fig. 9a c A-pha... a Pole voltage waveforms (VA20 and VA40) for modulation index 0.4 (middle trace is A-phase voltage waveform) x-axis: 1 div.=10ms, y-axis: 1 div.= 100V b Normalized harmonic spectrum for pole voltage of Fig. 9a c A-phase current and phase voltage for modulation index 0.4 (reference space vector is in inner layer) 展开更多
关键词 A Novel Approach to Practical Matrix converter Motor Drive System With Reverse Blocking IGBT mode pwm
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具有最优动态响应的PWM型DC-DC变换器非线性控制新策略 被引量:58
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作者 许峰 徐殿国 柳玉秀 《中国电机工程学报》 EI CSCD 北大核心 2003年第12期133-139,共7页
提出一种新颖的PWM变换器非线性控制新策略,通过引入一个非线性积分器,并采用等间隔反向线性复位法,强制被控开关变量平均值在每一个完整的开关周期中严格等于控制基准,彻底解决了因电力电子器件开关时间导致的开关误差,实现变换器在输... 提出一种新颖的PWM变换器非线性控制新策略,通过引入一个非线性积分器,并采用等间隔反向线性复位法,强制被控开关变量平均值在每一个完整的开关周期中严格等于控制基准,彻底解决了因电力电子器件开关时间导致的开关误差,实现变换器在输入电源变化时的零稳态误差。利用带自动积分限幅功能的控制器,在电感电流连续或不连续模式、以及临界状态下,系统均能稳定可靠的工作。利用带双前馈补偿的控制器,变换器对负载扰动的抑制能力显著改善,系统动态响应实现了工程最优动态响应。新策略具有良好的通用性,适用于各种硬开关或软开关方式的Buck、Cuk、半桥或全桥变换器,以及由他们派生出来的其他变换器。 展开更多
关键词 pwm型DC-DC变换器 非线性控制策略 最优动态响应 非线性积分器 电力电子器件
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级联型多电平变换器PWM控制方法的仿真研究 被引量:120
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作者 吴洪洋 何湘宁 《中国电机工程学报》 EI CSCD 北大核心 2001年第8期42-46,共5页
多电平变换器作为一种应用于高压大功率变换场合的新型变换器 ,其相应的电路拓扑结构和PWM控制方法是当前的一个研究热点 ,基于现有的研究成果 ,该文认为当电平数超过 3时 ,采用级联型电路拓扑结构和三角载波PWM法的组合 ,是一种较为可... 多电平变换器作为一种应用于高压大功率变换场合的新型变换器 ,其相应的电路拓扑结构和PWM控制方法是当前的一个研究热点 ,基于现有的研究成果 ,该文认为当电平数超过 3时 ,采用级联型电路拓扑结构和三角载波PWM法的组合 ,是一种较为可行的方案。在此基础上 ,首先讨论了三种已有的多电平变换器三角载波PWM控制方法 ,根据它们各自的优缺点 ,提出了一种新型的适用于级联型多电平变换器的PWM方法。文中介绍了它们的原理和特点 ,为了比较它们的控制效果 ,采用功能强大的Saber软件进行了仿真研究 ,仿真结果表明 ,所提出的方法 ,在输出电压谐波和电压利用率方面 ,兼具前三种方法的优点。最后 ,作者对今后的研究提出了建议。 展开更多
关键词 级联型多电平变换器 脉宽调制 仿真 控制方法 逆变器
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SVPWM的等效算法及SVPWM与SPWM的本质联系 被引量:233
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作者 周卫平 吴正国 +1 位作者 唐劲松 刘大明 《中国电机工程学报》 EI CSCD 北大核心 2006年第2期133-137,共5页
提出了一种电压空间矢量调制的新型等效算法,在该算法中无须进行电压矢量夹角的三角函数的运算,只有普通的四则运算,计算变得非常简单。克服了常规的空间矢量控制方法需要进行复杂的坐标转换、正弦函数和反正切函数运算,导致计算量大并... 提出了一种电压空间矢量调制的新型等效算法,在该算法中无须进行电压矢量夹角的三角函数的运算,只有普通的四则运算,计算变得非常简单。克服了常规的空间矢量控制方法需要进行复杂的坐标转换、正弦函数和反正切函数运算,导致计算量大并且复杂的算法影响计算精度的缺点。详细分析了SVPWM、SPWM与逆变器控制方程的解的关系,得出SVPWM是逆变器控制方程的一个最优解,三角载波调制是逆变器控制方程的在假想中线下的特解,因而空间矢量调制SVPWM和三角载波调制SPWM的本质联系在于二者是同一控制方程的在不同的附加条件下的两个不同的特解。给出了基于空间矢量新型算法下的DC/ACPWM逆变器的实验结果,该结果显示了该算法的正确性和有效性。 展开更多
关键词 电力电子 电压空间矢量脉宽调制 新型算法 pwm变流器 正弦脉宽调制 代数解 最优解
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SPWM变换器无死区滞后控制技术的研究 被引量:10
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作者 毛鸿 吴兆麟 +1 位作者 王毅 李广勇 《电力电子技术》 CSCD 北大核心 2000年第4期7-9,共3页
SPWM变换器中的死区设置使变换器输出电压谐波含量增加、电压利用率和可靠性降低。本文通过对桥式SPWM变换器换流机理的分析 ,指出现有的死区设置方法的不足之处 ,提出一种可以应用于SPWM变换器的无死区控制策略 ,并归纳了可以实现无死... SPWM变换器中的死区设置使变换器输出电压谐波含量增加、电压利用率和可靠性降低。本文通过对桥式SPWM变换器换流机理的分析 ,指出现有的死区设置方法的不足之处 ,提出一种可以应用于SPWM变换器的无死区控制策略 ,并归纳了可以实现无死区控制的变换器的条件。在三相高功率因数PWM整流器样机上的实验结果证明了控制策略的可行性。 展开更多
关键词 变换器 死区 滞后控制 Spwm 换流机理
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