共查询到16条相似文献,搜索用时 171 毫秒
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陈道炼 《中国电机工程学报》2007,27(25):85-89
提出了一类基于Boost-Flyback变换器的单级组合式不间断高功率因数AC/DC变换器电路结构与拓扑族。这类变换器由二极管整流桥和具有功率因数校正、不间断供电、输出电压快速调节等功能的Boost-Flyback变换器构成,可以将1种交流电压变换成所需要的输出直流电压。分析研究了这类变换器的3种工作模式(正常工作模式、后备工作模式、充电工作模式)、稳态原理特性、控制策略和关键电路参数设计准则,并给出了原理试验结果。这类变换器具有单级功率变换、不间断供电、网侧功率因数高、蓄电池与电网或负载高频电气隔离、输出电压调节速度快、体积重量小、成本低等优点。 相似文献
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单级并联式高功率因数直流不间断电源 总被引:3,自引:1,他引:2
陈道炼 《中国电机工程学报》2008,28(6):86-91
提出了一类单级并联式高功率因数直流不间断电源(uninterruptible power supply, UPS)电路结构与拓扑族。它是由二极管整流桥与具有功率因数校正、不间断供电、快速输出电压调节等功能的并联式变换器构成。也可以看成是由主直流变换器、辅助直流变换器和充电器3个模块构成。以Buck-Boost式拓扑为例,深入分析研究了这类变换器的工作模式、稳态原理特性、控制策略,给出了关键电路参数设计准则。理论分析与试验结果表明,这类变换器具有单级功率变换、对负载真正的在线不间断供电、网侧功率因数高、蓄电池与电网高频电气隔离、输出电压调节速度快、不需故障检测及模式转换电路、体积重量小、成本低等优点。 相似文献
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在论述单级不间断AC/DC变换器研究现状的基础上,提出了单级、单级组合式、单级并联式不间断高功率因数AC/DC变换器拓扑;分析研究了这类变换器的3种工作模式;给出了原理试验结果。这类变换器实现了不间断供电、功率因数校正、输出直流电压的稳定与调节,具有拓扑简洁,变换效率高,功率密度高,不间断供电,功率因数高,蓄电池与交流电网电气隔离等优点,在计算机、通信、医疗等电子设备中有广泛的应用前景。 相似文献
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提出了一类新颖的不间断高功率因数交流开关电源电路结构与拓扑族.这类交流开关电源,由单级不间断高功率因数AC-DC变换器与DC-AC逆变桥级联而成,前级采用电压型PWM控制技术,后级采用三态DPM电流滞环控制技术.分析研究了这类交流开关电源的三种工作模式和稳态原理.试验结果表明,这类交流开关电源具有拓扑简洁、功率密度高、不间断供电、功率因数高、动态响应快、过载和短路能力强、输出波形THD小等优点. 相似文献
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本文提出了一类新颖的不间断高功率因数交流开关电源电路结构与拓扑族。这类交流开关电源的电路由单级不间断高功率因数AC-DC变换器与DC-AC逆变桥级联而成,前级采用电压型PWM控制技术,后级采用三态DPM电流滞环控制技术。文中分析研究了这类交流开关电源的三种工作模式和稳态原理。试验结果表明,这类交流开关电源具有拓扑简洁、功率密度高、不间断供电、功率因数高、动态响应快、过载和短路能力强、输出波形THD小等优点。 相似文献
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针对直流开关电源设计中,在低输入直流电压下,以简单易行的方式获得高升压比直流输出的困难,使用在开关电源设计中广泛使用的MC34063单片电源控制芯片,通过增加高频升压变压器,给出了具有高升压比变换能力的升压型开关电源设计结果,具有电路结构简单,元件少,使用方便等优点,可用于仅有低压直流电源供电而需要较高直流电压输出的小功率应用场合。 相似文献
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差动Boost直流变换器型高频环节逆变器 总被引:1,自引:0,他引:1
提出并深入研究差动Boost直流变换器型高频环节逆变器的电路拓扑、控制策略、稳态原理特性和关键电路参数设计准则,并给出原理实验结果。这类逆变器是由2个相同的、输出反相低频正弦脉动直流电压的高频电气隔离双向功率流Boost直流变换器以差动电路构成。研究结果表明,这类逆变器具有高频电气隔离、电路拓扑简洁、双向功率流、输入电流纹波小、负载短路时可靠性高、输出容量大等优点,拓宽和丰富了电力电子学高频环节逆变技术理论。 相似文献
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提出了一种宽输入电压范围的双管反激式开关电源作为光伏逆变器辅助电源方案。该开关电源具有多路直流输出,通过调节控制芯片输出脉冲的频率以适应直流输入在较大范围内变化,为光伏并网逆变器的开关器件驱动及控制电路提供稳定的直流电压。介绍了具有功能集成度高、价格低的NCP1252 PWM控制芯片的特性。分析了双管反激拓扑原理及优点,设计了变压器以及各关键电路。试验表明,辅助电源适应光伏逆变器输入直流电压的大范围波动,输出直流电压纹波在可以接受的范围内,可为光伏逆变器长期运行可靠供电。 相似文献
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提出了基于反激F1yback变换器的电流源高频交流环节AC/AC变换器电路结构与拓扑族。该电路结构由输入周波变换器、高频储能式变压器、输出周波变换器以及输入、输出周波变换器构成,能够将一种不稳定畸变的交流电变换成问频率稳定的正弦交流电压;该电路拓扑族包括单四象限功率开关式、推挽式、半桥式、全桥式等四种电路。以单四象限功率开关式电路拓扑为例,分析研究了这类变换器工作模式、稳态原理与电压瞬时值反馈控制策略,给出了变换器的外特性曲线、关键电路参数设计准则。原理试验结果证实了这类变换器新概念的正确性与先进性。 相似文献
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The authors describes a novel DC-DC converter that integrates a Cuk converter and a buck converter to deliver uninterruptible DC output power. This converter has the desirable features of a simple circuit and high efficiency compared with a standalone uninterruptible power supply (UPS). The circuit operation and analysis of the converter, together with experimental results from a prototype circuit, are presented 相似文献
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Norikazu Tokunaga Ikuo Yamato Yasuo Matsuda Hisao Amano 《Electrical Engineering in Japan》1993,113(3):111-122
This paper proposes a new type of high-frequency dc/ac converter developed for flexible, compact and high-efficiency uninterruptible power supply (UPS) systems. The proposed dc/ac converter consists of a high-frequency inverter, a high-frequency transformer and a cycloconverter with a new voltage clamper. This cycloconverter is capable of being operated by both source-commutation and self-commutation (commutation by turning off the switching device). Consequently, by choosing between the two commutating methods, based on consideration and the internal voltage drop caused by commutating reactance, a compact and efficient UPS can be realized. The voltage clamper effectively reduces power loss of the conversion system. Fabrication of a 10-kVA high-frequency link-type dc/ac converter is described and its loss reduction effect is demonstrated. 相似文献
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H. S. Athab Dylan Dah‐Chuan Lu 《International Journal of Circuit Theory and Applications》2013,41(5):483-497
This paper presents a novel input current shaper based on a quasi‐active power factor correction (PFC) scheme. In this method, high power factor and low harmonic content are achieved by providing an auxiliary PFC circuit with a driving voltage which is derived from a third winding of the transformer of a cascaded dc/dc flyback converter. It eliminates the use of active switch and control circuit for PFC. The auxiliary winding provides a controlled voltage‐boost function for bulk capacitor without inducing a dead angle in the line current. Since the dc/dc converter operates at high switching frequency, the driving voltage is also of high switching frequency, which results in reducing the size of the magnetic components. Operating principles, analysis and experimental results of the proposed method are presented. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
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HIROKI WATANABE KAZUHIRO KOIWA JUN‐ICHI ITOH YOSHIYA OHNUMA SATOSHI MIYAWAKI 《Electrical Engineering in Japan》2016,196(3):39-48
This paper proposes a configuration of a single‐phase voltage source inverter that features power decoupling capability. Generally, the converter connected to a single‐phase grid employs bulky dc link capacitors such as electrolytic capacitors in order to decouple the power ripple with twice the frequency of the power supply. The power ripple in the proposed circuit is compensated by an active buffer with small capacitors. In this paper, the fundamental operations of the proposed converter are confirmed by experimental results. From the experimental results, the output current total harmonic distortion (THD) is 3.51%, the ratio of the input current is 14.3%, and the output power factor is over 99%. In addition, the volume of the proposed circuit is reduced by 61% when the carrier frequency is 64 kHz compared to that with a carrier frequency of 16 kHz. Finally, from an evaluation of the power density using Pareto front curves, the proposed circuit achieves high power density in comparison with the conventional circuit. 相似文献
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C. K. Tse 《International Journal of Circuit Theory and Applications》2003,31(2):157-198
This paper discusses the circuit theory aspects of power factor correction in switching converter circuits. The discussion begins with an examination of the requirement of power factor correction in dc/dc converters. Using the concept of zero‐order converter circuits, sufficient conditions for a dc/dc converter circuit to provide power factor correction are derived. The duality principle is applied to generate new converter circuits that can achieve power factor correction. The practical application of power factor correction is considered in conjunction with the requirement of tight output voltage regulation. Detailed study of the circuit configuration that can simultaneously provide power factor correction and output regulation is given. Based on a general three‐port model, the voltage regulator with power factor correction capability is studied in terms of the power flow between the input port, output port and energy storage port. A detailed consideration of the power flow among the three ports leads to the derivation of all possible minimal configurations that can achieve power factor correction and voltage regulation. The efficiencies of these minimal configurations are studied theoretically, leading to the concept of ‘reduced redundant power processing’ which provides important clue to efficiency improvement. Another issue addressed in this paper is the synthesis of practical circuits that can provide power factor correction and output regulation. In particular, four practical minimal configurations that achieve reduced redundant power processing are considered. A systematic synthesis procedure is derived for creating converter circuits that achieve power factor correction and output voltage regulation. The control issue is also investigated in depth, pinpointing the basic requirement on the number of control parameters needed and its relationship with the operating mode. Copyright © 2003 John Wiley & Sons, Ltd. 相似文献