基于无源无损缓冲方式的单级电流型全桥PFC电压尖峰抑制策略_英文_

第33卷 第15期 2013年5月25日 中 国 电 机 工 程 学 报

Proceedings of the CSEE Vol.33 No.15 May 25, 2013 ©2013 Chin.Soc.for Elec.Eng.

45

(2013) 15-0045-07 中图分类号：TM 46 文献标志码：A 学科分类号：470 40 文章编号：0258-8013

基于无源无损缓冲方式的单级电流型 全桥PFC电压尖峰抑制策略

朱良梅，孟涛，贲洪奇，孙莹莹

(哈尔滨工业大学电气工程及自动化学院，黑龙江省 哈尔滨市 150001)

A Voltage Spike Suppression Strategy Based on the Passive Lossless

Snubber in a Single-stage Current-fed Full-bridge PFC

ZHU Liangmei, MENG Tao, BEN Hongqi, SUN Yingying

(School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, Heilongjiang Province, China) ABSTRACT: A voltage spike suppression strategy based on passive lossless snubber was investigated for the primary side of the transformer in a single-phase single-stage current-fed full-bridge power factor correction (PFC) converter. The snubber was mainly composed of two capacitors and two inductors. The two capacitors connected in series were used to absorb the voltage spike, and the energy of capacitors could be transferred to the output side of the converter during one switching cycle by the resonance of capacitors and inductors. Operational principle of the passive lossless snubber in a single-phase single-stage current-fed full-bridge PFC converter was analyzed in detail, the influence mechanism of the key parameters on the voltage and current stress of each switch in the PFC converter was analyzed, and the design method of the parameters was given. The validity and feasibility of the presented method were proved by the experimental results, from which the theoretical analysis was also verified.

KEY WORDS: passive lossless snubber; power factor correction (PFC); single-stage; current-fed; full-bridge 摘要：研究一种基于无源无损缓冲方式的单相单级电流型全桥功率因数校正(power factor correction，PFC)变换器变压器原边电压尖峰抑制策略。该缓冲主要由两个电容与两个电感构成。利用两个串联的电容来吸收电压尖峰，利用电感与电容的谐振工作实现能量传递，将电容上的能量在一个开关周期内转移到变换器的输出侧。详细分析该无源无损缓冲在单相单级电流型全桥PFC变换器中的工作机理，分析关键参数对PFC变换器各开关管电压、电流应力的影响机制，给出了各参数的设计方法。实验结果验证了所提方法的有效性

基金项目：国家自然科学基金项目(51107017)；中国博士后科学基金项目(2012M510954)。

Project Supported by National Natural Science Foundation of China (51107017)；China Postdoctoral Science Foundation (2012M510954).

和可行性，同时也证明了理论分析的正确性。

关键词：无源无损缓冲；功率因数校正；单级；电流型；全桥

0 INTRODUCTION

The single-stage power factor correction (PFC) has formed an active area of research owning to its advantages: one energy conversion, simple structure, low cost and isolated characteristics [1-5]. Among the single-stage PFC topologies, the current-fed full- bridge topology is attractive in medium or high power applications due to its excellent operating characteristics, such as galvanic isolation, no output inductor and soft switching [6-7]. However, this topology has its problem, that is, the leakage inductor of the transformer causes high voltage spike across primary side of the transformer, from which the reliability of the converter will be greatly reduced [8-9].

To reduce the voltage spike, a number of solutions have been studied. Most of these solutions involve the addition of an auxiliary circuit composed of one or two active switches and other passive elements to the main circuit. For example, the active clamping technique is introduced in [10-13], a ZVT auxiliary circuit with two active switches is utilized in [6], and an active auxiliary circuit with a single-switch is adopted in [14]. Since the additional switches in these auxiliary circuits operate at twice the switching frequency of the main switches, it’s difficult

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