摘要
研究一种三相单级全桥结构功率因数校正(PFC)变换器,该变换器工作于电感电流断续模式(DCM),可同时实现PFC、输入/输出侧电气隔离以及输出电压调节。通过对该变换器理想和非理想条件下等效电路的分析,发现由于主电路中各开关管和二极管存在导通压降,当输入电压低于主电路压降时,导通相电流将出现死区,该死区随着输入电压幅值的降低而增大。结合电路的工作原理,提出了一种抑制电流死区的补偿电路。补偿电路由6个小功率开关管和电阻构成,通过相应的控制策略,当输入电压最小的一相电压低于主电路压降时,该相电流通过补偿电路构成回路,消除电流死区。仿真与实验结果证明了理论分析的正确性。
A three-phase single-stage PFC（Power Factor Correction） converter based on full-bridge structureis researched,which operates in DCM（Discontinuous Conduction Mode）,and can realize functions such as PFC,electrical isolation between input and output sides and output voltage regulation. Analysis of the equivalent circuits in both ideal and nonideal conditions shows that,due to the on-state voltage drop of each switch and diode in the main circuit,there will be input current dead zone when its voltage is lower than the voltage drop of main circuit,which will be more serious as the input voltage decreases. According to the working principle of the eircuit,a compensation circuit is proposed to suppress the dead zone,which is composed of six low power switches and resistors. With corresponding control strategy,when the smallest input voltage is lower than the voltage drop ,the current of that phase flows through the compensation circuit, and the dead zone of input current is thus eliminated. Simulation and experimental results show the validity of theoretical analysis.
出处
《电力自动化设备》
EI
CSCD
北大核心
2009年第8期71-74,99,共5页
Electric Power Automation Equipment
基金
台达电力电子科教发展计划资助项目(DREO2006010)~~
关键词
功率因数校正
三相
单级
死区
补偿
变换器
power factor correction
three-phase
single- stage
dead zone
compensation
converter
