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)

A Voltage Spike Suppression Strategy Based on the Passive Lossless Snubber in a Single-stage Current-fed Full-bridge PFC

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和可行性,同时也证明了理论分析的正确性。

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.