Abstract：A novel three-phase single-stage full-bridge power factor correction (PFC) converter is presented, which can realize the functions such as power factor correction, electrical isolation between input and output sides and output voltage regulation. The mechanism and suppression method of oscillatory voltage across the primary side of transformer is analyzed in detail when the bridge diagonal-leg switches turn on, and a passive snubber circuit is proposed to suppress this oscillatory voltage. The snubber circuit is composed of capacitor, inductors and diodes. The capacitor is connected in parallel with the primary side of transformer to suppress the oscillatory voltage. The energy of capacitor can be transferred to the load during one switching cycle by the resonance of the inductor and capacitor. The oscillatory voltage across the primary side of transformer and the switches is suppressed efficiently through the passive snubber circuit, which has been verified by the experimental results.
孟涛, 贲洪奇, 王大庆. 三相单级全桥PFC变换器无源缓冲电路(英文)[J]. 电工技术学报, 2010, 25(2): 94-100.
Meng Tao, Ben Hongqi, Wang Daqing. The Passive Snubber Circuit Suitable for a Three-Phase Single-Stage Full-Bridge PFC Converter. Transactions of China Electrotechnical Society, 2010, 25(2): 94-100.
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2010, Vol. 25 
