Research On One Cycle Controlled Bridgeless Boost PFC Converters

Bridgeless PFC(BLPFC) shows higher efficiency compared with traditional Boost PFC(TBPFC), but it by nature bings higher EMI noise, especially common mode(CM)noise.In this paper, a systematic review of BLPFC is presented, performance comparison between the conventional PFC boost rectifier and a representative member of the BLPFC family is performend. The location of the boost inductor on the AC side makes it difficult to sense the AC line voltage and inductor current, in this paper,One Cycle Control(OCC)technique is implemented in the BLPFC. In the third chapter of the paper, the design process of Dual Boost PFC(DBPFC) converter is expatiated in detail, two experimental converters: 300W DBPFC converters and 300W 2nd DBPFC converters are finished. The experiment result proves that BLPFC has higher efficiency.In order to meet the challenges of ever-increasing power densities of today's ac/dc power supplies, dual coupled winding 2nd DBPFC is discussed in the fourth chapter of the paper. The proposed boost rectifier can reduce the conduction losses and alleviate the diode reverse-recovery problems by using a coupled inductor and two additional diodes. Zero-current turn-off of the output diodes is achieved, and the reverse-recovery currents of the additional diodes are slowed down to reduce the diode reverse-recovery losses. A detailed analysis and a control strategy are presented. Experimental results for a 300W prototype are also discussed to show the performance of the proposed boost rectifier.The equivalent circuits of the bridgeless PFCs are deduced in this paper at last, and find 2nd DBPFC can solve the promble of DBPFC very well, Saber simulation is performed to validate the EMI model and analysis.