一种新型小功率降压PFC电路的性能研究

摘要

提出一种新型降压PFC电路,阐述其工作原理,通过仿真实验获得了开环条件和闭环条件下该电路的性能参数,并和传统CRM升压APFC电路作对比研究.实验验证了该新型降压PFC电路在低压小功率范围内比CRM升压APFC电路效率更高,而且使输出电压降到80 V以下,能有效抑制输出电压纹波,极大地减小了器件应力.%A novel buck power factor correction circuit was proposed and its operating principle was expounded. The performance parameters under the open and closed loop conditions were obtained by simulation test, and a comparative study against the CRM boost power factor correction circuit was performed. The experiment confirms that this new circuit has higher efficiency than the traditional CRM boost circuit in the low-voltage small -power situations. And it makes the output voltage less than 80 V, which can effectively restrain the ripple of the output voltage, and greatly reduce the device stress.