减小DCM Boost PFC变换器储能电容的方法  

A Method of Reducing Storage Capacitor of DCM Boost PFC Converter

作　　者：勘匕凯[1] 阮新波[1] 冒小晶[1] 叶志红 

机构地区：[1]南京航空航天大学航空电源重点实验室,南京210016 [2]光宝电子有限公司,南京210019

出　　处：《电工技术学报》2012年第1期172-181,共10页Transactions of China Electrotechnical Society

基　　金：光宝电子（东莞）有限公司资助

摘　　要：在DCM Boost PFC变换器中,输入电流含有初始相位与基波电流相差的三次谐波,不仅功率因数较低,且需要更大的输出储能电容。本文提出一种控制方法,在整个输入电压范围内可以使输入电流仅含有一定量的与基波初始相位相同的三次谐波。与定占空比控制相比,在满足IEC 61000 3 2,Class D谐波标准要求的情况下,可以将储能电容量降低为原来的37%。在满足Energy Star对功率因数要求不低于0.9标准的情况下,输出储能电容最多可以减小为原来的43%。为了简化实现电路,本文进一步提出一种拟合占空比的方法。实验结果验证了理论分析的正确性。The input current of DCM Boost PFC converter contains 3rd harmonic which has an initial phase difference of with fundamental harmonic,this results in low PF and large electrolytic capacitor.Injecting appropriate 3rd harmonic which is in phase with fundamental component into the input current is proposed in the paper.The proposed method achieves storage capacitor reduction of 63% and 57% over the constant duty cycle control,when the harmonic specification of IEC 61000-3-2 Class D or Energy Star is met respectively.A method of fitting the duty cycle is further proposed for simplifying the circuit implementation.The experimental results from a 120W universal input prototype are given to verify the effectiveness of the proposed method.

关 键 词：DCM BOOST PFC 储能电容量 三次谐波注入 

分 类 号：TM461[电气工程—电器]