摘要
两级功率因数校正(PFC)变换器因其较高的功率因数而广泛应用于功率因数校正场合。近年来,随着PFC/PWM复合控制芯片的应用,两级功率因数校正技术得到了很大的发展。传统两级PFC采用后缘/后缘调制方法(Trailing Edge Modulation/Trailing Edge Modulation,TEM/TEM)。而现今广泛使用前缘/后缘调制方法(Leading Edge Modulation/Trailing Edge Modulation,LEM/TEM)可有效减小流经连接前级PFC和后级DC/DC阶段的直直连接电容的电流有效值,但尚未有详细的理论推导。文章在两种调制方法下对流经直直连接电容的电流有效值进行了详细的理论分析,并给出了仿真验证。最后,利用复合控制芯片ML4803设计了一台具有功率因数校正功能的两级PFC变换器,对理论仿真分析进行了实验验证。
The two-stage power factor correction（PFC） converters which have the high power factor,have been widely used in most situations.In recent years,with the PFC and pulse width modulation（PWM） controller combo chip applications,two-stage power factor correction converters have been great developed.In conventional two-stage power factor correction converts,trailing edge modulation /trailing edge modulation（TEM/TEM） is adopted.Nowadays,leading edge modulation /trailing edge modulation（LEM/TEM） are mostly accepted,which could reduce the DC-link capacitor ripple current.However,no mathematical analysis was presented.In this paper,detailed mathematical analyses for two modulation and simulation are carried out.In the end,a two-stage PFC converter with combo chip ML4803 was designed,and the theoretical simulation was experimentally verified.
出处
《通信电源技术》
2010年第3期18-21,共4页
Telecom Power Technology
