基于FAN9612的交错BCM PFC关键参数设计

Design of key parameters of interleaved BCM PFC based on FAN9612

为了进一步提高功率因数校正(PFC)控制器的性能,首先叙述了工作于临界导通模式(BCM)下的单相双重交错并联型Boost PFC的原理;然后对基于FAN9612控制芯片实现双重并联交错BCM PFC的功率限制电路和补偿网络相关参数进行了详细的设计;最后搭建了400W实验样机,测试了相关波形,对实验结果进行了分析.实验结果表明,通过临界导通控制模式与双重并联交错拓扑相结合,保持了功率开关管零流开通、二极管零流关断无反向恢复电流等优点,并进一步减小了输入纹波,降低了对电磁干扰(EMI)滤波器的要求.

In order to further improve the performance of power factor correction （PFC） controller, this paper describes the principles of single-phase dual interleaved parallel Boost PFC working in the boundary-conduction mode （BCM）, next, designs the related parameters of power-limited circuit and compensation network of dual parallel interleaved BCM PFC implemented by using FAN9612 controller chip in detail, and finally sets up an experimental prototype, tests the relative waveforms and analyzes the experimental results .The results indicates that the advantages of zero-current turning-on of power switch device and zero-current turning-off of diodes with no reverse recovery current and etc. are kept, and reduce further the input ripples, thus lowering the requirements for EMI filters in this paper.