电流相位补偿解决单相PFC中的过零畸变

摘要

The active power factor correction(APFC)is a very common technology for a high power factor.But there are in-put current distortions in the vicinity of input voltage zero-crossing of single-phase power factor correction (PFC)convertcr. Zero-crossing distortion appears significantly in the input current at medium input frequencies 360~800 Hz.The major cause of zero-crossing distortion is the phase leading of the input current.The admittance function based on modelling con-verter is given and the cause of the phase leading is found.By compensating the lead phase,the phase lead of the input current is eliminated and the zero-crossing distortion caused by the current phase leading is canceled.%有源功率因数校正(Active Power Factor Correction,简称APFC)是提高功率因数的常用技术,但其输入电流在输入电J卡过零附近存在畸变问题.在中频360～800 Hz的应用场合,过零畸变尤其明显.输入电流过零畸变的主要原因足输入电流相位超前.通过求解PFC变换器的导纳函数,指出输入电流相位超前的原因.在此基础上,通过电流超前相位补偿的方法.消除导纳函数中造成电流相位超前的部分,解决了因电流相位超前引起的过零畸变.