一种新型并联式三相功率因数校正电路的研究

Research on a novel Parallel Three-phase Power Factor Correction

提出了一种由两个单相Sepic电路并联构成的三相功率因数校正器。三相电经工频变压器形成两个相位正交的交流输入,从而避免了3个单相并联时产生的中性点浮动,并能减小三相之间的耦合干扰,使两个单相PFC电路模块化,输入电流波形接近正弦单位功率因数,消除电流谐波的2次分量,使开关管承受较小的电压及电流应力。仿真和实验证明该系统具有高功率因数、低电流畸变、较强抗干扰能力及高可靠性的特点。

A new three-phase power-factor-correction （PFC） scheme is discussed using two single phase power-factor-correction circuit parallel connected.Two phase urthonormal voltage is produced by means of a auto transformer from a three phase input,fluctuation of neutral point by three single phase power-factor-correction circuit parallel connected is canceled,coupling interference is reduced among three phases, two single-phase power-factor-correction modularized circuits is made,input current wave sine with unity power factor suppress the secondary hanuonic of input AC side is realized, voltage and low current stresses across each switch are reduced.Simulation and experimental results prove that it can achieve high power factor,low current, good capahility of anti-interference and high reliability.