The principle of PFC and the methed of controling PFC by means of pulse width ndm IC 3524and gives the actual circuit of the inversion are welding power source with PFC function are also analysed.

• 介绍了逆变式直流弧焊电源的基本原理，以及在逆变式直流弧焊电源中采用功率因数校正（PFC）的必要性，分析了PFC的原理和利用通用的脉宽调制集成电路3524实现PFC控制的方法，给出了具有PFC功能的逆变式直流弧焊电源的实际电路。