弧焊整流PFC设计

Design of PFC in the arc welding rectifier

晶闸管弧焊整流焊接系统中输入电网电流产生严重畸变,针对这一问题,提出了用Boost电路提高功率因数,即功率因数校正。分析电网电流畸变原因,详细介绍了L4981功率因数校正芯片的工作原理和外围电路,同时计算外围电路参数值的大小。为提高焊接系统电源质量提供一定的指导作用。

Thyristor welding system input power rectifier causes severe distortion,current to solve this problem,this paper proposes using Boost circuit improving power factor,namely the power factor correction.The theoretical analysis for grid current distortion,and introduced in detail the reasons L4981 power factor correction chip works and peripheral circuit,also calculated the size of the outer circuit parameters.This control thought will to improve the welding quality of power system and provide some guidance.