IGBT弧焊逆变器低频啸叫剖析及消除

Analyses and Elimination of Lower Frequency Whistle of IGBT Welding Converter

PWM调制的IGBT弧焊逆变器因IGBT存在导通时间，而在小负载时产生低频啸叫，具有恒流特性的弧焊逆变器必须设置最小导通比dmin限制才能消除低频啸叫，理论上要求dmin≥ton，以保证系统运行在PWM范围内．

IGBT welding converter with PWM in lower load since IGBT has its switch-on time. Inorder to eliminate the whiste,a minium conducting rasio Dmin be set and dmin≥ton fmust besaticefide so that the converter can work in PWM scope.