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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．
PWM modulated IGBT arc welding inverter due to the presence of IGBT on-time, and produce low-frequency whistling in a small load, with constant current characteristics of the arc inverter must be set minimum on-than dmin limit to eliminate low-frequency howling, Theoretically require dmin ≥ ton, in order to ensure that the system is operating within the PWM range.