arc welding inverter power 基本例句 弧焊逆变电源 In order to overcome the problems of the hard-switch PFC circuit, a zero-voltage transition topology of APFC technique is introduced in the arc welding converters.根据硬开关电路拓扑的缺点，提出了适用于弧焊逆变电源有源功率因数校正装置的零电压转换软开关拓扑结构。