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本文采用相平面法来研究串联谐振式逆变焊机的工作过程．并提出了一种实用的工程计算方法．用此方法较好地完成了谐振式逆变焊机的参数计算．对逆变焊机的设计有指导意义．
In this paper, phase plane method to study the work process of series resonant inverter welding machine. And put forward a practical engineering calculation method. With this method, the parameters of resonant inverter welding machine are well calculated. On the inverter welding design has instructive significance.