A Simple Inverter for Arc-Welding Machines With Current Doubler Rectifier

This letter proposes a novel inverter scheme for arc-welding machines. The output rectifier replaced by a current double rectifier can reduce output ripple current effectively. Therefore, the lower inductance of the inductors can be used to prevent larger voltage spikes that occur during commutation. In comparison with that in the conventional scheme, each inductor´s current in the proposed scheme is half of the output current. Hence, the proposed scheme has lower conduction losses. The turn number of the transformer winding in the proposed scheme is also lower than that in the conventional one. Finally, the 100-A ac arc-welding machine is implemented using the proposed method.