Charging Device of Capacitive Energy Storage for Micro Resistance Welding

Micro resistance welding is the most common technology for making permanent connection between two conducting materials. This paper proposes a high-efficiency charging device for the capacitive energy storage within the micro resistance welding device power supply utilizing a Flyback converter. Based on the comprehensive analysis of charging device losses, it is determined that one of the main sources of conduction losses in the charging device is the output diode. In order to ameliorate this problem, utilization of a MOSFET transistor as an output diode within the Flyback converter is proposed in order to increase its overall efficiency. The presented results suggest that the proposed Flyback converter topology could improve the power efficiency by 7.0% at 50 kHz switching frequency through minimization of conduction losses in comparison with the traditionally-used Schottky diode.