Patent ID: 6801443
Filing Date: 2004-10-05
Classification: B23K,Y02P

Abstract:
A welding-type power supply, comprising:an inverter power circuit, including a bus, a plurality of switches, and a power output; a bus inductor, connected to the inverter and the bus; a snubber circuit connected to the plurality of switches, including a snubber inductor, a snubber capacitor, a recovery switch connected to the snubber inductor and the snubber capacitor, and having a recovery switch control input, and at least one freewheeling circuit including the snubber inductor and at least one freewheeling switch; a snubber capacitor voltage feedback circuit, connected to the snubber capacitor and having a snubber capacitor voltage feedback output responsive to a snubber capacitor voltage; and a control circuit, including a comparison circuit having as an input the snubber capacitor voltage feedback output, and having as a control output a control signal connected to the recovery switch control input.