Patent ID: 7042740
Filing Date: 2006-05-09
Classification: B23K,H02M,Y02B

Abstract:
1. An inverter power supply system comprising: a DC power supply circuit for outputting a smoothed DC voltage; a half-bridge inverter circuit for converting the DC voltage from the power supply circuit to an AC voltage, the inverter circuit including a first switching element, a second switching element, a first auxiliary capacitor and a second auxiliary capacitor for converting the DC voltage from the power supply circuit to an AC voltage; an output control circuit for outputting a first output control signal and a second output control signal with a phase difference of a half cycle to control the inverter circuit; a power output circuit for converting the AC voltage from the inverter circuit into an output power; a third switching element provided between a positive side of the DC power supply circuit and the inverter circuit for interruptively supplying the DC voltage to the first switching element; a fourth switching element provided between a negative side of the DC power supply circuit and the inverter circuit for interruptively supplying the DC voltage to the second switching element; a power switching circuit for bringing the third switching element into and out of conduction in response to an ON/OFF state of the first output control signal while also bringing the fourth switching element into and out of conduction in response to an ON/OFF state of the second output control signal; and an inverter driving circuit for turning on the first switching element when the first output control signal turns ON while turning off the first switching element upon lapse of a first delay time for allowing the first auxiliary capacitor to discharge to a predetermined level after the first output control signal turns OFF, the inverter driving circuit also turning on the second switching element when the second output control signal turns ON while turning off the second switching element upon lapse of a second delay time for allowing the second auxiliary capacitor to discharge to a predetermined level after the second output control signal turns OFF.