Patent ID: 7420828
Filing Date: 2008-09-02
Classification: H05B

Abstract:
1. An induction heating apparatus comprising: a power factor correction circuit that corrects a power factor of an inputted direct-current power supply and supplies a smoothed output voltage to a first capacitor; a booster circuit that inputs the output voltage of said power factor correction circuit, boosts and smoothes the output voltage of said power factor correction circuit, and supplies the boosted and smoothed output voltage to a second capacitor; an inverter circuit that inputs the output voltage of said booster circuit to generate a high-frequency current in a heating coil; a detection circuit that, in driving said power factor correction circuit, detects that said power factor correction circuit is in operation when a voltage at a predetermined portion in said booster circuit reaches a predetermined value, and detects that said power factor correction circuit is in non-operation when the voltage at the predetermined portion in said booster circuit does not reach the predetermined value; and an inverter control circuit that controls output of said inverter circuit such that an input current reaches a target value, and stops the output of said inverter circuit when said detection circuit detects that said power factor correction circuit is in non-operation.