Patent ID: 8258446

Claim:
A power control unit for high-frequency dielectric heating for controlling an inverter circuit for rectifying voltage of an AC power supply, modulating the on time of high frequency switching of a switching transistor, and converting into high frequency power, said power control unit for high-frequency dielectric heating comprising: an input current detection section for detecting input current from the AC power supply to the inverter circuit and outputting input current waveform information; a conversion section for generating a drive signal of the switching transistor of the inverter circuit so that instantaneous fluctuation of the input current waveform information is suppressed; an input voltage detection section for detecting input voltage from the AC power supply to the inverter circuit and outputting input voltage waveform information; and a selection section comprising: a comparison section that compares the input current waveform information to the input voltage waveform information to designate whichever is larger as selected information, and a mix circuit for mixing the selected information and power control information to produce a mixed signal, wherein said conversion section converts the mixed signal into the drive signal of the switching transistor of the inverter circuit.