Patent ID: 8338762

Claim:
A power control method 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 method for high-frequency dielectric heating comprising the steps of: detecting input current from the AC power supply to the inverter circuit; acquiring input current waveform information corresponding to the input current; detecting input voltage from the AC power supply to the inverter circuit; acquiring input voltage waveform information corresponding to the input voltage; detecting oscillation of the magnetron to determine whether the magnetron is being oscillated; in response to a determination that the magnetron is not being oscillated, (i) outputting the input voltage waveform information until oscillation of the magnetron is detected; (ii) adding the input current waveform information and the input voltage waveform information output until oscillation of the magnetron is detected, and (iii) converting the addition result of the input current waveform information and the input voltage waveform information into the drive signal of the switching transistor of the inverter circuit; and in response to a determination that the magnetron is being oscillated, converting the input current waveform information, without addition of the input voltage waveform, into the drive signal of the switching transistor of the inverter circuit.