Power control apparatus for high-frequency dielectric heating

摘要

In order to prevent an excessive voltage from being applied to a magnetron and a rectifier circuit on a secondary side of a leakage transformer and reduce a required time until the start of oscillation of the magnetron, a power control apparatus for high-frequency dielectric heating of the present invention is equipped with a magnetron oscillation detection section for setting magnetron oscillation detection information to be true after a predetermined time has elapsed since the start of the oscillation of the magnetron was detected; and has a configuration in which control is switched, depending on the magnetron oscillation detection information, between a voltage control in which an applied voltage to the magnetron is controlled and a power control in which the input current of an inverter power supply circuit is controlled, and in which the minimum frequency of a switching frequency is switched between a first frequency and a second frequency higher than the first frequency.