High frequency heating apparatus

摘要

A high frequency heating apparatus such as microwave ovens includes an inverter circuit having a switching element and converting a commercial ac power supply to a high frequency power supply by controlling "on" and "off" periods of the switching element, a magnetron driven by the inverter circuit, a counter cumulatively counting an operating period of time and a deenergization period of time of the magnetron, and a compensator for compensating an "on" period of the switching element based on a count value of the counter so that an input power to the inverter circuit is rendered constant.