HIGH FREQUENCY INDUCTION HEATING CIRCUIT

摘要

A high frequency induction heating circuit for heating a plurality of articles where the heating circuit has a semiconductor oscillation circuit which includes a series resonance circuit having a heating coil and a condensor. A detection circuit for detecting changes in impedance and frequency variations in the heating coil is included as well as a current control circuit which is responsive to the detection circuit. A varible control gain regulation apparatus is included in the current control circuit such that current supplied to the coil becomes a non-constant current control depending on the number of articles to be heated.