Induction heating method and unit

摘要

An induction heating method for an induction heating unit that includes a plurality of heating coils, resonance-type inverters respectively corresponding to the plurality of heating coils and forward converting sections or chopper sections and forward converting sections which are connected to the resonance-type inverters, wherein frequencies of respective currents supplied to the heating coils which are in mutual induction are equalized to each other. The method comprises inductively heating an object to be heated, detecting a phase difference between the currents of the heating coils and while the resonance-type inverters adjust phases of the currents supplied to the heating coils so as to make the phase difference between the currents of the heating coils zero or at a phase difference to be set, the forward converting sections in the induction heating unit in which the forward inverting sections are connected, or the chopper sections in the induction heating unit in which the chopper sections and the forward converting sections are connected, control power supplied to the heating coils, thereby controlling temperature distribution of the object to be heated.