OPERATING METHOD FOR INDUCTION HEATING INVERTER DEVICE

PURPOSE:To provide an induction heating inverter device in small size at a low price by leaving a suitable value of capacitor left as connected in series or in parallel relating to a plurality of heating coils in accordance with a required heating condition, and providing as a whole an equivalent single series resonance circuit and also always equalizing this resonance frequency to a Q value. CONSTITUTION:Two sets of induction heating coils are used to serve as two sets of series resonance circuits by respectively using a suitable value of capacitor to supply power to both the coils as a parallel load of a set of inverter device. Concretely relating to the inverter device 2, resonance capacitors Cr3, Cr4 and normally opened contacts 8A, 8B connected in series to these capacitors are newly additionally provided. Thus when the contacts 8A, 8B are closed, power is supplied to the device 2 from the induction heating coils 4, 5, to stop a power feed to the coil 5 when the contacts are opened. Here, the capacitors Cr3, Cr4 are left as in a relation similar to the relation of capacitors Cr1, Cr2 relating to the coil 4 in the past, and only the power feed to the coils 4, 5 is made different.