POWER-FEEDING DEVICE AND INDUCTION HEATING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an induction heating device which is provided with a power feeding device capable of feeding the AC power of different frequencies using a simple constitution.

SOLUTION: An AC voltage value e is converted into the DC power of a DC voltage value, corresponding to the setting input with a converter 311. The DC power is converted to double cycle AC power for alternately outputting a low frequency and a high frequency at a cycle ratio (a duty) corresponding to the setting input by the control of a cycle power control circuit part 330 with an inverter 312. The double-cycle AC power is fed to a matching transformer 321 having a tap 321C with the conditions, in which the resonance impedance is made to correspond to the output impedance of an oscillation circuit part 310. An object 201 to be heated is subjected to the induction heating by an induction heating coil 200, by serially resonating the double-cycle AC power with a low-frequency series resonance circuit 325 or a high-frequency series resonance circuit 326. The object 201 to be heated can be efficiently subjected to the induction heating with the resonance by the double cycles with one induction heating coil 200 by a single oscillation circuit part 310.

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