| 摘要 |
PROBLEM TO BE SOLVED: To provide an induction heating power supply which generates little switching noise, and has little noise of audible frequency, even if two or more sets of the induction heating power supply are installed in the same AC power supply. SOLUTION: In IGBTs 31b, 31d which constitute an inverter circuit 31, generating of a switching noise is suppressed by making the switching turn off or turn on when a sine-wave-like current which flows in an in-series resonance circuit of a capacitor 5 for resonance and a heating coil 6 becomes zero. Moreover, even when a heating electric power to a pan 7 is adjusted with a triac 11, the inverter circuit 31 continues the operation based on the resonance frequency of the in-series resonance circuit. |
