| 摘要 |
PROBLEM TO BE SOLVED: To provide a novel power control circuit capable of adjusting the phase difference of voltage and current accurately while maintaining the resonance frequency, also capable of adjusting the power control of the output load without relying upon the Q factor, and capable of noise resistant stable operation by constituting from phase difference comparison of an output drive circuit and a current signal oscillating in the output load and a controlled voltage signal to a gate signal generation signal with a digital circuit.SOLUTION: In a high frequency induction heating device, where a power control circuit has an input rectifier circuit 1, an output drive circuit 2, a gate signal generation circuit 6, an output control circuit 7, an output load 5, and a current detection means 3, 4, and performs phase control by inputting the voltage signal VRE0 of at least a part of the gate signal generation circuit and two input signals FB of a current signal of the current detection means to the output control circuit 7, the voltage signal VRE0 is inputted to the output control circuit 7 via delay adjustment circuit 23. Consequently, the phase difference unique to the whole circuit is eliminated and accurate control is ensured. |
