| 摘要 |
PURPOSE:To perform wide power setting rarely generating a timing drift against the change of the input power and the change of the input voltage, keeping the drive timing of a switching element constant, and capable of reducing the circuit loss such as the switching loss. CONSTITUTION:An input current detecting circuit 10 detecting the input current of an inverter circuit 18, a resonance voltage detecting circuit 11 detecting the resonance voltage of the inverter circuit 18, and an excitation pulse signal generating circuit 15 feeding the periodic excitation pulse signal to a switching element 8 are provided in a control circuit 19, the output of the circuit 10 and the output of the circuit 11 are compared, and the result is inputted to the excitation pulse signal generating circuit 15 to generate the excitation pulse signal. |
