| 摘要 |
A rectified commercially available power source is supplied to one end of a primary coil T1 of a transformer T through a terminal TM1. A capacitor C for rectifying is provided between the terminal TM1 and the ground. A switching device X is provided between the other end of the primary coil T1 and the ground. A power source obtained from a terminal TM3 is supplied as a power source for driving oscillators O1 and O2, PWM circuits P1 and P2, and a driving circuit D. The oscillator O1 supplies a signal based on a preset frequency f1 to the circuit P1. In the circuit P1, a switching signal having a predetermined duty ratio according to the supplied signal is supplied to the circuit D through a switching circuit SW1. In the circuit D, the supplied switching signal is amplified and supplied to a control terminal of the switching device X.
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