| 摘要 |
PROBLEM TO BE SOLVED: To stabilize the driving of a power-supply circuit even if the winding ratios of a transformer are varied.SOLUTION: A power-supply circuit supplying a power source via a transformer includes: a switch circuit generating a power source occurring in the transformer by oscillation; an oscillation control section driven by a first voltage supplied from a control winding of the transformer and controlling the oscillation of the switch circuit; a diode connected between the control winding and the oscillation control section, and having a reverse recovery time that is set according to the first voltage; and a capacitor connected to a gate of the switch circuit and having capacitance that is set according to the first voltage. |
