| 摘要 |
A switching power supply apparatus includes a first commutation inductor which is provided in a path of current flowing from a power supply input unit through a first switching circuit and an inductor during an ON period of a first switching circuit, and a second commutation inductor provided in a path of current flowing through the inductor during an OFF period of the first switching circuit. The first and second commutation inductors and the inductor are connected to a first junction point. One end of a clamping series circuit, which includes a second switching circuit and a series capacitor connected in series, is connected to a second junction point, which connects the first commutation inductor and the first switching circuit, and the other end thereof is connected so that the first and second commutation inductors and the series capacitor constitute a resonance circuit. Accordingly, first and second switching elements can be turned on at a zero voltage.
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