| 摘要 |
A switching power source device in which recovery current can be decreased. The power source device includes a magnetic element connected one of terminals of a power source section, a switch having one end connected with the magnetic element and the other end connected with the other terminal of the power source section, a smoothing capacitor connected between the magnetic element and the other terminal of the power source section, and a diode connected between the magnetic element and the smoothing capacitor with forward direction directed to pass current from the power source section through the magnetic element to the smoothing capacitor. A second magnetic element is provided in a path of recovery current which flows during a closing operation of the switch from the diode to the switch, whereby the second capacitor is charged by current from the first magnetic element during an open state of the switch and a resonance circuit is formed between the first magnetic element and the diode through the second magnetic element, the switch and the second capacitor to pass discharge current from the second capacitor.
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