| 摘要 |
PROBLEM TO BE SOLVED: To reduce switching loss and achieve higher efficiency and noise reduction by providing a capacitor for resonance, a backward diode parallel- connected with a switch means, and a second switch means parallel-connected with a rectifier diode. SOLUTION: A direct-current power supply Vi is connected direct with a main switch element Q1, and is further parallel-connected with a first diode D1. The first diode D1 has a first capacitor C1 parallel-connected thereto. The main switch element Q1 has a rectifier diode D2 series-connected thereto, and the rectifier diode D2 has a load resistance RL series-connected thereto and further a sub-switch element Q2 parallel-connected thereto. The direct-current power supply Vi has a choke coil L1 and a second capacitor C2 parallel- connected thereto. As a result, switching loss is reduced, and higher efficiency and noise reduction are achieved.
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