| 摘要 |
PROBLEM TO BE SOLVED: To miniaturize a device, at the same time reduce manufacturing cost and improve conversion efficiency as the entire device. SOLUTION: A device 1 is provided with a transformer 3, for inducing a specific voltage at secondary coil winding 3b based on a voltage that is supplied to primary coil winding 3a, a main switch circuit 10 for supplying an output voltage to the primary coil winding 3a of the transformer 3 by turning on/off a pair of switching elements 11 and 12 according to a switching control signal, a parallel resonance circuit SR for operating a main switch circuit 10 in a zero voltage system, and a rectification circuit 21 for rectifying the induced voltage of the secondary coil winding 3b as a half-bridge parallel resonance type. In this case, the transformer 3 is composed of a leakage transformer and is composed of a secondary coil winding side equivalent leakage inductance 3c of the transformer 3 and a capacitor 20 that is connected in parallel with the secondary coil winding 3b. |
