Patent attributes
A transformer is formed into a substantially U shape. The length of the transformer may thus be secured, and also the length of pattern wiring between an input terminal and an output terminal of a secondary coil of the transformer and the control terminals of a semiconductor device may be reduced. Moreover, the primary coil and the secondary coil of the transformer are arranged in parallel. The coupling coefficient between the primary coil and the secondary coil is thereby increased. An LC resonant circuit, not including the induction coil, and a switching circuit and the transformer are accommodated inside a housing. A water-cooling radiator is provided inside the housing, and also air inside the housing is circulated by a cooling fan while being guided to the radiator.
