PROBLEM TO BE SOLVED: To solve the problem that a winding density is high at a transformer side constituting a lot of windings, and the density is sparse or thick in some part at series coil side, resulting in increase in copper loss and cost.
SOLUTION: Magnetic parts have a first iron core wound with windings of a transformer and the inductance component of a parallel coil, and a second iron core wound with windings of a series coil. The dimensional ratio of the first and the second iron cores is set in accordance with the winding density. Therefore, for example, the winding is constituted with a moderate thickness at the transformer side, resulting in reducing a copper loss.
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