Abstract: The present invention provides a transformer including a plurality of magnetic circuits comprised of a plurality of magnetic cores and a coil winding around said magnetic circuits, wherein said coil winding is one or any combination of a coil winding, a planar conductor winding, and an equivalent winding made up of printed circuit boards. The present invention makes different combination of a planar conductor winding, a coil winding, and an equivalent winding made up of printed circuit boards based on actual needs to realize input and output requirements of different current and voltage. Said magnetic circuits disperse heat spots, improve environment of heat dissipation, and enhance output power of said transformer.

Abstract: A method for forming windings of a transformer comprises enwinding windings on a plurality of magnetic circuits of a transformer, so as to reduce the requirements of manufacturing materials of the windings, machine process and manufacturing environment and save the manufacturing cost.

Abstract: The present invention relates to a transformer, and more especially to provides a three-phase transformer. The three-phase transformer includes three single-phase transformers; each single-phase transformer has a plurality of magnetic circuits and windings; said winding is formed by conducting wires continuously crossing through said magnetic circuits of each single-phase transformer in turn on a direction perpendicular to said magnetic circuit. In accordance with the present invention, the three-phase transformer has a simple structure and reduced volume. In addition, the heat radiation is good and then decreases the wastage. Moreover, the craft is simplified and the cost is reduced. The three-phase transformer may input and output larger electric current.