POWER SUPPLY DEVICE

摘要

A power supply device has resonance-type DC-DC converters of three phases connected in parallel, said converters respectively having operation phases shifted from each other by 120°. The converters include switching circuits, series resonant circuits, and rectifying smoothing circuits, respectively. The series resonant circuits include first transformers, second transformers and resonance capacitors, respectively. Each of primary winding wires of the first transformers, each of primary winding wires of the second transformers, and respective resonance capacitors are connected in series. Each of secondary winding wires of the second transformers is connected to each of the rectifying smoothing circuits. The first transformers are provided with different cores, respectively, the primary winding wires and the secondary winding wires are insulated from each other by means of dividing bobbins, and the secondary winding wires of respective phases are connected in parallel.

主权项

1. A power supply device comprising:
three-phase resonant DC-DC converters which are connected in parallel between an input node of a DC input voltage and an output node of a DC output voltage and of which operation phases are displaced from each other by 120 degrees, wherein the resonant DC-DC converters respectively include:
switching circuits which convert DC to AC by switching the DC input voltage by using first switching elements respectively;serial resonant circuits which are connected to output nodes of the switching circuits respectively; andrectifying-smoothing circuits which are connected to output nodes of the serial resonant circuits respectively, the serial resonant circuits respectively include first transformers, second transformers, and resonance capacitors, primary windings of the first transformers, primary windings of the second transformers, and the resonance capacitors are connected in series with each other respectively, secondary windings of the second transformers are connected to the rectifying-smoothing circuits respectively, the first transformers respectively include separate cores, and respectively have the primary and secondary windings isolated from each other with leakage inductances present between the primary and secondary windings, the secondary windings of different phases being connected in parallel with each other.