Patent ID: 8064228

Claim:
A power supply apparatus with a current-sharing function, comprising: a conversion circuit having a first transformer and a second transformer; the first transformer having a primary winding, a first secondary winding, and a second secondary winding; the second transformer having a primary winding, first secondary winding, and a second secondary winding; wherein the first secondary winding of the first transformer is electrically connected to the first secondary winding of the second transformer in series; the second secondary winding of the first transformer is electrically connected to the second secondary winding of the second transformer in series; and then the two in-series secondary windings are electrically connected in parallel; and the two transformers are symmetrical; a square-wave generating circuit electrically connected to a DC voltage, and the square-wave generating circuit switching the DC voltage into a pulsating voltage; a resonant circuit electrically connected to the square-wave generating circuit, and the resonant circuit having a first capacitor and the primary windings of the transformers; wherein the first capacitor is provided to filter a DC component of the pulsating voltage, and an AC component is coupled from the primary winding of the transformer to the secondary winding of the transformer; and a rectifier-filter circuit having at least two switch components and electrically connected to the secondary windings of the transformers to rectify an AC output voltage outputted from the secondary windings into a DC output voltage, and the DC output voltage outputted to at least one output terminal.