Patent ID: 8536732
Filing Date: 2013-09-17
Classification: H02M

Abstract:
1. A power supply system, for driving a plurality of loads, comprising: a power stage circuit to convert external power signals into first alternating current (AC) power signals; a pulse width modulation controller to control the power stage circuit; a first isolation transformer to convert the first AC power signals into second AC power signals, the first isolation transformer comprising a primary winding connected to the power stage circuit and a secondary winding; a resonance circuit connected between the power stage circuit and the first isolation transformer, the resonance circuit comprising a first inductor, a first capacitor and a second inductor, wherein the first capacitor is electrically connected between the power stage circuit and a first terminal of the first inductor, wherein the second inductor is electrically connected between a second terminal of the first inductor and ground and is connected in parallel with the primary winding of the first isolation transformer; at least two second transformers to either boost or buck the second AC power signals, wherein each of the at least two second transformers comprises a primary winding and a secondary winding, the primary windings of the at least two second transformers are connected to the secondary winding of the first isolation transformer in parallel, and center taps of the secondary windings of the at least two second transformers are grounded; and at least two rectifier circuits, wherein each of the at least two rectifier circuits is connected to two ends of the secondary winding of a corresponding one of the at least two second transformers, to rectify the boosted or bucked second AC power signals to output direct current (DC) power signals to a corresponding one of the plurality of loads.