Patent ID: 9231480
Filing Date: 2016-01-05
CPC Classification: H02M,H05K,Y02B

Claim Text:
1. A power supply device comprising: a main unit including a primary circuit board, a transformer that is disposed on said primary circuit board and that includes a primary coil and a secondary coil, a primary-side circuit that is disposed on said primary circuit board and that is electrically coupled to said primary coil of said transformer, a secondary-side circuit that is disposed on said primary circuit board and that is electrically coupled to said secondary coil of said transformer; and a power switching module including a separate printed circuit board (PCB) that is formed with at least two connection pads and at least two conductive tracks, and at least one power switching element that is disposed on said printed circuit board and that has at least two terminals respectively connected to said two connection pads through said two conductive tracks, wherein said power switching module is in the form of a separate PCB that is electrically connected to said one of said primary- and secondary-side circuits through said two connection pads; wherein said secondary-side circuit includes an output filter circuit capable of filtering out ripples in a direct-current (DC) voltage, said power switching element module including two power switching elements, and further including two driving circuits disposed on said printed circuit board and coupled electrically and respectively to said power switching elements, and two snubbers disposed on said printed circuit board and coupled electrically and respectively to said power switching elements; and wherein said power switching module is electrically coupled between said secondary coil of said transformer and said output filter circuit for synchronously rectifying an alternating-current (AC) voltage induced at said secondary coil into a direct-current (DC) voltage to be subsequently outputted to said output filter circuit.