Switching Power Supply

Abstract: A power supply comprising: a converter transformed having primary and secondary windings loosely coupled to one another, and an auxiliary winding with a predetermined number of turns wound contiguously from one end of said primary winding to an end portion of said converter transformer; an input voltage smoothing capacitor having one side there of connected to an end of said primary winding of said converter transformer through a forwardly directed diode; a switching element connected to the other end of said primary winding of said converter transformer; control means for controlling said switching element to perform switching so that an output voltage of said secondary winding has a predetermined voltage value; and a second capacitor coupled across opposite ends of said auxiliary winding via said forwardly directed diode, to boost-up voltage applied to said converter transformer.

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