Patent ID: 6288914
Filing Date: 2001-09-11
Classification: H02M,Y02B

Abstract:
A switching power source comprising a switching transformer, first rectifying and smoothing means provided on a primary side of said switching transformer for rectifying and smoothing an input A.C. voltage to obtain a first D.C. voltage, a switching element provided on said primary side of said switching transformer for supplying the first D.C. voltage to said primary side of said switching transformer while ON/OFF controlling the first D.C. voltage, second rectifying and smoothing means for rectifying and smoothing a second A.C. voltage to obtain a second D.C. voltage and supplying the second D.C. voltage to a load, comparator means for comparing the first D.C. voltage with a reference voltage and control means for detecting a state of said load and intermittently controlling an oscillation for a switching operation of said switching element correspondingly to an output of said comparator means when said load is light.