Patent ID: 6292376
Filing Date: 2001-09-18
Classification: H02M

Abstract:
A switching power supply apparatus comprising:a switching device;a transformer comprising a primary winding connected directly to said switching device and to which a DC current is applied by turning ON and OFF said switching device, and a secondary winding for supplying an output signal to a load;control means connected to said secondary winding and comprising a first flip flop circuit connected to said switching device for turning ON and OFF said switching device, said switching device being turned ON by a control signal obtained from said output signal from said secondary winding, and said switching device being turned OFF by a control signal obtained from said output signal and a reference signal; andgate means connected to said first flip flop circuit of said control means for causing said control means to prolong time interval at which said switching means is turned ON and OFF so that oscillation frequency is suppressed.