Patent ID: 9184656
Filing Date: 2015-11-10
Classification: H02M,Y02B,Y02P

Abstract:
1. A switching power supply comprising: a power factor correction converter that switches an input AC voltage and delivers a DC voltage; and a DC-DC converter that switches the output voltage of the power factor correction converter and delivers a specified DC output voltage to a load; wherein the DC-DC converter comprises a load condition detecting means for detecting a condition of the load, and a frequency reducing means for reducing a switching frequency in the DC-DC converter when a light load condition is detected by the load condition detecting means; the power factor correction converter comprises a frequency reducing means for reducing a switching frequency in the power factor correction converter corresponding to the load condition detected by the load condition detecting means of the DC-DC converter; the frequency reducing means of the power factor correction converter and the frequency reducing means of the DC-DC converter are each composed of a bottom skip control means that delays a turning ON timing of a respective switching element provided in the power factor correction converter and in the DC-DC converter; and the load condition detecting means comprises a load information delivering means for delivering bottom skip control information corresponding to the load condition to the power factor correction converter.