Patent ID: 8525501
Filing Date: 2013-09-03
Classification: G05F

Abstract:
1. A power factor correction device comprising: a rectifier, for converting an alternating current (AC) input voltage into a direct current (DC) input voltage; an output module, for generating and outputting a DC output voltage; an intermediate inductor, coupled between the rectifier and the output module; a power switch, comprising a first end coupled between the intermediate inductor and the output module, a second end coupled to a resistor, and a third end, for determining whether the first end is electrically connected to the second end according to signals received by the third end; a reset module, comprising a first input end coupled between the rectifier and the intermediate inductor, a second input end coupled to the output module, and a third input end coupled to the second end of the power switch, for generating a reset instruction according to the DC input voltage, the DC output voltage and a voltage of the second end of the power switch; a set/reset (SR) flip-flop, comprising a set end, a reset end coupled to the reset module, and an output end coupled to the third end of the power switch, for outputting a latch result from the output end according to signals received by the set end and the reset end; and a set module, for generating a set instruction sent to the set end of the SR flip-flop according to variation of an inductor current of the intermediate inductor or variation of the latch result; wherein the set module comprises: