Patent ID: 6847195

Claim:
An auxiliary circuit for a power factor corrector having self-power supplying and zero current detection mechanisms comprising: a converter including a primary winding, a secondary winding, and other circuits and components; a power supply circuit including a filter capacitor electrically coupled to one side of the secondary winding; a zero current detector (ZCD) circuit including at least two resistors each having one end electrically coupled to positive and negative terminals of the filter capacitor; a power factor corrector (PFC) including a ZCD pin electrically coupled to the ZCD circuit, a power supply pin electrically coupled to the power supply circuit, and a plurality of other pins electrically coupled to the other circuits and components of the converter; and a toggle latch electrically coupled to one pin of the PFC and the primary winding respectively for switching in response to a trigger signal sent from the pin, wherein the other end of each of the resistors is electrically coupled to the ZCD pin.