Patent ID: 8130520
Filing Date: 2012-03-06
Classification: H02M,Y02B

Abstract:
1. A power supply apparatus comprising: a power supply unit for boosting an AC input power source and outputting the boosted power source as DC output voltage; and a power factor correction (PFC) controller for controlling a switching transistor provided for the power supply unit to suppress a harmonic current, wherein the power supply unit has a feedback/resistor for detecting feedback voltage of output voltage used when the PFC controller controls the switching transistor so that the output voltage becomes constant, wherein the PFC controller has: wherein the lower the detected load level is, the more the current correction controller increases a current value of the correction current and supplies the current value to the feedback resistor to decrease the output voltage generated by the power supply unit, wherein the current correction controller comprises: wherein the load detector is an error amplifier for comparing the feedback voltage detected by the feedback resistor with a reference voltage and outputting an error signal.