Patent ID: 8254149
Filing Date: 2012-08-28
Classification: H02M

Abstract:
1. A power supply module configured for converting an input alternating current (AC) voltage to a first direct current (DC) voltage and applying the first DC voltage to a load, the power supply module comprising: an AC/DC converter for converting the input AC voltage to a primary DC voltage; a voltage transforming circuit for transforming the primary DC voltage to the first DC voltage; a feedback circuit for sampling the first DC voltage to generate a first voltage and a second voltage, a feedback voltage being defined by subtracting the second voltage from the first voltage, the feedback circuit further generating a feedback signal according to the feedback voltage; and a detecting circuit for generating a third voltage according to the first DC voltage; wherein a difference voltage is defined by subtracting the third voltage from the second voltage, when the difference voltage reaches a second predetermined value, the second voltage is reduced, the feedback voltage is increased, the feedback circuit increases a magnitude of the feedback signal according to the increased feedback voltage, the voltage transforming circuit maintains the first DC voltage at a first predetermined value according to the feedback signal.