Patent ID: 7852648
Filing Date: 2010-12-14
Classification: H02M

Abstract:
1. A power supply control apparatus comprising: a controller for outputting a first pulse width modulation (PWM) signal supplying alternating current (AC) power and a second PWM signal; a first PWM signal input unit for converting the second PWM signal to a direct current (DC) signal; a comparator for comparing the first PWM signal and the converted second PWM signal; a transformer for producing an output voltage being an alternating current (AC) signal according to the comparison of the first PWM signal and the converted second PWM signal; and a rectifier and voltage divider coupled to the transformer for rectifying and voltage-dividing the output voltage of the transformer, wherein the output voltage of the transformer is supplied to a load, and the rectifying and voltage-dividing result is fed back to the controller, wherein the controller adjusts the second PWM signal according to the fed back rectifying and voltage-dividing result in order to reduce a fluctuation of the output voltage of the transformer due to impedance fluctuation of the load.