Patent ID: 7245088
Filing Date: 2007-07-17
Classification: H02M,H05B,Y02B,Y10S

Abstract:
1. A power control circuit comprising: an LC circuit adapted to be connected to a load and adapted to output an output voltage to the load; a power switch unit connected to said LC circuit, adapted to be connected to an external power source for receiving an input voltage therefrom, and operable so as to enable and disable supply of the input voltage from the external power source to said LC circuit, said power switch unit having a control input unit; a voltage detecting unit for detecting the output voltage applied to the load and for generating a first voltage signal in accordance with the output voltage applied to the load; a current detecting unit for detecting a current flowing through said power switch unit and for generating a second voltage signal in accordance with the current flowing through said power switch unit; a comparator for comparing a summation of the first and second voltage signals with a reference voltage and for outputting a pulse width modulation signal in accordance with a comparison result between the summation of the first and second voltage signals and the reference voltage; and a driver connected electrically to said control input unit of said power switch unit and said comparator, said driver receiving the pulse width modulation signal from said comparator and outputting a driving signal to said control input unit of said power switch unit so as to control a duty cycle of said power switch unit, thereby controlling rated power supplied to the load to correspond to the reference voltage.