Patent ID: 6713995
Filing Date: 2004-03-30
Classification: G05F,H02M,Y02B

Abstract:
A voltage regulator with pulse width modulation (PWM) in dual frequencies, for use in stabilizing a load voltage of a load, the voltage regulator comprising:a switching device, for adjusting an input current to the load; an error amplifier, coupled to the load, for outputting an error signal according to the load terminal voltage level and a reference voltage level; a dual frequency signal generator, for outputting a high frequency signal and a low frequency signal; a modulation signal generator, coupled to the error amplifier and the dual frequency signal generator, for outputting a modulation signal according to the error signal and the high frequency signal; a load sensing device, coupled to the error amplifier, for determining the loading effect of the load according to the error signal, and outputting a frequency selection signal; an OR operator, wherein the input terminals of the OR operator are respectively coupled to the dual frequency signal generator and the load sensing device, and the OR operator outputs an OR operation signal after an OR logic operation is performed on the low frequency signal and the frequency selection signal; an AND operator, wherein the input terminals of the AND operator are respectively coupled to the modulation signal generator and the OR operator, and the AND operator outputs an AND operation signal after an AND logic operation is performed on the modulation signal and the OR operation signal; and a driving device, coupled to the AND operator and the switching device, for driving the switching device according to the AND operation signal.