Patent ID: 8250388
Filing Date: 2012-08-21
Classification: G06F,H02M

Abstract:
1. A power supply circuit for supplying power to a Central Processing Unit (CPU), the power supply circuit comprising: a Pulse-Width Modulation (PWM) controller capable of outputting a PWM signal; a driving Integrated Circuit (IC) connected to the PWM controller and capable of outputting a first driving signal and a second driving signal according to the PWM signal; a first transistor connected to the driving IC and controlled by the first driving signal; a second transistor connected to the driving IC and controlled by the second driving signal; a voltage regulator, connected to the driving IC, capable of regulating a voltage of a power source to an optimized voltage, and supplying the driving IC with the optimized voltage; wherein the driving IC comprises a first operational amplifier and a second operational amplifier; the first operational amplifier has a first driving signal output terminal configured to output the first driving signal to the first transistor, an upper terminal, and a lower terminal; a first capacitor and a resistor is connected in series between the upper terminal and the lower terminal; the second operational amplifier has a second driving signal output terminal configured to output the second driving signal to the second transistor; and the second operational amplifier is connected to an output terminal of the voltage regulator to receive the optimized voltage; and the upper terminal of the first operational amplifier is connected to the power source via a diode, an anode of the diode is connected to the power source, and a cathode of the diode is connected to the upper terminal of the first operational amplifier.