Patent ID: 7990124
Filing Date: 2011-08-02
Classification: G06F,H02M

Abstract:
1. A power supply circuit, comprising: a voltage regulator module (VRM) comprising a BOOT pin, an upper gate drive output (UGATE) pin, a lower gate drive output (LGATE) pin, and a PHASE pin; a pulse width modulation (PWM) controller capable of providing a PWM signal; a first capacitor capable of storing power; a first induction coil capable of shunting current and filtering wave; a delay circuit; a first transistor, comprising: a second transistor, comprising: wherein the VRM receives the PWM signal from the PWM controller; wherein the first control signal output from the UGATE pin of the VRM is at a high voltage level upon the condition that the PWM signal is at a high voltage level, and the first transistor is turned on; wherein the second control signal output from the LGATE pin of the VRM is at a high voltage level upon the condition that the PWM signal is at a low voltage level, and the second transistor is turned on; thereby the first transistor and the second transistor are turned on in alternating manner controlled by the VRM and the PHASE pin of the VRM provides a voltage signal for the MCH via the delay circuit and the first induction coil.