Patent ID: 7343503
Filing Date: 2008-03-11
Classification: G06F,H02M

Abstract:
1. A system for supplying an operating voltage to a Center Processing Unit (CPU) comprising: a power supply for supplying an original voltage to the CPU; a Pulse Width Modulation (PWM) controller for converting the original voltage to an operating voltage suitable for the CPU, the PWM controller comprising a Vcc pin for receiving power from the power supply, a UGATE pin connected to a gate of a first transistor, an LGATE pin connected to a gate of a second transistor, a drain of the first transistor connected to the power supply, a source of the first transistor connected to a drain of the second resistor, a source of the second resistor being grounded, a node between the source of the first resistor and the drain of the second resistor acting as an output terminal of the PWM controller and connected to the CPU; a feedback circuit connected between the output terminal and an FB pin of the PWM controller for feeding an output signal of the PWM controller back to the PWM controller, the feedback circuit comprises at least one resistor, and a thermistor connected in parallel with said at least one resistor for equalizing resistance changing of said at least one resistor.