Patent ID: 8156354
Filing Date: 2012-04-10
Classification: G06F,Y02D

Abstract:
1. A power-saving system for a computer, the system comprising: a sensor connected between a standby power pin of the computer and ground, the sensor comprising an sensor output; a first amplifier comprising a first amplifier positive input terminal connected to the sensor output, a first amplifier negative input terminal that is grounded, and a first amplifier output terminal that is grounded via an integrator; first and second resistors connected in series between the standby power pin and ground; a comparator comprising a comparator positive input terminal connected to the integrator, a comparator negative input terminal connected to a node between the first and second resistors, and a comparator output terminal; an electronic switch comprising a first terminal, connected to the comparator output terminal, a second terminal, and a third terminal that is grounded; a micro processing unit comprising a first I/O pin connected to the second terminal of the electronic switch, a second I/O pin connected to a system power pin of the computer, and a third I/O pin connected to the basic input/output system of the computer; and a third resistor connected between the first I/O pin of the micro processing unit and the standby power pin; wherein, when the sensor is capable of sensing a person present within a predetermined distance range in front of a monitor, outputting an alternating current signal to the first amplifier positive input terminal: the amplifier is capable of amplifying the alternating current signal; the integrator is capable of converting the amplified alternating current signal to a direct current signal: the comparator is capable of receiving the direct current signal, and outputting a level signal after comparing signals at the comparator positive and negative input terminals, turning on the electronic switch; the first terminal of the electronic switch is capable of outputting a low level signal to the first I/O pin of the micro processing unit, the sensor is also capable of outputting no signal when no person is sensed, turning off the electronic switch, and the first terminal of the electronic switch is capable of outputting a high level signal to the first I/O pin of the micro processing unit.