Patent ID: 8659442
Filing Date: 2014-02-25
Classification: G06F

Abstract:
1. A power-saving reminder circuit for a computer with a motherboard, the power-saving reminder circuit comprising: a light emitting diode (LED) comprising a cathode and an anode, wherein the anode of the LED is connected to a first power source of the motherboard; a counter chip comprising an output pin, a voltage pin, a reset pin, a trigger pin, a gate pin, and a discharge pin; a first electrical switch comprising first to third terminals, the first terminal of the first electrical switch is connected to a second power source of the motherboard, the third terminal of the first electrical switch is grounded, the second terminal of the first electrical switch is connected to the cathode of the LED and also connected to the output pin of the counter chip; a second electrical switch comprising first to third terminals, wherein the first terminal of the second electrical switch is connected to a suspend signal pin of the motherboard, the third terminal of the second electrical switch is grounded, the second terminal of the second electrical switch is connected to the first power source of the motherboard through a first resistor; and a third electrical switch comprising first to third terminals, wherein the first terminal of the third electrical switch is connected to the second terminal of the second electrical switch, the second terminal of the third electrical switch is connected to the first power source of the motherboard, the third terminal of the third electrical switch is grounded through a second resistor, a third resistor, and a first capacitor connected in series and also connected to the voltage pin of the counter chip, the reset pin of the counter chip is connected to a node between the voltage pin of the counter chip and the second resistor, the trigger pin and the gate pin of the counter chip are connected to a node between the third resistor and the first capacitor, the discharge pin of the counter chip is connected to a node between the second and the third resistors; wherein when the motherboard is powered on, the first and the second electrical switches are turned on, the third electrical switch is turned off, the counter chip does not work, the LED is lit; and wherein when the motherboard is powered off, the first and the second electrical switches are turned off, the third electrical switch is turned on, the first capacitor charges and discharges to make the counter chip control the LED to turn on and off.