Patent ID: 7408384
Filing Date: 2008-08-05
Classification: G06F,H03K

Abstract:
1. A drive circuit of a computer system for driving a mode indicator, the computer system comprising a control chip with a first port and a second port, the mode indicator comprising a first receiving end and a second receiving end, the drive circuit comprising: a first input end adapted to connect to the first port; a second input end adapted to connect to the second port; a first output end adapted to connect to the first receiving end; a second output end adapted to connect to the second receiving end; a first power supply and a second power supply, the second power supply connected to the first input end and the second input end via a first resistor and a second resistor respectively; a first transistor having a base connected to the first input end, a collector connected to the first output end and the first power supply respectively, and an emitter connected to the ground; and a second transistor having a base connected to the second input end, a collector connected to the second output end and the first power supply respectively, and an emitter connected to the ground, wherein the first input end can receive a working signal from the first port of the control chip, and the second input end can receive a sleeping signal from the second port of the control chip, the first power supply is adapted to receive a 5V voltage, the second power supply is adapted to receive a 3V voltage.