Patent ID: 8269549

Claim:
A power supply circuit for a PCI-E slot comprising: a control chip, wherein the control chip determines the status of a motherboard, outputting a control signal; a first electronic switch including a first terminal, a second terminal, and a third terminal, wherein the first terminal is connected to the control chip to receive the control signal and connected to a 3.3V dual power supply of the motherboard through a first resistor, the second terminal is grounded, the third terminal is connected to the 3.3V dual power supply through a second resistor; and a second electronic switch including a first terminal, a second terminal, and a third terminal, wherein the third terminal of the first electronic switch is further connected to the first terminal of the second electronic switch, the second terminal of the second electronic switch is connected to the 3.3V dual power supply, the third terminal of the second electronic switch is connected to a PCI-E slot.