Patent ID: 7576600

Claim:
A supply voltage switching circuit for a computer, the supply voltage switching circuit comprising: a chipset outputting a voltage for the computer, the chipset comprising: a first transistor having a first end connected to a first system voltage, a second end connected to a second system voltage, and a third end; a second transistor having a first end and a second end separately connected to a first standby voltage, a third end connected to the third end of the first transistor; and a node between the third end of the first transistor and the third end of the second transistor outputting the voltage for the computer; a third transistor having a first end connected to the first system voltage and connected to the first end of the first transistor, a second end connected to a second standby voltage, and a third end connected to a control signal from the computer and being grounded via a resistor; and a fourth transistor having a first end connected to the first standby voltage and connected to the first end of the second transistor, a second end connected to the second standby voltage, and a third end connected to the control signal from the computer and being grounded via another resistor.