Supply voltage switching circuit

Details Supply voltage switching circuit Supply voltage switching circuit

2005-12-15

2009-08-18

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

C327S530000, C307S080000

Reexamination Certificate

active

07576600

ABSTRACT:
A supply voltage switching circuit for a computer includes a chipset, a first transistor and a second transistor. The chipset includes a first MOSFET and a second MOSFET. A 5V system voltage and a 5V standby voltage are respectively inputted to sources of the first MOSFET and the second MOSFET. Gates of the first MOSFET and the second MOSFET are respectively coupled to collectors of the first transistor and the second transistor. Emitters of the first transistor and the second transistor are coupled to a first terminal for receiving a control signal. A 1.8V standby voltage is separately inputted to bases of the first transistor and the second transistor. A 12V system voltage and the 5V standby voltage are respectively inputted to collectors of the first transistor and the second transistor. A second terminal is connected between the drain of the first MOSFET and the drain of the second MOSFET.

REFERENCES:
patent: 4694430 (1987-09-01), Rosier
patent: 5457414 (1995-10-01), Inglis et al.
patent: 5517153 (1996-05-01), Yin et al.
patent: 7215043 (2007-05-01), Tsai et al.

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