Power supply circuit

Details Power supply circuit Power supply circuit

2011-08-02

2011-08-02

Patel, Rajnikant B (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C363S095000, C713S300000

Reexamination Certificate

active

07990124

ABSTRACT:
A power supply circuit for a motherboard includes a VRM, a first NMOS transistor, a second NMOS transistor, a first capacitor, a first induction coil, and a delay circuit. A gate of the first NMOS transistor is connected to a UGATE pin of the VRM. A source of the first NMOS transistor is connected to a BOOT pin of the VRM via the first capacitor and a PHASE pin of the VRM, and connected to an MCH on the motherboard via the first induction coil. A drain of the first NMOS transistor is connected to a system power. A gate of the second NMOS transistor is connected to an LGATE pin of the VRM. A source of the second NMOS transistor is grounded. A drain of the second NMOS transistor is connected to the source of the first NMOS transistor and the delay circuit.

REFERENCES:
patent: 6891764 (2005-05-01), Li
patent: 7426123 (2008-09-01), Leung et al.
patent: 7640455 (2009-12-01), Leung et al.
patent: 7710089 (2010-05-01), Kohout et al.
patent: 2009/0179625 (2009-07-01), Liu
patent: 2009/0180303 (2009-07-01), Liu

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