Automatically switching power supply sources for a clock...

Details Automatically switching power supply sources for a clock... Automatically switching power supply sources for a clock...

2008-05-06

2008-05-06

Cao, Chun (Department: 2115)

Electrical computers and digital processing systems: support

Computer power control

C713S340000

Reexamination Certificate

active

07370214

ABSTRACT:
In one embodiment, a power supply switching circuit may automatically provide power to a clock circuit from one of an auxiliary power supply and a main power supply, based on a voltage of the main power supply. To provide automatic switching, a switch circuit coupled between the power supplies and the clock circuit may be controlled by a voltage detector, in some embodiments.

REFERENCES:
patent: 4617473 (1986-10-01), Bingham
patent: 5341034 (1994-08-01), Matthews
patent: 5517153 (1996-05-01), Yin et al.
patent: 5886561 (1999-03-01), Eitan et al.
patent: 6404081 (2002-06-01), Staffiere
patent: 2006/0214738 (2006-09-01), Sheng et al.
patent: WO 00/38338 (2000-06-01), None
patent: WO 02/073562 (2002-09-01), None
U.S. Appl. No. 60/608,966, filed Sep. 30, 2004 entitled “Controlling the Frequency of an Oscillator” by James P. Maligeorgos and Donald A. Kerth.
PCT/US2006/010472 International Search Report with Written Opinion of the International Searching Authority, mailed Nov. 24, 2006.

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