Power supply selection/detection circuit

Details Power supply selection/detection circuit Power supply selection/detection circuit

2007-02-21

2011-11-22

Fureman, Jared (Department: 2836)

Electrical transmission or interconnection systems

Plural supply circuits or sources

Connecting or disconnecting

C307S087000

Reexamination Certificate

active

08063514

ABSTRACT:
A power supply selection/detection circuit to select one main power supply from a plurality of external power supplies includes a resistance element with one end connected to an external power supply and another end connected to the main power supply, a first voltage detector to receive a voltage of the external power supply and detect a voltage of the external power supply, a second voltage detector to detect a voltage between the ends of the resistance element, and a switch connected between the external power supply and a ground to short-circuit or open-circuit between the external power supply and the ground according to an output of the second voltage detector. The resistance element and the first voltage detector are disposed for each of the plurality of external power supplies, and the second voltage detector and the switch are disposed for at least one of the plurality of external power supplies.

REFERENCES:
patent: 4492876 (1985-01-01), Colbert et al.
patent: 7024569 (2006-04-01), Wright et al.
patent: 7525291 (2009-04-01), Ferguson
patent: 2005/0063725 (2005-03-01), Matsukura
patent: 11-252917 (1999-09-01), None
patent: 2000-284865 (2000-10-01), None
Japanese Official Action—2006-048547—Aug. 2, 2011.

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