Electrical transmission or interconnection systems – Plural supply circuits or sources – Selective or optional sources
Reexamination Certificate
2011-06-14
2011-06-14
Fureman, Jared J (Department: 2836)
Electrical transmission or interconnection systems
Plural supply circuits or sources
Selective or optional sources
Reexamination Certificate
active
07960864
ABSTRACT:
Switching power supplies are implemented using a variety of methods and devices. According to an example embodiment of the present invention, an arrangement provides power to a circuit by selecting between a first supply and a second supply. The arrangement includes a first circuit that charges a first capacitive element using the first supply and generates a first reference voltage by distributing charge between the first capacitive element and a second capacitive element. The arrangement also includes a first comparator that compares the first reference voltage to a second reference voltage derived from the second supply and a second comparator that compares the first reference voltage to a third reference voltage. The arrangement further includes a power control circuit that selects one of the supplies based on the results of the comparisons.
REFERENCES:
patent: 5440263 (1995-08-01), Fournel et al.
patent: 6268711 (2001-07-01), Bearfield
patent: 6411069 (2002-06-01), Hollmer
patent: 2001/0026226 (2001-10-01), Andersson et al.
patent: 2004/0217653 (2004-11-01), Neidorff
Genna Giovanni
Riedel Friedbert
Amaya Carlos
Fureman Jared J
NXP B.V.
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