Low voltage power tap on high voltage stack

Chemistry: electrical current producing apparatus – product – and – Fuel cell – subcombination thereof – or method of making or... – Electrical current collector

Reexamination Certificate

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C429S452000, C429S517000

Reexamination Certificate

active

07972749

ABSTRACT:
A fuel cell system that includes a fuel cell stack providing high voltage power. A tap is electrically coupled to the positive end of the stack to provide a positive voltage output terminal of the fuel cell stack, and a tap is electrically coupled to the negative end of the stack to provide a negative output terminal of the fuel cell stack. A low voltage tap is electrically coupled to one or more intermediate bipolar plates of the stack to provide low voltage power. Several intermediate taps can be electrically coupled to the bipolar plates, where a center intermediate tap is designated a reference potential tap. A switching network switches the several voltage potentials to provide an AC signal.

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patent: 5642275 (1997-06-01), Peng et al.
patent: 6496393 (2002-12-01), Patwardhan
patent: 6677066 (2004-01-01), Jansen et al.
patent: 2003/0091884 (2003-05-01), Scartozzi
patent: 2005/0042492 (2005-02-01), Kato et al.
patent: 2005/0048335 (2005-03-01), Fields et al.
patent: 2006/0055246 (2006-03-01), Jansen et al.
patent: WO 99/67869 (1999-12-01), None

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