Switched capacitor circuit for firing vehicle airbag squibs

Details Switched capacitor circuit for firing vehicle airbag squibs Switched capacitor circuit for firing vehicle airbag squibs

1997-08-06

1999-08-10

Elms, Richard T.

Electrical transmission or interconnection systems

Vehicle mounted systems

Automobile

180282, 280735, B60R 2132

Patent

active

059363134

ABSTRACT:
A switched capacitor circuit for delivering electrical triggering energy to an airbag squib of a supplemental restraint system for a vehicle, or a plurality of such airbag squibs, employs a switching arrangement on both sides of the airbag squib. An energy storage element, which may be a capacitor having stored therein a quantum of energy sufficient to fire the airbag squibs is coupled thereto by a substantially series pair of electronic switches connecting each terminal of the storage capacitor to each terminal of the airbag squib arrangement. A further capacitor is coupled across the airbag squib arrangement, electrically intermediate of the substantially series pairs of electronic switches. A still further capacitor is coupled across the airbag squib arrangement itself. This arrangement can withstand plural short-circuit false conditions, including short-circuits to ground or to supply potential at the terminals of the airbag squib arrangement itself. There is additionally provided a switching arrangement for implementing a predetermined priority of firing of a plurality of airbag squibs and reconfiguring electrically the plurality of airbag squibs.

REFERENCES:
patent: 5158323 (1992-10-01), Yamamoto et al.
patent: 5554890 (1996-09-01), Kiroshita
patent: 5646454 (1997-07-01), Mattes et al.
patent: 5668528 (1997-09-01), Kitao et al.
patent: 5734317 (1998-03-01), Bennett et al.

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