Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent
1996-10-04
1999-02-16
Ballato, Josie
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
280735, G01R 3126, B60R 2132
Patent
active
058724605
ABSTRACT:
The firing circuit of an inflatable restraint system is tested to verify operation of two FETs in series with a squib which are used to apply current to the squib. For the test the squib is biased to an intermediate voltage and each FET is turned on alone to apply battery or ground voltage to the squib. High and low voltage detectors sense the voltage excursion past respective thresholds to verify FET operation. A current detector for each FET senses a short when its FET is conducting, and a logic circuit immediately turns off the FET to result in a very brief FET on time. In addition, the voltage detectors may be used to detect shorts prior to FET testing and also to turn off or hold off the FETs when a high or low voltage is detected upon FET testing.
REFERENCES:
patent: 5409258 (1995-04-01), Kawabata
patent: 5621326 (1997-04-01), Watanabe et al.
patent: 5656991 (1997-08-01), Hargenrader et al.
patent: 5659474 (1997-08-01), Maeno et al.
patent: 5666065 (1997-09-01), Ravas et al.
Anderson Terrell
Bennett Paul T.
Constable Robert Keith
Gray Randall C.
Ravas Richard Joseph
Ballato Josie
Delco Electronics Corp.
Funke Jimmy L.
Kobert Russell M.
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