Precision current limit circuit

Details Precision current limit circuit Precision current limit circuit

1995-03-20

1997-09-23

Elms, Richard T.

Electrical transmission or interconnection systems

Vehicle mounted systems

Automobile

180282, 280735, 327323, B60R 2132

Patent

active

056708297

ABSTRACT:
A current limit circuit (10) uses a reference current (28) with zero temperature coefficient. A feedback loop (18, 26, 22) maintains substantially equal V.sub.GS for first (22) and second (24) transistors. The reference current sets the current through the first transistor which therefore limits the current in the second transistor. The second transistor is a power device that supplies current to a squib detonation device (38) in automotive air bag application.

REFERENCES:
patent: 5018041 (1991-05-01), Szepesi
patent: 5135254 (1992-08-01), Masegi et al.
patent: 5159516 (1992-10-01), Fujihira
patent: 5204547 (1993-04-01), Schumacher et al.
patent: 5309030 (1994-05-01), Schultz

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