Ignition sensor circuit

Details Ignition sensor circuit Ignition sensor circuit

1997-04-14

1999-05-11

Elms, Richard T.

Electrical transmission or interconnection systems

Vehicle mounted systems

Automobile

307 101, 307 108, H02J7/00

Patent

active

059030631

ABSTRACT:
A control circuit comprises a plurality of amplifier and filter stages for detecting ignition noise present on the battery line of a vehicle. It applies the filtered and amplified ignition noise signal to a hysteresis latch circuit for providing a control output signal for a solid-state switch coupled between the vehicle battery conductor and a load. Such a circuit provides accurate detection of only ignition noise to provide operating power from a battery line to a circuit to be powered thereby and is immune from extraneous noise frequencies and voltage levels.

REFERENCES:
patent: 4733100 (1988-03-01), Nusairat et al.
patent: 5073721 (1991-12-01), Terrill et al.
patent: 5130659 (1992-07-01), Sloan
patent: 5204991 (1993-04-01), Law
patent: 5459357 (1995-10-01), Minks
patent: 5510657 (1996-04-01), Morita
patent: 5583485 (1996-12-01), Van Lente et al.

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