Vehicle security system siren with backup rechargeable battery

Details Vehicle security system siren with backup rechargeable battery Vehicle security system siren with backup rechargeable battery

1995-02-02

1996-10-08

Hofsass, Jeffery

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340426, 340636, 307 66, 320 21, 320 48, 320 61, B60Q 100

Patent

active

055635768

ABSTRACT:
A vehicle security siren that includes a rechargeable back-up battery and an electronic circuit that minimizes current drain from the vehicle's battery by controlling the rate at which the siren's back-up battery is charged by the vehicle's battery. The circuit charges the siren's battery at a relatively high rate when the vehicle engine is running or the ignition is on, and by a low charging rate at other times. This multi-level charging rate preserves the vehicle's battery charge particularly if the vehicle is not driven for any extended time period. The circuit includes a back-up battery condition detector that issues a warning signal in the event of failure of the back-up battery. The circuit also limits the maximum siren duration in the event that either the vehicle's battery or the security system is disconnected from the siren.

REFERENCES:
patent: 3795818 (1974-03-01), Beaman
patent: 4006450 (1977-02-01), Ofenleger
patent: 4006451 (1977-02-01), Nobile
patent: 4754255 (1988-06-01), Sanders et al.
patent: 4761631 (1988-08-01), Hwang
patent: 4887064 (1989-12-01), Drori et al.
patent: 4922224 (1990-05-01), Drori et al.
patent: 4929931 (1990-05-01), McCuen
patent: 4990885 (1991-02-01), Irick et al.
patent: 5157375 (1992-10-01), Drori

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