Electronic device disconnect circuit

Details Electronic device disconnect circuit Electronic device disconnect circuit

1999-03-05

2000-10-17

Paladini, Albert W.

Electrical transmission or interconnection systems

Vehicle mounted systems

307127, 361 84, 429 1, H02H 718

Patent

active

061336459

ABSTRACT:
An electronic disconnect circuit protects an electronic device, such as a radio, installed in a motor vehicle from overvoltage condition in which the normal internal protection is inadequate. A normally closed relay includes 2 sets of terminals connected in the ground conductor and in the voltage conductor of the power cable connected to the electronic device. The relay coil is connected through a diode which becomes conductive if the voltage in the ground conductor rises above the voltage in the other conductor, thus protecting the radio or similar electronic device from a reversal of polarity as would occur when a battery charger or similar device is improperly connected to the vehicle. A switching transistor responds to an over voltage condition to turn on the relay coil when an over voltage condition occurs, such as during a high voltage jump start or a high voltage transient condition.

REFERENCES:
patent: 3858104 (1974-12-01), Grob
patent: 4209816 (1980-06-01), Hansen
patent: 5359486 (1994-10-01), Crane et al.
patent: 5683827 (1997-11-01), Yu

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