Circuit for detecting the state of a switch, in particular a car

Details Circuit for detecting the state of a switch, in particular a car Circuit for detecting the state of a switch, in particular a car

1992-03-10

1994-03-15

Hickey, R. J.

Electricity: single generator systems

Automatic control of generator or driving means

Voltage of generator or circuit supplied

322 99, H02J 714, H02J 906

Patent

active

052948811

ABSTRACT:
A circuit for detecting the state of a switch, in particular the state of a key contact for activating a regulator circuit for regulating the voltage at which a battery is charged by an alternator, in which a first terminal of the key switch is connected to a DC source and a second terminal of the key switch is connected to the regulator circuit via a load such as a warning lamp, said load being switched ON and OFF by means of a component having a voltage drop. The detection circuit is wherein it comprises amplifier means receiving a reference voltage on a first terminal, and on a second terminal the voltage present on a terminal of the load opposite from its terminal connected to the key switch, the amplifier means being designed to regulate the voltage drop to the value of the reference voltage so long as the key switch and the component having the voltage drop are conductive, and including means for generating a first signal on a key switch state detection output whenever said voltage present on the terminal is less than the reference voltage and for generating a second signal on said detection output whenever said voltage present on the terminal is greater than the reference voltage or whenever said amplifier means is regulating.

REFERENCES:
patent: 4056765 (1977-11-01), Scheidler et al.
patent: 4488105 (1984-12-01), Papazian

Affiliated with

Also associated with

Rating

Circuit for detecting the state of a switch, in particular a car does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Circuit for detecting the state of a switch, in particular a car, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit for detecting the state of a switch, in particular a car will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1538261