Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1990-05-09
1992-04-28
Pellinen, A. D.
Electrical transmission or interconnection systems
Switching systems
Condition responsive
361 84, 320 25, H02H 318
Patent
active
051091623
ABSTRACT:
The subject invention provides a coil driver circuit having protection against a reverse-polarity battery connection and is suitable for use in such control modules. The driver circuit controllably actuates N coils in response to control signals supplied by the control module. The driver circuit includes N control switches, each coupled in series between a first terminal of an associated one of the coils and a first common junction. The first common junction is normally connected to a positive reference terminal of the electrical power source. The control switches are adapted to controllably connect the coil first terminals to the power source positive reference terminal in response to externally supplied control signal. The coils have second terminals connected at a second common junction, and the second common junction is normally connected to a negative reference terminal of said power source. N flyback diodes, each having a cathode connected to a respective coil first terminal and an anode connected to a third common junction. The third common junction is normally connected to the power source negative reference terminal. A circuit is provided for sensing a reverse-polarity battery connection and responsively disconnecting the diodes from the third junction.
REFERENCES:
patent: 4679112 (1987-07-01), Craig
patent: 4924122 (1990-05-01), Harris
patent: 4949215 (1990-08-01), Studtmann et al.
patent: 4967309 (1990-10-01), Hoffman
patent: 4992683 (1991-02-01), Robin, Jr.
Koch Daniel S.
Lueckenbach William H.
Wood Daniel C.
Caterpillar Inc.
Elms Richard
Pellinen A. D.
Vander Leest Kirk A.
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