Load driver and system with fault detection apparatus for provid

Details Load driver and system with fault detection apparatus for provid Load driver and system with fault detection apparatus for provid

1991-12-17

1994-04-19

Strecker, Gerard R.

Electricity: measuring and testing

Electromechanical switching device

324418, 361101, 340644, G01R 3102

Patent

active

053049357

ABSTRACT:
Load driver system (10) preferably uses a microprocessor controller (20) to generate write/read signals and command signals received by a circuit at write/read and command/status input terminals (16, 17). The circuit (15) responds to the input signals and controls a semiconductor switch (11) that controls the operative state of a load (14). The circuit (15) includes a load shorted high detector (28), a load shorted low detector (29) and a load open detector (30) which are used to detect various faults and provide a predetermined sequence of logic states at the command/status input terminal (17) during read cycles implemented by the controller (20). Thus one input line (terminal 17) is used to both send commands to the semiconductor switch (11) and receive a sequence of logic states indicative of various fault modes. This permits the controller to determine which of several types of faults, if any, has occurred, while minimizing the number of controller-circuit interconnections.

REFERENCES:
patent: 4319193 (1982-03-01), Boccali et al.
patent: 4736267 (1988-04-01), Karlmann et al.
patent: 4918564 (1990-04-01), Walker et al.
patent: 4932246 (1990-06-01), Deutsch et al.
Robert W. Deutsch, Motorola Technical Developments, vol. 3, "Injector Fault Testing Methods", Mar. 1983, pp. 47-52

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