Solenoid driver circuit

Details Solenoid driver circuit Solenoid driver circuit

1996-10-16

1998-05-05

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Systems for magnetizing, demagnetizing, or controlling the...

361187, 361203, H01H 900

Patent

active

057484317

ABSTRACT:
An electrical circuit applies an oscillatory electrical current to a coil of a solenoid in order to cause the solenoid to move in response to a command signal. The circuit includes a signal divider for generating an upper peak current signal value from the command signal and a lower peak current signal value which is a fixed percentage of the upper peak current signal value. A current sense resistor generates a current sense voltage representing current through the coil. A first comparator compares the current sense voltage to the upper current signal value. A second comparator compares the current sense voltage to the lower current signal value. A set/reset flip-flop latches a current driver on and off. A current driver applies a driving current to the solenoid coil as a function of output signals generated by the first and second comparators so that the coil current will have a lower peak current value which is substantially a fixed percentage of the upper peak current value.

REFERENCES:
patent: 4295177 (1981-10-01), Woodhouse et al.
patent: 4764840 (1988-08-01), Petrie et al.
patent: 4817499 (1989-04-01), Bellanger et al.
patent: 4825333 (1989-04-01), Clive et al.
patent: 4930040 (1990-05-01), Binarsch et al.
patent: 4964014 (1990-10-01), Boe et al.
patent: 5075568 (1991-12-01), Bilotti et al.

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