Solenoid response detector

Details Solenoid response detector Solenoid response detector

1992-01-13

1993-12-14

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

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

361159, 361171, 361186, 361195, H01H 4722

Patent

active

052709000

ABSTRACT:
An apparatus for energizing the coil of, and detecting the resultant armature actuation in, a solenoid of the type having a movable armature reciprocable along an axis between first and second positions, a spring bias normally biasing the armature toward the first position, and an actuating coil for inducing a force on the armature tending to move the armature from the first position toward the second position in response to current flow in the actuating coil. A voltage is first provided to the solenoid coil and thereafter, a resulting current flow is differentiated and a zero crossing comparator is utilized to determine when the differentiated current is zero and, therefor, the time at which the sensed current flow reaches a maximum (dv/dt=0). The time at which the armature began to move in response to the resulting coil current may be inferred and the voltage to the solenoid coil interrupted a Predetermined time after the time at which the armature began to move.

REFERENCES:
patent: 4490771 (1984-12-01), Huber et al.
patent: 4631627 (1986-12-01), Morgan
patent: 4810952 (1989-03-01), Cohen
patent: 4845420 (1989-07-01), Oshizawa et al.

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