Solenoid engagement sensing circuit

Details Solenoid engagement sensing circuit Solenoid engagement sensing circuit

1991-10-07

1993-03-23

Pellinen, A. D.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

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

361160, 361187, 32420716, 32420724, 324654, 324418, 340644, H01H 4732

Patent

active

051969831

ABSTRACT:
A shutter, positioned between an electronic imaging device (such as a laser printer) and a film processor, is actuated by a solenoid which is driven by a driver network which isolates the solenoid coil when it is deactuated. If, after deactuation, a jam occurs, such that the shutter does not close completely, the jam is detected by a solenoid engagement sensing circuit. The sensing circuit includes a function generator, an operational amplifier having the solenoid coil connected between its input and output, an envelope detector and a comparator. The comparator produces a jam signal in response to an increase in the voltage detected by the presence of the solenoid plunger within the solenoid coil.

REFERENCES:
patent: 4851959 (1989-07-01), Stumpf
patent: 4950985 (1990-08-01), Voss et al.
patent: 4970622 (1990-11-01), Buchl
patent: 4981173 (1991-01-01), Perkins et al.
patent: 5053911 (1991-10-01), Kopec et al.

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