Circuit and method of detecting actuator movement

Details Circuit and method of detecting actuator movement Circuit and method of detecting actuator movement

1994-09-06

1995-08-15

Wieder, Kenneth A.

Electrical pulse counters, pulse dividers, or shift registers: c

Systems

Particular input circuit

377 20, 377 241, 73168, 32420711, 324415, 361179, H01H 4700

Patent

active

054426715

ABSTRACT:
An actuator movement detector (10) indicates proper engagement of a solenoid (12). The current flowing through a field coil (16) is converted to a sense voltage that exponentially increases and then follows a dip before increases again to a steady state value greater than the first peak value. The exponentially increasing sense voltage is stored across a capacitor (24). Any AC variation about the stored sense voltage sets the output state of comparators (30, 32) and determines a first peak value of the sense voltage. After the first peak, a counter (44) must count to a predetermined value during the low peak before the sense voltage returns to its first peak value. If the counter reaches at least the predetermined count value before returning to its first peak value and count back down to zero before reaching steady state, then the solenoid is considered engaged.

REFERENCES:
patent: 4851959 (1989-07-01), Stumpf
patent: 5130657 (1992-07-01), Hornung
patent: 5289131 (1994-02-01), Heidt

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