Non-contact proximity switch

Details Non-contact proximity switch Non-contact proximity switch

1986-12-24

1988-09-13

Hix, L. T.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361180, H01H 4712, H01H 4728

Patent

active

047713593

ABSTRACT:
A non-contact proximity switch with an oscillation circuit (L 1, C 1) which is activated in a step-like manner, has a reference voltage source (6) which produces at least one reference voltage level (U.sub.ref) and has at least one comparator (5) which compares the amplitude of the transient response with the associated reference voltage level (U.sub.ref) in order to be able to detect at least one value that is distinctive for the time curve of the decaying oscillation from at least one transient response of the oscillation circuit (L 1, C 1) after such an activation. At least one counter (7, 10) counts, at least within a portion of the decay period of the transient response, the number (DA) of the half-waves of the transient response, the peak of which deviated from the associated reference voltage level (U.sub.ref) in one of the two directions.

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