Method and apparatus for controlling an electromagnetic switchin

Details Method and apparatus for controlling an electromagnetic switchin Method and apparatus for controlling an electromagnetic switchin

1997-03-26

1999-03-09

Fleming, Fritz

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361152, 361160, H01H 4702

Patent

active

058809201

ABSTRACT:
A method and an apparatus for controlling an electromagnetic switching member having an excitation winding and a movable armature. A first time point and a second time point define a time window. Within the time window, the current characteristic and/or the voltage characteristic is evaluated in order to detect a switching time point at which the armature reaches a new limit position. The time window is enlarged if no reliable switching time point was detected within the time window.

REFERENCES:
patent: 4653447 (1987-03-01), Linder et al.
patent: 4970622 (1990-11-01), Buechl
patent: 5053911 (1991-10-01), Kopec et al.
patent: 5592921 (1997-01-01), Rehbichler

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