Apparatus for identifying the position of an element, in particu

Details Apparatus for identifying the position of an element, in particu Apparatus for identifying the position of an element, in particu

1999-01-28

2000-09-05

Jackson, Stephen W.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361180, H01H 4700

Patent

active

061152293

ABSTRACT:
In order to identify the position of a movable element, such as a lock bolt, a resonant circuit is subjected to the element or a part that moves with the element. The resonant circuit is thereby damped by the element in a position-dependent manner and oscillates in one end position of the element but is damped too greatly in the other end position. A microprocessor controls the switching on and the respective operating point of a transistor in such a way that switching hysteresis is obtained. The operating point can be automatically readjusted in an adaptation phase.

REFERENCES:
patent: 4543527 (1985-09-01), Schuchmann et al.
patent: 4968953 (1990-11-01), Kanda et al.

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