SOLENOID TRANSIENT VARIABLE RESISTANCE FEEDBACK FOR EFFECTER POSITION DETECTION

摘要

Feedback from a solenoid is achieved by adding at least one variable resistance in parallel with the solenoid current feedback circuit for position detection. The resistance has current flowing therethrough when a switching device actuated by the solenoid is in one position or transitions from one position to at least one other position. A feedback current may be measured in the current feedback circuit and the position of the switching device in response to actuation thereof by the solenoid may be determined from the measured feedback current.

主权项

1. A switching device position detection system comprising:
a solenoid adapted to generate mechanical energy from an energizing current supplied thereto; a switching device coupled to the solenoid and adapted to be driven by the mechanical energy to move between a first position and at least one second position; at least one measuring element coupled to the switching device, the at least one measuring element adapted to be engaged by the switching device and to have a measuring current flowing therethrough when the switching device moves to the at least one second position; and a solenoid driver coupled to the solenoid and to the at least one measuring element and adapted to supply the energizing current to the solenoid, to detect the measuring current, and to determine on the basis of detection of the measuring current whether the switching device has moved to the at least one second position.