Circuit for determining the travel (displacement) of a core, which can be displaced in a coil, by measuring the inductance

摘要

A circuit for determining the travel of a core, which can be displaced in a coil 1, by measuring the travel-dependent inductance of the coil 1 has a timer, a switch 2 upstream of the coil, and a capacitor 5, downstream of the coil, as well as a trigger 20, of which one input is connected between the coil 1 and capacitor 5 and of which the other input is connected to a voltage divider 21. In order to measure the charging and/or discharging time of the coil 1 and of the capacitor 5, two series-connected resistors 8, 9 are provided in parallel with the coil 1. A discharging switch 11 for discharging the coil 1 and the capacitor 5 is connected between the two resistors 8, 9. <IMAGE>