SCHALTUNGSANORDNUNG ZUR BEGRENZUNG DER ABSCHALTSPANNUNG AN EINEM STELLMOTOR

摘要

Described is a circuit for limiting the cut-off voltage which occurs when an actuator motor (M) is controlled by means of width-modulated d.c. pulses. The circuit comprises a power transistor (T2) which is turned on by a capacitor (C) for a short time interval when a cut-off voltage occurs, thus limiting the cut-off voltage. The transistor (T2) then reverts to the high-resistance state again. This prevents the actuator motor (M) from shorting during the phase in which the motor is reset by spring action to its O-position.