SCHALTUNGSANORDNUNG ZUR STEUERUNG DES LAENGSSCHALTGLIEDES EINES GETAKTETEN STROMVERSORGUNGSGERAETS.

摘要

The control circuit has a pulse generator (1) providing a pulse signal (Ve) with a pulse/pause ratio dependant on a setting signal (Vc) supplied via an optocoupler (13). The pulse generator (1) uses an operational amplifier (10) with a feedback loop employing a capacitor (15) and a variable resistance provided by the phototransistor (132) of the optocoupler (13) in parallel with an ohmic resistance (12). The output of the operational amplifier (10) is coupled via a diode (D) to the emitter of an amplifier transistor (18) The feedback loop is coupled to the emitter of the transistor (18) with a second feedback loop (11) coupled to the output of the operational amplifier (10).