YU180889A - OPTICALLY CONNECTED INLET WITH FLOATING TRIGGER CHARGE - Google Patents

Abstract

Optično sklopljen vhod po izumu ima prožilni kondenzator, katerega stalno nabija pomožni impulzni generator preko ločilnega impulznega transformatorja in usmerniške diode, zato lahko vezje po izumu deluje tudi brez zunanje pomožne prožilne napetosti. Pri delovanju s pomožno zunanjo napetostjo omogoča prožilni kondenzator dinamično proženje s skokom pomožne napetosti, ker predstavlja prožilni kondenzator skupaj z zaporedno vezanim uporom diferenciator, kateremu prav ta upor definira amplitudo dinamičnega prožilnega toka. Vezje po izumu deluje lahko tudi statično in to z enosmerno ali pa z izmenično pomožno prožilno napetostjo.The optically coupled input according to the invention has a trigger capacitor, which is constantly charged by an auxiliary pulse generator via an isolating pulse transformer and a rectifier diode, so the circuit according to the invention can operate without an external auxiliary trigger voltage. When operating with auxiliary external voltage, the trigger capacitor enables dynamic triggering with a jump of the auxiliary voltage, because the trigger capacitor together with a series-connected resistor represents a differentiator, to which this resistor defines the amplitude of the dynamic trigger current. The circuit according to the invention can also operate statically with either DC or AC auxiliary trigger voltage.