method for abschnittsteuerung a wechselrichterbetrieb working stromrichterbrücke with löscheinrichtung

摘要

The control system is for a rectifier bridge with feedback and cut-off for a capacitative blind load including braking for traction equipment is used for a fully controlled bridge with four thyristors (1,1',2,2') for the four branches. They form two pairs connected to the secondary winding (4) of the mains transformer. On the d.c. side is a choke (6) in series with the motor (5), which acts as a generator (G) during a braking phase. In parallel with the thyristor pairs are two extinguishing thyristors (3,3') in series with two capacitors (7,8). Instead of a nearly simultaneous firing of the remaining thyristor (1') for forming the second diagonal of the bridge, this is cut off at a variable time constant for forming the second diagonal for the following half wave.