CONTROL CIRCUIT OF SHARE WITH CURRENT IN THE 12-PULSE RECTIFIER

摘要

PURPOSE: A current division control circuit of 12 pulse rectifier is provided to be capable of removing the current difference in other loads and solving the problem that DC voltage is decreased in accordance with the increase of loads. CONSTITUTION: A 3-winding transformer(1) supplies 3-phase power to a 3-phase AC power supply in accordance with a delta wiring and a Y wiring. A first rectifier(2) rectifies the 3-phase AC power transformed by the delta wiring of the 3-winding transformer(1). A second rectifier(3) rectifies the 3-phase AC power transformed by the Y wiring of the 3-winding transformer(1). A load current division controller(4) varies the control angles of respective thyristor(TH1-TH12) through corresponding drivers(5,6) in accordance the detection currents of the first/second rectifiers(2,3) and output feedback DC voltage(Vfeed). The first driver(5) varies the control angle of the first rectifier(2). The second driver(6) varies the control angle of the second rectifier(3).