Starting of inverter with forced commutation - blocks change of ignition control signal during commutation processes and has memories for each branch of rectifiers

摘要

The invertor has a power part with controlled main rectifiers and commutation devices allocated to them and a control unit for generation of ignition control signals corresp. to the required conduction periods. Ignition pulses are derived from these signals. During stand-by operation, retransmission of ignition control signals of the control unit, synchronised with the mains voltage, causes signals to the invertor controlled rectifier to be blocked. They are immediately released on reception of a start command. For each branch of the rectifiers (5) a storage unit (16, 17) is provided which has anti-valent outputs. These are connected with AND trigger gates (18-21) on the input side and with pulse formers (22-25) on the output side.