Device for digital control of a multiphase thyristor-pulse switch

摘要

The output of a control generator (2) is connected to the input of a clock-pulse counter (3) whose logic outputs are connected to main thyristors (12 to 15) via a decoder (20) for non-shifted pulse sequences. The summation output and the subtraction output of a control unit (21) are connected to in each case one input (22, 23) of a control-pulse counting unit (24). The logic outputs of the clock-pulse counter (3) and of the control-pulse counting unit (24) are passed to the inputs of decoders (4 to 7) for shifted pulse sequences, the number of which corresponds to the number of phases (8 to 11). The outputs of the decoders (4 to 7) are connected to turn-off thyristors (16 to 19). The ouputs of the clock-pulse counter (3) shift the operation of each phase. The control-pulse counting unit (24) is a reversing-pulse counter. The decoders (4 to 7) have first and second diode matrices of which the first are intended for shifting the pulse sequences of the clock-pulse counter (3) while the second are intended for confirming the correspondence of the switching states of the control-pulse counting unit (24) with those of the clock-pulse counter (3). Such an arrangement allows the number of switching elements in the clock-pulse counter (3) and in the control-pulse counting unit (24) to be reduced, since these units each consist of one binary counter. <IMAGE>