Digital control device for d.c. thyristor-pulse converter

Details Digital control device for d.c. thyristor-pulse converter Digital control device for d.c. thyristor-pulse converter

1978-04-10

1980-05-20

Miller, J. D.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 96, 363135, H02P 1324

Patent

active

042042674

ABSTRACT:
The proposed digital control device controls a d.c. thyristor-pulse converter and comprises a decoder connected to a clock pulse counter and a reversible counter. The device further includes a control unit, a matching unit containing four AND gates and a sign flip-flop, and a switching unit having six AND gates and two flip-flops. A first AND gate of the switching unit is connected to a control electrode of a first thyristor, a second AND gate of the switching unit is connected to a control electrode of a second thyristor, a third AND gate is connected to a control electrode of a third thyristor, a fourth AND gate is connected to control electrode of a fourth thyristor, a fifth AND gate is connected to the control electrodes of the first and third thyristors, and a sixth AND gate is connected to the control electrodes of the second and fourth thyristors. The clock pulse counter and the AND gates are connected to the flip-flops of the switching unit. In the matching unit, the first and second AND gates are connected to a position selection output of the control unit and the third and fourth AND gates are connected to a position return output of the control unit. Outputs of the second and fourth AND gates are connected to an add input of the reversible counter and the subtract input is connected to outputs of the first and third AND gates of the matching unit. The reversible counter is connected to the decoder, which is connected to the sign flip-flop. A second input of the sign flip-flop is connected to the decoder and to a reset output of the control unit. The sign flip-flop is connected to the second and third AND gates of the matching unit and the first, second, third and fourth AND gates of the switching unit. Another output of the sign flip-flop is connected to the first and fourth AND gates of the matching unit and the fifth and sixth AND gates of the switching unit.

REFERENCES:
patent: 3491283 (1970-01-01), Johnston
patent: 3562625 (1971-02-01), Broek et al.
patent: 3582757 (1971-06-01), Achinger et al.
patent: 3764890 (1973-10-01), Caen
patent: 3919622 (1975-11-01), Alnema et al.
patent: 3986099 (1976-10-01), Beck et al.
patent: 4019116 (1977-04-01), Klantschek
patent: 4063146 (1977-12-01), Oliver

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