Method and apparatus for controlling firing phases of thyristors

Details Method and apparatus for controlling firing phases of thyristors Method and apparatus for controlling firing phases of thyristors

1980-07-22

1982-06-29

Pellinen, A. D.

Electric power conversion systems

Current conversion

Using semiconductor-type converter

318345E, 323241, H02P 516

Patent

active

043375090

ABSTRACT:
A digital control system for controlling firing pulses supplied to thyristors for power conversion to desired phases, wherein data necessary for obtaining desired phase control signals is set in a counter which normally counts clock pulses having a predetermined period and the firing pulses are generated in synchronism with the generation of overflow pulses from the counter. The data setting to the counter, which is repeated at a period shorter than that of the source voltage, is performed by reading out the actual count value of the counter by a digital arithmetic processor circuit, by correcting the read value by the use of the value corresponding to a desired phase and by setting the corrected value again in the counter.

REFERENCES:
patent: 3562625 (1971-02-01), Broek
patent: 3601674 (1971-08-01), Joslyn et al.
patent: 3648148 (1972-03-01), Bechet et al.
patent: 4090116 (1978-05-01), Lippitt

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