Digital firing control for a converter

Details Digital firing control for a converter Digital firing control for a converter

1975-05-22

1977-12-13

Pellinen, A. D.

Electricity: power supply or regulation systems

Remote sensing

318332, 318345R, 323225C, 324127, 328155, 361 76, 363 8T, H02P 728

Patent

active

040631460

ABSTRACT:
A digital firing control for a three-phase full wave silicon controlled rectifier converter. An error signal, in digital form, representing a desired change in firing angle which is a function of the difference between the current being supplied by the converter and a desired current, is utilized to advance or retard the firing angle of the SCR's as required to eliminate the error. Each subsequent firing command is referenced on a time basis from the firing command of the previously fired SCR in the firing sequence rather than being referenced from the zero voltage point of the alternating current supply voltage. The error signal is averaged over the time interval between firing commands so that the control responds to the average difference between the current being supplied and the desired current.

REFERENCES:
patent: 2864037 (1958-12-01), McConnell et al.
patent: 3551748 (1970-12-01), Maynard et al.
patent: 3758720 (1973-09-01), Dinn
patent: 3803476 (1974-04-01), Reeve
patent: 3883791 (1975-05-01), Zelina et al.
patent: 3936726 (1976-02-01), Kelley

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