Apparatus for efficient use of a microprocessor to control thyri

Details Apparatus for efficient use of a microprocessor to control thyri Apparatus for efficient use of a microprocessor to control thyri

1982-10-20

1986-03-18

Beha, Jr., William H.

Electric power conversion systems

Current conversion

Using semiconductor-type converter

318345C, 318345E, H02M 1084

Patent

active

045772690

ABSTRACT:
A microprocessor-based solid state AC-DC converter system makes use of the microprocessor facility to implement sequential thyristor firing at selected delay angles. A first timer at the AC line fundamental frequency supplies to the microprocessor a numerical master ramp count, from which individual ramp counts are calculated which relate to the individual thyristors to be fired in sequence. From such an individual ramp count by comparison with a delay angle reference count the microprocessor calculates the number of units of time needed until zero count on the individual ramp. A second timer is preset at an initial count value equal to such calculated number of units of time and the second timer is run to count-down. The thyristor next to be fired is triggered when zero count occurs.

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Bose, Bimal K.; Adjustable Speed A.C. Drives-A Technology Status Review; IEEE, vol. #70, No. 2, Feb. '82, pp. 116-135.

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