Direct A.C. to A.C. converter controlled by a data processor

Details Direct A.C. to A.C. converter controlled by a data processor Direct A.C. to A.C. converter controlled by a data processor

1983-01-07

1985-08-20

Beha, Jr., William H.

Electric power conversion systems

Frequency conversion without intermediate conversion to d.c.

By semiconductor converter

H02M 5293

Patent

active

045368350

ABSTRACT:
A direct AC to AC supply converter in which the control of the bidirectional switches connecting each conductor of a polyphase input supply to each conductor of an output supply is effected by a data processor, the operation of the program of which is synchronized by interrupt with the input supply. The data processor calculates for each output phase 2 values representing pulse widths out of a repeating sequence of 3 (for three phase input and output supplies) and pulse generators produce 3 abutting width modulated pulses in a constant period much shorter than the periods of the supplies. The interrupt operates a software phase locked loop. The pulse generators include an interlock circuit ensuring that the width modulated pulses do not overlap and an overload detector responsive to the turn-on times of the switches. A default logic circuit responsive to hardward or software failure makes the width modulated pulses of equal duration.

REFERENCES:
patent: 3585489 (1971-06-01), Pelly
patent: 4070605 (1978-01-01), Hoeppner
patent: 4337429 (1982-06-01), Stuart
patent: 4468725 (1984-08-01), Venturini
Dewan et al., "A Microprocessor Based Controller for a Three Phase Controlled Rectifier Bridge," Conference IEEE-IAS, pp. 812-817, 1981 Annual Mtg., Philadelphia, Pa., (USA), Oct. 5-9, 1981.
Tso et al., "Dedicated-Microprocessor Scheme for Thyristor Phase Control of Multiphase Convertors," IEE Proceedings, vol. 128, Pt. B, No. 2, pp. 101-108, Mar. 1981.

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