Electric power conversion systems – Current conversion – With condition responsive means to control the output...
Patent
1982-12-10
1986-04-29
Wong, Peter S.
Electric power conversion systems
Current conversion
With condition responsive means to control the output...
363129, H02P 1326
Patent
active
045861218
ABSTRACT:
Power delivered to a load by a three-phase supply is controlled by six thyristors which are controlled by a control signal generator comprising a programmed microcomputer (2), a zero-crossover detector (3), a clock pulse generator (6) and a counter (7) so that the thyristor conduction angles are determined by a digital signal applied to an input (17) of the microcomputer. In order to obtain a fast response to changes in the supply frequency and to take into account any unbalance between the supply phases, the microcomputer repeatedly measures the actual length of each nominally 60.degree. portion of a complete period of the supply by starting the counter at a predetermined point within each portion, the counter subsequently being stopped by the output of the detector when the next zero-crossover occurs and then being read by the microcomputer. The microcomputer keeps a running record of the six results most recently obtained and generates the control signals at a predetermined time (determined by the signal at its input 17) prior to the instant at which each subsequent zero-crossover is expected to occur on the basis of when a zero-crossover has already occurred and the current content of the record.
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S. K. Tso and P. T. Ho, "Dedicated Microprocessor Scheme for Thyristor Phase Control of Multiphase Converters" IEE Proceedings, vol. 128, Pt. B, No. 2, Mar. 1981 pp. 101-108.
Guy Olivier, V. R. Stefanovic and Mohammed Akhtar Jamil, "Digitally Controlled Thyristor Current Source" IEEE Transactions on Industrial Electronics and Control Instrumentation, vol. IECI-26, No. 3, Aug. 1979 pp. 185-191.
Franzblau Bernard
Jones Judson H.
Mayer Robert T.
U.S. Philips Corporation
Wong Peter S.
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