Electric power conversion systems – Current conversion – With condition responsive means to control the output...
Patent
1983-02-02
1984-12-25
Wong, Peter S.
Electric power conversion systems
Current conversion
With condition responsive means to control the output...
363129, H02M 7155
Patent
active
044907800
ABSTRACT:
A microprocessor-based static converter control circuit includes a free-running counter which is synchronized with the powerline phase and frequency using a zero-crossing detector circuit. Firing angle commands are received and converted to a corresponding firing count. The microprocessor outputs a firing code for the thyristor firing pulse circuit when the count of the free running counter reaches the firing count.
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S. C. Gupta, et al., "A Generalized Firing Angle Controller Using Phase-Locked Loop for Thyristor Control", Feb., 1981, IEEE Transactions on Industrial Electronics and Control Instrumentation, vol. IECI-28, No. 1.
G. Olivier, et al., "Microprocessor Controller for a Thyristor Converter with an Improved Power Factor", Concordia University, Montreal, Canada.
S. Ashoka Krishna Bhat, "Novel Equidistant Digital Pulse Firing Schemes for Three-Phase Thyristor Converters", Int. J. Electronics, 1981, vol. 50, No. 3, 175-182.
Guy Olivier, et al., "Digitally Controlled Thyristor Current Source", Aug., 1979 IEE Transactions on Industrial Electronics and Control Instrumentation, vol., IECI-26, No. 3.
G. Olivier, et al., "Thyristor Current Source with an Improved Power Factor, Concordia University, Montreal, Quebec, Canada.
Dr. S. K. Tso, et al., "Dedicated-Microprocessor Scheme for Thyristor Phase Control of Multiphase Converters".
Allen-Bradley Company
Sammons Barry E.
Wong Peter S.
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