Digital gate pulse generator for cycloconverter control

Electric power conversion systems – Frequency conversion without intermediate conversion to d.c. – By semiconductor converter

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363159, H02M 5257

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active

048191485

ABSTRACT:
The present invention provides a digital gate pulse generator which controls the output of a cycloconverter used for electrical power conversion applications by determining the timing and delivery of the firing pulses to the switching devices in the cycloconverter. Previous gate pulse generators have been built with largely analog or discrete digital circuitry which require many precision components and periodic adjustment. The gate pulse generator of the present invention utilizes digital techniques and a predetermined series of values to develop the necessary timing signals for firing the switching device. Each timing signal is compared with a reference signal to determine the exact firing time. The present invention is significantly more compact than previous gate pulse generators, responds quickly to changes in the output demand and requires only one precision component and no adjustments.

REFERENCES:
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Park et al., "Microprocessor-Controlled Cycloconverter," Proceedings of the 1979 International Symposium on Circuits and Systems, Tokyo, Japan (Jul. 1979) at pp. 924-1943.
Tso et al., "Efficient Microprocessor-based Cyclocon verter Control," IEEE Proceedings, vol. 127, Pt. B, No. 3 (May 1980) at pp. 190-196.
Singh et al., "Microprocessor-Controlled Single-Phase Cycloconverter," IEEE Transactions on Industrial Electronics and Control Instrumentation, vol. IECE-25, No. 3 (Aug. 1978) at pp. 233-238.

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