Electric power conversion systems – Cascaded or combined – diverse conversions in which the... – Combined phase and frequency conversion
Patent
1980-03-05
1981-07-28
Beha, Jr., William H.
Electric power conversion systems
Cascaded or combined, diverse conversions in which the...
Combined phase and frequency conversion
363160, H02P 1330, H02M 527
Patent
active
042813719
ABSTRACT:
The quality of the output waveform of a cycloconverter is greatly improved by a feedback loop that compensates for the inherent nonlinearity of the converter forward gain. A feedback signal, preferably proportional to the current through the shunt capacitor of the converter output filter, is multiplied by a compensating signal generated by full wave rectification of the cycloconverter AC reference signal with the resultant signal summed in opposition with the reference signal before it is applied to the converter control circuit. Alternatively a more precise compensating signal can be generated through 90.degree. phase shifting and negative going full wave rectification of the sinusoidal cycloconverter reference signal.
REFERENCES:
patent: 3148324 (1964-09-01), Peaslee et al.
patent: 3704408 (1972-11-01), Schroeder
patent: 3852654 (1974-12-01), Gyugyi et al.
Beha Jr. William H.
Telfer G. H.
Westinghouse Electric Corp.
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