Electric power conversion systems – Current conversion – With condition responsive means to control the output...
Patent
1983-12-14
1985-06-11
Wong, Peter S.
Electric power conversion systems
Current conversion
With condition responsive means to control the output...
363 98, 363129, 363132, 363136, H02P 1320, H02P 1326
Patent
active
045232679
ABSTRACT:
A control circuit for a power converter which converts between polyphase periodic power and unidirectional power is disclosed. The control circuit includes first means for sensing a parameter of the periodic power and a ramp generator coupled to the first means for generating a ramp signal having a frequency equal to the frequency of the periodic power. A second means senses a parameter representative of a condition at the output of the power converter and a comparator combines the outputs from the ramp generator and the second means to generate a pulse train having a frequency equal to the frequency of the periodic power but shifted in time relative thereto, with the shift being dependent upon the output parameter. A phase-locked loop, of PLL, multiplies the frequency of the pulse train and additionally develops a signal which is coupled to the ramp generator to maintain the amplitude of the output therefrom at a constant level irrespective of changes in frequency of the periodic power. Multi-phase logic is coupled to the PLL and develops switching signals for switches in the converter.
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IEEE Transactions of Industrial Electronics and Control Instrumentation, vol. IECI-26, No. 3, Aug. 1979, pp. 185-191.
Jones Judson H.
Sundstrand Corporation
Wong Peter S.
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