Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1983-07-14
1985-05-28
Wong, Peter S.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 56, 363 98, H02M 112, H02P 1318
Patent
active
045204373
ABSTRACT:
A waveform synthesizer is controlled in response to a stored program control utilizing tabular data stored in memory as the basis for generating timing signals to drive the power switching devices of the synthesizer. A plurality of tables of differing modulation indices define rated current output and a below rated current output. The table defines rated level output timing signals as both pulse width and frequency modulated to reduce harmonics. Various overload conditions result in selection of different modulation indices or a total current shutdown. A high peak current overload results in a halt in a progressive upward selection of modulation indices during start-up. A high average current overload results in a reduction in modulation indices until the overload has cleared. A low converter voltage signal caused by current limiting in the converter is detected and also used to reduce the modulation index so that less DC current is drawn from the converter and operation is maintained near the maximum average output power capability of the converter.
REFERENCES:
patent: 3373334 (1968-03-01), Geisz et al.
patent: 3376490 (1968-04-01), Osugi
patent: 3614590 (1971-10-01), Kernick
patent: 3769568 (1973-10-01), Hamilton et al.
patent: 4410935 (1983-10-01), Dang
"A Digital Signal Generator", IEEE Micro, vol. 1, Issue 4, Nov. 1981, T. S. Kinsel and J. H. Wuorinen, pp. 6-15.
Boettcher, Jr. Charles W.
Hamilton Billy H.
Slak William M.
Zweig Walter L.
AT&T Bell Laboratories
Steinmetz Alfred G.
Wong Peter S.
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