Controller for synthesizer circuit for generating three-tier wav

Details Controller for synthesizer circuit for generating three-tier wav Controller for synthesizer circuit for generating three-tier wav

1978-03-27

1979-09-11

Shoop, William M.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

363 43, H02M 112

Patent

active

041677757

ABSTRACT:
A method and apparatus for producing control signals for operating an inverter circuit to convert a DC voltage into multitiered steplike notched N phase AC output signals (N=some positive integer number other than zero). A plurality of N reference sine waves are generated 90.degree. out of phase with one another for N=2, and for N greater than 2, successive ones of said N reference sine waves are generated 360.degree./N out of phase with each other. First through third triangular sampling or timing waveforms are generated and concurrently compared with the uppermost, central and lowermost portions, respectively, of each individual one of said N reference sine waves, for producing N sets of first, second and third pulse width modulated pulse trains, respectively. Decoding logic networks are receptive of these N sets of first through third pulse trains, for decoding these pulse trains into the necessary control signals for operating a particular inverter circuit.

REFERENCES:
patent: 3419780 (1968-12-01), Vergez, Jr.
patent: 3510749 (1970-05-01), Resch
patent: 3510751 (1970-05-01), Resch
patent: 3916285 (1975-10-01), Iwata et al.
patent: 3970916 (1976-07-01), Kienscherf
patent: 4047083 (1977-09-01), Plunkett
patent: 4099109 (1978-07-01), Abbondanti
patent: 4117364 (1978-09-01), Baker

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