Circuit arrangement for generating a pulse-width modulated signa

Details Circuit arrangement for generating a pulse-width modulated signa Circuit arrangement for generating a pulse-width modulated signa

1977-04-13

1980-02-19

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318341, H02P 742

Patent

active

041896696

ABSTRACT:
A digital device for controlling a three-phase motor comprises a circuit arrangement for generating three pulse-width modulated carrier waves which are 120.degree. phase-shifted relative to each other, whose modulation depth as a function of time represents a sinewave. A first clock signal periodically starts an up/down counter which counts the second clock signal. The carrier wave is generated by switching a flip-flop each time that the maximum count of the up/down counter is reached and the various modulation pulses which are required are generated symmetrically relative to this maximum count. A sequential network modulates the carrier wave sequentially with the correct modulation pulses.

REFERENCES:
patent: 3064173 (1962-11-01), Breen et al.
patent: 3206665 (1965-09-01), Burlingham
patent: 3646417 (1972-02-01), Cassie et al.
patent: 3946293 (1976-03-01), Feld
patent: 3950682 (1976-04-01), Dohanich, Jr.
patent: 4117364 (1978-09-01), Baker

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