Forced-commutated current-source converter and AC motor drive us

Details Forced-commutated current-source converter and AC motor drive us Forced-commutated current-source converter and AC motor drive us

1989-07-28

1991-04-02

Stephan, Steven L.

Electric power conversion systems

Frequency conversion without intermediate conversion to d.c.

By semiconductor converter

363160, H02M 5257

Patent

active

050051156

ABSTRACT:
An AC-to-AC converter operating as a current-source between an AC input line and an AC output line connected to a load, for instance an AC motor, includes three groups of bilateral switches controlled selectively within each group so as to generate a quasi square-wave current in each output phase while establishing a DC voltage between two of the output phases at a time, the third phase being idle, the magnitude of the output voltage being controlled in relation to the firing angle of the switches and the frequency being established by controlling the duration of each square-wave alternance. The duration of such alternances is set to 120 degrees of the output wave, followed and preceded by a 60 degree zero-current period.

REFERENCES:
patent: 3493838 (1970-02-01), Gyugyi et al.
patent: 4002958 (1977-01-01), Akamatsu
patent: 4642751 (1987-02-01), Schauder
patent: 4648022 (1987-03-01), Schauder
patent: 4713745 (1987-12-01), Schauder
patent: 4763240 (1988-08-01), Voss
patent: 4777581 (1988-10-01), Smith
Kenneth P. Phillips/IEEE Trans. Ind. Appln., vol. IA-8, pp. 679-683, Nov./Dec. 1972, "Current Source Converter for AC Motor Drives".

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