Unrestricted frequency changer system and adjustable frequency A

Details Unrestricted frequency changer system and adjustable frequency A Unrestricted frequency changer system and adjustable frequency A

1983-04-29

1984-12-11

Wong, Peter S.

Electric power conversion systems

Frequency conversion without intermediate conversion to d.c.

By semiconductor converter

318800, 318810, H02M 5257

Patent

active

044882165

ABSTRACT:
In a static frequency changer controlled by adjusting the time of conduction of the bilateral switching units forming static converters, the time of conduction is split into n time intervals of conduction of respective subdurations adding-up to be equivalent to the effective time of conduction of the controlled switching unit, and such subdurations are spread and distributed throughout the time period of control of the switching unit within the original switching pattern of the converters, thereby to improve the quality of the output and input currents.

REFERENCES:
patent: 3470447 (1969-09-01), Gyugyi et al.
patent: 3493838 (1970-02-01), Gyugyi et al.
patent: 3886430 (1975-05-01), Meier
patent: 3902112 (1975-08-01), Cordier
patent: 3970914 (1976-07-01), Salzmann et al.
patent: 4008428 (1977-02-01), Waldmann et al.
patent: 4017744 (1977-04-01), Johnson
patent: 4074348 (1978-02-01), Salzmann et al.
patent: 4338558 (1982-07-01), Okamatsu et al.

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