Harmonic eliminating PWM converter

Details Harmonic eliminating PWM converter Harmonic eliminating PWM converter

1997-06-12

1998-11-10

Nguyen, Matthew V.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

363 44, H02M 114

Patent

active

058353640

ABSTRACT:
A PWM based converter including a Y-.DELTA., Y--Y transformer (or a .DELTA.--.DELTA., .DELTA.-Y transformer) wherein the Y-.DELTA. portion of the transformer phase shifts input voltage by 30.degree. with respect to the Y--Y portion of the transformer and thereby eliminates many low order supply line harmonics. The rectifier also includes two series connected PWM switching rectifiers, one rectifier receiving input voltages from the Y--Y portion of the transformer and the other rectifier receiving input voltages from the Y-.DELTA. portion of the transformer, and a controller for controlling the first and second rectifiers so as to eliminate low order harmonics on the supply lines that are not eliminated by the transformer. A capacitive bank is required between each rectifier and the transformer.

REFERENCES:
patent: 3514689 (1970-05-01), Giannamore
patent: 3913005 (1975-10-01), Cook
patent: 3976931 (1976-08-01), Sterling

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