Ripple-current reduction schemes for AC converters

Details Ripple-current reduction schemes for AC converters Ripple-current reduction schemes for AC converters

2006-03-21

2006-03-21

Sterrett, Jeffrey (Department: 2838)

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

C363S045000, C363S047000

Reexamination Certificate

active

07016205

ABSTRACT:
An AC ripple current reduction circuit for an AC converter having: an AC voltage source at the input; a first capacitor across which the circuit output voltage is provided; a first, main inductor in series with the first capacitor and the input; an auxiliary circuit including a second capacitor and a transformer coupled to the main inductor, the secondary of the transformer being in series with the second capacitor; and a means for enabling the flow of a time varying voltage across the first and second capacitors that has a frequency much less than the ripple frequency of the current in the main inductor.

REFERENCES:
patent: 5038263 (1991-08-01), Marrero et al.
patent: 5663876 (1997-09-01), Newton et al.
patent: 6693805 (2004-02-01), Steigerwald
patent: 4437560 (1996-05-01), None
Michael J. Schutten, et al, “Ripple Current Cancellation Circuit”, Feb. 2003 IEEE, pp. 464-470.
G. Laimer, et al., “Zero-Ripple EMI Input Filter Concepts for Application in a 1-U 500kHz Si/SiC Three-Phase PWM Rectifier”, IEICE/IEEE Intele C '03, Oct. 19-23, 2003, pp. 750-756.

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