Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Reexamination Certificate
2007-08-06
2010-06-29
Vu, Bao Q (Department: 2838)
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
C363S045000, C363S048000, C363S052000, C363S069000, C363S084000
Reexamination Certificate
active
07746675
ABSTRACT:
In a power converter having m=two or more channels of power factor correction (PFC) circuits connected in parallel and an electromagnetic interference (EMI) filter connected in series therewith, phase shifts in switching between the respective PFC channels can allow increase of EMI filter corner frequency allowing reduction of size and cost of the EMI filter at some switching frequencies. Asymmetrical phase shifts (other than 360°/m) such as 360°/2m and other phase shifts and variations in m allow increase of EMI filter corner frequency at switching frequencies where symmetrical, 360°/m phase shifts provide no benefit to EMI filter design by providing cancellation or partial cancellation of different harmonics of the switching noise; which cancellation may be arranged to be complementary to the EMI filter function at more than one peak of the noise spectrum. (Such asymmetrical phase shifts do not significantly increase ripple and consequent switching noise). Alteration of m and corresponding alteration of phase shift may be performed adaptively for purposes of improving efficiency at light loads and the like.
REFERENCES:
patent: 4384321 (1983-05-01), Rippel
patent: 6043997 (2000-03-01), He et al.
patent: 6069801 (2000-05-01), Hodge et al.
patent: 6154090 (2000-11-01), Wissmach et al.
Elmore, “Input Current Ripple Cancellation in Synchronized, Parallel Connected Critically Continuous Boost Converters,” Proceedings of the IEEE Applied Power Electronics Conference and Exposition (APEC), San Jose, CA, Mar. 3-7, 1996, pp. 152-158.
Ishii et al., “Power Factor Correction using Interleaving Technique for Critical Mode Switching Converters,” Proceedings of the IEEE Power Electronics Specialists Conference (PESC), Japan,1998, pp. 905-910.
Irving et al., “A Comparative Study of Soft-Switched CCM Boost Rectifiers and Interleaved Variable-Frequency DCM Boost Rectifier,” Proceedings of the IEEE Applied Power Electronics Conference (APEC), Feb. 2000, 7 pages.
Zhang et al., “Evaluation of Input Current in the Critical Mode Boost PFC Converter for Distributed Power Systems,” Proceedings of the IEEE Applied Power Electronics Conference(APEC), Feb. 2001, pp. 130-136.
Lee Fred C.
Wang Chuanyun
Xu Ming
Tran Nguyen
Virginia Tech Intellectual Properties Inc.
Vu Bao Q
Whitham Curtis Christofferson & Cook, P.C.
LandOfFree
Asymmetrical interleaving strategy for multi-channel power... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Asymmetrical interleaving strategy for multi-channel power..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Asymmetrical interleaving strategy for multi-channel power... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4247176