Electrical transmission or interconnection systems – Plural supply circuits or sources – Connecting or disconnecting
Reexamination Certificate
2008-02-27
2010-02-23
Deberadinis, Robert L. (Department: 2836)
Electrical transmission or interconnection systems
Plural supply circuits or sources
Connecting or disconnecting
Reexamination Certificate
active
07667351
ABSTRACT:
A method for pulse width modulated pulse synchronization in a parallel UPS system uses the locally measured critical bus voltage to detect a zero crossing and adjust the PWM pulse to coincide with the zero crossing. No communication between the units is required to perform synchronization, and no “master” and “slave” relationship exists to thereby increase the total system reliability.
REFERENCES:
patent: 6466465 (2002-10-01), Marwali
patent: 6563048 (2003-05-01), Holt
patent: 6700351 (2004-03-01), Blair
patent: 6768223 (2004-07-01), Powell
patent: 6917124 (2005-07-01), Shetler
patent: 7132951 (2006-11-01), Ziejewski
patent: 7405494 (2008-07-01), Tassitino et al.
patent: 2004/0160214 (2004-08-01), Blair
patent: 2006/0006741 (2006-01-01), Tassitino, Jr. et al.
patent: 2006/0175904 (2006-08-01), Powell
patent: 2006/0193158 (2006-08-01), Fukaya et al.
patent: 2006/0290205 (2006-12-01), Heber
patent: 2007/0007825 (2007-01-01), Heber
Liu, Y., Huang, L., and Hirachi, K. “A Novel Distributed Control Scheme for the Parallel Operation of Digital Controlled UPS.” IECON-2003, Proceedings of the 29th Annual Conference of the IEEE Industrial Electronics Society, Nov. 2, 2003, vol. 1, pp. 668-672, United States of America.
Roberto Braccini, International Search Report for International Patent Application No. PCT/US2008/056375, European Patent Office, Netherlands, Mar. 3, 2008.
Roberto Braccini, Written Opinion for International Patent Application No. PCT/US2008/056375, European Patent Office, Netherlands, Mar. 3, 2008.
Eschhofen Kevin Kim
Heber Brian Paul
Marwali Mohammad Nanda Rahmana
Deberadinis Robert L.
Liebert Corporation
Locke Lord Bissell & Liddell LLP
LandOfFree
Method for pulse width modulation synchronization in a... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for pulse width modulation synchronization in a..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for pulse width modulation synchronization in a... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4228645