The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 23, 2010
Filed:
Feb. 27, 2008
Applicants:
Mohammad Nanda Rahmana Marwali, Lewis Center, OH (US);
Kevin Kim Eschhofen, Lewis Center, OH (US);
Brian Paul Heber, Delaware, OH (US);
Inventors:
Mohammad Nanda Rahmana Marwali, Lewis Center, OH (US);
Kevin Kim Eschhofen, Lewis Center, OH (US);
Brian Paul Heber, Delaware, OH (US);
Assignee:
Liebert Corporation, Columbus, OH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02J 1/00 (2006.01);
U.S. Cl.
CPC ...
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.