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:
Mar. 01, 2011
Filed:
Jul. 16, 2008
Applicants:
Martin Fornage, Petaluma, CA (US);
Mudhafar Hassan-ali, Petaluma, CA (US);
Tibor Bolfan, Rohnert Park, CA (US);
Inventors:
Martin Fornage, Petaluma, CA (US);
Mudhafar Hassan-Ali, Petaluma, CA (US);
Tibor Bolfan, Rohnert Park, CA (US);
Assignee:
Enphase Energy, Inc., Petaluma, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R 13/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method and apparatus for anti-islanding of distributed power generation systems having an inverter comprising a phase locked loop (PLL), a phase shift generator for injecting a phase shift into the PLL during at least one sample period, and a phase error signature monitor for monitoring at least one phase error response of the PLL during the at least one sample period.