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:
Nov. 25, 2014
Filed:
Jun. 01, 2012
Applicants:
Andrew Barnes, Santa Rosa, CA (US);
Brian Acker, Sebastopol, CA (US);
Inventors:
Andrew Barnes, Santa Rosa, CA (US);
Brian Acker, Sebastopol, CA (US);
Assignee:
Enphase Energy, Inc., Petaluma, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01R 27/08 (2006.01); H02J 3/38 (2006.01);
U.S. Cl.
CPC ...
H02J 3/383 (2013.01); H02J 2003/388 (2013.01); Y02E 10/563 (2013.01);
Abstract
A method and apparatus for monitoring an AC line for impedance change. In one embodiment, the method, comprises superimposing a tone on an AC current coupled to the AC line, wherein the tone is a higher frequency than an AC voltage waveform on the AC line; applying a correlation over a sampled AC voltage waveform, obtained by sampling the AC voltage waveform, to generate a correlated signal; and determining whether at least one change in characteristic of the correlated signal occurs.