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:
Aug. 02, 2011
Filed:
May. 22, 2008
Timothy Robert Day, Racine, WI (US);
Daniel Patrick Roth, Pewaukee, WI (US);
Timothy Robert Day, Racine, WI (US);
Daniel Patrick Roth, Pewaukee, WI (US);
Cooper Technologies Company, Houston, TX (US);
Abstract
Device protection using temperature compensation. A logic module associated with groups of capacitors adjusts complex impedance planes associated with the capacitor groups to account for ambient temperature variations. In particular, the logic module is configured to adjust a center of a circle of each complex impedance plane based on an average impedance. The average impedance for a selected capacitor group includes impedance measurements for groups other than the selected group, to prevent capacitor failures in that group from skewing the average. The logic module can adjust the circle center in response to changes in average impedance over periods of time. For example, the logic module can filter measured differences in average impedance using a low pass filter, to distinguish slow impedance changes caused by temperature variations and rapid impedance changes caused by capacitor failures. The logic module can adjust the circle center in accordance with the filtered difference value.