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:
Dec. 28, 2010
Filed:
Jul. 02, 2007
William Davison, Cedar Rapids, IA (US);
Kevin John Malo, Iowa City, IA (US);
Steve M. Meehleder, Cedar Rapids, IA (US);
Ryan James Moffitt, Coralville, IA (US);
Paul Andrew Reid, Cedar Rapids, IA (US);
William Davison, Cedar Rapids, IA (US);
Kevin John Malo, Iowa City, IA (US);
Steve M. Meehleder, Cedar Rapids, IA (US);
Ryan James Moffitt, Coralville, IA (US);
Paul Andrew Reid, Cedar Rapids, IA (US);
Other;
Abstract
An automatic temperature compensation method that automatically adjusts trip point thresholds of a motor circuit protector in response to changes in temperature. The relationship between two curves is exploited to match temperature sensor readings from a temperature sensor circuit with burden resistor percentage values derived from a burden resistor circuit. A temperature inflection point is determined from the intersection of (1) the temperature sensor curve plotting the voltage output of the temperature sensor versus temperature and (2) the burden resistance curve plotting burden resistance versus temperature. A temperature value along the temperature sensor curve is transformed into the corresponding burden resistance on the burden resistance curve. The burden resistance is expressed as a percentage variance from a burden resistance at an ambient temperature. An adjusted trip point threshold is calculated from the computed burden resistor percentage, and the adjusted trip point threshold is stored in a memory.