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:
May. 02, 2017
Filed:
Dec. 11, 2014
Deere & Company, Moline, IL (US);
Jens Onno Krah, Wuppertal, DE;
Ronnie D. Stahlhut, Bettendorf, IA (US);
DEERE & COMPANY, Moline, IL (US);
Abstract
A current sensor includes an induction coil, a Hall sensor, and a calibration coil loaded by a generator continuously with a calibration current of defined frequency ω. A first evaluation circuit is loaded with the induction signal. A second evaluation circuit, whose input receives the Hall signal, includes a low-pass filter. A third evaluation circuit evaluates a part of the Hall signal that is attributed to the calibration current and uses it for defining a parameter of the second evaluation circuit. A fourth evaluation circuit generates an output signal that represents the current magnitude and is the sum of the output signal of the first evaluation circuit and the output signal of the second evaluation circuit minus the part of the output signal of the second evaluation circuit which is attributed to the calibration current.