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. 05, 2014
Filed:
May. 10, 2010
Wolfram Teppan, Collonges-Sous-Salève, FR;
Davide Azzoni, Meyrin, CH;
Wolfram Teppan, Collonges-Sous-Salève, FR;
Davide Azzoni, Meyrin, CH;
LEM Intellectual Property SA, Fribourg, CH;
Abstract
Electrical current sensor comprising a measuring circuit () and an inductor () for measuring a primary current Iflowing in a primary conductor (), the inductor comprising a saturable magnetic core () made of a highly permeable magnetic material and a secondary coil () for carrying an alternating excitation i configured to alternatingly saturate the magnetic core, the coil being connected to the measuring circuit. The measuring circuit is configured to supply a positive or negative voltage to the inductor, to switch off the voltage when a condition signalling saturation is reached, to measure the time to saturation tin one direction and the time to saturation tin the other direction of the magnetic core and determine therefrom a value of the primary current for small current amplitudes, the measuring circuit being further configured for evaluating the average value of the excitation current i and determining therefrom the value of the primary current for large currents.