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. 16, 2014
Filed:
Dec. 01, 2009
Thomas Badegruber, Lambach, AT;
Helmut Ennsbrunner, Leonding, AT;
Thomas Badegruber, Lambach, AT;
Helmut Ennsbrunner, Leonding, AT;
Fronius International GmbH, Pettenbach, AT;
Abstract
The invention relates to a method and a device for determining a direct current (i(t)) flowing in a conductor () and having an amplitude greater than 500 A, which direct current (i(t)) is composed of a number of time-dependent partial currents (i(t)) flowing in individual conductors () with switching elements. To create a drift-free measured value, it is provided that at least one Rogowski coil () is arranged around at least one of the individual conductors () for the induction of a partial voltage (u(t)) through the at least one partial current (i(t)), wherein the individual conductor () is formed by a path of a rectifier () on a secondary side of a transformer () with central tapping, the at least one integrator () is designed for integration of the at least one partial voltage (u(t)), and the at least one integrator () is connected to an evaluation unit () for determining the direct current (i(t)).