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. 24, 2005
Filed:
Sep. 22, 1999
Method for reproducing direct currents and a direct current transformer for carrying out said method
Ulrich Baumgaertl, Berlin, DE;
Henry Franke, Berlin, DE;
Holger Hochgraef, Ganzer/Wusterhausen, DE;
Wolfgang Roehl, Berlin, DE;
Ulrich Baumgaertl, Berlin, DE;
Henry Franke, Berlin, DE;
Holger Hochgraef, Ganzer/Wusterhausen, DE;
Wolfgang Roehl, Berlin, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
The circuit contains a primary coil on the core () of a magnetic circuit with an air gap and switchable into a line carrying the measurement current. A secondary compensation coil (), with an order higher winding count and mounted on the core, is connected to the output of a controllable compensation current source (). The output of a Hall element () in the air gap is connected to the control input of the compensation source. A further coil () on the core is connected to an additional controllable current generator () whose control input () is driven by a measurement device () for the compensation current via a control and evaluation circuit (). USE/ADVANTAGE—Measuring a.c. and d.c. Can be produced at low cost and all drift occurring during measurement can be compensated.