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:
Jan. 23, 2001
Filed:
Jul. 30, 1999
Friedrich Lenhard, Hanau, DE;
Vacuumschmelze GmbH, Hanau, DE;
Abstract
Current sensor according to the compensation principle, in which the magnetic field produced by a primary winding (,) through which the current to be measured flows is compensated by the compensation current in a secondary winding (,), and in which for the controlling of the compensation current at least one sensor (,) that is influenced by the magnetic field acquires deviations from the zero current and supplies this measurement value to a driver circuit (,) for the production of the compensation current, whereby at the output of the driver circuit (,) the secondary winding (,) is connected in series to a terminating resistance (,), a voltage (Ua) that is proportional to the current to be measured is present at the terminating resistance (,), two amplifiers (,) in a bridge circuit, which are controlled by the measurement value and which supply output signals in phase opposition to one another, are used as a driver circuit (,), and the series circuit of the secondary winding (,) and terminating resistance (,) is connected between the outputs of the amplifiers.