Coaxial resistor
AssigneeIsabellenhuette Heusler GmbH & Co. KG
InventorUllrich HETZLER
Life of this patent
Estimating the term…
Abstract
The invention concerns a coaxial resistor (1) having a forward conductor (6) and a return conductor (7) for conducting the current to be measured in opposite directions and having a resistor element made of a resistance material, the resistor element being arranged in the forward conductor (6) or in the return conductor (7) so that the current flows through the resistor element. The invention provides that the cross-section of at least the internal return conductor (7) is rectangular to the direction of current flow, which simplifies the manufacture of the coaxial resistor (1). Errors caused by thermoelectric voltages, TC of the resistor element and inhomogeneous current distribution are eliminated due to the design.
Claims24
1-16. (canceled)
Coaxial resistor for measuring an electric current, comprising
- a) a forward conductor for conducting the current to be measured,
- b) a return conductor located inside the forward conductor for conducting the current to be measured, the forward conductor and the return conductor being arranged coaxially and electrically connected in series and conducting the current in opposite current flow directions, and having
- c) a resistor element made of a resistance material, the resistor element being arranged in the forward conductor or in the return conductor so that the current flows through the resistor element,
- d) wherein the cross-section of at least the internal return conductor in a section plane perpendicular to the current flow direction is angular.
Coaxial resistor according to 37, wherein
- a) a first printed circuit board plane contains balancing resistors, the balancing resistors each being assigned to the individual pairs of voltage taps in order to weight the individual voltage measured values,
- b) the first printed circuit board plane contains a resistor for compensating the temperature dependence of the resistor element,
- c) a second printed circuit board plane contains a resistor made of copper which serves as a temperature sensor for compensating the temperature dependence of the resistor element,
- d) the copper resistor for temperature compensation consists of two resistors which are connected in parallel and form an average value of the two measuring voltages from the double tap, and
- e) a third printed circuit board plane and a fourth printed circuit board plane have copper connection surfaces for heat compensation in the region of the copper resistors.
Dependencies are inferred from the claim text.