Current sensor arrangement

Patent metadata

Field	Value
Publication number	US-2016131682-A1
Application number	US-201414895285-A
Country	US
Kind code	A1
Filing date	Jun 4, 2014
Priority date	Jun 12, 2013
Publication date	May 12, 2016
Grant date	—

Abstract

The invention relates to a current sensor arrangement comprising a measuring inductor, said measuring inductor having the following features: a first planar measuring coil ( 105 ) having first windings ( 106 ) arranged in a first plane; a second planar measuring coil ( 107 ) having second windings ( 108 ) arranged in a second plane; and a winding-free connecting portion ( 109 ) which electrically connects the first planar measuring coil ( 105 ) to the second planar measuring coil ( 107 ).

First claim

1 . A current sensor arrangement comprising a measuring inductor, wherein the measuring inductor comprises:
a first planar measuring coil with first windings which are arranged in a first plane; a second planar measuring coil with second windings which are arranged in a second plane; and a winding-free connecting section which electrically connects the first planar measuring coil to the second planar measuring coil.

2 . The current sensor arrangement according to claim 1 , wherein the winding-free section electrically connects the first planar measuring coil and the second planar measuring coil in series.

3 . The current sensor arrangement according to claim 1 , wherein the first windings are of planar helical or spiral structure in the first plane, and wherein the second windings are of planar helical or spiral structure in the second plane.

4 . The current sensor arrangement according to claim 1 , wherein the first planar measuring coil and the second planar measuring coil are arranged on both sides of a current-conducting lead.

5 . The current sensor arrangement according to claim 1 , comprising a connection terminal having a first measuring connection which is connected to the first planar measuring coil and a second measuring connection which is electrically connected to the second planar measuring coil by means of a second winding-free connecting section.

6 . The current sensor arrangement according to claim 4 , wherein the current-conducting lead is arranged at least in one of above and below the respective winding-free connecting section.

7 . The current sensor arrangement according to claim 1 , wherein the first plane and the second plane are at least one of (i) parallel to each other and (ii) run at a predetermined angle to one another.

8 . The current sensor arrangement according to claim 1 , wherein the measuring inductor is supported by a circuit board, and wherein the first windings, the second windings and the respective winding-free connecting section are formed by striplines.

9 . The current sensor arrangement according to claim 1 , wherein the first planar measuring coil and the second planar measuring coil have different properties.

10 . The current sensor arrangement according to claim 1 , comprising a second measuring inductor and a third measuring inductor, wherein the second measuring inductor comprises a third planar measuring coil with first windings which are arranged in the first plane, a fourth planar measuring coil with second windings which are arranged in the second plane, and a winding-free connecting section which electrically connects the third planar measuring coil to the fourth planar measuring coil, wherein the third measuring inductor comprises a fifth planar measuring coil with first windings which are arranged in the first plane, a sixth planar measuring coil with second windings which are arranged in the second plane, and a winding-free connecting section which electrically connects the fifth planar measuring coil to the sixth planar measuring coil, and wherein each measuring inductor is provided to measure a current in a respective current-conducting lead of a multi-phase conductor system.

11 . The current sensor arrangement according to claim 10 , wherein the first planar measuring coil and the second planar measuring coil are arranged on both sides of a first current-conducting lead of the multi-phase conductor system, wherein the third planar measuring coil and the fourth planar measuring coil are arranged on both sides of a second current-conducting lead of the multi-phase conductor system, and wherein the fifth planar measuring coil and the sixth planar measuring coil are arranged on both sides of a third current-conducting lead of the multi-phase conductor system.

12 . The current sensor arrangement according to claim 10 , wherein the second planar measuring coil and the third planar measuring coil are arranged adjacent each other at different distances to at least one of the first current-conducting lead and to the second current-conducting lead, and wherein the fourth planar measuring coil and the fifth planar measuring coil are arranged adjacent each other at different distances to at least one of the second current-conducting lead and the third current-conducting lead.

13 . The current sensor arrangement according to claim 10 , wherein the second measuring inductor is laterally offset relative to measuring inductor and relative to the third measuring inductor.

14 . The current sensor arrangement according to claim 13 , wherein the third measuring coil is arranged directly adjacent the first current-conducting lead and wherein the fourth measuring coil is arranged directly adjacent the third current-conducting lead.

15 . The current sensor arrangement according to claim 10 , wherein the current-conducting leads of the multi-phase conductor system run through the vertices of a geometrical triangle, and wherein the second measuring inductor and the third measuring inductor are arranged at the vertices of the planar geometrical triangle.

16 . The current sensor arrangement according to claim 10 , wherein the second planar measuring coil includes at least one of a smaller coil diameter and fewer windings than the first planar measuring coil, wherein the fourth planar measuring coil includes at least one of a smaller coil diameter and fewer windings than the third planar measuring coil, and wherein the sixth planar measuring coil includes at least one of a smaller coil diameter and fewer windings than the fifth planar measuring coil.

17 . The current sensor arrangement according to claim 10 , wherein the respective measuring inductor is designed to emit an output signal, which is dependent upon the intensity of the current in the respective current-conducting lead, wherein the current sensor arrangement further comprises a monitoring device designed to monitor the exceedance of a current threshold by an electric current in the respective current-conducting lead based on the output signal of the respective measuring inductor.

18 . The current sensor arrangement according to claim 17 , wherein the monitoring device comprises:
a first monitoring path for receiving the output signal of the measuring inductor with a first threshold detector and a first diode downstream of the first threshold detector; a second monitoring path for receiving the output signal of the second measuring inductor with a second threshold detector and a second diode downstream of the second threshold; a third monitoring path for receiving the output signal of the third measuring inductor with a third threshold detector and a third diode downstream of the third threshold detector; and a control connection with which the cathode of the first diode, the cathode of the second diode, and the cathode of the third diode are electrically connected; wherein the respective threshold detector is configured to generate an output current upon exceeding a threshold by a current represented by the respective output signal.

19 . The current sensor arrangement according to claim 18 , comprising a short-circuit generating device downstream of the control connection and designed to short circuit at least one of the current-conducting leads in response to an output current at the control connection.

20 . the current sensor arrangement according to claim 9 , wherein the different properties of the first planar measuring coil and the second planar measuring coil comprises at least one of different inductances

Assignees

• Phoenix Contact Gmbh & Co

Inventors

• Scholz Peter
• Schaper Elmar

Classifications

• G01R15/181 Primary

  using coils without a magnetic core, e.g. Rogowski coils · CPC title

• G01R19/0092

  Measuring current only · CPC title

• H01F2017/0073

  with a special conductive pattern, e.g. flat spiral · CPC title