Mixed current sensor and method for fitting said sensor

• US 9,341,654 B2
• Filed: 05/06/2013
• Issued: 05/17/2016
• Est. Priority Date: 05/21/2012
• Status: Active Grant

• Current Assignee: Schneider Electric Industries SAS (Schneider Electric SE)
• Original Assignee: Schneider Electric Industries SAS (Schneider Electric SE)
• Inventors: Loglisci, David
• Primary Examiner(s): Hollington, Jermele M
• Assistant Examiner(s): MCANDREW, CHRISTOPHER P
• Application Number:
  US13/887,696
• Publication Number:
  US 20130314083A1
• Time in Patent Office: 1,107 Days
• Field of Search: 324/244, 324/227
• US Class Current: 1/1
• CPC Class Codes: G01R 15/181 using coils without a magnetic core, e.g. Rogowski coils
• CPC Class Codes: G01R 15/207 Constructional details independent of the type of device used
• CPC Class Codes: G01R 19/00 Arrangements for measuring currents or voltages or for indicating presence or sign thereof G01R5/00 takes precedence; for measuring bioelectric currents or voltages A61B5/24
• CPC Class Codes: G01R 19/0092 measuring current only all subgroups of G01R19/00 take precedence
• CPC Class Codes: G01R 3/00 Apparatus or processes specially adapted for the manufacture or maintenance of measuring instruments , e.g. of probe tips
• CPC Class Codes: G01R 33/0047 Housings or packaging of magnetic sensors packaging of semiconductor devices H01L23/00; Holders
• CPC Class Codes: G01R 33/02 Measuring direction or magnitude of magnetic fields or magnetic flux G01R33/20 takes precedence
• CPC Class Codes: H01F 38/30 Constructions
• CPC Class Codes: Y10T 29/4913 Assembling to base an electrical component, e.g., capacitor, etc.

Abstract

The invention relates to a mixed current sensor comprising in a case:

• • a magnetic current sensor;
  • a current measuring device comprising a Rogowski coil arranged in such a way that a primary circuit of the magnetic sensor corresponds to the primary circuit of said current measuring device,
  • electronic means for performing acquisition and measurement of the electric current.

Said sensor comprises a linking cassette comprising

• • first fixing means arranged to position and secure said cassette by clip-fastening onto the measuring device;
  • second fixing means arranged to position and secure said cassette and the measuring device by clip-fastening onto the case.

Claims

1. A mixed current sensor secured within a case, the case comprising a base including a first housing and a second housing, the mixed current sensor comprising:

a magnetic current sensor having a coil wound around a magnetic circuit;

a current measuring device comprising a Rogowski coil arranged in such a way that a primary circuit of the magnetic sensor corresponds to the primary circuit of said current measuring device, the magnetic current sensor and the current measuring device being positioned inside walls of the second housing and being covered by a second cover on outer edges of the walls of the second housing;

an electronic-printed circuit that acquires and measures electric current, said electronic printed circuit being supplied with the electric current from the coil of the magnetic current sensor, being positioned inside walls of the first housing and being covered by a first cover on outer edges of the walls of the first housing; and

a linking cassette including

a first fixing arranged to position and secure said linking cassette by clip-fastening the linking cassette onto the current measuring device without soldering;

a second fixing arranged to position and secure said linking cassette and the current measuring device by clip-fastening the linking cassette within the case without soldering; and

electric pins respectively connected to the Rogowski coil and to the electronic printed circuit to acquire and measure the electric current, wherein

electric tracks are securedly attached to the base and electrically soldered onto the coil of the magnetic current sensor, and the electric tracks connect the magnetic current sensor to the electronic printed circuit.

2. The mixed current sensor according to claim 1, wherein the Rogowski coil is composed of an insulating shell on which a metal wire is wound, said shell comprising clip-fastening means designed to collaborate with the first fixing.

3. The mixed current sensor according to claim 2, wherein the clip-fastening and the first fixing together form a system of mortise and tenon type.

4. The mixed current sensor according to claim 1, wherein the second fixing comprises at least one centering and fixing pin to position and secure the linking cassette and the current measuring device by clip-fastening to the case.

5. The mixed current sensor according to claim 1, wherein one of the walls of said first housing comprising an opening for passage of the linking cassette.

6. The mixed current sensor according to claim 5, wherein the electronic printed circuit comprises a printed circuit board that is positioned inside the walls of the housing, and the printed circuit board comprises holes through which the electric pins of the linking cassette is engaged and pass through.

7. The mixed current sensor according to claim 5, wherein the magnetic current sensor is connected to the electronic printed circuit for performing acquisition and management of the electric current by rigid electric tracks securedly attached to the base.

8. A method for fitting a mixed current sensor into a case, the mixed current sensor comprising a magnetic current sensor having a coil wound around a magnetic circuit, a current measuring device having a Rogowski coil, an electronic printed circuit that acquires and measures electric current, and a linking cassette including a first fixing, a second fixing and electric pins, the case comprising a base including a first housing for the electronic printed circuit and a second housing for the magnetic current sensor and the current measuring device, said method comprising:

fixing the linking cassette on an insulating shell of the current measuring device without soldering, wherein the Rogowski coil is composed of the insulating shell on which metal wires are wound, said insulating shell comprising a clip-fastener that collaborates with the first fixing of the linking cassette, and the wires of the coil of the current measuring device being electrically connected to the electric pins of the linking cassette;

positioning an assembly formed by the linking cassette and a coiled shell in the first housing of the base of the case, two centering pins of the linking cassette enabling positioning and securing of the linking cassette and of the current measuring device by clip-fastening the assembly onto the case without soldering;

fixing the magnetic current sensor in the base of the case;

electrically soldering electric tracks onto the coil of the magnetic current sensor, the magnetic current sensor being connected to the electronic printed circuit for acquiring and managing the electric current by the electric tracks securedly attached to the base;

positioning an electronic printed circuit board of the electronic printed circuit inside the walls of the first housing;

soldering the electric pins of the linking cassette and the electric pins of the electric tracks onto the electronic printed circuit board of the electronic printed circuit;

positioning and soldering a first cover on outer edges of walls of the first housing; and

positioning and soldering a second cover on outer edges of walls of the second housing of the base.

9. The method for fitting according to claim 8, wherein the electric pins of the linking cassette and the electric pins of the electric tracks are soldered onto the printed circuit board of the electronic printed circuit by laser tin brazing.