Current transducer with integrated primary conductor bar

• US 9,804,202 B2
• Filed: 05/06/2016
• Issued: 10/31/2017
• Est. Priority Date: 05/09/2015
• Status: Active Grant

• Current Assignee: LEM International SA (LEM Holding SA)
• Original Assignee: Lem Intellectual Property SA (LEM Holding SA)
• Inventors: Labbe, Arnaud
• Primary Examiner(s): Le, Thang
• Application Number:
  US15/148,975
• Publication Number:
  US 20160327593A1
• Time in Patent Office: 543 Days
• Field of Search: 324260, 324249, 324109, 324235, 324117 R, 324117 H, 324244, 324251, 32420712-20713
• CPC Class Codes: G01R 15/183 using transformers with a magnetic core
• CPC Class Codes: G01R 15/185 with compensation or feedback windings or interacting coils, e.g. 0-flux sensors using galvano-magnetic field sensors G01R15/20; conversion of DC into AC using transductors G01R19/20
• CPC Class Codes: G01R 15/207 Constructional details independent of the type of device used
• CPC Class Codes: G01R 19/0092 measuring current only all subgroups of G01R19/00 take precedence
• CPC Class Codes: G01R 31/364 Battery terminal connectors with integrated measuring arrangements

Abstract

An electrical current transducer is disclosed which includes a primary conductor bar for carrying the current to be measured, a magnetic core having a magnetic circuit gap, a magnetic field sensor having a magnetic field detector positioned in the magnetic circuit gap, and an insulating housing surrounding the magnetic core and magnetic field sensor. The primary conductor bar has connection terminal ends extending outside of the housing configured for connection to an external primary conductor. The primary conductor bar has a core passage section comprising a fuse portion configured for interruption of the primary conductor if a predefined electrical current is exceeded. The core passage section has a reduced width (W1) in comparison to the connection terminal ends extending outside of the housing thereby providing indents within which at least a portion of the magnetic core is positioned such that a central passage of the magnetic core has a width (W3) less than the width (W2) of the primary conductor connection ends.

Claims

1. An electrical current transducer comprising a primary conductor bar for carrying the current to be measured, a magnetic core having a magnetic circuit gap, a magnetic field sensor having a magnetic field detector positioned in the magnetic circuit gap, and an insulting housing surrounding the magnetic core and the magnetic field sensor, wherein the primary conductor bar comprising connection terminal ends extending outside of the insulating housing configured for connection terminal ends extending outside of the insulating housing configured for connection to an external primary conductor, the primary conductor bar further comprises a core passage section which includes a fuse portion configured for interruption of the primary conductor if a predefined electrical current is exceeded, the core passage section having a reduced width (W1) in comparison to the connection terminal ends extending outside of the insulating housing thereby providing indents within which at least a portion of the magnetic core is positioned such that a central passage of the magnetic core has a width (W3) less than a width (W2) of the connection terminal ends of the primary conductor bar.

2. The electrical current transducer according to claim 1, wherein the magnetic field detector is positioned within an indent of the core passage section of the primary conductor bar.

3. The electrical current transducer according to claim 1, wherein the magnetic field detector comprises a circuit board and the magnetic field detector is mounted on the circuit board.

4. The electrical current transducer according to claim 1 further comprising a connector configured for pluggable connection to an external connector, the connector comprising terminals directly mounted and connected to a circuit board of the magnetic field sensor.

5. The electrical current transducer according to claim 4, wherein the magnetic field detector is in a form of an ASIC and comprises a Hall effect cell.

6. The electrical current transducer according to claim 1, wherein the current transducer is an open-loop current transducer.

7. The electrical current transducer according to claim 6, wherein at least one of the connection terminal ends of the primary conductor bar is configured as a crimp connection terminal for crimp connection to an end of an electrical cable.

8. The electrical current transducer according to claim 1, wherein at least one of the connection terminal ends of the primary conductor bar is in a form of a connection terminal for a clamping or a bolt connection to the external primary conductor.

9. The electrical current transducer according to claim 1, wherein the current transducer is configured for connection to a cable for connection to an automotive battery.

10. The electrical current transducer according to any of the preceding claims, wherein the magnetic core is a gapped tape wound core.

11. The electrical current transducer according to claim 1, wherein the magnetic core is a single piece integrally formed ferrite part.

12. The electrical current transducer according to claim 1, further comprising an insulating safety cover mounted between the fuse portion and the magnetic core.