Integrated current sensor

• US 7,265,531 B2
• Filed: 04/26/2004
• Issued: 09/04/2007
• Est. Priority Date: 09/20/2002
• Status: Expired due to Term

• Current Assignee: Allegro Microsystems Incorporated (Sanken Electric Company Limited)
• Original Assignee: Allegro Microsystems Incorporated (Sanken Electric Company Limited)
• Inventors: Dickinson, Richard, Sauber, John, Stauth, Jason, Pinelle, Sandra, Engel, Ray
• Primary Examiner(s): KARLSEN, ERNEST F
• Application Number:
  US10/831,906
• Publication Number:
  US 20040196024A1
• Time in Patent Office: 1,226 Days
• Field of Search: None
• US Class Current: 324/117.00H
• CPC Class Codes: G01R 15/202 using Hall-effect devices Hall elements in arrangements for measuring electrical power G01R21/08

Abstract

An integrated current sensor includes a magnetic field transducer such as a Hall effect sensor, a magnetic core, and an electrical conductor. The conductor includes features for receiving portions of the Hall effect sensor and the core and the elements are dimensioned such that little or no relative movement among the elements is possible.

Claims

1. A current sensor comprising:

a conductor having a narrowed region, a tab, and an intermediate region extending from the narrowed region to the tab, wherein the narrowed region has opposing, substantially planar surfaces, wherein the intermediate region has opposing, substantially planar surfaces, wherein the opposing, substantially planar surfaces of the intermediate region are generally parallel to the opposing, substantially planar surfaces of the narrowed region, wherein the narrowed region comprises a notch in a first side of the narrowed region, wherein the tab is adapted to couple to a circuit board with the opposing, substantially planar surfaces of the narrowed region substantially parallel to the circuit board;

a magnetic field transducer; and

a magnetic core having a central region and a pair of substantially parallel legs extending from said central region, wherein a selected one of said magnetic field transducer or said central region of the magnetic core is disposed in the notch and wherein the other one of the magnetic field transducer or the central region of the magnetic core is adjacent to a second, opposite, side of the narrowed region so that said pair of legs straddles the opposing, substantially planar surfaces of the narrowed region with each leg covering at least a portion of a respective surface of the magnetic field transducer.

2. The current sensor of claim 1, further comprising a molded body encapsulating at least a portion of said magnetic field transducer, said conductor, and said magnetic core.

3. The current sensor of claim 1, wherein the magnetic field sensor comprises at least one Hall effect element.

4. The current sensor of claim 1, wherein the magnetic field sensor comprises at least one magnetoresistance element.

5. The current sensor of claim 1, wherein the tab is adapted to be inserted though a hole in the circuit board.

6. The current sensor of claim 1, wherein the tab comprises a plastically bent portion of the conductor.