Inductor coil structure

• US 6,198,375 B1
• Filed: 03/18/1999
• Issued: 03/06/2001
• Est. Priority Date: 03/16/1999
• Status: Expired due to Term

• Current Assignee: Vishay Dale Electronics (Vishay Intertechnology Incorporated)
• Original Assignee: Vishay Dale Electronics (Vishay Intertechnology Incorporated)
• Inventors: Shafer, Timothy M.
• Primary Examiner(s): Donovan, Lincoln
• Assistant Examiner(s): Nguyen, Tuyen T.
• Application Number:
  US09/271,748
• Time in Patent Office: 719 Days
• Field of Search: 336/200, 336/232, 336/83, 336/192, 336/223, 336/225, 336/96, 296/021
• US Class Current: 336/225
• CPC Class Codes: B29C 43/003 characterised by the choice of material
• CPC Class Codes: B29C 43/18 incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles B29C43/206 takes precedence
• CPC Class Codes: B29K 2303/06 Metal powders, metal carbides or the like
• CPC Class Codes: H01F 17/04 with magnetic core
• CPC Class Codes: H01F 2027/2861 Coil formed by folding a blank
• CPC Class Codes: H01F 27/2847 Sheets; Strips H01F27/2866 takes precedence
• CPC Class Codes: H01F 27/292 Surface mounted devices
• CPC Class Codes: H01F 41/04 for manufacturing coils coils for transformer or inductances H01F27/28
• CPC Class Codes: Y10T 29/4902 Electromagnet, transformer or inductor
• CPC Class Codes: Y10T 29/49071 by winding or coiling
• CPC Class Codes: Y10T 29/49135 and shaping, e.g., cutting or bending, etc.
• CPC Class Codes: Y10T 29/49146 with encapsulating, e.g., potting, etc.

Abstract

A high current, low profile inductor includes a conductor coil surrounded by magnetic material to form an inductor body. The inductor coil is formed from a flat plate which is cut into a sine-shaped configuration and then is folded in accordion fashion to create a helical coil.

Claims

1. A high current, low profile inductor comprising:

a helical coil extending along a longitudinal coil axis;

said helical coil comprising an elongated plate having first and second opposite ends, a pair of opposite side edges, and a pair of opposite flat surfaces;

said plate having a plurality of first and second cross segments alternating with one another and extending transversely with respect to said coil axis;

said plate also having a plurality of first and second connecting segments, each of which extends from one of said first and second cross segments, respectively;

each of said first and second cross segments being bent along first and second bend axes, respectively, extending transversely to said coil axis, said first and second bends being in opposite directions from one another;

said first and second cross segments and said first and second coil segments being spaced in a radial direction outwardly from said coil axis so as to leave an open coil center extending along said coil axis.

2. A high current, low profile, inductor according to claim 1 and further comprising a powdered iron material completely surrounding said coil to form an inductor body.

3. A high current, low profile, inductor according to claim 2 wherein said powdered iron material has a density caused by exposure to pressure of from 15 to 25 tons per square inch.

4. A high current, low profile, inductor according to claim 1 wherein said opposite flat surfaces of said plate located at said first and second coil segments and at portions of said first and second connecting segments face in an axial direction with respect to said coil axis.

5. A high current, low profile, inductor according to claim 4 wherein said opposite side edges of said plate located at portions of said first and second coil segments and at portions of said first and second connecting segments face in a radial direction away from said coil axis.