Toroidal inductor design for improved Q

• US 7,304,558 B1
• Filed: 01/18/2007
• Issued: 12/04/2007
• Est. Priority Date: 01/18/2007
• Status: Active Grant

• Current Assignee: Harris Corporation (L3Harris Technologies, Inc.)
• Original Assignee: Harris Corporation (L3Harris Technologies, Inc.)
• Inventors: Provo, Terry, Pleskach, Michael D., Payan, Bayardo A.
• Primary Examiner(s): MAI, ANH T
• Application Number:
  US11/624,321
• Time in Patent Office: 320 Days
• Field of Search: 336/200, 336/223, 336/232, 296/021, 296/05, 296/06
• US Class Current: 336/200
• CPC Class Codes: H01F 17/0013 with stacked layers
• CPC Class Codes: H01F 17/0033 with the coil helically wound around a magnetic core
• CPC Class Codes: H01F 17/062 Toroidal core with turns of coil around it
• CPC Class Codes: H01F 2027/2814 with only part of the coil or of the winding in the printed circuit board, e.g. the remaining coil or winding sections can be made of wires or sheets
• CPC Class Codes: Y10T 29/4902 Electromagnet, transformer or inductor
• CPC Class Codes: Y10T 29/49073 by assembling coil and core

Abstract

A toroidal inductor (100) and method of forming same. The invention is intended to decrease the direct current resistance (DCR) of the toroidal inductor circuit. Thus, an increase in the quality factor (Q) of the circuit is produced. The toroidal inductor includes a coil formed from an elongated conductor extending around a core material and defining a plurality of turns. The elongated conductor is comprised of one or more coil segments. The coil segments are arranged in an alternating pattern of a first type segment (101) and a second type segment (102). Each of the coil segments of the first type includes a plurality of elongated parallel conductors (104, 105) spaced apart and electrically connected by conductive links (108) at predetermined intervals along their respective lengths. The coil segments of the second type are formed of a single conductor defined by a conductive via (302, 304) formed in the substrate.

Claims

1. An inductor, comprising:

a coil formed from an elongated conductor extending around a core material and defining a plurality of turns;

said elongated conductor comprised of at least one coil segment of a first type, each said coil segment of said first type comprised of a plurality of elongated parallel conductors spaced apart and electrically connected by conductive links at predetermined intervals along their respective lengths.

2. The inductor according to claim 1, wherein said elongated conductor is further comprised of at least one coil segment of a second type, said coil segment of said second type formed of a single conductor.

3. The inductor according to claim 2, wherein said coil segment of said first type and said coil segment of said second type are arranged in a series configuration to form said elongated conductor.

4. The inductor according to claim 3, wherein said elongated conductor is comprised of a plurality of said coil segments of said first type and a plurality of said coil segments of said second type, each said coil segment of said second type defining a series electrical connection between coil segments of said first type.

5. The inductor according to claim 2, wherein each said single conductor comprising said coil segment of said second type is comprised of a conductive via formed in a substrate.

6. The inductor according to claim 1, wherein each of said elongated parallel conductors is comprised of a conductive trace disposed on a surface of a substrate.

7. The inductor according to claim 1 wherein said conductive links are formed from vias defined in a substrate.

8. An inductor, comprising:

a coil formed from an elongated conductor extending around a core material and defining a plurality of turns;

said elongated conductor comprised of a plurality of coil segments arranged in an alternating pattern of a first type segment and a second type segment, said first type segment comprising a plurality of parallel conductors spaced apart and electrically connected at predetermined intervals along a length of said plurality of parallel conductors and said second type segment comprising a single elongated conductor.

9. The inductor according to claim 8, wherein said second type segments are comprised of conductive vias formed in a substrate.

10. The inductor according to claim 8, wherein each said parallel conductor is comprised of a conductive trace disposed on a surface of a substrate, and said conductive traces are connected at said predetermined intervals by at least one conductive via.

11. A method for forming an inductor, comprising:

forming a coil from an elongated conductor extending around a core material to define a plurality of turns;

forming said elongated conductor to include at least one coil segment of a first type comprised of a plurality of elongated parallel conductors spaced apart; and

electrically connecting said elongated parallel conductors by means of conductive links spaced at predetermined intervals along a length of said plurality of elongated parallel conductors.

12. The method according to claim 11, further comprising forming said elongated conductor of at least one coil segment of a second type, said coil segment of said second type formed of a single conductor.

13. The method according to claim 12, further comprising arranging said at least one coil segment of said first type and said at least one coil segment of said second type in a series configuration to form said elongated conductor.

14. The method according to claim 13, further comprising forming with said at least one coil segment of said second type a series electrical connection between a plurality of said coil segments of said first type.

15. The method according to claim 12, further comprising forming each said coil segment of said second type as a conductive via formed in a substrate.

16. The method according to claim 11, further comprising forming each of said parallel conductors as a conductive trace disposed on a surface of a substrate.

17. The method according to claim 11 further comprising forming said conductive links from vias defined in a substrate.

18. A method for forming an inductor, comprising:

forming an elongated conductor which extends a plurality of turns around a core material to define a coil;

selecting said elongated conductor to include a plurality of coil segments arranged in an alternating pattern of a first type segment and a second type segment;

selecting said first type segment to include a plurality of parallel conductors spaced apart and electrically connected to each other at predetermined intervals along a length of said plurality of parallel conductors and said second type segment to include a single conductor.

19. The method according to claim 18, further comprising forming said second type segments as conductive vias disposed within a substrate.

20. The method according to claim 19, further comprising forming each said parallel conductor as a conductive trace disposed on a surface of a substrate, and connecting said conductive traces at said predetermined intervals by at least one conductive via.