COMMON MODE CHOKE COIL

• US 20190326047A1
• Filed: 04/03/2019
• Published: 10/24/2019
• Est. Priority Date: 04/18/2018
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: YAMAGUCHI, Koichi, HATTORI, Masashi
• Granted Patent: US 11,282,630 B2
• Time in Patent Office: Days
• CPC Class Codes: H01F 17/0013 with stacked layers
• CPC Class Codes: H01F 2017/0073 with a special conductive pattern, e.g. flat spiral
• CPC Class Codes: H01F 2017/0093 Common mode choke coil
• CPC Class Codes: H01F 27/02 Casings
• CPC Class Codes: H01F 27/2804 Printed windings
• CPC Class Codes: H01F 27/292 Surface mounted devices

Abstract

A common mode choke coil includes a body, a first spiral conductor, a second spiral conductor, a first extension conductor, and a second extension conductor. The thickness of the first extension conductor is equal to or less than (thickness of the first spiral conductor)/(winding number of the first spiral conductor), and the width of the first extension conductor is equal to or more than (width of the first spiral conductor)×(thickness of the first spiral conductor)/(thickness of the first extension conductor). The thickness of the second extension conductor is equal to or less than (thickness of the second spiral conductor)/(winding number of the second spiral conductor), and the width of the second extension conductor is equal to or more than (width of the second spiral conductor)×(thickness of the second spiral conductor)/(thickness of the second extension conductor).

Claims

1. A common mode choke coil comprising:

a body;

a first spiral conductor and a second spiral conductor that face each other inside the body and that are wound in respective planes;

a first outer electrode, a second outer electrode, a third outer electrode, and a fourth outer electrode that are disposed on the body;

a first extension conductor that faces the first spiral conductor inside the body, that is on an opposite side of the first spiral conductor from the second spiral conductor, and that extends in a plane; and

a second extension conductor that faces the second spiral conductor inside the body, that is on an opposite side of the second spiral conductor from the first spiral conductor, and that extends in a plane,

wherein

an outer circumferential end of the first spiral conductor is electrically connected to the first outer electrode, a first end portion of the first extension conductor is electrically connected to an inner circumferential end of the first spiral conductor, and a second end portion of the first extension conductor is electrically connected to the second outer electrode,

an outer circumferential end of the second spiral conductor is electrically connected to the third outer electrode, a first end portion of the second extension conductor is electrically connected to an inner circumferential end of the second spiral conductor, and a second end portion of the second extension conductor is electrically connected to the fourth outer electrode,

a thickness of the first extension conductor is equal to or less than (a thickness of the first spiral conductor)/(a winding number of the first spiral conductor), and a width of the first extension conductor is equal to or more than (a width of the first spiral conductor)×

(the thickness of the first spiral conductor)/(the thickness of the first extension conductor), and

a thickness of the second extension conductor is equal to or less than (a thickness of the second spiral conductor)/(a winding number of the second spiral conductor), and a width of the second extension conductor is equal to or more than (a width of the second spiral conductor)×

(the thickness of the second spiral conductor)/(the thickness of the second extension conductor).

2. The common mode choke coil according to claim 1, further comprising:

a first terminal conductor that is connected between the first extension conductor and the second outer electrode inside the body and that extends in a plane; and

a second terminal conductor that is connected between the second extension conductor and the fourth outer electrode inside the body and that extends in a plane,

wherein the first terminal conductor and the first spiral conductor are arranged in the same plane, and the second terminal conductor and the second spiral conductor are arranged in the same plane.

3. The common mode choke coil according to claim 2, wherein

a thickness of the first terminal conductor is equal to the thickness of the first spiral conductor, and a thickness of the second terminal conductor is equal to the thickness of the second spiral conductor.

4. The common mode choke coil according to claim 2, wherein

each of the first terminal conductor and the second terminal conductor has a hollow that extends therethrough in a thickness direction.

5. The common mode choke coil according to claim 4, wherein

the hollow of the first terminal conductor is located such that a longitudinal direction thereof extends toward a center of the first spiral conductor, and

the hollow of the second terminal conductor is located such that a longitudinal direction thereof extends toward a center of the second spiral conductor.

6. The common mode choke coil according to claim 1, wherein

the body includes an insulator that covers the first spiral conductor, the second spiral conductor, the first extension conductor, and the second extension conductor, and a first magnetic material and a second magnetic material that interpose the insulator therebetween in a thickness direction,

the insulator has a hollow that extends through a central portion of the first spiral conductor and a central portion of the second spiral conductor in the thickness direction, and

the first extension conductor and the second extension conductor do not overlap the hollow of the insulator in a top view.

7. The common mode choke coil according to claim 1, wherein

the body includes an insulating substrate that contains glass cloth between the first spiral conductor and the second spiral conductor.

8. The common mode choke coil according to claim 3, wherein

each of the first terminal conductor and the second terminal conductor has a hollow that extends therethrough in a thickness direction.

9. The common mode choke coil according to claim 8, wherein

the hollow of the first terminal conductor is located such that a longitudinal direction thereof extends toward a center of the first spiral conductor, and

the hollow of the second terminal conductor is located such that a longitudinal direction thereof extends toward a center of the second spiral conductor.

10. The common mode choke coil according to claim 2, wherein

the body includes an insulator that covers the first spiral conductor, the second spiral conductor, the first extension conductor, and the second extension conductor, and a first magnetic material and a second magnetic material that interpose the insulator therebetween in a thickness direction,

the insulator has a hollow that extends through a central portion of the first spiral conductor and a central portion of the second spiral conductor in the thickness direction, and

the first extension conductor and the second extension conductor do not overlap the hollow of the insulator in a top view.

11. The common mode choke coil according to claim 3, wherein

the body includes an insulator that covers the first spiral conductor, the second spiral conductor, the first extension conductor, and the second extension conductor, and a first magnetic material and a second magnetic material that interpose the insulator therebetween in a thickness direction,

the insulator has a hollow that extends through a central portion of the first spiral conductor and a central portion of the second spiral conductor in the thickness direction, and

the first extension conductor and the second extension conductor do not overlap the hollow of the insulator in a top view.

12. The common mode choke coil according to claim 4, wherein

the body includes an insulator that covers the first spiral conductor, the second spiral conductor, the first extension conductor, and the second extension conductor, and a first magnetic material and a second magnetic material that interpose the insulator therebetween in a thickness direction,

the insulator has a hollow that extends through a central portion of the first spiral conductor and a central portion of the second spiral conductor in the thickness direction, and

the first extension conductor and the second extension conductor do not overlap the hollow of the insulator in a top view.

13. The common mode choke coil according to claim 5, wherein

the body includes an insulator that covers the first spiral conductor, the second spiral conductor, the first extension conductor, and the second extension conductor, and a first magnetic material and a second magnetic material that interpose the insulator therebetween in a thickness direction,

the insulator has a hollow that extends through a central portion of the first spiral conductor and a central portion of the second spiral conductor in the thickness direction, and

the first extension conductor and the second extension conductor do not overlap the hollow of the insulator in a top view.

14. The common mode choke coil according to claim 8, wherein

the body includes an insulator that covers the first spiral conductor, the second spiral conductor, the first extension conductor, and the second extension conductor, and a first magnetic material and a second magnetic material that interpose the insulator therebetween in a thickness direction,

the insulator has a hollow that extends through a central portion of the first spiral conductor and a central portion of the second spiral conductor in the thickness direction, and

the first extension conductor and the second extension conductor do not overlap the hollow of the insulator in a top view.

15. The common mode choke coil according to claim 2, wherein

the body includes an insulating substrate that contains glass cloth between the first spiral conductor and the second spiral conductor.

16. The common mode choke coil according to claim 3, wherein

the body includes an insulating substrate that contains glass cloth between the first spiral conductor and the second spiral conductor.

17. The common mode choke coil according to claim 4, wherein

the body includes an insulating substrate that contains glass cloth between the first spiral conductor and the second spiral conductor.

18. The common mode choke coil according to claim 5, wherein

the body includes an insulating substrate that contains glass cloth between the first spiral conductor and the second spiral conductor.

19. The common mode choke coil according to claim 6, wherein

the body includes an insulating substrate that contains glass cloth between the first spiral conductor and the second spiral conductor.

20. The common mode choke coil according to claim 8, wherein

the body includes an insulating substrate that contains glass cloth between the first spiral conductor and the second spiral conductor.