Common mode choke coil

Patent metadata

Field	Value
Publication number	US-9312062-B2
Application number	US-201414469760-A
Country	US
Kind code	B2
Filing date	Aug 27, 2014
Priority date	Mar 16, 2012
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

In a common mode choke coil, electrodes of input/output terminals are located on a bottom surface of a bottom layer. First linear conductors and second linear conductors are located on base material layers. A primary coil includes the first linear conductors and via hole conductors. A secondary coil includes the second linear conductors and via hole conductors. In a plan view as seen from a direction of winding axes of the primary coil and the secondary coil, as for a plurality of first linear conductors and second linear conductors which are adjacent in a plan direction, there are provided a first region in which the second linear conductors are located between the first linear conductors, and a second region in which the first conductors are located between the second linear conductors.

First claim

What is claimed is:

1. A common mode choke coil comprising:
a laminated body including a plurality of base material layers laminated on each other;
a plurality of first linear conductors respectively provided on surfaces of the plurality of base material layers;
a plurality of second linear conductors respectively provided on the surfaces of the plurality of base material layers;
a primary coil including the plurality of first linear conductors that are spirally wound and connected;
a secondary coil including the plurality of second linear conductors that are spirally wound and connected and magnetically coupled to the primary coil;
a first region in which the plurality of second linear conductors adjacent to each other are located between the first linear conductors as seen in a plan view from a direction of winding axes of the primary coil and the secondary coil; and
a second region in which the plurality of first linear conductors adjacent to each other are located between the second linear conductors as seen in the plan view from the direction of winding axes of the primary coil and the secondary coil; wherein
the first linear conductor and the second linear conductor are not superimposed as seen in the plan view from the direction of the winding axes of the primary coil and the secondary coil in the first region and the second region.

2. The common mode choke coil according to claim 1 , wherein:
the primary coil further includes an interlayer conductor that connects the plurality of first linear conductors between the layers; and
the secondary coil further includes an interlayer conductor that connects the plurality of second linear conductors between the layers.

3. The common mode choke coil according to claim 2 , wherein the first linear conductors and the second linear conductors are point-symmetrical or substantially point-symmetrical with respect to central axes of the primary coil and the secondary coil as seen in a plan view from a laminating direction of the plurality of base material layers.

4. The common mode choke coil according to claim 2 , wherein the plurality of base material layers are non-magnetic body layers.

5. The common mode choke coil according to claim 4 , wherein the laminated body includes a first ESD protective element connected to the primary coil and a second ESD protective element connected to the secondary coil, on a surface or in an inner layer of the laminated body.

6. The common mode choke coil according to claim 5 , wherein the first ESD protective element and the second ESD protective element each include a hollow section inside the laminated body, and a pair of discharge electrodes provided in the hollow section.

7. The common mode choke coil according to claim 1 , wherein the primary coil and the secondary coil are configured such that magnetic fields of the primary coil and the secondary coil cancel each other out with regard to a normal mode signal.

8. The common mode choke coil according to claim 1 , wherein at least some of the plurality of base material layers have different thicknesses.

9. The common mode choke coil according to claim 5 , wherein at least one of the first ESD protective element and the second ESD protective element includes shield layers, a discharge auxiliary electrode, discharge electrodes, and a hollow portion.

10. A high-speed interface comprising the common mode choke coil according to claim 1 .

11. A filter for a power supply circuit comprising the common mode choke coil according to claim 1 .

12. A high speed bus line comprising the common mode choke coil according to claim 1 .

Assignees

• Murata Manufacturing Co

Inventors

• Kato Noboru

Classifications

• H01F17/0013 Primary

  with stacked layers · CPC title

• H01F27/2804 Primary

  Printed windings · CPC title

• H01F2017/0093

  Common mode choke coil · CPC title

• H01F2017/004

  with the coil helically wound around an axis without a core · CPC title

• H01F27/343

  Preventing or reducing surge voltages; oscillations · CPC title