US-12626853-B2 - Winding-type coil component

US12626853B2US 12626853 B2US12626853 B2US 12626853B2US-12626853-B2

Abstract

A winding-type coil component includes a first wire and a second wire having a twisted wire portion where the first wire and the second wire are twisted together. Switching positions of the first wire and the second wire in the twisted wire portion are shifted in a circumferential direction of a winding core portion every turn.

Inventors

Kohei Kobayashi
Ryota HASHIMOTO
Hiroyuki TEI
Chihiro YAMAGUCHI

Assignees

MURATA MANUFACTURING CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20240415
Priority Date: 20161208

Claims (14)

1 . A winding-type coil component, comprising: a core including a winding core portion and a first flange portion and a second flange portion, the first flange portion and the second flange portion being provided on a first end of the winding core portion and a second end of the winding core portion, respectively, the first end and the second end being opposite to each other; and a first single wire and a second single wire wound around the winding core portion with substantially the same number of turns, not electrically connected to each other, and having a twisted wire portion where the first single wire and the second single wire are twisted together, a first terminal electrode and a third terminal electrode that are provided on a bottom side of the first flange portion; and a second terminal electrode and a fourth terminal electrode that are provided on a bottom side of the second flange portion; wherein, when viewed from the bottom side of the first and the second flange portions, for at least two adjacent turns of the twisted wire portion of the first and second single wires, switching positions of the first wire and the second wire in the twisted wire portion are shifted in a circumferential direction of the winding core portion between adjacent switching positions at least 3 turns.
2 . The winding-type coil component according to claim 1 , wherein a surface of the winding core portion when viewed from the bottom side of the first and the second flange portions is a planar surface that is parallel to a bottom surface of the first and second flange portions.
3 . The winding-type coil component according to claim 2 , wherein a sectional shape of the winding core portion that is perpendicular to a central axis thereof is a substantially rectangular shape.
4 . The winding-type coil component according to claim 1 , wherein one end portion and the other end portion of the first single wire is connected to the first terminal electrode and the second terminal electrode, respectively, and one end portion and the other end portion of the second single wire is connected to the third terminal electrode and the fourth terminal electrode, respectively.
5 . The winding-type coil component according to claim 1 , wherein the winding-type coil component is a common mode choke coil.
6 . The winding-type coil component according to claim 1 , wherein the number of turns of each of the first and second single wires is about 15 or more.
7 . The winding-type coil component according to claim 1 , wherein at each adjacent part of the twisted wire portion that contacts the winding core portion, either the first single wire or the second single wire contacts the winding core portion.
8 . A winding-type coil component, comprising: a core including a winding core portion and a first flange portion and a second flange portion, the first flange portion and the second flange portion being provided on a first end of the winding core portion and a second end of the winding core portion, respectively, the first end and the second end being opposite to each other; and a first single wire and a second single wire wound around the winding core portion with substantially the same number of turns, not electrically connected to each other, and having a twisted wire portion where the first single wire and the second single wire are twisted together, a first terminal electrode and a third terminal electrode that are provided on a bottom side of the first flange portion; and a second terminal electrode and a fourth terminal electrode that are provided on a bottom side of the second flange portion; wherein when viewed from the bottom side of the first and the second flange portions, switching positions of the first wire and the second wire in the twisted wire portion are shifted in a circumferential direction of the winding core portion between adjacent switching positions at least 3 turns, in each N turns of the twisted wire portion that are adjacent to each other, and N is a natural number.
9 . The winding-type coil component according to claim 8 , wherein a surface of the winding core portion when viewed from the bottom side of the first and the second flange portions is a planar surface that is parallel to a bottom surface of the first and second flange portions.
10 . The winding-type coil component according to claim 9 , wherein a sectional shape of the winding core portion that is perpendicular to a central axis thereof is a substantially rectangular shape.
11 . The winding-type coil component according to claim 8 , wherein one end portion and the other end portion of the first single wire is connected to the first terminal electrode and the second terminal electrode, respectively, and one end portion and the other end portion of the second single wire is connected to the third terminal electrode and the fourth terminal electrode, respectively.
12 . The winding-type coil component according to claim 8 , wherein the winding-type coil component is a common mode choke coil.
13 . The winding-type coil component according to claim 8 , wherein the number of turns of each of the first and second single wires is about 15 or more.
14 . The winding-type coil component according to claim 8 , wherein at each adjacent part of the twisted wire portion that contacts the winding core portion, either the first single wire or the second single wire contacts the winding core portion.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This application is a Divisional of U.S. patent application Ser. No. 17/135,960 filed Dec. 28, 2020, which is a Divisional of U.S. patent application Ser. No. 15/830,364 filed Dec. 4, 2017, which claims benefit of priority to Japanese Patent Application 2016-238564 filed Dec. 8, 2016, the entire content of which is incorporated herein by reference. TECHNICAL FIELD The present disclosure relates to a winding-type coil component, and, more particularly, to a winding-type coil component having a structure in which two wires that are twisted together are wound around a winding core portion. BACKGROUND A winding-type common mode choke coil is a typical example of a winding-type coil component to which the present disclosure is directed. For example, Japanese Unexamined Patent Application Publication No. 2014-207368 describes a common mode choke coil in which a twisted wire including two wires that are twisted together is wound around a winding core portion. In this way, when two wires are formed into a twisted wire, the form of the first wire and the form of the second wire can be made substantially the same. SUMMARY When, as mentioned above, the form of the first wire and the form of the second wire are the same, the difference between the stray capacitance occurring in association the with first wire and the stray capacitance occurring in association with the second wire becomes small, so that, in the common mode choke coil, it may be possible to improve mode conversion characteristics. However, even if the first and second wires are formed into a twisted wire, the stray capacitance occurring in association the first wire and the stray capacitance occurring in association the second wire are not balanced. Therefore, the difference between the stray capacitance occurring in association with one of the wires and the stray capacitance occurring in association with the other of the wires is sometimes large. The inventor of this subject has pursued the causes thereof. In Japanese Unexamined Patent Application Publication No. 2014-207368, the details of the state of the twisted wire including the first and second wires that are twisted together are not discussed. The common mode choke coil described in Japanese Unexamined Patent Application Publication No. 2014-207368 is mounted on a mount board defining a reference electrical potential with the winding core portion oriented parallel to the mount board. In this case, the stray capacitances occur not only between the first and second wires, but also between the first wire and the mount board, and between the second wire and the mount board. Here, when the first and second wires are formed into a twisted wire, regarding the stray capacitance occurring between the first and second wires is balanced to a certain extent. In contrast, even if the first and second wires are formed into a twisted wire, it is difficult to balance the stray capacitance occurring between the mount board and the first wire and the stray capacitance occurring between the mount board and the second wire in each turn, as a result of which the difference between these stray capacitances is large. This is considered below. When the first and second wires are twisted together, the twisted wire includes some turns which has the same disposition of the first wire and the second wire. In particular, when the first and second wires are wound around the winding core portion while twisting the first and second wires automatically by the equipment in the mass production, since the twisting operation and the winding operation are in synchronism, all of the turns in the twisted wire have the same disposition of the first wire and second wire. The stray capacitances is determined by the distances between the wires and the mount board and opposing areas of the wires and the mount board. In this case, therefore either one of the stray capacitance occurring between the first wire and the mount board (at the first wire side) and the stray capacitance occurring between the second wire and the mount board (at the second wire side) is larger in each turn of the twisted wire. Then the difference between the stray capacitance at the first wire side and the stray capacitance at the second wire side accumulates in all turns and becomes larger. The difference between the stray capacitance at the first wire side and the stray capacitance at the second wire side makes mode conversion characteristics deteriorate. Similar problems, in particular, problems regarding differences between capacitances not only occur in common mode choke coils but also in winding type coil components, such as balun or transformers, including two wires that are wound around a winding coil portion with the two wires in a twisted state. Accordingly, it is an object of the present disclosure to provide a winding-type coil component having a structure that allows the difference between the stray capacitance occur