WO2023210270A1

WO2023210270A1 - Coil component and filter circuit

Info

Publication number: WO2023210270A1
Application number: PCT/JP2023/013833
Authority: WO
Inventors: 淳東條
Original assignee: 株式会社村田製作所
Priority date: 2022-04-27
Filing date: 2023-04-03
Publication date: 2023-11-02

Abstract

A coil component (1) according to the present disclosure is equipped with: a bobbin (2) which has a body section (2a) around which a wire is to be wound, and a first collar section (2c) and second collar section (2b) which are provided at both ends of the body section (2a); a first wire (4) and a second wire (5) which are wound around the body section (2a); and first (6a) through fourth (6d) terminals which are positioned on the first collar section (2c) and the second collar section (2b). The coil component (1) is configured in a manner such that the first wire (4) and the second wire (5) are twisted with one another in a section between the terminals (6b), (6d) and where the first wire (4) or the second wire (5) contacts the body section (2a).

Description

Coil parts and filter circuits

The present disclosure relates to a coil component and a filter circuit that mounts the coil component.

Electronic devices use filter circuits that remove unnecessary noise components from the current flowing through conductors. Filter circuits used for noise countermeasures include, for example, EMI (Electro-Magnetic Interference) removal filters, which use capacitors as capacitance elements. Therefore, it is known that the noise suppression effect of the filter circuit decreases due to the equivalent series inductance (ESL), which is the parasitic inductance of the capacitor.

It is known to improve the noise suppression effect of a filter circuit by canceling the equivalent series inductance ESL of a capacitor with a negative inductance generated by magnetically coupling two coils (for example, Patent Document 1).

When creating a coil component with such a noise suppression effect using a coil component in which two wires are wound around a bobbin, it is necessary to adjust the distance between the wires because the degree of magnetic coupling changes depending on the distance between the two wires. There is. As a method of adjusting the distance between wires, there is a method of sandwiching a distance adjustment wire between two wires (for example, Patent Document 2).

Japanese Patent Application Publication No. 2001-160728 Japanese Patent Application Publication No. 2010-165863

In the coil component of Patent Document 2, the distance between the coil wires is adjusted by winding two coil wires on a tightly wound dummy wire. However, the coil component of Patent Document 2 requires a dummy wire in addition to a normal coil, which increases cost and time, and increases the overall volume.

An object of the present disclosure is to provide a coil component that can be miniaturized as a whole while maintaining a stable coupling state, and a filter circuit that mounts the coil component.

A coil component according to an embodiment of the present disclosure includes a body portion around which a wire is wound, a bobbin having a first flange portion and a second flange portion provided at both ends of the body portion, and a first wire and a bobbin wound around the body portion. 2 wires, a first terminal arranged on the first collar and connected to one end of the first wire, and a second terminal arranged on the second collar and connected to the other end of the first wire. a third terminal arranged on the first collar and connected to one end of the second wire; a fourth terminal arranged on the second collar and connected to the other end of the second wire; Equipped with The part from the first terminal and the third terminal until the first wire or the second wire contacts the body part, or the part from the second terminal and the fourth terminal until the first wire or the second wire contacts the body part The first wire and the second wire are twisted at at least one location.

A filter circuit according to one embodiment of the present disclosure includes the above-described coil component and a capacitor electrically connected to the first wire and the second wire of the coil component.

According to one embodiment of the present disclosure, a portion from the first terminal and the third terminal to the point where the first wire or the second wire comes into contact with the body portion, or from the second terminal and the fourth terminal to the first wire or the second wire. Since the first wire and the second wire are twisted in at least one place before they contact the body, the connection between the first wire and the second wire in the body can be improved without increasing the overall volume. By keeping the distance between them constant, the overall size can be reduced while maintaining a stable bonding state.

FIG. 2 is a side view of a coil component according to an embodiment. FIG. 2 is a perspective view of a coil component according to an embodiment. FIG. 2 is a circuit diagram of a filter circuit according to an embodiment. 7 is a bottom view of a coil component according to modification example 1. FIG. FIG. 7 is a side view of a coil component according to modification example 2. FIG. 7 is a perspective view of a coil component according to a second modification.

<Embodiment>
Below, a coil component according to an embodiment will be described. FIG. 1 is a side view of a coil component 1 according to an embodiment. FIG. 2 is a perspective view of the coil component 1 according to the embodiment. When the X-axis, Y-axis, and Z-axis are defined as shown in Figures 1 and 2, the X-axis direction is the length direction of the coil component 1, the Y-axis direction is the width direction of the coil component 1, and the Z-axis direction is the coil component 1. This is the height direction of component 1.

The coil component 1 is, for example, a transformer coil mounted in a filter circuit used as a countermeasure against noise in a power supply line. As will be described later, the coil component 1 includes two magnetically coupled coils in order to cancel the parasitic inductance of the capacitor mounted in the filter circuit.

The coil component 1 includes a bobbin 2, a first wire 4, and a second wire 5. The bobbin 2 has a body part 2a around which a wire is wound, and a first collar part 2c and a second collar part 2b provided at both ends of the body part 2a. The bobbin 2 is made of a non-conductive material, specifically a non-magnetic material such as alumina, a magnetic material such as Ni--Zn ferrite, or resin. When the bobbin 2 is made of resin, for example, it may be made of a resin containing magnetic powder such as metal powder or ferrite powder, a resin containing non-magnetic powder such as silica powder, or a resin that does not contain filler such as powder. configured.

When the size of the coil component 1 is 2.0 mm x 1.25 mm, the body portion 2a of the bobbin 2 is a prismatic column measuring 1.0 mm x 1.0 mm. Note that in this disclosure, the body portion 2a will be described as a prismatic column, but it may be a cylinder or a polygonal column. In the coil component 1, the first wire 4 and the second wire 5 are wound directly around the body portion 2a. Note that the first wire 4 and the second wire 5 are, for example, copper wires, and are entirely covered with an insulating material.

In order to stabilize the mutual inductance in the coil component 1, it is necessary to keep the opening diameters of the first coil L1 and the second coil L2 and the coil spacing between the first coil L1 and the second coil L2 constant. Therefore, the coil component 1 is formed by simultaneously winding the first wire 4 and the second wire 5 around the body portion 2a in the same direction. Further, the first wire 4 is wound once around the body part 2a to form a first coil L1, and the second wire 5 is wound once around the body part 2a to form a second coil L2.

In the coil component 1, since the number of turns of the first wire 4 and the number of turns of the second wire 5 are one turn, the length of the wire (the length of the wire wound around the body part 2a) and the distance between the wires are determined by the coupling coefficient. greatly affects. In the coil component 1, the first wire 4 and the second wire 5 are wound around the body part 2a so that the length of the wires and the distance between the wires in the body part 2a are kept constant.

Next, the terminal for fixing the first wire 4 and the terminal for fixing the second wire 5 will be explained. As shown in FIG. 2, the first flange 2c and the second flange 2b provided on both sides of the bobbin 2 have a terminal 6a (first terminal) connected to the end of the first wire 4, and a terminal 6b. (second terminal), and terminals 6c (third terminal) and 6d (fourth terminal) connected to the end of the second wire 5. Specifically, the first flange 2c is provided with a terminal 6a and a terminal 6c, and the second flange 2b is provided with a terminal 6b and a terminal 6d, respectively. The plane on which the terminals 6a to 6d are provided in the first flange 2c and the second flange 2b is the XY plane of the bobbin 2 in the coil component 1.

For example, Ag paste is baked onto the terminals 6a to 6d, and Ni plating or Sn plating is applied. Therefore, the ends of the first wire 4 are applied to the

terminals

6a and 6b, and the ends of the second wire 5 are applied to the

terminals

6c and 6d, respectively, and the wires and the terminals are fixed by thermocompression bonding or laser welding. There is. Of course, the method of fixing the wire and the terminal is not limited to this, and a fixing method such as crimping, caulking, or soldering using a metal terminal may be adopted. Further, the wire and the terminal may be fixed by caulking using a metal terminal, and then laser welding may be performed.

The part from the terminal 6a to the body part 2a around which the first wire 4 is wound, and the part from the terminal 6c to the body part 2a around which the second wire 5 is wound, correspond to the part where the first wire 4 and the second wire 5 start to be wound. . The region corresponding to the winding start portion corresponds to the region 7a shown in FIGS. 1 and 2. The part from the terminal 6b to the body part 2a around which the first wire 4 is wound, and the part from the terminal 6d to the body part 2a around which the second wire 5 is wound, correspond to the part where the first wire 4 and the second wire 5 finish winding. . The area corresponding to the winding end portion corresponds to the area 7b shown in FIGS. 1 and 2.

In the region 7a corresponding to the winding start portion, the first wire 4 and the second wire 5 are in a crossing state. In the region 7b corresponding to the end of winding, the first wire 4 and the second wire 5 are in a twisted state. In other words, the first wire 4 and the second wire 5 becomes a twisted state.

Here, the crossed state is a state in which one wire intersects with the other wire at one point and one wire is holding down the other wire, that is, a state in which the terminals are in contact with the body in the opposite arrangement. It is. The twisted state is a state in which one wire and the other wire are twisted together, that is, a state in which the wires are once arranged in the opposite direction from the arrangement of the terminals and then arranged in the same arrangement as the terminals. Furthermore, a state in which the players are in the opposite position again (one and a half rotations) and a state in which they are in the same position again (two revolutions) are also twisted states.

In the area 7a corresponding to the winding start part, the wires can be wound around the body part 2a while applying tension to the first wire 4 and the second wire 5, so one wire can hold down the other wire, so there is no cross-over. It may be in a state where On the other hand, in the region 7b corresponding to the end of winding, it is difficult to apply tension to the wire, so by creating a twisted state, the loosening of the wire can be reduced.

As a result, even if force is applied to the coil component 1 during use, the distance between the first wire 4 and the second wire 5 in the body portion 2a can be kept constant, and the distance between the coils can be prevented from changing. A stable binding state can be maintained. Note that the coil component 1 may have the first wire 4 and the second wire 5 twisted in both the region 7a corresponding to the winding start portion and the region 7b corresponding to the winding end portion. . By twisting at the beginning of winding, the distance between the wires is fixed before winding around the body part 2a begins, and it becomes possible to wind the wires at a constant distance around the body part 2a. When winding the wire around the body part 2a, when winding it closer to either the first flange 2c or the second flange 2b, twisting the wire away from the flange will be more effective in stabilizing the distance between the wires. be.

In the coil component 1, as shown in FIG. 2, the base point of the twisted state of the first wire 4 and the second wire 5 is the position where the terminals 6a to 6d are arranged in the body part 2a of the bobbin 2. It's on the surface. Thereby, the first wire 4 and the second wire 5 can be wound around the body portion 2a for the same length, so that the bonding state can be improved.

As shown in FIG. 2, the coil component 1 has a portion where the first wire 4 and the second wire 5 are twisted on the body portion 2a on a surface other than the surface where the terminals 6a to 6d are provided. I don't. Thereby, the entire coil component 1 can be downsized.

Next, the relationship between the diameters of the first wire 4 and the second wire 5 and the distances between the first flange 2c and the second flange 2b in the height direction (Z direction) will be explained using FIG. The coil component 1 is usually designed so that the first wire 4 and the second wire 5 are accommodated between the body part 2a and the end faces of the first flange part 2c and the second flange part 2b. The height from the body part 2a to the end faces of the first collar part 2c and the second collar part 2b where the terminals 6a to 6d are arranged is R2, and the first collar part from the body part 2a to which the terminals 6a to 6d are not arranged. 2c, and the height to the end surface of the second flange portion 2b is R1. At this time, the relationship R2>R1 holds.

In the part where the first wire 4 and the second wire 5 cross or are twisted (the part of height R2), the first wire 4 and the second wire 5 overlap in the height direction, so the first It is necessary to provide the flange portion 2c and the second flange portion 2b with a height nearly twice the wire diameter. On the other hand, the first wire 4 and the second wire 5 are located in the portion (height R1 portion) from the body portion 2a to the end surfaces of the first flange portion 2c and the second flange portion 2b where the terminals 6a to 6d are not arranged. Since the wires are simply wound around the body portion 2a with a constant distance between them, it is sufficient that R1 is larger than the wire diameter. Thereby, the overall size of the coil component 1 can be reduced by suppressing the height of the first flange portion 2c and the second flange portion 2b on the surface where the terminals 6a to 6d are not arranged. Particularly when it is desired to flow a large current, a thick wire is required, so being able to suppress the height of the surface where the terminals 6a to 6d are not arranged has a particularly large effect on miniaturization.

Let the diameters of the first wire 4 and the second wire 5 be r1. In this case, the height R1 from the body part 2a to the end surfaces of the first collar part 2c and the second collar part 2b where the terminals 6a to 6d are not arranged is 2 of the diameter r1 of the first wire 4 or the second wire 5. The relationship is lower than double (R1<r1×2). Due to this relationship, R1 can be prevented from becoming unnecessarily high in accordance with the diameter r1 of the first wire 4 or the second wire 5, and the entire coil component 1 can be downsized.

Here, the cross-sectional area of the body portion 2a in the YZ plane affects the coil opening. Therefore, in order to obtain a sufficient inductance value, it is preferable that the cross-sectional area of the body portion 2a be made as large as possible. By setting R1 to a height close to the wire diameter on the non-twisted surface, the cross-sectional area of the body portion 2a can be increased without changing the size of the coil component 1.

Next, the filter circuit 100 including the coil component 1 will be explained. FIG. 3 is a circuit diagram of the filter circuit 100 according to the embodiment. The filter circuit 100 is specifically an EMI removal filter circuit, and is a third-order T-type LC filter circuit. Note that in this disclosure, the configuration of the filter circuit 100 will be explained using a third-order T-type LC filter circuit, but the structure may also be applied to a fifth-order T-type LC filter circuit or a higher-order T-type LC filter circuit. A similar configuration can be applied. Filter circuit 100 includes coil component 1 and capacitor C1, as shown in FIG.

The coil component 1 includes a terminal 6a serving as an input terminal, a terminal 6d serving as an output terminal,

terminals

6b and 6c serving as intermediate terminals, a first coil L1, and a second coil L2. Note that the filter circuit 100 can be formed even if the direction of the coil component 1 mounted on the board is reversed. In this case, the input terminal of the coil component 1 is the terminal 6b, and the output terminal is the terminal 6c.

As shown in FIG. 3, the capacitor C1 is connected in series between

terminals

6b and 6c, which are intermediate terminals, and a ground electrode (GND). The number of capacitors C1 may be one, but it is also possible to have a circuit configuration in which two capacitors are arranged in series assuming that the capacitor C1 is installed in a car.

Note that capacitor C1 can be used not only for multilayer ceramic capacitors mainly composed of BaTiO3 (barium titanate), but also for multilayer ceramic capacitors mainly composed of other materials, as well as other non-multilayer ceramic capacitors, such as aluminum electrolytic capacitors. Any type of capacitor may be used.

The capacitor C1 connected to the coil component 1 has an inductor L3 as a parasitic inductance (equivalent series inductance (ESL)). Therefore, the filter circuit 100 has an equivalent circuit configuration in which the inductor L3 is connected in series with the capacitor C1, as shown in FIG.

In addition to the capacitor C1, a first coil L1 and a second coil L2 are connected to the

terminals

6b and 6c. The first coil L1 and the second coil L2 are magnetically coupled and generate a negative inductance component (mutual inductance M). Using this negative inductance component, the parasitic inductance (inductor L3) of the capacitor C1 can be canceled out, and the inductance component of the capacitor C1 can be made smaller in appearance. In addition, in FIG. 3, mutual inductance M (-M) for canceling inductor L3 is connected in series with capacitor C1, and mutual inductance M (+M) is added to each of first coil L1 and second coil L2. It is shown as an equivalent circuit.

The filter circuit 100 composed of the capacitor C1, the first coil L1, and the second coil L2 cancels the parasitic inductance of the capacitor C1 with a negative inductance component due to the mutual inductance M between the first coil L1 and the second coil L2. Accordingly, the effect of suppressing noise in a high frequency band can be improved.

As described above, the coil component 1 according to the embodiment includes the bobbin 2, the first wire 4, the second wire 5, and the terminals 6a to 6d. The bobbin 2 has a body part 2a around which a wire is wound, and a first collar part 2c and a second collar part 2b provided at both ends of the body part 2a. The terminals 6a to 6d are arranged on the first flange 2c and the second flange 2b, and are connected to the ends of the first wire 4 and the second wire 5, respectively. In the coil component 1, the first wire 4 and the second wire 5 are in a twisted state (twisted state) in a portion from the

terminals

6b, 6d to the point where the first wire 4 or the second wire 5 contacts the body portion 2a. ).

As a result, even if force is applied to the coil component 1 during use, the coil component 1 according to the embodiment maintains a constant distance between the first wire and the second wire and maintains a stable bonding state. The entire structure can be downsized.

In particular, in the coil component 1, R2 is the height from the body part 2a to the end surfaces of the first collar part 2c and the second collar part 2b where the terminals 6a to 6d are arranged, and the height from the body part 2a to the end surface of the second collar part 2b is It is smaller than the height R1 to the end surfaces of the first flange portion 2c and the second flange portion 2b that are not attached. As a result, in the portion where the first wire 4 and the second wire 5 intersect or are twisted (height R2 portion), the height is sufficient for the first flange 2c and the second flange 2b. In addition, the entire coil component 1 can be miniaturized by reducing the height of the first flange 2c and the second flange 2b in the portion where the height is not required (height R1 portion). can.

Further, in the coil component 1, the height R1 from the body portion 2a to the end surfaces of the first flange portion 2c and the second flange portion 2b where the terminals 6a to 6d are not arranged is the same as that of the first wire 4 or the second wire 5. It is lower than twice the diameter r1. Thereby, R1 can be prevented from becoming unnecessarily high in accordance with the diameter r1 of the first wire 4 or the second wire 5, and the overall size can be reduced.

Further, the filter circuit 100 according to the embodiment includes the above-described coil component 1 and a capacitor C1 that is electrically connected to the first wire 4 and the second wire 5 of the coil component 1. Thereby, the filter circuit 100 can cancel the parasitic inductance of the capacitor C1 and improve the noise suppression effect in the high frequency band.

<Modification 1>
It has been explained that in the coil component 1 shown in FIG. 1, the first wire 4 and the second wire 5 are in a crossed state in the region 7a, and the first wire 4 and the second wire 5 are in a twisted state in the region 7b. , the state of the first wire 4 and the second wire 5 is not limited to this. In the coil component 1A of modification example 1, the number of twists is increased compared to the coil component 1. FIG. 4 is a bottom view of a coil component 1A according to modification 1. In the coil component 1A shown in FIG. 4, the same components as the coil component 1 shown in FIG.

In the coil component 1A, the first wire 4 and the second wire 5 are twisted more in the region 7d than in the region 7b of the coil component 1. In the coil component 1A, the first wire 4 and the second wire 5 are twisted more in the region 7c than in the region 7d. Specifically, in the region 7d, the first wire 4 and the second wire 5 are twisted one turn, and in the region 7c, the first wire 4 and the second wire 5 are twisted one and a half turns. In the coil component 1A, the terminals 6a to 6d are larger than those of the coil component 1, but the structure itself is the same as that of the coil component 1.

In the coil component 1A, the number of twists in the region 7c corresponding to the beginning of winding is greater than the number of twists in the region 7d corresponding to the end of winding. In this way, the number of twists may be greater in the region corresponding to the beginning of winding than in the region corresponding to the end of winding. In the coil component 1A, by creating a twisted state in both the region 7c corresponding to the start of winding and the region 7d corresponding to the end of winding, the distance between the coils can be kept constant even if a strong external force is applied. . Note that by exchanging the

terminals

6a and 6c and placing the first wire at the same position in the Y-axis direction, the number of twists may be the same in the area corresponding to the start of winding and the area corresponding to the end of winding. .

In the coil component 1A, as shown in FIG. 4, the starting point for twisting the first wire 4 and the second wire 5 (the beginning of twisting) is approximately at the center of the bobbin 2 in the lateral direction (Y direction). be. As a result, the first wire 4 and the second wire 5 can be wound around the body portion 2a for the same length, so that the inductance value of the coil formed by the first wire 4 and the second wire 5 can be The inductance values of the coils can be made the same.

<Modification 2>
It has been explained that in the coil component 1 shown in FIG. 1, the first wire 4 and the second wire 5 are in a crossed state in the region 7a, and the first wire 4 and the second wire 5 are in a twisted state in the region 7b. , the state of the first wire 4 and the second wire 5 is not limited to this. In the coil component 1B of modification example 2, the winding start region and the winding end region are twisted, and the distance between the coils is greater than that of the coil component 1. FIG. 5 is a side view of a coil component 1B according to a second modification. FIG. 6 is a perspective view of a coil component 1B according to a second modification. In the coil component 1B shown in FIGS. 5 and 6, the same components as the coil component 1 shown in FIG.

In the coil component 1B, the same number of first wires 4 and second wires 5 are twisted in the region 7e and the region 7f. Unlike the coil component 1, the coil component 1B has

terminals

6a and 6b connected to the first wire 4 arranged at the rear side of the coil component 1B (rear side in the Y-axis direction) and connected to the second wire 5.

Terminals

6c and 6d are arranged on the front side (front side in the Y-axis direction) of the coil component 1B.

In the coil component 1B, due to such a relationship between the wire and the terminal, the first wire 4 and the second wire 5 can be wound around the body portion 2a with a distance r2 apart from each other without making them closer together than the coil component 1. can. As a result, the coil component 1B can have a lower engagement coefficient than the coil component 1 while maintaining a stable coupling state.

Since the coil component 1B is composed of one turn of wire, the distance between the wires greatly affects the coupling coefficient. By appropriately maintaining the distance between the wires wound around the body portion 2a, the coil component 1B can be adjusted so as not to increase the coupling coefficient too much, and can be designed in a desired manner.

<Aspects>
(1) The coil component of the present disclosure includes a body portion around which a wire is wound, a bobbin having a first flange portion and a second flange portion provided at both ends of the body portion, and a first wire and a second flange portion wound around the body portion. a wire, a first terminal arranged on the first collar and connected to one end of the first wire, and a second terminal arranged on the second collar and connected to the other end of the first wire. , a third terminal arranged on the first collar and connected to one end of the second wire, and a fourth terminal arranged on the second collar and connected to the other end of the second wire. Be prepared. The part from the first terminal and the third terminal until the first wire or the second wire contacts the body part, or the part from the second terminal and the fourth terminal until the first wire or the second wire contacts the body part The first wire and the second wire are twisted at at least one location.

According to the coil component of the present disclosure, the portion from the first terminal and the third terminal to the point where the first wire or the second wire comes into contact with the body portion, or from the second terminal and the fourth terminal to the first wire or the second wire. Since the first wire and the second wire are twisted in at least one place before they contact the body, the connection between the first wire and the second wire in the body can be improved without increasing the overall volume. By keeping the distance between them constant, the overall size can be reduced while maintaining a stable bonding state.

(2) In the coil component described in (1), the number of turns of the first wire in the body part and the number of turns of the second wire in the body part are one turn. Thereby, the coil component can be used in electronic circuits that flow large currents.

(3) In the coil component described in (1) or (2), the first terminal, second terminal, third terminal, and fourth terminal are all provided on the same surface of the bobbin. Thereby, the height of the flange portion can be lowered on a surface other than the same surface, and the entire coil component can be miniaturized.

(4) In the coil component according to any one of (1) to (3), on a surface other than the surface on which the first terminal, second terminal, third terminal, and fourth terminal are provided, The first wire and the second wire have no twisted portion on the body. This allows the entire coil component to be miniaturized.

(5) The coil component according to any one of (1) to (4), in which the part from the first terminal to where the first wire comes into contact with the body part, and the part from the third terminal to where the second wire comes into contact with the body part. The first wire and the second wire are twisted one or more turns before coming into contact with the body. The first wire and the second wire are twisted one or more turns in the portion from the second terminal to the point where the first wire comes into contact with the body portion, and in the portion from the fourth terminal to the point where the second wire comes into contact with the body portion. ing. As a result, the distance between the first wire and the second wire in the body can be made constant without increasing the overall volume, and the overall size can be reduced while maintaining a stable bonding state.

(6) In the coil component according to any one of (1) to (5), the positions at which the first wire and the second wire are twisted are located between the first terminal and the base point of the body. It is on the surface where the 4 terminals are placed. This can prevent the twisted portion of the wire from protruding from the surface of the coil component other than the surface on which the plurality of terminals are arranged.

(7) In the coil component according to any one of (1) to (6), the height from the body part to the surface of the first terminal to the fourth terminal is the height from the body part to the surface of the first terminal to the fourth terminal. 4 It is higher than the height to the end surface of the flange where no terminal is arranged. As a result, the part where the wire is twisted can be stored within the height from the body to the end face of the collar where multiple terminals are arranged, and the height of the part where the wire is twisted can be accommodated within the height of the end face of the collar where multiple terminals are not arranged. The height can be lowered and the whole can be made smaller.

(8) In the coil component according to any one of (1) to (7), the height from the body to the end surface of the collar where the first to fourth terminals are not arranged is Less than twice the diameter of one wire or the second wire. Thereby, by suppressing the height from the body to the end surface of the collar where a plurality of terminals are not arranged, the overall size can be reduced.

(9) A filter circuit of the present disclosure includes the coil component according to any one of (1) to (8), and a capacitor electrically connected to the first wire and the second wire of the coil component. . Thereby, the filter circuit of the present disclosure can cancel the parasitic inductance of the capacitor and improve the noise suppression effect in the high frequency band.

The embodiments disclosed this time should be considered to be illustrative in all respects and not restrictive. The scope of the present disclosure is indicated by the claims rather than the above description, and it is intended that all changes within the meaning and range equivalent to the claims are included.

1, 1A, 1B coil parts, 2 bobbin, 2a body part, 2b second flange, 2c first flange, 4 first wire, 5 second wire, 6a, 6b, 6c, 6d terminal, 100 filter circuit.

Claims

a bobbin having a body portion around which a wire is wound, and a first flange portion and a second flange portion provided at both ends of the body portion;
a first wire and a second wire wound around the body;
a first terminal disposed on the first collar and connected to one end of the first wire;
a second terminal disposed on the second collar and connected to the other end of the first wire;
a third terminal disposed on the first collar and connected to one end of the second wire;
a fourth terminal disposed on the second flange and connected to the other end of the second wire;
A portion from the first terminal and the third terminal to the point where the first wire or the second wire comes into contact with the body portion, or from the second terminal and the fourth terminal to the first wire or the second wire. A coil component, wherein the first wire and the second wire are twisted at at least one location before contacting the body portion.
The coil component according to claim 1, wherein the number of turns of the first wire on the body part and the number of turns of the second wire on the body part are one turn.
The coil component according to claim 1 or 2, wherein the first terminal, the second terminal, the third terminal, and the fourth terminal are all provided on the same surface of the bobbin.
The first wire and the second wire are twisted on the body portion in a surface other than the surface where the first terminal, the second terminal, the third terminal, and the fourth terminal are provided. The coil component according to any one of claims 1 to 3, having no portion.
In a portion from the first terminal to the point where the first wire comes into contact with the body portion, and a portion from the third terminal to the point where the second wire comes into contact with the body portion, the first wire and the second wire come into contact with the body portion. The wire is twisted more than one turn,
In a portion from the second terminal to the point where the first wire comes into contact with the body portion, and a portion from the fourth terminal to the point where the second wire comes into contact with the body portion, the first wire and the second wire come into contact with the body portion. The coil component according to any one of claims 1 to 4, wherein the wire is twisted one or more turns.
Claims 1 to 5, wherein a base point at which the first wire and the second wire are twisted is located on a surface of the body portion on which the first terminal to the fourth terminal are arranged. The coil component according to any one of the above.
The height from the body part to the surface of the first terminal to the fourth terminal is higher than the height from the body part to the end surface of the collar part where the first terminal to the fourth terminal are not arranged. , the coil component according to any one of claims 1 to 6.
1 . The height from the body portion to the end surface of the flange portion where the first terminal to the fourth terminal are not arranged is lower than twice the diameter of the first wire or the second wire. - The coil component according to any one of claims 7 to 9.
The coil component according to any one of claims 1 to 8,
A filter circuit comprising: a capacitor electrically connected to the first wire and the second wire of the coil component.