WO2024075624A1 - コイル部品、およびフィルタ回路 - Google Patents

コイル部品、およびフィルタ回路 Download PDF

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Publication number
WO2024075624A1
WO2024075624A1 PCT/JP2023/035370 JP2023035370W WO2024075624A1 WO 2024075624 A1 WO2024075624 A1 WO 2024075624A1 JP 2023035370 W JP2023035370 W JP 2023035370W WO 2024075624 A1 WO2024075624 A1 WO 2024075624A1
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WIPO (PCT)
Prior art keywords
wire
coil component
mounting
terminal
mounting terminal
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2023/035370
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English (en)
French (fr)
Japanese (ja)
Inventor
淳 東條
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Murata Manufacturing Co Ltd
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Murata Manufacturing Co Ltd
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Priority to JP2024555762A priority Critical patent/JP7831629B2/ja
Publication of WO2024075624A1 publication Critical patent/WO2024075624A1/ja
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/29—Terminals; Tapping arrangements for signal inductances

Definitions

  • This disclosure relates to a coil component and a filter circuit that implements the coil component.
  • filter circuits include EMI (Electro-Magnetic Interference) removal filters, which include a capacitor, which is a capacitance element, and a coil component in which two coils are magnetically coupled.
  • EMI Electro-Magnetic Interference
  • the coil part of Patent Document 1 is manufactured by first crimping two wires into a recess in one of the flanges, winding the two wires around the body, and finally crimping the two wires into a recess in the other flange, because the winding direction of the two magnetically coupled coils is the same. If the two wires are wound in the same direction, as in the coil part of Patent Document 1, the work is easy because the two wires can be crimped into the recess in the flange at the same time. However, if two wires are wound in opposite directions, the two wires cannot be wound around the body at the same time, and therefore the two wires cannot be crimped into the recess in the flange at the same time.
  • the objective of this disclosure is to provide a coil component in which two wires are wound in opposite directions, the coil component having an easy-to-manufacture structure, and a filter circuit in which the coil component is implemented.
  • a coil component is a coil component having a first coil and a second coil.
  • the coil component 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, a first wire wound around the body portion to form the first coil, and a second wire wound around the body portion in an opposite direction to the first wire to form the second coil.
  • the bobbin includes a plurality of mounting terminals formed on one surface of the first flange portion and the second flange portion for mounting the coil component to a substrate, and a plurality of connection terminals formed on one surface of the first flange portion and the second flange portion for connecting ends of the first wire and the second wire.
  • the first mounting terminal is formed on one surface of the first flange and is electrically connected to the first connection terminal that connects to one end of the first wire
  • the second mounting terminal is formed on one surface of the second flange and is electrically connected to the second connection terminal that connects to the other end of the first wire
  • the third mounting terminal is formed on one surface of the first flange and is electrically connected to the third connection terminal that connects to one end of the second wire
  • the fourth mounting terminal is formed on one surface of the second flange and is electrically connected to the fourth connection terminal that connects to the other end of the second wire.
  • the first connection terminal is diagonally positioned with respect to the second connection terminal
  • the third connection terminal is diagonally positioned with respect to the fourth connection terminal.
  • a filter circuit includes the coil component described above, a substrate on which the coil component is mounted, and a capacitor mounted on the substrate and having one electrode electrically connected to the second mounting terminal and the fourth mounting terminal of the coil component.
  • the first connection terminal is located diagonally relative to the second connection terminal, and the third connection terminal is located diagonally relative to the fourth connection terminal, so there is no need to cross the wires and crimp them into the recess formed in the flange, making it easier to manufacture the coil component.
  • FIG. 1 is a perspective view of a coil component according to a first embodiment
  • 11 is a perspective view of the coil component according to the first embodiment, as viewed from a different direction.
  • FIG. FIG. 2 is a bottom view of the coil component according to the first embodiment. 2 is a plan view of a substrate on which the coil component according to the first embodiment is mounted;
  • FIG. 1 is a circuit diagram of a filter circuit according to a first embodiment; 11A and 11B are diagrams for explaining the relationship between the width of a body portion and the width of a recess in a coil component.
  • 10 is a diagram for explaining the range of a connection terminal to which an end of a wire in a coil component is connected.
  • FIG. 11 is a perspective view of a coil component according to a second embodiment.
  • 11 is a perspective view of the coil component according to the second embodiment, as viewed from a different direction.
  • FIG. FIG. 11 is a bottom view of the coil component according to the second embodiment.
  • 11 is a plan view of a substrate on which a coil component according to a second embodiment is mounted.
  • FIG. 11A and 11B are diagrams for explaining the shape of a recess formed in a flange portion of a coil component.
  • 13A and 13B are diagrams for explaining recesses of different shapes formed in the flange portion of the coil component.
  • Fig. 1 is a perspective view of the coil component 1 according to the first embodiment.
  • Fig. 2 is a perspective view of the coil component 1 according to the first embodiment as viewed from another direction.
  • Fig. 3 is a bottom view of the coil component 1 according to the first embodiment.
  • 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
  • the Z-axis direction is the height direction of the coil component 1.
  • Coil component 1 is, for example, a transformer coil mounted in a filter circuit used to reduce noise in power lines. As described below, coil component 1 includes two magnetically coupled coils to cancel the parasitic inductance of a 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 portion 2a around which the wire is wound, and a first flange portion 2b and a second flange portion 2c provided at both ends of the body portion 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 a resin.
  • resin it is made of, for example, 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 a filler such as powder.
  • the body portion 2a of the bobbin 2 is, for example, shaped like a rectangular prism. Note that in this disclosure, the body portion 2a is described as a rectangular prism, but it may be a circular cylinder or a polygonal prism.
  • 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.
  • first wire 4 and the second wire 5 are wound in opposite directions around the body portion 2a to form two coils.
  • first wire 4 is wound once around the body portion 2a to form the first coil L1
  • second wire 5 is wound once around the body portion 2a to form the second coil L2.
  • first wire 4 and the second wire 5 are wound once, which is just an example, and they may be wound multiple times.
  • coil component 1 the length of the wire (the length of the wire wound around body portion 2a) and the distance between the wires have a large effect on the coupling coefficient.
  • a first wire 4 and a second wire 5 are wound around body portion 2a to keep the wire length constant in order to stabilize the coupling coefficient.
  • the coil component 1 has connection terminals 8a-8d in the recesses 7a and 7b formed in the flange portion to connect and fix the first wire 4 and the second wire 5.
  • one end of the first wire 4 is connected to the connection terminal 8a (first connection terminal) in the recess 7a formed in the first flange portion 2b by thermocompression.
  • the other end of the first wire 4 is connected to the connection terminal 8b (second connection terminal) in the recess 7b formed in the second flange portion 2c by thermocompression.
  • first connection terminal first connection terminal
  • second connection terminal second connection terminal
  • connection terminal 8a is provided at a diagonal position with respect to the connection terminal 8b.
  • the method of connecting the end of the first wire 4 to the connection terminals 8a and 8b is not limited to thermocompression, and may be, for example, laser welding.
  • the depression on one surface of the flange may be provided by forming a recess in the flange or by changing the thickness of the mounting terminal.
  • connection terminal 8c third connection terminal
  • connection terminal 8d fourth connection terminal
  • connection terminal 8d fourth connection terminal
  • the connection terminal 8c is provided diagonally with respect to the connection terminal 8d.
  • the method of connecting the end of the second wire 5 to the connection terminals 8c and 8d is not limited to thermocompression, and may be, for example, laser welding.
  • connection terminals 8a and 8b for fixing both ends of the first wire 4 are arranged on one diagonal on one surface (bottom surface) of the coil component 1, and the connection terminals 8c and 8d for fixing both ends of the second wire 5 are arranged on the other diagonal.
  • the connection terminals 8a, 8b and the connection terminals 8c, 8d are arranged in a staggered pattern on one surface (bottom surface) of the coil component 1.
  • the first wire 4 and the second wire 5 are wound around the body 2a in opposite directions, so by arranging the connection terminals 8a to 8d in a staggered pattern, it is not necessary to cross the first wire 4 and the second wire 5 at the portions where the first wire 4 and the second wire 5 are thermally compressed to the connection terminals 8a to 8d. If the first wire 4 and the second wire 5 were arranged in the same row in the width direction, the first wire 4 and the second wire 5 would cross when attempting to thermally compress the first wire 4 and the second wire 5 to the connection terminals 8a to 8d to prevent the coil winding from loosening. If the first wire 4 and the second wire 5 cross, the first wire 4 and the second wire 5 may rub against each other, causing the insulating coating to peel off and causing a short circuit between the first wire 4 and the second wire 5.
  • first wire 4 and the second wire 5 are arranged in the same line in the width direction, and then the first wire 4 and the second wire 5 are bent in the short direction of the first flange 2b and the second flange 2c to be thermocompressed in order to prevent the first wire 4 and the second wire 5 from crossing each other at the portion where the first wire 4 and the second wire 5 are thermocompressed to the connection terminals 8a to 8d, the coil winding may loosen during thermocompression, or the wire may break due to being forcibly bent.
  • connection terminals 8a to 8d are not arranged in a staggered pattern, it is difficult to thermocompress the ends of the first wire 4 and the second wire 5 to the connection terminals 8a to 8d in a direction perpendicular to the longitudinal direction of the first flange 2b and the second flange 2c (the short direction of the first flange 2b and the second flange 2c) as shown in FIG. 3.
  • connection terminals 8a to 8d in a staggered pattern as shown in FIG. 3, it is not necessary to cross the first wire 4 and the second wire 5 at the portion where the connection terminals 8a to 8d are thermally crimped to the first wire 4 and the second wire 5, making it easier to manufacture the coil component 1. Also, since it is not necessary to cross the first wire 4 and the second wire 5 at the portion where the first wire 4 and the second wire 5 are thermally crimped to the connection terminals 8a to 8d, it is also possible to form a coil using thick wires.
  • the first flange 2b and second flange 2c provided on both sides of the bobbin 2 are provided with mounting terminals 6a (first mounting terminal) and 6b (second mounting terminal) that are electrically connected to the first wire 4 and used for mounting on a substrate, and mounting terminals 6c (third mounting terminal) and 6d (fourth mounting terminal) that are electrically connected to the second wire 5 and used for mounting on a substrate.
  • the first flange 2b is provided with mounting terminals 6a and 6c
  • the second flange 2c is provided with mounting terminals 6b and 6d.
  • the surface on which the mounting terminals 6a to 6d are provided on the first flange 2b and second flange 2c is one surface (bottom surface) of the coil component 1.
  • the mounting terminal 6a is formed on one surface of the first flange 2b and is electrically connected to a connection terminal 8a that connects to one end of the first wire 4.
  • the mounting terminal 6b is formed on one surface of the second flange 2c and is electrically connected to a connection terminal 8b that connects to the other end of the first wire 4.
  • the mounting terminal 6c is formed on one surface of the first flange 2b and is electrically connected to a connection terminal 8c that connects to one end of the second wire 5.
  • the mounting terminal 6d is formed on one surface of the second flange 2c and is electrically connected to a connection terminal 8d that connects to the other end of the second wire 5.
  • the mounting terminals 6a and 6c formed on the first flange 2b are separated by the bottom surface 70 (second bottom surface) of the recess 7a as shown in FIG. 3, and are not electrically connected.
  • the mounting terminals 6b and 6d formed on the second flange 2c are connected via the recess 7b as shown in FIG. 3, and are electrically connected.
  • the mounting terminals 6a to 6d can be formed, for example, by applying Ag paste to one surface of the first flange 2b and the second flange 2c using the dip method.
  • the depth of the recesses 7a and 7b can be adjusted to electrically connect the mounting terminals 6b and 6d without electrically connecting the mounting terminals 6a and 6c.
  • the recess 7a has two bottom surfaces with different depths. Specifically, the recess 7a has a bottom surface with a depth D1 (bottom surface 70 (second bottom surface) shown in FIG. 3) and a bottom surface with a depth D2 ( ⁇ D1) that forms the connection terminals 8a and 8c (bottom surfaces 71a and 71c (first bottom surface) shown in FIG. 3).
  • the depth D1 is deeper than half the wire diameter of the first wire 4 and the second wire 5.
  • D3 a depth that forms the connection terminals 8b and 8d.
  • the depth D3 is deeper than half the wire diameter of the first wire 4 and the second wire 5.
  • the depth D3 may be smaller than the depth D1 and may be different from the depth D2.
  • connection terminals 8a-8d can be formed simultaneously, and in reality they form integrated electrodes, but in this disclosure the electrodes to which the wires are connected are defined as connection terminals.
  • the coil component 1 is a three-terminal coil component by electrically connecting the mounting terminals 6b and 6d via the recess 7b, without electrically connecting the mounting terminals 6a and 6c at the bottom surface 70 of the recess 7a. Therefore, the coil component 1 does not need to electrically connect the mounting terminals 6b and 6d on the board side.
  • FIG. 4 is a plan view of a substrate 10 on which the coil component 1 according to the first embodiment is mounted.
  • a land electrode 11a for electrically connecting with the mounting terminal 6a a land electrode 11b for electrically connecting with the mounting terminal 6b, a land electrode 11c for electrically connecting with the mounting terminal 6c, and a land electrode 11d for electrically connecting with the mounting terminal 6d are formed.
  • the land electrodes 11a to 11d on the substrate 10 with four terminals and providing the mounting terminals 6a to 6d connected to the land electrodes 11a to 11d with four terminals, it is possible to reduce the occurrence of mounting defects (for example, chip standing (Manhattan phenomenon)) due to differences in the size of the land electrodes.
  • mounting defects for example, chip standing (Manhattan phenomenon
  • the land electrode 11a is connected to the input wiring
  • the land electrode 11c is connected to the output wiring
  • a capacitor is connected to at least one of the land electrodes 11b and 11d.
  • FIG. 5 is a circuit diagram of the filter circuit 100 according to the first embodiment.
  • the filter circuit 100 is an EMI removal filter circuit, and is a third-order T-type LC filter circuit. Note that in this disclosure, a third-order T-type LC filter circuit is used as the configuration of the filter circuit 100, but a similar configuration can also be applied to a fifth-order T-type LC filter circuit or a higher-order T-type LC filter circuit.
  • the filter circuit 100 includes the coil component 1 and a capacitor C1.
  • the coil component 1 includes a mounting terminal 6a that serves as an input terminal, a mounting terminal 6c that serves as an output terminal, mounting terminals 6b and 6d that serve as intermediate terminals, a first coil L1, and a second coil L2. Note that the coil component 1 may have mounting terminal 6c as the input terminal and mounting terminal 6a as the output terminal.
  • the capacitor C1 is connected in series between the mounting terminals 6b and 6d, which are the intermediate terminals, and the ground electrode (GND).
  • the mounting terminals 6b and 6d which are the intermediate terminals
  • the ground electrode (GND) ground electrode
  • a single capacitor C1 is sufficient, a circuit configuration in which two capacitors are connected in series may also be used in anticipation of being mounted on a vehicle, etc.
  • the capacitor C1 is not limited to a multilayer ceramic capacitor whose main component is BaTiO3 (barium titanate), but may be a multilayer ceramic capacitor whose main component is another material, or may be another type of capacitor other than a multilayer ceramic capacitor, such as an aluminum electrolytic capacitor.
  • 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 is equivalent to a circuit configuration in which the inductor L3 is connected in series to the capacitor C1, as shown in FIG. 5.
  • ESL Equivalent series inductance
  • the first coil L1 and the second coil L2 are connected to the mounting terminals 6b and 6d.
  • the first coil L1 and the second coil L2 are magnetically coupled, generating a negative inductance component (mutual inductance M).
  • This negative inductance component can be used to cancel out the parasitic inductance (inductor L3) of the capacitor C1, making the inductance component of the capacitor C1 appear smaller.
  • the mutual inductance M (-M) for canceling out the inductor L3 is connected in series to the capacitor C1, and is shown as an equivalent circuit in which the mutual inductance M (+M) is added to each of the first coil L1 and the second coil L2.
  • the filter circuit 100 which is composed of the capacitor C1, the first coil L1, and the second coil L2, can improve the noise suppression effect in the high frequency band by canceling out the parasitic inductance of the capacitor C1 with the negative inductance component due to the mutual inductance M between the first coil L1 and the second coil L2.
  • FIG. 6 is a diagram for explaining the relationship between the width of the body part 2a and the width of the recess 7b in the coil part 1.
  • the width W2 of the recess 7b formed in the second flange part 2c is shorter than the width W1 of the body part 2a of the bobbin 2.
  • the width W2 of the recess 7b is shortened inward from the end of the width W1 of the body part 2a by the thickness of one wire. This makes it possible to secure a wide width W2 that serves as the crimping space while keeping the tension of the wire higher.
  • connection terminal 8a is provided within the range of the bottom surface 71a
  • connection terminal 8c is provided within the range of the bottom surface 71c.
  • the portions of the bottom surface of the recess 7a that are thermally bonded to the first wire 4 and the second wire 5 are the connection terminals 8b, 8d, the range in which the connection terminals 8a, 8c can be provided is wide.
  • connection terminals 8b, 8d are formed in the same recess 7b formed in the second flange portion 2c, but it is sufficient that the connection terminals 8b, 8d are arranged so that at least the first wire 4 and the second wire 5 do not cross each other.
  • connection terminals 8b, 8d may be arranged relative to each other within a range not exceeding halfway in the width direction of the recess 7b formed in the second flange portion 2c.
  • Figure 7 is a diagram for explaining the range of the connection terminals 8b, 8d that connect the ends of the wires in the coil component 1.
  • the connection terminals 8b, 8d may be arranged diagonally within a range not exceeding the center of the recess 7b, as shown in Figure 7.
  • the connection terminal 8b that is connected to the first wire 4 is arranged within a range of half (W2/2) of the width W2 of the recess 7b.
  • connection terminal 8d that is connected to the second wire 5 is arranged within a range of half (W2/2) of the width W2 of the recess 7b on the opposite side.
  • connection terminal 8a is positioned diagonally relative to the connection terminal 8b, and the connection terminal 8c is positioned diagonally relative to the connection terminal 8d. This makes it unnecessary to cross the first wire 4 and the second wire 5 to connect the first wire 4 and the second wire 5 to the connection terminals 8a to 8d provided in the recesses 7a and 7b, making it easier to manufacture the coil component 1.
  • mounting terminal 6b and mounting terminal 6d are electrically connected by second flange 2c, but recess 7b is provided to make the portion forming connection terminal 8b and connection terminal 8d higher than the mounting surface, so that solder does not adhere to said portion and the occurrence of mounting defects (for example, chip standing (Manhattan phenomenon)) is reduced.
  • thermocompression bonded portions oxidize, deteriorating the wettability of the solder. Therefore, by thermocompression bonding the first wire 4 and the connection terminal 8b near the wall surface of the recess 7b, and the second wire 5 and the connection terminal 8b, respectively, it is possible to stop the spread of the solder at the thermocompression bonded portions when the coil component 1 is mounted on the board 10. Therefore, when mounting the coil component 1 on the board 10 with solder, it is possible to keep the size of the solder attached to each of the mounting terminals 6a-6d the same. In addition, by taking advantage of the fact that the wettability of the solder at the thermocompression bonded portions is deteriorated, it is possible to avoid unnecessary solder attachment when mounting the coil component 1 on the board 10 with solder.
  • a deep recess 7a may be provided in the first flange 2b to prevent electrical connection between the mounting terminal 6a and the mounting terminal 6c, while a shallow recess 7b may be provided in the second flange 2c, and the electrical connection between the mounting terminal 6b and the mounting terminal 6d may be reinforced with solder.
  • the second flange 2c is used to electrically connect the two terminals, the mounting terminal 6b and the mounting terminal 6d, to form one terminal.
  • the two terminals, the mounting terminal 6b and the mounting terminal 6d may be electrically connected on the substrate 10 side, not on the coil component 1 side.
  • a coil component according to a second embodiment in which the two terminals are not electrically connected on the coil component side will be described below.
  • FIG. 8 is a perspective view of the coil component 1A according to the second embodiment.
  • FIG. 9 is a perspective view of the coil component 1A according to the second embodiment from another direction.
  • FIG. 10 is a bottom view of the coil component 1A according to the second embodiment.
  • the X-axis direction is the length direction of the coil component 1A
  • the Y-axis direction is the width direction of the coil component 1A
  • the Z-axis direction is the height direction of the coil component 1A.
  • the same components as those of the coil component 1 according to the first embodiment shown in FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description thereof will not be repeated.
  • the coil component 1A includes a bobbin 2, a first wire 4, and a second wire 5.
  • the bobbin 2 has a body portion 2a around which the wire is wound, and a first flange portion 2b and a second flange portion 2c provided on both ends of the body portion 2a.
  • first wire 4 and the second wire 5 are wound in opposite directions around the body portion 2a to form two coils.
  • first wire 4 is wound once around the body portion 2a to form the first coil L1
  • second wire 5 is wound once around the body portion 2a to form the second coil L2.
  • first wire 4 and the second wire 5 are wound once, which is just an example, and they may be wound multiple times.
  • the coil component 1A has connection terminals 8a-8d in the recesses 7a and 7c formed in the flange to connect and fix the first wire 4 and the second wire 5.
  • one end of the first wire 4 is connected to the connection terminal 8a (first connection terminal) in the recess 7a formed in the first flange 2b by thermocompression.
  • the other end of the first wire 4 is connected to the connection terminal 8b (second connection terminal) in the recess 7c formed in the second flange 2c by thermocompression. As shown in FIG.
  • connection terminal 8a is diagonally positioned with respect to the connection terminal 8b.
  • the method of connecting the end of the first wire 4 to the connection terminals 8a and 8b is not limited to thermocompression, and may be, for example, laser welding.
  • connection terminal 8c third connection terminal
  • connection terminal 8d fourth connection terminal
  • the connection terminal 8c is diagonally positioned with respect to the connection terminal 8d.
  • the method of connecting the end of the second wire 5 to the connection terminals 8c and 8d is not limited to thermocompression, and may be, for example, laser welding.
  • the mounting terminal 6a is formed on one surface of the first flange 2b and is electrically connected to a connection terminal 8a that connects to one end of the first wire 4.
  • the mounting terminal 6c is formed on one surface of the first flange 2b and is electrically connected to a connection terminal 8c that connects to one end of the second wire 5. As shown in FIG. 10, the mounting terminals 6a and 6c formed on the first flange 2b are separated by the bottom surface 70 (second bottom surface) of the recess 7a and are not electrically connected.
  • the mounting terminal 6b is formed on one surface of the second flange 2c and is electrically connected to a connection terminal 8b that connects to the other end of the first wire 4.
  • the mounting terminal 6d is formed on one surface of the second flange 2c and is electrically connected to a connection terminal 8d that connects to the other end of the second wire 5.
  • the mounting terminals 6b and 6d formed on the second flange 2c are separated by the bottom surface 72 (fourth bottom surface) of the recess 7c and are not electrically connected.
  • the recess 7a has two bottom surfaces with different depths. Specifically, the recess 7a has a bottom surface with a depth D1 (bottom surface 70 (second bottom surface) shown in FIG. 10) and a bottom surface with a depth D2 ( ⁇ D1) that forms the connection terminals 8a and 8c (bottom surfaces 71a and 71c (first bottom surface) shown in FIG. 10).
  • the recess 7c has two bottom surfaces with different depths. Specifically, the recess 7c has a bottom surface with a depth D1 (bottom surface 72 (fourth bottom surface) shown in FIG. 10) and a bottom surface with a depth D2 ( ⁇ D1) that forms the connection terminals 8b and 8d (bottom surfaces 71b and 71d (third bottom surface) shown in FIG. 10).
  • the Ag paste is not applied to the bottom surface 72 that is deeper than the bottom surfaces 71b and 71d.
  • the bottom surface 70 of the recess 7a and the bottom surface 72 of the recess 7c have been described as having the same depth D1, they may have different depths.
  • the bottom surfaces 71a and 71c of the recess 7a and the bottom surfaces 71b and 71d of the recess 7c have been described as having the same depth D2, they may have different depths.
  • Coil component 1A is a four-terminal coil component because mounting terminals 6a and 6c are not electrically connected at bottom surface 70 of recess 7a, and mounting terminals 6b and 6d are not electrically connected at bottom surface 72 of recess 7c. Therefore, when coil component 1A is used in filter circuit 100, mounting terminals 6b and 6d must be electrically connected on the board side.
  • FIG. 11 is a plan view of a substrate 10A on which coil component 1A according to embodiment 2 is mounted.
  • land electrode 11a for electrically connecting with mounting terminal 6a
  • land electrode 11b for electrically connecting with mounting terminal 6b
  • land electrode 11c for electrically connecting with mounting terminal 6c
  • land electrode 11d for electrically connecting with mounting terminal 6d
  • Substrate 10A is provided with wiring 12 for electrically connecting land electrode 11b and land electrode 11d.
  • the land electrodes 11b and 11d and the wiring 12 may be formed as one land electrode. Since the two terminals of the coil component 1A are electrically connected on the board 10A side, there is no need to worry about the orientation of the coil component 1A with respect to the board 10A, and there is no need to attach an identification mark when manufacturing the coil component 1A.
  • the coil component 1A may have the mounting terminal 6a connected to the land electrode 11d and the mounting terminal 6c connected to the land electrode 11b, and the mounting terminals 6a and 6c may be electrically connected on the board 10A side.
  • the wiring 12 may be covered with an insulating solder resist, the height of the land electrodes 11b and 11d may be made higher than the height of the wiring 12, or the wiring 12 may be provided inside the substrate 10A or on the back surface of the substrate 10A.
  • ⁇ Modification 1> 11 has a configuration in which land electrodes 11b and 11d are electrically connected by wiring 12, but it is also possible to mount a coil component 1 in which mounting terminals 6b and 6d are electrically connected on the coil component 1 side. By mounting the coil component 1 on the substrate 10A, it is possible to electrically connect mounting terminals 6b and 6d on both the coil component 1 side and the substrate 10A side, thereby providing redundancy.
  • the recess 7a formed in the first flange 2b has a two-stage bottom surface with different depths as shown in Fig. 1.
  • Fig. 12 is a diagram for explaining the shape of the recess 7a formed in the flange of the coil component 1.
  • the recess 7a has a deep bottom surface 70 (second bottom surface) and shallow bottom surfaces 71a, 71c (first bottom surfaces).
  • the deep bottom surface 70 is not coated with an electrode material (such as Ag paste), but the shallow bottom surfaces 71a and 71c are coated with an electrode material.
  • the first wire 4 and the second wire 5 are thermally bonded to the bottom surfaces 71a and 71c to which the electrode material is applied, forming the connection terminals 8a and 8c.
  • the first wire 4 and the second wire 5 may be thermally bonded to the bottom surfaces 71a and 71c, or to the wall surfaces of the recess 7a adjacent to the bottom surfaces 71a and 71c.
  • the electrode material When the electrode material is applied to the bottom surfaces 71a and 71c by dipping, the electrode material is also applied to the portions that will become the mounting terminals 6a and 6c. Therefore, the connection terminal 8a and the mounting terminal 6a are electrically connected, and the connection terminal 8c and the mounting terminal 6c are electrically connected. However, since the electrode material is not applied to the bottom surface 70, the mounting terminals 6a and 6c are not electrically connected.
  • the recess 7a has a two-step bottom surface with different depths as shown in Figure 12.
  • a method other than the dip method for example a sputtering method
  • a recess with a simple one-step bottom surface is also acceptable.
  • FIG. 13 is a diagram for explaining a recess 7d of a different shape formed in the flange portion of the coil component 1.
  • the recess 7d formed in the first flange portion 2b has a simple one-step bottom surface 75 as shown in FIG. 13.
  • the bottom surface 75 of the recess 7d may be the same depth as the bottom surface 70 of the recess 7a, or may be a different depth.
  • connection terminals 8a, 8c When forming the connection terminals 8a, 8c on the bottom surface 75 by the sputtering method, a portion of the bottom surface 75 can be provided with no electrode material applied, and the connection terminals 8a, 8c can be formed so that they are not electrically connected to each other.
  • the electrode material is applied to the portions that will become the mounting terminals 6a and 6c by the dip or sputtering method to form the mounting terminals 6a, which are electrically connected to the connection terminal 8a, and the mounting terminals 6c, which are electrically connected to the connection terminal 8c.
  • connection terminals 8a, 8c by the sputtering method, even if the bottom surface 75 is simply one step, it is possible to form the bottom surface 75 with no electrode material applied, so that the mounting terminals 6a and 6c are not electrically connected to each other.
  • the configuration of the recess 7d shown in FIG. 13 can also be applied to the recess 7c formed in the second flange portion 2c shown in FIG. 9.
  • the coil components 1 and 1A are applied to a filter circuit used in a power line, for example, it is considered that a current of about 3 A or more flows through the first wire 4 and the second wire 5, so that the DC resistance of the wire needs to be about 20 m ⁇ or less. Therefore, it is preferable that the wire diameter of the first wire 4 and the second wire 5 is about 100 ⁇ m or more. Since the coil components 1 and 1A are thermocompression-bonded to the first wire 4 and the second wire 5 at the depression, it is preferable that the depth of the depression is deeper than the thickness after the wire with a wire diameter of about 100 ⁇ m or more is crushed. For example, if the wire diameter of the first wire 4 and the second wire 5 is crushed to half by thermocompression, it is preferable that the depth of the depression is deeper than about 50 ⁇ m.
  • a coil component having a first coil and a second coil a bobbin having a body portion around which a wire is wound and a first flange portion and a second flange portion provided on both ends of the body portion; a first wire wound around the body portion to form a first coil; a second wire wound around the body portion in an opposite direction to the first wire to form a second coil;
  • the bobbin is a plurality of mounting terminals formed on one surface of the first flange portion and the second flange portion for mounting the coil component on a substrate; a plurality of connection terminals formed on one surface of the first flange portion and the second flange portion for connecting ends of the first wire and the second wire;
  • the first mounting terminal is formed on one surface of the first flange portion and is electrically connected to a first connection terminal that is connected to one end of the first wire;
  • the second mounting terminal is formed on one surface of the second flange portion and is electrically connected to a second connection terminal
  • connection terminal and the fourth connection terminal are formed in the same recess formed in the second flange portion, and are arranged so that the first wire and the second wire do not cross each other.
  • connection terminal is connected to the first wire within a range up to a halfway position in a width direction of a recess formed in the second flange portion;
  • the fourth connection terminal is connected to the second wire within a range up to a position halfway in the width direction of the recess formed in the second flange portion.
  • a filter circuit includes the coil component according to any one of (1) to (11), A substrate on which the coil components are mounted; The coil component further includes a capacitor mounted on the substrate, the capacitor having one electrode electrically connected to the second mounting terminal and the fourth mounting terminal of the coil component.
  • Another filter circuit according to the present disclosure includes the coil component according to (5); A substrate on which the coil components are mounted; The coil component further includes a capacitor mounted on the substrate, the capacitor having one electrode electrically connected to at least one of the second mounting terminal and the fourth mounting terminal of the coil component.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)
PCT/JP2023/035370 2022-10-03 2023-09-28 コイル部品、およびフィルタ回路 Ceased WO2024075624A1 (ja)

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Citations (6)

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JP2007036158A (ja) * 2005-07-29 2007-02-08 Tdk Corp インダクタンス素子及び信号伝送回路
JP2011049622A (ja) * 2009-08-25 2011-03-10 Murata Mfg Co Ltd フィルタ部品
JP2012028684A (ja) * 2010-07-27 2012-02-09 Tdk Corp コモンモードフィルタ
JP2016174058A (ja) * 2015-03-17 2016-09-29 株式会社村田製作所 巻線型チップトランスおよび分配器
JP2017041589A (ja) * 2015-08-21 2017-02-23 Tdk株式会社 コイル部品及びその製造方法、並びに、コイル部品を備える回路基板
WO2022014432A1 (ja) * 2020-07-13 2022-01-20 株式会社村田製作所 フィルタ回路および、これを含む電源装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6634943B2 (ja) 2016-04-19 2020-01-22 Tdk株式会社 ディファレンシャルモードフィルタ
US11837396B2 (en) 2018-02-05 2023-12-05 Murata Manufacturing Co., Ltd. Common-mode choke coil

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007036158A (ja) * 2005-07-29 2007-02-08 Tdk Corp インダクタンス素子及び信号伝送回路
JP2011049622A (ja) * 2009-08-25 2011-03-10 Murata Mfg Co Ltd フィルタ部品
JP2012028684A (ja) * 2010-07-27 2012-02-09 Tdk Corp コモンモードフィルタ
JP2016174058A (ja) * 2015-03-17 2016-09-29 株式会社村田製作所 巻線型チップトランスおよび分配器
JP2017041589A (ja) * 2015-08-21 2017-02-23 Tdk株式会社 コイル部品及びその製造方法、並びに、コイル部品を備える回路基板
WO2022014432A1 (ja) * 2020-07-13 2022-01-20 株式会社村田製作所 フィルタ回路および、これを含む電源装置

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