Noise Filter

Abstract

To provide a noise filter that can be miniaturized.SOLUTION: A noise filter 100 includes a terminal fitting 1, a substrate 2, a coil 3 mounted on the substrate 2, and an electronic component 5 mounted on the substrate 2. The terminal fitting 1 includes a terminal body 11 electrically connected to an external device, a coil connection portion 12 electrically connected to the coil 3 via a lead wire 4, and a substrate connection portion 13 electrically connected to the substrate 2. The coil connection portion 12 crimps the lead wire 4.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a noise filter, and more particularly to a noise filter in which a coil is mounted on a substrate. [Background technology]

[0002] The noise filter disclosed in Patent Document 1 includes a terminal block, a coil, a printed wiring board, and a case. The printed wiring board is housed in the case, facing the coil and positioned vertically, close to both outer sides of the coil. Various electronic components such as capacitors and resistors are mounted on the printed wiring board. The terminal block is located close to the upper outer side of the printed wiring board, passing through the inside and outside of the upper side of the case. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-114905 Summary of the Invention [Problem to be solved by the invention]

[0004] The inventors of the present application have discovered the following problems. When trying to reduce the width between the terminal block and the coil, there is a limit to how small the noise filter can be because a printed wiring board is provided between the terminal block and the coil, so there is room for further consideration in miniaturizing such noise filters.

[0005] In view of the above-mentioned problems, an object of the present invention is to provide a noise filter that can be made smaller. [Means for solving the problem]

[0006] The noise filter according to the present invention comprises: Terminal fittings, A substrate; a coil mounted on the substrate; and an electronic component mounted on the substrate, the terminal fitting includes a terminal body electrically connected to an external device, a coil connection portion electrically connected to the coil via a lead wire, and a board connection portion electrically connected to the board, The coil connection portion is formed by crimping the lead wire.

[0007] With this configuration, the large current and the signal current can be separated, with the large current flowing to the upper side and the signal current flowing to the lower side, which allows for a more compact design of the board, making it possible to reduce the size.

[0008] The board connection portion may support the coil connection portion, and the length from the terminal body to the coil connection portion may be shorter than the length from the terminal body to the board connection portion.

[0009] With this configuration, it is possible to stabilize the separation of the large current and the signal current.

[0010] The substrate connection portion may be located below the coil connection portion.

[0011] This configuration has the effect of preventing deformation of the terminal fitting when the coil connection part is crimped. Also, since there is no need to support the coil connection part from below with a tool or the like when crimping, the coil connection part and the coil can be brought closer together, thereby ensuring ease of assembly while reducing the size.

[0012] The board connection portion may be soldered to the board.

[0013] With this configuration, the board connection portion and the board are electrically connected, and current can be supplied to the electronic component via the board.

[0014] The board connection portion includes a plurality of wall portions rising from the board, The plurality of wall portions may support the coil connection portion.

[0015] With this configuration, the coil connection portion is supported by the multiple wall portions, so that the position of the coil connection portion is stable even when the coil connection portion is bent downward and the lead wire is crimped, thereby ensuring ease of assembly of the noise filter.

[0016] The current flowing through the coil connection portion is 30 to 60 A, The current flowing through the substrate connection portion may be 1 to 10 mA.

[0017] This configuration defines the range of current flowing through the coil connection portion and the substrate connection portion, making it possible to clearly separate large currents from signal currents.

[0018] The DC resistance from the terminal body to the coil connection portion of the terminal fitting is 0.15 to 0.25 mΩ, The DC resistance from the coil connecting portion to the board connecting portion of the terminal fitting may be 0.3 to 0.5 mΩ.

[0019] This configuration defines the range of DC resistance from the terminal body to the coil connection portion of the terminal fitting, and the range of DC resistance from the coil connection portion to the board connection portion, thereby enabling a clear separation between large currents and signal currents.

[0020] Furthermore, it is equipped with a terminal block, the terminal block supports the terminal body; The terminal fitting further includes a tongue portion extending from the terminal body to a side wall surface of the terminal block, The tongue portion has a fitting hole, The fitting hole may be fitted with a fitting tab provided on a side surface of the terminal block.

[0021] According to this configuration, the fitting holes and the fitting tabs are fitted together, so that the position of the terminal fitting relative to the terminal block is stable, and the noise filter can be easily assembled with good precision.

[0022] Further, the device includes a metal cover and an insulating plate, the metal cover covers the coil connection portion, The insulating plate may be disposed between the coil connection portion and the metal cover.

[0023] This configuration ensures an insulation distance between the metal cover and the coil connection portion, and allows for increased current or a smaller noise filter while suppressing electrical conduction between the metal cover and the coil connection portion.

[0024] The insulating plate may be characterized in that it protrudes from a terminal block that supports the terminal body to between the coil connection portion and the metal cover.

[0025] With this configuration, the insulating plate protrudes from the terminal block between the coil connection portion and the metal lid, blocking the gap between the metal lid and the coil connection portion, thereby more reliably ensuring the insulation distance between the metal lid and the coil connection portion.

[0026] The noise filter according to the present invention comprises: Terminal fittings, A substrate; a coil mounted on the substrate; and an electronic component mounted on the substrate, the terminal fitting includes a coil connection portion electrically connected to the coil via a lead wire, and a board connection portion electrically connected to the board, the coil connection portion is formed by crimping the lead wire, The substrate connection portion supports the coil connection portion.

[0027] With this configuration, the large current and the signal current can be separated, with the large current flowing to the upper side and the signal current flowing to the lower side, which allows for a more compact design of the board, making it possible to reduce the size. [Effects of the Invention]

[0028] The present invention can provide a noise filter that can be made smaller. [Brief explanation of the drawings]

[0029] [Figure 1] 1 is a perspective view showing a noise filter according to a first embodiment. [Figure 2] 1 is a perspective view showing the noise filter in accordance with Embodiment 1 with the lid removed. FIG. [Figure 3] 2 is a perspective view showing a terminal block and its periphery of the noise filter according to the first embodiment. FIG. [Figure 4] 1 is a perspective view showing a terminal block of a noise filter according to a first embodiment and a terminal metal fitting attached thereto. [Figure 5] 2 is a perspective view showing a terminal fitting of the noise filter according to the first embodiment. FIG. [Figure 6] FIG. 2 is an exploded perspective view of a terminal fitting of the noise filter according to the first embodiment. [Figure 7] 2 is a perspective view showing a relay terminal of the noise filter according to the first embodiment. FIG. [Figure 8] 1 is a circuit diagram of a noise filter according to a first embodiment. [Figure 9] 10 is a top view showing a terminal block and its periphery of the noise filter according to the second embodiment. FIG. [Figure 10] FIG. 10 is a perspective view showing a terminal block and its periphery of a noise filter according to a second embodiment. [Figure 11] FIG. 10 is a perspective view showing a terminal fitting and its periphery of a noise filter according to a second embodiment. [Figure 12] 10 is a perspective cross-sectional view showing a terminal block and its periphery of a noise filter according to a second embodiment. FIG. [Figure 13] 10 is a cross-sectional view of a terminal block and its periphery of a noise filter according to a second embodiment. FIG. [Figure 14] FIG. 10 is a perspective view showing a terminal fitting according to a related art. DETAILED DESCRIPTION OF THE INVENTION

[0030] (Related Technology) Prior to describing the embodiment, a technique related to the embodiment will be described with reference to FIG.

[0031] The terminal fitting 901 shown in FIG. 14 includes a terminal body 91, a coil connection portion 92, a male screw 91a, and a washer 91b. The male screw 91a fastens to the terminal body 91, and a connection wire of an external device (not shown) is sandwiched between the washer 91b and the terminal body 91. The terminal body 91 is electrically connected to the external device via the connection wire (not shown). The coil connection portion 92 crimps a lead wire (not shown) of a coil (not shown) and is electrically connected to the coil via the lead wire. The terminal body 91 and the coil connection portion 92 are located at approximately the same height. The terminal body 91 and the coil connection portion 92 are integrally molded by molding a single plate-like body.

[0032] The configuration of the terminal fitting 901 allows electrical connection to an external device and a coil. However, another configuration is required to electrically connect the terminal fitting to the board. When the coil connection portion 92 crimps the coil lead wire (not shown), the coil connection portion 92 may be subjected to a downward external force, causing the terminal fitting 901 to bend and move to a position lower than the terminal body 91. In addition, the terminal fitting 901 is not electrically connected to the board (not shown).

[0033] Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. In addition, the following description and drawings have been simplified as appropriate for clarity of explanation.

[0034] (Embodiment 1) The configuration of the noise filter according to the first embodiment will be described with reference to FIGS.

[0035] Fig. 1 is a perspective view showing a noise filter according to embodiment 1. Fig. 2 is a perspective view showing the noise filter shown in Fig. 1 with a lid removed.

[0036] Naturally, the right-handed XYZ coordinate system shown in Figure 1 and other drawings is for the convenience of explaining the positional relationships of the components. Normally, the positive direction of the Z axis is vertically upward, and the XY plane is a horizontal plane, which is common among the drawings.

[0037] 1 and 2, the noise filter 100 includes a terminal fitting 1, a substrate 2, a coil 3, and an electronic component 5. The noise filter 100 according to this embodiment further includes a terminal block 6 and a metal case 7.

[0038] The metal case 7 houses at least the coil 3 and the electronic component 5. The metal case 7 covers at least a portion of the terminal fitting 1, the substrate 2, and the terminal block 6. The metal case 7 may have an opening. It is preferable that at least a portion of the terminal fitting 1 and the terminal block 6 is exposed through the opening. An example of the metal case 7 shown in FIG. 1 is a substantially rectangular parallelepiped.

[0039] The metal case 7 includes a bottom plate 71 and a lid 72. The bottom plate 71 supports the substrate 2. The lid 72 is provided on the bottom plate 71 in a detachable manner.

[0040] The substrate 2 has a predetermined printed wiring pattern. The substrate 2 may have a resistor mounted thereon as appropriate. The substrate 2 mounts at least one coil 3 and at least one electronic component 5. The coil 3 is electrically connected to the terminal fitting 1 via a lead wire 4. The lead wire 4 may be an end of the coil 3, or may be a separate component connected to the end of the coil 3. The terminal fitting 1, the coil 3, and the electronic component 5 are electrically connected to each other via the printed wiring pattern of the substrate 2. The lead wire 4 is drawn out above the coil 3 (positive direction of the Z axis), allowing wiring to be performed while avoiding contact interference with other components below the coil 3.

[0041] An example of the substrate 2 shown in FIG. 2 is mounted with a plurality of coils 3 and electronic components 5. The example of the substrate 2 shown in FIG. 2 is a substantially rectangular plate. Two coils 3 are arranged at a predetermined interval in the longitudinal direction (here, the X-axis direction) of the example of the substrate 2 shown in FIG. 2. The two coils 3 are electrically connected to each other via lead wires 41 and 42. The lead wires 41 and 42 may be ends of the coil 3 or may be other components connected to the ends of the coil 3. The lead wires 41 and 42 are electrically connected to each other by a relay terminal 21. A plurality of electronic components 5 are arranged between and around the two coils 3. The electronic components 5 are, for example, capacitors. The lead wires 41 and 42 are drawn out above the coil 3 (positive direction of the Z-axis), allowing wiring to be performed while avoiding contact interference with other components below the coil 3.

[0042] Fig. 3 is a perspective view showing the terminal block and its periphery of the noise filter shown in Fig. 1. Fig. 4 is a perspective view showing the terminal block and terminal fittings attached thereto shown in Fig. 3. Note that the coil 3, lead wires 4, electronic components 5, and lid 72 are not shown in Fig. 3.

[0043] As shown in Figures 3 and 4, the terminal block 6 and the board 2 are stacked on the end 71a of the bottom plate 71. The terminal block 6 has a terminal holding portion 6a, a flange 6b, and a groove 6c. The terminal block 6 has at least one terminal holding portion 6a, which holds the terminal fitting 1. As will be described later, a large current flows through the coil 3 and the lead wire 4. Therefore, the coil 3 and the lead wire 4 are thick and resistant to deformation. Therefore, it is preferable to align the height of the terminal holding portion 6a with the positions of the coil connection portion 12 and the lead wire 4, as this facilitates electrical connection between the coil connection portion 12, the lead wire 4, and the coil 3. The flange 6b extends from the bottom of the terminal block 6. The flange 6b of the terminal block 6, the board 2, and the end 71a of the bottom plate 71 are fastened together by a bolt 6d. The bottom plate 71, the board 2, and the terminal block 6 are stacked in this order. The groove 6c may have a shape that can fit into the opening of the lid 72 of the metal case 7. A transparent cover 61 is provided above the terminal holding portion 6a of the terminal block 6. By fitting the groove 6c into the opening of the lid 72 of the metal case 7, the terminal block 6 is fixed not only by the bolts 6d fastening the flange 6b, the board 2, and the end 71a of the bottom plate 71, but also by the metal case 7. Therefore, stress from the terminal block 6 is distributed and transmitted to the metal case 7, the board 2, the bottom plate 71, and the board connection portion 13. This makes it possible to prevent stress from being applied to the soldered portion of the board connection portion 13.

[0044] Fig. 5 is a perspective view showing the terminal fitting shown in Fig. 4. Fig. 6 is an exploded perspective view of the terminal fitting shown in Fig. 5. As shown in Figs. 5 and 6, the terminal fitting 1 includes a terminal body 11, a coil connection portion 12, and a board connection portion 13. An example of a portion of the terminal body 11, the coil connection portion 12, and the board connection portion 13 shown in Figs. 5 and 6 is formed integrally by molding a single plate-like body.

[0045] An example of the terminal fitting 1 shown in Figures 5 and 6 extends in a substantially L-shape that is upside down and left and right on the front surface (here, the ZX plane) of the noise filter 100. The terminal body 11 is located in the terminal holding portion 6a of the terminal block 6. The coil connection portion 12 is located on the coil 3 side of the terminal block 6. The coil connection portion 12 extends from the terminal body 11 to the coil 3 side of the terminal block 6. The coil connection portion 12 is located at substantially the same height as the terminal body 11. The board connection portion 13 is located below the coil connection portion 12. It is preferable that the board connection portion 13 supports the coil connection portion 12.

[0046] The terminal body 11 has a hole 11c. The hole 11c has a female thread portion. The terminal body 11 is provided with a male screw 11a and a washer 11b. The male screw 11a passes through the washer 11b and fastens to the female thread portion of the hole 11c. The washer 11b is supported by a spring (not shown). When the male screw 11a is loosened, the washer 11b is pushed upward by the spring (not shown), and the male screw 11a moves upward due to the pressure of the washer 11b. A washer such as a spring washer or a flat washer may be provided between the male screw 11a and the washer 11b. A connection wire (not shown) is sandwiched between the washer 11b and the terminal body 11, and the male screw 11a is fastened to the washer 11b. The terminal body 11 can then be electrically connected to an external device (not shown) via the connection wire. The external device is, for example, a power supply. The terminal body 11 further includes a tongue portion 14, and the tongue portion 14 has a fitting hole 14a. The terminal body 11 and the washer 11b may be fixed to the terminal block 6 by fitting a fitting tab (not shown) extending from the terminal block 6 into the fitting hole 14a. In addition, in the second embodiment described later, a specific example of a fixing method for fixing the male screw 11a and the washer 11b to the terminal block 6 by snap-fitting using the fitting hole 14a will be shown.

[0047] The coil connection portion 12 crimps the lead wire 4. FIGS. 3 to 6 show an example of the coil connection portion 12 before the lead wire 4 is crimped. The example of the coil connection portion 12 shown in FIGS. 5 and 6 includes a lead wire holding portion 12a and a claw 12b. The lead wire holding portion 12a holds the lead wire 4, and the claw 12b is bent toward the lead wire holding portion 12a. The lead wire holding portion 12a and the claw 12b tighten and fix the lead wire 4. In this way, the example of the coil connection portion 12 crimps the lead wire 4. After the example of the coil connection portion 12 crimps the lead wire 4, the example of the coil connection portion 12 and the lead wire 4 may be soldered together. By performing such soldering, the example of the coil connection portion 12 and the lead wire 4 are reliably electrically connected. Furthermore, the lead wire 4 can be firmly fixed to the example of the coil connection portion 12.

[0048] The substrate connection portion 13 includes a plurality of wall portions 13a and a plurality of soldered portions 13b. The wall portions 13a rise from the substrate 2 and support the coil connection portion 12. The substrate connection portion 13 is soldered to the substrate 2. Specifically, the plurality of soldered portions 13b each protrude downward (here, in the negative Z-axis direction) from the wall portions 13a. The plurality of soldered portions 13b each pass through a plurality of holes in the substrate 2 and are soldered to the substrate 2 on the lower surface of the substrate 2.

[0049] The length L13 from the terminal body 11 to the board connection portion 13 of the terminal fitting 1 is specifically the length from the terminal body 11 to the soldered portion 13b. The length L13 is preferably longer than the length L12 from the terminal body 11 to the coil connection portion 12 of the terminal fitting 1. When the length L13 is longer than the length L12, the DC resistance R13 from the terminal body 11 to the board connection portion 13 of the terminal fitting 1 is higher than the DC resistance R12 from the terminal body 11 to the coil connection portion 12 of the terminal fitting 1. Specifically, the range of the DC resistance R12 is, for example, 0.15 to 0.25 mΩ. The range of the DC resistance R23 from the coil connection portion 12 to the board connection portion 13 of the terminal fitting 1 is, for example, 0.3 to 0.5 mΩ. The DC resistance R13 (=R12+R23) from the terminal body 11 to the board connection portion 13 of the terminal fitting 1 ranges, for example, from 0.45 to 0.75 mΩ. The DC resistance R13 is higher than the DC resistance R12. The ratio of the DC resistance R13 to the DC resistance R12 is, for example, from 1.8 to 5. When the DC resistances R12, R13, and R23 are set within the above ranges, the current flowing through the coil 3 becomes a large current, i.e., a current flowing in a power line, and the current flowing through the electronic component 5 becomes a signal current, i.e., a current flowing in a signal line. The signal current is weak and smaller than the large current. The current flowing through the coil connection portion 12 may be, for example, 30 to 60 A. The current flowing through the board connection portion 13 may be, for example, 1 to 10 mA. That is, a power supply, which is an external device electrically connected to the terminal body 11 of one of the terminal fittings 1, applies a voltage to an electric circuit including one of the two terminal bodies 11. A large current caused by this voltage flows through the terminal body 11 and the coil connection part 12 to one of the two coils 3, and then flows through the relay terminal 21 to the other coil 3. The current then flows to another external device (not shown) via the coil connection portion 12 and terminal body 11 of the other terminal fitting 1. The other external device (not shown) is a load. Meanwhile, the signal current flowing through the electronic component 5 on the board 2 flows to the board via the terminal body 11, coil connection portion 12, and board connection portion 13. The current then flows to the other external device (not shown) via the board connection portion, coil connection portion 12, and terminal body 11 of the other terminal fitting 1.

[0050] Fig. 7 is a perspective view showing a relay terminal of the noise filter shown in Fig. 1. As shown in Fig. 7, relay terminal 21 includes lead wire holding portion 21a, claw 21b, wall portions 21c and 21d, and a plurality of soldered portions 21e. An example of lead wire holding portion 21a, claw 21b, wall portions 21c and 21d, and soldered portions 21e shown in Fig. 7 are integrally formed by molding a single plate-like body.

[0051] The relay terminals 21, 21 respectively crimp the lead wires 41, 42 shown in FIG. 2 . FIG. 7 shows an example of the relay terminal 21 before the lead wires 41, 42 are crimped. Specifically, the lead wire holding portion 21a holds the lead wires 41, 42, while the claws 21b are bent toward the lead wire holding portion 21a. The lead wire holding portion 21a and the claws 21b clamp and fix the lead wires 41, 42. In this way, the relay terminal 21 crimps the lead wires 41, 42. The relay terminal 21 electrically connects the lead wires 41 and 42 to each other, relaying the lead wires 41 and 42. After the relay terminal 21 crimps the lead wires 41, 42, the relay terminal 21 and the lead wires 41, 42 may be soldered together. By performing such soldering, the relay terminal 21 and the lead wires 41, 42 are reliably electrically connected to each other. In addition, the lead wires 41, 42 can be firmly fixed to the relay terminal 21.

[0052] The walls 21c and 21d extend from the lead wire holding portion 21a toward the substrate 2. In other words, the walls 21c and 21d rise from the substrate 2 and support the lead wire holding portion 21a.

[0053] The plurality of soldering portions 21e are soldered to the substrate 2. Specifically, the plurality of soldering portions 21e protrude downward (here, in the negative Z-axis direction) from the walls 21c and 21d. The plurality of soldering portions 21e each pass through a plurality of holes in the substrate 2 and are soldered to the substrate 2 on the lower surface of the substrate 2.

[0054] As described above, the coil 3 and the electronic component 5 are electrically connected via the terminal fitting 1, the printed wiring pattern of the substrate 2, and the relay terminal 21, thereby forming an electric circuit. An example of this formed electric circuit is shown in FIG. 8. FIG. 8 is a circuit diagram of the noise filter shown in FIG. 1. In the example of the electronic circuit shown in FIG. 8, the electronic component 5 is a capacitor. In the example of the electronic circuit shown in FIG. 8, resistors R1, R2, R3, R4, R5, R6, R7, R8, and R9 are resistors mounted on the substrate 2. The current flowing through the coil 3 is larger than the current flowing through the capacitor (electronic component 5) and the current flowing through the resistors R1 to R9. The current flowing through the coil 3 is a large current, similar in magnitude to the current flowing through the power line, for example, 30 to 60 A. The current flowing through the capacitor (electronic component 5) and the current flowing through the resistors R1 to R9 is weak and similar in magnitude to the current flowing through the signal line, for example, 1 to 10 mA.

[0055] As described above, the noise filter 100 has a configuration in which power or a signal can be supplied from an external device (not shown) to the coil 3 and the electronic component 5 via the terminal fitting 1. Specifically, a large current generated by a voltage from an external device, i.e., a power supply (not shown), can be supplied to the external device, i.e., a load (not shown), after removing common-mode noise via the coil 3. Furthermore, common-mode and normal-mode noise components on this line can be suppressed by passing them through the board connection portion 13 to the electronic component 5 on the board 2. Furthermore, because the board connection portion 13 of the terminal fitting 1 is located below the coil connection portion 12, the coil connection portion 12 and the coil 3 can be brought closer together. This allows for a more compact design. Furthermore, because the board connection portion 13 of the terminal fitting 1 is located below the coil connection portion 12, the coil connection portion 12 crimps the lead wire 4. Therefore, after the terminal fitting 1 is moved downward to be installed on the board 2, the coil connection portion 12 can be bent downward to crimp the lead wire 4. That is, the terminal fitting 1 and the coil 3 are easily electrically connected via the lead wire 4. This ensures ease of assembly. That is, the configuration of the noise filter 100 ensures ease of assembly while also enabling miniaturization.

[0056] Furthermore, according to the configuration of the noise filter 100 of this embodiment, the board connection portion 13 is located below the coil connection portion 12 and supports the coil connection portion 12. This has the effect of preventing the terminal fitting 1 from being deformed when the coil connection portion 12 is crimped. Furthermore, since there is no need to support the coil connection portion 12 from below using a tool or the like when crimping, the coil connection portion 12 and the coil 3 can be placed close to each other, thereby ensuring ease of assembly while reducing the size.

[0057] Furthermore, according to the configuration of the noise filter 100 of this embodiment, the board connection portion 13 is soldered to the board 2. This provides a stable electrical connection between the board connection portion 13 and the board 2. This allows noise components from external devices and power sources to be stably supplied to the electronic component 5 via the terminal fitting 1 and the board 2, and can be reliably removed.

[0058] Furthermore, according to the configuration of the noise filter 100 of this embodiment, the board connection portion 13 includes a plurality of wall portions 13a, and the plurality of wall portions 13a support the coil connection portion 12. Therefore, when the claws 12b of the coil connection portion 12 are bent downward to crimp the lead wire 4, the coil connection portion 12 receives a reaction force from the support of the plurality of wall portions 13a, and the position of the coil connection portion 12 in the height direction is stabilized. Therefore, the lead wire 4 can be easily crimped.

[0059] Furthermore, according to the configuration of the noise filter 100 of this embodiment, the opening of the lid 72 fits into the groove 6c of the terminal block 6. Furthermore, the flange 6b of the terminal block 6, the substrate 2, and the end 71a of the bottom plate 71 are fastened together with bolts 6d. Furthermore, the terminal fitting 1 is held by the terminal holding portion 6a of the terminal block 6. As a result, the relative positions of the terminal fitting 1 and the substrate 2 are stabilized, and the soldered joint between the soldered portion 13b of the substrate connecting portion 13 and the substrate 2 can be maintained.

[0060] (Embodiment 2) Next, the configuration of the noise filter according to the second embodiment will be described with reference to Figs. 9 to 13. Fig. 9 is a top view showing the terminal block and its periphery of the noise filter according to the second embodiment. Fig. 10 is a perspective view showing the terminal block and its periphery shown in Fig. 9. Fig. 11 is a perspective view showing the terminal fittings and its periphery of the noise filter shown in Fig. 9. Fig. 12 is a perspective cross-sectional view showing the terminal block and its periphery of the noise filter shown in Fig. 9. Fig. 13 is a cross-sectional view of the terminal block and its periphery shown in Fig. 12. Note that the cover 72 is not shown in Figs. 9 and 11 to 13. Furthermore, the terminal holding portion 6a and the like are not shown in Fig. 11.

[0061] The noise filter 200 shown in FIG. 9 has the same configuration as the noise filter 100 shown in FIG. 1, except that the terminal block 6 includes an insulating plate 6e and a fitting claw 6f.

[0062] 9 and 10 , the terminal block 6 of the noise filter 200 includes an insulating plate 6e. The insulating plate 6e is provided on the coil 3 side of the terminal block 6. More specifically, the insulating plate 6e protrudes from the upper part of the terminal block 6 to between the lid 72 of the metal case 7 and the coil connection portion 12.

[0063] The insulating plate 6e has insulating properties. The insulating plate 6e is preferably made of an insulating material, such as rubber or plastic. The shape and size of the insulating plate 6e are preferably set so as to ensure an insulating distance between the terminal fitting 1 and the lid 72 of the metal case 7. For example, when the noise filter 200 is viewed from above, the area covered by the insulating plate 6e should preferably include the coil connection portion 12.

[0064] As shown in FIGS. 12 and 13, the terminal block 6 of the noise filter 200 includes a mating claw 6f. The mating claw 6f is provided on the terminal holding portion 6a. The mating claw 6f has a shape that allows it to fit into the mating hole 14a. The mating claw 6f is elastically deformable. When the terminal fitting 1 is placed in the terminal holding portion 6a, the tongue portion 14 is positioned within the terminal holding portion 6a and comes into contact with the mating claw 6f. The mating claw 6f then elastically deforms, and the mating hole 14a fits into the mating claw 6f.

[0065] As described above, according to the configuration of the noise filter 200, the insulating plate 6e protrudes between the lid 72 of the metal case 7 and the coil connection portion 12. This ensures an insulating distance between the terminal fitting 1 and the lid 72 of the metal case 7. This makes it possible to suppress electrical connection between the terminal fitting 1 and the lid 72 of the metal case 7. This configuration is particularly suitable when a large voltage is applied to the terminal fitting 1 or when the terminal fitting 1 and the metal case 7 are placed close to each other in order to reduce the size of the noise filter 200.

[0066] Furthermore, according to the configuration of the noise filter 200, by placing the terminal fitting 1 in the terminal holding portion 6a of the terminal block 6, the fitting claws 6f fit into the fitting holes 14a, thereby stabilizing the position and orientation of the terminal fitting 1 relative to the terminal block 6. This improves the ease of assembly of the noise filter 200.

[0067] Furthermore, according to the configuration of noise filter 200, the opening of lid 72 fits into groove 6c of terminal block 6. Furthermore, terminal fitting 1 is held by terminal holding portion 6a of terminal block 6. As a result, the relative positions of terminal fitting 1 and lid 72 are stabilized, and an insulating distance between terminal fitting 1 and lid 72 can be ensured.

[0068] The present invention is not limited to the above-described embodiment and can be modified as appropriate without departing from the spirit and scope of the present invention. The present invention may also be embodied by appropriately combining the above-described embodiment and examples thereof. For example, the terminal block 6 of the noise filter 100 shown in FIG. 1 may have a mating claw 6f, similar to the terminal block 6 of the noise filter 200 shown in FIG. 11. Unlike the noise filter 100, the noise filter 200 may not have an electronic component 5. Unlike the noise filter 100, the noise filter 200 may have a terminal fitting different from the terminal fitting 1. The terminal fitting may have a terminal body 11 and a coil connection portion 12. [Explanation of symbols]

[0069] 100, 200 Noise Filter 1, 901 terminal fittings 11, 91 Terminal body 11a, 91a Male thread 11b, 91b Washer 11c hole 12, 92 Coil connection 12a Lead wire holding part 12b Claw 13 Board connection part 13a Wall portion 13b Soldering portion 14 Tongue part 14a Fitting hole 2 boards 21 Relay terminal 21a Lead wire holding portion 21b Claw 21c, 21d wall portion 21e soldered portion 3 coils 4, 41, 42 leads 5. Electronic Components 6 Terminal block 6a Terminal holding part 6b Flange 6c groove 6d bolt 6e Insulating plate 6f Mating tab 61 Transparent cover 7 Metal Case 71 Bottom plate 71a End 72 Lid L12, L13 length R12, R13, R23 DC resistance R1-R9 resistance

Claims

1. Terminal fittings, A substrate; a coil mounted on the substrate; an electronic component mounted on the substrate; a terminal block; the terminal fitting includes a terminal body electrically connected to an external device, a coil connection portion electrically connected to the coil via a lead wire, and a board connection portion electrically connected to the board, the coil connection portion is formed by crimping the lead wire, the terminal block supports the terminal body; The terminal fitting further includes a tongue portion extending from the terminal body to a side wall surface of the terminal block, The tongue portion has a fitting hole, The fitting hole is fitted with a fitting tab provided on a side surface of the terminal block. Noise filter.

2. the substrate connection portion supports the coil connection portion.

2. The noise filter according to claim 1.

3. The length from the terminal body to the coil connection portion is shorter than the length from the terminal body to the board connection portion.

3. The noise filter according to claim 1 or 2.

4. The substrate connection portion is located below the coil connection portion.

4. The noise filter according to claim 1, wherein the first and second electrodes are electrically connected to each other.

5. The substrate connection portion is soldered to the substrate.

5. The noise filter according to claim 1, wherein the first and second electrodes are electrically connected to each other.

6. the board connection portion includes a plurality of wall portions rising from the board, the plurality of wall portions support the coil connection portion.

6. The noise filter according to claim 1, wherein the first and second electrodes are electrically connected to each other.

7. The current flowing through the coil connection portion is 30 to 60 A, The current flowing through the substrate connection portion is 1 to 10 mA.

7. The noise filter according to claim 1, wherein the first and second electrodes are electrically connected to each other.

8. The DC resistance from the terminal body to the coil connection portion of the terminal fitting is 0.15 to 0.25 mΩ, The DC resistance from the coil connection portion to the board connection portion of the terminal fitting is 0.3 to 0.5 mΩ.

8. The noise filter according to claim 1, wherein the first and second electrodes are electrically connected to each other.

9. Further, the device includes a metal cover and an insulating plate, the metal cover covers the coil connection portion, The insulating plate is disposed between the coil connection portion and the metal cover.

9. The noise filter according to claim 1, wherein the first and second electrodes are electrically connected to each other.

10. The insulating plate protrudes from a terminal block supporting the terminal body to between the coil connection portion and the metal cover.

10. The noise filter according to claim 9.

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