Core unit

Abstract

To provide a core unit that can suppress noise while allowing a large current to flow through a current-carrying conductor.SOLUTION: A core unit 10 includes: a core 20 having a through hole 18; an electric current path 16 including a first conductor portion 22 composed of a strip-shaped metal flat plate wrapped around the core 20; and a capacitor 24 connected to the first conductor portion 22. The first conductor portion 22 includes: a first member 36 penetrating the through hole 18 of the core 20 and protruding from one axial side of the core 20 to the other axial side; a second member 38 connected to the first member 36 on the other axial side of the core 20 and protruding around the outer periphery of the core 20 to one axial side; and a third member 40 connected to the second member 38 on the one axial side of the core 20 and penetrating the through hole 18 of the core 20 without contact with the first member 36 and protruding to the other axial side of the core 20. At least one capacitor 24 is grounded or connected in parallel between a + line 17a and a - line 17b of the electric current path 16.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a core unit. [Background technology]

[0002] Conductors such as wire harnesses that make up power lines connecting in-vehicle devices are subject to relatively high-frequency common-mode noise generated from the metal housings and internal circuit boards of the devices, as well as relatively low-frequency normal-mode noise generated by the switching operations of electrical devices. As a result, the conductors themselves act like antennas, emitting radiated noise or receiving noise that adversely affects the control of peripheral devices.

[0003] As a countermeasure against such noise, Patent Document 1 proposes a method of suppressing radiation noise by inserting a cable into an annular ferrite core and then winding the cable around the core one or several times. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-343620 Summary of the Invention [Problem to be solved by the invention]

[0005] However, with a structure in which a cable is wound around a ring-shaped core as in Patent Document 1, it is difficult to pass a large current, and there has been a demand for a core unit that can accommodate the increasing currents required for in-vehicle devices in recent years.

[0006] Therefore, a core unit is disclosed that can suppress noise while allowing a large current to flow through the current-carrying conductor. [Means for solving the problem]

[0007] The core unit of the present disclosure comprises a core having a through hole, an electric current path including a first conductor portion made of a strip-shaped metal flat plate wrapped around the core, and at least one capacitor connected to the first conductor portion, wherein the first conductor portion has: a first member that penetrates the through hole of the core and protrudes from one axial side of the core to the other axial side; a second member that is connected to the first member on the other axial side of the core and protrudes around the outer periphery of the core to the one axial side; and a third member that is connected to the second member on the one axial side of the core and penetrates the through hole of the core without contacting the first member and protrudes to the other axial side of the core, and the at least one capacitor is connected to ground or in parallel between the + line and - line of the electric current path. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to provide a core unit that can suppress noise while allowing a large current to flow through a current-carrying conductor. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of a core unit according to a first embodiment, as viewed from the front side. [Figure 2] FIG. 2 is a perspective view of the core unit shown in FIG. 1 as seen from the rear side. [Figure 3] FIG. 3 is a plan view of the core unit shown in FIG. [Figure 4] FIG. 4 is a front view of the core unit shown in FIG. [Figure 5] 5 is an enlarged longitudinal cross-sectional view showing the VV cross section in FIG. [Figure 6] FIG. 6 is an exploded perspective view of the core unit shown in FIG. [Figure 7] FIG. 7 is a circuit diagram showing an electrical configuration of the core unit shown in FIG. [Figure 8]FIG. 8 is a perspective view showing the core unit according to the second embodiment from the top side. [Figure 9] FIG. 9 is a perspective view of the core unit shown in FIG. 8 from the bottom side. [Figure 10] FIG. 10 is an exploded perspective view of the core unit shown in FIG. [Figure 11] FIG. 11 is a perspective view of the core unit according to the third embodiment, as viewed from the front side. [Figure 12] 12 is a vertical cross-sectional view of the core unit shown in FIG. 11, and corresponds to FIG. [Figure 13] FIG. 13 is a circuit diagram showing an electrical configuration of the core unit shown in FIG. [Figure 14] FIG. 14 is a perspective view of the core unit according to the fourth embodiment, seen from the front side. [Figure 15] 15 is a perspective view of the core unit shown in FIG. 14 as seen from the rear side. [Figure 16] FIG. 16 is a circuit diagram showing an electrical configuration of the core unit shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] <Description of Embodiments of the Present Disclosure> First, embodiments of the present disclosure will be listed and described. The core unit of the present disclosure comprises: (1) A current path including a core having a through hole, a first conductor portion made of a strip-shaped metal flat plate wound around the core, and at least one capacitor connected to the first conductor portion, wherein the first conductor portion has: a first member that passes through the through hole of the core and protrudes from one axial side of the core to the other axial side; a second member that is connected to the first member on the other axial side of the core and protrudes around the outer periphery of the core to the one axial side; and a third member that is connected to the second member on the one axial side of the core and passes through the through hole of the core without contacting the first member and protrudes to the other axial side of the core, and the at least one capacitor is connected to ground or in parallel between the + line and - line of the current path.

[0011] According to the core unit of the present disclosure, the current path is configured to include a first conductor portion wound around the core, and the first conductor portion is configured from a strip-shaped metal flat plate. This allows for a larger current to be passed than in conventional cases where the conductor portion is configured from a cable. For example, the thickness and width of the first conductor portion can be easily adjusted to suit the expected current value, allowing for reliable support for the passage of a large current.

[0012] In addition, the first conductor portion includes a first member that penetrates the through hole of the core and protrudes from one axial side of the core to the other axial side, a second member that is connected to the first member on the other axial side and circles around the outer periphery of the core and protrudes to the one axial side, and a third member that is connected to the second member on the one axial side of the core and penetrates the through hole of the core without contacting the first member and protrudes to the other axial side of the core. This allows the first conductor portion to be wound around the core via two turn portions, each formed by the connection portion between the first member and the second member and the connection portion between the second member and the third member. Because the effect of inductance is proportional to the square of the number of turns, high inductance can be ensured in the first conductor portion wound around the core via two turn portions, thereby improving noise attenuation characteristics.

[0013] Furthermore, at least one capacitor is connected in parallel between the + and - lines of the ground or current path, which allows noise to be bypassed to the ground side or between the + and - lines depending on the expected noise, further improving noise attenuation characteristics.

[0014] (2) In the above (1), it is preferable that the current path includes a second conductor portion made of a strip-shaped metal flat plate wrapped around the core, the first conductor portion constituting the + line of the current path, the second conductor portion constituting the - line of the current path, and the second conductor portion having a fourth member penetrating the through hole of the core and protruding from one axial side of the core to the other axial side, a fifth member connected to the fourth member on the other axial side of the core and protruding around the outer periphery of the core to the one axial side, and a sixth member connected to the fifth member on the one axial side of the core and penetrating the through hole of the core without contacting the fourth member and protruding to the other axial side of the core.

[0015] In addition to the first conductor portion constituting the positive line of the current path, the second conductor portion constituting the negative line is also made of a metal plate, which further enhances the current path's ability to carry large currents. Furthermore, because both the first and second conductor portions are wound around the core via two turns, high inductance is ensured in both the positive and negative lines, improving noise attenuation characteristics. Additionally, the first conductor portion constituting the positive line and the second conductor portion constituting the negative line of the current path are wound around a single core in opposite directions. This allows for the construction of an inductor that generates large impedance due to the sum of magnetic fluxes when common-mode noise currents flow in the same direction through the first and second conductor portions. This allows for the provision of a core unit that can carry large currents through the current path and further improves noise attenuation characteristics.

[0016] (3) In the above (2), it is preferable that an insulating spacer extending through the through hole is further provided, and the spacer is disposed between the first conductor portion and the second conductor portion. This is because the first conductor portion and the second conductor portion can be passed through the through hole of one core while avoiding contact between them. More preferably, by providing the spacer with accommodation grooves or the like for each member constituting each conductor portion and positioning them, it is possible to improve assembly ease and ensure reliable positioning of each member.

[0017] (4) In any one of (1) to (3) above, it is preferable that the at least one capacitor includes a plurality of capacitors, and that the plurality of capacitors are all arranged on one axial side of the core. When a plurality of capacitors are used to achieve a noise reduction effect, the core unit can be made smaller by arranging the capacitors together on one axial side of the core. In addition, by arranging a plurality of capacitors on one side of the core, it is possible to connect the capacitors at positions before and after one conductor portion turns around the core, thereby further improving noise attenuation characteristics.

[0018] (5) In (4) when citing (2) above, it is preferable that the plurality of capacitors include a first line bypass capacitor and a second line bypass capacitor, the first line bypass capacitor is connected to the first member, the fourth member, and the ground line, and the second line bypass capacitor is connected to the second member or the third member, the fifth member or the sixth member, and the ground line. By arranging the first and second line bypass capacitors on one axial side of the core unit, a core unit that is more effective in countering common-mode noise can be provided in a space-saving manner.

[0019] (6) In the above (5), it is preferable that the first line bypass capacitor and the second line bypass capacitor are mounted on a single printed circuit board, a pair of first terminals constituting the first line bypass capacitor and a pair of second terminals constituting the second line bypass capacitor are protruding from the printed circuit board, protruding ends of the pair of first terminals are connected to the first member and the fourth member, respectively, and protruding ends of the pair of second terminals are connected to the second member or the third member and the fifth member or the sixth member, respectively.Since the first and second line bypass capacitors are configured to be disposed on one axial side of the core unit, the first and second line bypass capacitors can be mounted on a single printed circuit board, and the use of common components can save space and reduce size.

[0020] (7) In the above (6), it is preferable that the connection portion between the second member and the third member and the connection portion between the fifth member and the sixth member each include a bolt fastening portion, and that the protruding ends of the pair of second terminals are bolt-fastened to the respective connection portions at the bolt fastening portions. The first to third members of the first conductor and the fourth to sixth members of the second conductor can be easily fastened by bolt fastening. Therefore, for example, when the connection portion between the second member and the third member and the connection portion between the fifth member and the sixth member are bolt-fastened at the bolt fastening portions, the protruding ends of the pair of second terminals protruding from the printed circuit board can be fastened together to the bolt fastening portions, thereby further reducing the number of parts, saving space, and simplifying the process. Note that the protruding ends of the pair of first terminals may also be bolt-fastened to the first member and the fourth member.

[0021] (8) In the above (5), the first line bypass capacitor and the second line bypass capacitor are held in a single insulating holding case, the first line bypass capacitor includes a pair of first capacitor components, a pair of first terminals, and a ground bus bar, the second line bypass capacitor includes a pair of second capacitor components, a pair of second terminals, and the ground bus bar, the holding case has a pair of first capacitor component accommodating portions, a pair of first terminal accommodating portions, a pair of second capacitor component accommodating portions, a pair of second terminal accommodating portions, and a ground bus bar accommodating portion, one end of each of the first terminals accommodated in each first terminal accommodating portion is exposed at a bottom surface of the first capacitor component accommodating portion, and one end of each of the second terminals accommodated in each second terminal accommodating portion is exposed at a bottom surface of the first capacitor component accommodating portion. Preferably, one end of the ground bus bar accommodated in the ground bus bar accommodation section is exposed on the bottom surface of each of the pair of first capacitor component accommodation sections and the pair of second capacitor component accommodation sections, four points of the ground bus bar accommodated in the ground bus bar accommodation section are exposed on the bottom surfaces of the pair of first capacitor component accommodation sections and the pair of second capacitor component accommodation sections, each of the first capacitor components accommodated in each of the first capacitor component accommodation sections is connected in series between the respective first terminal and the ground bus bar, each of the second capacitor components accommodated in each of the second capacitor component accommodation sections is connected in series between the respective second terminal and the ground bus bar, protruding ends of the pair of first terminals are connected to the first member and the fourth member, respectively, and protruding ends of the pair of second terminals are connected to the second member or the third member and the fifth member or the sixth member, respectively.

[0022] Since the first and second line bypass capacitors are located on one axial side of the core unit, the first and second line bypass capacitors can be configured by housing the terminals, bus bars, and capacitor components in a single insulating holding case, which allows for space savings and miniaturization through component sharing. In particular, the ground line for each capacitor can be configured with a single ground bus bar held in the holding case, allowing for even greater miniaturization.

[0023] (9) In the above (8), it is preferable that the connection portion between the second member and the third member and the connection portion between the fifth member and the sixth member each include a bolt fastening portion, and that the protruding ends of the pair of second terminals are bolted to the respective connection portions at the bolt fastening portions. The first to third members of the first conductor and the fourth to sixth members of the second conductor can be easily fastened by bolt fastening. Therefore, for example, when the connection portion between the second member and the third member and the connection portion between the fifth member and the sixth member are bolted together at the bolt fastening portions, the protruding ends of the pair of second terminals protruding from the printed circuit board can be fastened together to the bolt fastening portions, thereby further reducing the number of parts, saving space, and simplifying the process. Note that the protruding ends of the pair of first terminals may also be bolted to the first member and the fourth member.

[0024] (10) In (4) when citing (2) above, it is preferable that the plurality of capacitors include a first across-the-line capacitor and a second across-the-line capacitor, the first across-the-line capacitor being connected to the first member and the fourth member, and the second across-the-line capacitor being connected to the second member or the third member and the fifth member or the sixth member. By arranging the first and second across-the-line capacitors on one axial side of the core unit, it is possible to provide a core unit that is more effective in countering normal mode noise while saving space.

[0025] (11) In the above (10), it is preferable that the first across-the-line capacitor and the second across-the-line capacitor are mounted on a single printed circuit board, a pair of first terminals constituting the first across-the-line capacitor and a pair of second terminals constituting the second across-the-line capacitor are protruding from the printed circuit board, protruding ends of the pair of first terminals are connected to the first member and the fourth member, respectively, and protruding ends of the pair of second terminals are connected to the second member or the third member and the fifth member or the sixth member, respectively. Since the first and second across-the-line capacitors are configured to be disposed on one axial side of the core unit, the first and second across-the-line capacitors can be mounted on a single printed circuit board, and the use of common components can save space and reduce size.

[0026] (12) In (4) when citing (2) above, the first conductor portion further includes a seventh member connected to the third member on the other axial side of the core, going around the outer periphery of the core and protruding to one axial side of the core, and an eighth member connected to the seventh member on the one axial side of the core, passing through the through hole of the core without contacting the first member and the third member and protruding to the other axial side of the core, and the second conductor portion is connected to the sixth member on the one axial side of the core, going around the outer periphery of the core and protruding to the other axial side of the core. and a tenth member connected to the ninth member on the other axial side of the core, passing through the through hole of the core without contacting the fourth member and the sixth member, and protruding toward one axial side of the core; and it is preferable that, on the one axial side of the core, the capacitors are connected to the first member of the first conductor portion and the seventh member or the eighth member, respectively, and the capacitors are connected to the fourth member of the second conductor portion and the ninth member or the tenth member, respectively.

[0027] Two more turns are added to each of the first conductor section that forms the positive line of the current path and the second conductor section that forms the negative line, ensuring higher inductance and improving noise attenuation characteristics.In addition, capacitors can be connected to the first and second conductor sections before the turns and at the position with the most turns, further improving noise attenuation characteristics.

[0028] <Details of the embodiment of the present disclosure> Specific examples of the core unit of the present disclosure will be described below with reference to the drawings. Note that the present disclosure is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope of the claims.

[0029] <Embodiment 1> A core unit 10 according to a first embodiment of the present disclosure will be described below with reference to FIGS. 1 to 7. The core unit 10 includes an electric path 16 between a power source 12 (see FIG. 7) and a load 14 (see FIG. 7), such as an inverter, in an electric vehicle or a hybrid vehicle, and can reduce noise in the current flowing through the electric path 16. Note that the core unit 10 can be arranged in any orientation within the vehicle, but in the following description, the upper side will be referred to as the upper side in FIG. 4, the lower side as the lower side in FIG. 4, the left side as the lower side in FIG. 3, the right side as the upper side in FIG. 3, the front side as the right side in FIG. 3, and the rear side as the left side in FIG. 3. Note that, in some cases, when multiple identical components are shown, only some of the components will be designated by reference numerals, and the reference numerals will be omitted for the other components.

[0030] <Core Unit 10> The core unit 10 includes a core 20 having a through hole 18, an electric current path 16 including a first conductor portion 22 made of a strip-shaped flat metal plate wound around the core 20, and at least one capacitor 24 connected to the first conductor portion 22. The core unit 10 of the first embodiment includes, in addition to the first conductor portion 22, a second conductor portion 26 made of a strip-shaped flat metal plate wound around the core 20, and the first conductor portion 22 and the second conductor portion 26 form the electric current path 16. In particular, in the first embodiment, the first conductor portion 22 forms a + line 17a (see FIG. 7) of the electric current path 16, and the second conductor portion 26 forms a − line 17b (see FIG. 7) of the electric current path 16.

[0031] <Core 20> The core 20 may be, for example, a known soft magnetic core made of ferrite, amorphous, or the like. In the first embodiment, the core 20 has an outer shape that is a substantially rounded rectangle or a substantially oval shape in which the vertical dimension is larger than the horizontal dimension in the longitudinal cross section shown in FIG. 5, and has a predetermined front-to-rear dimension. A through hole 18 is formed in the center of the core 20, penetrating it in the front-to-rear direction. As shown in FIG. 5, the cross section of the through hole 18 has a substantially rounded rectangle shape in which the vertical dimension is larger than the horizontal dimension. This makes the core 20 an annular member as a whole.

[0032] The core 20 is housed in a core case 28. The core case 28 is made of, for example, a synthetic resin and includes an outer portion 30 that completely covers the outside of the core 20, and an inner portion 32 that is located inside the through-hole 18 and covers the core 20 from the inside. An insertion hole 34 is formed in the center of the inner portion 32, penetrating in the front-to-rear direction, and through which a spacer 128 (described later) (and a first member 36, a third member 40, a fourth member 82, and a sixth member 86 held by the spacer 128) is inserted. In the first embodiment, the outer portion 30 and the inner portion 32 are integrally formed, and, for example, the core case 28 may be formed as an integrally molded product including the core 20. Note that, for example, the core 20 and the core case 28 may each be composed of multiple members, and the core case 28 with the core 20 housed therein may be formed by assembling the multiple members.

[0033] <First conductor portion 22> The first conductor portion 22 has a first member 36 that penetrates the through hole 18 of the core 20 and protrudes from one axial side (front side) of the core 20 to the other axial side (rear side). The first conductor portion 22 also has a second member 38 that is connected to the first member 36 on the other axial side (rear side) of the core 20 and that wraps around the outer periphery of the core 20 and protrudes to the one axial side (front side). The first conductor portion 22 also has a third member 40 that is connected to the second member 38 on the one axial side (front side) of the core 20 and penetrates the through hole 18 of the core 20 without contacting the first member 36 and protrudes to the other axial side (rear side) of the core 20.

[0034] These first to third members 36, 38, 40 all have a rectangular cross section and are configured as bus bars having predetermined length and thickness dimensions, and are made of, for example, copper (including copper alloy) or aluminum (including aluminum alloy).

[0035] The first member 36 is a member that extends substantially straight in the front-rear direction, and a through-hole 42 that penetrates the first member 36 in the thickness direction (left-right direction) is formed at the front end of the first member 36. As will be described later, this through-hole 42 is used to connect conductive members such as electric wires and bus bars on the power source 12 side to the front end of the first member 36 with bolts or the like (not shown). Therefore, the portion of the front end of the first member 36 surrounding the through-hole 42 forms a first front connection portion 44. In addition, a stud bolt 46 is disposed in a portion of the first member 36 rearward of the through-hole 42, and this stud bolt 46 protrudes leftward from the first member 36. The rear portion of the first member 36 is inserted into the through-hole 18 of the core 20 and is covered by the core 20, and the rear end of the first member 36 protrudes rearward beyond the core 20. A stud bolt 48 is disposed in the rear end of the first member 36, and this stud bolt 48 protrudes leftward from the first member 36. The portion of the rear end of the first member 36 around the stud bolt 48 is a first rear connection portion 50 that is overlapped and connected to the second member 38 .

[0036] A through-hole 52 is formed at the rear end of the second member 38, penetrating the second member 38 in the thickness direction (left-right direction). The area surrounding this through-hole 52 expands into a generally rectangular plate shape, forming a second rear connection portion 54 that is connected to the rear end (first rear connection portion 50) of the first member 36. That is, the first member 36 and the second member 38 are connected to each other by inserting a stud bolt 48 into the through-hole 52, and fastening a nut 56 to the stud bolt 48 with the first rear connection portion 50 and the second rear connection portion 54 overlapping each other. Therefore, the first member 36 and the second member 38 are connected by a bolt fastening portion 58 that includes the stud bolt 48 and the nut 56. A vertical wall portion 60 that bends to the left is formed and connected to the front end of the second rear connection portion 54.

[0037] Furthermore, a through-hole 62 is formed at the front end of the second member 38, penetrating the second member 38 in the thickness direction. The area surrounding this through-hole 62 expands into a generally rectangular plate shape, forming a second front connection portion 64 that is connected to the front end of the third member 40 (a third front connection portion 72, described later). A vertical wall portion 66 that bends to the left is connected to the rear end of the second front connection portion 64. These front and rear vertical walls 66, 60 are positioned at different positions in the up-down direction, with the rear vertical wall portion 60 being positioned higher than the front vertical wall portion 66. The left ends of these vertical walls 60, 66 are connected to each other by an inclined wall portion 68. That is, the inclined wall portion 68 is gradually inclined downward as it extends forward.

[0038] The third member 40 is a member that extends substantially straight in the front-rear direction, and a stud bolt 70 is disposed at the front end of the third member 40. The stud bolt 70 protrudes leftward from the third member 40, and a third front connection portion 72 is formed by a portion that extends substantially in the shape of a rectangular plate around the stud bolt 70. That is, the second member 38 and the third member 40 are connected to each other by inserting the stud bolt 70 into the through hole 62 in the second member 38 and fastening a nut 74 to the stud bolt 70 with the second front connection portion 64 and the third front connection portion 72 overlapping each other. Therefore, the second member 38 and the third member 40 are connected by a bolt fastening portion 76 that includes the stud bolt 70 and the nut 74. Furthermore, a through hole 78 that penetrates the third member 40 in the thickness direction (left-right direction) is formed at the rear end of the third member 40. As will be described later, this through hole 78 is used to connect the conductive member on the load 14 side to the rear end of the third member 40 using a bolt or the like (not shown), and the area surrounding the through hole 78 at the rear end of the third member 40 forms a third rear connection portion 80.

[0039] As described above, the first conductor 22 is formed by connecting the first to third members 36, 38, and 40. In the first conductor 22, the first member 36 penetrates the inside of the core 20 and extends from front to rear, and the second member 38 is connected to the bolt fastening portion 58 and extends from rear to front on the outside of the core 20. The third member 40 is connected to the second member 38 at the bolt fastening portion 76 and penetrates the inside of the core 20 and extends from front to rear. In this manner, the first conductor 22 is wound around the core 20, making two turns. In the first embodiment, assuming that the first conductor 22 extends from the first member 36 at the front toward the third member 40 at the rear, the first conductor 22 is wound around the core 20 counterclockwise in the plan view shown in FIG. 3 .

[0040] <Second conductor portion 26> The second conductor portion 26 has a shape symmetrical to the first conductor portion 22 with respect to the spacer 128 (described later) sandwiched therebetween, and therefore will only be briefly described. The second conductor portion 26 has a fourth member 82 that penetrates the through hole 18 of the core 20 and protrudes from one axial side (front side) of the core 20 to the other axial side (rear side) of the core 20. The second conductor portion 26 also has a fifth member 84 that is connected to the fourth member 82 on the other axial side (rear side) of the core 20 and that wraps around the outer periphery of the core 20 and protrudes to the one axial side (front side). The second conductor portion 26 also has a sixth member 86 that is connected to the fifth member 84 on the one axial side (front side) of the core 20 and that penetrates the through hole 18 of the core 20 without contacting the fourth member 82 and protrudes to the other axial side (rear side) of the core 20. As the material for the fourth to sixth members 82, 84, and 86, the same material as that for the first to third members 36, 38, and 40 can be used.

[0041] The fourth member 82 has a through hole 88 at its front end, and the portion surrounding the through hole 88 is a fourth front connection portion 90 that is connected to a conductive member on the power source 12 side. A stud bolt 92 protrudes to the right from a portion of the fourth member 82 rearward of the through hole 88. A stud bolt 94 protrudes to the right from the rear end of the fourth member 82, and the portion surrounding the stud bolt 94 is a fourth rear connection portion 96.

[0042] A through hole 98 is formed in the rear end of the fifth member 84, and the portion surrounding the through hole 98 is a fifth rear connection portion 100. The fourth rear connection portion 96 and the fifth rear connection portion 100 are overlapped and connected by inserting a stud bolt 94 into the through hole 98 and fastening a nut 102 to the stud bolt 94. Therefore, the fourth member 82 and the fifth member 84 are connected by a bolt fastening portion 104 that includes the stud bolt 94 and the nut 102. A vertical wall portion 106 that bends to the right is formed and connected to the front end of the fifth rear connection portion 100.

[0043] A through hole 108 is formed in the front end of the fifth member 84, and the portion surrounding the through hole 108 is a fifth front connecting portion 110. A vertical wall portion 112 that bends to the right is formed and connected to the rear end of the fifth front connecting portion 110. The right ends of these vertical walls 106, 112 are connected to each other by an inclined wall portion 114. The inclined wall portion 114 is inclined gradually downward as it extends forward.

[0044] A stud bolt 116 is disposed at the front end of the sixth member 86, and the area surrounding the stud bolt 116 constitutes a sixth front connection portion 118. The fifth front connection portion 110 and the sixth front connection portion 118 are overlapped and connected by inserting the stud bolt 116 into the through hole 108 and fastening a nut 120 to the stud bolt 116. Therefore, the fifth member 84 and the sixth member 86 are connected by a bolt fastening portion 122 that includes the stud bolt 116 and the nut 120. In addition, a through hole 124 is formed at the rear end of the sixth member 86, and the area surrounding the through hole 124 constitutes a sixth rear connection portion 126 that is connected to a conductive member on the load 14 side.

[0045] As described above, the fourth to sixth members 82, 84, and 86 are connected to form the second conductor 26, which is arranged in parallel with the first conductor 22. In the second conductor 26, the fourth member 82 penetrates the inside of the core 20 and extends from front to rear, and the fifth member 84 is connected to the bolt fastening portion 104 and extends from rear to front on the outside of the core 20. The sixth member 86 is connected to the fifth member 84 at the bolt fastening portion 122 and penetrates the inside of the core 20 and extends from front to rear. In this manner, the second conductor 26 is arranged so as to make two turns around the core 20. In the first embodiment, assuming that the second conductor 26 extends from the fourth member 82 at the front toward the sixth member 86 at the rear, the second conductor 26 is wound around the core 20 clockwise in the plan view shown in FIG. 3 . That is, the first conductor portion 22 and the second conductor portion 26 are wound around the core 20 in opposite directions.

[0046] <Spacer 128> In the first embodiment, the core unit 10 further includes an insulating spacer 128 extending through the through hole 18, and the spacer 128 is disposed between the first conductor portion 22 and the second conductor portion 26. In particular, in the first embodiment, the core 20 is housed in the core case 28, and the spacer 128 is adapted to be inserted into the insertion hole 34 in the core case 28. Specifically, the spacer 128 is formed to have a size capable of holding the first conductor portion 22 and the second conductor portion 26, and is formed of, for example, a synthetic resin.

[0047] More specifically, a first member accommodating recess 130 and a third member accommodating recess 132 are formed independently of each other in the left portion of the spacer 128, and these recesses 130 and 132 accommodate the first member 36 and the third member 40 of the first conductor portion 22, respectively. The first member and third member accommodating recesses 130 and 132 are each a bottomed recess that extends in the front-to-rear direction and opens to the left, with the first member accommodating recess 130 located forward and above the third member accommodating recess 132. In other words, the first member 36 is located forward and above the third member 40. Furthermore, the through holes 42 and 78 formed in the first member 36 and the third member 40 are covered by bottoms 133 of the first member and third member accommodating recesses 130 and 132, respectively, and are bottomed recesses that open to the left.

[0048] Furthermore, a left wall portion 134 is provided in the spacer 128 at a portion that is inserted into the insertion hole 34 and covered by the core 20 and the core case 28. The left wall portion 134 covers, from the outside (left side), the first and third members 36, 40 that are housed and disposed in the respective housing recesses 130, 132. The left wall portion 134 is formed in a shape that generally corresponds to the left portion of the inner circumferential surface of the insertion hole 34.

[0049] Similarly, a fourth member accommodating recess 136 and a sixth member accommodating recess 138 are formed independently of each other in the right portion of the spacer 128, and these recesses respectively accommodate the fourth member 82 and the sixth member 86 of the second conductor portion 26. The fourth member accommodating recess 136 and the sixth member accommodating recess 138 are each a bottomed recess that extends in the front-to-rear direction and opens to the right, with the fourth member accommodating recess 136 located forward and above the sixth member accommodating recess 138. Furthermore, the through holes 88, 124 formed in the fourth member 82 and the sixth member 86 are covered by bottoms 133 of the fourth member and sixth member accommodating recesses 136, 138, respectively, and are bottomed recesses that open to the right. That is, the first member accommodating recess 130 and the fourth member accommodating recess 136 are formed at corresponding positions in the left-right direction and face each other across the common bottom 133. The third component accommodating recess 132 and the sixth component accommodating recess 138 are formed at corresponding positions in the left-right direction, and face each other with a common bottom portion 133 in between.

[0050] Furthermore, a right wall portion 140 is provided in the spacer 128 at a portion that is inserted into the insertion hole 34 and covered by the core 20 and the core case 28, covering from the outside (right side) the fourth and sixth members 82, 86 that are housed and disposed in the respective housing recesses 136, 138. The right wall portion 140 is formed in a shape that generally corresponds to the right portion of the inner circumferential surface of the insertion hole 34. By forming the left wall portion 134 and the right wall portion 140 in shapes that correspond to the left and right portions of the inner circumferential surface of the insertion hole 34, respectively, rattling of the spacer 128 (and the first, third, fourth, and sixth members 36, 40, 82, 86 held by the spacer 128) within the insertion hole 34 can be prevented.

[0051] Although the method for forming the spacer 128 is not limited, in the first embodiment, the spacer 128 is formed as an integrally molded product that integrally includes the first, third, fourth, and sixth members 36, 40, 82, and 86 and the stud bolts 46, 48, 70, 92, 94, and 116.

[0052] <Capacitor 24> A known capacitor is used as the capacitor 24, and therefore a detailed description of the internal structure, etc. is omitted. In the first embodiment, a plurality of capacitors 24 are provided, and each of these capacitors 24 is disposed on one axial side (front side) of the core 20.

[0053] Specifically, each capacitor 24 includes, on each of the positive and negative lines of the current path 16 extending from the power source 12 to the load 14, a first line bypass capacitor 142 provided on a path that bypasses to ground potential (e.g., grounded (earthed)) on the power source 12 side, and a second line bypass capacitor 144 provided on a path that bypasses to ground potential (e.g., grounded (earthed)) on the load 14 side. In the first embodiment, the first line bypass capacitor 142 and the second line bypass capacitor 144 are mounted on a single printed circuit board 146. The printed circuit board 146 has a substantially rectangular plate shape, and an electric circuit (not shown) is printed on, for example, the upper surface of the printed circuit board 146. The printed circuit board 146 is disposed below the first conductor portion 22 and the second conductor portion 26.

[0054] <First line bypass capacitor 142> Furthermore, in the first embodiment, the power supply 12 is connected to the first front connection part 44 and the fourth front connection part 90, and a first line bypass capacitor 142 is connected to the first member 36 and the fourth member 82. In other words, the first line bypass capacitor 142 is connected to the first member 36, the fourth member 82, and a ground line 148 (see FIG. 7) that leads to the ground potential.

[0055] More specifically, the first line bypass capacitor 142 includes a pair of first terminals 150, 150. Each first terminal 150 is formed, for example, by a bus bar, and one end of the first terminal 150 is electrically connected to an electric circuit on the printed circuit board 146 and protrudes upward from the printed circuit board 146. A bolt insertion hole 152 is formed in the other end of each first terminal 150. Stud bolts 46, 92 protruding outward in the left-right direction from the first and fourth members 36, 82 are inserted into each bolt insertion hole 152, and a nut 154 is fastened, thereby connecting the protruding end (upper end) of each first terminal 150 to the first and fourth members 36, 82. Note that one end (lower end) of each first terminal 150 is fastened to the printed circuit board 146 by a bolt 156, thereby being fixed to the printed circuit board 146 and electrically connected to the electric circuit.

[0056] In particular, in the first embodiment, the first line bypass capacitor 142 includes a pair of first capacitor components 158, 158. Each first capacitor component 158 ​​is disposed on the printed circuit board 146, with one terminal electrically connected to a corresponding first terminal 150 via an electrical circuit on the printed circuit board 146 and the other terminal electrically connected to the ground line 148 via the electrical circuit. These first capacitor components 158 are disposed spaced apart from each other in the left-right direction in the front portion of the printed circuit board 146. That is, the left first capacitor component 158 ​​is connected to the first member 36 via the first terminal 150, and the right first capacitor component 158 ​​is connected to the fourth member 82 via the first terminal 150. Each first capacitor component 158 ​​is connected to a common ground line 148.

[0057] <Second line bypass capacitor 144> Furthermore, a second line bypass capacitor 144 is connected to the third and sixth members 40, 86, which are located closer to the load 14 than the first and fourth members 36, 82. In other words, the second line bypass capacitor 144 is connected to the third member 40, the sixth member 86, and the ground line 148.

[0058] More specifically, the second line bypass capacitor 144 includes a pair of second terminals 160, 160. Each second terminal 160 is configured, for example, by a bus bar, and one end of the second terminal 160 is electrically connected to an electric circuit on the printed circuit board 146 and protrudes upward from the printed circuit board 146. A bolt insertion hole 162 is formed in the other end of each second terminal 160. Stud bolts 70, 116 protruding outward in the left-right direction from the third and sixth members 40, 86 are inserted into the bolt insertion holes 162, and nuts 74, 120 are fastened, thereby connecting the protruding end (upper end) of each second terminal 160 to the third and sixth members 40, 86. That is, in the first embodiment, the protruding end (upper end) of each second terminal 160 is bolted to each connecting portion by the bolt fastening portions 76, 122 that connect the second member 38 (second front connecting portion 64) and the third member 40 (third front connecting portion 72), and the fifth member 84 (fifth front connecting portion 110) and the sixth member 86 (sixth front connecting portion 118). Note that each second terminal 160 is fastened at one end (lower end) to the printed circuit board 146 by a bolt 164, thereby being fixed to the printed circuit board 146 and electrically connected to the electric circuit.

[0059] In particular, in the first embodiment, the second line bypass capacitor 144 includes a pair of second capacitor components 166, 166. Each second capacitor component 166 is disposed on the printed circuit board 146, with one terminal electrically connected to a corresponding second terminal 160 via an electrical circuit on the printed circuit board 146 and the other terminal electrically connected to the ground line 148 via the electrical circuit. These second capacitor components 166 are disposed at a rear portion of the printed circuit board 146, spaced apart from each other in the left-right direction. That is, the left second capacitor component 166 is connected to the third member 40 via the second terminal 160, and the right second capacitor component 166 is connected to the sixth member 86 via the second terminal 160. Each second capacitor component 166 is connected to a common ground line 148.

[0060] In short, in the first embodiment, one first capacitor component 158 ​​or one second capacitor component 166 is connected to each of the first, third, fourth, and sixth members 36, 40, 82, and 86 held by the spacer 128. Each of the first capacitor components 158 and each of the second capacitor components 166 is connected to the ground line 148.

[0061] In the first embodiment, a bolt 168 is inserted into the printed circuit board 146, and this bolt 168 is fastened to a boss portion 172 in a metal housing 170 such as a chassis of a vehicle. As a result, the electric circuit in the printed circuit board 146 is connected to the ground potential (earth connection), and the bolt 168 is included in the ground line 148.

[0062] <Assembly of Core Unit 10> The following describes a specific example of a method for assembling the core unit 10. However, the method for assembling the core unit 10 is not limited to the embodiment described below.

[0063] First, the core 20 is set in the molding cavity of the core case 28, and the molding cavity is filled with resin material for the core case 28 to obtain an integrally molded core case 28 including the core 20. Then, the core case 28 including the core 20, the first, third, fourth, and sixth members 36, 40, 82, and 86, and the stud bolts 46, 48, 70, 92, 94, and 116 are set in the molding cavity of the spacer 128, and the molding cavity is filled with resin material for the spacer 128 to obtain an integrally molded spacer 128 including these members. As a result, the spacer 128 including the first, third, fourth, and sixth members 36, 40, 82, and 86 is inserted into the insertion hole 34 of the core case 28, and the first, third, fourth, and sixth members 36, 40, 82, and 86 protrude from the core case 28 on both sides in the axial (front-rear) direction.

[0064] Next, the second rear connection portion 54 of the second member 38 is overlapped with the first rear connection portion 50 of the first member 36, the stud bolt 48 is inserted into the through hole 52, and a nut 56 is fastened to the stud bolt 48. In addition, the second front connection portion 64 of the second member 38 and the other end of the second terminal 160 are overlapped with the third front connection portion 72 of the third member 40, the stud bolt 70 is inserted into the through hole 62 and the bolt insertion hole 162, and a nut 74 is fastened to the stud bolt 70. This connects the second member 38 to the first member 36 and the third member 40, and also connects the second terminal 160 to the second member 38 and the third member 40.

[0065] Similarly, the fifth rear connection portion 100 of the fifth member 84 is overlapped with the fourth rear connection portion 96 of the fourth member 82, the stud bolt 94 is inserted into the through hole 98, and a nut 102 is fastened to the stud bolt 94. Furthermore, the fifth front connection portion 110 of the fifth member 84 and the other end of the second terminal 160 are overlapped with the sixth front connection portion 118 of the sixth member, the stud bolt 116 is inserted into the through hole 108 and the bolt insertion hole 162, and a nut 120 is fastened to the stud bolt 116. This connects the fifth member 84 to the fourth member 82 and the sixth member 86, and also connects the second terminal 160 to the fifth member 84 and the sixth member 86.

[0066] Thereafter, the stud bolts 46, 92 of the first and fourth members 36, 82 are inserted into the bolt insertion holes 152 at the other end of each first terminal 150, and nuts 154 are fastened to the stud bolts 46, 92. This connects each first terminal 150 to the first and fourth members 36, 82. One end of each first terminal 150 and each second terminal 160 is then fixed by bolts 156, 164 to the printed circuit board 146 on which each first capacitor component 158 ​​and each second capacitor component 166 are mounted. As a result, the core unit 10 of embodiment 1 is completed.

[0067] The core unit 10 manufactured as described above is fixed to the metal housing 170 by inserting bolts 168 through the printed circuit board 146 and fastening them to boss portions 172 on the metal housing 170. As a result, the first to sixth members 36, 38, 40, 82, 84, 86 are connected to ground (e.g., earth) via the first and second terminals 150, 160 and the first and second capacitor components 158, 166, respectively.

[0068] <Effects of Core Unit 10> In the first embodiment, the first conductor 22 (first to third members 36, 38, 40) and the second conductor 26 (fourth to sixth members 82, 84, 86) are wound in opposite directions around the annular core 20. Therefore, the core 20, the first conductor 22, and the second conductor 26 act as a common mode choke coil.

[0069] A circuit diagram of a specific example of a circuit using the core unit 10 of embodiment 1 is shown in Fig. 7. In Fig. 7, the upper side is the first conductor portion 22 (+ line 17a) and the lower side is the second conductor portion 26 (- line 17b).

[0070] Specifically, the positive terminal and negative terminal extending from the power source 12 are connected to the first forward connection 44 of the first member 36 and the fourth forward connection 90 of the fourth member 82. The first member 36 and the fourth member 82 branch off midway along their paths and are connected to the ground line 148 (bolt 168) via the first terminals 150 and the first line bypass capacitors 142 (first capacitor components 158) (part C1 in FIG. 7). The first member 36 and the fourth member 82, which are inserted through the core 20 (core case 28), are connected to the second member 38 and the fifth member 84, respectively, and run around the outer periphery of the core 20 (core case 28). The opposing portions of the first member 36 and the second member 38, and the fourth member 82 and the fifth member 84 form a coil wound around the core 20 (part L1 in FIG. 7).

[0071] Furthermore, the second member 38 and the fifth member 84 branch off at the second forward connection portion 64 and the fifth forward connection portion 110, respectively, and are connected to the ground line 148 (bolt 168) through the second terminals 160 and the second line bypass capacitors 144 (second capacitor components 166) (part C2 in FIG. 7). The third member 40 and the sixth member 86, which are connected to the second member 38 and the fifth member 84, respectively, extend rearward through the inner periphery of the core 20 (core case 28), and the third rear connection portion 80 and the sixth rear connection portion 126 are connected to the positive terminal and the negative terminal on the load 14 side, respectively. The opposing portions of the second member 38 and the third member 40, and the fifth member 84 and the sixth member 86, respectively, form a coil wound around the core 20 (part L2 in FIG. 7).

[0072] In particular, in the first embodiment, it is assumed that common-mode noise occurs, and because common-mode noise currents flow in the same direction in the first conductor portion 22 and the second conductor portion 26, noise currents also flow in the same direction in the first, third, fourth, and sixth members 36, 40, 82, and 86 inserted in the core 20, generating a summed magnetic flux B as shown in Fig. 5, and generating a large impedance in the portion constituting the coil (the portion L1 and L2 in Fig. 7). Therefore, the circuit shown in Fig. 7 is configured as if two CL filters each composed of a capacitor and an inductor (coil) are connected in series, and even when a signal (current) containing noise flows in the first conductor portion 22 and the second conductor portion 26, noise components mainly composed of high frequencies are prevented from passing through the inductors (L1 and L2) and are released to ground via the capacitors (C1 and C2). Furthermore, signal components that are mainly composed of low frequencies do not easily pass through the capacitors (C1, C2) but easily pass through the inductors (L1, L2), so that stable current flow between the power supply 12 and the load 14 can be achieved.

[0073] According to the core unit 10 configured as described above, the first conductor portion 22 wound around the core 20 constituting the common mode choke coil is made up of the first to third members 36, 38, and 40, all of which are bus bars, and therefore a larger current can flow than when the first conductor portion is made up of, for example, an electric wire. A path branching from the path made up of the first conductor portion 22 extending from the power source 12 to the load 14 to a ground potential via the capacitor 24 (first line bypass capacitor 142 and second line bypass capacitor 144) is provided. This allows the capacitor 24 (first line bypass capacitor 142 and second line bypass capacitor 144) and the inductors (L1 and L2) to form a low-pass filter, which can remove noise components mainly consisting of high frequencies.

[0074] Similarly, since the second conductor portion 26 is configured from the fourth to sixth members 82, 84, and 86, which are all bus bars, it is possible to provide a core unit 10 that can handle large currents. Also, a path that branches off from the path formed by the second conductor portion 26 and leads to the ground potential via the capacitors 24 (first line bypass capacitor 142 and second line bypass capacitor 144) is provided. This makes it possible to remove noise components from the current flowing through the second conductor portion 26 as well.

[0075] A spacer 128 is disposed between the first conductor portion 22 and the second conductor portion 26. This makes it possible to stably insulate the first conductor portion 22 from the second conductor portion 26. In particular, by providing the spacer 128 with respective accommodating recesses 130, 132, 136, 138 for accommodating the first, third, fourth, and sixth members 36, 40, 82, 86, and inserting the spacer 128 into the core 20 (core case 28), it is possible to prevent the members 36, 40, 82, 86 from rattling relative to the core 20.

[0076] The capacitor 24 of the core unit 10 includes a first line bypass capacitor 142 and a second line bypass capacitor 144 (i.e., C1 and C2), and the first conductor portion 22 and the second conductor portion 26 are configured to make two turns (i.e., L1 and L2) around the core 20. This allows for a structure in which two CL filters made of a capacitor and an inductor are arranged in series, thereby more reliably achieving the noise attenuation effect.

[0077] The first line bypass capacitor 142 and the second line bypass capacitor 144 are both arranged on one axial side (front side) of the core 20. This simplifies and reduces the size of the structure of the core unit 10. In particular, even in the structure in which two CLs are connected in series as described above, it is possible to avoid an increase in size.

[0078] Furthermore, the first line bypass capacitor 142 and the second line bypass capacitor 144 are mounted on a common printed circuit board 146, and the first conductor portion 22 and the second conductor portion 26 are connected to a common ground line 148 (bolt 168) through the printed circuit board 146. This simplifies the structure and reduces the number of parts.

[0079] The protruding end (upper end) of each second terminal 160 is fastened together and fixed at the bolt fastening portion 76 between the second member 38 and the third member 40 and at the bolt fastening portion 122 between the fifth member 84 and the sixth member 86. This makes it possible to further simplify the structure and reduce the number of parts.

[0080] <Embodiment 2> Next, a core unit 180 according to a second embodiment of the present disclosure will be described with reference to Figures 8 to 10. The basic structure of the core unit 180 according to the second embodiment is the same as that according to the first embodiment, but in the second embodiment, a first line bypass capacitor 182 and a second line bypass capacitor 184 are held in a single insulating holding case 186. In the following description, the same members and parts as those in the previous embodiment are denoted by the same reference numerals in the drawings, and detailed description thereof will be omitted.

[0081] Similar to the first embodiment, the first line bypass capacitor 182 of the second embodiment includes a pair of first capacitor components 158, 158 and a pair of first terminals 188, 188, and further includes a ground bus bar 190 that connects the first capacitor components 158 to the ground potential. The second line bypass capacitor 184 of the second embodiment includes a pair of second capacitor components 166, 166 and a pair of second terminals 192, 192, and further includes the ground bus bar 190. The first terminals 188, the second terminals 192, and the ground bus bar 190 are formed by, for example, bus bars.

[0082] Each first terminal 188 has a bolt insertion hole 152 at the other end (upper end) as in the first embodiment. Stud bolts 46, 92 protruding outward in the left-right direction from the first and fourth members 36, 82 are inserted into each bolt insertion hole 152, and a nut 154 is fastened, thereby connecting the protruding end (upper end) of each first terminal 188 to the first and fourth members 36, 82. A bent portion 194 is provided at the lower end of each first terminal 188 extending in the up-down direction, and a supported piece 196 is formed extending rearward. That is, each first terminal 188 has the supported piece 196 at one end (one end, the lower end). Each supported piece 196 has a through hole through which one terminal of each first capacitor component 158 ​​is inserted.

[0083] Each second terminal 192 also has a bolt insertion hole 162 at the other end (upper end) as in the first embodiment. Stud bolts 70, 116 protruding outward in the left-right direction from the third and sixth members 40, 86 are inserted into each bolt insertion hole 162, and nuts 74, 120 are fastened to connect the protruding end (upper end) of each second terminal 192 to the second and third members 38, 40 and the fifth and sixth members 84, 86. A bent portion 198 is provided at the lower end of each second terminal 192 extending in the up-down direction, and a supported piece 200 is formed extending forward. That is, each second terminal 192 has the supported piece 200 at one end (one end, the lower end). Each supported piece 200 has a through hole through which one terminal of each second capacitor component 166 is inserted.

[0084] Ground bus bar 190 has a generally rectangular shape in a plan view and extends in the left-right direction. At each of the four corners of ground bus bar 190, a through-hole is formed, through which the other terminal of each of first capacitor components 158 and second capacitor components 166 is inserted. Furthermore, at the middle of ground bus bar 190 in the longitudinal direction (left-right direction), a bolt insertion hole 202 is formed, through which bolt 168 constituting ground line 148 described above is inserted.

[0085] <Holding Case 186> Holding case 186 has a pair of first capacitor component accommodating portions 204, 204 that accommodate each of the pair of first capacitor components 158, 158, and a pair of first terminal accommodating portions 206, 206 that accommodate each of the pair of first terminals 188, 188. Holding case 186 also has a pair of second capacitor component accommodating portions 208, 208 that accommodate each of the pair of second capacitor components 166, 166, and a pair of second terminal accommodating portions 210, 210 that accommodate each of the pair of second terminals 192, 192. Holding case 186 also has a ground bus bar accommodating portion 212 that accommodates ground bus bar 190.

[0086] Specifically, holding case 186 includes a substantially rectangular base plate portion 214 extending in the horizontal direction (a direction perpendicular to the up-down direction), and each of first capacitor component accommodating portions 204 having a substantially box shape and opening upward is provided at both left-right end portions of a front portion of base plate portion 214. Furthermore, each of second capacitor component accommodating portions 208 having a substantially box shape and opening upward is provided at both left-right end portions of a rear portion of base plate portion 214.

[0087] Furthermore, the first terminal accommodating portions 206 are provided in front of the first capacitor component accommodating portions 204 on the base plate portion 214, and the second terminal accommodating portions 210 are provided in rear of the second capacitor component accommodating portions 208 on the base plate portion 214. Each of the first terminal accommodating portions 206 and each of the second terminal accommodating portions 210 is adapted to hold the bent portion 194 and the supported piece 196 of each first terminal 188 and the bent portion 198 and the supported piece 200 of each second terminal 192, respectively, and is open on both sides (on both the left and right sides) of the base plate portion 214. The ground bus bar accommodating portion 212 is generally rectangular and opens downward in the center portion of the base plate portion 214 in the front-rear direction, and the four corners of the ground bus bar accommodating portion 212 partially overlap the first capacitor component accommodating portion 204 and the second capacitor component accommodating portion 208 in a plan view. In the base plate portion 214, a bolt insertion hole 216 is formed at the position where the ground bus bar accommodating portion 212 is formed, passing through in the vertical direction.

[0088] Then, each first terminal 188 is inserted through an opening on the outer side in the left-right direction of each first terminal accommodating portion 206, thereby assembling each first terminal 188 to the base plate portion 214. When each first terminal 188 is accommodated in each first terminal accommodating portion 206, each supported piece 196 of each first terminal 188 is positioned below each first capacitor component accommodating portion 204, and each supported piece 196 is exposed on the bottom surface of each first capacitor component accommodating portion 204. Similarly, each second terminal 192 is inserted through an opening on the outer side in the left-right direction of each second terminal accommodating portion 210, thereby assembling each second terminal 192 to the base plate portion 214. When each second terminal 192 is accommodated in each second terminal accommodating portion 210, each supported piece 200 of each second terminal 192 is positioned below each second capacitor component accommodating portion 208, and each supported piece 200 is exposed on the bottom surface of each second capacitor component accommodating portion 208.

[0089] The ground bus bar 190 is attached to the ground bus bar accommodating portion 212 from below. As described above, the four corners of the ground bus bar accommodating portion 212 partially overlap with the first capacitor component accommodating portion 204 and the second capacitor component accommodating portion 208. Therefore, the four corners of the ground bus bar 190 accommodated in the ground bus bar accommodating portion 212 are located below the first capacitor component accommodating portion 204 and the second capacitor component accommodating portion 208. In other words, four points of the ground bus bar 190 are exposed on the bottom surfaces of the first capacitor component accommodating portion 204 and the second capacitor component accommodating portion 208. Furthermore, as the ground bus bar 190 is attached to the ground bus bar accommodating portion 212, the bolt insertion holes 216 formed in the base plate portion 214 and the bolt insertion holes 202 formed in the ground bus bar 190 are vertically connected to each other.

[0090] Then, each first capacitor component 158 ​​is inserted into each first capacitor component accommodating section 204 from above and accommodated therein. Each terminal portion of each first capacitor component 158 ​​penetrates the bottom of each first capacitor component accommodating section 204, and one terminal portion of each first capacitor component 158 ​​is inserted into a corresponding through-hole provided in each supported piece 196 of each first terminal 188. The other terminal portion of each first capacitor component 158 ​​is inserted into a corresponding through-hole provided in a front portion of the ground bus bar 190. The terminal portion of each first capacitor component 158 ​​inserted into each through-hole is soldered from below, electrically connecting each first capacitor component 158 ​​to each first terminal 188 and the ground bus bar 190. As a result, each first capacitor component 158 ​​accommodated in each first capacitor component accommodating section 204 is connected in series between each first terminal 188 and the ground bus bar 190.

[0091] Similarly, each second capacitor component 166 is inserted into each second capacitor component accommodating section 208 from above and accommodated therein. The terminals of each second capacitor component 166 penetrate the bottom of the corresponding second capacitor component accommodating section 208, and one terminal of each second capacitor component 166 is inserted into a corresponding through-hole provided in the corresponding supported piece 200 of each second terminal 192. The other terminal of each second capacitor component 166 is inserted into a corresponding through-hole provided in the rear portion of the ground bus bar 190. The terminals of each second capacitor component 166 inserted into the corresponding through-holes are soldered from below, electrically connecting each second capacitor component 166 to each second terminal 192 and the ground bus bar 190. As a result, each second capacitor component 166 accommodated in each second capacitor component accommodating section 208 is connected in series between each second terminal 192 and the ground bus bar 190.

[0092] The core unit 180 having the above-described holding case 186 is fixed to the metal housing 170 by fastening the bolts 168 inserted into the bolt insertion holes 202, 216 to the boss portions 172 of the metal housing 170. As a result, the first line bypass capacitor 182 and the second line bypass capacitor 184 branching from the first, third, fourth, and sixth members 36, 40, 82, and 86 are connected to ground (for example, earth), resulting in a circuit configuration similar to that of the first embodiment.

[0093] The core unit 180 of the second embodiment also has the same circuit configuration as the first embodiment, and therefore exhibits the same effects as the first embodiment. In particular, while the first line bypass capacitor 142 and the second line bypass capacitor 144 are mounted on the printed circuit board 146 in the first embodiment, the second embodiment is configured to hold the first line bypass capacitor 182 and the second line bypass capacitor 184 by a holding case 186. This allows the first line bypass capacitor 182 and the second line bypass capacitor 184 to be grounded without employing the printed circuit board 146. Furthermore, the holding case 186 can protect the components and improve the ease of handling of the components.

[0094] <Embodiment 3> Next, a core unit 220 according to a third embodiment of the present disclosure will be described with reference to Figures 11 to 13. The basic structure of the core unit 220 according to the third embodiment is similar to that of the first embodiment, and as shown in the circuit diagram of Figure 13, the first conductor portion 22 forms a + line 222a of the current path 16, and the second conductor portion 26 forms a - line 222b of the current path 16. That is, the first forward connection portion 44 of the first conductor portion 22 is connected to a + terminal portion of the power source 12, and the third rear connection portion 80 is connected to a + terminal portion of the load 14. Furthermore, the fourth forward connection portion 90 of the second conductor portion 26 is connected to a - terminal portion of the power source 12, and the sixth rear connection portion 126 is connected to a - terminal portion of the load 14.

[0095] <Core 224> In the third embodiment, the core 224 is composed of two members, an outer core 226 and an inner core 228. That is, the outer core 226 is an annular member having a through hole 230 extending in the front-rear direction in the center, and the inner core 228 having a substantially rectangular column shape is disposed within the through hole 230.

[0096] Moreover, in the third embodiment, the core case 232 that houses the core 224 can be separated in the front-rear direction, and the core case 232 is composed of a front case 234 and a rear case 236. That is, the front case 234 is generally box-shaped and opens rearward, and the rear case 236 is generally box-shaped and opens forward. The core case 232 that houses the core 224 is formed by assembling the front case 234 and the rear case 236 with the core 224 housed in the front case 234. In particular, in the third embodiment, the front case 234 includes an inner peripheral portion 238 that is disposed radially between the outer core 226 and the inner core 228, and an outer peripheral portion 240 that covers the outer core 226 from the outer peripheral side. A housing cylindrical portion 242 that houses the inner core 228 is formed in the center of the inner peripheral portion 238 and opens rearward. In addition, a left insertion hole 244 and a right insertion hole 246 are formed on both left and right sides of the inner peripheral portion 238, penetrating in the front-to-rear direction, through which spacers 248 (left spacer 250 and right spacer 252) described later are inserted.

[0097] <Spacer 248> In the first embodiment, the first, third, fourth, and sixth members 36, 40, 82, 86 are held by a single spacer 128. However, in the third embodiment, the spacer 248 is composed of two members: a left spacer 250 that holds the first and third members 36, 40 on the left side, and a right spacer 252 that holds the fourth and sixth members 82, 86 on the right side. That is, the left spacer 250 includes the first member accommodating recess 130 and the third member accommodating recess 132, and the right spacer 252 includes the fourth member accommodating recess 136 and the sixth member accommodating recess 138. The left spacer 250 that includes the first and third members 36, 40 is inserted into the left insertion hole 244 of the core case 232, and the right spacer 252 that includes the fourth and sixth members 82, 86 is inserted into the right insertion hole 246 of the core case 232. In other words, the core 224 (outer core 226 and inner core 228) is arranged to cover the outer peripheral sides of the first and third members 36, 40, and the core 224 (outer core 226 and inner core 228) is arranged to cover the outer peripheral sides of the fourth and sixth members 82, 86.

[0098] <First Across-the-Line Capacitor 254 and Second Across-the-Line Capacitor 256> The core unit 220 of the third embodiment also includes a plurality of capacitors 24, which are connected in parallel in the current path 16 extending from the power source 12 to the load 14. Specifically, each capacitor 24 includes a first across-the-line capacitor 254 that connects the + line 222a (first conductor portion 22) and the − line 222b (second conductor portion 26) on the power source 12 side, and a second across-the-line capacitor 256 that connects the + line 222a (first conductor portion 22) and the − line 222b (second conductor portion 26) on the load 14 side. In the third embodiment, the first across-the-line capacitor 254 and the second across-the-line capacitor 256 are each mounted on one printed circuit board 146.

[0099] That is, the first across-the-line capacitor 254 is connected to the first member 36 and the fourth member 82. The first across-the-line capacitor 254 is configured to include first terminals 150 similar to those in the first embodiment, and each first terminal 150 protrudes upward from the printed circuit board 146. The protruding end (upper end) of each first terminal 150 is connected to the stud bolts 46, 92 of the first and fourth members 36, 82 by fastening nuts 154.

[0100] Similarly, the second across-the-line capacitor 256 is connected to the third member 40 and the sixth member 86. The second across-the-line capacitor 256 is configured to include second terminals 160 similar to those in the first embodiment, and each second terminal 160 protrudes upward from the printed circuit board 146. The protruding end (upper end) of each second terminal 160 is connected to the stud bolts 70, 116 of the third and sixth members 40, 86 by fastening nuts 74, 120.

[0101] <Action and effect of core unit 220> In the third embodiment, the first member 36 and the fourth member 82 branch off midway along their paths and are connected to the first across-the-line capacitor 254 (part C1 in FIG. 13). The first member 36 and the fourth member 82, which are inserted into the core 224 (core case 232), are connected to the second member 38 and the fifth member 84, respectively, and run around the outer periphery of the core 224 (core case 232). The mutually opposing portions of the first member 36 and the second member 38, and the fourth member 82 and the fifth member 84 form a coil wound around the core 224 (part L1 in FIG. 13).

[0102] Furthermore, the second member 38 and the fifth member 84 branch off at the second forward connection portion 64 and the fifth forward connection portion 110, respectively, and are connected to the second across-the-line capacitor 256 (part C2 in FIG. 13). The third member 40 and the sixth member 86, which are connected to the second member 38 and the fifth member 84, respectively, extend rearward through the inner periphery of the core 224 (core case 232), and the third rear connection portion 80 and the sixth rear connection portion 126 are each connected to a conductive member on the load 14 side. The mutually opposing portions of the second member 38 and the third member 40, and the fifth member 84 and the sixth member 86, form a coil wound around the core 224 (part L2 in FIG. 13).

[0103] That is, for example, in a signal containing noise input from the + line 222a (first front connection part 44) on the power supply 12 side, noise components mainly composed of high frequencies tend to flow to the first across-the-line capacitor 254 (C1) and are returned to the power supply 12 side via the fourth front connection part 90. Also, in a signal containing noise that flows from the first member 36 to the second member 38, the noise is removed by the core 224 located around the first member 36. Furthermore, in the second member 38, a second across-the-line capacitor 256 (C2) is provided, which branches off and returns the noise components to the power supply 12 side, and in a signal containing noise that flows from the second member 38 to the third member 40, the noise is removed by the core 224 located around the third member 40. That is, even in the third embodiment, a configuration is used in which two CL filters, each composed of a capacitor and an inductor (coil), are connected in series.

[0104] In particular, the first embodiment assumes the occurrence of normal mode noise, and in the circuit shown in Fig. 13, noise currents flow in opposite directions in the first conductor portion 22 and the second conductor portion 26. That is, currents flow in the same direction in the first and third members 36, 40 inserted into the core 224, and therefore magnetic flux B1 is generated around the first and third members 36, 40, as shown in Fig. 12. Meanwhile, in the fourth and sixth members 82, 86 inserted into the core 224, currents flow in the opposite direction to the first and third members 36, 40, and therefore magnetic flux B2 is generated around the sixth members 82, 86, as shown in Fig. 4 and Fig. 12. In this way, in the third embodiment, noise from noise currents flowing in opposite directions can be removed by a single core 224.

[0105] In the core unit 220 of embodiment 3 having the above-described structure, the first to sixth members 36, 38, 40, 82, 84, 86 are formed from bus bars to accommodate large currents, and two CL filters are connected in series to provide a significant noise attenuation effect, so that the same effect as in embodiment 1 can be achieved.

[0106] <Embodiment 4> Next, a core unit 260 according to a fourth embodiment of the present disclosure will be described with reference to Figures 14 to 16. The basic structure of the core unit 260 according to the fourth embodiment is similar to that according to the first embodiment, but in the fourth embodiment, the first conductor 262 includes a seventh member 264 and an eighth member 266 in addition to the first to third members 36, 38, and 40, and the second conductor 268 includes a ninth member 270 and a tenth member 272 in addition to the fourth to sixth members 82, 84, and 86.

[0107] Specifically, the first conductor portion 262 has a seventh member 264 that is connected to the third member 40 on the other axial side (rear side) of the core 20, wraps around the outer periphery of the core 20 and protrudes to one axial side (front side), and an eighth member 266 that is connected to the seventh member 264 on the one axial side (front side) of the core 20, passes through the through hole 18 of the core 20 without contacting the first member 36 and the third member 40, and protrudes to the other axial side (rear side) of the core 20. That is, the seventh member 264 has a seventh front connecting portion 274 and a seventh rear connecting portion 276, and the eighth member 266 has an eighth front connecting portion 278 and an eighth rear connecting portion 280. The seventh rear connecting portion 276 is overlapped with the third rear connecting portion 80 and is bolted to the bolt fastening portion 282. Furthermore, an eighth front connection portion 278 is placed on top of the seventh front connection portion 274 and fastened to the seventh front connection portion 274 by a bolt fastening portion 284 .

[0108] The second conductor portion 268 also has a ninth member 270 that is connected to the sixth member 86 on the other axial side (rear side) of the core 20, wraps around the outer periphery of the core 20 and protrudes to one axial side (front side), and a tenth member 272 that is connected to the ninth member 270 on the one axial side (front side) of the core 20, passes through the through hole 18 of the core 20 without contacting the fourth member 82 and the sixth member 86, and protrudes to the other axial side of the core 20. That is, the ninth member 270 has a ninth front connecting portion 286 and a ninth rear connecting portion 288, and the tenth member 272 has a tenth front connecting portion 290 and a tenth rear connecting portion 292. The ninth rear connecting portion 288 is overlapped with the sixth rear connecting portion 126 and is fastened to them by a bolt fastening portion 294. Furthermore, a tenth front connection portion 290 is placed on top of the ninth front connection portion 286 and fastened to the ninth front connection portion 286 by a bolt fastening portion 296 .

[0109] The other end (upper end) of each of the first terminals 150 constituting the first line bypass capacitor 142 is fixed by fastening nuts 154 to the stud bolts 46, 92 protruding outward in the left-right direction from the first member 36 and the fourth member 82. The other end (upper end) of each of the second terminals 160 constituting the second line bypass capacitor 144 is fixed by a bolt fastening portion 284 that bolts together the seventh member 264 and the eighth member 266, and a bolt fastening portion 296 that bolts together the ninth member 2770 and the tenth member 272.

[0110] This allows a coil portion (L1') to be added compared to embodiment 1, as shown in the circuit diagram of Figure 16, i.e., the number of turns of the coil can be increased, resulting in a larger impedance.

[0111] <Modification> Although Embodiments 1 to 4 have been described above as specific examples of the present disclosure, the present disclosure is not limited to these specific descriptions. Modifications, improvements, etc., within the scope of achieving the object of the present disclosure, are included in the present disclosure. For example, the following modifications of the embodiments are also included in the technical scope of the present disclosure.

[0112] (1) In the above-described embodiment, both the first conductor portion 22, 262 and the second conductor portion 26, 268 are wound around the core 20, 224. However, in the third embodiment, which assumes normal mode noise, only the first conductor portion may be wound around the core.

[0113] (2) In the first embodiment, the first line bypass capacitor 142 and the second line bypass capacitor 144 (i.e., each first capacitor component 158 ​​and each second capacitor component 166) are mounted on the same printed circuit board 146 and connected to ground from the same ground line 148 (voltage 168), but this is not limiting. The first line bypass capacitor (first capacitor component) and the second line bypass capacitor (second capacitor component) may be mounted on separate printed circuit boards or connected to ground from separate ground lines. This also applies to the second and fourth embodiments.

[0114] (3) In the first embodiment, the second terminals 160 constituting the second line bypass capacitor 144 are overlapped with the second front connection portion 64 of the second member 38 and the fifth front connection portion 110 of the fifth member 84 from the outside (outside in the left-right direction) and bolted together. However, this is not limited to this. For example, each second terminal may be bolted together while sandwiched between the second front connection portion and the third front connection portion, or between the fifth front connection portion and the sixth front connection portion. That is, the second line bypass capacitor may be connected to the second or third member, the fifth or sixth member, and the ground line. Specifically, the protruding end of the second terminal constituting the second line bypass capacitor may be connected to the second or third member and the fifth or sixth member. The same applies to the second embodiment.

[0115] Furthermore, in the third embodiment, the second across-the-line capacitor may be connected to the second or third member and the fifth or sixth member. Specifically, the protruding end of the second terminal constituting the second across-the-line capacitor may be connected to the second or third member and the fifth or sixth member. Similarly, in the fourth embodiment, the second line bypass capacitor may be connected to the seventh or eighth member and the ninth or tenth member.

[0116] (4) In the fourth embodiment, the first line bypass capacitor 142 is connected to the first member 36 and the fourth member 82, and the second line bypass capacitor 144 is connected to the seventh member 264 (or the eighth member 266) and the ninth member 270 (or the tenth member 272), but this is not limiting. In the fourth embodiment, the first line bypass capacitor may be connected to the second member (or the third member) and the fifth member (or the sixth member), or three line bypass capacitors may be provided. [Explanation of symbols]

[0117] 10 Core unit (embodiment 1) 12 Power supply 14 Load 16 Current-carrying path 17a + line 17b - Line 18 Through holes 20 cores 22 First conductor 24 capacitors 26 Second conductor section 28 Core Case 30 outer part 32 Inner part 34 Insertion hole 36 First member 38 Second member 40 Third member 42 Through hole 44 First forward connection 46,48 Stud bolt 50 First rear connection 52 Through hole 54 Second rear connection 56 Nut 58 Bolt fastening part 60 Vertical wall section 62 Through hole 64 Second forward connection 66 Vertical wall section 68 Slanted wall section 70 stud bolt 72 Third forward connection 74 Nut 76 Bolt fastening part 78 Through Hole 80 Third rear connection 82 Fourth member 84 Fifth member 86 6th member 88 Through Hole 90 4th forward connection 92,94 Stud bolt 96 4th rear connection 98 Through Hole 100 5th rear connection 102 Nut 104 Bolt fastening part 106 Vertical wall section 108 Through Hole 110 5th forward connection 112 Vertical wall section 114 Slanted wall section 116 Stud bolt 118 6th forward connection 120 Nut 122 Bolt fastening part 124 Through Hole 126 6th Rear Connection 128 Spacer 130 First member accommodating recess 132 third member accommodating recess 133 Bottom 134 Left wall 136 Fourth member accommodating recess 138 Sixth member receiving recess 140 Right wall 142 First line bypass capacitor 144 Second line bypass capacitor 146 Printed Circuit Board 148 Grand Line 150 1st terminal 152 Bolt insertion hole 154 Nut 156 volts 158 First capacitor part 160 2nd terminal 162 Bolt insertion hole 164 volts 166 Second capacitor part 168 volts 170 Metal Case 172 Boss Section 180 Core unit (embodiment 2) 182 First line bypass capacitor 184 Second line bypass capacitor 186 Holding Case 188 1st terminal 190 Ground bus bar 192 2nd terminal 194 Bend 196 Supported piece 198 Bend 200 Supported piece 202 Bolt insertion hole 204 First capacitor component housing 206 First terminal housing 208 Second capacitor component housing 210 Second terminal housing 212 Ground bus bar housing 214 Base plate 216 Bolt insertion hole 220 Core unit (embodiment 3) 222a + line 222b - Line 224 cores 226 outer core 228 Inner Core 230 Through hole 232 Core Case 234 Front case 236 Rear case 238 Inner circumference side part 240 Outer part 242 Storage tube 244 Left side insertion hole 246 Right side insertion hole 248 Spacer 250 left spacer 252 Right spacer 254 1st across-the-line capacitor 256 Second Across-the-Line Capacitor 260 Core unit (embodiment 4) 262 First conductor 264 7th Component 266 8th Component 268 Second Conductor 270 9th Component 272 10th Component 274 7th Forward Connection 276 7th Rear Connection 278 8th Forward Connection 280 8th Rear Connection 282,284 Bolted joints 286 9th Forward Junction 288 9th Rear Connection 290 10th Forward Connection 292 10th Rear Connection 294,296 Bolted joints B, B1, B2 magnetic flux

Claims

1. a core having a through hole; a current path including a first conductor portion made of a strip-shaped metal flat plate wound around the core; at least one capacitor connected to the first conductor portion; the first conductor portion has a first member that penetrates the through hole of the core and protrudes from one axial side of the core to the other axial side, a second member that is connected to the first member on the other axial side of the core and protrudes around the outer periphery of the core to the one axial side, and a third member that is connected to the second member on the one axial side of the core and penetrates the through hole of the core without contacting the first member and protrudes to the other axial side of the core, The core unit, wherein the at least one capacitor is connected in parallel to ground or between the + line and − line of the current path.

2. the current-carrying path includes a second conductor portion made of a strip-shaped metal flat plate wound around the core, the first conductor portion constitutes the positive line of the current path, the second conductor portion constitutes the negative line of the current path, 2. The core unit of claim 1, wherein the second conductor portion has: a fourth member that penetrates the through hole of the core and protrudes from one axial side of the core to the other axial side; a fifth member that is connected to the fourth member on the other axial side of the core and protrudes around the outer periphery of the core to the one axial side; and a sixth member that is connected to the fifth member on the one axial side of the core and penetrates the through hole of the core without contacting the fourth member and protrudes to the other axial side of the core.

3. further comprising an insulating spacer extending through the through hole; The core unit according to claim 2 , wherein the spacer is disposed between the first conductor portion and the second conductor portion.

4. the at least one capacitor comprises a plurality of capacitors; The core unit according to claim 1 , wherein all of the plurality of capacitors are arranged on one side of the core in the axial direction.

5. the plurality of capacitors includes a first line bypass capacitor and a second line bypass capacitor; the first line bypass capacitor is connected to the first member, the fourth member, and a ground line; The core unit according to claim 4 when claim 2 is recited, wherein the second line bypass capacitor is connected to the second member or the third member, the fifth member or the sixth member, and the ground line.

6. the first line bypass capacitor and the second line bypass capacitor are mounted on a single printed circuit board; a pair of first terminals constituting the first line bypass capacitor and a pair of second terminals constituting the second line bypass capacitor are provided to protrude from the printed circuit board; protruding ends of the pair of first terminals are connected to the first member and the fourth member, respectively; The core unit according to claim 5 , wherein protruding ends of the pair of second terminals are connected to the second member or the third member and the fifth member or the sixth member, respectively.

7. a connection portion between the second member and the third member and a connection portion between the fifth member and the sixth member each include a bolt fastening portion, The core unit according to claim 6 , wherein the protruding end portions of the pair of second terminals are fastened to the respective connecting portions by bolts at the bolt fastening portions.

8. the first line bypass capacitor and the second line bypass capacitor are held in a single insulating holding case, the first line bypass capacitor includes a pair of first capacitor components, a pair of first terminals, and a ground bus bar; the second line bypass capacitor includes a pair of second capacitor components, a pair of second terminals, and the ground bus bar; the holding case has a pair of first capacitor component accommodating portions, a pair of first terminal accommodating portions, a pair of second capacitor component accommodating portions, a pair of second terminal accommodating portions, and a ground bus bar accommodating portion; one end of each of the first terminals accommodated in each of the first terminal accommodating portions is exposed on a bottom surface of each of the first capacitor component accommodating portions, one end of each of the second terminals accommodated in each of the second terminal accommodating portions is exposed on a bottom surface of each of the second capacitor component accommodating portions, four locations of the ground bus bar accommodated in the ground bus bar accommodation portion are exposed on the bottom surfaces of the pair of first capacitor component accommodation portions and the pair of second capacitor component accommodation portions, respectively; the first capacitor components accommodated in the first capacitor component accommodating portions are connected in series between the first terminals and the ground bus bar, the second capacitor components accommodated in the second capacitor component accommodating portions are connected in series between the second terminals and the ground bus bar, protruding ends of the pair of first terminals are connected to the first member and the fourth member, respectively; The core unit according to claim 5 , wherein protruding ends of the pair of second terminals are connected to the second member or the third member and the fifth member or the sixth member, respectively.

9. a connection portion between the second member and the third member and a connection portion between the fifth member and the sixth member each include a bolt fastening portion, The core unit according to claim 8 , wherein the protruding end portions of the pair of second terminals are fastened to the respective connecting portions by bolts at the bolt fastening portions.

10. the plurality of capacitors includes a first across-the-line capacitor and a second across-the-line capacitor; the first across-the-line capacitor is connected to the first member and the fourth member; The core unit according to claim 4 when claim 2 is relied upon, wherein the second across-the-line capacitor is connected to the second member or the third member and the fifth member or the sixth member.

11. the first across-the-line capacitor and the second across-the-line capacitor are mounted on a single printed circuit board; a pair of first terminals constituting the first across-the-line capacitor and a pair of second terminals constituting the second across-the-line capacitor are provided to protrude from the printed circuit board, protruding ends of the pair of first terminals are connected to the first member and the fourth member, respectively; The core unit according to claim 10 , wherein protruding ends of the pair of second terminals are connected to the second member or the third member and the fifth member or the sixth member, respectively.

12. the first conductor portion further includes a seventh member connected to the third member on the other axial side of the core, going around the outer periphery of the core and protruding to the one axial side of the core, and an eighth member connected to the seventh member on the one axial side of the core, passing through the through hole of the core without contacting the first member and the third member, and protruding to the other axial side of the core, the second conductor portion further includes a ninth member connected to the sixth member on the other axial side of the core, going around the outer periphery of the core and protruding to the one axial side of the core, and a tenth member connected to the ninth member on the one axial side of the core, passing through the through hole of the core without contacting the fourth member and the sixth member, and protruding to the other axial side of the core, A core unit as described in claim 4 when citing claim 2, wherein on one axial side of the core, the capacitor is connected to the first member of the first conductor portion, the seventh member or the eighth member, respectively, and the capacitor is connected to the fourth member of the second conductor portion, the ninth member or the tenth member, respectively.

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