Noise reduction device

Abstract

This suppresses changes in the magnetic properties of the magnetic core caused by heat generation. [Solution] The noise reduction device comprises a first busbar, a second busbar, and an annular magnetic core surrounding at least one of the first busbar and the second busbar, wherein the first busbar includes a first conductive portion through which current flows and a male terminal provided at the end of the first conductive portion, and the second busbar includes a second conductive portion through which current flows and a female terminal provided at the end of the second conductive portion and connected to the male terminal, wherein the male terminal is inseparable from the first conductive portion and the female terminal is inseparable from the second conductive portion.

Description

Technical Field

[0001] The present disclosure relates to a noise reduction device.

Background Art

[0002] Vehicles that generate driving force by electricity, such as electric vehicles, hybrid vehicles, and plug-in hybrid vehicles, are equipped with a power conversion device that converts DC power supplied from a storage battery into AC power. The storage battery, which is a DC power source, and the power conversion device are connected by a bus bar capable of transmitting large power.

[0003] Patent Document 1 discloses a noise filter that holds connection terminals inside a non-divided magnetic core and connects bus bars to both ends of the connection terminals, thereby increasing the degree of freedom in the shape of the bus bar within the device.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The noise filter disclosed in Patent Document 1 connects two bus bars by inserting a bus bar between two plate spring-like elastic pieces arranged opposite to each other at both ends of a connection terminal. In a vehicle where vibration is likely to occur, the connection portion between the connection terminal and the bus bar may wear due to vibration, and the contact resistance may increase, resulting in heat generation. Inside the magnetic core, when the contact resistance at each of the two connection portions at both ends of the connection terminal increases, the amount of heat generation increases, and the magnetic characteristics of the magnetic core change due to heat, resulting in a decrease in the noise reduction effect.

Means for Solving the Problems

[0006] A noise reduction device according to one aspect of the present disclosure comprises a first busbar, a second busbar, and an annular magnetic core surrounding at least one of the first busbar and the second busbar, wherein the first busbar includes a first conductive portion through which current flows and a male terminal provided at the end of the first conductive portion, and the second busbar includes a second conductive portion through which current flows and a female terminal provided at the end of the second conductive portion and connected to the male terminal, wherein the male terminal is inseparable from the first conductive portion and the female terminal is inseparable from the second conductive portion. [Effects of the Invention]

[0007] According to this disclosure, it is possible to suppress changes in the magnetic properties of the magnetic core due to heat generation. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a block diagram showing an example of the configuration of an in-vehicle system according to an embodiment. [Figure 2] Figure 2 is a perspective view showing an example of the configuration of a noise reduction device according to this embodiment. [Figure 3] Figure 3 is a cross-sectional view showing an example of the configuration of a noise reduction device according to the embodiment, and shows the connection state between the male terminal and the female terminal. [Figure 4] Figure 4 is a perspective view showing an example of the configuration of a noise reduction device according to the embodiment, and shows the unconnected state of the male terminal and female terminal. [Figure 5] Figure 5 is a perspective view showing an example of the configuration of the male and female terminals according to the embodiment. [Figure 6] Figure 6 is a perspective view showing a first modified example of the configuration of the male and female terminals according to the embodiment. [Figure 7] Figure 7 is a perspective view showing a second modified example of the configuration of the male and female terminals according to the embodiment. [Figure 8] Figure 8 is a perspective view showing a third modified example of the configuration of the male and female terminals according to the embodiment. [Figure 9]Figure 9 is a cross-sectional view showing a first modified example of the housing configuration in the noise reduction device according to the embodiment. [Figure 10] Figure 10 is a cross-sectional view showing a second modified example of the housing configuration in the noise reduction device according to the embodiment. [Figure 11] Figure 11 is a cross-sectional view showing a third modified example of the housing configuration in the noise reduction device according to the embodiment. [Figure 12] Figure 12 is a cross-sectional view showing a fourth modified example of the housing configuration in the noise reduction device according to the embodiment. [Modes for carrying out the invention]

[0009] <Summary of the embodiments of this disclosure> The embodiments of this disclosure are outlined below.

[0010] (1) The noise reduction device according to this embodiment comprises a first busbar, a second busbar, and an annular magnetic core surrounding at least one of the first busbar and the second busbar, wherein the first busbar includes a first conductive portion through which current flows and a male terminal provided at the end of the first conductive portion, and the second busbar includes a second conductive portion through which current flows and a female terminal provided at the end of the second conductive portion and connected to the male terminal, wherein the male terminal is inseparable from the first conductive portion and the female terminal is inseparable from the second conductive portion. As a result, there is only one connection point between the first busbar and the second busbar, so there is only one point of heat generation due to increased contact resistance caused by vibration, and the amount of heat generated is reduced. Therefore, it is possible to suppress changes in the magnetic properties of the magnetic core due to heat generation.

[0011] (2) In (1) above, the female terminal may be fixed to the second conductive part. This prevents an increase in contact resistance caused by vibration at the connection point between the female terminal and the second conductive part.

[0012] (3) In the above (1) or (2), the male terminal may be the end portion of the first conductive portion. Thereby, there is no connection portion between the male terminal and the first conductive portion, and an increase in contact resistance due to vibration in the first bus bar can be prevented.

[0013] (4) In any one of (1) to (3) above, at least a part of the connection portion of the male terminal and the female terminal may be disposed inside the magnetic core. Thereby, the size of the noise reduction device can be reduced.

[0014] (5) In any one of (1) to (3) above, the connection portion of the male terminal and the female terminal may be disposed outside the magnetic core. Thereby, even if the contact resistance at the connection portion between the male terminal and the female terminal increases, heat generation inside the magnetic core can be suppressed.

[0015] (6) In the above (5), the female terminal is fixed to the end portion of the second conductive portion, and the fixing portion between the female terminal and the second conductive portion may be disposed inside the magnetic core. Thereby, even if the connection portion between the male terminal and the female terminal is disposed outside the magnetic core, an increase in the size of the noise reduction device can be suppressed.

[0016] (7) In the above (5), the female terminal is fixed to the end portion of the second conductive portion, and the fixing portion between the female terminal and the second conductive portion may be disposed outside the magnetic core. Thereby, heat generation inside the magnetic core can be further suppressed.

[0017] (8) In any one of (1) to (7) above, the noise reduction device further comprises a housing for housing the magnetic core, the housing including a first member for holding the magnetic core and a second member connectable to the first member, wherein the first conductive portion may penetrate the first member and the second conductive portion may penetrate the second member. This allows the male terminal and the female terminal to be connected by connecting the first member and the second member.

[0018] (9) In (8) above, the noise reduction device further comprises a third busbar aligned with the first busbar in a direction intersecting the central axis direction of the magnetic core, and a fourth busbar aligned with the second busbar in the intersecting direction, wherein the end of the third busbar and the end of the fourth busbar are connected to each other, the third busbar may penetrate the first member at a position spaced apart from the position where the first conductive portion penetrates the first member, and the fourth busbar may penetrate the second member at a position spaced apart from the position where the second conductive portion penetrates the second member. This makes it possible to secure creepage distance between the first busbar and the third busbar, and to secure creepage distance between the second busbar and the fourth busbar.

[0019] (10) In any one of (1) to (7) above, the noise reduction device further comprises a housing for housing the magnetic core, the housing including a first member for holding the magnetic core and a second member connectable to the first member, wherein the first conductive portion may penetrate the second member, and the second conductive portion may penetrate the first member. This allows the male terminal and the female terminal to be connected by connecting the first member and the second member.

[0020] (11) In (8) above, the noise reduction device further comprises a third busbar aligned with the first busbar in a direction intersecting the central axis direction of the magnetic core, and a fourth busbar aligned with the second busbar in the intersecting direction, wherein the end of the third busbar and the end of the fourth busbar are connected to each other, the third busbar penetrates the second member at a position spaced apart from the position where the first conductive portion penetrates the second member, and the fourth busbar penetrates the first member at a position spaced apart from the position where the second conductive portion penetrates the first member. This ensures a creepage distance between the first busbar and the third busbar, and a creepage distance between the second busbar and the fourth busbar.

[0021] This disclosure can be implemented not only as a noise reduction device having the characteristic configuration described above, but also as a power conversion device including the noise reduction device, or as a noise reduction method including characteristic steps.

[0022] <Details of the embodiments of this disclosure> The embodiments of the present invention will be described in detail below with reference to the drawings. At least some of the embodiments described below may be combined in any way.

[0023] [1. In-vehicle systems] Figure 1 is a block diagram showing an example of the configuration of an in-vehicle system according to an embodiment. The in-vehicle system 1 is mounted on a vehicle.

[0024] The in-vehicle system 1 relating to this implementation includes a battery 40, a power converter 20, and an ECU (Electronic Control Unit) 50.

[0025] Battery 40 is an auxiliary battery that supplies power to multiple ECUs 50, which are on-board devices. Power lines extend from battery 40 and are connected to the power converter 20.

[0026] The power conversion device 20 includes a DC / DC converter 30 and a noise reduction device 10. The DC / DC converter 30 converts the DC voltage output from the battery 40 into a DC voltage for output to the ECU 50. For example, the DC / DC converter 30 is a bidirectional voltage converter. That is, the DC / DC converter 30 is connected to a generator (not shown), and can also convert the DC voltage output from the generator into a DC voltage for output to the battery 40. As a result, the battery 40 is charged by the generator.

[0027] A noise reduction device 10 is connected to the output side of the DC / DC converter 30. The noise reduction device 10 reduces the noise contained in the output current from the DC / DC converter 30. The noise reduction device 10 includes a busbar 200, which is a power transmission line. The input terminal of the busbar 200 is connected to the DC / DC converter 30, and the output terminal of the busbar 200 is connected to power lines that connect to multiple ECUs.

[0028] Multiple ECUs 50 are positioned in various parts of the vehicle. Each ECU 50 individually controls the hardware of each part of the vehicle and monitors the status of the hardware in each part. For example, the ECUs 50 could be for the control system, body system, or information system. Each ECU 50 is connected to the others via an in-vehicle network, enabling communication between them.

[0029] [2. Noise Reduction Device] Figure 2 is a perspective view showing an example of the configuration of a noise reduction device according to the embodiment, and Figures 3 and 4 are cross-sectional views thereof.

[0030] The noise reduction device 10 includes a first busbar 210A, a second busbar 220A, a third busbar 210B, a fourth busbar 220B, and a housing 300 for housing a magnetic core.

[0031] The first busbar 210A and the second busbar 220A are connected to each other, and current flows from the first busbar 210A to the second busbar 220A. The third busbar 210B and the fourth busbar 220B are connected to each other, and current flows from the fourth busbar 220B to the third busbar 210B. The first busbar 210A and the third busbar 210B are arranged in parallel with each other, and the second busbar 220A and the fourth busbar 220B are arranged in parallel with each other. In other words, the direction in which current flows from the first busbar 210A to the second busbar 220A is opposite to the direction in which current flows from the fourth busbar 220B to the third busbar 210B.

[0032] Hereinafter, the direction in which current flows from the first busbar 210A to the second busbar 220A will be referred to as "rearward," and the direction in which current flows from the fourth busbar 220B to the third busbar 210B will be referred to as "forward." It is assumed that the first busbar 210A and the second busbar 220A are arranged horizontally, and the third busbar 210B and the fourth busbar 220B are also arranged horizontally. The horizontal direction perpendicular to the front-rear direction will be referred to as the "left-right direction." Here, "right" refers to the right when facing backward, and "left" refers to the left when facing backward. The direction perpendicular to the front-rear and left-right directions will be referred to as the "up-down direction." However, these directions are merely for convenience based on the illustrated state and do not limit the directions. Figures 3 and 4 show plan cross-sectional views when the noise reduction device 10 is cut by a plane perpendicular to the up-down direction.

[0033] The first busbar 210A, the second busbar 220A, the third busbar 210B, and the fourth busbar 220B are each made of a plate-shaped conductor such as copper, aluminum, or brass, and are capable of carrying large currents.

[0034] The configuration of the first busbar 210A and the third busbar 210B are identical, and the configuration of the second busbar 220A and the fourth busbar 220B are identical. The configurations of the first busbar 210A and the second busbar 220A will be described below, and the descriptions of the configurations of the third busbar 210B and the fourth busbar 220B will be omitted.

[0035] The first busbar 210A includes a male terminal 211A at one end, and the second busbar 220A includes a female terminal 221A at one end. The male terminal 211A is connectable to the female terminal 221A. Figure 3 shows the connected state of the male terminal 211A and the female terminal 221A, and Figure 4 shows the disconnected state of the male terminal 211A and the female terminal 221A.

[0036] The housing 300 includes a first member 310 and a second member 320. The second member 320 permanently holds the first busbar 210A and the third busbar 210B, respectively. More specifically, the second member 320 includes a cylindrical main body 321, in which the first busbar 210A and the third busbar 210B are held. When the central axis of the main body 321 is aligned in the front-rear direction, the first busbar 210A penetrates the main body 321 at a predetermined distance to the right of the central axis, and the third busbar 210B penetrates the main body 321 at a predetermined distance to the left of the central axis. Since the first busbar 210A and the third busbar 210B are fixed to the main body 321 at a distance from each other, a creepage distance can be secured between the first busbar 210A and the third busbar 210B.

[0037] The first busbar 210A and the third busbar 210B each protrude a predetermined length from the rear end surface of the main body 321. The portions of the first busbar 210A and the third busbar 210B that protrude from the rear end surface of the main body 321 include the male terminals 211A and 211B. That is, the entirety of the male terminals 211A and 211B protrudes rearward from the rear end surface of the main body 321.

[0038] The first member 310 houses the magnetic core 100 and holds the second busbar 220A and the fourth busbar 220B in a fixed manner. More specifically, the first member 310 includes a cylindrical main body 311, in which the magnetic core 100, the second busbar 220A, and the fourth busbar 220B are held. When the central axis of the main body 311 is aligned in the front-rear direction, the female terminal 221A of the second busbar 220A is positioned within the main body 311 at a predetermined distance to the right of the central axis, and the female terminal 221B of the fourth busbar 220B is positioned within the main body 311 at a predetermined distance to the left of the central axis. The second conductive parts 222A and 222B each penetrate the main body 311 while being separated from each other by a distance necessary for electrical insulation. Since the second busbar 220A and the fourth busbar 220B are fixed to the main body 311 at a distance from each other, a creepage distance can be secured between the second busbar 220A and the fourth busbar 220B.

[0039] The front end surface of the main body 311 has exposed tips for the female terminals 221A and 221B, and recesses for the female terminals 221A and 221B (recesses for inserting the male terminals) are open on the front end surface of the main body 311.

[0040] As shown in Figure 4, the male terminals 211A, 211B and the female terminals 221A, 221B are separated from each other, and the second member 320 is positioned in front of the first member 310. By moving the second member 320 backward, the male terminals 211A, 211B are inserted into the female terminals 221A, 221B, transitioning to the connection state shown in Figure 3.

[0041] Guide grooves 312 are provided on both the left and right sides of the main body portion 311 of the first member 310 to guide the connection of the second member 320. The guide grooves 312 extend from the front end of the main body portion 311 to an intermediate position in the front-rear direction. The guide grooves 312 are formed to be recessed one step lower (i.e., inward) than the outer edge of the main body portion 311. A deeper recess 313 is provided at the rear end of the guide groove 312.

[0042] The second member 320 has sliding parts 321 that protrude rearward from both the left and right sides of the rear end of the main body 321. The sliding parts 321 are positioned to correspond to the guide grooves 312 of the first member 310. The tip (rear end) of the sliding part 321 is provided with a hook 323 that protrudes inward.

[0043] When connecting male terminals 211A, 211B and female terminals 221A, 221B from a disconnected state, the operator moves the second member 320 backward, bringing it close to the first member 310. The sliding part 321 is fitted into the guide groove 312, and as the sliding part 321 slides along the guide groove 312, the second member 320 is connected to the first member 310 without twisting relative to the first member 310. At this time, the male terminals 211A, 211B are inserted into the female terminals 221A, 221B, and the male terminals 211A, 211B and the female terminals 221A, 221B are connected. In this way, by attaching the second member 320 to the first member 310, the male terminals 211A, 211B and the female terminals 221A, 221B can be connected.

[0044] The positions of the male terminals 211A and 211B on the second member 320 are fixed, and the positions of the female terminals 221A and 221B on the first member 310 are fixed. Therefore, by attaching the second member 320 to the first member 310, the tips of the male terminals 211A and 211B can be guided to the female terminals 221A and 221B. This prevents the tips of the male terminals 211A and 211B from contacting (butting) the surrounding areas of the female terminals 221A and 221B on the front end surface of the first member 310, thereby preventing damage to the male terminals 211A and 211B or the first member 310.

[0045] [3. Bass Bar Configuration] Figure 5 is a perspective view showing an example of the configuration of the male and female terminals according to the embodiment.

[0046] The first busbar 210A includes a first conductive portion 212A through which current flows, and a male terminal 211A provided at the end of the first conductive portion 212A. The male terminal 211A is fixedly attached to the first conductive portion 212A. That is, the male terminal 211A cannot be detached from the first conductive portion 212A.

[0047] In the example shown in Figure 5, the first busbar 210A is made of a single conductive metal plate. The male terminal 211A is integrally formed with the first conductive portion 212A. In other words, the male terminal 211A is formed continuously from the first conductive portion 212A, and the end of the plate-shaped first busbar 210A is the male terminal 211A. Of the first busbar 210A, the portion that is inserted into the female terminal 221A is the male terminal 211A, and the portion of the first busbar 210A other than the male terminal 211A (at least a part of it) is the first conductive portion 212A. The dashed line in Figure 5 is the boundary between the male terminal 211A and the first conductive portion 212A.

[0048] The second busbar 220A includes a second conductive portion 222A through which current flows, and a female terminal 221A provided at the end of the second conductive portion 222A. The female terminal 221A is fixedly attached to the second conductive portion 222A. That is, the female terminal 221A cannot be detached from the second conductive portion 222A.

[0049] In the example shown in Figure 5, the female terminal 221A is constructed by bending one or more metal plates. In the female terminal 221A, two metal plates are arranged opposite each other, and the male terminal 211A is sandwiched between these two metal plates, thereby connecting the male terminal 211A and the female terminal 221A.

[0050] The rear end of the female terminal 221A is a fixing portion 223A fixed to the front end of the second conductive portion 222A. In the first example, the female terminal 221A is fixed to the second conductive portion 222A by welding. In the second example, the female terminal 221A may be fixed to the second conductive portion 222A by crimping. Crimping is a method of fixing two parts together by plastically deforming a part of a metal part. In the third example, the female terminal 221A may be fixed to the second conductive portion 222A by bolts. In the fourth example, the female terminal 221A may be fixed to the second conductive portion 222A by conductive adhesive or solder.

[0051] The configurations of the male terminal 211A and the female terminal 221A are not limited to those described above. The following describes some variations of the male and female terminals.

[0052] Figure 6 is a perspective view showing a first modified example of the configuration of the male and female terminals according to the embodiment.

[0053] In the first modified example shown in Figure 6, the male terminal 211_1 is cylindrical and the female terminal 221_1 is cylindrical. The outer diameter of the male terminal 211_1 and the inner diameter of the female terminal 221_1 correspond to each other, and the male terminal 211_1 can be inserted into the female terminal 221_1.

[0054] In the first busbar 210_1, the male terminal 211_1 is fixed to the first conductive part 212_1 at the fixing part 213_1. The method of fixing the male terminal 211_1 to the first conductive part 212_1 is selected from welding, crimping, bolting, and conductive adhesive (or solder).

[0055] In the second busbar 220_1, the female terminal 221_1 is fixed to the second conductive part 222_1 at the fixing part 223_1. The method of fixing the female terminal 221_1 to the second conductive part 222_1 is selected from welding, crimping, bolting, and conductive adhesive (or solder).

[0056] Figure 7 is a perspective view showing a second modified example of the configuration of the male and female terminals according to the embodiment.

[0057] In the second modified example shown in Figure 7, the male terminal 211_2 is prismatic in shape, and the female terminal 221_2 is cylindrical in shape. The shape and size of the male terminal 211_2 correspond to the shape and size of the recess of the female terminal 221_2, and the male terminal 211_2 can be inserted into the female terminal 221_2.

[0058] In the first busbar 210_2, the male terminal 211_2 is fixed to the first conductive part 212_2 at the fixing part 213_2. The method of fixing the male terminal 211_2 to the first conductive part 212_2 is selected from welding, crimping, bolting, and conductive adhesive (or solder).

[0059] In the second busbar 220_2, the female terminal 221_2 is fixed to the second conductive part 222_2 at the fixing part 223_2. The method of fixing the female terminal 221_2 to the second conductive part 222_2 is selected from welding, crimping, bolting, and conductive adhesive (or solder).

[0060] Figure 8 is a perspective view showing a third modified example of the configuration of the male and female terminals according to the embodiment.

[0061] In the third modified example shown in Figure 8, the male terminal 211_3 is the end of the first conductive part 212_3 and is the same as the male terminal 211_1 in the embodiment described above. The female terminal 221_3 is a leaf spring fixed to one surface of the second conductive part 222_3. The rear end (fixing part 223_3) of the female terminal 221_3 is fixed to one surface (left side) of the front end portion of the second conductive part 222_3, and the front end is a free end that is not fixed. In the female terminal 221_3, which is a leaf spring, the front end is biased in a direction to contact the left side surface of the second conductive part 222_3. By moving the first busbar 210_1 backward, the male terminal 211_3 is sandwiched between the female terminal 221_3 and the left side surface of the second conductive part 222_3, and the male terminal 211_3 and the female terminal 221_3 are connected.

[0062] In the second busbar 220_3, the female terminal 221_3 is fixed to the second conductive part 222_3 at the fixing part 223_3. The method of fixing the female terminal 221_3 to the second conductive part 222_3 is selected from welding, crimping, bolting, and conductive adhesive (or solder).

[0063] [4. Positional relationship between the connection points of the male and female terminals and the magnetic core] Returning to Figure 3, inside the main body 311, the annular magnetic core 100 surrounds the second and fourth busbars. Specifically, at least a portion of the connection points between the male terminals 211A, 211B and the female terminals 221A, 221B are located inside the magnetic core 100. More specifically, the fixing portions 223A, 223B between the female terminals 221A, 221B and the second conductive parts 222A, 222B are located inside the magnetic core 100.

[0064] In the noise reduction device according to this embodiment, the configuration of the housing that defines the positions of the male and female terminals can be modified in various ways. The following describes some variations of the housing configuration.

[0065] Figure 9 is a cross-sectional view showing a first modified example of the housing configuration in the noise reduction device according to the embodiment.

[0066] In the first modified example shown in Figure 9, the first busbar 210A and the third busbar 210B are held by the first member 310_1 which holds the magnetic core 100, and the second busbar 220A and the fourth busbar 220B are held by the second member 320_1.

[0067] A projection 324_1 is provided at the center of the rear end surface of the main body portion 321_1 of the second member 320_1, projecting backward. Female terminals 221A and 221B are held in the projection 324_1. The fixing portions 223A and 223B are also located within the projection 324_1.

[0068] A recessed area 314_1 is provided in the center of the front end surface of the main body portion 311_1 of the first member 310_1. The shape and size of the recessed area 314_1 correspond to the shape and size of the protrusion 324_1, and the protrusion 324_1 can be inserted into the recessed area 314_1.

[0069] A magnetic core 100 is positioned around the recess 314_1 of the first member 310_1. Therefore, when the first member 310_1 and the second member 320_1 are connected, the protrusion 324_1 is inserted into the recess 314_1, and the entire connection points of the male terminals 211A, 211B and female terminals 221A, 221B, as well as the fixing parts 223A, 223B, are positioned inside the magnetic core 100. This makes it possible to miniaturize the housing 300_1 and reduce the noise reduction device 10_1.

[0070] Figure 10 is a cross-sectional view showing a second modified example of the housing configuration in the noise reduction device according to the embodiment.

[0071] In the second modified example shown in Figure 10, the first busbar 210A and the third busbar 210B are held by the first member 310_2 which holds the magnetic core 100 in the housing 300_2, and the second busbar 220A and the fourth busbar 220B are held by the second member 320_2.

[0072] A projection 324_2 is provided at the center of the rear end surface of the main body portion 321_2 of the second member 320_2, projecting backward. The length of the projection 324_2 is shorter than the length of the female terminals 221A and 221B. In other words, the tip to partway along the female terminals 221A and 221B are located inside the projection 324_2, while the remaining parts of the female terminals 221A and 221B are located inside the main body portion 321_2, forward of the projection 324_2. The fastening portions 223A and 223B are also located inside the main body portion 321_2, forward of the projection 324_2.

[0073] A recessed area 314_2 is provided in the center of the front end surface of the main body portion 311_2 of the first member 310_2. The shape and size of the recessed area 314_2 correspond to the shape and size of the protrusion 324_2, and the protrusion 324_2 can be inserted into the recessed area 314_2.

[0074] The depth of the recess 314_2 in the first member 310_2 according to Modification 2 is smaller than the depth of the recess 314_1 in the first member 310_1 according to Modification 1. Therefore, only a portion (the rear end portion) of the magnetic core 100 is positioned around the recess 314_2 of the first member 310_2. The rest of the magnetic core 100 is positioned inside the main body portion 311_2, which is behind the recess 314_2.

[0075] When the first member 310_2 and the second member 320_2 are connected, the protrusion 324_2 is inserted into the recess 314_2, and a portion of the connection points (rear portion) of the male terminals 211A, 211B and female terminals 221A, 221B are positioned inside the magnetic core 100. The remaining portion of the connection points (front portion) of the male terminals 211A, 211B and female terminals 221A, 221B, as well as the fixing portions 223A, 223B, are positioned outside the magnetic core 100. As a result, even if the contact resistance between the male terminals 211A, 211B and female terminals 221A, 221B increases due to vibration or the like, heat generation inside the magnetic core 100 can be suppressed, and the deterioration of the magnetic properties of the magnetic core can be suppressed. Furthermore, since some of the connection points of the male terminals 211A, 211B and the female terminals 221A, 221B are located inside the magnetic core 100, it is possible to suppress the increase in size of the noise reduction device 10_2.

[0076] Figure 11 is a cross-sectional view showing a third modified example of the housing configuration in the noise reduction device according to the embodiment.

[0077] In the third modified example shown in Figure 11, the second busbar 220A and the fourth busbar 220B are held by the first member 310_3 that holds the magnetic core 100 in the housing 300_3, and the first busbar 210A and the third busbar 210B are held by the second member 320_3.

[0078] A projection 315_3 is provided at the center of the front end surface of the main body portion 311_3 of the first member 310_3. The tip and part of the female terminals 221A and 221B are located inside the projection 315_3, while the remaining parts of the female terminals 221A and 221B are located inside the main body portion 321_2, which is behind the projection 315_3. The fastening portions 223A and 223B are also located inside the main body portion 311_3, which is behind the projection 315_3.

[0079] A recessed area 325_3 is provided in the center of the rear end surface of the main body portion 321_3 of the second member 320_1. The shape and size of the recessed area 325_3 correspond to the shape and size of the protrusion 315_3, and the protrusion 315_3 can be inserted into the recessed area 325_3.

[0080] The magnetic core 100 is positioned inside the main body portion 311_3, rear of the protrusion 315_3 of the first member 310_3. Therefore, when the first member 310_3 and the second member 320_3 are connected, the protrusion 315_3 is inserted into the recess 325_3, and the entire connection points of the male terminals 211A, 211B and female terminals 221A, 221B are positioned outside the magnetic core 100. The fixing portions 223A, 223B are positioned inside the magnetic core 100. As a result, even if the contact resistance between the male terminals 211A, 211B and the female terminals 221A, 221B increases due to vibration or the like, heat generation inside the magnetic core 100 can be suppressed, and the deterioration of the magnetic properties of the magnetic core can be suppressed. Furthermore, because the fixing portions 223A, 223B are positioned inside the magnetic core 100, the size of the noise reduction device 10_3 can be suppressed.

[0081] Figure 12 is a cross-sectional view showing a fourth modified example of the housing configuration in the noise reduction device according to the embodiment.

[0082] In the fourth modified example shown in Figure 12, the first busbar 210A and the third busbar 210B are held by the first member 310_4 which holds the magnetic core 100 in the housing 300_4, and the second busbar 220A and the fourth busbar 220B are held by the second member 320_4.

[0083] A projection 326_4 is provided at the center of the front end surface of the main body portion 321_4 of the second member 320_4. The front-to-back length of the second member 320_4, including the projection 326_4, is slightly greater than the front-to-back length of the female terminals 221A and 221B. Parts of the female terminals 221A and 221B and the fixing portions 223A and 223B are located inside the projection 326_4, while the remaining parts of the female terminals 221A and 221B are located inside the main body portion 321_4 behind the projection 326_4.

[0084] A magnetic core 100 is housed inside the main body portion 311_4 of the first member 310_4.

[0085] When the first member 310_4 and the second member 320_4 are connected, the two male terminals 211A and 211B that protrude forward from the center of the main body 311_4 of the first member 310_4 are inserted into the female terminals 221A and 221B located on the main body 321_4 of the second member 320_4. Therefore, in the noise reduction device 10_4 according to the fourth modified example, the entire connection points of the male terminals 211A and 211B and the female terminals 221A and 221B, as well as the fixing parts 223A and 223B, are located outside the magnetic core 100. As a result, even if the contact resistance between the male terminals 211A and 211B and the female terminals 221A and 221B increases due to vibration or the like, heat generation inside the magnetic core 100 can be suppressed, and the deterioration of the magnetic properties of the magnetic core can be suppressed.

[0086] [5. Supplementary Notes] The embodiments disclosed herein are illustrative in all respects and are not restrictive. The scope of the present invention is indicated by the claims rather than by the embodiments described above, and includes all modifications within the meaning and scope of the equivalents of the claims. [Explanation of Symbols]

[0087] 1. In-vehicle systems 10,10_1,10_2,10_3,10_4 Noise Reduction Device 20 Power converter 30 DC / DC Converters 40 batteries 50 ECU 100 Magnetic Cores 200 Busba 210A, 210_1, 210_2, 210_3 First bus bar 211A, 211B, 211_1, 211_2, 211_3 Male terminals 212A,212_1,212_2,212_3 1st conductive part 213_1, 213_2 Fixing part 220A, 220_1, 220_2, 220_3 Second bus bar 221A, 221B, 221_1, 221_2, 221_3 Female terminals 222A, 222B, 222_1, 222_2, 222_3 2nd conductive part 223A, 223B, 223_1, 223_2, 223_3 Fixing part 210B No. 3 Bus Bar 220B No. 4 Bus Bar 300,300_1,300_2,300_3,300_4 Housing 310, 310_1, 310_2, 310_3, 310_4 First member 311, 311_1, 311_2, 311_3, 311_4 Main body 312 Guide groove 313 Recess 314_1,314_2 recess 315_3 Projection 320, 320_1, 320_2, 320_3, 320_4 Second member 321, 321_1, 321_2, 321_3, 321_4 Main body 321 Slide section 323 Hook 324_1,324_2 Protrusion 325_3 Recess 326_4 Protrusion

Claims

1. First Bass Bar, Second Bass Bar, An annular magnetic core surrounding at least one of the first busbar and the second busbar, Equipped with, The first busbar includes a first conductive portion through which current flows, and a male terminal provided at the end of the first conductive portion. The second busbar includes a second conductive portion through which current flows, and a female terminal provided at the end of the second conductive portion and connected to the male terminal. The male terminal is inseparable from the first conductive part. The female terminal is inseparable from the second conductive part. Noise reduction device.

2. The female terminal is fixed to the second conductive part. The noise reduction device according to claim 1.

3. The male terminal is the end of the first conductive part, The noise reduction device according to claim 1.

4. At least a portion of the connection points between the male terminal and the female terminal are located inside the magnetic core. The noise reduction device according to claim 1.

5. The connection points of the male terminal and the female terminal are located outside the magnetic core. The noise reduction device according to claim 1.

6. The female terminal is fixed to the end of the second conductive part, The fixing point between the female terminal and the second conductive part is located inside the magnetic core. The noise reduction device according to claim 5.

7. The female terminal is fixed to the end of the second conductive part, The fixing point between the female terminal and the second conductive part is located outside the magnetic core. The noise reduction device according to claim 5.

8. The housing further comprises the magnetic core, The aforementioned housing is A first member that holds the magnetic core, A second member connectable to the first member, Includes, The first conductive portion penetrates the first member, The second conductive portion penetrates the second member, A noise reduction device according to any one of claims 1 to 7.

9. A third busbar is positioned in a direction intersecting the central axis direction of the magnetic core, and is aligned with the first busbar. A fourth busbar is arranged in the aforementioned intersecting direction, alongside the second busbar. Furthermore, The end of the third busbar and the end of the fourth busbar are connected to each other. The third busbar penetrates the first member at a position separated from the position where the first conductive portion penetrates the first member. The fourth busbar penetrates the second member at a position separated from the position where the second conductive portion penetrates the second member. The noise reduction device according to claim 8.

10. The housing further comprises the magnetic core, The aforementioned housing is A first member that holds the magnetic core, A second member connectable to the first member, Includes, The first conductive portion penetrates the second member, The second conductive portion penetrates the first member, A noise reduction device according to any one of claims 1 to 7.

11. A third busbar is positioned in a direction intersecting the central axis direction of the magnetic core, and is aligned with the first busbar. A fourth busbar is arranged in the aforementioned intersecting direction, alongside the second busbar. Furthermore, The end of the third busbar and the end of the fourth busbar are connected to each other. The third busbar penetrates the second member at a position separated from the position where the first conductive portion penetrates the second member. The fourth busbar penetrates the first member at a position separated from the position where the second conductive portion penetrates the first member. The noise reduction device according to claim 10.

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