EMC filter

Abstract

The utility model belongs to the technical field of filters, and discloses an EMC filter which comprises a first copper bar assembly, a second copper bar assembly, a transition assembly and a magnetic ring. The first copper bar assembly comprises a first copper bar, and a second copper bar and a third copper bar which are respectively arranged at two sides of the first copper bar; the second copper bar comprises a fourth copper bar which is arranged corresponding to the first copper bar and is connected with the first copper bar, a fifth copper bar which is arranged corresponding to the second copper bar at an interval, and a sixth copper bar which is arranged corresponding to the third copper bar at an interval; the transition assembly comprises a first transition copper bar and a second transition copper bar, the first transition copper bar is used for connecting the second copper bar and the fifth copper bar, and the second transition copper bar is used for connecting the third copper bar and the sixth copper bar; and the magnetic ring is sleeved outside the first copper bar assembly and / or the second copper bar assembly. According to the EMC filter, the three-copper-bar structure is designed in a sectional manner, so that the magnetic rings can be conveniently sleeved outside the copper bars, the filtering effect is ensured, and the power density is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to filter technical field especially relates to a EMC filter. BACKGROUND

[0002] EMC filter, full name electromagnetic compatibility filter, is a kind of electronic equipment for inhibiting electromagnetic interference, in electric automobile, EMC filter is usually installed near the key electronic equipment, prevent electromagnetic interference between electronic equipment, it is indispensable component in electric automobile. With the high integration development of electric automobile, its power unit also integrated more and more function modules, such as the integration of motor and power module, and EMC filter is integrated with power module, it improves driving efficiency, also reduces space occupation, improves the power density of electric automobile power unit as a whole.

[0003] In prior art, the copper bar used in the design of EMC filter is mostly one-piece plate material, resulting in that the overall structure of copper bar is large, magnetic ring is difficult to install in EMC filter or needs to use large-size magnetic ring to occupy large installation space;In prior art, there is also the structure of segmented connection of copper bar to facilitate the installation of magnetic ring, but the method cannot be applied to EMC filter with three-copper-bar structure. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of EMC filter, realize the segmented connection of EMC filter with three-copper-bar structure to facilitate the installation of magnetic ring.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A kind of EMC filter, wherein, it include:

[0007] First copper bar assembly, the first copper bar assembly includes first copper bar and the second copper bar and third copper bar respectively arranged in the first copper bar two sides;

[0008] Second copper bar assembly, the second copper bar assembly includes the fourth copper bar corresponding with the first copper bar and being connected with the first copper bar, the fifth copper bar corresponding with the second copper bar and being spaced apart, and the sixth copper bar corresponding with the third copper bar and being spaced apart;

[0009] Transition assembly, the transition assembly includes first transition copper bar and second transition copper bar, the first transition copper bar is used to connect the second copper bar with the fifth copper bar, and the second transition copper bar is used to connect the third copper bar with the sixth copper bar;

[0010] Magnetic ring, the magnetic ring is sleeved in the first copper bar assembly and / or the second copper bar assembly.

[0011] As preferably, one end of the first copper bar and the fourth copper bar connected with each other is correspondingly provided with a stepped joint.

[0012] As preferably, one end of the second copper bar and the fifth copper bar close to each other is provided with a first connecting groove for connecting with the first transition copper bar, and one end of the third copper bar and the sixth copper bar close to each other is provided with a second connecting groove for connecting with the second transition copper bar.

[0013] As preferably, a first isolation shell is arranged outside the first copper bar assembly, and one end of the first copper bar assembly close to the second copper bar assembly protrudes out of the first isolation shell, and a second isolation shell is arranged outside the second copper bar assembly, and one end of the second copper bar assembly close to the first copper bar assembly protrudes out of the second isolation shell.

[0014] As preferably, the first copper bar, the second copper bar and the third copper bar are parallel arranged flat plate type copper bars, and the magnetic ring is sleeved on the part of the first copper bar assembly protruding out of the first isolation shell.

[0015] As preferably, a sheath is sleeved outside the magnetic ring, the sheath is provided with a butt joint hole, and the second isolation shell is provided with a butt joint plug for butt joint with the butt joint hole.

[0016] As preferably, the butt joint hole and the butt joint plug are provided with two groups, one group of the butt joint hole and the butt joint plug is arranged on one side of the first transition copper bar and the second transition copper bar, and the other group is arranged on the other side of the first transition copper bar and the second transition copper bar.

[0017] As preferably, an inner isolation piece is arranged between the connection part of the first copper bar and the fourth copper bar and the first transition copper bar, and between the connection part of the first copper bar and the fourth copper bar and the second transition copper bar.

[0018] As preferably, an outer isolation piece is arranged on the side of the first transition copper bar and the second transition copper bar away from each other.

[0019] As preferably, the first transition copper bar is cladded and connected between the second copper bar and the fifth copper bar, and the second transition copper bar is cladded and connected between the third copper bar and the sixth copper bar.

[0020] Beneficial effects:

[0021] The embodiment provides an EMC filter which comprises a first copper bar assembly, a second copper bar assembly, a transition assembly and a magnetic ring. The first copper bar assembly, the second copper bar assembly and the transition assembly are of a segmented design, the magnetic ring is sleeved at a preset position before the first copper bar assembly and the second copper bar assembly are connected, and the first copper bar assembly, the second copper bar assembly and the transition assembly are connected after the sleeving of the magnetic ring is completed, so that the EMC filter is completely installed. Through the segmented design, the magnetic ring with proper size can be sleeved outside the copper bar, the filtering effect is guaranteed, and the power density is improved. In addition, the first copper bar and the fourth copper bar are connected, and the other copper bars on the two sides are arranged at intervals and connected through the transition copper bars. Therefore, when the first copper bar assembly and the second copper bar assembly are connected, the first copper bar and the fourth copper bar can be connected and fixed first, so that the copper bars on the two sides do not interfere with the copper bar in the middle, and then the overall connection is completed through the first transition copper bar and the second transition copper bar, so that the segmented connection of the EMC filter with the three-copper-bar structure is realized. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is the overall schematic view of the EMC filter provided by the utility model;

[0023] Figure 2 is the structure explosion drawing of the EMC filter provided by the utility model;

[0024] Figure 3 is the cross-sectional view of the EMC filter provided by the utility model;

[0025] Figure 4 is the cooperation schematic view of the copper bar assembly and the magnetic ring of the EMC filter provided by the utility model.

[0026] In the drawing:

[0027] 11-third copper bar; 12-first copper bar; 13-second copper bar;

[0028] 21-sixth copper bar; 22-fourth copper bar; 23-fifth copper bar;

[0029] 31-first transition copper bar; 32-second transition copper bar;

[0030] 4-inner isolation piece; 5-outer isolation piece; 6-magnetic ring; 7-butting hole; 8-first isolation shell; 9-second isolation shell; 101-first welding point; 102-second welding point; 103-third welding point; 104-fourth welding point; 105-fifth welding point. DETAILED DESCRIPTION

[0031] The utility model will be further described in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, and not to limit the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0032] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0033] In the utility model, unless otherwise explicitly specified and limited, the first feature is "on" or "below" the second feature, which can include direct contact between the first and second features, or indirect contact between the first and second features through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0034] In the description of the embodiment, the terms "up", "down", "right", etc. orientation or position relationship is based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0035] As Figures 1-4As shown, the embodiment provides an EMC filter, which includes a first copper bar assembly, a second copper bar assembly, a transition assembly and a magnetic ring 6. The first copper bar assembly includes a first copper bar 12, a second copper bar 13 and a third copper bar 11 arranged on both sides of the first copper bar 12 respectively; the second copper bar assembly includes a fourth copper bar 22 arranged corresponding to the first copper bar 12 and connected with the first copper bar 12, a fifth copper bar 23 arranged corresponding to the second copper bar 13 and a sixth copper bar 21 arranged corresponding to the third copper bar 11. That is, the first copper bar 12 extending out of the second copper bar 13 and the third copper bar 11 is connected with the fourth copper bar 22 extending out of the fifth copper bar 23 and the sixth copper bar 21, and the remaining copper bars are arranged on both sides and spaced apart. The transition assembly includes a first transition copper bar 31 for connecting the second copper bar 13 and the fifth copper bar 23, and a second transition copper bar 32 for connecting the third copper bar 11 and the sixth copper bar 21; the magnetic ring 6 is sleeved outside the first copper bar assembly and / or the second copper bar assembly.

[0036] The copper bar assembly in the EMC filter generally includes straight plate copper bars and curved plate copper bars based on the design requirements and the angle of functional implementation; and based on the requirements of preventing circuit short circuit, improving heat dissipation efficiency and the like, each copper bar in the copper bar assembly needs to be arranged at intervals, and each copper bar is provided with mounting protrusions in the circumferential direction. If the copper bar assembly is an integral structure, the magnetic ring 6 is difficult to directly pass through the curved plate and the mounting protrusions and the like and be sleeved in the preset position. In the embodiment, the first copper bar assembly and the second copper bar assembly in the EMC filter are designed in a segmented manner, the magnetic ring 6 is sleeved outside the first copper bar assembly and / or the second copper bar assembly, and then the first copper bar assembly and the second copper bar assembly are connected, so that the magnetic ring 6 can be directly sleeved outside the copper bars from the unconnected position, avoiding the difficulty in installation of the magnetic ring 6 caused by the spatial structure and volume of the copper bars. Specifically, the first copper bar 12 and the fourth copper bar 22 are longer, and the remaining copper bars are shorter, so that when the first copper bar assembly and the second copper bar assembly are connected, the first copper bar 12 and the fourth copper bar 22 can be connected first, and the remaining copper bars are located on both sides and do not shield the connection position of the first copper bar 12 and the fourth copper bar 22, nor do they interfere with the connection, facilitating the fixation of the first copper bar 12 and the fourth copper bar 22 by welding or the like. The magnetic ring 6 is sleeved outside the second copper bar 13 and the third copper bar 11 and / or the fifth copper bar 23 and the sixth copper bar 21, and does not affect the installation of the first transition copper bar 31 and the second transition copper bar 32. Further, the second copper bar 13 and the third copper bar 11 are symmetrically arranged along the first copper bar 12 at one end close to the fourth copper bar 22, and the fifth copper bar 23 and the sixth copper bar 21 are symmetrically arranged along the fourth copper bar 22 at one end close to the first copper bar 12, at this time, the interval distance between the second copper bar 13 and the fifth copper bar 23 is equal to the interval distance between the third copper bar 11 and the sixth copper bar 21, and the first transition copper bar 31 and the second transition copper bar 32 can use copper bar pieces of the same structure, enhancing the universality of the workpiece.

[0037] Specifically, in the embodiment, the end of the first copper bar 12 and the fourth copper bar 22 connected to each other is provided with a stepped joint. The stepped joint at the first copper bar 12 includes a first joint protrusion located on the side close to the first transition copper bar 31 and a first joint recess located on the side close to the second transition copper bar 32; the stepped joint at the fourth copper bar 22 includes a second joint recess located on the side close to the first transition copper bar 31 and a second joint protrusion located on the side close to the second transition copper bar 32, when the first copper bar 12 and the fourth copper bar 22 are connected, the end of the first joint protrusion abuts against the second joint recess, the end of the second joint protrusion abuts against the first joint recess, and the two side walls of the first joint protrusion and the second joint protrusion close to each other abut against each other. The stepped joint facilitates the butt joint positioning of the first copper bar 12 and the fourth copper bar 22. After the butt joint is completed, welding is performed on the first welding point 101, so that the first copper bar 12 and the fourth copper bar 22 are relatively fixed, and after being relatively fixed, the first copper bar 12 and the fourth copper bar 22 can be electrically connected. The use of the stepped joint ensures the butt joint accuracy of the first copper bar 12 and the fourth copper bar 22, avoids deviation during positioning, and affects the conductivity between the first copper bar 12 and the fourth copper bar 22. In addition, the stepped joint increases the contact area between the first copper bar 12 and the fourth copper bar 22, and enhances the stability after being relatively fixed. Further, the corresponding stepped joint after being connected does not leave a gap between the first copper bar 12 and the fourth copper bar 22, and after welding, the first copper bar 12 and the fourth copper bar 22 form a new integral plate, which ensures the current efficiency between the first copper bar 12 and the fourth copper bar 22.

[0038] Specifically, the end of the second copper bar 13 and the fifth copper bar 23 close to each other is provided with a first connecting groove for connecting the first transition copper bar 31, and the end of the third copper bar 11 and the sixth copper bar 21 close to each other is provided with a second connecting groove for connecting the second transition copper bar 32. When the first transition copper bar 31 and the second transition copper bar 32 are installed, the first connecting groove and the second connecting groove can play the role of positioning and limiting.

[0039] Further, the first connecting groove is arranged on the side of the second copper bar 13 away from the first copper bar 12 and the side of the fifth copper bar 23 away from the fourth copper bar 22. When the first transition copper bar 31 is installed, the first copper bar assembly and the second copper bar assembly are rotated so that the second copper bar 13 and the fifth copper bar 23 are located at the uppermost position, and the first transition copper bar 31 is horizontally placed in the first connecting groove, which can bear the first transition copper bar 31. At this time, the first transition copper bar 31 can be fixed relative to the second copper bar 13 and the fifth copper bar 23 by welding or other methods. The arrangement of the first connecting groove enables the first transition copper bar 31 to have sufficient contact area with the second copper bar 13 and the fifth copper bar 23, thereby enhancing the stability after relative fixation. After the first transition copper bar 31 is connected and fixed, there is no gap between the first transition copper bar 31 and the second copper bar 13 and the fifth copper bar 23, and the second copper bar 13 and the fifth copper bar 23 are welded as a new integrated plate, thereby ensuring the electrical connection efficiency between the second copper bar 13 and the fifth copper bar 23. Similarly, the second connecting groove can be arranged correspondingly with the first connecting groove, and the second transition copper bar 32 can be installed in the above-mentioned manner.

[0040] Specifically, the first copper bar assembly is provided with a first isolation shell 8, and the end of the first copper bar assembly close to the second copper bar assembly protrudes out of the first isolation shell 8. The second copper bar assembly is provided with a second isolation shell 9, and the end of the second copper bar assembly close to the first copper bar assembly protrudes out of the second isolation shell 9. The first isolation shell 8 and the second isolation shell 9 are both made of insulating material, which can shield the first copper bar assembly and the second copper bar assembly in a large area, thereby avoiding electrical connection between the first copper bar assembly and the second copper bar assembly and circuit failure. When the magnetic ring 6 is installed, it is sleeved on the protruding part of the first copper bar assembly and / or the second copper bar assembly, and at this time the magnetic ring 6 can play a good filtering effect. At the same time, the first isolation shell 8 and the second isolation shell 9 can also play an auxiliary fixing effect on the first copper bar assembly and the second copper bar assembly. The copper bars are arranged in parallel and are fixed on the first isolation shell 8 and the second isolation shell 9 respectively to avoid direct contact between the copper bars. Further, the first isolation shell 8 and the second isolation shell 9 are both made of plastic material.

[0041] Further, in the present embodiment, the first copper bar 12, the second copper bar 13 and the third copper bar 11 are parallelly arranged flat plate type copper bars, and the magnetic ring 6 is sleeved on the part of the first copper bar assembly protruding out of the first isolation shell 8. The length of the first copper bar assembly protruding out of the first isolation shell 8 is relatively long, which is convenient for the magnetic ring 6 to be sleeved. At this time, the second copper bar assembly can be a curved plate copper bar, which is convenient for improving the overall space utilization rate of the EMC filter.

[0042] Further, the magnetic ring 6 is sleeved with a sheath, the sheath is provided with a butt joint hole 7, and the second isolation shell 9 is provided with a butt joint plug for butt joint with the butt joint hole 7. The sheath is sleeved on the circumference of the magnetic ring 6 and covers the circumference of the magnetic ring 6, so that the sheath can provide physical protection for the magnetic ring 6 and prevent the magnetic ring 6 from being damaged due to scratching, bumping and the like and thus weakening the function. When the first copper bar assembly and the second copper bar assembly are connected and fixed, the butt joint hole 7 is inserted into the butt joint plug in cooperation, and the first copper bar assembly and the second copper bar assembly are in position correspondence when the butt joint hole 7 and the butt joint plug are inserted in cooperation, and the first copper bar 12 and the fourth copper bar 22 are in contact with each other and are inserted in cooperation after butt joint. That is, the butt joint hole 7 on the sheath and the butt joint plug cooperate with each other, so that the first copper bar assembly and the second copper bar assembly are butt jointed as a whole. In addition, the length of the butt joint plug is not greater than the length of the butt joint hole 7, that is, the butt joint plug does not protrude from the end of the butt joint hole 7 away from the butt joint plug, which helps to save the material of the butt joint plug. Further, the end of the butt joint plug away from the butt joint hole 7 is further provided with an abutting portion, the abutting portion can abut against one side of the magnetic ring 6 when the butt joint plug and the butt joint hole 7 are butt jointed, and the movement of the magnetic ring 6 towards the second isolation shell 9 is limited; at the same time, the first isolation shell 8 abuts against the other side of the magnetic ring 6, and the movement of the magnetic ring 6 towards the first isolation shell 8 is limited, so that the magnetic ring 6 can be completely fixed between the first isolation shell 8 and the second isolation shell 9.

[0043] Further, the butt joint hole 7 and the butt joint plug are provided in two groups, one group of the butt joint hole 7 and the butt joint plug is arranged on one side of the first transition copper bar 31 and the second transition copper bar 32, and the other group is arranged on the other side of the first transition copper bar and the second transition copper bar. The butt joint plug has a certain width, and when the butt joint plug and the butt joint hole 7 are inserted and butt jointed, the side edges of the first copper bar assembly protruding from the first isolation shell 8, the second copper bar assembly protruding from the second isolation shell 9, the first transition copper bar 31 and the second transition copper bar 32 can be covered, so that the side edges are prevented from being electrically connected with the outside.

[0044] Specifically, an inner separator 4 is provided between the connection of the first copper bar 12 and the fourth copper bar 22 and the first transition copper bar 31, and an inner separator 4 is provided between the connection of the first copper bar 12 and the fourth copper bar 22 and the second transition copper bar 32. The inner separator 4 is made of insulating material, and its cross section is T-shaped. Taking the inner separator 4 between the second copper bar 13 and the fifth copper bar 23 as an example, the left and right ends of its T-shaped structure abut against the second copper bar 13 and the fifth copper bar 23 respectively, and the bottom of the T-shaped structure abuts against the connection of the first copper bar 12 and the fourth copper bar 22, that is, the main body of the inner separator 4 can be installed in the interval gap between the second copper bar 13 and the fifth copper bar 23. After the inner separator 4 is installed, the first transition copper bar 31 is installed. At this time, the inner separator 4 can avoid the first transition copper bar 31 from directly contacting the first copper bar 12 and the fourth copper bar 22, and when the first transition copper bar 31 is soldered, the inner separator 4 can also avoid solder falling to the first copper bar 12 and the fourth copper bar 22. Furthermore, the inner isolator 4 is further provided with an inner snap-fit ​​frame, which is used to snap-fit ​​the inner isolator 4 to the connection between the first copper bar 12 and the fourth copper bar 22 to achieve installation and fixation of the inner isolator 4 .

[0045] Specifically, the side that the first transition copper bar 31 and the second transition copper bar 32 are away from each other is provided with an outer isolator 5. The outer isolator 5 is used to realize the isolation of the first transition copper bar 31 and the second transition copper bar 32 from the outside world, and prevents the first transition copper bar 31 and the second transition copper bar 32 from being electrically connected to the outside world. Further, the cross-sectional area of ​​the outer isolator 5 is slightly larger than the first transition copper bar 31 and the second transition copper bar 32, and one side of the outer isolator 5 abuts against the first isolation shell 8, and the other side abuts against the second isolation shell 9 to completely cover the two sides of the copper bar assembly that will extend out of the first isolation shell 8 and the second isolation shell 9. In addition, the two sides of the copper bar assembly can be covered by the docking block, and the technical effect of fully isolating the energized components in the EMC filter from the outside world can be realized by cooperating with the outer isolator 5. Further, the interior isolator 4 is also provided with an outer connection frame, which can be fixed in conjunction with the outer isolator 5 to realize the installation and fixing of the outer isolator 5.

[0046] Specifically, the first transition copper row 31 is hardfacingly connected between the second copper row 13 and the fifth copper row 23, and the second transition copper row 32 is hardfacingly connected between the third copper row 11 and the sixth copper row 21. Taking the first transition copper row 31 as an example, when the first transition copper row 31 is installed, rotating the first copper row assembly and the second copper row assembly will place the second copper row 13 and the fifth copper row 23 at the uppermost position, and then the first transition copper row 31 is placed in the first connecting groove, at this time the first transition copper row 31 is located at the upper position and the copper material at the first connecting groove is located at the lower position, both in a stacked state, then the copper material is melted by laser, and after the copper material cools and solidifies, the fourth welding point 104 and the fifth welding point 105 are welded and fixed, after the hardfacing is completed, the second copper row 13, the first transition copper row 31 and the fifth copper row 23 become an integrated copper plate, and the second copper row 13 and the fifth copper row 23 can be electrically connected through the first transition copper row 31. Similarly, the second transition copper row 32 can also be welded and fixed by the above method to realize the welding and fixation of the second welding point 102 and the third welding point 103, and make the third copper row 11, the second transition copper row 32 and the sixth copper row 21 into an integrated copper plate to realize electrical connection.

[0047] Specifically, the EMC filter in the embodiment is assembled by the following steps:

[0048] S1: The magnetic ring 6 is sleeved on the part of the first copper row assembly extending out of the first isolation shell 8, and a protective sleeve is sleeved outside the magnetic ring 6;

[0049] S2: The first copper row 12 is abutted with the fourth copper row 22 by inserting the butt joint hole 7 into the butt joint block, and then the first welding point 101 at the connection between the first copper row 12 and the fourth copper row 22 is welded and fixed;

[0050] S3: The inner isolation piece 4 is installed and fixed on both sides of the connection between the first copper row 12 and the fourth copper row 22;

[0051] S4: The first transition copper row 31 is placed in the first installation groove for hardfacing fixation, and the second transition copper row 32 is placed in the second installation groove for hardfacing fixation;

[0052] S5: One outer isolation piece 5 is installed on each side of the first transition copper row 31 and the second transition copper row 32 away from each other.

[0053] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the present application. Here, it is not necessary and also impossible to enumerate all the implementation modes. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application claim.

Claims

1. An EMC filter, characterized in that, The application relates to a copper bar assembly. The first copper bar assembly comprises a first copper bar (12), a second copper bar (13) and a third copper bar (11) arranged on both sides of the first copper bar (12) respectively. The second copper bar assembly comprises a fourth copper bar (22) corresponding to the first copper bar (12) and connected with the first copper bar (12), a fifth copper bar (23) arranged at intervals corresponding to the second copper bar (13), and a sixth copper bar (21) arranged at intervals corresponding to the third copper bar (11). The transition assembly comprises a first transition copper bar (31) for connecting the second copper bar (13) and the fifth copper bar (23), and a second transition copper bar (32) for connecting the third copper bar (11) and the sixth copper bar (21). A magnetic ring (6) is arranged outside the first copper bar assembly and / or the second copper bar assembly.

2. The EMC filter according to claim 1, characterized in that The end of the first copper bar (12) and the fourth copper bar (22) connected with each other is provided with a stepped joint.

3. The EMC filter of claim 1, wherein, The end of the second copper bar (13) and the fifth copper bar (23) close to each other is provided with a first connecting groove for connecting with the first transition copper bar (31), and the end of the third copper bar (11) and the sixth copper bar (21) close to each other is provided with a second connecting groove for connecting with the second transition copper bar (32).

4. The EMC filter of claim 1, wherein, A first isolation shell (8) is arranged outside the first copper bar assembly, and the end of the first copper bar assembly close to the second copper bar assembly extends out of the first isolation shell (8); a second isolation shell (9) is arranged outside the second copper bar assembly, and the end of the second copper bar assembly close to the first copper bar assembly extends out of the second isolation shell (9).

5. The EMC filter of claim 4, characterized in that, The first copper bar (12), the second copper bar (13) and the third copper bar (11) are parallel flat plate type copper bars, and the magnetic ring (6) is arranged outside the part of the first copper bar assembly extending out of the first isolation shell (8).

6. The EMC filter of claim 4, wherein, A sheath is arranged outside the magnetic ring (6), the sheath is provided with a butt joint hole (7), and the second isolation shell (9) is provided with a butt joint plug for butt joint with the butt joint hole (7).

7. The EMC filter according to claim 6, characterized in that The butt joint hole (7) and the butt joint plug are provided with two groups, one group of the butt joint hole (7) and the butt joint plug is arranged on one side of the first transition copper bar (31) and the second transition copper bar (32), and the other group is arranged on the other side of the first transition copper bar (31) and the second transition copper bar (32).

8. The EMC filter according to any of claims 1-7, characterized by An inner isolation piece (4) is arranged between the connection part of the first copper bar (12) and the fourth copper bar (22) and the first transition copper bar (31), and between the connection part of the first copper bar (12) and the fourth copper bar (22) and the second transition copper bar (32).

9. The EMC filter according to any of claims 1-7, characterized by An outer isolation piece (5) is arranged on the side of the first transition copper bar (31) and the second transition copper bar (32) away from each other.

10. The EMC filter according to any of claims 1-7, characterized by The first transition copper bar (31) is hard-soldered between the second copper bar (13) and the fifth copper bar (23), and the second transition copper bar (32) is hard-soldered between the third copper bar (11) and the sixth copper bar (21).

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