Capacitor

Abstract

The invention provides a capacitor. The capacitor comprises a first main electrode, a second main electrode, a grounding busbar, a first switching busbar, a second switching busbar, a first Y capacitor and a second Y capacitor, the first main electrode and the second main electrode are arranged on the grounding busbar in a penetrating mode, the first switching busbar and the second switching busbar are arranged on one side of the grounding busbar at intervals, and at least one first Y capacitor parallel to the first main electrode is arranged between the first switching busbar and the grounding busbar. At least one second Y capacitor parallel to the second main electrode is arranged between the second switching busbar and the grounding busbar; the first electrode face and the second electrode face of the first Y capacitor are connected with the grounding busbar and the first switching busbar in a one-to-one correspondence mode, the first switching busbar is connected with the first main electrode, the first electrode face and the second electrode face of the second Y capacitor are connected with the grounding busbar and the second switching busbar in a one-to-one correspondence mode, and the second switching busbar is connected with the second main electrode. The capacitor is compact in structure and low in inductance.

Description

Technical Field

[0001] This invention relates to the field of electronic technology, and more specifically to a capacitor. Background Technology

[0002] In the design of electrode controller structure, the high-frequency common-mode noise generated by power electronic devices (such as IGBTs) during high-speed switching needs to be discharged through a low-impedance discharge path provided by a Y capacitor; otherwise, conducted interference will exceed the standard.

[0003] Y capacitors can effectively block interference by crossing the positive and negative terminals with ground. However, when using Y capacitors, in order to maintain low impedance characteristics at higher frequencies, low inductance is required in the circuit. Often, due to the use of standard leaded capacitors in the design, there is a problem of excessive inductance in the circuit and insignificant filtering effect. In the case of existing standard leaded capacitors, the capacitor core inside is what actually works, while other leads, casings and other connecting parts account for 20%-40% of the total volume, resulting in problems such as large size and limited installation space for standard Y capacitors. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the aforementioned art. Therefore, the object of the present invention is to provide a capacitor with a compact structure and low inductance.

[0005] To achieve the above objectives, the present invention proposes a capacitor comprising: a first main electrode, a second main electrode, a ground busbar, a first transfer busbar, a second transfer busbar, a first Y capacitor, and a second Y capacitor; Both the first main electrode and the second main electrode are passed through the grounding busbar. Both the first transition busbar and the second transition busbar are spaced apart on one side of the grounding busbar. At least one first Y capacitor parallel to the first main electrode is provided between the first transition busbar and the grounding busbar. At least one second Y capacitor parallel to the second main electrode is provided between the second transition busbar and the grounding busbar. The first electrode surface and the second electrode surface of the first Y capacitor are connected to the ground busbar and the first transfer busbar in a one-to-one correspondence, and the first transfer busbar is connected to the first main electrode. The first electrode surface and the second electrode surface of the second Y capacitor are connected to the ground busbar and the second transfer busbar in a one-to-one correspondence, and the second transfer busbar is connected to the second main electrode.

[0006] According to the capacitor proposed in this invention, by arranging a first Y capacitor and a second Y capacitor parallel to the periphery of the first and second main electrodes respectively, the Y capacitors are brought close to the main electrodes, significantly shortening the current loop path and reducing the loop area, thereby effectively reducing parasitic inductance. Simultaneously, at least one Y capacitor can be flexibly arranged on the periphery of the main electrodes, increasing the filtering capacity without requiring additional redundant space. Combined with the compact spacing of the transition busbar and ground busbar, this reduces redundant structures such as leads and casings found in traditional leaded capacitors, achieving miniaturization and high integration of the overall structure, ultimately resulting in a compact structure and low inductance.

[0007] In addition, a capacitor according to the above embodiments of the present invention may also have the following additional technical features: Optionally, the grounding busbar is provided with a first through hole for the first main electrode to pass through, a second through hole for the second main electrode to pass through, a first connecting portion for connecting the first electrode surface of the first Y capacitor, and a second connecting portion for connecting the first electrode surface of the second Y capacitor. The first connecting portion and the second connecting portion are located on the periphery of the first through hole and the second through hole respectively.

[0008] Furthermore, both the first connecting portion and the second connecting portion are hollowed out.

[0009] Optionally, the outer periphery of the first main electrode is provided with at least one first plane, the outer periphery of the second main electrode is provided with at least one second plane, the first Y capacitor is arranged parallel to the first plane, and the second Y capacitor is arranged parallel to the second plane.

[0010] Optionally, the two ends of the first main electrode extend out of the first and second electrode surfaces of the first Y capacitor in a corresponding manner to form a first extension segment and a second extension segment, and the two ends of the second main electrode extend out of the first and second electrode surfaces of the second Y capacitor in a corresponding manner to form a third extension segment and a fourth extension segment; the first adapter busbar is connected to the first extension segment, and the second adapter busbar is connected to the third extension segment.

[0011] Furthermore, the second extension section is provided with a first connecting hole, and the fourth extension section is provided with a second connecting hole.

[0012] Furthermore, the first extension section is provided with a third connection hole for connecting the first adapter busbar, and the third extension section is provided with a fourth connection hole for connecting the second adapter busbar.

[0013] Furthermore, the distance between the second extension segment and the fourth extension segment is less than the distance between the first extension segment and the third extension segment.

[0014] Optionally, it also includes a first shielding cover and a second shielding cover for shielding external electromagnetic interference, wherein the first shielding cover is disposed around the first Y capacitor and the second shielding cover is disposed around the second Y capacitor.

[0015] Furthermore, there are four first Y capacitors arranged around the periphery of the first main electrode; there are also four second Y capacitors arranged around the periphery of the second main electrode. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a capacitor according to an embodiment of the present invention; Figure 2 for Figure 1 A structural diagram from another perspective; Figure 3 This is a schematic diagram of the structure of a capacitor according to another embodiment of the present invention; Figure 4 for Figure 3 A structural diagram from another perspective; Figure 5 This is a schematic diagram of a capacitor with a shielding cover according to an embodiment of the present invention; Figure 6 for Figure 5 A structural diagram from another perspective; Explanation of reference numerals in the attached figures: First main electrode 1, first extension section 11, third connecting hole 111, second extension section 12, first connecting hole 121, second main electrode 2, third extension section 21, fourth connecting hole 211, fourth extension section 22, second connecting hole 221, grounding busbar 3, first through hole 31, second through hole 32, connecting pin 33, first connecting part 34, second connecting part 35, first adapter busbar 4, second adapter busbar 5, first Y capacitor 6, second Y capacitor 7, first shielding cover 8, second shielding cover 9. Detailed Implementation

[0017] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0018] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the invention to those skilled in the art.

[0019] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0020] The following is for reference. Figures 1-6 The implementation of the capacitor proposed in the embodiments of the present invention will be described in detail.

[0021] According to an embodiment of the present invention, the capacitor includes: a first main electrode 1, a second main electrode 2, a ground busbar 3, a first transition busbar 4, a second transition busbar 5, a first Y capacitor 6, and a second Y capacitor 7. Specifically, the first main electrode 1 and the second main electrode 2 are both passed through the grounding busbar 3, the first transition busbar 4 and the second transition busbar 5 are both spaced apart on one side of the grounding busbar 3, at least one first Y capacitor 6 parallel to the first main electrode 1 is provided between the first transition busbar 4 and the grounding busbar 3, and at least one second Y capacitor 7 parallel to the second main electrode 2 is provided between the second transition busbar 5 and the grounding busbar 3. The first electrode surface and the second electrode surface of the first Y capacitor 6 are connected to the ground busbar 3 and the first transfer busbar 4 in a one-to-one correspondence, and the first transfer busbar 4 is connected to the first main electrode 1. The first electrode surface and the second electrode surface of the second Y capacitor 7 are connected to the ground busbar 3 and the second transfer busbar 5 in a one-to-one correspondence, and the second transfer busbar 5 is connected to the second main electrode 2.

[0022] That is, the first main electrode 1 and the second main electrode 2 are both installed through the grounding busbar 3 and extend from both sides of the grounding busbar 3. The first transition busbar 4 and the second transition busbar 5 are both spaced apart on the same side of the grounding busbar 3. Between the first transition busbar 4 and the grounding busbar 3, at least one first Y capacitor 6 parallel to the first main electrode 1 is installed, so that the outer periphery of the first Y capacitor 6 can be close to the outer periphery of the first main electrode 1. Between the second transition busbar 5 and the grounding busbar 3, at least one second Y capacitor 7 parallel to the second main electrode 2 is installed, so that the outer periphery of the second Y capacitor 7 can be close to the outer periphery of the second main electrode 2. The first electrode surface of the first Y capacitor 6 is electrically connected to the grounding busbar 3, the second electrode surface of the first Y capacitor 6 is electrically connected to the first transition busbar 4, and the first transition busbar 4 is electrically connected to the first main electrode 1. The first electrode surface of the second Y capacitor 7 is electrically connected to the grounding busbar 3, the second electrode surface of the second Y capacitor 7 is electrically connected to the second transition busbar 5, and the second transition busbar 5 is electrically connected to the second main electrode 2. During operation, the first main electrode 1 and the first Y capacitor 6 form opposite currents, and the second main electrode 2 and the second Y capacitor 7 form opposite currents. The spacing between the first Y capacitor 6 and the first main electrode 1, and the spacing between the second Y capacitor 7 and the second main electrode 2 can be much closer than the existing through-hole structure where the main electrode passes through the center hole of the Y capacitor, which greatly reduces the inductance.

[0023] The first main electrode 1 and the second main electrode 2, the first transition busbar 4 and the second transition busbar 5 can all be symmetrically arranged. The number of first Y capacitors 6 can be four, and the four first Y capacitors 6 are arranged at intervals around the outer periphery of the first main electrode 1. The second Y capacitors 7 can be arranged in the same number and distribution to cooperate with the second main electrode 2. The first electrode surface of the first Y capacitor 6 and the grounding busbar 3, as well as the second electrode surface of the first Y capacitor 6 and the first transition busbar 4, can be connected by welding. The second Y capacitors 7 can be connected in the same way as the first Y capacitors 6. The grounding busbar 3 can be connected to an external grounding device through an extended connecting pin 33. The grounding busbar 3 can be L-shaped. The first main electrode 1 can be the positive electrode, the second main electrode 2 can be the negative electrode, and an X capacitor can also be arranged between the positive and negative electrodes.

[0024] Therefore, by arranging the first Y capacitor 6 and the second Y capacitor 7 parallel to the periphery of the first main electrode 1 and the second main electrode 2 respectively, the Y capacitors are brought close to the main electrodes, significantly shortening the current loop path and reducing the loop area, thereby effectively reducing parasitic inductance. Simultaneously, at least one Y capacitor can be flexibly arranged around the periphery of the main electrodes, increasing the filtering capacity without requiring additional redundant space. Combined with the compact spacing of the transition busbar and the ground busbar 3, this reduces redundant structures such as leads and casings of traditional leaded capacitors, achieving miniaturization and high integration of the overall structure, ultimately resulting in a compact structure and low inductance.

[0025] Optionally, the grounding busbar 3 is provided with a first through hole 31 for the first main electrode 1 to pass through, a second through hole 32 for the second main electrode 2 to pass through, a first connecting portion 34 for connecting the first electrode surface of the first Y capacitor 6, and a second connecting portion 35 for connecting the first electrode surface of the second Y capacitor 7. The first connecting portion 34 and the second connecting portion 35 are located on the periphery of the first through hole 31 and the second through hole 32 respectively. It can be understood that the grounding busbar 3 is provided with a first through hole 31 and a second through hole 32. The first main electrode 1 passes through the first through hole 31, and the second main electrode 2 passes through the second through hole 32. The first connecting portion 34 is located on the periphery of the first through hole 31, and the second connecting portion 35 is located on the periphery of the second through hole 32. The number and position of the first connecting portion 34 are matched according to the number and position of the first Y capacitor 6, and the number and position of the second connecting portion 35 are matched according to the number and position of the second Y capacitor 7. The first connecting portion 34 and the second connecting portion 35 can be electrically connected to the first Y capacitor 6 and the second Y capacitor 7 respectively using existing structures and processes.

[0026] Furthermore, both the first connecting portion 34 and the second connecting portion 35 are hollowed out. Understandably, the hollowed-out design of the first connecting portion 34 and the second connecting portion 35 allows the hollowed-out portion to fit against the first electrode surface of the first Y capacitor 6 and the first electrode surface of the second Y capacitor 7, ensuring the contact area at the connection point. Then, by welding or bonding, the first Y capacitor 6 is connected to the grounding busbar 3, and the second Y capacitor 7 is connected to the grounding busbar 3, utilizing the hollowed-out portion. The hollowed-out portion can be U-shaped, with the first connecting portion 34 communicating with the first through hole 31, and the second connecting portion 35 communicating with the second through hole 32.

[0027] Optionally, the outer periphery of the first main electrode 1 is provided with at least one first plane, and the outer periphery of the second main electrode 2 is provided with at least one second plane. The first Y capacitor 6 is arranged parallel to the first plane, and the second Y capacitor 7 is arranged parallel to the second plane. Understandably, by setting the outer periphery of the first main electrode 1 and the second main electrode 2 with planes, the first Y capacitor 6 and the second Y capacitor 7 can be placed close to the first main electrode 1 and the second main electrode 2, reducing the gap space between the main electrode and the Y capacitors. Simultaneously, when multiple Y capacitors are arranged around the main electrode, it is easier to maintain a uniform spacing between each Y capacitor and the main electrode, improving the stability of the structural layout and the balance of the filtering effect. The cross-section of the first main electrode 1 and the second main electrode 2 can be a rectangle that is wider at the top and bottom and narrower on the left and right sides.

[0028] Optionally, the two ends of the first main electrode 1 extend out of the first and second electrode surfaces of the first Y capacitor 6 respectively, forming a first extension segment 11 and a second extension segment 12. Similarly, the two ends of the second main electrode 2 extend out of the first and second electrode surfaces of the second Y capacitor 7 respectively, forming a third extension segment 21 and a fourth extension segment 22. A first adapter busbar 4 is connected to the first extension segment 11, and a second adapter busbar 5 is connected to the third extension segment 21. Understandably, the arrangement of the first extension segment 11 and the third extension segment 21 increases the operating space, facilitating the connection of the first adapter busbar 4 and the second adapter busbar 5 to their respective extension segments. The arrangement of the second extension segment 12 and the fourth extension segment 22 facilitates subsequent connections of the first main electrode 1 and the second main electrode 2 to external circuits. The cross-sectional area of ​​the second extension segment 12 can be larger than that of the first extension segment 11, and the cross-sectional area of ​​the fourth extension segment 22 can be larger than that of the third extension segment 21.

[0029] Furthermore, the second extension segment 12 is provided with a first connecting hole 121, and the fourth extension segment 22 is provided with a second connecting hole 221. Understandably, these are mainly used to achieve a fixed connection between the first main electrode 1, the second main electrode 2, and an external circuit, for example, by fastening external wires or devices to the second extension segment 12 and the fourth extension segment 22 using bolts, rivets, or other connectors. This hole-type connection structure ensures the mechanical strength and electrical conductivity of the connection, avoiding poor contact due to vibration, thermal expansion and contraction, etc. At the same time, the standardized hole design improves the versatility and efficiency of assembling the capacitor with external systems, facilitating rapid docking in mass production.

[0030] Furthermore, the first extension section 11 is provided with a third connection hole 111 for connecting the first adapter busbar 4, and the third extension section 21 is provided with a fourth connection hole 211 for connecting the second adapter busbar 5. Understandably, the third connection hole 111 on the first extension section 11 mates with the first adapter busbar 4, and the fourth connection hole 211 on the third extension section 21 mates with the second adapter busbar 5. This allows for a detachable mechanical connection, such as a screw connection, instead of traditional welding. This ensures a stable electrical connection between the first adapter busbar 4 and the first main electrode 1, and between the second adapter busbar 5 and the second main electrode 2, while also facilitating disassembly and replacement during maintenance or debugging.

[0031] Furthermore, the spacing between the second extension segment 12 and the fourth extension segment 22 is smaller than the spacing between the first extension segment 11 and the third extension segment 21. Understandably, the smaller spacing between the second extension segment 12 and the fourth extension segment 22, and the larger spacing between the first extension segment 11 and the third extension segment 21, is based on an optimized design of the current loop and functional layout. The side with the smaller spacing can shorten the loop area at the main electrode output terminal, further reducing parasitic inductance, making it suitable as a connection terminal close to the load; the side with the larger spacing reserves space for arranging other devices, such as the X capacitor between the positive and negative terminals, ensuring a compact structure while meeting the functional requirements of multi-device collaborative operation, achieving a balance between filtering performance and space utilization.

[0032] Optionally, the system also includes a first shielding cover 8 and a second shielding cover 9 for shielding against external electromagnetic interference. The first shielding cover 8 is disposed around the first Y capacitor 6, and the second shielding cover 9 is disposed around the second Y capacitor 7. Understandably, the first shielding cover 8 and the second shielding cover 9 are made of conductive materials such as metal, and are disposed around the first Y capacitor 6 and the second Y capacitor 7 respectively. This effectively blocks electromagnetic interference signals from the external environment from affecting the first main electrode 1, the first Y capacitor 6, the second main electrode 2, and the second Y capacitor 7. Simultaneously, it prevents electromagnetic radiation generated during the operation of the first Y capacitor 6 and the first main electrode 1, as well as the second Y capacitor 7 and the second main electrode 2, from leaking out, thus avoiding interference with surrounding devices. The shielding cover can be electrically connected to the grounding busbar 3 to form a grounding shielding layer, further enhancing the shielding effect. Furthermore, its enclosure structure does not affect the close proximity between the Y capacitor and the main electrode, ensuring that while improving anti-interference capabilities, it maintains the advantages of low inductance and compact design. The first Y capacitor 6 can be partially exposed outside the first shielding cover 8 or completely enclosed inside the first shielding cover 8. The second Y capacitor 7 can be partially exposed outside the second shielding cover 9 or completely enclosed inside the second shielding cover 9.

[0033] Furthermore, there are four first Y capacitors 6, arranged around the periphery of the first main electrode 1; and four second Y capacitors 7, arranged around the periphery of the second main electrode 2. Understandably, the four first Y capacitors 6 are evenly spaced along the outer periphery of the first main electrode 1, and the four second Y capacitors 7 are correspondingly evenly spaced along the outer periphery of the second main electrode 2, ensuring that the spacing between the first Y capacitors 6 and 7 and their corresponding first and second main electrodes 1 and 2 is consistent. This surrounding arrangement makes the current loops of the first Y capacitors 6 and 7 and the first and second main electrodes 1 and 2 more symmetrical, reducing loop differences and improving filtering balance. Simultaneously, it maximizes the use of the space surrounding the first and second main electrodes 1 and 2, eliminating the need for redundant areas. This enhances the low parasitic inductance effect and meets the design requirements of overall compactness and high integration, ensuring stable filtering performance and a reasonable structure.

[0034] Therefore, the capacitor of the present invention, by setting the Y capacitor in parallel and close to the main electrode, significantly shortens the current loop, reduces the loop area, and effectively reduces parasitic inductance; the Y capacitor can be flexibly arranged to increase the filtering capacity, and the compact busbar layout reduces redundant structure, achieving miniaturization and high integration; the addition of a shielding cover enhances anti-interference capability, and the connection structure is stable and reliable, comprehensively improving performance and practicality.

[0035] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0040] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A capacitor, characterized in that, include: First main electrode, second main electrode, grounding busbar, first transition busbar, second transition busbar, first Y capacitor and second Y capacitor; Both the first main electrode and the second main electrode are passed through the grounding busbar. Both the first transition busbar and the second transition busbar are spaced apart on one side of the grounding busbar. At least one first Y capacitor parallel to the first main electrode is provided between the first transition busbar and the grounding busbar. At least one second Y capacitor parallel to the second main electrode is provided between the second transition busbar and the grounding busbar. The first electrode surface and the second electrode surface of the first Y capacitor are connected to the ground busbar and the first transfer busbar in a one-to-one correspondence, and the first transfer busbar is connected to the first main electrode. The first electrode surface and the second electrode surface of the second Y capacitor are connected to the ground busbar and the second transfer busbar in a one-to-one correspondence, and the second transfer busbar is connected to the second main electrode.

2. The capacitor as claimed in claim 1, characterized in that, The grounding busbar is provided with a first through hole for the first main electrode to pass through, a second through hole for the second main electrode to pass through, a first connecting part for connecting the first electrode surface of the first Y capacitor, and a second connecting part for connecting the first electrode surface of the second Y capacitor. The first connecting part and the second connecting part are located on the periphery of the first through hole and the second through hole respectively.

3. The capacitor as described in claim 2, characterized in that, Both the first connecting portion and the second connecting portion are hollowed out.

4. The capacitor as claimed in claim 1, characterized in that, The outer periphery of the first main electrode is provided with at least one first plane, the outer periphery of the second main electrode is provided with at least one second plane, the first Y capacitor is arranged parallel to the first plane, and the second Y capacitor is arranged parallel to the second plane.

5. The capacitor as claimed in claim 1, characterized in that, The two ends of the first main electrode extend out of the first and second electrode surfaces of the first Y capacitor in a corresponding manner to form a first extension segment and a second extension segment. The two ends of the second main electrode extend out of the first and second electrode surfaces of the second Y capacitor in a corresponding manner to form a third extension segment and a fourth extension segment. The first transition busbar is connected to the first extension section, and the second transition busbar is connected to the third extension section.

6. The capacitor as claimed in claim 5, characterized in that, The second extension section is provided with a first connecting hole, and the fourth extension section is provided with a second connecting hole.

7. The capacitor as claimed in claim 5, characterized in that, The first extension section is provided with a third connection hole for connecting the first adapter busbar, and the third extension section is provided with a fourth connection hole for connecting the second adapter busbar.

8. The capacitor as claimed in claim 5, characterized in that, The distance between the second extension segment and the fourth extension segment is less than the distance between the first extension segment and the third extension segment.

9. The capacitor as claimed in claim 1, characterized in that, It also includes a first shielding cover and a second shielding cover for shielding external electromagnetic interference. The first shielding cover is disposed around the first Y capacitor, and the second shielding cover is disposed around the second Y capacitor.

10. The capacitor as claimed in claim 1 or 4, characterized in that, There are four first Y capacitors, which are arranged around the periphery of the first main electrode; there are also four second Y capacitors, which are arranged around the periphery of the second main electrode.

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