Ceramic capacitor double-shielding structure

Abstract

The invention discloses a ceramic capacitor double-shielding structure, and the structure comprises a central shielding net which is of a tubular structure; the high-voltage parallel wires are wound on the outer wall of the central shielding net and are connected with the central shielding net; the high-voltage sides of the ceramic capacitors are respectively connected with the high-voltage parallel leads; the low-voltage parallel wires are wound on the plurality of ceramic capacitors and are respectively connected with the low-voltage sides of the plurality of ceramic capacitors; the high-voltage shielding net is respectively connected with the high-voltage sides of the plurality of ceramic capacitors and covers the high-voltage sides of the plurality of ceramic capacitors at the same time; and the low-voltage shielding net is respectively connected with the low-voltage sides of the plurality of ceramic capacitors and covers the low-voltage sides of the plurality of ceramic capacitors at the same time. By arranging the central shielding net, the high-voltage shielding net and the low-voltage shielding net, electric fields on the high-voltage side and the low-voltage side of the ceramic capacitor can be effectively shielded, and electric field distribution on the high-voltage side and the low-voltage side of the ceramic capacitor is effectively uniformized.

Description

Technical Field

[0001] The present application relates to the technical field of electronic components, and in particular to a double-shielding structure of a ceramic capacitor. Background Art

[0002] In the field of primary and secondary fusion electrical, ceramic capacitors are a very important part for measurement and energy extraction. In order to increase the external insulation of ceramic capacitors, ceramic capacitors are sealed in epoxy parts to form a module or product.

[0003] In order to prevent the ceramic capacitor from being disturbed during measurement or energy extraction, some shielding structural components are set on the ceramic capacitor. When the shielding structural components are formed, most of the existing multiple measuring or energy extraction ceramic capacitor elements are directly connected to the high-voltage conductor, and their shrinkage stress is relatively large. During the epoxy curing process (VC vacuum casting module, APG injection molding), microcracks, gaps and other defects are generated on the electrode surfaces at both ends of multiple measuring or energy extraction ceramic capacitor elements, which brings about problems such as surface breakdown and partial discharge of the measuring or energy extraction ceramic capacitor elements, thereby affecting the electrical insulation performance of the epoxy parts. Summary of the invention

[0004] The purpose of the embodiment of the present application is to provide a ceramic capacitor double shielding structure, including:

[0005] The central shielding net is a tubular structure;

[0006] A high voltage parallel conductor, which is wrapped around the outer wall of the central shielding net and connected to the central shielding net;

[0007] A plurality of ceramic capacitors, the high voltage sides of which are respectively connected to the high voltage parallel wires;

[0008] A low-voltage parallel wire, which surrounds the plurality of ceramic capacitors and is respectively connected to the low-voltage sides of the plurality of ceramic capacitors;

[0009] A high-voltage shielding net, which is respectively connected to the high-voltage sides of the plurality of ceramic capacitors and covers the high-voltage sides of the plurality of ceramic capacitors at the same time;

[0010] The low-voltage shielding net is respectively connected to the low-voltage sides of the plurality of ceramic capacitors and covers the low-voltage sides of the plurality of ceramic capacitors at the same time.

[0011] As an optional embodiment, the plurality of ceramic capacitors are divided into a plurality of groups, and the ceramic capacitors in each group are distributed circumferentially along the center line of the central shielding mesh.

[0012] As an optional embodiment, the ceramic capacitors in two adjacent groups are staggered along the axial direction of the central shielding mesh.

[0013] As an optional embodiment, the edges of the upper and lower ends of the central shielding net are respectively rolled inwardly of the central shielding net to form a first rolled edge.

[0014] As an optional embodiment, one end of the high-voltage shielding net is connected to one end surface of the ceramic capacitor, and the other end thereof extends toward the outer peripheral surface of the ceramic capacitor and is rolled up at the end in a direction away from the low-voltage shielding net to form a second curled edge.

[0015] As an optional embodiment, one end of the low-voltage shielding net is connected to the other end face of the ceramic capacitor, and the other end thereof extends toward the outer peripheral surface of the ceramic capacitor and is rolled up at the end in a direction away from the high-voltage shielding net to form a third curled edge.

[0016] As an optional embodiment, the distance between the edge of the second curl and the outer peripheral wall of the ceramic capacitor is greater than 1 mm, the distance between the edge of the third curl and the outer peripheral wall of the ceramic capacitor is greater than 1 mm, and the distance between the second curl and the third curl is greater than 5 mm.

[0017] As an optional embodiment, a portion of the low-voltage parallel wire located between two adjacent ceramic capacitors has an arched structure.

[0018] As an optional embodiment, the ceramic capacitor double shielding structure further includes a secondary signal output line, which is connected to the low-voltage parallel wire for outputting a signal.

[0019] As an optional embodiment, an insulating layer is provided on the outer peripheral wall of the secondary signal output line.

[0020] The beneficial effects of the embodiments of the present application are:

[0021] The present application can effectively shield the electric field on the high-voltage and low-voltage sides of the ceramic capacitor by setting a central shielding net, a high-voltage shielding net and a low-voltage shielding net, effectively and evenly distribute the electric field on the high-voltage and low-voltage sides of the ceramic capacitor, solve the defects such as microcracks and gaps on the electrode surfaces at both ends of the ceramic capacitor, introduce the high-intensity points of the electric field of the high-voltage and low-voltage electrodes of the ceramic capacitor into the epoxy, thereby reducing problems such as surface breakdown and partial discharge of the ceramic capacitor, reducing the internal stress of curing in the VC vacuum casting module and APG injection molding process, and optimizing the electric field. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of a double-shielding structure of a ceramic capacitor according to an embodiment of the present application;

[0023] Figure 2 A cross-sectional view of the connection between a ceramic capacitor and a high / low voltage shielding mesh according to an embodiment of the present application;

[0024] Figure 3 This is a schematic structural diagram of a high-voltage shielding net according to an embodiment of the present application;

[0025] Figure 4 A cross-sectional view of a high-voltage shielding net according to an embodiment of the present application;

[0026] Figure 5 This is a schematic structural diagram of the central shielding network of an embodiment of the present application.

[0027] in,

[0028] 1. Center shielding net; 11. First curling; 2. High-voltage parallel wire; 3. Ceramic capacitor; 4. Low-voltage parallel wire; 5. High-voltage shielding net; 51. Second curling; 6. Low-voltage shielding net; 61. Third curling; 7. Secondary signal output line. DETAILED DESCRIPTION

[0029] Various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0030] It should be understood that various modifications may be made to the embodiments of the present application. Therefore, the above description should not be considered as limiting, but only as an example of an embodiment. Other modifications within the scope and spirit of the present application will occur to those skilled in the art.

[0031] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present application and, together with the general description of the present application given above and the detailed description of the embodiments given below, serve to explain the principles of the present application.

[0032] These and other characteristics of the present application will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0033] It should also be understood that although the present application has been described with reference to some specific examples, those skilled in the art will be able to readily implement many other equivalent forms of the present application.

[0034] The above and other aspects, features and advantages of the present application will become more apparent in view of the following detailed description when taken in conjunction with the accompanying drawings.

[0035] Specific embodiments of the present application are described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments applied for are merely examples of the present application, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that obscure the present application. Therefore, the specific structural and functional details applied for herein are not intended to be limiting, but merely serve as a basis and representative basis for the claims to teach those skilled in the art to use the present application in a variety of ways with substantially any suitable detailed structure.

[0036] This specification may use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," all of which may refer to one or more of the same or different embodiments according to the present application.

[0037] The double shielding structure of a ceramic capacitor in the embodiment of the present application is suitable for VC vacuum casting modules and APG injection molded epoxy parts. Figure 1 As shown, the double shielding structure of the ceramic capacitor includes a central shielding net 1, a high-voltage parallel conductor 2, a ceramic capacitor 3, a low-voltage parallel conductor 4, a high-voltage shielding net 5 and a low-voltage shielding net 6.

[0038] like Figure 5 As shown, the central shielding net 1 is a tubular structure, wherein a plurality of evenly distributed rhombus-shaped openings are provided on the tubular structure. The high-voltage parallel conductor 2 surrounds the outer wall of the central shielding net 1 and is connected to the central shielding net 1. The high-voltage parallel conductor 2 is a ring structure.

[0039] The high-voltage sides of the plurality of ceramic capacitors 3 are respectively connected to the high-voltage parallel wires 2 , wherein the plurality of ceramic capacitors 3 are used for measuring or extracting energy, and the ceramic capacitors 3 are connected to the high-voltage parallel wires 2 by welding or crimping.

[0040] The low voltage parallel wire 4 surrounds the plurality of ceramic capacitors 3 and is respectively connected to the low voltage sides of the plurality of ceramic capacitors 3. The low voltage parallel wire 4 is a ring structure, and the ceramic capacitor 3 and the low voltage parallel wire 4 are connected by welding or crimping.

[0041] The high-voltage shielding net 5 is respectively connected to the high-voltage sides of the plurality of ceramic capacitors 3, and simultaneously covers the high-voltage sides of the plurality of ceramic capacitors 3. The high-voltage shielding net 5 is a bowl-shaped structure, and the bowl-shaped structure is provided with a plurality of evenly distributed diamond-shaped openings. The high-voltage shielding net 5 is connected to the high-voltage side of the ceramic capacitor 3 by welding or crimping.

[0042] The low-voltage shielding net 6 is respectively connected to the low-voltage sides of the plurality of ceramic capacitors 3, and simultaneously covers the low-voltage sides of the plurality of ceramic capacitors 3. The low-voltage shielding net 6 is a bowl-shaped structure, and the bowl-shaped structure is provided with a plurality of evenly distributed rhombus-shaped openings. The low-voltage shielding net 6 is connected to the low-voltage side of the ceramic capacitor 3 by welding or crimping.

[0043] In this embodiment, the plurality of ceramic capacitors 3 are measuring or energy extraction elements, which can realize functions such as measurement and energy extraction. For example, in the measurement module of a smart meter, the plurality of ceramic capacitors 3 can accurately measure parameters such as current and voltage through different combinations.

[0044] The high-voltage parallel conductor 2 is used to connect the high-voltage sides of multiple ceramic capacitors 3 with the conductors of the central shielding network 1, connecting the high-voltage ends of each ceramic capacitor 3 together so that they can work together to extract energy. The low-voltage parallel conductor 4 connects the conductors of the low-voltage sides of multiple ceramic capacitors 3, connecting the low-voltage ends of the ceramic capacitors 3 to ensure the electrical connection of the low-voltage side.

[0045] The high-voltage shielding net 5 is connected to the high-voltage side of the plurality of ceramic capacitors 3 and covers the components on the high-voltage side thereof, and can shield the electric field on the high-voltage side of the ceramic capacitors 3. The low-voltage shielding net 6 is connected to the low-voltage side of the plurality of ceramic capacitors 3 and covers the components on the low-voltage side thereof, and plays a shielding and protective role on the low-voltage side.

[0046] When the present application is used, when the double shielding structure of the ceramic capacitor is working, multiple ceramic capacitors 3 start to measure or extract energy, and the electric energy on the high-voltage side is transmitted to each ceramic capacitor 3 through the high-voltage parallel wire 2. The central shielding net 1 shields the internal electric field to reduce external interference. The high-voltage shielding net 5 shields the electric field on the high-voltage side to prevent leakage; the low-voltage shielding net 6 shields the electric field on the low-voltage side to ensure the stability of the low-voltage side. The low-voltage parallel wire 4 connects the low-voltage side of multiple ceramic capacitors 3 to maintain the electrical connection on the low-voltage side.

[0047] The present application reduces the measurement error caused by external electric field interference of the ceramic capacitor 3 by setting the central shielding net 1, the high-voltage shielding net 5 and the low-voltage shielding net 6, and improves the accuracy of measurement or energy extraction. At the same time, the parallel connection mode of multiple ceramic capacitors 3 enhances the stability and reliability of the structure.

[0048] The central shielding net 1, high-voltage shielding net 5 and low-voltage shielding net 6 of the present application are all made of mesh metal material, because their rigidity is relatively small, which is conducive to the shrinkage of epoxy parts. The high-voltage shielding net 5 and the low-voltage shielding net 6 are symmetrical bowl-shaped structures, which are easy to connect with the electrode and make the electric field more uniform.

[0049] like Figure 1 As shown, in one embodiment, the plurality of ceramic capacitors 3 are divided into a plurality of groups, and each group of ceramic capacitors 3 is distributed in a ring shape around the center line of the central shielding net 1 . That is, each group of ceramic capacitors 3 is distributed around the outer periphery of the central shielding net 1 .

[0050] In this embodiment, the plurality of ceramic capacitors 3 are arranged in a circular shape around the center line of the central shielding net 1. For example, with the central shielding net 1 as the axis, the plurality of ceramic capacitors 3 are evenly distributed on the circumference around it.

[0051] The grouped ceramic capacitors 3 perform measurements or extract energy at their respective circumferential positions around the central shielding mesh 1 , and capacitors in different groups work together to further improve the efficiency and accuracy of the measurement or energy extraction.

[0052] The present application makes the distribution of the ceramic capacitors 3 more reasonable, improves the space utilization, and different groups of capacitors can measure different areas or parameters at the same time, improving the comprehensiveness and accuracy of the measurement.

[0053] like Figure 1 As shown, in one embodiment, the ceramic capacitors 3 of two adjacent groups are staggered along the axial direction of the central shielding mesh 1 .

[0054] In this embodiment, two adjacent groups of ceramic capacitors 3 are staggered in the axial direction of the central shielding net 1 and are not in the same plane. For example, one group of ceramic capacitors 3 is located at the upper part of the central shielding net 1, and the other group is located at a slightly lower position, and the two groups are also staggered in the circumferential direction.

[0055] The staggered ceramic capacitors 3 can avoid signal interference between each other, making the measurement or energy extraction process more stable. When measuring or extracting energy, different groups of capacitors work at different positions, reducing mutual influence. The present application further reduces mutual interference between the ceramic capacitors 3, and improves the stability and accuracy of measurement or energy extraction.

[0056] like Figure 5 As shown, in one embodiment, the edges of the upper and lower ends of the central shielding net 1 are respectively rolled inward of the central shielding net 1 to form a first rolled edge 11 .

[0057] In this embodiment, the upper and lower edges of the central shielding net 1 are rolled inward like a roll of paper, forming an inward curling structure. The first curling edge 11 can reduce the field strength at the end of the central shielding net 1, avoid problems caused by field strength concentration, and at the same time shield the conductor interface defects caused by capacitance shrinkage differences. When the structure is working, the curling edge can effectively disperse the electric field and protect the central shielding net 1 and surrounding components.

[0058] The present application enhances the shielding effect of the central shielding net 1, improves the safety and stability of the structure, and reduces the risk of failure caused by field strength concentration.

[0059] like Figure 2-Figure 4 As shown, in one embodiment, one end of the high-voltage shielding net 5 is connected to one end surface of the ceramic capacitor 3, and the other end thereof extends toward the outer peripheral surface of the ceramic capacitor 3 and is rolled up at the end in a direction away from the low-voltage shielding net 6 to form a second curling edge 51.

[0060] In this embodiment, the high-voltage shielding net 5 is like a bowl, and the edge of the bowl is rolled outward, and this rolled portion is the second curling edge 51. The second curling edge 51 can further optimize the shielding effect of the high-voltage shielding net 5, and at the same time maintain a suitable distance from the ceramic capacitor 3 to avoid affecting the shielding effect and electrical performance due to being too close or too far away. When working, it can better guide and shield the high-voltage side electric field.

[0061] The present application improves the shielding performance of the high-voltage shielding net 5, optimizes the electric field distribution, and ensures the electrical performance of the double-shielding structure of the ceramic capacitor.

[0062] like Figure 2 As shown, in one embodiment, one end of the low-voltage shielding net 6 is connected to the other end face of the ceramic capacitor 3, and the other end thereof extends toward the outer peripheral surface of the ceramic capacitor 3 and is rolled up at the end in a direction away from the high-voltage shielding net 5 to form a third curling edge 61.

[0063] In this embodiment, the low-voltage shielding net 6 is like a bowl, and the edge of the bowl is rolled outward, and this rolled portion is the third curling edge 61. The third curling edge 61 optimizes the shielding effect of the low-voltage shielding net 6, maintains a suitable distance from the ceramic capacitor 3, and stabilizes the low-voltage side electric field. When working, it can effectively shield the low-voltage side electric field and prevent external interference.

[0064] The present application improves the shielding effect of the low-voltage shielding net 6, stabilizes the electric field on the low-voltage side, and enhances the stability of the entire structure.

[0065] In one embodiment, the distance between the edge of the second curl 51 and the outer peripheral wall of the ceramic capacitor 3 is greater than 1 mm, the distance between the edge of the third curl 61 and the outer peripheral wall of the ceramic capacitor 3 is greater than 1 mm, and the distance between the second curl 51 and the third curl 61 is greater than 5 mm.

[0066] In this embodiment, the distances between the edge of the second curl 51 and the outer peripheral wall of the ceramic capacitor 3, the edge of the third curl 61 and the outer peripheral wall of the ceramic capacitor 3, and the second curl 51 and the third curl 61 are limited. The distance between the second curl 51 and the third curl 61 is set along the axial direction of the ceramic capacitor 3.

[0067] The appropriate spacing can ensure uniform distribution of the electric field, avoid electric field concentration due to too small a distance, and avoid affecting the shielding effect due to too large a distance. When the structure is working, the stable electric field distribution ensures the normal operation of the ceramic capacitor 3.

[0068] The present application optimizes the electric field distribution, improves the electrical performance and stability of the double-shielded structure of ceramic capacitors, and reduces failures caused by electric field problems.

[0069] like Figure 1 and Figure 2 As shown, in one embodiment, a portion of the low-voltage parallel conductor 4 located between two adjacent ceramic capacitors 3 has an arched structure.

[0070] In this embodiment, the low-voltage parallel conductor 4 with an arched structure can effectively even out the electric field, so that the current is more evenly distributed among the plurality of ceramic capacitors 3. During operation, the current is more evenly distributed to each ceramic capacitor 3 through the conductor of the arched portion.

[0071] The present application evens out the electric field distribution, improves the working efficiency and stability of the ceramic capacitor 3, and ensures the accuracy of measurement or energy extraction.

[0072] like Figure 1 As shown, in one embodiment, the ceramic capacitor double shielding structure further includes a secondary signal output line 7, and the secondary signal output line 7 is connected to the low voltage parallel wire 4 for outputting a signal.

[0073] In this embodiment, the secondary signal output line 7 is a conductor for outputting a signal generated after measurement or energy extraction. The signal obtained by the ceramic capacitor 3 through measurement or energy extraction is transmitted to the secondary signal output line 7 through the low-voltage parallel wire 4, and then the secondary signal output line 7 transmits the signal to other devices for processing and analysis.

[0074] The present application realizes signal transmission, so that the results of measuring or extracting energy of the ceramic capacitor 3 can be used by subsequent equipment, and expands the application scope of the double-shielded structure of the ceramic capacitor.

[0075] In one embodiment, an insulating layer is provided on the outer peripheral wall of the secondary signal output line 7. The insulating layer is wrapped on the outer peripheral wall of the secondary signal output line 7 and is a layer of material that plays an insulating role. For example, a wrapping layer made of common rubber, plastic and other materials is an insulating layer to prevent the secondary signal output line 7 from leaking electricity.

[0076] The insulating layer prevents leakage between the secondary signal output line 7 and surrounding components, ensuring the stability of signal transmission. During signal transmission, the insulating layer isolates external interference and leakage risks. The present application improves the safety and stability of signal transmission and reduces signal distortion and equipment failures caused by leakage and interference.

[0077] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A ceramic capacitor double shielding structure, characterized in that: include: The central shielding net is a tubular structure; A high voltage parallel conductor, which is wrapped around the outer wall of the central shielding net and connected to the central shielding net; A plurality of ceramic capacitors, the high-voltage sides of which are respectively connected to the high-voltage parallel wires; A low-voltage parallel wire, which surrounds the plurality of ceramic capacitors and is respectively connected to the low-voltage sides of the plurality of ceramic capacitors; A high-voltage shielding net, which is respectively connected to the high-voltage sides of the plurality of ceramic capacitors and covers the high-voltage sides of the plurality of ceramic capacitors at the same time; The low-voltage shielding net is respectively connected to the low-voltage sides of the plurality of ceramic capacitors and covers the low-voltage sides of the plurality of ceramic capacitors at the same time.

2. The double shielding structure of ceramic capacitor according to claim 1, characterized in that: The plurality of ceramic capacitors are divided into a plurality of groups, and the ceramic capacitors in each group are distributed circumferentially along the center line of the central shielding mesh.

3. The double shielding structure of ceramic capacitor according to claim 2, characterized in that: The ceramic capacitors of two adjacent groups are staggeredly arranged along the axial direction of the central shielding network.

4. The double shielding structure of ceramic capacitor according to claim 1, characterized in that: The edges of the upper and lower ends of the central shielding net are respectively rolled inwardly of the central shielding net to form a first rolled edge.

5. The double shielding structure of ceramic capacitor according to claim 1, characterized in that: One end of the high-voltage shielding net is connected to one end surface of the ceramic capacitor, and the other end thereof extends toward the outer peripheral surface of the ceramic capacitor and is rolled up at the end in a direction away from the low-voltage shielding net to form a second curling edge.

6. The double shielding structure of ceramic capacitor according to claim 5, characterized in that: One end of the low voltage shielding net is connected to the other end surface of the ceramic capacitor, and the other end thereof extends toward the outer peripheral surface of the ceramic capacitor and is rolled up at the end in a direction away from the high voltage shielding net to form a third curling edge.

7. The double shielding structure of ceramic capacitor according to claim 6, characterized in that: The distance between the edge of the second curl and the outer peripheral wall of the ceramic capacitor is greater than 1 mm, the distance between the edge of the third curl and the outer peripheral wall of the ceramic capacitor is greater than 1 mm, and the distance between the second curl and the third curl is greater than 5 mm.

8. The double shielding structure of ceramic capacitor according to claim 1, characterized in that: The portion of the low-voltage parallel wire located between two adjacent ceramic capacitors has an arched structure.

9. The double shielding structure of ceramic capacitor according to claim 1, characterized in that: The ceramic capacitor double shielding structure also includes a secondary signal output line, which is connected to the low-voltage parallel wire for outputting signals.

10. The double shielding structure of ceramic capacitor according to claim 9, characterized in that: An insulating layer is provided on the outer peripheral wall of the secondary signal output line.

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