Voltage-withstanding capacitor

Abstract

The utility model discloses a voltage-withstanding capacitor, which comprises a shell provided with an accommodating cavity with an opening at one end; the capacitor core group is arranged in the accommodating cavity, the capacitor core group comprises at least one capacitor core body, and the periphery of the capacitor core group is wrapped with at least one insulating layer; the leading-out terminal is electrically connected with the capacitor core body and extends out of the shell from the opening; and the potting material is filled in the accommodating cavity so as to realize relative fixation between other components and the shell. According to the technical scheme provided by the embodiment of the utility model, the voltage resistance of the capacitor can be ensured on the basis that the volume and the mass of the capacitor are not increased.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitors, in particular to a withstand voltage capacitor. Background Art

[0002] Capacitors are one of the electronic components used in large quantities in electronic equipment. They are widely used in voltage stabilization, filtering and control circuits. In particular, high-voltage AC capacitors play an important role in many fields and applications.

[0003] Commonly used high-voltage AC capacitors mainly include a shell, a core group, a filler, and a terminal. The core group is placed in the shell, a gap is left between the core group and the shell, the filler is set in the gap for packaging, and the terminal is used for external wiring. However, when assembling the above-mentioned high-voltage AC capacitor, since the core group is first placed in the shell and then the filler is injected, the core group cannot be guaranteed to be completely centered in the shell, and the thickness of the filler between the core group and the shell cannot be guaranteed, which leads to the capacitor being unable to meet the withstand voltage requirements. If the thickness of the filler is increased, the volume and mass of the capacitor will also increase further. Therefore, how to ensure the withstand voltage of the capacitor without increasing the volume and mass of the capacitor has become a technical problem that needs to be solved urgently. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the above-mentioned technology at least to a certain extent. To this end, the purpose of the utility model is to provide a withstand voltage capacitor to ensure the withstand voltage of the capacitor without increasing the volume and mass of the capacitor.

[0005] To achieve the above-mentioned purpose, the embodiment of the utility model provides a withstand voltage capacitor, comprising:

[0006] A housing having a receiving cavity with an opening at one end;

[0007] A capacitor core group is arranged in the accommodating cavity, the capacitor core group includes at least one capacitor core body, and the periphery of the capacitor core group is wrapped with at least one insulating layer;

[0008] A lead-out terminal is electrically connected to the capacitor core and extends out of the housing from the opening;

[0009] A potting material is filled in the accommodating cavity to achieve relative fixation between other components and the shell.

[0010] According to the withstand voltage capacitor of the embodiment of the utility model, the capacitor core group is arranged in the accommodating cavity, and the periphery of the capacitor core group is wrapped with at least one insulating layer. Therefore, even if the capacitor core group is not completely centered in the shell and the thickness of the potting material between the capacitor core group and the shell is relatively thin, the withstand voltage of the capacitor can be guaranteed without increasing the volume and mass of the capacitor.

[0011] In addition, the withstand voltage capacitor according to the above embodiment of the utility model may also have the following additional technical features:

[0012] Optionally, the number of the capacitor cores is one or three. When the number of the capacitor cores is three, the three capacitor cores are connected in a triangle or star shape.

[0013] Optionally, each of the capacitor cores includes at least one core group connected in series.

[0014] Optionally, each of the core groups includes a plurality of cores connected in parallel, and each of the cores includes a plurality of strings connected in series.

[0015] Optionally, when the number of the capacitor core is one, the number of the lead terminals is two, and the two lead terminals are electrically connected to one end of the capacitor core respectively;

[0016] When the number of the capacitor cores is three and the three capacitor cores are connected in a triangle, the number of the lead terminals is three, and each of the lead terminals is electrically connected to adjacent ends of two adjacent capacitor cores in the triangle connection;

[0017] When the number of the capacitor cores is three and the three capacitor cores are star-connected, the number of the lead terminals is four, one of the four lead terminals is electrically connected to the common end between the three capacitor cores, and the remaining lead terminals are electrically connected to the other ends of the three capacitor cores respectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The structure diagram of a withstand voltage capacitor according to one embodiment of the utility model (partial cross-section);

[0019] Figure 2 A circuit diagram of a capacitor core group including a capacitor core according to an embodiment of the utility model;

[0020] Figure 3 A schematic structural diagram of a withstand voltage capacitor according to another embodiment of the utility model;

[0021] Figure 4 for Figure 3 Circuit diagram of

[0022] Figure 5 A schematic structural diagram of a withstand voltage capacitor according to another embodiment of the utility model;

[0023] Figure 6 for Figure 5 Schematic diagram of the circuit.

[0024] Description of reference numerals: housing 100 , capacitor core assembly 200 , lead terminal 300 , potting material 400 , capacitor core body 210 . DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0026] In order to better understand the above technical solution, 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 accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0027] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0028] Please refer to Figure 1 The embodiment of the utility model provides a withstand voltage capacitor, which includes a housing 100, a capacitor core group 200, a lead terminal 300 and a potting material 400. Specifically,

[0029] The housing 100 may be in any shape, such as a square, a cylinder, or a prism, etc. The housing 100 has a receiving cavity, and the receiving cavity has an opening, and the opening can allow other components to pass through and be placed inside the housing 100 .

[0030] The capacitor core group 200 is arranged in the accommodating cavity, and the capacitor core group 200 includes at least one capacitor core 210. It should be noted that the at least one mentioned in the present application can be one, or two or more than two, without any special limitation. The outer periphery of the capacitor core group 200 is wrapped with at least one insulating layer, which is made of high-voltage resistant material and has certain strength and toughness. The surface of the insulating layer needs to have a certain bonding with the potting material 400. In one example, the insulating layer can be insulating paper or insulating film.

[0031] The lead terminal 300 is electrically connected to the capacitor core 210 and extends from the opening to the outside of the housing 100 for external wiring. In one example, the portion of the lead terminal 300 protruding from the surface of the potting material 400 is provided with an insulating portion, which can be a multi-layer umbrella-shaped structure to increase the creepage distance of the capacitor and improve the safety performance of the capacitor. It should be noted that the number of the lead terminals 300 can be two or more, which corresponds to the number of the capacitor core 210 and the wiring method.

[0032] The potting material 400 is filled in the accommodating cavity, so that other components (capacitor core group 200, lead terminal 300, etc.) can be relatively fixed to the housing 100. In one embodiment, after the potting material 400 is filled and solidified, the outside of the housing 100 can be packaged to achieve a sealing effect, prevent water vapor from entering the interior of the capacitor, and improve the safety performance of the capacitor.

[0033] When the capacitor core group 200 and the insulating layer are loaded into the accommodating cavity together or when the potting material 400 is injected, the position between the capacitor core group 200 and the housing 100 is offset, resulting in uneven material thickness, the insulating layer can play the role of insulation between the housing 100 and the capacitor core group 200, and ensure the pressure resistance of the capacitor without increasing the volume and mass of the capacitor. In addition, the insulating layer and the potting material 400 have a certain degree of bonding and have a certain strength and toughness, which can also prevent the potting material 400 from cracking during the use of the capacitor, thereby improving the safety performance of the capacitor.

[0034] Please refer to Figure 1-Figure 6 In one embodiment of the present invention, the number of the capacitor cores 210 may be one or three. When the number of the capacitor cores 210 is three, the three capacitor cores 210 may be connected in a triangle (e.g. Figure 4 as shown) or star connection (as shown Figure 6 It should be noted that those skilled in the art can select a corresponding connection method according to actual implementation requirements, and there is no special limitation on this.

[0035] In one embodiment, when the number of the capacitor core 210 is one, the number of the lead terminals 300 is two, and the two lead terminals 300 are electrically connected to one end of the capacitor core 210 respectively.

[0036] When there are three capacitor cores 210 and the three capacitor cores 210 are connected in a triangle, there are three lead-out terminals 300 , and each lead-out terminal 300 is electrically connected to adjacent ends of two adjacent capacitor cores 210 in the triangle connection.

[0037] When the number of capacitor cores 210 is three and the three capacitor cores 210 are star-connected, the number of lead terminals 300 is four, one of the four lead terminals 300 is electrically connected to the common end between the three capacitor cores 210, and the remaining lead terminals 300 are respectively electrically connected to the other end of the three capacitor cores 210 (i.e., the other end except the common end).

[0038] In one embodiment of the utility model, each capacitor core 210 includes at least one core group connected in series. It should be understood that multiple core groups are connected in series, and the sum of the voltages across each core group is equal to the total voltage across the core group, thereby achieving voltage sharing, while ensuring the performance of the capacitor and improving the voltage resistance of the capacitor.

[0039] In one example, each core group includes a plurality of cores connected in parallel, and each core includes a plurality of strings connected in series, which are formed by winding a plurality of strings of metallized films.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0042] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0043] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A withstand voltage capacitor, characterized in that: include: A housing having a receiving cavity with an opening at one end; A capacitor core group is arranged in the accommodating cavity, the capacitor core group includes at least one capacitor core body, and the periphery of the capacitor core group is wrapped with at least one insulating layer; A lead-out terminal is electrically connected to the capacitor core and extends out of the housing from the opening; A potting material is filled in the accommodating cavity to achieve relative fixation between other components and the shell.

2. The capacitor according to claim 1, characterized in that The number of the capacitor cores is one or three. When the number of the capacitor cores is three, the three capacitor cores are connected in a triangle or star shape.

3. The capacitor according to claim 2, characterized in that Each of the capacitor cores includes at least one core group connected in series.

4. The capacitor according to claim 3, characterized in that Each of the core groups includes a plurality of cores connected in parallel, and each of the cores includes a plurality of strings connected in series.

5. The capacitor according to claim 2, characterized in that When the number of the capacitor core is one, the number of the lead terminals is two, and the two lead terminals are electrically connected to one end of the capacitor core respectively; When the number of the capacitor cores is three and the three capacitor cores are connected in a triangle, the number of the lead terminals is three, and each of the lead terminals is electrically connected to adjacent ends of two adjacent capacitor cores in the triangle connection; When the number of the capacitor cores is three and the three capacitor cores are star-connected, the number of the lead terminals is four, one of the four lead terminals is electrically connected to the common end between the three capacitor cores, and the remaining lead terminals are electrically connected to the other ends of the three capacitor cores respectively.

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