Filter capacitor
By using a hollow capacitor core structure and heat dissipation channel design, the heat dissipation problem of capacitors under high frequency and high current is solved, achieving efficient heat dissipation and improved voltage withstand performance, thus extending the service life of the capacitor.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SMILER ELECTRONIC IND CO LTD
- Filing Date
- 2025-03-27
- Publication Date
- 2026-04-28
AI Technical Summary
Existing high-voltage capacitors generate Joule heating in high-frequency, high-current applications due to their high ESR, resulting in excessive temperature rise, affecting lifespan, and insufficient heat dissipation performance.
A hollow capacitor core structure is designed, which forms a heat dissipation channel by connecting the central hole of the capacitor with an annular metal sheet, and sets a thickened layer on the metal plating strip to improve conductivity and withstand voltage. A polypropylene base film and copper electrode posts are used to increase the heat dissipation area and conductivity.
This improves the heat dissipation performance and voltage withstand capability of the capacitor, meets the heat dissipation requirements of high-current filtering applications, and extends the service life of the capacitor.
Smart Images
Figure CN224177216U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of capacitor technology, and in particular to a filter capacitor. Background Technology
[0002] In some related technologies, high-voltage capacitors are used for filtering. In high-frequency and high-current applications, these capacitors exhibit high ESR (Equivalent Series Resistance). This high ESR easily generates Joule heating. If this Joule heat accumulates over time, it can cause excessive temperature rise in the capacitor, thus affecting its overall lifespan. Therefore, improving the heat dissipation performance of capacitors is a pressing technical issue that requires research in the industry. Utility Model Content
[0003] The purpose of this invention is to provide a filter capacitor to solve one or more technical problems existing in the prior art, or at least to provide a beneficial option or create conditions.
[0004] The solution to the technical problem of this utility model is: to provide a filter capacitor, including: a first terminal, a second terminal, a first annular metal sheet, a second annular metal sheet and a base film; the base film is provided with a left metal plating strip, a middle metal plating strip and a right metal plating strip from left to right;
[0005] The base film is rolled into a hollow capacitor core. The left side of the hollow capacitor core is connected to a first annular metal sheet so that the left metal plating strip is electrically connected to the first annular metal sheet. The right side of the hollow capacitor core is connected to a second annular metal sheet so that the right metal plating strip is electrically connected to the second annular metal sheet. The first electrode post is connected to the first annular metal sheet, and the second electrode post is connected to the second annular metal sheet.
[0006] The central hole of the hollow capacitor core forms a heat dissipation channel with the central annular holes of the first and second annular metal sheets.
[0007] Furthermore, a first thickened layer is provided on the left-side metal plating strip.
[0008] Furthermore, a second thickened layer is provided on the central metal-plated strip.
[0009] Furthermore, a third thickened layer is provided on the right-side metal plating strip.
[0010] Furthermore, the thickness of the first thickened layer is between 1 and 2 times the thickness of the metal plating layer on the left side.
[0011] Furthermore, the thickness of the second thickened layer is between 1 and 2 times the thickness of the metal plating layer of the central metal plating layer.
[0012] Furthermore, the thickness of the third thickened layer is between 1 and 2 times the thickness of the metal plating layer on the right side.
[0013] Furthermore, the base material of the base film is a polypropylene component.
[0014] Furthermore, the size of the central annular hole of the first annular metal sheet is the same as the size of the central hole of the hollow capacitor core, and the size of the central annular hole of the second annular metal sheet is the same as the size of the central core hole of the hollow capacitor core.
[0015] Furthermore, both the first and second poles are made of copper.
[0016] The beneficial effects of this invention are as follows: Because this capacitor is hollow, the area of its periphery in contact with air is significantly increased compared to capacitors in the prior art. Therefore, this capacitor exhibits better heat dissipation performance than capacitors in the prior art, thus meeting the heat dissipation requirements in high-current filtering applications. This technical solution is primarily applicable to the field of capacitor technology. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly explained below. Obviously, the described drawings are only a part of the embodiments of this utility model, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.
[0018] Figure 1 This is a schematic diagram of the cross-sectional structure of the filter capacitor;
[0019] Figure 2 This is a schematic diagram of the three-dimensional structure of the filter capacitor;
[0020] Figure 3 This is a schematic diagram of the structure of the base film after it has been unfolded.
[0021] Figure 4 This is a schematic diagram of the cross-sectional structure of a single layer of the base film after it is rolled up. Detailed Implementation
[0022] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.
[0023] It should be noted that although functional modules are divided in the system diagram and the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the system or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, and the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.
[0024] refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 .in, Figure 1 This is a schematic diagram of the cross-sectional structure of the filter capacitor; Figure 2 This is a schematic diagram of the three-dimensional structure of the filter capacitor; Figure 3 This is a schematic diagram of the structure of the base film after it has been unfolded. Figure 4 This is a schematic diagram of the cross-sectional structure of a single layer of the base film after it is rolled up.
[0025] This filter capacitor primarily provides a reasonable structure to ensure reliable heat dissipation and improve product reliability.
[0026] To achieve this technical goal, this application provides a filter capacitor comprising: a first terminal 101, a second terminal 102, a first annular metal sheet 110, a second annular metal sheet 120, and a base film.
[0027] The base film is provided with a left metal coating strip 210, a middle metal coating strip 220 and a right metal coating strip 230 from left to right; the base film is formed into a hollow capacitor core by being rolled up.
[0028] The left side of the hollow capacitor core is connected to the first annular metal sheet 110, so that the left metal plating strip 210 is electrically connected to the first annular metal sheet 110. The right side of the hollow capacitor core is connected to the second annular metal sheet 120, so that the right metal plating strip 230 is electrically connected to the second annular metal sheet 120. The first terminal 101 is connected to the first annular metal sheet 110, and the second terminal 102 is connected to the second annular metal sheet 120.
[0029] The first electrode 101 and the second electrode 102 serve as the polarity posts of the capacitor, and their purpose is to connect with the hollow capacitor core formed by the base film.
[0030] To achieve a better and more reliable connection between the hollow capacitor core formed by the base film and the first terminal 101 and the second terminal 102, a first annular metal sheet 110 is provided between the first terminal 101 and the left side of the hollow capacitor core. A second annular metal sheet 120 is provided between the second terminal 102 and the right side of the hollow capacitor core.
[0031] The first annular metal sheet 110 is connected to the left side of the hollow capacitor core through a certain connection process, thereby enabling the first annular metal sheet 110 to be electrically connected to the left metal plating strip 210. The second annular metal sheet 120 is connected to the right side of the hollow capacitor core through a certain connection process, thereby enabling the second annular metal sheet 120 to be electrically connected to the right metal plating strip 230.
[0032] The central hole of the hollow capacitor core forms a heat dissipation channel 300 with the central annular holes of the first annular metal sheet 110 and the second annular metal sheet 120.
[0033] In practical applications, when this capacitor is used for high-current filtering, the hollow capacitor core generates Joule heat due to the equivalent series resistance effect. This Joule heat can be dissipated through the outer periphery of the capacitor. Since the central hole of the hollow capacitor core forms a heat dissipation channel 300 with the central holes of the first annular metal sheet 110 and the second annular metal sheet 120, the Joule heat can also be dissipated externally through this channel 300. From another perspective, the heat dissipation channel 300 gives the capacitor not only external peripheral walls but also internal peripheral walls. This significantly increases the area of the capacitor in contact with air, thereby improving its ability to dissipate Joule heat.
[0034] In this application, because the capacitor is hollow, the peripheral wall in contact with air is significantly increased compared to capacitors in the prior art. Therefore, this capacitor exhibits better heat dissipation performance compared to capacitors in the prior art, thus meeting the heat dissipation requirements in high-current filtering applications.
[0035] On the other hand, in one of the single layers of the hollow capacitor core, the base film can be considered to be composed of at least two capacitors connected in series. The left metal-plated strip 210 and the middle metal-plated strip 220 form one capacitor, and the middle metal-plated strip 220 and the right metal-plated strip 230 form another capacitor. A capacitor core formed by this multi-capacitor series connection can achieve high voltage withstand performance.
[0036] In practical applications, since the metal plating strip of the hollow capacitor core will bear a large current, in some further embodiments, a first thickened layer 211 is provided on the left metal plating strip 210. By providing the first thickened layer 211, the material strength of the left metal plating strip 210 is increased, its conductivity is improved, and its withstand voltage is enhanced. In this specific embodiment, the first thickened layer 211 is located on the left side of the left metal plating strip 210.
[0037] In some further embodiments, a second thickened layer 221 is provided on the central metal-plated strip 220. By providing the second thickened layer 221, the material strength of the central metal-plated strip 220 is increased, its conductivity is improved, and its withstand voltage is enhanced. In this specific embodiment, the second thickened layer 221 is located at the center of the central metal-plated strip 220.
[0038] In some further embodiments, a third thickened layer 231 is provided on the right-side metal-plated strip 230. By providing the third thickened layer 231, the material strength of the right-side metal-plated strip 230 is increased, its conductivity is improved, and its withstand voltage is enhanced. In this specific embodiment, the third thickened layer 231 is located on the right side of the right-side metal-plated strip 230.
[0039] In some further embodiments, the thickness of the first thickened layer 211 is between 1 and 2 times the metal plating thickness of the left-side metal plating layer 210. It should be noted that, in this application, the thickness of the first thickened layer 211 being between 1 and 2 times the metal plating thickness of the left-side metal plating layer 210 includes both cases where the thickness of the first thickened layer 211 is 1 times the metal plating thickness of the left-side metal plating layer 210, and cases where the thickness of the first thickened layer 211 is 2 times the metal plating thickness of the left-side metal plating layer 210.
[0040] In some further embodiments, the thickness of the second thickened layer 221 is between 1 and 2 times the metal plating thickness of the intermediate metal plating layer 220. It should be noted that, in this application, the thickness of the second thickened layer 221 being between 1 and 2 times the metal plating thickness of the intermediate metal plating layer 220 includes: the second thickened layer 221 being 1 times the metal plating thickness of the intermediate metal plating layer 220, and the second thickened layer 221 being 2 times the metal plating thickness of the intermediate metal plating layer.
[0041] In some further embodiments, the thickness of the third thickened layer 231 is between 1 and 2 times the metal plating thickness of the right-side metal plating layer 230. It should be noted that, in this application, the thickness of the third thickened layer 231 being between 1 and 2 times the metal plating thickness of the right-side metal plating layer 230 includes cases where the thickness of the third thickened layer 231 is 1 times the metal plating thickness of the right-side metal plating layer 230, and cases where the thickness of the third thickened layer 231 is 2 times the metal plating thickness of the right-side metal plating layer 230.
[0042] In some further specific embodiments, the base material of the base film is a polypropylene component.
[0043] In order to ensure that the hollow area of the hollow capacitor core has the best heat dissipation and ventilation performance, in some further specific embodiments, the size of the central annular hole of the first annular metal sheet 110 is the same as the size of the central hole of the hollow capacitor core, and the size of the central annular hole of the second annular metal sheet 120 is the same as the size of the core hole of the hollow capacitor core.
[0044] Regarding the material selection of the first terminal 101, in some further specific embodiments, the first terminal 101 is a copper component. Copper components have low resistivity, and setting the first terminal 101 as a copper component can improve the conductivity of the first terminal 101.
[0045] Regarding the material selection of the second electrode 102, in some further specific embodiments, the second electrode 102 is a copper component. Copper components have low resistivity, and setting the second electrode 102 as a copper component can improve the conductivity of the second electrode 102.
[0046] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.
Claims
1. A filter capacitor, characterized in that, include: The first electrode post, the second electrode post, the first annular metal sheet, the second annular metal sheet, and the base film; The base film is provided with a left metal coating strip, a middle metal coating strip and a right metal coating strip from left to right; The base film is rolled into a hollow capacitor core. The left side of the hollow capacitor core is connected to the first annular metal sheet so that the left metal plating strip is electrically connected to the first annular metal sheet. The right side of the hollow capacitor core is connected to the second annular metal sheet so that the right metal plating strip is electrically connected to the second annular metal sheet. The first electrode post is connected to the first annular metal plate, and the second electrode post is connected to the second annular metal plate; The central hole of the hollow capacitor core forms a heat dissipation channel with the central annular holes of the first and second annular metal sheets.
2. A filter capacitor according to claim 1, characterized in that, A first thickened layer is provided on the left side metal plating strip.
3. A filter capacitor according to claim 1, characterized in that, A second thickened layer is provided on the central metal-plated strip.
4. A filter capacitor according to claim 1, characterized in that, A third thickened layer is provided on the metal-plated strip on the right side.
5. A filter capacitor according to claim 2, characterized in that, The thickness of the first thickened layer is between 1 and 2 times the thickness of the metal coating on the left side.
6. A filter capacitor according to claim 3, characterized in that, The thickness of the second thickened layer is between 1 and 2 times the thickness of the metal plating layer of the middle metal plating layer.
7. A filter capacitor according to claim 4, characterized in that, The thickness of the third thickened layer is between 1 and 2 times the thickness of the metal coating on the right side.
8. A filter capacitor according to claim 1, characterized in that, The base material of the base film is a polypropylene component.
9. A filter capacitor according to claim 1, characterized in that, The size of the central annular hole of the first annular metal sheet is the same as the size of the central hole of the hollow capacitor core, and the size of the central annular hole of the second annular metal sheet is the same as the size of the central hole of the hollow capacitor core.
10. A filter capacitor according to claim 1, characterized in that, Both the first and second poles are made of copper.