High-voltage ceramic dielectric capacitor

Abstract

The utility model discloses a high-voltage ceramic dielectric capacitor, which comprises end electrodes, a dielectric layer and inner electrodes, the end electrodes are arranged on two sides of the dielectric layer, the inner electrodes comprise an inner electrode A and an inner electrode B, the inner electrode A and the inner electrode B are arranged in the dielectric layer, the inner electrode A is not connected with the end electrodes, and one end of the inner electrode B is connected with the end electrodes. According to the utility model, a multi-structure series connection design is adopted, a multi-electrode capacitor series connection structure can be formed between the internal electrodes, and a series connection voltage division principle is utilized, and multi-stage series connection is used for equally dividing high voltage to each electrode dielectric layer, so that the overall voltage resistance performance of the ceramic capacitor is increased in a geometric multiple manner. The end sealing of the traditional end electrode covers the whole end, and the end sealing is only carried out to the middle upper part, so that the conditions of high-voltage lower surface flashover and surface breakdown caused by the fact that the end electrode is too close to the top of the dielectric layer are avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of capacitor preparation, in particular to a high-voltage ceramic capacitor. Background Art

[0002] Ceramic capacitors are widely used in electronic devices, especially in high-voltage environments. Due to the voltage resistance of the internal ceramic dielectric material, traditional small-sized ceramic capacitors, i.e., those below 0603, generally withstand voltages below 100V, which limits their application range. In order to improve the voltage resistance of small-sized ceramic capacitors, their internal electrodes and terminal electrode designs must be optimized.

[0003] Patent document CN202678112U discloses a multi-stage internal series structure capacitor for ultra-high voltage applications. The invention relates to a metallized polypropylene film capacitor comprising an extraction electrode, Mylar tape, a capacitor core sealed within the capacitor, and epoxy resin for sealing both ends of the capacitor. The invention is characterized in that the capacitor core is formed into a cylindrical core body by rolling a metallized polypropylene film using a non-inductive winding machine; the metallized polypropylene film comprises an upper metallized polypropylene film and a bottom metallized polypropylene film; the metallized polypropylene film comprises a conductive metal layer and a film dielectric, the conductive metal layer being separated by an equal distance margin a. The upper and lower metallized polypropylene films are stacked and rolled to form a multi-stage capacitor series connection. However, the extraction electrode terminal structure differs from that of the present application.

[0004] Patent document CN201438422U discloses a high-voltage ceramic capacitor comprising at least two ceramic discs, silver electrodes, lead connectors, a connecting rod, and an insulating enclosure. The ceramic discs are paraelectric ceramic, with silver electrodes positioned at their ends. The connecting rod connects between the silver electrodes on the ceramic discs, and the enclosure surrounds the assembled ceramic discs, silver electrodes, and lead connectors. This patent utilizes multiple ceramic discs connected in series, but the structure differs from the present application. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a high-voltage ceramic capacitor.

[0006] The utility model is achieved through the following technical solutions.

[0007] The utility model provides a high-voltage ceramic capacitor, comprising end electrodes, a dielectric layer and an inner electrode, wherein the end electrodes are arranged on both sides of the dielectric layer, and the inner electrodes include an inner electrode A and an inner electrode B, wherein the inner electrode A and the inner electrode B are arranged in the dielectric layer, the inner electrode A is not connected to the end electrodes, and one end of the inner electrode B is connected to the end electrodes.

[0008] Preferably, the internal electrodes A are arranged in parallel in a plurality of sheets, and the internal electrodes B are respectively arranged on the top and bottom of the plurality of internal electrodes A, and the internal electrode B is not arranged between adjacent internal electrodes A.

[0009] Preferably, two internal electrodes B are provided, wherein one internal electrode B is connected to the end electrode at one end of the dielectric layer, and the other internal electrode B is connected to the end electrode at the other end of the dielectric layer.

[0010] Preferably, the distance between the inner electrode A and the inner electrode B is 20-100 μm, and the inner electrode A and the inner electrode B are parallel.

[0011] Preferably, the closest distance between one surface of the inner electrode B and the edge of the dielectric layer is greater than or equal to 0.1 mm.

[0012] Preferably, a bent portion is provided at one end of the terminal electrode, and the bent portion is connected to the outer wall of the bottom surface of the dielectric layer.

[0013] Preferably, the height of the top of the terminal electrode is smaller than the height of the top of the dielectric layer.

[0014] Preferably, the dielectric layer is arranged with rounded corners.

[0015] The beneficial effects of the present invention are:

[0016] This new design utilizes a multi-structure series connection design, which forms a multi-electrode capacitor structure between internal electrodes. Utilizing the principle of series voltage division, this multi-stage connection evenly distributes the high voltage across each electrode dielectric layer, exponentially increasing the overall withstand voltage performance of the ceramic capacitor. While traditional end capping covers the entire terminal, this new design only caps the upper middle portion, preventing the end electrode from being too close to the top of the dielectric layer, which could lead to surface arcing and breakdown under high voltage.

[0017] The ceramic capacitor of the utility model can achieve a withstand voltage performance of several hundred or even several thousand volts in a small size, and is suitable for small-sized equipment with high withstand voltage. It reduces the size of high withstand voltage equipment and increases the portability of high voltage equipment. It has high economic benefits and strong market competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the utility model;

[0019] Figure 2 This is a schematic diagram of the equivalent capacitor of the utility model;

[0020] In the figure: 1-end electrode, 11-bend portion, 2-dielectric layer, 3-inner electrode, 31-inner electrode A, 32-inner electrode B. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the described solution.

[0022] Example:

[0023] like Figure 1 、 2 As shown, a high-voltage ceramic capacitor includes an end electrode 1, a dielectric layer 2 and an inner electrode 3, wherein the end electrode 1 is arranged on both sides of the dielectric layer 2, and the material of the end electrode 1 includes Cu, Ni, Sn and Pb. The material of the dielectric layer 2 is ceramic, and the inner electrode 3 includes an inner electrode A31 and an inner electrode B32. The inner electrode A31 and the inner electrode B32 are arranged in the dielectric layer 2, and the inner electrode A31 is not connected to the end electrode 1. The distance a between the two ends of the inner electrode A31 and the dielectric layer 2 can be 0.2 mm. One end of the inner electrode B32 is connected to the end electrode 1.

[0024] Several inner electrodes A31 are arranged in parallel, and the inner electrodes B32 are respectively arranged on the top and bottom of the inner electrodes A31. The inner electrode B32 is not arranged between adjacent inner electrodes A31.

[0025] Two internal electrodes B32 are provided, one of which is connected to the end electrode 1 at one end of the dielectric layer 2, and the other is connected to the end electrode 1 at the other end of the dielectric layer 2. The distance b between the end of the internal electrode B32 not connected to the end electrode 1 and the edge of the dielectric layer 2 is 0.2 mm.

[0026] The distance c between the internal electrode A31 and the internal electrode B32 is 20-100 μm, preferably 50 mm, and the internal electrode A31 and the internal electrode B32 are parallel.

[0027] The closest distance d between one surface of the inner electrode B32 and the edge of the dielectric layer 2 is greater than or equal to 0.1 mm, preferably 0.2 mm.

[0028] A bent portion 11 is provided at one end of the terminal electrode 1 , and the bent portion 11 is connected to the outer wall of the bottom surface of the dielectric layer 2 .

[0029] The height of the top of the terminal electrode 1 is 0.2 mm less than the height of the top of the dielectric layer 2 , ie, the distance e.

[0030] The dielectric layer 2 is configured with an R1.5 rounded corner.

[0031] The equivalent capacitance of this capacitor is all connected in series, which can increase the capacitor's high-voltage performance. By optimizing the structure of the internal electrode 3 and the terminal electrode 1, the capacitor's voltage resistance is improved, thus achieving high voltage resistance in a small capacitor size.

Claims

1. A high-voltage ceramic capacitor, characterized in that: The invention comprises an end electrode (1), a dielectric layer (2) and an inner electrode (3), wherein the end electrode (1) is arranged on both sides of the dielectric layer (2), and the inner electrode (3) comprises an inner electrode A (31) and an inner electrode B (32), wherein the inner electrode A (31) and the inner electrode B (32) are arranged in the dielectric layer (2), the inner electrode A (31) is not connected to the end electrode (1), and one end of the inner electrode B (32) is connected to the end electrode (1).

2. A high-voltage ceramic capacitor according to claim 1, characterized in that: The inner electrodes A (31) are arranged in parallel in a plurality of sheets, the inner electrodes B (32) are respectively arranged at the top and bottom of the plurality of sheets of inner electrodes A (31), and the inner electrode B (32) is not arranged between adjacent inner electrodes A (31).

3. A high-voltage ceramic capacitor according to claim 2, characterized in that: Two internal electrodes B (32) are provided, wherein one internal electrode B (32) is connected to the end electrode (1) at one end of the dielectric layer (2), and the other internal electrode B (32) is connected to the end electrode (1) at the other end of the dielectric layer (2).

4. The high-voltage ceramic capacitor according to claim 1, wherein: The distance between the inner electrode A (31) and the inner electrode B (32) is 20-100 μm, and the inner electrode A (31) and the inner electrode B (32) are parallel.

5. The high-voltage ceramic capacitor according to claim 1, wherein: The closest distance between one side of the inner electrode B (32) and the edge of the dielectric layer (2) is greater than or equal to 0.1 mm.

6. The high-voltage ceramic capacitor according to claim 1, wherein: A bent portion (11) is provided at one end of the terminal electrode (1), and the bent portion (11) is connected to the outer wall of the bottom surface of the dielectric layer (2).

7. The high-voltage ceramic capacitor according to claim 1, wherein: The height of the top of the terminal electrode (1) is smaller than the height of the top of the dielectric layer (2).

8. The high-voltage ceramic capacitor according to claim 1, wherein: The dielectric layer (2) is arranged with rounded corners.

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