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Tubular high-voltage ceramic capacitor with umbrella skirt structures

A high-voltage ceramic and capacitor technology, applied in the field of capacitors, can solve the problems of capacitor failure, limited capacitance, short creepage distance, etc., to improve the withstand voltage performance and reliability, reduce the probability of breakdown, and increase the capacitance value of the capacitor.

Inactive Publication Date: 2018-02-09
北京智罗盘智能电气有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional disc-shaped high-voltage ceramic capacitors can no longer meet this development demand, mainly due to the following two shortcomings: First, the distance along the surface of disc-shaped high-voltage ceramic capacitors is short, the electric field at the edge of the electrode is concentrated, and most of the failures during use are The failure of the capacitor is due to the breakdown of the electrode edge, which seriously restricts the performance of the high-voltage ceramic capacitor; the second is that the disc-shaped high-voltage ceramic capacitor has a small capacity. Take the relatively mature N4700 ceramic material as an example (dielectric constant is 2000). The maximum capacitance of the 10kVac voltage level is only 2nF, and the corresponding tile size is 60mm in diameter and 15mm in thickness
The main reason why the capacity of disc-shaped high-voltage ceramic capacitors is difficult to further increase is that with the increase of its capacity and size, it is more and more difficult to sinter the ceramic discs used, and uneven internal and external sintering is prone to occur during the sintering process: the surface has been sintered Completed, the interior of the ceramic chip has not been sintered and dense, which greatly reduces the performance of the ceramic chip, and in severe cases leads to cracking of the ceramic chip, which restricts the further improvement of the capacitance

Method used

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  • Tubular high-voltage ceramic capacitor with umbrella skirt structures
  • Tubular high-voltage ceramic capacitor with umbrella skirt structures
  • Tubular high-voltage ceramic capacitor with umbrella skirt structures

Examples

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Embodiment 1

[0022] The structure of a tubular high-voltage ceramic capacitor 10 with an umbrella shed structure in this embodiment is as follows figure 1 As shown, it includes a high dielectric constant ceramic tube 1, which is prepared by pressing N4700 ceramic material with a dielectric constant of 2000 and high-temperature sintering process. The inner diameter of the ceramic tube is 30mm, the outer diameter is 60mm, and the height is 40mm; on the ceramic tube, The lower two ends are pressed once or reprocessed after forming (the specific processing method is a conventional process in this field) and the shed structure 4-1 is symmetrically provided. The shed structure is a circle of arc-shaped grooves, and the depth of the groove is 2mm The inner and outer surfaces of the ceramic tube are respectively wrapped with inner and outer silver electrode layers 2-1 and 2-2 (the thickness of the inner and outer silver electrode layers in this embodiment is 1-10 μm), and the electrode layer is for...

Embodiment 2

[0028] The structure of a tubular high-voltage ceramic capacitor 20 with an umbrella shed structure in this embodiment is as follows figure 2 As shown, this embodiment is roughly the same as Embodiment 1, except that the shed structure 4-2 of this embodiment is an inner and an outer circle of arc-shaped grooves, and the distance between the centers of the two circles of grooves is 6 mm. The groove depth is 2mm. Compared with Example 1, the shed structure adopted in this example can increase the creepage distance between the inner and outer electrode layers and further reduce the fringe electric field intensity. The capacitor of this embodiment is encapsulated by epoxy resin 5 through conventional encapsulation technology, and the structure after encapsulation is as follows image 3 (b) shown.

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Abstract

The invention provides a tubular high-voltage ceramic capacitor with umbrella skirt structures, and belongs to the technical field of a capacitor. The tubular high-voltage ceramic capacitor comprisesa ceramic tube; umbrella skirt structures are arranged on the upper and lower end planes of the ceramic tube respectively; inner and outer metal electrode layers are coated in the inner and outer walls of the ceramic tube respectively; metal leads are welded on the surfaces of the inner and outer metal electrode layers respectively; and the led-out inner and outer metal leads are used as low-voltage and high-voltage electrodes of the high-voltage ceramic capacitor respectively. By virtue of the high-voltage ceramic capacitor, the problem of electric field concentration on the edges of the electrodes can be solved, the probability of breakdown on the edges of the electrodes is lowered, and the voltage withstand and reliability of the high-voltage ceramic capacitor are greatly improved; meanwhile, compared with the conventional disc-shaped high-voltage ceramic voltage, the capacitance of the capacitor disclosed in the invention is greatly improved; and therefore, the high-voltage ceramiccapacitor can be applied to a high-precision capacitive voltage divider, an energy supply power supply and other electric power high-voltage equipment, as well as a high-power power supply and otherequipment which needs a high-capacity ceramic capacitor.

Description

technical field [0001] The invention relates to a tubular high-voltage ceramic capacitor with an umbrella shed structure, which belongs to the technical field of capacitors. Background technique [0002] High-voltage ceramic capacitors are widely used in various industries due to their wide operating temperature range, high reliability, long life, and small size. They are indispensable in high-voltage equipment such as power equipment, AC and DC high-voltage power supplies, and high-power pulse sources. One of the electronic components. At present, the ceramic core of high-voltage ceramic capacitors mostly adopts a disc-shaped structure, and the upper and lower surfaces are filled with silver electrodes. The capacitor is encapsulated in epoxy resin as a whole. This structure capacitor occupies most of the market for high-voltage ceramic capacitors, and its capacity is generally small. . With the development of miniaturization and light weight of high-voltage equipment, mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G4/005H01G4/12H01G4/228H01G4/28
CPCH01G4/005H01G4/12H01G4/228H01G4/28
Inventor 陈喆
Owner 北京智罗盘智能电气有限公司
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