Tubular high-voltage ceramic capacitor with umbrella skirt structures

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...

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

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