Micro paster type high voltage-resistant protection element and preparation method thereof

Abstract

The invention relates to a micro paster type high voltage-resistant protection element and a preparation method thereof. According to the fuse, a substrate, a front-surface electrode, a back-surface electrode, a fusing body, a protection layer and an end socket are arranged. According to the method, a substrate is prepared; the substrate is coated with an arc extinguishing layer and is coated with the fusing body during preparation, wherein the arc extinguishing layer is made of thermoplastic elastic materials and is formed by rubbers filled with quartz sands; and the arc extinguishing layer is formed by an encapsulating layer that is made of epoxy resin materials. On the basis of bonging and etching modes, the fusing body and the front-surface electrode are connected, so that a series of electrical performances like the fuse finished product resistance value and the like become stable and the combining point is almost not influenced by the temperature. Moreover, the rubbers filled with quartz sands are used as the arc extinguishing materials, so that the fuse can still work effectively under the voltage of 220Vac to110Vac and the service life is long.

Description

technical field [0001] The invention relates to a miniature patch type high voltage resistant protection element and a preparation method thereof. Background technique [0002] SMD fuse is an electrical component installed in the circuit to ensure the safe operation of the circuit. With the continuous miniaturization of electronic devices, at the same time, the increase in operating voltage requires the size of the SMD fuse to be small enough. If SMD If the working voltage of the type fuse can reach about 250Vac, it can cover the market with a voltage between 220Vac and 110Vac. [0003] Currently commonly used patch fuses, one type of commonly used structure is: the fuse is suspended in the tube body, and the ends of the tube body are sealed with ends. This type of tube body material is generally made of ceramics or glass. The strength is high, but the toughness is not enough. When the size of the fuse is reduced to a certain extent, and the working voltage is as high as 2...

AI Technical Summary

Problems solved by technology

[0003] Currently commonly used patch fuses, one type of commonly used structure is: the fuse is suspended in the tube body, and the ends of the tube body are sealed with ends. This type of tube body material is generally made of ceramics or glass. High strength, but not tough enough

When the size of the fuse becomes smaller to a certain extent, and the working voltage is as high as 250Vac, the arc will cause the fuse body to explode and be damaged during the process of short circuit and breaking of the protected circuit, and the product will fail.

Another type of chip fuse structure is: fix the fuse body on the surface of a flat substrate, cover the fuse body with a protective layer, and then make two ends of the fuse to form electrical conduction. This type of fuse substrate It is usually ceramic material or PCB substrate, and the protective layer material is usually resin, glass or ceramics. When the size of the fuse of this type of structure is small to a certain extent, and the working voltage is as high as 250Vac, the arc will cause the protective layer of the fuse during the breaking process. or substrate damage, product failure

In addition, the traditional solder connection between the fuse link and the front electrode has the disadvantages of fluctuating electrical properties, and the joint point is affected by high temperature.

[0004] In the process of making the SMD type high voltage fuse, how to effectively extinguish the arc has become the main concern. At present, the commonly used arc extinguishing method is to fill the fuse tube body with arc extinguishing material, and the arc extinguishing material is wrapped in the tube body. When the fuse link is broken by a short circuit, the generated arc is extinguished by the arc extinguishing material. The currently used arc extinguishing material is quartz sand or other inorganic powder. This kind of granular arc extinguishing material has low filling efficiency and strong thermal conductivity. Can affect the fusing characteristics of the fuse element

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