Fuse with internal buffer layer, and manufacturing method for fuse

Abstract

The invention relates to a fuse with an internal buffer layer, and a manufacturing method for the fuse. The fuse comprises an insulating substrate, at least one fusing body formed on the insulating substrate, and end electrodes which are formed at the two ends of the insulating substrate and are connected with the fusing body; the fuse also comprises at least one arc-extinguishing layer which is formed in the insulating substrate and positioned around the fusing body, and at least one buffer layer which is formed on the peripheral surface of the arc-extinguishing layer or / and the peripheral surface of the fusing body; and the buffer layer is an accommodating space or has a porous structure. By adoption of the fuse with the internal buffer layer, problems of shrinkage mismatch or mutual diffusion of the fusing body and the buffer layer in a glue-discharging and sintering process can be overcome; phenomena of deformation, bending, defects and the like of the fusing body can be avoided; concentrated resistance value distribution and high fusing linearity of the fusing body are ensured, and a fusing non-linear phenomenon is avoided; and meanwhile, the normal operation of a circuit can be ensured.

Description

technical field [0001] The invention belongs to the field of fuses and relates to a fuse, in particular to a fuse with a built-in buffer layer and a manufacturing method thereof. Background technique [0002] With the development of science and technology, electric / electronic products are increasingly diversified and complex, and the circuit protection components used are no longer simple glass tube fuses in the past, but have developed into a wide variety of new electronic components. As a new type of thin, light and small component, the fuse is suitable for the protection circuit of various electronic products with compact structure and small size, and its application field is very wide. [0003] With the increase of the voltage in the circuit, the safety hazards such as substrate breakage, fragmentation, burning board and substrate flying off the circuit board will occur when the fuse cannot withstand the voltage increase during the fusing process. Therefore, it is necess...

AI Technical Summary

Problems solved by technology

[0003] With the increase of the voltage in the circuit, the safety hazards such as substrate breakage, fragmentation, burning board and substrate flying off the circuit board will occur when the fuse cannot withstand the voltage increase during the fusing process. Therefore, it is necessary to improve the withstand voltage capacity of the fuse

The Chinese invention with the application number 201010122121.5 adopts the embedded circuit lamination method, at least one pressure relief and heat accumulation space is provided between two stacked substrates, and the fuse is inserted in the pressure relief and heat accumulation space. The thermal space can accumulate the high temperature generated by the fuse when the current passes through, and can release the pressure generated by the fuse when it is blown; but the disadvantage of this method is that the fuse is installed in the pressure relief and heat accumulation space, at least One side is in the groove and the patent mentions that the protective element will be sintered, and the sintering process is the shrinkage and densification process of the fuse link and the ceramic substrate. Since at least one side of the fuse link is in the groove structure, it cannot shrink together with the substrate. It is easy to cause bending deformation of the fuse link, and at the same time, due to gravity, the fuse link will also bend and deform towards the groove surface. The bending deformation of the fuse link will lead to poor consistency of the fuse, and it is prone to nonlinear fusing Affect the normal operation of the line

[0004] The Chinese invention with the application number 201210277104.8 adopts a stamping groove on the ceramic substrate of the component, and the porous ceramic slurry or pore-forming agent slurry of LTCC is filled in the stamping groove, and the porous ceramic slurry or pore-forming agent slurry filled with LTCC The melt layer is stacked on the ceramic substrate of the porogen slurry so that the melt is located directly above the punched groove of the porous ceramic slurry or porogen slurry filled with LTCC, and then stacked on the ceramic substrate with the melt layer Another ceramic substrate, the punched groove parts of the two ceramic substrates are located in the same vertical plane, so that the melt layer is located between the punched groove parts of the porous ceramic slurry or pore-forming agent slurry filled with LTCC, and can be dispersed The impact of the high-pressure heat flow generated when the fuse link operates on the product itself, this method of dry forming needs to press the two ceramic substrates together in the later stage, this pressurization process will cause the pore-forming slurry and the melting The body is extruded, causing the melt to deform. At the same time, this scheme introduces porous ceramics or pore-forming agents to discharge organic matter through low-temperature co-firing, thereby forming a porous structure. The existence of these holes will cause the fuse to diffuse to the above-mentioned In the hole, the fuse itself is defective, which affects the resistance of the fuse, increases the power consumption in the line, and the consistency of the fuse becomes poor, and abnormal fusing occurs, which affects the normal operation of the line.

[0005] Due to the existence of pressure relief and heat accumulation spaces in the above patents and the introduction of holes, cavities and arc layers, the fuse itself will be bent and deformed during the molding process and the low temperature co-firing process will be due to the shrinkage mismatch (free surface shrinkage of the cavities and The different shrinkage of the two materials above and below the electrode) will cause bending, deformation and defects, which will affect the most basic resistance value, fusing performance and safe breaking capacity of the fuse link, resulting in discrete resistance values ​​of the fuse link, and non-linear fusing of the fuse link under overload conditions. When the circuit is short-circuited, the fuse cannot be broken safely, and there will be phenomena such as blowing, bursting, side spraying or burning boards that endanger the safety of the line.

Images