Fuse

Abstract

The utility model discloses a fuse, which comprises a substrate, electrodes, a bridge layer and a melt layer, wherein the bridge layer and the melt layer are positioned on the substrate and at the middle position; wherein the middle part of the melt layer is elevated by the bridge layer, so that arc discharge of the melt can be blocked during breaking, the high instant arc extinguishing capability is realized, the high breaking capability can be easily realized, and meanwhile, the high anti-surge capability is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of fuse structures, in particular to a novel fuse. Background Art

[0002] With the development of the current electronic industry, the requirements for miniaturization and integration of components in the field of electronic products are becoming increasingly higher, and the size of chip protection components has also been greatly reduced. However, while reducing the size of chip protection components, there is currently a lack of effective solutions to simultaneously improve their breaking performance and fusing capacity. In long-term use, protection components must also be able to withstand the impact of frequent switching on and off and indirect lightning surges to maintain long-term stability and effectiveness of performance.

[0003] Currently on the market, different small fuses have suspended fuse structures and metal copper foil etching processes, but they are all limited by the structure. Either the fuse performance is unstable or the breaking capacity does not meet the requirements. They can only be used in low-voltage fields. They cannot meet the requirements of high voltage and high surge resistance. Protection components often cannot withstand frequent surge shocks and fail, thus creating safety hazards.

[0004] Therefore, a new technical solution is needed to solve the above technical problems. Utility Model Content

[0005] In view of the above problems, the purpose of the utility model is to provide a new type of fuse to improve the rapid breaking capability of the fuse and ensure that the fuse is completely ineffective after the fuse produces a melting action.

[0006] In order to achieve the above-mentioned target functions, the fuse of the utility model can adopt the following technical solutions:

[0007] A fuse includes a substrate and electrodes located at both ends of the substrate, a bridge layer located on the substrate and in the middle, and a melt layer located on the substrate and the bridge layer; the two ends of the melt layer are respectively connected to the electrodes at both ends, the middle part of the melt layer covers the bridge layer, and the middle part of the melt layer covering the bridge layer is higher than other parts of the melt layer.

[0008] Furthermore, the thickness of the middle part of the melt layer covering the bridge layer is recorded as H, the thickness of the bridge layer is recorded as h, and the ratio of H to h is in the range of 0.1-0.4.

[0009] Furthermore, the electrode includes an inner electrode and an outer electrode, both of which are made of conductive materials. The inner electrode includes a surface electrode located on the upper surface of the substrate and connected to the melt layer, a back electrode located on the lower surface of the substrate, and a side electrode located on the end surface of the substrate, and the side electrode connects the surface electrode and the back electrode; the outer electrode is buckled on the inner electrode through the shape of an end cap.

[0010] Furthermore, the upper surface of the substrate is also covered with a protective layer, which is located between the electrodes at both ends and completely covers the bridge layer and the melt layer.

[0011] Furthermore, the bridge layer is located in the middle of the two end electrodes and the length of the bridge layer is smaller than the distance between the two end electrodes; the middle parts of the two ends of the melt layer that are not covered on the bridge layer are directly attached to the upper surface of the substrate and the height is lower than the middle part, and the connection between the melt layer part attached to the upper surface of the substrate and the middle part of the melt layer forms an inclined slope shape.

[0012] Furthermore, the width of the melt layer is smaller than the width of the bridge layer.

[0013] Furthermore, the length of the bridge layer is slightly less than or equal to the length of the fracture after the melt breaking action.

[0014] Furthermore, the melt layer is made of metal, the bridge layer is made of insulating material, and the substrate is made of insulating ceramic or resin.

[0015] Beneficial effects: In the technical solution provided by the utility model, the bridge layer in the fuse raises the middle of the melt layer, which can block the melt arcing during breaking, has a high instantaneous arc extinguishing ability, can easily achieve high breaking capacity and ensure high surge resistance at the same time; and, the protrusion of the bridge layer can effectively block the melted metal from being connected again when the fuse is actuated, ensuring that the fuse is completely ineffective after the fuse produces a melting action, thereby ensuring excellent insulation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional diagram of the fuse in the utility model, and shows the state of the protective layer separated from the base body to observe the melt layer;

[0017] Figure 2 It is a cross-sectional schematic diagram of the fuse of the utility model;

[0018] Figure 3 It is a schematic diagram of the melt layer thickness H and the bridge layer thickness h in the fuse of the utility model. DETAILED DESCRIPTION

[0019] The embodiments of the present utility model are described in detail below.

[0020] See also Figure 1 and Figure 2As shown, a fuse provided in this embodiment includes a substrate 1 and electrodes located at both ends of the substrate, a bridge layer 2 located on the substrate 1 and in the middle, and a melt layer 3 located on the substrate 1 and the bridge layer 2. The two ends of the melt layer 3 are respectively connected to the electrodes at both ends, and the middle part of the melt layer 3 covers the bridge layer 2 so that the middle part is raised by the bridge layer 2, that is, the middle part of the melt layer 3 covering the bridge layer 2 is higher than the other parts of the melt layer 3. Figure 2 As shown, the bridge layer 2 is located in the middle of the two end electrodes and the length of the bridge layer 2 is less than the distance between the two end electrodes. The middle parts of the two ends of the melt layer 3 that are not covered on the bridge layer 2 are directly attached to the upper surface of the substrate 1 and are lower in height than the middle part. The melt layer part attached to the upper surface of the substrate 1 and the middle part of the melt layer attached to the bridge layer 2 form an inclined slope shape at the connection. Therefore, since the bridge layer raises the middle of the melt layer, it can block the melt arcing during disconnection, has a higher instantaneous arc extinguishing ability, can easily achieve high disconnection ability and ensure high surge resistance at the same time; and the protrusion of the bridge layer can effectively block the reconnection of the melted metal when the fuse is actuated. To ensure this effect, the length of the bridge layer 2 is slightly less than or equal to the length of the fracture after the melt disconnection action, to ensure that the fuse is completely ineffective after the fuse produces a melting action.

[0021] The electrodes include an inner electrode and an outer electrode, both of which are made of conductive materials. The inner electrode includes a surface electrode 7 located on the upper surface of the substrate 1 and connected to the melt layer 3, a back electrode 8 located on the lower surface of the substrate 1, and a side electrode 5 located on the end surface of the substrate 1, and the side electrode 5 connects the surface electrode 7 and the back electrode 8. The outer electrode 6 is buckled on the inner electrode through the shape of an end cap. The upper surface of the substrate 1 is also covered with a protective layer 4, which is located between the electrodes at both ends and completely covers the bridge layer 2 and the melt layer 3.

[0022] like Figure 3 As described, in this embodiment, the thickness of the middle part of the melt layer 3 covering the bridge layer 2 is recorded as H, the thickness of the bridge layer is recorded as h, and the ratio of H to h is in the range of 0.1-0.4, which can significantly improve the product's breaking performance and improve product reliability. The data obtained from the breaking NG experiment shown in the following table include the fuses in the prior art where there is no bridge layer and the melt layer is laid flat on the substrate (the "no bottom layer" column in the table), and the fuses in the utility model where there is a bridge layer (by designing different ratios of the melt layer height to the bridge layer height and testing them separately). 50 groups of each fuse are tested and recorded as the denominator. The number of whether the fuse mark on the product after the fuse is blown after 50 tests can be identified is used as the data of successful blowing and recorded as the numerator. It can be seen from the test comparison table that the success rate of each fuse with a bridge layer is higher than the success rate of the fuse in the prior art.

[0023] Break NG Bottom layer thickness Melt thickness / bottom layer thickness 11 / 50 No bottom layer / 5 / 50 There is a bottom layer 0.40 0 / 50 There is a bottom layer 0.20 2 / 50 There is a bottom layer 0.18 2 / 50 There is a bottom layer 0.10

[0024] In this embodiment, the materials of each component are as follows: the substrate is an insulating ceramic or resin material; the bridge layer is an insulating and heat-insulating material, a non-metallic layer formed by printing, sintering or bonding; the melt layer is a metal material, and its components are gold, silver, copper, nickel, iron, tin or one or an alloy thereof; the protective layer is an arc-extinguishing insulating layer, which is a one-layer or multi-layer structure composed of glass or epoxy resin layers; the electrode is made of common conductive metal materials for electrodes.

Claims

1. A fuse comprising a substrate and electrodes located at both ends of the substrate, characterized in that: It also includes a bridge layer located on the substrate and in the middle, and a melt layer located on the substrate and the bridge layer; The two ends of the melt layer are respectively connected to the two end electrodes, the middle part of the melt layer covers the bridge layer, and the middle part of the melt layer covering the bridge layer is higher than other parts of the melt layer.

2. The fuse according to claim 1, characterized in that The thickness of the middle part of the melt layer covering the bridge layer is recorded as H, the thickness of the bridge layer is recorded as h, and the ratio of H to h is in the range of 0.1-0.

4.

3. The fuse according to claim 2, characterized in that The electrodes include an inner electrode and an outer electrode, both of which are made of conductive materials. The inner electrode includes a surface electrode located on the upper surface of the substrate and connected to the melt layer, a back electrode located on the lower surface of the substrate, and a side electrode located on the end surface of the substrate, and the side electrode connects the surface electrode and the back electrode; the outer electrode is buckled on the inner electrode through the shape of an end cap.

4. The fuse according to claim 1, characterized in that The upper surface of the substrate is also covered with a protective layer, which is located between the electrodes at both ends and completely covers the bridge layer and the melt layer.

5. The fuse according to claim 1 or 2, characterized in that: The bridge layer is located in the middle of the two end electrodes and the length of the bridge layer is less than the distance between the two end electrodes; the middle parts of the two ends of the melt layer that are not covered on the bridge layer are directly attached to the upper surface of the substrate and the height is lower than the middle part, and the connection between the melt layer part attached to the upper surface of the substrate and the middle part of the melt layer forms an inclined slope shape.

6. The fuse according to claim 5, characterized in that The width of the melt layer is smaller than the width of the bridge layer.

7. The fuse according to claim 1 or 2, characterized in that: The length of the bridge layer is slightly less than or equal to the length of the fracture after the melt breaking action.

8. The fuse according to claim 1, characterized in that The melt layer is made of metal, the bridge layer is made of insulating material, and the substrate is made of insulating ceramic or resin.

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