Resettable line fuse product structure
By combining the polymer PTC layer with the conductive layer in the fuse, and adding the copper layer, the problem of unstable connection between the welding layer and the conductive layer is solved, and the overload protection and automatic reset of the current overload are realized. And product quality.
Patent Information
- Application Number
- CN202421050869.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-15
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-05-15
AI Technical Summary
The connection between the existing fuse welding layer and the conductive layer is unstable, resulting in poor conduction performance.
The polymer PTC layer is combined with the conductive layer, and the copper layer is added to optimize the connection between the welding layer and the conductive layer to form a more stable structure.
Achieve over -current protection when the current is overloaded, and automatically reset when the current recovers, which improves the pistol's divert performance and the flatness and good product rate of the product.
Smart Images
Figure CN222421859U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of fuses, in particular to a resettable line fuse product structure. Background Art
[0002] Fuses are also called current fuses. Their main function is to provide overload protection. If the fuse is correctly placed in the circuit, the fuse will melt and cut off the current when the current abnormally rises to a certain height and temperature, thereby protecting the safe operation of the circuit.
[0003] A fuse is a product that protects circuit safety, and its main function is overload protection. The connection between the welding layer and the conductive layer of the existing fuse is not stable, and the welding layer is relatively close to the internal core layer, which can easily affect the internal core layer during welding. At the same time, the conduction performance of the fuse is poor. Utility Model Content
[0004] The utility model aims to provide a resettable line fuse product structure to solve the problem of unstable connection between the welding layer and the conductive layer of the existing fuse proposed in the above background technology.
[0005] To achieve the above purpose, the utility model provides the following technical solutions: a resettable line fuse product structure, comprising: a polymer PTC layer and an insulating plastic sealing layer,
[0006] A conductive layer is disposed on one side of the polymer PTC layer, and the material of the conductive layer is 1OZ copper foil. A bearing copper layer is disposed on the side of the polymer PTC layer away from the conductive layer.
[0007] Preferably, an insulating layer and a welding layer are stacked on a side of the conductive layer away from the polymer PTC layer, and the insulating layer is a double-layer 106PP material.
[0008] Preferably, the bearing copper layer, polymer PTC layer, conductive layer, insulating layer and welding layer are pressed into a three-layer board by a hot press, and the welding layer is made of copper foil.
[0009] Preferably, a blind hole matching the hole-filling layer is opened inside the insulating layer, the hole-filling layer is made of copper, and the hole-filling layer is filled into the blind hole of the insulating layer by electroplating.
[0010] Preferably, the welding layer is connected to the conductive layer through a hole-filling layer, and a surface treatment layer is deposited on one side of the welding layer.
[0011] Preferably, the insides of the polymer PTC layer, the bearing copper layer, the conductive layer and the insulating layer are all provided with plastic sealing grooves matching the insulating plastic sealing layer by a cutting knife.
[0012] Compared with the prior art, the beneficial effects of the resettable line fuse product structure are: when the current is overloaded, the high temperature will cause the temperature of the polymer PTC layer to rise rapidly, causing the polymer PTC layer material to aggregate and expand, resulting in a rapid increase in resistance, limiting the passage of large current, thereby playing an overcurrent protection role; when the current returns to normal, the temperature of the polymer PTC layer returns to normal, and the current can pass through the fuse normally; the bearing copper layer can further improve the conduction performance of the fuse when the normal current is conducted, while making the product structure symmetrical, the product flatness is better during the production process, and the yield rate is higher.
[0013] 1. A fuse is a product that protects circuit safety. It mainly plays an overload protection role. When the current is overloaded, the fuse generates a large amount of heat that cannot be dissipated in time, causing the temperature of the polymer PTC layer to rise rapidly. When the temperature reaches the crystallization and melting temperature of the material, the polymer PTC layer material gathers and expands, blocking the conductive path composed of conductive particles, causing the resistance to rise rapidly, limiting the passage of large current, thereby playing an overcurrent protection role. When the current returns to normal, the temperature of the polymer PTC layer returns to normal, and the current can pass through the fuse normally, achieving the effect of automatic reset.
[0014] 2. By adding a load-bearing copper layer to the fuse, the conduction performance of the fuse can be further improved when the normal current is conducted. At the same time, the product structure is made symmetrical, the product flatness is better during the production process, and the yield rate is higher. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a schematic diagram of the fuse of the utility model;
[0016] Figure 2 This is a schematic diagram of the fuse segmentation of the utility model.
[0017] In the figure: 1. Polymer PTC layer; 2. Conductive layer; 3. Insulating layer; 4. Welding layer; 5. Hole-filling layer; 6. Surface treatment layer; 7. Insulating plastic sealing layer; 8. Bearing copper layer. DETAILED DESCRIPTION
[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0019] See also Figure 1-Figure 2 The utility model provides a technical solution: a resettable line fuse product structure, including: a polymer PTC layer 1 and an insulating plastic layer 7,
[0020] A conductive layer 2 is provided on one side of the polymer PTC layer 1, and the material of the conductive layer 2 is 1OZ copper foil, and a bearing copper layer 8 is provided on the side of the polymer PTC layer 1 away from the conductive layer 2; an insulating layer 3 and a welding layer 4 are overlapped on the side of the conductive layer 2 away from the polymer PTC layer 1, and the insulating layer 3 is a double-layer 106PP material; the bearing copper layer 8, the polymer PTC layer 1, the conductive layer 2, the insulating layer 3 and the welding layer 4 are pressed into a three-layer board by a hot press, and the material of the welding layer 4 is copper foil; a blind hole matching the hole-filling layer 5 is opened inside the insulating layer 3, the hole-filling layer 5 is made of copper, and the hole-filling layer 5 is filled into the blind hole of the insulating layer 3 by electroplating; the welding layer 4 is conductive with the conductive layer 2 through the hole-filling layer 5, and a surface treatment layer 6 is deposited on one side of the welding layer 4; a plastic sealing groove matching the insulating plastic sealing layer 7 is opened inside the polymer PTC layer 1, the bearing copper layer 8, the conductive layer 2 and the insulating layer 3 by a cutting knife.
[0021] In specific implementation, the fuse is a product that protects circuit safety, mainly for overload protection. When processing the fuse, first prepare a set of double-sided copper foil core boards consisting of a polymer PTC layer 1, a conductive layer 2 and a bearing copper layer 8. On the double-sided board, through film lamination, exposure, development, etching, and film stripping, the conductive layer 2 is the pad required by the product, and the bearing copper layer 8 is a reference pattern for the subsequent process of hooking the groove. Two insulating layers 3 and a welding layer 4 are superimposed on one side of the conductive layer 2. The polymer PTC layer 1, the conductive layer 2, the insulating layer 4 are pressed by a hot press. The insulating layer 3, the welding layer 4 and the bearing copper layer 8 are pressed into a three-layer board, and then the plastic sealing groove is cut out with a cutting knife with reference to the pattern of the bearing copper layer 8, and the plastic sealing groove is injected with glue to form an insulating plastic sealing layer 7, and the product is plastic sealed, and blind holes are processed in the insulating layer 3, and the hole filling layer 5 is electroplated to make the conductive layer 2 and the welding layer 4 conductive, and the required pattern of the outer layer of the product is made by etching, and then a surface treatment layer 6 is deposited on one side of the welding layer 4 to protect the welding layer 4, and finally the product is divided into required single particles according to the design;
[0022] The core layer is composed of a conductive layer 2 and a polymer PTC layer 1. The welding layer 4 is completely separated from the core layer, which effectively reduces the influence of welding, repair or disassembly on the performance of electronic materials. The core layer is completed inside the structure and can stably exert its characteristics of conduction, tripping, resetting, etc. The hole-filling layer 5 ensures a good connection between the welding layer 4 and the conductive layer 2 by electroplating hole-filling. During normal operation, part of the heat generated when the current flows through the fuse will be dissipated to the environment, and part of it will increase the temperature of the polymer PTC layer 1. Under the working current, the heat generated and the heat dissipated reach a balance, and the current can pass normally. When the current is overloaded, the fuse generates a large amount of heat that cannot be dissipated in time, resulting in a rapid increase in the temperature of the polymer PTC layer 1. When the temperature reaches the crystallization and melting temperature of the material, the polymer PTC layer 1 material gathers and expands, blocking the conductive path composed of conductive particles, resulting in a rapid increase in resistance, limiting the passage of large current, thereby playing an overcurrent protection role. When the current returns to normal, the temperature of the polymer PTC layer 1 returns to normal, and the current can pass through the fuse normally again, achieving the effect of automatic reset;
[0023] By adding the bearing copper layer 8 to the fuse, the conduction performance of the fuse when the normal current is conducted can be further improved, and at the same time, the product structure can be made symmetrical, the product flatness can be better during the production process, and the yield rate can be higher.
[0024] In summary: when using a resettable line fuse product structure, when the current is overloaded, the high temperature of the fuse will cause the polymer PTC layer 1 to heat up rapidly, thereby tightly blocking the conductive path and limiting the current flow. This is the characteristic of the resettable line fuse product structure. The content not described in detail in this description belongs to the prior art known to professional and technical personnel in this field.
[0025] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.
Claims
1. A resettable line fuse product structure, comprising: The polymer PTC layer (1) and the insulating plastic sealing layer (7) are characterized by: A conductive layer (2) is provided on one side of the polymer PTC layer (1), and the material of the conductive layer (2) is 1OZ copper foil. A bearing copper layer (8) is provided on the side of the polymer PTC layer (1) away from the conductive layer (2).
2. The resettable line fuse product structure according to claim 1, characterized in that: An insulating layer (3) and a welding layer (4) are stacked on the side of the conductive layer (2) away from the polymer PTC layer (1), and the insulating layer (3) is a double-layer 106PP material.
3. The resettable line fuse product structure according to claim 1, characterized in that: The bearing copper layer (8), the polymer PTC layer (1), the conductive layer (2), the insulating layer (3) and the welding layer (4) are pressed into a three-layer board by a hot press, and the material of the welding layer (4) is copper foil.
4. The resettable line fuse product structure according to claim 2, characterized in that: A blind hole matching the hole-filling layer (5) is provided inside the insulating layer (3); the hole-filling layer (5) is made of copper, and the hole-filling layer (5) is filled into the blind hole of the insulating layer (3) by electroplating.
5. The resettable line fuse product structure according to claim 2, characterized in that: The welding layer (4) is electrically connected to the conductive layer (2) via the hole-filling layer (5), and a surface treatment layer (6) is deposited on one side of the welding layer (4).
6. The resettable line fuse product structure according to claim 1, characterized in that: The polymer PTC layer (1), the bearing copper layer (8), the conductive layer (2) and the insulating layer (3) are all provided with plastic sealing grooves matching the insulating plastic sealing layer (7) through a cutting knife.