TVS device with automatic open circuit protection function

Abstract

The utility model discloses a TVS (Transient Voltage Suppressor) device with an automatic open circuit protection function, which relates to the technical field of TVS devices and comprises a product crystal grain. The upper metal frame is arranged at the upper end of the product crystal grain; the lower metal frame is arranged at the lower end of the product crystal grain; the packaging layer is used for packaging the upper metal frame, the lower metal frame and the product crystal grains; wherein the upper metal frame is provided with a fuse link located in the packaging layer, and the thickness of the fuse link is smaller than that of the upper metal frame. The fuse link is arranged on the upper metal frame, the upper metal frame and the lower metal frame are both made of metal copper, the metal copper has good conductivity, current circulation can be effectively guaranteed, the thickness of the fuse link is smaller than that of the first metal frame, surge occurs, and therefore when current is too large and the fuse link is thin, the fuse link is burnt out more easily, and the service life of the fuse link is prolonged. Therefore, the fuse link is burnt out firstly, and the whole circuit is cut off immediately, so that the product protection effect is improved, and the safety of the whole TVS device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of TVS devices, in particular to a TVS device with an automatic circuit breaker protection function. Background Art

[0002] With the rapid development of electronic products, products tend to be smaller and thinner, and the nanotechnology of IC chips tends to mature. The problem that follows is that the EMS immunity tolerance of IC chips is reduced, and it is necessary to add corresponding TVS and other protection devices for EMS immunity protection, thereby improving the reliability, safety and service life of electronic products in actual application environments.

[0003] The failure mode of existing TVS devices is short circuit. In some products with high reliability requirements (such as automotive electronics and medical industries), when the TVS product works and exceeds the TVS's own tolerance and short circuits, if the fuse is not disconnected in time in the circuit design of the entire product, the TVS short circuit will cause the product to burn abnormally, which poses a great threat to the user's personal safety. Therefore, a TVS device with automatic open circuit protection function is needed. Utility Model Content

[0004] The utility model aims to provide a fuse so that when the surge current is too large, the fuse is first burned out, so that the circuit is in an open circuit state, thereby protecting the product grains.

[0005] In order to achieve the above-mentioned utility model purpose, the utility model provides the following technical solutions:

[0006] A TVS device with automatic circuit-breaking protection function, including a product crystal grain;

[0007] An upper metal frame is provided on the upper end of the product grain;

[0008] A lower metal frame is provided at the lower end of the product grain;

[0009] The packaging layer packages the upper metal frame, the lower metal frame and the product die;

[0010] Wherein, the upper metal frame is provided with a fuse located in the packaging layer, and the thickness of the fuse is smaller than the thickness of the upper metal frame.

[0011] To implement the above technical solution, the upper metal frame and the lower metal frame are both made of metal copper. Metal copper has good conductivity and can effectively ensure the flow of current. The thickness of the fuse is thinner than the thickness of the metal frame. When a surge occurs, when the current is too large, the thinner fuse is easier to burn out, so that the fuse burns out first, immediately disconnecting the entire circuit, thereby improving the protection effect of the product.

[0012] As a preferred technical solution of the present application, the fuse connects the upper metal frame without interruption.

[0013] The above technical solution is implemented to achieve uninterrupted connection, so as to ensure that the current can pass normally through the fuse during normal use and maintain normal operation.

[0014] As a preferred technical solution of the present application, the fuse is located within the downward projection range of the packaging layer.

[0015] As a preferred technical solution of the present application, the fuse is a component made of lead-antimony alloy material.

[0016] As a preferred technical solution of the present application, the fuse is a component made of copper wire material.

[0017] As a preferred technical solution of the present application, the encapsulation layer is a component made of epoxy resin black glue.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] 1. By setting a fuse on the upper metal frame, the upper metal frame and the lower metal frame are both made of metal copper. Metal copper has good conductivity and can effectively ensure the flow of current. The thickness of the fuse is thinner than the thickness of the metal frame. When a surge occurs, when the current is too large, the thinner fuse is easier to burn out, so that the fuse burns out first, immediately disconnecting the entire circuit, thereby improving the protection effect of the product and improving the safety of the overall TVS device.

[0020] 2. The fuse is made of lead-antimony alloy material or copper wire material with strong conductivity. When the surge current exceeds the current carrying capacity of the TVS device, the fuse can be blown more quickly and efficiently at the notch, so that the TVS device quickly enters the open circuit state and instantly disconnects the entire circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional view of the overall structure of a TVS device with automatic open circuit protection function in an embodiment of the utility model.

[0022] Indications in the figure: 1. Product grain; 2. Upper metal frame; 21. Fuse; 3. Lower metal frame; 4. Packaging layer. DETAILED DESCRIPTION

[0023] To make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments.

[0024] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the present invention to be protected, but merely represents some embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0027] Example:

[0028] See also Figure 1 As shown, this embodiment provides a TVS device with automatic open circuit protection function.

[0029] A TVS device with automatic open circuit protection function, comprising a product grain 1;

[0030] An upper metal frame 2 is provided at the upper end of the product crystal 1, and a lower metal frame 3 is provided at the lower end of the product crystal;

[0031] The packaging layer 4 packages the upper metal frame 2, the lower metal frame 3 and the product die 1;

[0032] The upper metal frame 2 is provided with a fuse 21 located in the packaging layer 4 , and the thickness of the fuse 21 is smaller than the thickness of the upper metal frame 2 .

[0033] The fuse 21 connects the upper metal frame 2 without interruption to ensure that the current can pass normally through the fuse 21 during normal use to maintain normal operation.

[0034] The fuse 21 is a component made of a lead-antimony alloy material. The lead-antimony alloy has a good electrical conductivity, which ensures that the overall structure can be powered.

[0035] The encapsulation layer 4 is a component made of epoxy resin black glue. To prevent the product grain 1 from being exposed to the outside when the overall device is used for a long time, the upper metal frame 2 and the lower metal frame 3 extend out of the encapsulation layer 4 on the side away from each other, ensuring the connection effect between the upper metal frame 2 and the lower metal frame 3 and the circuit. The fuse 21 is located within the downward projection range of the encapsulation layer 4, which can also protect the fuse 21 and prevent the weak fuse 21 from being damaged by external forces, thereby ensuring the service life of the overall TVS device.

[0036] In another embodiment of the present application, the fuse 21 is a component made of copper wire material. Copper itself has a good electrical conductivity, which ensures that the whole structure can be powered.

[0037] In the description of the present utility model, it should be noted that the terms "upper", "lower", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, or the orientation or position relationship commonly understood by those skilled in the art. Such terms are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0038] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the above specific implementation methods. Therefore, any modification or equivalent replacement of the present invention; and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention are included in the scope of the claims of the present invention.

Claims

1. A TVS device with automatic open circuit protection function, characterized in that: The invention comprises a product grain (1); An upper metal frame (2) is arranged on the upper end of the product crystal grain (1); A lower metal frame (3) is arranged at the lower end of the product crystal grain (1); The packaging layer (4) packages the upper metal frame (2), the lower metal frame (3) and the product crystal grain (1); Wherein, a fuse (21) located in the packaging layer (4) is provided on the upper metal frame (2), and the thickness of the fuse (21) is smaller than the thickness of the upper metal frame (2).

2. The TVS device with automatic open circuit protection function as claimed in claim 1, characterized in that: The fuse (21) seamlessly connects the upper metal frame (2).

3. The TVS device with automatic open circuit protection function as claimed in claim 2, characterized in that: The fuse (21) is located within the downward projection range of the packaging layer (4).

4. The TVS device with automatic open circuit protection function as claimed in claim 1, characterized in that: The fuse (21) is a component made of lead-antimony alloy material.

5. The TVS device with automatic open circuit protection function as claimed in claim 1, characterized in that: The fuse (21) is a component made of copper wire material.

6. The TVS device with automatic open circuit protection function according to any one of claims 1 to 5, characterized in that: The packaging layer (4) is a component made of epoxy resin black glue.

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