Over-temperature and overvoltage composite protection device
By incorporating a ceramic fuse structure and a cavity air passage design within the TVS chip, the problem of the TVS chip lacking over-temperature protection is solved, enabling rapid opening and safe melting to prevent circuit burnout or explosion.
Patent Information
- Application Number
- CN202423185700.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2034-12-23
AI Technical Summary
TVS chips lack over-temperature protection in circuit systems, which can cause heat to be generated when there is overvoltage or overcurrent, potentially leading to circuit burnout or explosion, posing a safety hazard.
A ceramic fuse structure is set inside the TVS chip. The fuse melts and forms an open circuit when the temperature is too high. Combined with the cavity and gas channel design, it stores the molten material and gas to prevent accumulation and explosion.
It enables rapid open circuit formation under over-temperature or over-voltage conditions, avoiding system short circuits and explosions, and improving the safety and reliability of the circuit.
Smart Images
Figure CN223693131U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to TVS overvoltage chip combines ceramic fuse overtemperature protection field, specifically overtemperature overvoltage composite protection device. BACKGROUND
[0002] TVS chip application in circuit system is equipped with fuse to form overtemperature overvoltage protection, but the overvoltage of chip itself is equipped with but does not have overtemperature protection, once circuit system appears overvoltage or overcurrent and leads to TVS chip short circuit and produces a large amount of heat and causes circuit to burn, even some circuits with closed shell are easy to burst and lead to personnel to be hurt. SUMMARY
[0003] To solve the defects of the prior art, the utility model provides an overtemperature overvoltage composite protection device, and the utility model can set a ceramic fuse structure in the chip, and realize open circuit by fusing the fuse to protect the whole system when the temperature is too high.
[0004] To achieve the above technical purpose, the utility model adopts the following technical scheme: an overtemperature overvoltage composite protection device, comprising a first metal sheet and a second metal sheet, a ceramic sheet is arranged between the first metal sheet and the second metal sheet, a fuse is arranged in the ceramic sheet, and the two ends of the fuse are in conductive contact with the first metal sheet and the second metal sheet respectively.
[0005] The ceramic sheet is provided with a first cavity and a second cavity, the first cavity is provided with an air cavity, and the first cavity and the second cavity are in contact with the fuse respectively.
[0006] The first cavity and the second cavity are annular, the first cavity is located on the upper side of the second cavity, and the volume of the first cavity is greater than that of the second cavity.
[0007] The outer ring of the first cavity is lower than the inner ring of the first cavity, and the air cavity is higher than the inner ring of the first cavity.
[0008] The ceramic sheet is also provided with an air channel, the inner end of the air channel is connected with the fuse, and the outer end is connected with the outside.
[0009] The air channel comprises an ascending inclined section and a descending inclined section, the ascending inclined section and the descending inclined section are connected at an obtuse angle or a right angle, the inner end of the ascending inclined section is connected with the fuse, and the outer end of the descending inclined section is connected with the outside.
[0010] The inner end of the ascending inclined section is embedded with a melting column, the melting point of the melting column is lower than that of the fuse, and the melting column seals the air channel.
[0011] The outer end of the descending inclined section is provided with a sealing column, which seals the air passage.
[0012] The descending inclined section is a vacuum.
[0013] The two ends of the first cavity and the second cavity are respectively provided with sunken collecting grooves.
[0014] The air cavity is a convex structure on the inner ring of the first cavity.
[0015] In summary, the utility model achieves the following technical effects:
[0016] The utility model discloses a ceramic fuse structure is arranged in the chip, and the temperature is too high and can cause fuse to fuse, thereby forming open circuit, can solve the problem of system short circuit caused by system fuse fault;
[0017] The utility model discloses a cavity can store the fuse of fuse, and accelerate the formation open circuit, can solve the problem of system short circuit caused by the slow open circuit of nowhere to store the molten material after fusing;
[0018] The utility model discloses a gas passage can store the gas produced by fusing, prevent explosion, can solve the problem of system short circuit caused by the excessive pressure of fusing gas accumulation. DRAWINGS
[0019] Figure 1 It is a kind of over-temperature over-voltage composite protection device profile schematic diagram;
[0020] Figure 2 It is the profile schematic diagram of the air passage. CONCRETE IMPLEMENTING METHOD
[0021] The utility model will be further explained in detail in combination with the drawings.
[0022] The embodiment is merely the explanation of the utility model, and it is not the limitation of the utility model, and the person skilled in the art can make the modification of no creative contribution according to the need after reading the present specification, but as long as in the right claim range of the utility model, it is protected by patent law.
[0023] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.
[0024] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.
[0025] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication or interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0026] In the utility model, unless otherwise specifically defined and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.
[0027] Embodiment:
[0028] Figure 1The utility model is a kind of overtemperature overvoltage composite protector device profile schematic diagram, including first metal sheet 1 and second metal sheet 5, ceramic sheet 3 is arranged between the first metal sheet 1 and the second metal sheet 5, fuse 6 is arranged inside the ceramic sheet 3, and the both ends of the fuse 6 are respectively in conductive contact with the first metal sheet 1 and the second metal sheet 5;
[0029] The ceramic sheet 3 is provided with a first cavity 31 and a second cavity 32, the first cavity 31 is provided with an air cavity 33, and the first cavity 31 and the second cavity 32 are respectively in contact with the fuse 6.
[0030] Wherein, the upper and lower surfaces of the ceramic sheet 3 are respectively provided with a first surface metal layer 2 and a second surface metal layer 4, the first surface metal layer 2 is in contact with the first metal sheet 1, the second surface metal layer 4 is in contact with the second metal sheet 5, the first metal sheet 1 and the second metal sheet 5 can be made of copper or other metals, the second metal sheet 5 serves as a support, and the first metal sheet 1 serves as an electrode sheet and is applied to a chip. The both ends of the fuse 6 are respectively in contact with the first surface metal layer 2 and the second surface metal layer 4. The TVS chip 7 is connected to the first metal sheet 1 through a metal layer, and the TVS chip 7 is also connected with a copper electrode 8 through a metal layer.
[0031] The first cavity 31 and the second cavity 32 are both annular, and the inner ring edges of the two cavities are both in communication with the cavity for accommodating the fuse, so that the molten material enters the two cavities after the fuse is fused, and the two cavities both have a certain height to form a cavity. The first cavity 31 is located above the second cavity 32 and receives the fuse that is fused at the upper part and the lower part respectively. Compared with the case where one cavity is provided, the two cavities of the utility model can quickly collect molten material and prevent the molten material from flowing into one cavity to cause accumulation, so as to quickly form an open circuit. The volume of the first cavity 31 is greater than that of the second cavity 32, which can accommodate more molten material and facilitate the rapid flow of molten material to quickly form an open circuit.
[0032] In addition, a plurality of cavities can be arranged according to the cross-sectional size and height of the fuse, and the plurality of cavities are arranged in sequence from high to low, which can receive molten material at different positions at different heights and facilitate the rapid formation of an open circuit.
[0033] In other embodiments, each cavity is connected by a channel, so that the molten material accumulated in the upper cavity can flow downward, improving the volume utilization rate of the cavity (not shown).
[0034] When the current is too large, the fuse is heated, the temperature reaches the melting point of the fuse, the fuse is fused, the melt flows into the first cavity 31 and the second cavity 32, and the two cavities can respectively receive the upper and lower segments of the melt, the upper segment enters the first cavity 31 after being fused, and the lower segment enters the second cavity 32, so that the melt can be well accommodated, an open circuit is quickly formed, and accumulation of the melt is prevented to still form a loop.
[0035] The outer ring 312 of the first cavity 31 is lower than the inner ring 311 of the first cavity 31, and a collecting groove 313 is formed at both ends of the first cavity 31, so that the melt flows downward, an open circuit is quickly formed, the air cavity 33 is higher than the inner ring of the first cavity 31, and there is a height difference of L1, so that the gas generated by the fuse is stored in the air cavity.
[0036] The first cavity 31 and the second cavity 32 are respectively provided with a sunken collecting groove 313 at both ends, so that the melt can quickly flow to the place under the action of gravity, and an open circuit is quickly formed.
[0037] The air cavity 33 is a convex structure on the inner ring of the first cavity 31, and is convenient for storing gas.
[0038] In order to better handle the gas generated by the fuse, the utility model also provides a gas channel for handling the gas.
[0039] Figure 2 It is a cross-sectional view of the gas channel, and the ceramic sheet 3 is also provided with a gas channel 34, the inner end of the gas channel 34 is connected with the fuse 6, and the outer end is connected with the outside. The gas generated by the fuse enters the gas channel and is discharged to the outside, so that the gas is prevented from accumulating in the inside and causing explosion.
[0040] The gas channel 34 comprises an upward inclined section 341 and a downward inclined section 342, the upward inclined section 341 and the downward inclined section 342 are connected at an obtuse angle or a right angle, the inner end of the upward inclined section 341 is connected with the fuse 6, and the outer end of the downward inclined section 342 is connected with the outside. The gas first passes through the upward inclined section 341, and the melt flows downward and cannot enter the upward inclined section 341, so that the melt cannot flow to the outside and cannot occupy the space of the gas channel, so that the gas cannot flow. The downward inclined section 342 can make the gas channel form a bending shape, so that the gas channel is conveniently processed.
[0041] The inner end of the ascending inclined section 341 is embedded with a melting column 345, the melting point of the melting column 345 is lower than the melting point of the fuse 6, and the melting column 345 seals the air passage 34. The melting point of the melting column 345 is slightly lower than the melting point of the fuse, when the melting point of the melting column 345 is reached, the fuse is not fused, the melting column 345 is fused, and the melting of the melting column 345 is temporarily accumulated in the ascending inclined section 341, when the melting point of the fuse is reached, the fuse is fused, the melting of the fuse flows to the first cavity 31 quickly, the melting of the melting column 345 flows to the first cavity 31 together with the melting of the fuse, at this time, the ascending inclined section 341 is empty, and the gas generated by the melting enters the air passage.
[0042] Because the gas generated by the fuse when it is just fused is very little, the volume of the melting column 345 is very small, and the gas generated by the melting of the melting column 345 is also very little, so the gas generated before the air passage is opened will not explode.
[0043] The outer end of the descending inclined section 342 is provided with a sealing column 343, the sealing column 343 seals the air passage 34 and prevents dust from entering, and the descending inclined section 342 is in a vacuum state. The two ends of the air passage are sealed by the melting column 345 and the sealing column 343, and the middle region is in a vacuum state. When the melting column 345 is fused and the air passage is opened, because the air passage is in a vacuum state, the gas generated by the melting can enter the air passage in a vacuum state, and under the action of the pressure, the gas generated by the melting can enter the air passage in a vacuum state, and under the action of the pressure, the gas generated by the melting can enter the air passage in a vacuum state.
[0044] The cross section and other parameters of the fuse are set according to the actual required fuse temperature, and the melting column 345 with a suitable melting point is selected. For example, the fuse can be made of a material with a melting point of 253 degrees, and the melting column 345 can be made of PET plastic material with a melting point of about 225-250 degrees. When the temperature reaches 225-250 degrees, the PET plastic is melted, and when the temperature reaches 253 degrees, the fuse is melted.
[0045] The above only describes the preferred embodiments of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification made according to the technical essence of the present application to the above embodiments are within the scope of the technical scheme of the present application.
Claims
1. An over-temperature and over-voltage composite protection device, characterized by: The application relates to a fuse, which comprises a first metal sheet (1) and a second metal sheet (5), a ceramic sheet (3) is arranged between the first metal sheet (1) and the second metal sheet (5), a fuse wire (6) is arranged in the ceramic sheet (3), and the two ends of the fuse wire (6) are in conductive contact with the first metal sheet (1) and the second metal sheet (5) respectively. The ceramic sheet (3) is provided with a first cavity (31) and a second cavity (32), the first cavity (31) is provided with an air cavity (33), and the first cavity (31) and the second cavity (32) are in contact with the fuse wire (6) respectively.
2. The over-temperature and over-voltage composite protection device according to claim 1, characterized in that: The first cavity (31) and the second cavity (32) are annular, the first cavity (31) is located on the upper side of the second cavity (32), and the volume of the first cavity (31) is larger than that of the second cavity (32).
3. The over-temperature and over-voltage composite protection device according to claim 1, characterized in that: The outer ring of the first cavity (31) is lower than the inner ring of the first cavity (31), and the air cavity (33) is higher than the inner ring of the first cavity (31).
4. The over-temperature and over-voltage composite protection device according to claim 1, characterized in that: The ceramic sheet (3) is further provided with an air channel (34), the inner end of the air channel (34) is connected with the fuse wire (6), and the outer end is connected with the outside.
5. The over-temperature and over-voltage composite protection device according to claim 4, characterized in that: The air channel (34) comprises an ascending inclined section (341) and a descending inclined section (342), the ascending inclined section (341) and the descending inclined section (342) are connected at an obtuse angle or a right angle, the inner end of the ascending inclined section (341) is connected with the fuse wire (6), and the outer end of the descending inclined section (342) is connected with the outside.
6. The over-temperature and over-voltage composite protection device according to claim 5, characterized in that: The inner end of the ascending inclined section (341) is embedded with a melting column (345), the melting point of the melting column (345) is lower than that of the fuse wire (6), and the melting column (345) seals the air channel (34).
7. The over-temperature and over-voltage composite protection device according to claim 6, characterized in that: The outer end of the descending inclined section (342) is provided with a sealing column (343), and the sealing column (343) seals the air channel (34).
8. The over-temperature and over-voltage composite protection device according to claim 7, characterized in that: The descending inclined section (342) is a vacuum.
9. The over-temperature and over-voltage composite protection device according to claim 1, characterized in that: The first cavity (31) and the second cavity (32) are respectively provided with sunken collecting grooves at the two ends.
10. The over-temperature and over-voltage composite protection device according to claim 3, characterized in that: The air cavity (33) is a convex structure on the inner ring of the first cavity (31).