Over-current and over-voltage composite protection element
By introducing a metal support fusion structure and a ceramic plate cavity partition design into the TVS/TSS chip, the protection problem of the chip under high current and high pressure is solved, achieving stable open circuit and safe protection.
Patent Information
- Application Number
- CN202423236363.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-12-26
AI Technical Summary
Existing TVS/TSS chips are prone to damage when exposed to high currents, resulting in circuit burnout, and lack effective protection design.
A metal support is used as the molten material, which melts and forms an open circuit when the chip is overcurrent or overvoltage. The molten material is isolated by the cavity and partition structure of the ceramic sheet, forming a stable open circuit protection.
It effectively protects the chip from damage, ensures circuit safety, extends service life, and prevents molten material from reforming into a circuit.
Smart Images
Figure CN223651410U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to overcurrent protection devices, specifically a composite overcurrent and overvoltage protection element. Background Technology
[0002] TVS / TSS chips are designed to protect against overcurrent, but there are very few designs on the market that protect the TVS / TSS chips themselves. If the circuit has a current that exceeds the TVS / TSS chip's capacity, it will damage the TVS / TSS chip itself, making the entire circuit prone to burning out. Utility Model Content
[0003] To address the shortcomings of the existing technology, this invention provides a composite overcurrent and overvoltage protection component. This invention uses the chip's metal support as the molten element, resulting in a compact structure. It can promptly melt and open the circuit when the chip experiences overcurrent or overvoltage causing a temperature rise, providing excellent performance and protecting the chip's own safety.
[0004] To achieve the above technical objectives, this utility model adopts the following technical solution: an overcurrent and overvoltage composite protection element, comprising a metal bracket, a metal connecting piece, a silicon chip, and a copper electrode connected in sequence. The metal bracket includes a connecting section and a support section. The connecting section is connected to the metal connecting piece. One end of the support section is connected to the connecting section, and the other end extends outward. The support section has at least one narrow strip along its length, and the width of the narrow strip is smaller than the width of the metal bracket. It also includes a ceramic sheet. The ceramic sheet has a receiving hole inside to accommodate the metal bracket. The ceramic sheet has a cavity located below the narrow strip.
[0005] Transition sections are provided at both ends of the narrow band.
[0006] It also includes a ceramic sheet with a receiving hole inside for accommodating the metal bracket. The connecting segment is connected to the metal connecting piece at one port of the receiving hole, and the bracket segment extends outward at the other port of the receiving hole.
[0007] The ceramic sheet has a cavity for accommodating the molten material after the narrow strip is melted. The size of the cavity is larger than the size of the narrow strip, and the cavity can completely cover the narrow strip.
[0008] A partition is provided inside the cavity to separate the molten material after the narrow band is melted, thus forming an open circuit.
[0009] The two sides and one bottom edge of the partition are respectively connected to the side and bottom edge of the cavity. The top of the partition is directly opposite the midpoint of the narrow strip and does not contact the narrow strip.
[0010] The top two sides of the partition are respectively provided with slopes so that the top is a sharp angle.
[0011] The partition has recessed structures on both sides.
[0012] The partitions are in a grid pattern.
[0013] It also includes a heat sink, with the copper electrode positioned above the heat sink.
[0014] The connecting segment of the metal bracket is connected to the metal connecting piece at one port of the receiving hole, and the bracket segment extends outward at the other port of the receiving hole.
[0015] In summary, this utility model achieves the following technical effects:
[0016] This invention sets a fusible structure on the original metal support of the chip, which can form a fuse function. When the temperature is too high, the narrow band is melted to form an open circuit.
[0017] This invention features a cavity to accommodate molten material and a partition to isolate the molten material, preventing the molten metal from forming a loop again. Attached Figure Description
[0018] Figure 1 It is a composite overcurrent and overvoltage protection component;
[0019] Figure 2 This is a planar schematic diagram of the metal bracket 1;
[0020] Figure 3 This is a cross-sectional diagram showing the addition of ceramic plates;
[0021] Figure 4 This is a schematic diagram of the partition. Detailed Implementation
[0022] The present invention will be further described in detail below with reference to the accompanying drawings.
[0023] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.
[0024] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0027] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0028] Example:
[0029] Figure 1It is an overcurrent and overvoltage composite protection component, including a metal bracket 1, a metal connecting piece 2, a silicon chip 3, a copper electrode 4, and a heat sink 5 connected in sequence. The metal bracket 1 includes a connecting section 11 and a bracket section 12. The connecting section 11 is connected to the metal connecting piece 2. One end of the bracket section 12 is connected to the connecting section 11, and the other end extends outward. The bracket section 12 is provided with at least one narrow strip 13 along its length direction. The width of the narrow strip 13 is smaller than the width of the metal bracket 1.
[0030] Metal bracket 1 is made of copper sheet, and metal connecting piece 2 is made of copper sheet.
[0031] The copper electrode 4 is placed above the heat sink 5 to facilitate timely heat dissipation and extend the service life of the protective components.
[0032] Figure 2 This is a schematic diagram of the metal bracket 1. The thickness and width of the narrow band 13 are selected according to the actual current.
[0033] When the voltage or current is too high and the temperature rises, if the temperature reaches the melting point of the metal support 1, the narrow band 13 will melt quickly due to its narrowness, forming an open circuit and protecting the chip itself.
[0034] The narrow band 13 is provided with transition sections 14 at both ends. The transition sections 14 can be inclined structures, right angles, arcs, or irregular shapes, etc., to enhance the tightness of the connection between the narrow band and the support body.
[0035] Figure 3 This is a cross-sectional view showing the addition of a ceramic sheet 6. The ceramic sheet 6 has an internal receiving hole 61 for accommodating the metal support 1. The connecting segment 11 connects to the metal connecting piece 2 at one end of the receiving hole 61, and the support segment 12 extends outward at the other end of the receiving hole 61. This invention places the metal support 1 inside the ceramic sheet 6, providing better protection.
[0036] The ceramic sheet 6 has a cavity 62 positioned below the narrow strip 13 to accommodate the molten material after the narrow strip 13 melts. The cavity 62 is larger than the narrow strip 13 and can completely cover it. A partition 7 is provided inside the cavity 62 to separate the molten material after the narrow strip 13 melts, thus creating an open circuit. The number of partitions 7 can be set as needed.
[0037] When the narrow band 13 melts, the molten material drips into the cavity 62 below, which can quickly break the circuit and form an open circuit.
[0038] Figure 4This is a schematic diagram of a partition. The two sides and one bottom edge of the partition 7 are connected to the sides and bottom edge of the cavity 62, respectively. The top of the partition 7 is directly opposite the midpoint of the narrow strip 13 and does not contact the narrow strip 13, which allows it to uniformly accommodate the molten material without damaging the copper sheet. The top two sides of the partition 7 are provided with slopes 23, making the top a sharp angle, which better allows the molten material to flow into the cavity and prevents it from accumulating at the top. The partition can divide the cavity into two or more spaces, each capable of accommodating the molten material on both sides, preventing the molten material from contacting each other in the cavity, and enabling rapid and thorough formation of an open circuit. In other embodiments, the two sides of the partition 7 may have recessed structures to increase the surface area on which the molten material can adhere.
[0039] Working principle:
[0040] like Figure 1 As shown, when the current and voltage are too high and the temperature is too high, the narrow band 13 melts, and the connecting section 11 and the bracket section 12 are disconnected to form an open circuit.
[0041] like Figure 3 As shown, when the narrow band 13 melts, the cavity 62 below can store the molten material of the narrow band 13, and the middle partition 7 can quickly separate the molten material, which is conducive to the rapid formation of an open circuit.
[0042] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall fall within the scope of the technical solution of the present utility model.
Claims
1. A composite overcurrent and overvoltage protection element, comprising a metal bracket (1), a metal connecting piece (2), a silicon chip (3), and a copper electrode (4) connected in sequence, wherein the metal bracket (1) includes a connecting section (11) and a bracket section (12), the connecting section (11) being connected to the metal connecting piece (2), and one end of the bracket section (12) being connected to the connecting section (11) and the other end extending outward, characterized in that: The support segment (12) is provided with at least one narrow strip (13) along its length, the width of the narrow strip (13) being less than the width of the metal support (1); it also includes a ceramic sheet (6), the ceramic sheet (6) having a receiving hole (61) inside for receiving the metal support (1), the ceramic sheet (6) having a cavity (62) located below the narrow strip (13).
2. The overcurrent and overvoltage composite protection element according to claim 1, characterized in that: Transition sections (14) are provided at both ends of the narrow band (13).
3. The overcurrent and overvoltage composite protection element according to claim 1, characterized in that: The cavity (62) is larger than the narrow band (13) and the cavity (62) can completely cover the narrow band (13).
4. The overcurrent and overvoltage composite protection element according to claim 3, characterized in that: A partition (7) is provided inside the cavity (62) to separate the molten material after the narrow band (13) is melted, thereby forming an open circuit.
5. The overcurrent and overvoltage composite protection element according to claim 4, characterized in that: The two sides and one bottom edge of the partition (7) are respectively connected to the side and bottom edge of the cavity (62). The top of the partition (7) is directly opposite the midpoint of the narrow strip (13) and does not contact the narrow strip (13).
6. The overcurrent and overvoltage composite protection element according to claim 4, characterized in that: The top two sides of the partition (7) are respectively provided with ramps (23) so that the top is a sharp angle.
7. The overcurrent and overvoltage composite protection element according to claim 4, characterized in that: The partition (7) has recessed structures on both sides.
8. The overcurrent and overvoltage composite protection element according to claim 4, characterized in that: The partition (7) is in the shape of a grid.
9. The overcurrent and overvoltage composite protection element according to claim 1, characterized in that: It also includes a heat sink (5), with the copper electrode (4) positioned above the heat sink (5).
10. The overcurrent and overvoltage composite protection element according to claim 1, characterized in that: The connecting segment (11) of the metal bracket (1) is connected to the metal connecting piece (2) at one port of the receiving hole (61), and the bracket segment (12) extends outward at the other port of the receiving hole (61).