Novel thermal protection transient voltage suppressor

Abstract

The present application provides a novel thermal protection transient voltage suppressor, comprising: a housing, and a mounting frame, a TVS component, springs, a sliding block, and a reed which are arranged in the housing; the reed is connected to the TVS component; the sliding block is slidably arranged on the mounting frame; protruding spring rods are arranged on the sliding block and the mounting frame; two ends of each spring are respectively connected to the corresponding spring rod of the sliding block and the corresponding spring rod of the mounting frame; the sliding block abuts against the reed under the tension effect of the springs; limiting bosses are arranged on the inner wall of the housing; the limiting bosses and the side wall of the housing define limiting channels; the spring rods of the mounting frame extend into the limiting channels; and the limiting bosses abut against the springs to limit the springs from disengaging from the spring rods of the mounting frame. The spring rods of the mounting frame are effectively prevented from being softened in the reflow soldering process and causing the springs to be separated, thereby ensuring the performance of the product.

Description

A New Type of Thermal Protection Transient Voltage Suppressor

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] The present invention claims priority to the Chinese patent application with application number 202322035747.8, entitled “A New Type of Thermally Protected Transient Voltage Suppressor”, filed with the Patent Office of China on July 31, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of transient voltage suppressors, and in particular to a novel thermal protection transient voltage suppressor. Background Art

[0004] Transient Voltage Suppressor (TVS) is an overvoltage protection device mainly used to discharge surge current and accurately clamp voltage.

[0005] With the advent of the 5G era, the components on the communication power supply PCB are numerous and compact; compared to other devices, transient voltage suppressors are small and medium-sized devices. The temperature of the conventional high-temperature zone of the transient voltage suppressor during reflow soldering is between 240℃ and 265℃, but the client can also achieve good soldering by reflow soldering other large components on the PCB, often by raising the temperature of the high-temperature section (close to 300℃) to meet the soldering requirements. In this case, the plastic spring column of the transient voltage suppressor (i.e., the spring column of the internal mounting frame) is easily softened and deformed during the reflow soldering of the PCB, and the spring will be out of its predetermined position and lose its elasticity. In an overvoltage state, it will cause the product to trip slowly or fail to trip, and even cause a fire hazard.

[0006] Summary of the Invention

[0007] Therefore, in order to improve the above problems, the present application provides a new type of thermal protection transient voltage suppressor.

[0008] To achieve the above objectives, the technical solutions provided by this application are as follows:

[0009] A novel thermal protection transient voltage suppressor comprises: a housing, a mounting frame disposed within the housing, a TVS component, a spring, a slider, and a spring leaf; the spring leaf is connected to the TVS component; a slidable device for the slider is disposed on the mounting frame, and both the slider and the mounting frame are provided with raised spring columns, with the ends of the spring respectively sleeved on the spring columns of the slider and the mounting frame, and the slider abuts against the spring leaf under the tension of the spring; a limiting boss is provided on the inner wall of the housing, and the limiting boss and the side wall of the housing form a limiting groove, the spring column of the mounting frame extends into the limiting groove, and the limiting boss abuts against the spring to limit the spring from separating from the spring column of the mounting frame.

[0010] Furthermore, there are two springs, which are respectively mounted on both sides of the slider, and the middle portion of the slider abuts against the spring leaf.

[0011] Furthermore, a convex rib is raised on the slider, and the convex rib abuts against the spring.

[0012] Furthermore, an L-shaped mounting portion is formed on the side of the slider, and the mounting portion and the outer side wall of the mounting frame together form a positioning groove, and the spring is assembled in the positioning groove.

[0013] Furthermore, the reed includes a first end, a second end and an abutting section located between the first end and the second end. The first end of the reed is fixed to the mounting frame, and the second end of the reed is connected to the TVS component; the slider abuts against the abutting section of the reed.

[0014] Furthermore, the first end of the spring has a clamping structure and a welding area, the clamping structure is clamped and fixed with the installation frame, and the welding area is used to connect with the patch foot.

[0015] Furthermore, the slider and the second end of the reed are arranged with a gap, preferably, the gap is ≥0.15 mm.

[0016] Furthermore, the shell includes a base plate and a cover, and the base plate and the cover are covered to form a accommodating cavity for accommodating, and the mounting frame, TVS component, spring, slider and reed are all assembled in the accommodating cavity; the TVS component is assembled between the mounting frame and the base plate, the spring, slider and reed are assembled between the mounting frame and the top of the cover, and the limiting boss and limiting groove are formed on the cover.

[0017] Furthermore, the TVS component includes a chip and a positive electrode sheet and a back electrode sheet connected to the chip, the back electrode sheet is connected to the first patch leg, one end of the reed is welded to the positive electrode sheet, and the other end is connected to the second patch leg, and the first patch leg and the second patch leg both extend outside the shell.

[0018] Furthermore, the first patch pin and the second patch pin are both tightly attached to two adjacent surfaces of the housing to form a long path.

[0019] Furthermore, the spring column is provided with a limiting step, and the distance d between the outer end surface of the limiting step and the outer surface of the spring column is ≥0.1 mm.

[0020] Furthermore, the bottom plate is provided with a groove, and the first patch foot and the second patch foot are both provided with a surface-mounted section; a gap is set between the groove and the surface-mounted section, and preferably, the gap is ≥0.03 mm.

[0021] Furthermore, the TVS component includes a chip and a positive electrode sheet and a back electrode sheet connected to the chip. The back electrode sheet extends out of the shell to form a first pin. One end of the spring is connected to the positive electrode sheet, and the other end extends out of the shell to form a second pin.

[0022] The technical solution provided by this application has the following beneficial effects:

[0023] The spring column of the mounting frame extends into the limiting groove of the shell, and the spring is abutted by the limiting boss to limit the spring from separating from the spring column of the mounting frame, thereby preventing the spring column of the mounting frame from softening during the reflow soldering process and causing the spring to separate, thereby ensuring product performance.

[0024] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the following is a brief introduction to the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] FIG1 is a circuit diagram of a novel thermal protection transient voltage suppressor according to an embodiment;

[0027] FIG2 shows the appearance of the novel thermal protection transient voltage suppressor in Example 1;

[0028] FIG3 is an exploded view of the novel thermal protection transient voltage suppressor in Example 1;

[0029] FIG4 is a schematic diagram showing the internal structure of the novel thermal protection transient voltage suppressor in the first embodiment in the energy storage state, with the cover structure hidden;

[0030] FIG5 is a top view of the structure shown in FIG4 ;

[0031] FIG6 is a cross-sectional view of the structure shown in FIG5 along line AA;

[0032] FIG7 is an enlarged schematic diagram of area a in FIG6 ;

[0033] FIG8 is a top view of the novel thermal protection transient voltage suppressor in Example 1;

[0034] FIG9 is a cross-sectional view of line BB in FIG8 ;

[0035] FIG10 is an enlarged schematic diagram of area b in FIG9 ;

[0036] FIG11 is a schematic diagram showing the internal structure of the novel thermal protection transient voltage suppressor in Example 1 after being cut off, with the cover structure hidden;

[0037] FIG12 is a top view of the structure shown in FIG11 ;

[0038] FIG13 is a cross-sectional view of the structure shown in FIG12 along line CC;

[0039] FIG14 is a schematic diagram showing the structure of the reed in Example 1;

[0040] FIG15 is a schematic structural diagram of the slider in the first embodiment;

[0041] FIG16 is a schematic structural diagram of the bottom plate in Example 1;

[0042] FIG17 shows the fixing structure of the mounting frame and the spring in the first embodiment;

[0043] FIG18 is a schematic diagram showing a structure of a spring in the first embodiment;

[0044] FIG19 is a schematic diagram showing another structure of the spring in the first embodiment;

[0045] FIG20 is a schematic diagram showing the internal structure of the novel thermal protection transient voltage suppressor after being cut off in Example 2. Specific embodiments

[0046] To further illustrate various embodiments, this application includes accompanying drawings. These drawings form part of the disclosure and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, those skilled in the art will understand other possible implementations and the advantages of this application. The components in the figures are not drawn to scale, and similar reference numerals are generally used to represent similar components.

[0047] The present application will now be further described with reference to the accompanying drawings and specific implementation methods.

[0048] Example 1

[0049] 1 to 17 , a novel thermal protection transient voltage suppressor provided in this embodiment includes: a housing 100 and a mounting frame 5, a TVS component 6, a spring 2, a slider 4, and a reed 3 disposed within the housing 100; the reed 3 is connected to the TVS component 6, i.e., connected to the TVS component 6 via an alloy 9; the slider 4 is slidably assembled on the mounting frame 5. Specifically, the TVS component 6 is located below the mounting frame 5, and the slider 4 and reed 3 are located above the mounting frame 5. The mounting frame 5 uses non-metallic components to provide insulation and isolation. The slider 4 and the mounting frame 5 are both provided with raised spring columns (i.e., the spring column 401 of the slider 4 and the spring column 501 of the mounting frame 5), and the two ends of the spring 2 are respectively sleeved on the spring column 401 of the slider 4 and the spring column 501 of the mounting frame 5. The slider 4 abuts against the spring plate 3 under the tension of the spring 2 to achieve energy storage; in this way, under the overvoltage state, the TVS component 6 quickly absorbs heat to melt the connection position with the spring plate 3 (such as the melting alloy 9), and the spring 2 releases the elastic force, pulling the slider 4 to slide to drive the spring plate 3 to bounce up quickly, cutting off the arc, thereby completing the effective protection mission.

[0050] The inner wall of the housing 100 is provided with a limiting boss 102. The limiting boss 102 and the side wall of the housing 100 form a limiting groove 101. The spring post 501 of the mounting frame 5 extends into the limiting groove 101. The limiting boss 102 abuts against the spring 2, thereby preventing the spring 2 from separating from the spring post 501 of the mounting frame 5. This effectively prevents the spring post 501 of the mounting frame 5 from softening during the reflow soldering process, thereby preventing the spring 2 from separating. In other words, the spring 2 is unlikely to separate from the spring post 501 of the mounting frame 5, thereby causing the elastic force to fail. The normal operation of the slider 4 and the performance of the product can be guaranteed during operation.

[0051] Specifically, since the slider 4 is movable and cannot restrict its spring column 401 , the slider 4 may be made of a material with a higher melting point to prevent the spring column 401 from softening during the reflow process and causing the spring 2 to detach.

[0052] Furthermore, in this embodiment, there are two springs 2, which are respectively mounted on either side of the slider 4. The middle portion of the slider 4 abuts against the spring 3. Specifically, a rib 402 is raised in the middle portion of the slider 4, and the rib 402 abuts against the spring 3. This arrangement allows the slider 4 to be evenly stressed and more stable.

[0053] Furthermore, to better prevent interference between the spring 2 and the reed 3, L-shaped mounting portions 403 are formed on both sides of the slider 4. These mounting portions 403, together with the outer wall of the mounting frame 5, form positioning slots within which the spring 2 is mounted. This confines the spring 2 within the positioning slots, preventing contact and interference between the spring 2 and the reed 3, and providing improved stability.

[0054] Specifically, for the selection of spring 2, a structure with no straight arms at both ends as shown in FIG18 or a structure with straight arms 21 at both ends as shown in FIG19 can be adopted, or a structure with a straight arm at one end and no straight arm at the other end can be adopted.

[0055] Of course, in other embodiments, the number of the spring 2 may be one, or the slider 4 may not be provided with the rib 402 structure to abut against the reed 3 .

[0056] Furthermore, in this embodiment, the spring column 401 of the slider 4 and the spring column 501 of the mounting frame 5 are both provided with an anti-slip feature. As shown in FIG10 , taking the spring column 501 as an example, the anti-slip feature is a raised limiting step 5011 on the upper end portion of the side away from the spring 2. The spring 2 is sleeved on the spring column 501 and is limited by the limiting step 5011. In this way, the spring 2 can be further fixed and the spring 2 can be prevented from slipping out. Specifically, the raised height d of the limiting step 5011 (i.e., the distance d from the outer end surface of the limiting step to the outer surface of the spring column) is preferably ≥0.1 mm.

[0057] Furthermore, in this embodiment, the reed 3 includes a first end, a second end, and an abutment section 302 located between the first end and the second end. The first end of the reed 3 is fixed to the mounting frame 5, and the second end of the reed 3 is a welding portion 301 directly connected to the TVS component 6; the slider 4 abuts against the abutment section 302 of the reed 3; thereby realizing the assembly of the reed 3.

[0058] Specifically, the first end of the spring 3 has a snap-fit ​​structure 303 and a welding area 304. The snap-fit ​​structure 303 is snap-fitted and fixed to the mounting frame 5. Specifically, the mounting frame 5 is provided with a snap-fit ​​boss 502. The snap-fit ​​structure 303 includes a snap joint 3031 and a limiting side plate 3032. The limiting side plate 3032 is inserted into the mounting frame 5. The snap joint 3031 is snap-fitted and fixed to the snap-fit ​​boss 502. The welding area 304 is used for welding to the patch pin 7. During assembly, the snap-fit ​​structure 303 at the first end of the spring 3 is first snap-fitted and fixed to the mounting frame 5 to position the welding area 304. This can effectively prevent displacement during the welding process. The welding area 304 is then welded.

[0059] At the same time, a gap is provided between the slider 4 and the second end of the reed 3. This prevents heat damage to the slider 4 during welding of the second end of the reed 3 and prevents residual alloy 9 on the reed 3 from jamming the slider 4 and preventing it from being released during overvoltage conditions. Preferably, the gap between the slider 4 and the second end of the reed 3 is ≥0.15 mm.

[0060] Of course, in other embodiments, the structure of the reed 3 and the matching position with the slider 4 are not limited thereto.

[0061] Furthermore, in this embodiment, the housing 100 includes a base plate 8 and a cover 1. The base plate 8 and the cover 1 cover each other to form a housing cavity for accommodating the TVS component 6. The mounting frame 5, TVS component 6, spring 2, slider 4, and reed 3 are all assembled in the housing cavity. The TVS component 6 is assembled between the mounting frame 5 and the base plate 8. The spring 2, slider 4, and reed 3 are assembled between the mounting frame 5 and the top of the cover 1. The limiting boss 102 and limiting groove 101 are formed on the cover 1 to achieve a reasonable layout of the various components. More specifically, the position for accommodating the TVS component 6 (i.e., the space between the mounting frame 5 and the base plate 8) can also be filled with an insulating or isolating material, such as a resin material.

[0062] Furthermore, in this embodiment, the TVS component 6 includes a chip 602 and a positive electrode sheet 601 and a back electrode sheet 603 connected to the chip 602, the back electrode sheet 603 is connected to the first patch foot 71, one end (i.e., the second end) of the reed 3 is connected to the positive electrode sheet 601, and the other end is connected to the second patch foot 72, that is, the second patch foot 72 is connected through the welding area 304 of the first end of the reed 3, and the first patch foot 71 and the second patch foot 72 both extend outside the shell 100, thereby realizing the lead-out of the pins.

[0063] Specifically, in this embodiment, the first patch leg 71 and the second patch leg 72 are both short-path structures, that is, they are relatively short in length. At the same time, the first patch leg 71 and the second patch leg 72 both include a welding section 701 and a surface-mount section 702. The welding section 701 is used for welding connection, and the surface-mount section 702 extends outside the housing 100 and is attached to the surface of the housing 100. As in this specific embodiment, a groove 801 is formed at the bottom of the base plate 8, and the surface-mount section 702 is accommodated in the groove 801. Furthermore, a gap D exists between the surface-mount section 702 and the groove 801 of the base plate 8 to avoid the burr height of the patch legs 7 (i.e., the first patch leg 71 and the second patch leg 72) during the manufacturing process, thereby ensuring the coplanarity between the surface-mount sections 702 of the two patch legs 7. Furthermore, it is preferred that the gap D is ≥ 0.03 mm.

[0064] Example 2

[0065] This embodiment provides a novel thermal protection transient voltage suppressor, which has a structure substantially the same as that provided in the first embodiment, except that: as shown in FIG20 , in this embodiment, the two patch legs 7 (i.e., the first patch leg 71 and the second patch leg 72) are both long path structures. For example, in this embodiment, the two patch legs 7 are tightly attached to two adjacent surfaces of the shell 100 to form a long path. The setting of such a long path can slow down the rate at which heat is transferred to the welding position (such as the welding position of the first patch leg 71 and the back electrode sheet 603 and the welding position of the second patch leg 72 and the reed 3) during client welding, thereby extending the heat transfer time and facilitating the welding of other large components of the client.

[0066] Example 3

[0067] This embodiment provides a novel thermal protection transient voltage suppressor with a structure substantially similar to that of the first embodiment, except that, in this embodiment, independent first and second patch pins 71 and 72 are not added. Instead, corresponding pin structures are integrally extended from the back electrode sheet 603 and the reed 3. Specifically, the back electrode sheet 603 extends outward from the housing 100 to form a first pin, and the first end of the reed 3 extends outward from the housing 100 to form a second pin. The integrally extended pin structure eliminates the need for additional soldering.

[0068] Although the present application has been specifically shown and described in conjunction with preferred embodiments, it should be understood by those skilled in the art that various changes in form and details may be made to the present application without departing from the spirit and scope of the present application as defined by the appended claims, and all such changes are within the scope of protection of the present application.

[0069] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's description and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A novel thermal protection transient voltage suppressor, comprising: A housing and a mounting frame, a TVS component, a spring, a slider and a reed arranged in the housing; The spring sheet is connected to the TVS component; the sliding device of the slider is on the installation frame, and the slider and the installation frame are both provided with raised spring columns, and the two ends of the spring are respectively sleeved on the spring column of the slider and the spring column of the installation frame, and the slider abuts against the spring sheet under the tension of the spring; wherein: the inner wall of the shell is provided with a limiting boss, and the limiting boss and the side wall of the shell form a limiting groove, the spring column of the installation frame extends into the limiting groove, and the limiting boss abuts against the spring to limit the spring from separating from the spring column of the installation frame.

2. The novel thermal protection transient voltage suppressor according to claim 1, wherein: The number of the springs is two, and the two springs are respectively assembled on both sides of the slider, and the middle position of the slider abuts against the spring leaf.

3. The novel thermal protection transient voltage suppressor according to claim 1 or 2, wherein: A convex rib is protruded from the sliding block, and the convex rib abuts against the spring sheet.

4. The novel thermal protection transient voltage suppressor according to claim 1 or 2, wherein: The reed includes a first end, a second end and a contact section between the first end and the second end. The first end of the reed is fixed to the mounting frame, and the second end of the reed is connected to the TVS component. The slider contacts the contact section of the reed.

5. The novel thermal protection transient voltage suppressor according to claim 4, wherein: The first end of the spring sheet has a clamping structure and a welding area, the clamping structure is clamped and fixed with the installation frame, and the welding area is used to connect with the patch foot.

6. The novel thermal protection transient voltage suppressor according to claim 4, wherein: The slider is arranged with a gap between the second end of the reed.

7. The novel thermal protection transient voltage suppressor according to claim 1, wherein: The shell includes a base plate and a cover, the base plate and the cover are covered to form a housing cavity for accommodating, the mounting frame, the TVS component, the spring, the slider and the reed are all assembled in the housing cavity; the TVS component is assembled between the mounting frame and the base plate, the spring, the slider and the reed are assembled between the mounting frame and the top of the cover, and the limiting boss and the limiting groove are formed on the cover.

8. The novel thermal protection transient voltage suppressor according to claim 7, wherein: The TVS component includes a chip and a positive electrode sheet and a back electrode sheet connected to the chip, the back electrode sheet is connected to the first patch foot, one end of the reed is connected to the positive electrode sheet, and the other end is connected to the second patch foot, and the first patch foot and the second patch foot both extend out of the shell.

9. The novel thermal protection transient voltage suppressor according to claim 8, wherein: The first patch foot and the second patch foot are both tightly attached to two adjacent surfaces of the housing to form a long path.

10. The novel thermal protection transient voltage suppressor according to claim 1, wherein: The spring column is provided with a limiting step, and the distance d from the outer end surface of the limiting step to the outer surface of the spring column is ≥0.1 mm.

11. The novel thermal protection transient voltage suppressor according to claim 8, wherein: The bottom plate is provided with a groove, and the first patch foot and the second patch foot are both provided with a surface-mounted section; the groove and the surface-mounted section are arranged with a gap.

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