Power supply module surge protector

Abstract

The utility model relates to a surge protector for a power supply module, and belongs to the technical field of lightning protection. The power supply module surge protector comprises a bare chip TVS, a plastic package seat, a tripping electrode and a tripping assembly. The bare chip TVS is provided with a first pin and a reserved bare electrode; the plastic package seat wraps the bare chip TVS through injection molding, and the first pin and the reserved bare electrode are exposed; the first end of the tripping electrode and the reserved bare electrode are soldered to form a soldering point, and the second end is a second pin; the tripping assembly is located between the plastic package seat and the tripping electrode, can be inserted into the separated welding point, and is used for covering the welding point and separating the first end of the tripping electrode from the reserved bare electrode. According to the power supply module surge protector provided by the utility model, when the bare chip TVS fails, the welding point of the tripping electrode and the bare chip electrode can be quickly disconnected so as to be separated from a main circuit, fire combustion caused by continuous heating of the bare chip TVS is avoided, and the safety and reliability of a product can be effectively improved.

Description

Technical Field

[0001] This utility model belongs to the field of lightning protection technology, specifically relating to a power module surge protector. Background Technology

[0002] A transient voltage suppressor (TVS) is a commonly used surge protection component, primarily used to protect electronic circuits. The TVS works by exhibiting a high impedance state under normal operating voltage, but rapidly switching to a low impedance state when encountering a transient overvoltage exceeding its set threshold, thereby discharging the overcurrent to ground and protecting downstream circuitry. Because of its extremely short response time, typically on the nanosecond scale, the TVS is ideally suited for suppressing fast transient overvoltages.

[0003] Currently, the commonly used plastic-encapsulated TVS in the industry can be damaged when the system experiences continuous overvoltage or lightning strikes exceeding specifications. In such cases, the TVS will continue to heat up and ignite, posing a significant safety hazard. Utility Model Content

[0004] Therefore, the purpose of this utility model is to provide a power module surge protector that can quickly disconnect the solder joint between the trip electrode and the bare die electrode when the bare die TVS fails, thereby disconnecting it from the main circuit and preventing fire caused by the continuous heating of the bare die TVS. This can effectively improve the safety and reliability of the product.

[0005] The technical solution of this utility model is as follows:

[0006] This utility model provides a power module surge protector, comprising: a bare TVS with a first pin and a reserved exposed electrode; a molding compound that encapsulates the bare TVS by injection molding, exposing the first pin and the reserved exposed electrode; a trip electrode having a first end soldered to the reserved exposed electrode to form a solder joint and a second end serving as a second pin; and a trip assembly located between the molding compound and the trip electrode and capable of being inserted into the separated solder joint.

[0007] As an optional solution, the molding base is provided with an L-shaped slot, and the tripping electrode includes an L-shaped part and an arc-shaped part connected to each other, with the L-shaped part embedded in the slot.

[0008] As an optional solution, the molding base is provided with a limiting notch, and the end of the arc-shaped portion near the L-shaped portion is limited by the limiting notch.

[0009] As an option, the slot includes a first segment and a second segment, with the second pin embedded in the second segment, and the width of the first segment gradually decreasing in the direction that gradually approaches the second segment.

[0010] As an optional solution, the first end of the tripping electrode is provided with at least one tripping protrusion, which abuts against the reserved exposed electrode.

[0011] As an optional solution, the power module surge protector also includes a cover, which covers the plastic housing and exposes the first pin and the second pin.

[0012] As an optional solution, the molding compound includes a tripping side and a mounting side facing away from each other, the solder joint is located on the tripping side, the first pin and the second pin are located on the mounting side, and the cover encloses the tripping side and its surroundings.

[0013] As an optional solution, wedge-shaped buckles are provided on both sides of the plastic sealing base, and two locking holes are provided inside the box cover, with the wedge-shaped buckles embedded in the locking holes.

[0014] Alternatively, the lock hole is a through hole that extends through the side wall of the lid.

[0015] As an optional solution, the tripping assembly includes an arc-suppressing slider and a tripping spring. The arc-suppressing slider is movably engaged with the molding seat, and the tripping spring causes the arc-suppressing slider to tend to insert into the welding point.

[0016] As an optional solution, the arc-shielding slider can be slidably or rotatably engaged with the molding seat.

[0017] As an optional solution, the molding base is provided with at least two guide rails, and the molding base is provided with guide grooves that cooperate with the guide rails.

[0018] As an optional solution, the arc-shielding slider is provided with a limiting groove, and a portion of the tripping electrode is embedded in the limiting groove.

[0019] As an alternative, the first pin is biased relative to one side of the bare TVS, and the molding socket is provided with a reserved window corresponding to the reserved exposed electrode.

[0020] The beneficial effects of this utility model are:

[0021] The power module surge protector provided by this utility model has the following advantages: 1. By adding a trip electrode and a trip assembly, the trip electrode is soldered to the reserved exposed electrode. When the bare TVS fails, the solder joint can be disconnected and isolated by the trip assembly, effectively improving the safety of the product; 2. The molding die is formed as a whole with the bare TVS through injection molding, with only one trip solder joint. Compared with the multiple solder joints of TVS in the prior art, it can effectively reduce the production time of the product and increase the reliability and consistency of the product. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The above and other objects, features, and advantages of this utility model will become clearer through the drawings. The same reference numerals indicate the same parts in all the drawings. The drawings are not intentionally drawn to scale to actual dimensions; the focus is on illustrating the main idea of ​​this utility model.

[0023] Figure 1 Schematic diagram of the power module surge protector provided in this embodiment of the utility model Figure 1 ;

[0024] Figure 2 Schematic diagram of the power module surge protector provided in this embodiment of the utility model Figure 2 ;

[0025] Figure 3 Schematic diagram of the power module surge protector (without cover) provided in this embodiment of the utility model Figure 1 ;

[0026] Figure 4 Schematic diagram of the power module surge protector (without cover) provided in this embodiment of the utility model Figure 2 ;

[0027] Figure 5 Schematic diagram of the bare TVS structure of the power module surge protector provided in this embodiment of the utility model Figure 1 ;

[0028] Figure 6 Schematic diagram of the bare TVS structure of the power module surge protector provided in this embodiment of the utility model Figure 2 ;

[0029] Figure 7A schematic diagram illustrating the mating relationship between the bare TVS and the molding compound of the power module surge protector provided in this embodiment of the utility model. Figure 1 ;

[0030] Figure 8 A schematic diagram illustrating the mating relationship between the bare TVS and the molding compound of the power module surge protector provided in this embodiment of the utility model. Figure 2 ;

[0031] Figure 9 Schematic diagram of the tripping electrode of the power module surge protector provided in this embodiment of the utility model Figure 1 ;

[0032] Figure 10 Schematic diagram of the tripping electrode of the power module surge protector provided in this embodiment of the utility model Figure 2 ;

[0033] Figure 11 A schematic diagram of the cover of the power module surge protector provided in this embodiment of the utility model.

[0034] Icons: 10-Power module surge protector; 11-Bare TVS; 12-Plastic seal holder; 13-Trip electrode; 14-Trip assembly; 15-Cover; 110-First pin; 111-Reserved exposed electrode; 120-Slot; 121-Limit notch; 122-Guide rail; 123-Wedge buckle; 130-L-shaped part; 131-Arc-shaped part; 132-Trip protrusion; 140-Arc-shielding slider; 141-Trip spring; 142-Guide groove; 143-Limit groove; 150-Lock hole. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0039] Please refer to Figures 1-4 As shown, an embodiment of this utility model provides a power module surge protector 10, which is mainly used for lightning protection.

[0040] The power module surge protector 10 mainly consists of a bare TVS 11, a plastic seal 12, a tripping electrode 13, a tripping assembly 14, and a cover 15, and is generally rectangular in shape. Of course, in other embodiments, the power module surge protector 10 can have other shapes, such as cylindrical or prismatic.

[0041] The following is a detailed description of each component of the power module surge protector 10.

[0042] The shape and size of the bare TVS11 are not limited, such as cylindrical, rectangular block, etc. In this embodiment, please refer to... Figure 5 , Figure 6 As shown, the bare TVS11 includes a body and a first pin 110.

[0043] The main body is roughly rectangular in shape. A reserved exposed electrode 111 is provided on one side of the main body. The reserved exposed electrode 111 can be part of the electrode sheet on one side of the main body or it can protrude outward. The size of the reserved exposed electrode 111 is not limited and a suitable size can be selected according to actual needs.

[0044] The first pin 110 is disposed on one side of the main body. The relative position of the first pin 110 and the reserved exposed electrode 111 is not limited. For example, the reserved exposed electrode 111 and the first pin 110 are located on adjacent sides or opposite sides of the main body.

[0045] The first pin 110 is used for electrical connection with the circuit. The arrangement of the first pin 110 is not limited. The first pin 110 can be flush with or perpendicular to one side of the main body. In this embodiment, the first pin 110 is offset relative to one side of the main body, that is, the first pin 110 is parallel or approximately parallel to one side of the main body. Except for the connection part, there is a certain gap between the first pin 110 and the main body.

[0046] Please combine Figure 7 , Figure 8As shown, the molding compound 12 is used to encapsulate the bare TVS 11. The molding compound 12 is formed integrally with the bare TVS 11 by injection molding, i.e., a TVS semi-finished product. The first pin 110 and the reserved exposed electrode 111 are exposed and not encapsulated by the molding compound 12.

[0047] The structure of the molding base 12 is not limited, such as rectangular block structure, cylindrical structure, irregular shape, etc.

[0048] In this embodiment, the molding base 12 has a tripping side and a mounting side, with the reserved exposed electrode 111 located on the tripping side and the first pin 110 electrode located on the mounting side.

[0049] The first pin 110 electrode may protrude from the mounting side, may be slightly higher than the mounting side, or the outer side of the first pin 110 may be flush with or substantially flush with the mounting side.

[0050] A reserved window can be provided on the tripping side of the plastic seal 12. The reserved window corresponds to the reserved exposed electrode 111, and the reserved exposed electrode 111 is exposed from the reserved window.

[0051] The tripping electrode 13 is mounted on the molding base 12. The material of the tripping electrode 13 is not limited, but it is generally made of a conductive metal. Please refer to... Figure 9 , Figure 10 As shown, the tripping electrode 13 has a first end and a second end.

[0052] The first end is used for soldering with the reserved exposed electrode 111, that is, the first end and the reserved exposed electrode 111 are soldered together using low-temperature solder paste. The solder joint between the first end and the reserved exposed electrode 111 is defined as the solder point: Please refer to... Figure 3 As shown, when the power module surge protector 10 is working normally, the temperature at the solder joint is low, and the solder joint will not detach; please refer to... Figure 4 As shown, when the bare TVS11 fails, the temperature at the solder joint rises, causing the solder joint to separate, that is, the first end of the trip electrode 13 separates from the reserved bare electrode 111.

[0053] The second end of the tripping electrode 13 is a second pin, and the position of the second pin is not limited. For example, the second pin is located on the side or mounting side of the molding compound 12. In this embodiment, the second pin and the first pin 110 are located at the two ends of the same side of the molding compound 12, that is, at the two ends of the mounting side.

[0054] The second pin may protrude from the mounting side, may be slightly higher than the mounting side, or may be flush or substantially flush with the mounting side on the outer side.

[0055] The first pin 110 corresponds to the second pin, which together serve as the two poles of the power module surge protector 10 for connection to the circuit.

[0056] The tripping electrode 13 is not limited in style and can be a sheet structure. In this embodiment, the tripping electrode 13 includes an L-shaped part 130 and an arc-shaped part 131. One end of the L-shaped part 130 is connected to one end of the arc-shaped part 131. The two can be integrally formed or welded, bonded, etc.

[0057] The L-shaped portion 130 is roughly L-shaped, and the bent portion of the L-shaped portion 130 is the second pin.

[0058] The arc-shaped portion 131 is arc-shaped and has a certain degree of elasticity, allowing it to undergo elastic deformation under external force. One end of the arc-shaped portion 131 is soldered to a pre-reserved welding electrode. When soldering, the arc-shaped portion 131 is typically pressed down to cause elastic deformation until one end of the arc-shaped portion 131 contacts the pre-reserved welding electrode, and then soldering is performed. If the solder joint separates due to high temperature, the arc-shaped portion 131 will return to its original shape under its own elastic force, thus moving away from the pre-reserved welding electrode. Of course, in some embodiments, after the solder joint separates due to high temperature, one end of the arc-shaped portion 131 may not move away from the pre-reserved welding electrode, but may separate or be separated under the push of the tripping electrode 13.

[0059] The widths of the L-shaped portion 130 and the arc-shaped portion 131 are not limited; they can be of equal or unequal width. In this embodiment, the width of the L-shaped portion 130 is greater than the width of the arc-shaped portion 131.

[0060] In this embodiment, the first end of the tripping electrode 13 is provided with a tripping protrusion 132. The number of tripping protrusions 132 is not limited and can be one, two, three, etc. The tripping protrusion 132 abuts against the reserved exposed electrode 111. There is a gap between the tripping electrode 13 and the reserved soldering electrode, which can accommodate low-temperature solder paste, resulting in a wider soldering area and a stronger soldering.

[0061] Of course, in other embodiments, the first end of the tripping electrode 13 and the reserved welding electrode can also be matched in other ways. For example, the first end of the tripping electrode 13 and the reserved welding electrode can be attached together, that is, the side of the first end near the reserved welding electrode is a plane, and the reserved welding electrode is also a plane, and the two are attached to each other.

[0062] The connection method between the tripping electrode 13 and the molding base 12 is not limited, such as bonding, snap-fitting, crimping, etc. In this embodiment, the molding base 12 may be provided with a slot 120 and a limiting notch 121.

[0063] The slot 120 can be L-shaped, and the L-shaped part 130 of the trip electrode 13 is embedded in the slot 120. The L-shaped part 130 and the slot 120 are bonded together with adhesive, so that the second pin is flatter.

[0064] The card slot 120 includes a first segment and a second segment, with the second pin embedded in the second segment. The width of the first segment gradually decreases as it approaches the second segment. This arrangement facilitates the insertion of the trip electrode 13 into the card slot 120. In some embodiments, the width of the first segment may be equal at all points.

[0065] The end of the arc-shaped portion 131 near the L-shaped portion 130 is limited by the limiting notch 121, thereby preventing the arc-shaped portion 131 from swaying left and right.

[0066] Of course, in other embodiments, it is also possible to omit the card slot 120 or the limiting notch 121 on the molding base 12.

[0067] The tripping assembly 14 is located between the molding die 12 and the tripping electrode 13. After the solder joint is separated, the tripping assembly 14 can be inserted into the separated solder joint, that is, the tripping assembly 14 is inserted between the first end of the tripping electrode 13 and the reserved exposed electrode 111, thereby completely isolating the first end of the tripping electrode 13 and the reserved exposed electrode 111. "The tripping assembly 14 is inserted into the separated solder joint" means that "the tripping assembly 14 is inserted between the first end of the separated tripping electrode 13 and the reserved exposed electrode 111 to cover the solder joint and separate the first end of the tripping electrode 13 from the reserved exposed electrode 111".

[0068] The structure of the tripping assembly 14 is not limited; in this embodiment, please refer to... Figure 3 , Figure 4 As shown, the tripping assembly 14 includes an arc-blocking slider 140 and a tripping spring 141.

[0069] The arc-suppressing slider 140 is slidably or rotatably engaged with the sealing seat 12, preferably in a sliding engagement. The sliding engagement between the tripping assembly 14 and the sealing seat 12 is not limited. For example, the sealing seat 12 is provided with at least two guide rails 122, and the arc-suppressing slider 140 is provided with a guide groove 142 that engages with the guide rails 122; or the sealing seat 12 is provided with a guide rod, and the arc-suppressing slider 140 is provided with a guide hole, with the guide rod passing through the guide hole.

[0070] If the arc-suppressing slider 140 is rotatably fitted with the sealing base 12, the arc-suppressing slider 140 is rotatably mounted on the sealing base 12 via a rotating shaft, and the arc-suppressing slider 140 can rotate around the rotating shaft.

[0071] The trip spring 141 causes the arc-shielding slider 140 to tend to insert into the welding point, i.e., please combine Figure 3 As shown, if the weld joint is not separated, the trip spring 141 cannot push the arc-suppressing slider 140 to force the weld joint to separate; please refer to... Figure 4As shown, if the solder joint has separated due to factors such as temperature rise, the elastic force of the trip spring 141 will push the arc-shielding slider 140 to insert into the separated solder joint. That is, the trip assembly 14 is inserted between the first end of the separated trip electrode 13 and the reserved exposed electrode 111 to cover the solder joint and separate the first end of the trip electrode 13 from the reserved exposed electrode 111.

[0072] The trip spring 141 can be any type of spring, such as a compression spring, a tension spring, or a torsion spring. The number of trip springs 141 is not limited, such as one, two, or three. In this embodiment, the trip springs 141 are compression springs, and there are two of them. The arc-blocking slider 140 is provided with a blind hole for mounting. The trip spring 141 is located in the blind hole for mounting. One end of the trip spring 141 abuts against the bottom end of the blind hole for mounting, and the other end abuts against the boss of the plastic seal 12.

[0073] In addition, a limiting groove 143 can be provided on the arc-suppressing slider 140. A part of the tripping electrode 13 is embedded in the limiting groove 143. When the arc-suppressing slider 140 slides along the plastic seal 12, the tripping electrode 13 can also be restricted in the limiting groove 143 and will not deflect.

[0074] The cover 15 is placed on the plastic seal 12 to seal the plastic seal 12 and the detachable electrode, but the first pin 110 and the second pin need to be exposed. The first pin 110 and the second pin need to be electrically connected to the circuit.

[0075] Please combine Figure 11 As shown, the shape of the cover 15 is not limited, such as a cylindrical or cuboid shape with one open end. In this embodiment, the cover 15 is cuboid with an opening on one side. The cover 15 can close the tripping side and the surrounding area of ​​the plastic seal 12, leaving only the mounting side exposed. This arrangement ensures that the corresponding parts of the bare TVS 11, plastic seal 12, tripping electrode 13, and tripping assembly 14 are in a closed space, making them less susceptible to external influences. Furthermore, the power module surge protector 10 has an overall rectangular block structure with a relatively flat surface, facilitating production, storage, and installation.

[0076] The connection method between the box lid 15 and the plastic sealing base 12 is not limited. For example, they can be glued, snapped, or fastened. In this embodiment, the following scheme can be adopted, but is not limited to: wedge-shaped buckles 123 are provided on both sides of the plastic sealing base 12. The cross-section of the wedge-shaped buckles 123 can be triangular, right trapezoidal, etc., and the wedge-shaped buckles 123 have bevels. Two locking holes 150 are provided on the inner side of the box lid 15. The locking holes 150 match the wedge-shaped buckles 123, and the wedge-shaped buckles 123 can be embedded in the locking holes 150. In other embodiments, the position or number of wedge-shaped buckles 123 and locking holes 150 can be set as needed. For example, wedge-shaped buckles 123 are provided on all four sides of the plastic sealing base 12, and locking holes 150 are provided at corresponding positions on the inner side of the box lid 15.

[0077] The keyhole 150 can be a through hole or a blind hole. If the keyhole 150 is a through hole, then the keyhole 150 penetrates the side wall of the cover 15.

[0078] The manufacturing method of the power module surge protector 10 provided in this embodiment is as follows:

[0079] Place the bare TVS11 film into the mold;

[0080] A molded part is obtained by injection molding. The molded part covers most of the bare TVS11 die, leaving only the first pin 110 and the reserved welding electrode exposed, thus obtaining a semi-finished TVS.

[0081] The tripping assembly 14 is installed on the plastic seal, that is, the arc-suppressing slider 140 is installed on the plastic seal, the two slide in contact, and the tripping spring 141 abuts against the arc-suppressing slider 140 and the plastic seal respectively.

[0082] The tripping electrode 13 is installed on the molding compound, that is, the L-shaped part 130 of the tripping electrode 13 is embedded in the slot 120 of the molding compound, and the second pin can be flattened by the slot 120 and the fixing adhesive.

[0083] Press the trip electrode 13 to make the first end of the trip electrode 13 abut against the reserved welding electrode, and then weld the two together with low temperature solder paste.

[0084] During the installation of the box cover 15, the wedge buckle 123 has a beveled surface. The wedge buckle 123 and the box cover 15 cooperate to slightly deform the wedge buckle 123 or the box cover 15 until the wedge buckle 123 is inserted into the lock hole 150.

[0085] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A power module surge protector, characterized in that, include: A bare die TVS with a first pin and a reserved exposed electrode; A molding die is used to encapsulate the bare TVS die through injection molding, exposing the first pin and the reserved exposed electrode. The tripping electrode has a first end soldered to the reserved exposed electrode to form a solder joint, and a second end is a second pin. The tripping assembly is located between the molding seat and the tripping electrode and can be inserted into the separated solder joint.

2. The power module surge protector according to claim 1, characterized in that, The molding base is provided with an L-shaped slot, and the tripping electrode includes an L-shaped part and an arc-shaped part that are connected to each other, with the L-shaped part embedded in the slot.

3. The power module surge protector according to claim 2, characterized in that, The molding base is provided with a limiting notch, and the end of the arc-shaped portion near the L-shaped portion is limited by the limiting notch.

4. The power module surge protector according to claim 2, characterized in that, The slot includes a first segment and a second segment, with the second pin embedded in the second segment. The width of the first segment gradually decreases as it approaches the second segment.

5. The power module surge protector according to claim 1, characterized in that, The first end of the tripping electrode is provided with at least one tripping protrusion, which abuts against the reserved exposed electrode.

6. The power module surge protector according to claim 1, characterized in that, The power module surge protector also includes a cover, which covers the plastic housing and exposes the first pin and the second pin.

7. The power module surge protector according to claim 6, characterized in that, The plastic sealing base is provided with wedge-shaped buckles on both sides, and the box cover is provided with two locking holes, in which the wedge-shaped buckles are embedded.

8. The power module surge protector according to claim 1, characterized in that, The tripping assembly includes an arc-suppressing slider and a tripping spring. The arc-suppressing slider is movably engaged with the molding seat, and the tripping spring causes the arc-suppressing slider to tend to insert into the welding point.

9. The power module surge protector according to claim 8, characterized in that, The arc-shielding slider is provided with a limiting groove, and a part of the tripping electrode is embedded in the limiting groove.

10. The power module surge protector according to claim 1, characterized in that, The first pin is biased relative to one side of the bare TVS, and the molding socket is provided with a reserved window corresponding to the reserved exposed electrode.

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