Surge protector suitable for reflow soldering

Abstract

The utility model relates to a surge protector suitable for reflow soldering, and belongs to the technical field of surge protectors. The surge protector suitable for reflow soldering comprises a housing, a machine core and a separation sheet. The shell is provided with a plurality of pins made of heat-resistant metal, the machine core is located in the shell and spaced from the shell, the machine core is provided with an exposed welding electrode, an exposed outer electrode and an exposed monitoring electrode, and one end of the separation piece and the welding electrode are welded in a soldering mode to form a welding point. And the outer electrode, the monitoring electrode and the separating sheet are electrically connected with the corresponding pins respectively. The surge protector suitable for reflow soldering provided by the utility model can be fixed through reflow soldering, has a remote signaling function and a separation function, and can be separated when a machine core fails, so that the surge protector is prevented from firing and burning.

Description

Technical Field

[0001] This utility model belongs to the field of surge protector technology, specifically relating to a surge protector suitable for reflow soldering. 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] Surge protectors typically consist of a housing, a TVS module, a release tab, and a trip assembly. The housing has several pins, and the TVS module and the release tab are electrically connected to the corresponding pins. One end of the release tab is soldered to the TVS module to form a solder joint. The trip assembly can be inserted between the separated release tab and the TVS module, covering the solder joint and separating the two.

[0004] If surge protectors in the existing technology are fixed by reflow soldering, the temperature transfer rate is faster during the reflow soldering process, and the temperature is more easily conducted to the solder joint, causing the solder to melt and resulting in the surge protector malfunctioning. Utility Model Content

[0005] Therefore, the purpose of this utility model is to provide a surge protector suitable for reflow soldering, which can be fixed by reflow soldering and has a remote signaling function.

[0006] The technical solution of this utility model is as follows:

[0007] This utility model provides a surge protector suitable for reflow soldering, including a housing, a core, and a release tab; the housing is provided with a plurality of pins made of heat-resistant metal, the core is located inside the housing and separated from both, the core has an exposed soldering electrode, an external electrode, and a monitoring electrode, one end of the release tab is soldered to the soldering electrode to form a solder joint; the external electrode, the monitoring electrode, and the release tab are respectively electrically connected to the corresponding pins.

[0008] As an optional solution, the pin includes a monitoring pin, and the monitoring electrode is electrically connected to the monitoring pin via a monitoring line made of a heat-resistant metal material.

[0009] As an optional solution, the pin includes two electrode feet, each electrode foot having a positioning notch, and both the release tab and the outer electrode have positioning bends that engage with the positioning notches.

[0010] As an optional solution, the housing is provided with a mounting hole and a mounting step. The pin includes a square part missing a corner, a connecting part and a locking part that are vertically connected to both ends of the square part. One end of the square part passes through the mounting hole and the locking part hooks onto the mounting step.

[0011] As an optional solution, the movement includes a base and a TVS body. A first heat-insulating grid is provided on the inner side of the base, the TVS body is supported on the first heat-insulating grid, and the base and the TVS body are potted together.

[0012] As an optional solution, a second heat-insulating grille is provided between the outer casing and the movement.

[0013] As an option, the housing includes a detachably connected base and a cover, with the pins disposed on the base.

[0014] As an optional solution, the base is provided with buckles on at least two sides, and the mechanism is provided with a locking platform, the buckles hooking onto the locking platform.

[0015] As an optional solution, the base is provided with wedge-shaped blocks on at least two sides, and the outer shell is provided with locking holes, the wedge-shaped blocks engaging with the locking holes.

[0016] As an optional solution, the surge protector also includes a tripping assembly, which includes an arc-suppressing slider and a tripping spring. The arc-suppressing slider is disposed between the mechanism and the release tab, and the tripping spring causes the arc-suppressing slider to tend to insert into the weld point after separation.

[0017] The beneficial effects of this utility model are:

[0018] The surge protector provided by this utility model is suitable for reflow soldering. It can be fixed by reflow soldering and has remote signaling and disconnection functions. It can monitor the status of the surge protector in real time so that it can be alarmed and replaced in time when it is damaged. When the system experiences continuous overvoltage or lightning strike energy exceeds the specification and causes damage to the core, the disconnect piece can be disconnected from the solder joint of the core to prevent the surge protector from catching fire and burning, thereby improving product safety and preventing equipment damage. Attached Figure Description

[0019] 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.

[0020] Figure 1 A schematic diagram of the surge protector provided in this embodiment of the utility model;

[0021] Figure 2 An exploded view of the surge protector provided in this embodiment of the utility model;

[0022] Figure 3 A schematic diagram of the structure of the base of the surge protector provided in this embodiment of the utility model;

[0023] Figure 4 A schematic diagram of the structure of the surge protector cover provided in this embodiment of the utility model;

[0024] Figure 5 A schematic diagram illustrating the mating relationship between the base and pins of the surge protector provided in this embodiment of the utility model. Figure 1 ;

[0025] Figure 6 A schematic diagram illustrating the mating relationship between the base and pins of the surge protector provided in this embodiment of the utility model. Figure 2 ;

[0026] Figure 7 A schematic diagram showing the relationship between the TVS body, the disconnector, and the pins of the surge protector provided in this embodiment of the utility model;

[0027] Figure 8 A schematic diagram of the structure of the first pin of the surge protector provided in this embodiment of the utility model;

[0028] Figure 9 A schematic diagram of the structure of the TVS body of the surge protector provided in this embodiment of the utility model;

[0029] Figure 10 A schematic diagram of the mechanism (before filling) of the surge protector provided in this embodiment of the utility model;

[0030] Figure 11 A schematic diagram of the mechanism (after filling) of the surge protector provided in this embodiment of the utility model;

[0031] Figure 12 A partial structural diagram (without the cover) of the surge protector provided in this embodiment of the utility model;

[0032] Figure 13 A cross-sectional view of a surge protector provided in an embodiment of this utility model.

[0033] Icons: 10-Surge protector; 11-Housing; 14-Mechanism; 15-Disengagement piece; 16-Trip assembly; 110-Base; 111-Mounting hole; 112-Mounting step; 113-Second heat shield; 114-Snap-on; 115-Wedge block; 116-Pin; 120-Cover; 121-Lock hole; 130-Monitoring pin; 131-First electrode pin; 132-Second electrode pin; 133-Unlocked pin; 134-U-shaped part; 135-Connecting part; 136-Locking part; 137-Positioning notch; 140-Base; 141-TVS body; 142-First heat shield; 143-Locking platform; 150-Welding electrode; 151-Outer electrode; 152-Positioning bend; 153-Monitoring electrode; 154-Monitoring line; 160-Arc shielding slider; 161-Trip spring. Detailed Implementation

[0034] 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.

[0035] 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.

[0036] 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.

[0037] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0038] Please refer to Figure 1 , Figure 2As shown, an embodiment of this utility model provides a surge protector 10 suitable for reflow soldering. The surge protector 10 can be fixed by reflow soldering, and the fixing position can be a circuit board, etc. It is mainly used for system lightning protection.

[0039] The surge protector 10 mainly consists of a housing 11, a mechanism 14, a release tab 15, and a tripping assembly 16. The surge protector 10 has a generally rectangular block structure. Of course, in other embodiments, the surge protector 10 can have other shapes, such as cylindrical, prismatic, or irregular shapes.

[0040] The following is a detailed description of each component of the surge protector 10.

[0041] The structure of the outer casing 11 is not limited, but its interior is hollow to form a receiving cavity, which is used to accommodate components such as the mechanism 14, the release plate 15, and the tripping assembly 16; the material of the outer casing 11 is not limited, but is generally made of insulating materials such as plastic; the size of the outer casing 11 is not limited and can be set as needed.

[0042] The outer shell 11 can be a single unit or a split structure. Specifically, the outer shell 11 includes a base 110 and a cover 120, which are detachably connected.

[0043] The detachable connection method between the base 110 and the cover 120 is not limited, such as fastening, snap-fitting, etc. In this embodiment, the following solutions can be adopted, but are not limited to: Please refer to Figures 2-4 As shown, wedge-shaped blocks 115 are provided on both sides of the base 110. The cross-section of the wedge-shaped blocks 115 can be triangular, right trapezoidal, etc., and the wedge-shaped blocks 115 have inclined surfaces. The outer shell 11 is provided with a locking hole 121, which matches the shape and position of the wedge-shaped blocks 115. The locking hole 121 can be a blind hole or a through hole, and the wedge-shaped blocks 115 are engaged with the locking hole 121. When the cover 120 is fastened onto the base 110, the side wall of the cover 120 first contacts the inclined surface of the wedge-shaped blocks 115, and the side wall of the cover 120 will undergo slight elastic deformation until the cover 120 is fastened in place, and the wedge-shaped blocks 115 are embedded in the locking hole 121, completing the assembly.

[0044] In other embodiments, the number of wedge blocks 115 and lock holes 121 can be three, four, etc., and their positions can be selected as needed. For example, wedge blocks 115 are provided around the base 110, and lock holes 121 are provided at corresponding positions on the inner side of the cover 120.

[0045] Please combine Figure 5 , Figure 6As shown, the outer casing 11 is provided with a number of pins. The number of pins can be set as needed. Generally speaking, the number of pins is at least three, such as three, four, five, etc. In this embodiment, the number of pins is four.

[0046] Please combine Figure 7 As shown, the four pins are monitoring pin 130, empty pin 133, and two electrode pins. The two electrode pins are defined as first electrode pin 131 and second electrode pin 132. The arrangement of the four pins is not limited, such as rectangular arrangement, isosceles trapezoidal arrangement, etc.

[0047] At least a portion of the pins are exposed to facilitate soldering and fixing to external circuits. A lightning protection circuit is formed between the first electrode pin 131 and the second electrode pin 132. A remote signaling circuit is formed between the first electrode pin 131 and the monitoring pin 130. The unused pin 133 may not be electrically connected to the mechanism 14, or it may be electrically connected to the mechanism 14 or other structures.

[0048] Both the first electrode pin 131 and the second electrode pin 132 are made of heat-resistant metal material. Heat-resistant metal refers to metal material with good electrical conductivity and low thermal conductivity, including but not limited to bronze, brass, and iron-nickel materials.

[0049] The electrode feet are fixed to the base 110. The connection method between the two is not limited; it can employ existing technologies or the following techniques: Please refer to... Figure 2 , Figure 3 As shown, the outer casing 11 is provided with mounting holes 111 and mounting steps 112. The mounting holes 111 can be blind holes or grooves, or through holes. The mounting steps 112 can be stepped or platform-shaped.

[0050] Please combine Figure 8 As shown, the pin includes a square portion 134, a connecting portion 135, and a locking portion 136, with the connecting portion 135 and the locking portion 136 located at both ends of the square portion 134.

[0051] The rectangular section 134 is used to connect and fix to the base 110. The rectangular section 134 can be square or arc-shaped, with one corner missing. Taking the square section as an example, the rectangular section 134 includes a first segment, a second segment, a third segment, and a fourth segment arranged at an angle. The first and fourth segments are not connected. The lengths of the first and fourth segments can be set as needed, and the angle between adjacent segments is unlimited, such as 80°, 90°, 100°, etc. The base 110 is provided with a slot that matches the rectangular section 134. The cross-section of the slot is approximately columnar and matches the rectangular section 134, allowing the rectangular section 134 to be snapped into the slot.

[0052] The connecting part 135 and the locking part 136 are perpendicularly connected to both ends of the U-shaped part 134, respectively. The connecting part 135 is connected to the first segment and perpendicular to it, and the locking part 136 is connected to the fourth segment and perpendicular to it. The connecting part 135 is used for electrical connection with the release tab 15 or the mechanism 14, etc. The fourth segment passes through the mounting hole 111, and the locking part 136 hooks onto the mounting step 112 of the base 110. The locking part 136 is used to firmly fix the pin to the base 110 and prevent the pin from detaching from the base 110. This configuration can effectively improve the stability and flatness of the pin.

[0053] The movement 14 is located inside the outer casing 11, and there is a gap between the movement 14 and the inner surface of the outer casing 11. "Gap" means that there is a certain gap between them, i.e., there is a heat-insulating cavity between them. The heat-insulating cavity can minimize heat transfer and prevent the movement 14 from overheating due to the outer casing 11 heating up. "Gap" does not mean that the two are completely out of contact, but rather that the contact area is minimized as much as possible. For example, please combine... Figure 3 As shown, in this embodiment, a second heat-insulating grille 113 is provided between the outer shell 11 and the mechanism 14. The second heat-insulating grille 113 can be provided on the inner surface of the base 110 and / or the cover 120, or on the outer surface of the mechanism 14.

[0054] The design of the second heat-insulating grille 113 is not limited. For example, the second heat-insulating grille 113 may have a mesh structure, a square structure, or a back-shaped structure.

[0055] The design of movement 14 can refer to existing technology. In this embodiment, please refer to... Figures 9-11 As shown, the movement 14 includes a base 140 and a TVS body 141. A first heat-insulating grille 142 is provided on the inner side of the base 140, and the TVS body 141 is supported on the first heat-insulating grille 142. The style of the first heat-insulating grille 142 is not limited; for example, the first heat-insulating grille 142 is a mesh structure, a square structure, a back-shaped structure, etc. Of course, in other embodiments, it is also possible that the first heat-insulating grille 142 is not provided inside the base 140.

[0056] The base 140 and the TVS body 141 are encapsulated to form a whole. The encapsulation material is not limited, but generally a non-conductive heat insulation material is required.

[0057] The encapsulated mechanism 14 has exposed welding electrodes 150, external electrodes 151 and monitoring electrodes 153. One end of the release tab 15 is soldered to the welding electrode 150 by low-temperature solder paste to form a solder joint. The external electrode 151, monitoring electrode 153 and release tab 15 are electrically connected to the corresponding pins, as follows.

[0058] The monitoring electrode 153 and the monitoring pin 130 are electrically connected via a monitoring wire 154, which is made of a heat-resistant metal material. The monitoring wire 154 is an electrical wire with a small diameter. Generally, the smaller the cross-sectional area of ​​the monitoring wire 154, the better, provided that it meets the requirements for mechanical strength and conductivity. "Meeting the mechanical strength requirements" means that the monitoring wire 154 will not break when a force not exceeding a preset threshold is applied to it. Because the monitoring wire 154 uses a special heat-resistant material and has a small cross-sectional area, during reflow soldering, heat from the monitoring pin 130 is difficult to transfer to the core 14 or the solder joints through the monitoring wire 154, ensuring that the core 14 will not overheat and the solder joints will not detach.

[0059] Both electrode feet are provided with positioning notches 137, which can be semi-circular, strip-shaped, etc. Both the release tab 15 and the outer electrode 151 are provided with positioning bends 152, which can be block-shaped, sheet-shaped, etc. One end of the release tab 15 is welded to the connecting portion 135 of the first electrode foot 131, and one end of the outer electrode 151 is welded to the connecting portion 135 of the second electrode foot 132. The positioning bends 152 are engaged within the positioning notches 137. The positioning notches 137 and the positioning bends 152 cooperate to ensure a tight fit between the first electrode foot 131 and the release tab 15, and a tight fit between the second electrode foot 132 and the outer electrode 151. In other embodiments, the positioning notches 137 are not provided on the electrode feet, and one end of the release tab 15 and the outer electrode 151 are welded to the connecting portion 135 of the corresponding electrode foot.

[0060] Generally, to prevent the movement 14 from wobbling inside the housing 11, the movement 14 needs to be fixed to the housing 11. The fixing method is not limited; in this embodiment, the following scheme can be used, but is not limited to: At least two sides of the base 110 are provided with latches 114, which are capable of elastic deformation. One end of the latches 114 is provided with a wedge-shaped portion. The movement 14 is provided with a locking platform 143, and the wedge-shaped portion can hook onto the locking platform 143, thereby fixing the movement 14 and the base 110. The top of the wedge-shaped portion is a slope. When installing the movement 14 into the base 110, it is only necessary to install the movement 14 from the top of the base 110. The movement 14 can press and deform the latches 114 outward along the slope of the wedge-shaped portion until the movement 14 is inserted into the base 110, at which point the wedge-shaped portion returns to its original position and hooks onto the locking platform 143. In other embodiments, the movement 14 is not connected to the base 110 or the cover 120, but the base 110 and the cover 120 clamp and fix the movement 14.

[0061] The structure of the tripping assembly 16 is not limited and can refer to existing technologies. Please combine it with... Figure 12 , Figure 13 As shown, in this embodiment, the tripping assembly 16 includes an arc-blocking slider 160 and a tripping spring 161.

[0062] The arc-suppressing slider 160 and the mechanism 14 are either in a sliding or rotating fit, preferably in a sliding fit. The sliding fit between the tripping assembly 16 and the mechanism 14 is not limited. For example, the mechanism 14 is provided with two guide rods and the arc-suppressing slider 160 is provided with a through hole that mates with the guide rail, or the mechanism 14 is provided with two guide rails and the arc-suppressing slider 160 is provided with a groove that mates with the guide rail.

[0063] If the arc-shielding slider 160 and the movement 14 are coupled by a rotational engagement, the structure can be as follows: the arc-shielding slider 160 is rotatably mounted on the movement 14 via a rotating shaft, and the arc-shielding slider 160 can rotate around the rotating shaft.

[0064] The release spring 161 can be any type of spring, such as a compression spring, a tension spring, or a torsion spring. The number of release springs 161 is not limited, such as one, two, or three. In this embodiment, the release springs 161 are tension springs, and there are two of them. The two ends of the release springs 161 are connected to the mechanism 14 and the arc-blocking slider 160, respectively.

[0065] The trip spring 161 causes the arc-shielding slider 160 to tend to insert into the separated weld joint. That is, if the weld joint is not separated, the trip spring 161 cannot push the arc-shielding slider 160 to force the weld joint to separate; if the weld joint has already separated due to reasons such as temperature rise, the elastic force of the trip spring 161 will push the arc-shielding slider 160 to insert into the separated weld joint. "The arc-shielding slider 160 inserts into the separated weld joint" means that the arc-shielding slider 160 is inserted between one end of the separated release piece 15 and the welding electrode 150, covering the weld joint and separating the two.

[0066] 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 surge protector suitable for reflow soldering, characterized in that, The device includes a housing, a mechanism, and a release tab. The housing has a plurality of pins made of heat-resistant metal. The mechanism is located inside the housing and separated from it. The mechanism has exposed welding electrodes, an external electrode, and a monitoring electrode. One end of the release tab is soldered to the welding electrodes to form a solder joint. The external electrode, the monitoring electrode, and the release tab are electrically connected to the corresponding pins.

2. The surge protector for reflow soldering according to claim 1, characterized in that, The pin includes a monitoring pin, and the monitoring electrode is electrically connected to the monitoring pin via a monitoring line made of a heat-resistant metal material.

3. The surge protector for reflow soldering according to claim 1, characterized in that, The pin includes two electrode feet, each electrode foot having a positioning notch. Both the release tab and the outer electrode have positioning bends that engage with the positioning notches.

4. The surge protector for reflow soldering according to claim 1, characterized in that, The housing is provided with mounting holes and mounting steps. The pin includes a square part missing a corner, and a connecting part and a locking part that are vertically connected to both ends of the square part. One end of the square part passes through the mounting hole and the locking part hooks onto the mounting step.

5. The surge protector for reflow soldering according to claim 1, characterized in that, The mechanism includes a base and a TVS body. A first heat-insulating grid is provided on the inner side of the base, and the TVS body is supported on the first heat-insulating grid. The base and the TVS body are encapsulated.

6. The surge protector for reflow soldering according to claim 1, characterized in that, A second heat-insulating grille is provided between the outer casing and the mechanism.

7. The surge protector for reflow soldering according to claim 1, characterized in that, The housing includes a detachably connected base and a cover, with the pins disposed on the base.

8. The surge protector for reflow soldering according to claim 7, characterized in that, The base is provided with buckles on at least two sides, and the mechanism is provided with a locking platform, the buckles hooking onto the locking platform.

9. The surge protector for reflow soldering according to claim 7, characterized in that, The base has wedge-shaped blocks on at least two sides, and the outer shell has locking holes, with the wedge-shaped blocks engaging with the locking holes.

10. The surge protector for reflow soldering according to claim 1, characterized in that, The surge protector also includes a tripping assembly, which includes an arc-suppressing slider and a tripping spring. The arc-suppressing slider is disposed between the mechanism and the release tab, and the tripping spring causes the arc-suppressing slider to tend to insert into the weld point after separation.

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