Overpower protection device of switching power supply

Abstract

An overpower protection device of a switching power supply belongs to the technical field of power switches and comprises a cabinet body, a box body is fixedly connected to the inner wall of the cabinet body, wiring terminals are fixedly installed at the two ends of the box body in a penetrating mode, and a protection mechanism is arranged on the inner wall of the box body so as to automatically protect the end portions of the wiring terminals when the device is overpower. The protection mechanism comprises a plurality of terminal protection covers, sliding grooves are formed in the inner walls of the terminal protection covers, ventilation mechanisms are arranged on the inner walls of the sliding grooves, ventilation and heat dissipation are automatically conducted on the interiors of the terminal protection covers, combination is completed through quick response of the two terminal protection covers, protection of the wiring terminals is automatically achieved, and the safety of the wiring terminals is improved. According to the utility model, the wiring terminal can be protected from being accidentally contacted with other elements or conductors, thereby preventing short circuit and electric shock risks, blocking dust and foreign matters, reducing end corrosion and electric leakage, prolonging the service life of equipment, protecting the wiring terminal through intelligent real-time triggering, and improving the safety of the equipment when overpower occurs.

Description

Technical Field

[0001] The present invention relates to the technical field of power switches, and in particular to an overpower protection device for a switching power supply. Background Art

[0002] A switching power supply, also known as an exchange power supply or switching converter, is a power supply that uses high-frequency switching technology to efficiently convert AC to DC power. It converts this power to the voltage or current required by the user through various architectures. By utilizing modern power electronics technology to control the on- and off-time ratio of the switch tube, a stable output voltage is maintained. With the development and innovation of power electronics technology, switching power supply technology is also constantly innovating and is widely used in various fields.

[0003] As a digital upgrade of the traditional power system, the smart grid achieves efficient energy allocation and supply-demand balance by integrating advanced communication, sensing, computing and control technologies. The switching power supply is a core component of smart grid technology and one of the core parts for stable operation. During use, more attention should be paid to the over-power protection function. Through real-time monitoring and rapid response, it plays a key role in improving the reliability of the smart grid, ensuring equipment safety, and optimizing energy utilization.

[0004] For example, the switching power supply with overheating self-protection disclosed in Chinese patent CN202022866289.9, the switching power supply protection device disclosed in CN202320456863.4, the switching power supply protection device disclosed in CN202320104724.5, and the switching power supply protection device disclosed in CN202421505429.1 are all power switch-related protection devices.

[0005] Therefore, during the use of the switching power supply, overpower may occur. Generally, the fuse is blown to trigger the disconnection of the transmission between the power supply and the switch. However, current is still flowing at the end of the power output line. The current will generate a magnetic field, which may cause the adsorption of some substances in the air. The adsorbed substances may adhere to the end of the power output line, reducing the insulation performance of the circuit, and may cause a short circuit or leakage, thereby causing smart grid equipment failure or safety accidents. Summary of the Invention

[0006] The purpose of the present invention is to solve the problem raised in the background technology and to propose an overpower protection device for a switching power supply.

[0007] To achieve the above object, the present invention adopts the following technical solution: an overpower protection device for a switching power supply, comprising a cabinet, an inner wall of which is fixedly connected to a box, and both ends of the box are penetrated by fixedly installed wiring terminals;

[0008] The inner wall of the box is provided with a protection mechanism to automatically protect the ends of the terminal blocks when overpower occurs in the device;

[0009] The protection mechanism includes a plurality of terminal protection covers, the inner walls of the plurality of terminal protection covers are provided with a slide groove, and the inner walls of the slide groove are provided with a ventilation mechanism to automatically ventilate and dissipate heat inside the terminal protection cover when the inside of the terminal protection cover is overheated;

[0010] The ventilation mechanism includes several locking rings, each of which has a through slot extending therethrough. The inner wall of the through slot is provided with a ventilation mechanism to improve the air circulation effect when ventilating and dissipating heat inside the terminal protection cover.

[0011] Furthermore, the protective mechanism includes two sliding plates, a tension spring is fixedly connected between the two sliding plates, a plurality of first springs are fixedly connected to the inner wall of the box body, and the ends of the plurality of first springs away from the box body are fixedly connected to the side wall of the terminal protection cover, the side wall of the terminal protection cover is fixedly connected to a fixed block, and the inner wall of the fixed block is slidably connected to two sliding blocks, a third spring is fixedly connected between the two sliding blocks, a slot is provided on the side wall of the terminal protection cover, and the outer wall of the third spring corresponds to the inner wall of the slot.

[0012] Furthermore, the outer wall of the sliding plate is slidably connected to the inner wall of the box, the outer wall of the terminal protection cover is slidably connected to the inner wall of the box, and a fuse is fixedly installed between the two sliding plates.

[0013] Furthermore, the ventilation mechanism includes a fixed rod, the interior of the locking ring is slidably connected to the outer wall of the fixed rod, the bottom of the locking ring is fixedly connected to a second spring, the inner wall of the through groove is slidably connected to a sealing block, and the top of the sealing block is rotatably connected to a shape memory alloy, the end of the shape memory alloy away from the sealing block is fixedly connected to a fixing plate, and the bottom of the fixing plate is fixedly connected to an extrusion rod, the bottom of the sealing block is provided with a tooth groove, one end of the locking ring is fixedly connected to a protrusion, and the other end of the locking ring is provided with a groove.

[0014] Furthermore, both ends of the fixing rod are fixedly connected to the inner wall of the slide groove, the end of the second spring away from the locking ring is fixedly connected to the inner wall of the slide groove, the top of the fixing plate is fixedly connected to the inner wall of the slide groove, the end of the extrusion rod away from the fixing plate corresponds to the side wall of the shape memory alloy, the outer wall of the protrusion corresponds to the inner wall of the groove, and the inner wall of the locking ring corresponds to the outer wall of the terminal.

[0015] Furthermore, the ventilation mechanism includes a first rotating shaft, and the outer wall of the first rotating shaft is fixedly connected to a gear, the inner wall of the through groove is fixedly connected to a mounting ring, and the inner wall of the mounting ring is rotatably connected to a second rotating shaft, the outer wall of the second rotating shaft is fixedly installed with fan blades, the inner wall of the through groove is fixedly installed with a winding assembly, the output shaft of the winding assembly is fixedly connected to a pull rope, and the end of the pull rope is wrapped around the outer wall of the second rotating shaft and fixedly connected to the outer wall of the first rotating shaft.

[0016] Furthermore, both ends of the first rotating shaft are rotatably connected to the inner wall of the through groove, and the inner wall of the gear teeth matches and meshes with the inner wall of the tooth groove.

[0017] Furthermore, a pressure sensor is fixedly mounted on the inner wall of the box, and an alarm is fixedly mounted on the outer wall of the cabinet, and the pressure sensor and the alarm are electrically connected.

[0018] Furthermore, a power supply assembly is fixedly installed on the inner wall of the cabinet, and one end of the terminal away from the box is fixedly installed inside the power supply assembly. A switch assembly is fixedly installed on the inner wall of the cabinet, and the other end of the terminal away from the box is fixedly installed inside the switch assembly.

[0019] Compared with the prior art, the above solution has the following beneficial effects:

[0020] 1. When overpower occurs in the device, the two terminal protection covers quickly respond and merge to automatically protect the wiring terminals, so that the wiring terminals will not come into contact with other components, and prevent the exposed wiring terminals from accidentally contacting other conductors or metal parts to cause short circuits, reducing the risk of electric shock, thereby protecting other components in the circuit from damage. At the same time, it blocks the intrusion of dust and foreign matter to a certain extent, reduces the occurrence of short circuits or leakage caused by factors such as end corrosion and leakage, and protects the interface end of the wiring terminals through intelligent real-time triggering, which can improve the efficiency of subsequent maintenance and safety when overpower occurs.

[0021] 2. When the device is overpowered, the temperature sensing is performed through the shape memory alloy to intelligently open and close the slot. The slot can be automatically opened when the inside of the slot is overheated, and automatically closed after the heat dissipation is completed, while preventing the spread of thermal runaway. It can intelligently balance the heat dissipation and protection performance. Timely heat dissipation of the terminal block can avoid the excessive heat generated by the terminal block causing the equipment to malfunction or be damaged due to overheating, thereby improving the reliability and stability of the equipment. After the heat dissipation is completed, the slot can automatically maintain the sealing of the terminal block to prevent the terminal block from contacting pollutants, thereby reducing the failure rate of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1It is a schematic diagram of the overall structure proposed by the present invention;

[0023] Figure 2 This is a schematic diagram of the internal structure of the cabinet proposed by the present invention;

[0024] Figure 3 This is a schematic diagram of the internal structure of the box proposed by the present invention;

[0025] Figure 4 This is a schematic diagram of the structural transmission of the sliding plate and the first spring proposed in the present invention;

[0026] Figure 5 This is a schematic diagram of the internal structure of the terminal protection cover proposed by the present invention;

[0027] Figure 6 This is a schematic diagram of the structural transmission of the fixing rod and the locking ring proposed in the present invention;

[0028] Figure 7 This is a schematic diagram of the structural transmission of the sealing block and the second rotating shaft proposed in the present invention.

[0029] The symbols in the accompanying drawings are: 1. cabinet; 2. box; 3. fuse; 4. protective mechanism; 5. ventilation mechanism; 6. ventilation mechanism; 7. pressure sensor; 8. alarm; 9. power supply assembly; 10. terminal block; 11. switch assembly; 401. sliding plate; 402. tension spring; 403. first spring; 404. terminal protection cover; 405. slide; 406. fixing block; 407. slider; 408. third spring; 409. , slot; 501, fixing rod; 502, locking ring; 503, second spring; 504, through slot; 505, fixing plate; 506, extrusion rod; 507, shape memory alloy; 508, sealing block; 509, tooth groove; 510, protrusion; 511, groove; 601, first rotating shaft; 602, gear; 603, mounting ring; 604, second rotating shaft; 605, fan blade; 606, winding assembly; 607, pull rope. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] In the description of the present invention, it should be understood that the terms "upper," "lower," "top," and "bottom" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate description and simplify the present invention. They are not intended to indicate or imply that the positions or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations of the present invention. Furthermore, the terms "first" and "second" are used solely to distinguish an entity or operation from another entity or operation and do not require or imply any actual relationship, order, or relative importance between these entities or operations.

[0032] For example 1, please refer to Figure 1-Figure 5 A switching power supply overpower protection device includes a cabinet 1, the inner wall of the cabinet 1 is fixedly connected to a box 2, the inner wall of the box 2 is fixedly installed with a pressure sensor 7, and both ends of the box 2 are penetrated and fixedly installed with terminal blocks 10, the inner wall of the cabinet 1 is fixedly installed with a power supply component 9, the end of the terminal block 10 away from the box 2 is fixedly installed inside the power supply component 9, the inner wall of the cabinet 1 is fixedly installed with a switch component 11, and the other end of the terminal block 10 away from the box 2 is fixedly installed inside the switch component 11, and the inner wall of the box 2 is provided with a protective mechanism 4, the protective mechanism 4 includes a plurality of terminal protection covers 404, and the inner walls of the plurality of terminal protection covers 404 are provided with slide grooves 405.

[0033] Furthermore, the protective mechanism 4 includes two sliding plates 401, and a tension spring 402 is fixedly connected between the two sliding plates 401. Several first springs 403 are fixedly connected to the inner wall of the box body 2, and the ends of the several first springs 403 away from the box body 2 are fixedly connected to the side wall of the terminal protection cover 404. The side wall of the terminal protection cover 404 is fixedly connected to a fixed block 406, and the inner wall of the fixed block 406 is slidably connected to two sliders 407. A third spring 408 is fixedly connected between the two sliders 407. A slot 409 is provided on the side wall of the terminal protection cover 404. The outer wall of the third spring 408 corresponds to the inner wall of the slot 409. The outer wall of the sliding plate 401 is slidably connected to the inner wall of the box body 2. The outer wall of the terminal protection cover 404 is slidably connected to the inner wall of the box body 2. A fuse 3 is fixedly installed between the two sliding plates 401.

[0034] More specifically, when the device is in normal working condition, current will be output from the power supply component 9 through the terminal 10, and then the current will pass through the fuse 3 to power the switch component 11. The cooperation between the fuse 3 and the pressure sensor 7 can intelligently detect the working condition of the device. If an overpower condition occurs during the use of the device, when the current in the circuit exceeds the rated value of the fuse 3, the fuse inside the fuse 3 will automatically blow. Since the fuse 3 adopts a locally thinned design, the thermal stress generated when the internal fuse blows will cause the fuse 3 to rupture simultaneously. At this time, the terminal 10 on both sides of the box 2 can no longer transmit current through the fuse 3.

[0035] Then the two sliding plates 401 are no longer supported by the fuse 3, and the tension spring 402 drives the two sliding plates 401 to slide along the inner wall of the box body 2 through tension. After the two sliding plates 401 slide relative to each other, the interface ends of the two terminal blocks 10 are exposed inside the box body 2. During the sliding process of the sliding plates 401, their surfaces will be out of contact with the terminal protection cover 404, thereby no longer limiting the terminal protection cover 404. After that, the elastic force of the first spring 403 is released to drive the terminal protection cover 404 to slide, and then the terminal protection cover 404 will move toward the corresponding terminal block. 10 interface end is displaced, during which the terminal protection cover 404 will drive the fixed block 406 to slide into the inside of the slot 409 opened on the side wall of the other terminal protection cover 404, and at the same time the slider 407 will be squeezed by the inner wall of the slot 409, and then the two sliders 407 will completely slide into the inside of the fixed block 406, and then when the fixed block 406 has finished sliding, the elastic force of the third spring 408 will make the two sliders 407 engage with the inner wall of the corresponding slot 409, at this time, the corresponding two terminal protection covers 404 will fit together after sliding, and complete the encirclement of the interface end of the terminal block 10.

[0036] Although the circuit has been disconnected, the inside of the terminal block 10 connected to the power supply component 9 still has voltage. The two terminal protection covers 404 are combined to protect the terminal block 10, so that the terminal block 10 will not come into contact with other components, preventing the exposed terminal block 10 from accidentally contacting other conductors or metal parts to cause a short circuit, reducing the risk of electric shock, and thus protecting other components in the circuit from damage. At the same time, it blocks the intrusion of dust and foreign matter to a certain extent, reduces the occurrence of short circuits or leakage caused by factors such as end corrosion and leakage, and automatically protects the interface end of the terminal block 10, which can improve the efficiency and safety of subsequent maintenance.

[0037] For example 2, please refer to Figures 1-6On the basis of the first embodiment, in this embodiment, a ventilation mechanism 5 is provided on the inner wall of the slide groove 405 , and the ventilation mechanism 5 includes a plurality of locking rings 502 , and a through groove 504 is provided through the interior of each of the locking rings 502 .

[0038] Furthermore, the ventilation mechanism 5 includes a fixed rod 501, the interior of the locking ring 502 is slidably connected to the outer wall of the fixed rod 501, the bottom of the locking ring 502 is fixedly connected to the second spring 503, the inner wall of the through groove 504 is slidably connected to the sealing block 508, and the top of the sealing block 508 is rotatably connected to the shape memory alloy 507, the end of the shape memory alloy 507 away from the sealing block 508 is fixedly connected to the fixing plate 505, and the bottom of the fixing plate 505 is fixedly connected to the extrusion rod 506, the bottom of the sealing block 508 is provided with a tooth groove 509, and the locking ring 502 is fixedly connected to the second spring 503. A protrusion 510 is fixedly connected to one end, and a groove 511 is formed at the other end of the locking ring 502. Both ends of the fixing rod 501 are fixedly connected to the inner wall of the slide groove 405. The end of the second spring 503 away from the locking ring 502 is fixedly connected to the inner wall of the slide groove 405. The top of the fixing plate 505 is fixedly connected to the inner wall of the slide groove 405. The end of the extrusion rod 506 away from the fixing plate 505 corresponds to the side wall of the shape memory alloy 507. The outer wall of the protrusion 510 corresponds to the inner wall of the groove 511. The inner wall of the locking ring 502 corresponds to the outer wall of the terminal 10.

[0039] More specifically, in the process of the two terminal protection covers 404 sliding and fitting each other, the ventilation mechanism 5 will be driven to move synchronously through the slide groove 405, and the protrusion 510 will be clamped into the groove 511 opened at the end of the other locking ring 502, so that the two locking rings 502 form a circular ring and fit on the outer wall of the terminal 10 at the same time. After the two terminal protection covers 404 are displaced, the slide groove 405 will become a sealed space, and the end of the terminal 10 will be located inside the slide groove 405, thereby further improving the protection effect of the terminal 10. Since there is still current flowing inside the terminal 10, its end will continue to generate heat. When the temperature inside the sealed space of the through groove 504 is too high, the shape memory alloy 507 will intelligently sense the temperature change and deform, thereby stretching and straightening.

[0040] When the shape memory alloy 507 is deformed, its end will drive the locking ring 502 to slide along the outer wall of the fixing rod 501, and then the second spring 503 will be compressed, and at the same time, it will drive the sealing block 508 to slide along the inner wall of the through groove 504. After the sealing block 508 slides, the bottom of the sealing block 508 no longer blocks the through groove 504, and then the space above and below the locking ring 502 is connected through the through groove 504. At this time, the space inside the slide groove 405 will flow to the outside of the terminal protection cover 404 through the through groove 504, and the air outside the terminal protection cover 404 will The liquid flows through the through groove 504 to the inside of the slide groove 405, thereby automatically achieving the effect of ventilation and heat dissipation inside the slide groove 405. Later, when the temperature inside the shape memory alloy 507 drops, the supporting force of the shape memory alloy 507 on the locking ring 502 will be weakened. Then, the elastic force of the compressed second spring 503 will gradually become greater than the supporting force of the shape memory alloy 507, and then the locking ring 502 will be driven to slide along the outer wall of the fixed rod 501 to reset. At the same time, the shape memory alloy 507 will be squeezed by the end of the extrusion rod 506, causing it to be bent again, thereby preparing for the next heat dissipation.

[0041] Then the end of the shape memory alloy 507 will drive the sealing block 508 to slide along the inner wall of the through groove 504 to reset, thereby re-blocking the through groove 504. The shape memory alloy 507 senses the temperature and intelligently opens and closes the through groove 504. The through groove 504 can be automatically opened when the inside of the slide groove 405 is overheated, and automatically closed after the heat dissipation is completed, while preventing the spread of thermal runaway, thereby intelligently balancing the heat dissipation and protection performance. Timely heat dissipation of the terminal block 10 can avoid excessive heat generated by the terminal block 10 causing equipment failure or damage due to overheating, thereby improving the reliability and stability of the equipment. After the heat dissipation is completed, the slide groove 405 can automatically maintain the sealing performance of the protection of the terminal block 10 again, avoiding the terminal block 10 from contacting contaminants, thereby reducing the equipment failure rate.

[0042] For example three, please refer to Figure 1-Figure 7 On the basis of the second embodiment, in this embodiment, a ventilation mechanism 6 is provided on the inner wall of the through slot 504, an alarm 8 is fixedly mounted on the outer wall of the cabinet 1, and the pressure sensor 7 and the alarm 8 are electrically connected.

[0043] Furthermore, the ventilation mechanism 6 includes a first rotating shaft 601, and the outer wall of the first rotating shaft 601 is fixedly connected to a gear 602, the inner wall of the through slot 504 is fixedly connected to a mounting ring 603, and the inner wall of the mounting ring 603 is rotatably connected to the second rotating shaft 604, the outer wall of the second rotating shaft 604 is fixedly installed with a fan blade 605, the inner wall of the through slot 504 is fixedly installed with a winding assembly 606, the output shaft of the winding assembly 606 is fixedly connected to a pull rope 607, the end of the pull rope 607 is wrapped around the outer wall of the second rotating shaft 604 and fixedly connected to the outer wall of the first rotating shaft 601, both ends of the first rotating shaft 601 are rotatably connected to the inner wall of the through slot 504, and the inner wall of the gear teeth of the gear 602 matches and meshes with the inner wall of the tooth groove 509.

[0044] More specifically, when the sealing block 508 slides along the through slot 504, the gear 602 is driven to rotate synchronously through the tooth groove 509, and then the gear 602 drives the first rotating shaft 601 to rotate along the inner wall of the through slot 504. During the rotation of the first rotating shaft 601, the pull rope 607 is wound, and the winding assembly 606 pays off the rope, which causes the wound second rotating shaft 604 to rotate. Then the second rotating shaft 604 drives the fan blade 605 to rotate synchronously, so that the rotation of the fan blade 605 can drive the external air to quickly enter the interior of the chute 405. Due to the internal locking ring 502 on the other side, The fan blades 605 are arranged in the opposite direction, so the rotation of the other fan blade 605 can drive the air inside the slide 405 to be discharged quickly, thereby accelerating the efficiency of automatic exchange between the slide 405 and the external space, thereby improving the heat dissipation effect of the terminal 10. Later, when the sealing block 508 is reset and slid, the pull rope 607 released by the rotation of the first rotating shaft 601 will be reeled in by the reeling component 606, and in this process, the fan blades 605 will also be driven to rotate, thereby automatically improving the heat dissipation effect of the terminal 10 without the need for an additional driving source, further reducing the damage to the equipment caused by overheating of the terminal 10.

[0045] When the fuse 3 breaks, the two sliding plates 401 are displaced by the tension spring 402. The sliding plates 401 slide along the inner wall of the box 2 and contact the pressure sensor 7. Then the pressure sensor 7 drives the alarm 8 to sound an alarm, thereby notifying the staff in time for timely maintenance.

[0046] The working principle of the present invention is: when the device is in normal working condition, current will be output from the power supply component 9 through the terminal 10, and then the current will pass through the fuse 3 to power the switch component 11. If an overpower condition occurs during the use of the device, when the current in the circuit exceeds the rated value of the fuse 3, the fuse inside the fuse 3 will be blown. Since the fuse 3 adopts a locally thinned design, the thermal stress generated when the fuse inside it is blown will cause the fuse 3 to rupture simultaneously. At this time, the terminal 10 on both sides of the box 2 can no longer transmit current through the fuse 3.

[0047] Then, the tension spring 402 will drive the two sliding plates 401 to slide through the tension force, at which time the interface ends of the two terminal blocks 10 will be exposed inside the box 2. During the sliding process of the sliding plate 401, its surface will be out of contact with the terminal protection cover 404, thereby no longer limiting the terminal protection cover 404. Then, the elastic force of the first spring 403 is released to drive the terminal protection cover 404 to slide, and then the terminal protection cover 404 will move toward the corresponding interface end of the terminal block 10. After the sliding is completed, the corresponding two terminal protection covers 404 will fit together and complete the encirclement of the interface end of the terminal block 10. The two merged terminal protection covers 404 are used to protect the terminal block 10, so that the terminal block 10 will not come into contact with other components, preventing the exposed terminal block 10 from accidentally contacting other conductors or metal parts and causing a short circuit. While the two sliding plates 401 are moving, the sliding plate 401 will contact the pressure sensor 7 when sliding along the inner wall of the box 2. Then the pressure sensor 7 will drive the alarm 8 to sound an alarm, thereby notifying the staff in time for timely maintenance.

[0048] Since current is still flowing inside the terminal 10, its end will continue to generate heat. When the temperature inside the sealed space of the through slot 504 is too high, the shape memory alloy 507 will be affected by the temperature and deform, and then it will stretch and straighten. During the deformation of the shape memory alloy 507, its end will drive the locking ring 502 to slide along the outer wall of the fixing rod 501, and then the second spring 503 will be compressed, and at the same time, it will drive the sealing block 508 to slide along the inner wall of the through slot 504. At this time, the bottom of the sealing block 508 no longer blocks the through slot 504, and then the space above and below the locking ring 502 is connected through the through slot 504. At this time, the space inside the slide groove 405 will flow to the outside of the terminal protection cover 404 through the through slot 504, and at the same time, the air outside the terminal protection cover 404 will flow to the inside of the slide groove 405 through the through slot 504, thereby achieving the effect of ventilation and heat dissipation inside the slide groove 405.

[0049] It should be noted that the various devices in this application are common devices in the market, and can be selected according to specific needs during specific use. The circuit connection relationship of each device is a simple series and parallel connection circuit. There is no innovation in the circuit connection part. Those skilled in the art can implement it relatively easily. It belongs to the existing technology and will not be elaborated on.

[0050] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined by the claims.

Claims

1. An overpower protection device for a switching power supply, comprising a cabinet (1), characterized in that: The inner wall of the cabinet (1) is fixedly connected to a box (2), and both ends of the box (2) are penetrated by fixedly installed wiring terminals (10); The inner wall of the box (2) is provided with a protection mechanism (4) to automatically protect the end of the connection terminal (10) when overpower occurs; The protection mechanism (4) includes a plurality of terminal protection covers (404), the inner walls of the plurality of terminal protection covers (404) are each provided with a slide groove (405), and the inner wall of the slide groove (405) is provided with a ventilation mechanism (5) for automatically ventilating the interior of the terminal protection cover (404) when the interior of the terminal protection cover (404) is overheated; The protection mechanism (4) comprises a sliding plate (401), the outer wall of the sliding plate (401) is slidably connected to the inner wall of the box (2), the outer wall of the terminal protection cover (404) is slidably connected to the inner wall of the box (2), and a fuse (3) is fixedly installed between the two sliding plates (401).

2. The overpower protection device of a switching power supply according to claim 1, characterized in that: The protection mechanism (4) includes two sliding plates (401), a tension spring (402) is fixedly connected between the two sliding plates (401), a plurality of first springs (403) are fixedly connected to the inner wall of the box body (2), and the ends of the plurality of first springs (403) away from the box body (2) are fixedly connected to the side wall of the terminal protection cover (404), the side wall of the terminal protection cover (404) is fixedly connected to a fixed block (406), and the inner wall of the fixed block (406) is slidably connected to two sliders (407), a third spring (408) is fixedly connected between the two sliders (407), a slot (409) is provided on the side wall of the terminal protection cover (404), and the outer wall of the third spring (408) corresponds to the inner wall of the slot (409).

3. The overpower protection device of a switching power supply according to claim 2, characterized in that: The ventilation mechanism (5) comprises a plurality of locking rings (502), each of the locking rings (502) having a through slot (504) extending therethrough, and an air exchange mechanism (6) is provided on the inner wall of the through slot (504).

4. The overpower protection device for a switching power supply according to claim 3, characterized in that: The ventilation mechanism (5) comprises a fixed rod (501), the interior of the locking ring (502) is slidably connected to the outer wall of the fixed rod (501), the bottom of the locking ring (502) is fixedly connected to a second spring (503), the inner wall of the through groove (504) is slidably connected to a sealing block (508), and the top of the sealing block (508) is rotatably connected to a shape memory alloy (507), one end of the shape memory alloy (507) away from the sealing block (508) is fixedly connected to a fixed plate (505), and the bottom of the fixing plate (505) is fixedly connected to an extrusion rod (506), the bottom of the sealing block (508) is provided with a tooth groove (509), one end of the locking ring (502) is fixedly connected to a protrusion (510), and the other end of the locking ring (502) is provided with a groove (511).

5. The overpower protection device of a switching power supply according to claim 4, characterized in that: Both ends of the fixing rod (501) are fixedly connected to the inner wall of the slide groove (405), one end of the second spring (503) away from the locking ring (502) is fixedly connected to the inner wall of the slide groove (405), the top of the fixing plate (505) is fixedly connected to the inner wall of the slide groove (405), one end of the extrusion rod (506) away from the fixing plate (505) corresponds to the side wall of the shape memory alloy (507), the outer wall of the protrusion (510) corresponds to the inner wall of the groove (511), and the inner wall of the locking ring (502) corresponds to the outer wall of the terminal (10).

6. The overpower protection device of a switching power supply according to claim 5, characterized in that: The ventilation mechanism (6) includes a first rotating shaft (601), and the outer wall of the first rotating shaft (601) is fixedly connected to a gear (602), the inner wall of the through slot (504) is fixedly connected to a mounting ring (603), and the inner wall of the mounting ring (603) is rotatably connected to a second rotating shaft (604), the outer wall of the second rotating shaft (604) is fixedly installed with a fan blade (605), the inner wall of the through slot (504) is fixedly installed with a winding assembly (606), the output shaft of the winding assembly (606) is fixedly connected to a pull rope (607), and the end of the pull rope (607) is wound around the outer wall of the second rotating shaft (604) and fixedly connected to the outer wall of the first rotating shaft (601).

7. The overpower protection device of a switching power supply according to claim 6, characterized in that: Both ends of the first rotating shaft (601) are rotatably connected to the inner wall of the through groove (504), and the inner wall of the gear teeth of the gear (602) is matched and meshed with the inner wall of the tooth groove (509).

8. The overpower protection device of a switching power supply according to claim 7, characterized in that: A pressure sensor (7) is fixedly mounted on the inner wall of the box (2), and an alarm (8) is fixedly mounted on the outer wall of the cabinet (1); the pressure sensor (7) and the alarm (8) are electrically connected.

9. The overpower protection device of a switching power supply according to claim 8, characterized in that: A power supply assembly (9) is fixedly mounted on the inner wall of the cabinet (1), one end of the wiring terminal (10) away from the box (2) is fixedly mounted inside the power supply assembly (9), a switch assembly (11) is fixedly mounted on the inner wall of the cabinet (1), and the other end of the wiring terminal (10) away from the box (2) is fixedly mounted inside the switch assembly (11).

Images