High-efficiency small transformer for 3c charger

Abstract

This invention relates to the field of transformer technology, specifically disclosing a high-efficiency small transformer for 3C chargers, including a mounting base, a magnetic core, a main coil, and a secondary coil. A base is fixedly connected to the lower outer surface of the mounting base. Wires are electrically connected to the outer sides of both the main coil and the secondary coil. A buffer assembly is provided on the lower side of the base. The buffer assembly includes an insulating sleeve fitted over the outside of the wires. A connecting plate is fixedly connected to the outer surface of the insulating sleeve. By setting up the buffer assembly, the friction between the piston plate and the friction block can buffer and absorb the impact force on the wires. By setting up several sets of friction blocks, the impact force can be absorbed multiple times. Under the squeezing force of the piston plate, the friction blocks compress the spring, and the elastic deformation of the spring can further absorb the impact force, thereby reducing the impact of charger drops and collisions on the stability of the wire connections to a certain extent.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, and in particular to a high-efficiency small transformer for 3C chargers. Background Technology

[0002] 3C chargers are power adapters designed specifically for computers, communication equipment, and consumer electronics. The transformer in a 3C charger is the core component for achieving power conversion and isolation. Its core functions are voltage conversion, electrical isolation protection, and multi-protocol compatibility support. 3C chargers have been widely used in the field of electronic device power supply due to their safety certification, convenience, high efficiency, and wide compatibility.

[0003] For example, Chinese patent CN219105854U discloses a transformer with good insulation performance for mobile phone chargers. This device can reduce the transformer's contact with the outside world during operation, and the transformer is insulated. The heat transfer body, the first heat conduction rod and heat dissipation holes can reduce the operating temperature of the transformer, reduce the phenomenon of high voltage breakdown of ceramic shell and paraffin due to high temperature, and make the transformer work in an insulated environment. This can minimize the leakage of the charger during operation and make mobile phone charging safer. Existing charger transformers can extend the charger's lifespan to some extent by controlling the temperature during use. However, in actual use, chargers may be accidentally dropped or bumped during use and carrying. These drops and bumps can cause the internal transformer's wire connections to loosen. Since the transformer is sealed inside the charger, the loosening of the transformer wires cannot be directly observed. This can easily lead to a short circuit during subsequent charging, posing a certain safety hazard. Summary of the Invention

[0004] The purpose of this invention is to provide a high-efficiency small transformer for 3C chargers, which can buffer and absorb the impact force on the wires through the friction between the piston plate and the friction block, thereby reducing the impact of charger drops and collisions on the stability of wire connections to a certain extent, thus solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-efficiency small transformer for a 3C charger, comprising a mounting base, a magnetic core, a main coil, and a secondary coil. A base is fixedly connected to the lower outer surface of the mounting base. Wires are electrically connected to the outer sides of both the main coil and the secondary coil. A buffer assembly is provided on the lower side of the base. The buffer assembly includes an insulating sleeve fitted over the outside of the wires. A connecting plate is fixedly connected to the outer surface of the insulating sleeve. A sliding rod is fixedly connected to the outer surface of the connecting plate away from the insulating sleeve. A guide groove is embedded in the lower outer surface of the base. A buffer groove is embedded in the inner side of the guide groove. A friction block is slidably connected to the inner surface of the buffer groove.

[0006] Preferably, the upper end of the slide rod is located inside the guide groove and slides in contact with the inner wall of the guide groove. The upper end of the guide rod is embedded with a cavity. A piston plate is slidably connected to the inner surface of the cavity. The outer surface of the upper end of the piston plate slides in contact with the outer surface of the friction block. A second spring is fixedly connected to the outer surface of the upper end of the friction block. The upper end of the second spring is fixedly connected to the upper end of the inner surface of the buffer groove. The inner side of the cavity is filled with thermal expansion gas.

[0007] Preferably, the number of buffer grooves and friction blocks are several groups and arranged in a parallel array. The lower outer surface of the friction block is arc-shaped. A limiting strip is fixedly connected to the lower outer surface of the piston plate. The lower end of the limiting strip is fixedly connected to the lower side of the inner surface of the cavity. Both the piston plate and the friction block are made of wear-resistant material, and the limiting strip is made of elastic material.

[0008] Preferably, a clamping assembly is provided on the outer side of the base. The clamping assembly includes a traction groove that extends through the outer surface of the base. A pressing seat is slidably connected to the inner side of the traction groove. A limiting block is fixedly connected to the inner surface of the traction groove. The outer surface of the limiting block is arc-shaped and slides in contact with the outer surface of the pressing seat.

[0009] Preferably, an extrusion groove is embedded in the inner side of the extrusion seat, and an extrusion plate is slidably connected to the inner side of the extrusion groove. The extrusion plate has an L-shaped structure, and the front end of the extrusion plate is engaged with the outer surface of the front end of the base. There are two sets of extrusion plates, which are symmetrically distributed. A sleeve is fixedly connected to the outer surface of the extrusion plate. The sleeve is arc-shaped and made of elastic material.

[0010] Preferably, the extrusion seat has a U-shaped structure, a traction belt is fixedly connected to the inner surface of the extrusion seat, the side of the traction belt away from the extrusion seat is fixedly connected to the outer surface of the jacket, the jacket is made of insulating material, the extrusion seat and the extrusion plate are both made of elastic material, and the jacket engages with the outer side of the wire.

[0011] Preferably, a protective component is provided on the outer side of the base. The protective component includes a mounting plate that is fixedly connected to the outer surface of the base. A mounting hole is provided through the outer surface of the mounting plate, and a storage groove is embedded in the lower outer surface of the mounting plate.

[0012] Preferably, a contact plate is slidably connected to the inner side of the storage slot, a bladder is fixedly connected to the upper side of the inner surface of the storage slot, the outer surface of the lower end of the bladder is fixedly connected to the contact plate, a spring is fixedly connected to the inner surface of the bladder, and the number of mounting plates is two sets and they are symmetrically distributed.

[0013] Preferably, the outer surface of the mounting base has a through slot, and a magnetic core is fixedly connected to the inner surface of the slot. A main coil and a secondary coil are wound around the outer surface of the magnetic core. The magnetic core has a U-shaped structure. The main coil and the secondary coil are symmetrically distributed on the left and right sides of the magnetic core. Both the mounting base and the base are made of insulating material. The main coil and the secondary coil have different numbers of turns.

[0014] Preferably, a heat dissipation assembly is provided on the outer side of the mounting base. The heat dissipation assembly includes an air guide groove 1 embedded in the inner side of the mounting base. The air guide groove 1 is distributed in a U-shaped structure. An air guide groove 2 is embedded in the inner side of the mounting plate. One end of the air guide groove 2 is connected to the interior of the air guide groove 1, and the other end extends into the interior of the bladder. An air outlet groove is embedded in the inner surface of the mounting base. The air outlet groove is connected to the interior of the air guide groove 1. The number of air outlet grooves is several groups and they are distributed in a parallel array. Heat dissipation fins are fixedly connected to the outer surface of the mounting base.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This solution uses a buffer component to absorb the impact force on the wires through the friction between the piston plate and the friction block. By setting up several sets of friction blocks, the impact force can be absorbed multiple times. Under the pressure of the piston plate, the friction block will compress the spring, and the elastic deformation of the spring can further absorb the impact force, thereby reducing the impact of the charger falling and colliding on the stability of the wire connection to a certain extent. 2. This solution, by setting up a clamping assembly, clamps the wire to the outside of the wire. The clamp is brought together by the pulling of the traction belt and the extrusion plate, thereby achieving stable clamping of the wire, improving the stability of the electrical connection between the wire and the main coil and the secondary coil, and helping to reduce the risk of the wire loosening between itself and the main coil and the secondary coil due to impact. 3. This solution incorporates protective components. The elastic deformation of the bladder and spring one absorbs vibration and impact forces, effectively reducing the transmission of impact forces into the transformer. This further enhances the safety and stability of the overall transformer structure. The gas inside the bladder enters the air guide channel one through the air guide channel two. The flow of gas cools and dissipates heat from the main and secondary coils, ensuring the electromagnetic conversion efficiency of the main and secondary coils and helping to extend the transformer's service life. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 ; Figure 3 This is a top view of the overall structure of the present invention; Figure 4 For the present invention Figure 3 Sectional view along line AA; Figure 5 For the present invention Figure 3 Sectional view along the BB direction; Figure 6 This is a schematic diagram of the clamping component structure of the present invention; Figure 7 For the present invention Figure 4 Enlarged view of point C in the middle; Figure 8 For the present invention Figure 5 Enlarged view of point D; Figure 9 For the present invention Figure 8 Enlarged diagram of point E in the middle.

[0018] Explanation of reference numerals in the attached figures: 11. Mounting base; 12. Slot; 13. Main coil; 14. Base; 15. Mounting plate; 16. Mounting hole; 17. Wire; 18. Magnetic core; 19. Air guide slot one; 20. Air outlet slot; 21. Storage slot; 22. Contact plate; 23. Bag body; 24. Air guide slot two; 25. Spring one; 26. Traction slot; 27. Limiting block; 28. Extrusion slot; 29. ​​Extrusion plate; 30. Jacket; 31. Traction belt; 32. Extrusion seat; 33. Insulating sleeve; 34. Connecting plate; 35. Slide rod; 36. Guide slot; 37. Cavity; 38. Piston plate; 39. Buffer slot; 40. Spring two; 41. Friction block; 42. Heat dissipation fins; 43. Limiting strip; 44. Secondary coil. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1 to 9 The present invention provides a technical solution: A high-efficiency miniature transformer for a 3C charger includes a mounting base 11, a magnetic core 18, a main coil 13, and a secondary coil 44. A base 14 is fixedly connected to the lower outer surface of the mounting base 11. Wires 17 are electrically connected to the outer sides of both the main coil 13 and the secondary coil 44. A buffer assembly is provided on the lower side of the base 14. The buffer assembly includes an insulating sleeve 33 sleeved on the outside of the wires 17. A connecting plate 34 is fixedly connected to the outer surface of the insulating sleeve 33. A sliding rod 35 is fixedly connected to the outer surface of the connecting plate 34 away from the insulating sleeve 33. A guide groove 36 is embedded in the lower outer surface of the base 14. A buffer groove 39 is embedded in the inner side of the guide groove 36. A friction block 41 is slidably connected to the inner surface of the buffer groove 39.

[0021] The upper end of the slide rod 35 is located inside the guide groove 36 and slides in contact with the inner wall of the guide groove 36. The upper end of the guide rod is embedded with a cavity 37. A piston plate 38 is slidably connected to the inner surface of the cavity 37. The upper outer surface of the piston plate 38 slides in contact with the outer surface of the friction block 41. A second spring 40 is fixedly connected to the upper outer surface of the friction block 41. The upper end of the second spring 40 is fixedly connected to the upper end of the inner surface of the buffer groove 39. The cavity 37 is filled with thermal expansion gas.

[0022] The number of buffer grooves 39 and friction blocks 41 are several sets and arranged in a parallel array. The lower outer surface of the friction block 41 is arc-shaped. The lower outer surface of the piston plate 38 is fixedly connected to a limiting strip 43. The lower end of the limiting strip 43 is fixedly connected to the lower side of the inner surface of the cavity 37. Both the piston plate 38 and the friction block 41 are made of wear-resistant material, and the limiting strip 43 is made of elastic material.

[0023] The mounting base 11 has a through slot 12 on its outer surface. A magnetic core 18 is fixedly connected to the inner surface of the slot 12. A main coil 13 and a secondary coil 44 are wound around the outer surface of the magnetic core 18. The magnetic core 18 has a U-shaped structure. The main coil 13 and the secondary coil 44 are symmetrically distributed on the left and right sides of the magnetic core 18. Both the mounting base 11 and the base 14 are made of insulating material. The main coil 13 and the secondary coil 44 have different numbers of turns.

[0024] By adopting the above technical solution, the main coil 13, the secondary coil 44, and the magnetic core 18 are the core components of the small transformer. During the operation of the small transformer, when an alternating current is applied to the main coil 13, the alternating current generates a changing magnetic field, which is conducted to the secondary coil 44 through the magnetic core 18, causing a change in the magnetic flux in the secondary coil 44. This induces an electromotive force, which is then output as a voltage through the wire 17 electrically connected to the secondary coil 44. Furthermore, the main coil 13 and the secondary coil 44 use different numbers of turns, thus allowing the output voltage to be adjusted to meet the charging requirements. 3C chargers are widely used due to their good compatibility and safety. Used in the consumer electronics industry, the main coil 13 and the auxiliary coil 44 are electrically connected to the wire 17 to achieve voltage input and output. When the charger is accidentally dropped or collided during use, the wire 17 and the charger circuit board are easily loosened by the impact force. In order to ensure that the transformer inside the charger and the circuit board always maintain a good electrical connection, a buffer component is set up. The insulating sleeve 33 is sleeved on the outside of the wire 17 to clamp the lower side of the wire 17. When the wire 17 swings due to the impact force, the wire 17 will drive the slide rod 35 to move synchronously through the connecting plate 34. The slide rod 35 is in the guide groove. When sliding inside the guide groove 36, it will slide into contact with the inner wall of the guide groove 36. The buffer groove 39 on the inner side of the guide groove 36 is used to slide and support the friction block 41. During the movement, the slide rod 35 will drive the piston plate 38 to contact the outer surface of the friction block 41. At the same time, the buffer groove 39 elastically supports the friction block 41 through the spring 40, so that the outer surface of the friction block 41 protrudes into the guide groove 36. The friction between the piston plate 38 and the friction block 41 can buffer and absorb the impact force on the wire 17. By setting several sets of friction blocks 41, the impact force can be absorbed multiple times. Under the action of the piston plate 38, the friction block 41 will... The second spring 40 is compressed, and the elastic deformation of the second spring 40 can further absorb the impact force, thereby reducing the impact of the charger falling and colliding on the connection stability of the wire 17 to a certain extent. During the long-term operation of the charger, a certain amount of heat will be generated. At this time, the volume of the thermal expansion gas inside the cavity 37 will gradually expand due to the heat. Under the action of gas pressure, the piston plate 38 will move upward, thereby further increasing the friction between the piston plate 38 and the friction block 41. This not only further improves the buffering and shock absorption effect on the wire 17, but also improves the stability and safety of the charger during operation.

[0025] Specifically, such as Figure 6As shown in Figure 8, a clamping assembly is provided on the outer side of the base 14. The clamping assembly includes a traction groove 26 that extends through the outer surface of the base 14. A pressing seat 32 is slidably connected to the inner side of the traction groove 26. A limiting block 27 is fixedly connected to the inner surface of the traction groove 26. The outer surface of the limiting block 27 is arc-shaped and slides in contact with the outer surface of the pressing seat 32.

[0026] The extrusion seat 32 has an embedded extrusion groove 28, and an extrusion plate 29 is slidably connected to the inner side of the extrusion groove 28. The extrusion plate 29 has an L-shaped structure, and the front end of the extrusion plate 29 is engaged with the outer surface of the front end of the base 14. There are two sets of extrusion plates 29, which are symmetrically distributed. A sleeve 30 is fixedly connected to the outer surface of the extrusion plate 29. The sleeve 30 is arc-shaped and made of elastic material.

[0027] The extrusion seat 32 has a U-shaped structure. A traction belt 31 is fixedly connected to the inner surface of the extrusion seat 32. The side of the traction belt 31 away from the extrusion seat 32 is fixedly connected to the outer surface of the jacket 30. The jacket 30 is made of insulating material. Both the extrusion seat 32 and the extrusion plate 29 are made of elastic material. The jacket 30 is engaged and in contact with the outer side of the wire 17.

[0028] By adopting the above technical solution, in order to further improve the installation stability between the conductor 17 and the main coil 13 and the auxiliary coil 44, a clamping assembly is set up. During operation, the conductor 17 is first placed inside the traction groove 26 of the base 14, and the pressing seat 32 and pressing plate 29 are simultaneously sleeved on the outside of the conductor 17, and the clamping sleeve 30 is clamped on the outside of the conductor 17. Then, the pressing seat 32 is pushed into the traction groove 26. The outer surface of the limiting block 27 is arc-shaped and will slide in contact with the outer surface of the pressing seat 32. During the movement of the pressing seat 32, it will drive the pressing plate 29 to move synchronously through the pressing groove 28. During the movement of the pressing plate 29, it will drive the conductor 17 to move a certain distance through the clamping sleeve 30. As the pressing seat 32 gradually moves towards the traction groove 26, the conductor 17 moves further. As the guide groove 26 moves inside, the two ends of the extrusion seat 32 gradually come together. At this time, the two sets of extrusion plates 29 are pushed by the extrusion seat 32 to pull the clamp 30, thereby making the clamp 30 clamp the wire 17 more firmly. As the extrusion seat 32 and the extrusion plate 29 continue to move, when the outer surface of the extrusion plate 29 contacts the front end of the base 14, the base 14 will prevent the extrusion plate 29 from continuing to move. At this time, the clamp 30 is pulled together by the traction belt 31 and the extrusion plate 29, thereby achieving stable clamping of the wire 17, improving the stability of the electrical connection between the wire 17 and the main coil 13 and the secondary coil 44, and helping to reduce the risk of the wire 17 becoming loose due to impact between it and the main coil 13 and the secondary coil 44.

[0029] Specifically, such as Figure 4 and Figure 7As shown, a protective component is provided on the outer side of the base 14. The protective component includes a mounting plate 15 that is fixedly connected to the outer surface of the base 14. A mounting hole 16 is provided through the outer surface of the mounting plate 15, and a storage groove 21 is embedded in the lower outer surface of the mounting plate 15.

[0030] The inner side of the storage slot 21 is slidably connected to a contact plate 22. The upper side of the inner surface of the storage slot 21 is fixedly connected to a bladder 23. The lower outer surface of the bladder 23 is fixedly connected to the contact plate 22. The inner surface of the bladder 23 is fixedly connected to a spring 25. The number of mounting plates 15 is two sets and they are symmetrically distributed.

[0031] By adopting the above technical solution, in order to further improve the installation stability and protection effect of the transformer, a protective component is set up. During the installation of the transformer, the mounting plate 15 and the mounting base 11 are fixedly installed through the mounting holes 16 on the surface of the mounting plate 15. The mounting plate 15 is used to slide and support the contact plate 22 through the storage groove 21. The lower surface of the contact plate 22 will contact the circuit board inside the charger. The mounting plate 15 can elastically support the contact plate 22 through the bladder 23 and the spring 25. When the charger is hit by collision and impact, the elastic deformation of the bladder 23 and the spring 25 can absorb the vibration and impact force, thereby effectively reducing the impact force transmitted to the inside of the transformer, thereby further improving the safety and stability of the overall structure of the transformer.

[0032] Specifically, such as Figure 4 and Figure 7 As shown, a heat dissipation assembly is provided on the outer side of the mounting base 11. The heat dissipation assembly includes an air guide groove 19 embedded in the inner side of the mounting base 11. The air guide groove 19 is distributed in a U-shape. An air guide groove 24 is embedded in the inner side of the mounting plate 15. One end of the air guide groove 24 is connected to the interior of the air guide groove 19, and the other end extends into the interior of the bladder 23. An air outlet groove 20 is embedded in the inner surface of the mounting base 11. The air outlet groove 20 is connected to the interior of the air guide groove 19. The number of air outlet grooves 20 is several groups and they are distributed in a parallel array. Heat dissipation fins 42 are fixedly connected to the outer surface of the mounting base 11.

[0033] By adopting the above technical solution, the main coil 13 and the auxiliary coil 44 will continuously generate heat when conducting electricity. In order to improve the heat dissipation effect of the transformer, a heat dissipation component is set. The heat dissipation fins 42 on the surface of the mounting base 11 will effectively increase the contact area with the air, thereby improving the heat dissipation efficiency to a certain extent. When the contact plate 22 and the mounting plate 15 squeeze the bladder 23, the gas inside the bladder 23 will enter the air guide groove 19 through the second air guide groove 24, and then the gas will be ejected to the outside of the main coil 13 and the auxiliary coil 44 through the air outlet groove 20. By setting several sets of parallel distribution The air outlet 20 of the cloth can evenly blow gas to the outside of the main coil 13 and the auxiliary coil 44. The flow of gas can cool down the main coil 13 and the auxiliary coil 44, thereby ensuring the electromagnetic conversion efficiency of the main coil 13 and the auxiliary coil 44 and helping to extend the service life of the transformer. When the bag 23 is stretched, the gas outside the main coil 13 and the auxiliary coil 44 will be drawn into the air guide slot 19 and the air guide slot 24 in the opposite direction, which can accelerate the flow of gas around the main coil 13 and the auxiliary coil 44 to a certain extent, and help to further improve the heat dissipation efficiency of the transformer.

[0034] Working principle: When the micro transformer is working, when the main coil 13 is connected to an alternating current, the alternating current generates a changing magnetic field, which is conducted to the secondary coil 44 through the magnetic core 18, causing a change in the magnetic flux in the secondary coil 44. This induces an electromotive force, which is output through the wire 17 electrically connected to the secondary coil 44. When the wire 17 swings due to an impact, the friction between the piston plate 38 and the friction block 41 can buffer and absorb the impact force on the wire 17. Under the squeezing force of the piston plate 38, the friction block 41 compresses the spring, and the elastic deformation of the spring can further absorb the impact force, thereby reducing the impact of the charger falling and colliding on the connection stability of the wire 17 to a certain extent. During the movement, the squeezing seat 32 drives the squeezing plate 29 to move synchronously through the squeezing groove 28. As the squeezing seat 32 gradually moves towards the traction groove 26... The internal movement of the two sets of extrusion plates 29, pushed by the extrusion seat 32, pulls the jacket 30, thereby making the jacket 30 clamp the wire 17 more firmly. The mounting plate 15 can elastically support the contact plate 22 through the bladder 23 and the spring 25. When the charger is hit by collisions and impacts, the elastic deformation of the bladder 23 and the spring 25 can absorb the vibration and impact force, thereby effectively reducing the impact force transmitted to the inside of the transformer. When the contact plate 22 and the mounting plate 15 extrude the bladder 23, the gas inside the bladder 23 will enter the air guide groove 19 through the air guide groove 24, and then the gas will be ejected to the outside of the main coil 13 and the auxiliary coil 44 through the air outlet groove 20. The flow of gas can cool down the main coil 13 and the auxiliary coil 44, thereby ensuring the electromagnetic conversion efficiency of the main coil 13 and the auxiliary coil 44 and helping to extend the service life of the transformer.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-efficiency miniature transformer for a 3C charger, comprising a mounting base (11), a magnetic core (18), a main coil (13), and a secondary coil (44), characterized in that: A base (14) is fixedly connected to the lower outer surface of the mounting base (11). The main coil (13) and the auxiliary coil (44) are electrically connected to wires (17) on their outer sides. A buffer assembly is provided on the lower side of the base (14). The buffer assembly includes an insulating sleeve (33) sleeved on the outside of the wires (17). A connecting plate (34) is fixedly connected to the outer surface of the insulating sleeve (33). A sliding rod (35) is fixedly connected to the outer surface of the connecting plate (34) on the side away from the insulating sleeve (33). A guide groove (36) is embedded in the lower outer surface of the base (14). A buffer groove (39) is embedded in the inner side of the guide groove (36). A friction block (41) is slidably connected to the inner surface of the buffer groove (39). The upper end of the slide rod (35) is located inside the guide groove (36) and slides in contact with the inner wall of the guide groove (36). The upper end of the slide rod (35) is embedded with a cavity (37). A piston plate (38) is slidably connected to the inner surface of the cavity (37). The outer surface of the upper end of the piston plate (38) slides in contact with the outer surface of the friction block (41). A second spring (40) is fixedly connected to the outer surface of the upper end of the friction block (41). The upper end of the second spring (40) is fixedly connected to the upper end of the inner surface of the buffer groove (39). The cavity (37) is filled with thermal expansion gas. The number of buffer grooves (39) and friction blocks (41) are several groups and are distributed in a parallel array. The lower outer surface of the friction block (41) is arc-shaped. The lower outer surface of the piston plate (38) is fixedly connected to a limiting strip (43). The lower end of the limiting strip (43) is fixedly connected to the lower side of the inner surface of the cavity (37). The piston plate (38) and the friction block (41) are both made of wear-resistant material. The limiting strip (43) is made of elastic material.

2. The high-efficiency miniature transformer for a 3C charger according to claim 1, characterized in that: A clamping assembly is provided on the outer side of the base (14). The clamping assembly includes a traction groove (26) that extends through the outer surface of the base (14). A pressing seat (32) is slidably connected to the inner side of the traction groove (26). A limiting block (27) is fixedly connected to the inner surface of the traction groove (26). The outer surface of the limiting block (27) is arc-shaped, and the outer surface of the limiting block (27) slides in contact with the outer surface of the pressing seat (32).

3. The high-efficiency miniature transformer for a 3C charger according to claim 2, characterized in that: The extrusion seat (32) has an extrusion groove (28) embedded in its inner side. An extrusion plate (29) is slidably connected to the inner side of the extrusion groove (28). The extrusion plate (29) has an L-shaped structure. The front end of the extrusion plate (29) is engaged with the outer surface of the front end of the base (14). There are two sets of extrusion plates (29) that are symmetrically distributed. A sleeve (30) is fixedly connected to the outer surface of the extrusion plate (29). The sleeve (30) is arc-shaped and made of elastic material.

4. The high-efficiency miniature transformer for a 3C charger according to claim 3, characterized in that: The extrusion seat (32) has a U-shaped structure. A traction belt (31) is fixedly connected to the inner surface of the extrusion seat (32). The traction belt (31) is fixedly connected to the outer surface of the jacket (30) on the side away from the extrusion seat (32). The jacket (30) is made of insulating material. Both the extrusion seat (32) and the extrusion plate (29) are made of elastic material. The jacket (30) is engaged with the outer side of the wire (17).

5. A high-efficiency miniature transformer for a 3C charger according to claim 4, characterized in that: The base (14) is provided with a protective component on its outer side. The protective component includes a mounting plate (15) fixedly connected to the outer surface of the base (14). The outer surface of the mounting plate (15) is provided with a mounting hole (16) through it. The lower outer surface of the mounting plate (15) is provided with a storage groove (21).

6. A high-efficiency miniature transformer for a 3C charger according to claim 5, characterized in that: The inner side of the storage slot (21) is slidably connected to a contact plate (22), and the upper side of the inner surface of the storage slot (21) is fixedly connected to a bladder (23). The lower outer surface of the bladder (23) is fixedly connected to the contact plate (22), and the inner surface of the bladder (23) is fixedly connected to a spring (25). The number of mounting plates (15) is two sets and they are symmetrically distributed.

7. A high-efficiency miniature transformer for a 3C charger according to claim 6, characterized in that: The mounting base (11) has a slot (12) through its outer surface. A magnetic core (18) is fixedly connected to the inner surface of the slot (12). A main coil (13) and a secondary coil (44) are wound around the outer surface of the magnetic core (18). The magnetic core (18) has a spiral structure. The main coil (13) and the secondary coil (44) are symmetrically distributed on the left and right sides of the magnetic core (18). The mounting base (11) and the base (14) are both made of insulating material. The main coil (13) and the secondary coil (44) have different numbers of turns.

8. A high-efficiency miniature transformer for a 3C charger according to claim 7, characterized in that: A heat dissipation assembly is provided on the outside of the mounting base (11). The heat dissipation assembly includes an air guide groove (19) embedded in the inside of the mounting base (11). The air guide groove (19) is distributed in a U-shape. An air guide groove (24) is embedded in the inside of the mounting plate (15). One end of the air guide groove (24) is connected to the inside of the air guide groove (19), and the other end extends into the inside of the bladder (23). An air outlet groove (20) is embedded in the inner surface of the mounting base (11). The air outlet groove (20) is connected to the inside of the air guide groove (19). The number of air outlet grooves (20) is several groups and they are distributed in a parallel array. Heat dissipation fins (42) are fixedly connected to the outer surface of the mounting base (11).

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