Safety mobile power supply for alternating current conversion

Abstract

The application discloses a safe mobile power supply for alternating current conversion and belongs to the technical field of power supply devices, which comprises an alternating current conversion circuit, wherein the alternating current conversion circuit comprises a rectifier bridge connected with a commercial power grid, a fuse is connected in series between the rectifier bridge and the commercial power grid, a controller is connected to an input end of the rectifier bridge through a first capacitor C1 with ground protection, and an output end of the controller is connected with a first resistor R1 with ground protection; a second capacitor C2 and a common mode inductor L are connected in parallel to an output end of the rectifier bridge, a third capacitor C3 and a fourth capacitor C4 and a fifth capacitor C5 connected in series are connected in parallel to an output end of the common mode inductor L, and the output ends of the fourth capacitor C4 and the fifth capacitor C5 are connected to the controller with ground protection. The application can solve the technical problem that if the mobile power supply is in an electromagnetic environment, it is easy to encounter unexpected interference of external electromagnetic signals, which can cause the performance of the power module to decrease in the complex electromagnetic environment, and further affect the practicability of the power supply.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power supply devices, and particularly relates to a safe mobile power supply for alternating current conversion. BACKGROUND

[0002] The safe mobile power supply is also called a mobile power supply, is an extended definition of the performance and quality of an ordinary mobile power supply, and is a safe mobile power supply developed for the quality problems that increasingly perplex consumers in the mobile power supply market. The safe mobile power supply is characterized by safety and reliability and will not cause accidents such as explosion and combustion. The safe mobile power supply is mainly used for digital products such as mobile phones, computers, mp3, mp4, game consoles and tablet computers. The principle of the mobile power supply is simple. In a place where an external power supply can be found, the built-in battery is precharged, that is, input power is stored in the form of chemical energy in advance. When needed, the battery provides power and generates power to achieve the required voltage by using a voltage converter, and the output terminal outputs power to supply the required equipment for charging or other purposes.

[0003] The mobile power supply is also called a "power bank", an "external battery", an "external battery", a "backup battery" and the like. The concept of the mobile power supply has developed with the popularity and rapid growth of digital products. The definition of the mobile power supply is a large-capacity portable power supply that is convenient and easy to carry. The mobile power supply is essentially a power supply that can store electrical energy in advance and then release it to charge appropriate digital electronic products when needed. The commonly used mobile power supply generally refers to a mobile power supply that uses a lithium battery as a storage energy medium to output voltage to charge a mobile phone.

[0004] The mobile power supply usually encounters the following problems in use: 1. If the mobile power supply is in an electromagnetic environment, it is easy to encounter unexpected interference of external electromagnetic signals, which can cause the performance of the power module to decrease in a complex electromagnetic environment, and can even cause a fault, thereby affecting the practicability of the power supply; 2. The mobile power supply is usually of a sealed structure. In the process of heat dissipation, the heat in the power supply is quickly conducted to the outside through the good heat conduction performance of the heat dissipation fins and the heat conduction copper plate, and the heat is dissipated through air convection. If this heat dissipation method is used in an outdoor high-temperature environment, the heat dissipation performance is poor, and the heat cannot be effectively dissipated, thereby reducing the safety and reliability of product use. SUMMARY

[0005] The purpose of the present application is to provide a safe mobile power supply for alternating current conversion to solve the technical problem that if the mobile power supply is in an electromagnetic environment, it is easy to encounter unexpected interference of external electromagnetic signals, which can cause the performance of the power module to decrease in a complex electromagnetic environment, and can even cause a fault, thereby affecting the practicability of the power supply.

[0006] In order to achieve the above-mentioned purpose, the application adopts the following technical scheme:

[0007] A safe mobile power supply for alternating current conversion, comprising:

[0008] An alternating current conversion circuit, the alternating current conversion circuit comprising a rectifier bridge connected with a power grid, a fuse being connected in series between the rectifier bridge and the power grid, a controller being connected with a first capacitor C1 connected with the rectifier bridge through ground protection, and a first resistor R1 being connected with the output end of the controller through ground protection;

[0009] The output end of the rectifier bridge is connected in parallel with a second capacitor C2 and a common mode inductor L, the output end of the common mode inductor L is connected in parallel with a third capacitor C3 and a fourth capacitor C4 and a fifth capacitor C5 connected in series, the output end of the fourth capacitor C4 and the fifth capacitor C5 is connected to the controller through ground protection, and a transformer T is connected in electrical connection with the output end of the fourth capacitor C4 and the fifth capacitor C5, the output end of the transformer T is connected in parallel with a sixth capacitor C6 and a second resistor R2 through a diode D, and the output end of the transformer is connected to a voltage output end.

[0010] Further, the model of the controller is CR52177.

[0011] Further, it further comprises an assembling mechanism, the assembling mechanism comprising an upper shell and a lower shell, the upper shell being installed on the lower shell through clamping limiting, and a containing cavity for placing electronic components being formed between the upper shell and the lower shell.

[0012] Further, the upper shell is integrally connected with a limiting portion on both sides of the bottom end, one side of the outer wall of the limiting portion is arranged in a trapezoidal shape, the limiting portion is connected in the limiting groove on the side wall of the lower shell through clamping installation, a stepped port corresponding to the limiting portion is formed on the limiting groove, a protruding portion extending downward is arranged at the edge of the bottom end of the upper shell, a socket is formed between adjacent protruding portions, and the socket is limited and fixed with the plug block on the inner wall of the lower shell through plug-in installation.

[0013] Further, the inner wall of the lower shell is provided with a resisting port connected with a battery at the bottom length direction, and a heat dissipation assembly is arranged in the containing cavity on both sides of the resisting port.

[0014] Further, the heat dissipation assembly comprises a bimetallic strip arranged on the inner wall of the cover body, the bimetallic strip comprises a driving layer movably connected to the inner wall of the cover body, a driven layer is arranged at one end of the driving layer, a baffle is arranged on the movable shaft outside the driven layer, the outer wall of the movable shaft is rotatably connected to the positioning ring, the baffle is arranged in an L shape, a heat dissipation hole is arranged at the downward extension of the baffle and located at the bottom of the cover body, and the connecting portion between the movable shaft and the positioning ring is connected through a return spring.

[0015] Further, the top end of the positioning ring is provided with an annular groove, a guide rod movably connected to the two ends of the movable shaft is arranged on the annular groove, and a spring accumulator is arranged on the positioning ring and connected to one end of the guide rod.

[0016] Further, the spring accumulator comprises a push rod movably connected to the box body, one end of the push rod is movably attached to the guide rod, the other end of the push rod penetrates through the box body and is connected to the lifting block through a swing rod, the lifting block is connected to the counterweight through hydraulic oil at the top, the counterweight is connected to the inner wall of the box body through an elastic air bag at the top, and the elastic air bag is filled with oil and compressed gas.

[0017] Further, the swing rod is rotatably connected to the lifting block and the push rod at both ends, the push rod is provided with a fixed plate abutting against the inner wall of the box body at one end, and the counterweight and the top of the inner wall of the box body are connected through a telescopic rod.

[0018] As described above, due to the adoption of the above technical scheme, the present application has the following advantages:

[0019] The AC conversion circuit is arranged, the rectifier bridge can convert the AC power of the power grid into DC power and store it through the battery, and the fuse on the rectifier bridge can provide overload protection

[0020] Effect

[0021] When the current abnormally rises to a certain height and heat, the fuse will be fused to cut off the current, protecting the safe operation of the circuit, the filter arranged in the circuit can effectively prevent electromagnetic interference and effectively ensure the stable operation of the charging operation, the controller adjusts the transformer to output stable voltage, the common mode inductance L will sharply rise after coupling due to the consistent magnetic flux direction of the two coils when encountering common mode interference, thereby generating significant inductive reactance to the common mode signal and hindering its passage, the second capacitor C2 and the third capacitor C3 are usually thin film capacitors, and the main function is to filter common mode interference, and the filter circuit composed of the diode D and the sixth capacitor C6 can have a secondary filtering effect, the capacitor is used for filtering high-frequency noise, and the diode is used for rectification.

[0022] The assembling mechanism is arranged, when the upper shell and the lower shell of the mobile power supply are connected, the structure is installed and fixed in a manner of clamping and limiting through the limiting portion and inserting and mounting through the protruding portion, the mutual cooperation of the two can quickly realize the fixed installation work of the structural member, in addition, the limiting portion in the trapezoidal shape can effectively expand the abutting area and increase the clamping position points, thereby improving the stability and reliability of the connection of the structural member.

[0023] The heat dissipation assembly is arranged, the heat dissipation hole in the power supply is usually closed, the temperature change characteristic of the bimetallic strip is utilized, the deformation of the active layer is greater than that of the passive layer when the temperature changes, and thus the whole bimetallic strip is bent to the passive layer side.

[0024] Coefficient of thermal expansion

[0025] When the temperature changes, the deformation of the active layer is greater than that of the passive layer, so that the whole bimetallic strip is bent to the passive layer side. When the bimetallic strip is bent, the rotation of the baffle is pushed, and the heat dissipation hole is opened for ventilation and heat dissipation. At the same time, the baffle can drive the rotation of the movable shaft in the positioning ring. When the temperature decreases, the bimetallic strip returns to the original position, and the baffle returns to the original position under the elastic recovery of the return spring, so as to play a corresponding protection and shielding effect.

[0026] The accumulator is arranged, and the accumulator can be used as a safety backup for the rotating movable shaft. When the return spring is damaged, the baffle connected to the movable shaft cannot return to the original position, and the heat dissipation hole cannot be blocked. When the guide rod on the movable shaft rotates, it will be in contact with the push rod and drive the movement of the push rod. Under the rotating connection of the swing rod, the lifting block drives the movement assembly to move upwards, so as to convert the pressure energy of the compressed gas in the elastic air bag and the gravitational potential energy of the counterweight. The push rod can help the baffle on the movable shaft to rotate and return to the original position by combining the pressure energy of the compressed gas and the gravitational potential energy of the counterweight, so as to provide secondary protection for the damaged return spring, improve the product quality, and effectively prolong the service life of the device. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0028] Figure 1 is a circuit schematic diagram of a safety type mobile power supply for converting alternating current;

[0029] Figure 2 is a structural schematic diagram of a safety type mobile power supply for converting alternating current;

[0030] Figure 3 is an explosion diagram of a safety type mobile power supply for converting alternating current;

[0031] Figure 4 is a structural schematic diagram of the upper shell;

[0032] Figure 5 is aFigure 4 Enlarged view of point A;

[0033] Figure 6 This is a schematic diagram of the heat dissipation component of the present invention;

[0034] Figure 7 This is a schematic diagram of the connection between the movable shaft and the positioning ring of the present invention. Figure 1 ;

[0035] Figure 8 This is a schematic diagram of the connection between the movable shaft and the positioning ring of the present invention. Figure 2 ;

[0036] Figure 9 This is a schematic diagram of the energy storage device of the present invention.

[0037] Reference numerals: 1. Assembly mechanism; 2. Upper shell; 3. Lower shell; 4. Limiting part; 5. Protrusion; 6. Heat dissipation component; 7. Cover; 8. Bimetallic strip; 9. Active layer; 10. Passive layer; 11. Movable shaft; 12. Baffle; 13. Positioning ring; 14. Heat dissipation hole; 15. Return spring; 16. Annular groove; 17. Guide rod; 18. Accumulator; 19. Box body; 20. Push rod; 21. Swing rod; 22. Lifting block; 23. Hydraulic oil; 24. Counterweight; 25. Elastic airbag; 26. Compressed gas; 27. Fixing plate; 28. Telescopic rod. Detailed Implementation

[0038] 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.

[0039] Reference manual attached Figure 1 As shown, a safe portable power supply for AC conversion includes:

[0040] An AC conversion circuit includes a rectifier bridge connected to the mains power grid, a fuse connected in series between the rectifier bridge and the mains power, a controller connected to the input terminal of the rectifier bridge through a first capacitor C1 for grounding protection, and a first resistor R1 for grounding protection connected to the output terminal of the controller.

[0041] The rectifier bridge output end is connected in parallel with a second capacitor C2 and a common mode inductor L, the common mode inductor L output end is connected in parallel with a third capacitor C3 and a fourth capacitor C4 and a fifth capacitor C5 connected in series, the fourth capacitor C4 and the fifth capacitor C5 output end are connected to ground protection and access to the controller, and the fourth capacitor C4 and the fifth capacitor C5 output end are electrically connected with a transformer T, the transformer T output end is connected in parallel with a sixth capacitor C6 and a second resistor R2 through a diode D, and the transformer output end is connected to the voltage output end.

[0042] The AC conversion circuit is arranged, the rectifier bridge can convert the AC power of the power grid into DC power and store it through the battery, and the fuse on the rectifier bridge can play an overload protection role. When the current abnormally rises to a certain height and heat, the fuse will be fused to cut off the current, protecting the safe operation of the circuit. The filter arranged in the circuit can effectively prevent electromagnetic interference and effectively ensure the stable operation of the charging operation. The controller adjusts the transformer to output stable voltage. When the common mode inductor L encounters common mode interference, because the magnetic flux directions of the two coils are consistent, the total inductance will rise sharply after coupling, thereby generating significant inductive reactance to the common mode signal and hindering its passage. The second capacitor C2 and the third capacitor C3 are usually thin film capacitors, and the main function is to filter out common mode interference. At the same time, the filter circuit composed of the diode D and the sixth capacitor C6 can play a secondary filtering role. The capacitor is used to filter out high-frequency noise, and the diode is used for rectification. When the signal passes through the diode, the diode converts the AC signal into a pulse signal, and then the capacitor smooths the pulse signal, thereby realizing the filtering effect.

[0043] The model of the controller is CR52177, which is a highly simplified peripheral application circuit high-performance primary-side detection controller with fast start function and shorter start time. CR52177 internally adopts multi-mode control efficiency balancing technology to reduce chip system standby power consumption and improve efficiency, and simultaneously adopts primary inductance compensation technology and internally integrated output line voltage compensation technology to ensure the output accuracy of the chip during batch production. The built-in full-voltage power adaptive compensation technology ensures that the system outputs constant power within the full-voltage range. It can work in dual-winding and triple-winding application systems, and the self-power supply function ensures that the chip can work normally under any conditions. The extremely simple peripheral application can still ensure the stable and reliable operation of the power supply system.

[0044] Specifically, as the rated current increases, the wire diameter of the common-mode inductance L also needs to be thickened accordingly to ensure that it can withstand the impact of large current. At the same time, appropriately increasing the inductance helps to improve the low-frequency attenuation characteristic, thereby improving the filtering effect. In terms of capacitance, the second capacitor C2 and the third capacitor C3 are usually thin film capacitors, and the main function is to filter out the string mode interference. The fourth capacitor C4 and the fifth capacitor C5 are connected across the output end and effectively suppress common-mode interference by connecting the midpoint to ground. It should be noted that in order to reduce the impact of leakage current, the capacitance should not be too large, and at the same time ensure that the capacitor midpoint is connected to ground. The withstand voltage of all capacitors is 630VDC or 250VAC to ensure that they can work stably in a high-voltage environment.

[0045] Reference Figure 2 , Figure 3 , Figure 4 and Figure 5 , a safety type mobile power supply for alternating current conversion further comprises an assembling mechanism 1, the assembling mechanism 1 comprises an upper shell 2 and a lower shell 3, the upper shell 2 is installed on the lower shell 3 in a clamping limiting manner, and a containing cavity for placing electronic elements is formed between the upper shell 2 and the lower shell 3.

[0046] The upper shell 2 is integrally connected with a limiting portion 4 at both sides of the bottom end, one side of the outer wall of the limiting portion 4 is arranged in a trapezoidal shape, the limiting portion 4 is connected in a clamping manner in a limiting groove on the side wall of the lower shell 3, a stepped opening corresponding to the limiting portion 4 is formed in the limiting groove, a protruding portion 5 extending downward is arranged at the edge of the bottom end of the upper shell 2, a socket is arranged between adjacent protruding portions 5, and the socket is limited and fixed with an insertion block on the inner wall of the lower shell 3 in a plug-in manner.

[0047] Specifically, the inner wall of the lower shell 3 is provided with a contact opening connected with the battery at the bottom in the length direction, and the contact opening is provided with a heat dissipation assembly 6 placed in the containing cavity at both sides, and the heat dissipation assembly 6 is placed at both sides of the battery and in a cover body 7, so that the space resources are not occupied too much, the heat dissipation assembly 6 is reasonably distributed in the containing cavity, and the heat dissipation assembly 6 can also play a good protection role on the heat dissipation assembly 6. In addition, the heat dissipation assembly 6 has simple structure and is not easy to be damaged, which effectively ensures the service life of the device.

[0048] Reference Figure 2 , Figure 6 , Figure 7 , Figure 8 and Figure 9The heat dissipation assembly 6 comprises a bimetallic strip 8 arranged on the inner wall of the cover 7, the bimetallic strip 8 comprises a driving layer 9 movably connected to the inner wall of the cover 7, one end of the driving layer 9 is provided with a passive layer 10, the passive layer 10 is externally provided with a baffle 12 arranged on a movable shaft 11, the outer wall of the movable shaft 11 is rotatably connected to a positioning ring 13, the baffle 12 is arranged in an L shape, and the downward extension of the baffle 12 is provided with a heat dissipation hole 14 arranged at the bottom of the cover 7, and the connection between the movable shaft 11 and the positioning ring 13 is connected by a return spring 15.

[0049] The assembling mechanism 1 is arranged, and when the upper shell 2 and the lower shell 3 of the mobile power supply are connected, the structure is fixed and installed in a manner of limiting part 4 clamping limiting and convex part 5 plug-in mounting. The mutual cooperation of the two can quickly realize the fixed installation work of the structure. In addition, the limiting part 4 in the trapezoidal shape can effectively expand the contact area and increase the clamping position point, thereby improving the stability and reliability of the structure connection.

[0050] Specifically, when the push plate 20 is in the initial position, the fixed plate 27 is in contact with the inner wall of the box body 19, thereby supporting the lifting block 22 connected to the swing rod 21. Since the hydraulic oil 23 is an incompressible liquid, the hydraulic oil 23 cannot accumulate pressure energy, so it can drive the synchronous lifting work of the counterweight block 24. In addition, the setting of the hydraulic oil 23 can lubricate the sliding lifting block 22 and the counterweight block 24, reducing the friction damage between the structure.

[0051] In addition, the compressed gas 26 can be compressed nitrogen or other gas, which is a conventional technical means obvious to those skilled in the art, and will not be described in detail here. During the upward pushing of the counterweight block 24, the compressed gas 26 can be compressed. During the compression process, the elastic air bag 25 is compressed and expanded, which can form the pressure energy of the compressed gas 26 itself. At the same time, during the movement of the counterweight block 24, the telescopic rod 28 can effectively prevent the position deviation of the transmission part, effectively ensuring the accuracy of the movement of the transmission part. When the mechanical energy of the lifting block 22 is converted into the pressure energy of the gas and the gravitational potential energy of the counterweight block 24, the pressure energy and the gravitational potential energy can drive the movement of the push rod 20, thereby helping the baffle 12 to reset. Even if the elastic air bag 25 is damaged or leaks, it means that the compressed gas 26 becomes meaningless, and the space cannot be compressed under the open state. Therefore, the gravitational potential energy of the counterweight block 24 can also help the push rod to reset, further improving the use effect of the device.

[0052] In extension, the lifting block 22 can also be directly connected with the elastic air bag 25 in the compressed gas 26, so that the counterweight 24 can be bypassed in the case of damage or stuck column, and the gas compression can be directly carried out, in order to ensure the normal up and down movement of the lifting block 22, the telescopic rod 28 can be arranged between the counterweight 24 and the lifting block 22, so that the interference phenomenon of the structural member can be avoided, and the independent conversion of the gas pressure and the gravity potential energy of the counterweight 24 can be ensured.

[0053] Specifically, the top end of the positioning ring 13 is provided with an annular groove 16, and a guide rod 17 is movably connected to the two ends of the movable shaft 11 and fixed on the positioning ring 13. One end of the guide rod 17 is correspondingly connected to an energy accumulator 18 mounted on the positioning ring 13. The energy accumulator 18 comprises a push rod 20 movably connected to a box body 19. One end of the push rod 20 is movably attached to the guide rod 17, and the opposite end penetrates through the box body 19 and is connected to a lifting block 22 through a swing rod 21. The lifting block 22 is connected to a counterweight 24 through hydraulic oil 23 at the top. The counterweight 24 is connected to the inner wall of the box body 19 through an elastic air bag 25 at the top. The elastic air bag 25 is filled with oil and compressed gas 26.

[0054] The heat dissipation assembly 6 is arranged, the heat dissipation hole 14 in the power supply is usually closed, the temperature change characteristics of the bimetallic strip 8 are utilized, due to the different thermal expansion coefficients of each group of layers, when the temperature changes, the deformation of the active layer 9 is greater than that of the passive layer 10, so that the whole bimetallic strip 8 will bend to the passive layer 10 side, when the bimetallic strip 8 bends, it will push the rotation of the baffle 12, and then open the heat dissipation hole 14 to ventilate and dissipate heat, at the same time, the baffle 12 can drive the rotation of the movable shaft 11 in the positioning ring 13, when the temperature decreases, the bimetallic strip 8 returns to the original position, under the elastic recovery action of the reset spring 15, the baffle 12 returns to the initial position to continue to block the heat dissipation hole 14, so as to play the corresponding protection and shielding effect.

[0055] In addition, the two ends of the swing rod 21 are rotatably connected to the lifting block 22 and the push rod 20. One end of the push rod 20 is provided with a fixed plate 27 abutting against the inner wall of the box body 19. The counterweight 24 and the top of the inner wall of the box body 19 are connected through a telescopic rod 28. The rotatable connection of the swing rod 21 can convert the X-axis linear motion of the push rod 20 in the horizontal direction into the Y-axis motion of the lifting block 22 in the horizontal direction, and then drive the movement of the transmission assembly. The fixed plate 27 on the push rod 20 can limit the movement of the push rod 20 and provide corresponding support force for the transmission assembly. The outer wall of the push rod 20 is arc-shaped, which is conducive to the normal movement of the push rod 20 in the annular groove 16.

[0056] The accumulator 18 is arranged, and the accumulator 18 can be used as a safety backup for the rotating movable shaft 11. When the reset spring 15 is damaged, the baffle 12 connected with the movable shaft 11 cannot be reset, and the heat dissipation hole 14 cannot be blocked. When the guide rod 17 on the movable shaft 11 rotates, the guide rod 17 will be in contact with the push rod 20 and drive the push rod 20 to move. Under the rotating connection of the swing rod 21, the lifting block 22 drives the moving assembly to move upwards. The pressure energy of the compressed gas 26 in the elastic air bag 25 and the gravitational potential energy of the counterweight block 24 are converted into the pressure energy of the compressed gas 26 and the gravitational potential energy of the counterweight block 24. The push rod 20 can help the baffle 12 on the movable shaft 11 to rotate and reset, thereby playing a secondary protection role for the damaged reset spring 15, improving the product quality, and effectively improving the service life of the device.

[0057] The above is only a preferred embodiment of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can make equivalent replacements or changes according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered by the protection scope of the present application.

[0058] The above disclosed preferred embodiments of the present application are only used to help explain the present application. The preferred embodiments do not describe all the details, and the present application is not limited to the specific embodiments. Obviously, many modifications and changes can be made according to the content of the present application. The present application selects and describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can well understand and use the present application. The present application is limited by the claims and their entire scope and equivalents.

Claims

1. A safe portable power supply for AC power conversion, characterized in that, include: Assembly mechanism (1), the assembly mechanism (1) includes an upper shell (2) and a lower shell (3), the bottom of the inner wall of the lower shell (3) is provided with a contact port connected to the battery in the length direction, and heat dissipation components (6) placed in the receiving cavity are provided on both sides of the contact port. The heat dissipation assembly (6) includes a bimetallic strip (8) placed on the inner wall of the cover (7). The bimetallic strip (8) includes an active layer (9) movably connected to the inner wall of the cover (7). A passive layer (10) is installed at one end of the active layer (9). A baffle (12) is installed on the outside of the passive layer (10) and mounted on the movable shaft (11). The outer wall of the movable shaft (11) is rotatably connected in the positioning ring (13). The baffle (12) is L-shaped and has a heat dissipation hole (14) at the bottom of the cover (7) at the downward extension of the baffle (12). The connection between the movable shaft (11) and the positioning ring (13) is connected by a return spring (15). The top of the positioning ring (13) is provided with an annular groove (16), and a guide rod (17) fixed at both ends of the movable shaft (11) is movably connected to the annular groove (16). One end of the guide rod (17) is connected to an energy accumulator (18) installed on the positioning ring (13). The accumulator (18) includes a push rod (20) movably connected to the housing (19). One end of the push rod (20) is movably attached to the guide rod (17), and the other end passes through the housing (19) and is connected to the lifting block (22) through the swing rod (21). The top of the lifting block (22) is connected to the counterweight block (24) through hydraulic oil (23). The top of the counterweight block (24) is connected to the inner wall of the housing (19) through an elastic airbag (25), and the elastic airbag (25) is filled with compressed gas (26). Both ends of the swing rod (21) are mounted on the lifting block (22) and the push rod (20) by means of rotational connection. One end of the push rod (20) is provided with a fixing plate (27) that abuts against the inner wall of the box (19), and the counterweight block (24) and the top of the inner wall of the box (19) are connected by a telescopic rod (28).

2. The safe portable power supply for AC conversion according to claim 1, characterized in that, It also includes an AC conversion circuit, which includes a rectifier bridge connected to the mains power grid. A fuse is connected in series between the rectifier bridge and the mains power. The input terminal of the rectifier bridge is connected to a controller through a first capacitor C1 for grounding protection. The output terminal of the controller is connected to a first resistor R1 for grounding protection. The output terminal of the rectifier bridge is connected in parallel with a second capacitor C2 and a common-mode inductor L. The output terminal of the common-mode inductor L is connected in parallel with a third capacitor C3 and a fourth capacitor C4 and a fifth capacitor C5 connected in series. The output terminals of the fourth capacitor C4 and the fifth capacitor C5 are both grounded and connected to the controller. The output terminals of the fourth capacitor C4 and the fifth capacitor C5 are electrically connected to a transformer T. The output terminal of the transformer T is connected in parallel with a sixth capacitor C6 and a second resistor R2 through a diode D. The output terminal of the transformer is connected to the voltage output terminal.

3. A safe portable power supply for AC conversion according to claim 2, characterized in that, The controller is model CR52177.

4. A safe portable power supply for AC conversion according to claim 1, characterized in that, It also includes that the upper housing (2) is installed on the lower housing (3) by a snap-fit ​​limiting method, and a receiving cavity for placing electronic components is formed between the upper housing (2) and the lower housing (3).

5. A safe portable power supply for AC conversion according to claim 4, characterized in that, The upper shell (2) has a limit part (4) integrally formed on both sides of the bottom end. The outer wall of the limit part (4) is set in a trapezoidal shape, and the limit part (4) is connected to the limit groove on the side wall of the lower shell (3) by snap-fit ​​installation. The limit groove has a stepped opening corresponding to the limit part (4). The bottom edge of the upper shell (2) has a downward protrusion (5), and an insertion port is opened between adjacent protrusions (5). The insertion port is fixed to the insertion block on the inner wall of the lower shell (3) by plug-in installation.

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