A rechargeable portable magnetic levitation device

Abstract

The utility model discloses a kind of rechargeable portable magnetic levitation devices, including main module and levitation module.Main module integrated power unit, control unit and magnetic drive unit, power unit contains rechargeable battery, charging management module, charging management module is electrically connected Type C interface and voltage dividing resistor R65, R66;Control unit integrated hall sensor Hll, operational amplifier Op Amp and NTC thermistor;Magnetic drive unit includes fixed magnet and electromagnetic coil.Levitation module contains float shell and levitation magnet, shell is provided with bearing structure.The device volume is less than 200cm³, weight is less than 500g, can dynamically adjust levitation height, with charging safety protection function, applicable to mobile display, industrial detection and the like scene.

Description

Technical Field

[0001] This utility model relates to the field of magnetic levitation technology, specifically to a portable magnetic levitation device integrating a rechargeable power supply, a Hall sensor, and a temperature protection circuit, which is suitable for object levitation display and industrial inspection in scenarios requiring contactless support, precise position control, or movement. Background Technology

[0002] Existing magnetic levitation devices face the following technical bottlenecks in practical applications: Power dependence and charging safety defects: Traditional devices generally use external adapters for power supply and lack built-in power management modules, making them unsuitable for outdoor or mobile applications. Even those products that integrate batteries often lack temperature monitoring components (such as NTC thermistors), which could lead to safety hazards due to overheating of the lithium battery during charging. Furthermore, the absence of voltage-dividing resistors for voltage sampling makes it difficult to achieve constant current-constant voltage intelligent charging control.

[0003] Insufficient dynamic control capability for suspension: Most existing magnetic levitation devices use a fixed magnetic field design and lack a real-time position feedback mechanism. For example, they do not integrate Hall sensors to monitor the position of the float's magnetic field, making it impossible to obtain dynamic signals of the float's deflection; at the same time, they lack operational amplifiers to amplify and process the feedback signals, resulting in the electronic board being unable to accurately adjust the current of the electromagnetic coil, leading to large fluctuations in the levitation height (usually > ±2mm), making it difficult to support precision components or exhibits that require high stability.

[0004] Structural integration and portability limitations: Traditional devices have independent control circuits, power modules, and magnetic levitation modules, with volumes generally exceeding 500 cubic centimeters and weights exceeding 1 kg. They also lack detachable structures, requiring transport as a whole. Furthermore, the float's load-bearing method is limited to flat support, making it unsuitable for diverse load requirements such as magnetic attraction and clamps.

[0005] The core deficiency of existing technologies lies in the failure to integrate dynamic magnetic field adjustment components (Hall sensors, operational amplifiers) and charging protection components (NTC, voltage divider resistors) with the portable structure, resulting in insufficient stability, safety, and applicability of the device in mobile scenarios. There is a need to provide a rechargeable portable magnetic levitation device that forms a closed-loop feedback control and charging safety system, fundamentally solving the problems of existing technologies. Utility Model Content

[0006] The purpose of this invention is to provide a magnetic levitation device with dynamic magnetic field adjustment, charging temperature protection and portability. By integrating a Hall sensor, operational amplifier and negative temperature coefficient thermistor (NTC), it solves the problems of insufficient stability and safety hazards of traditional devices.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a rechargeable portable magnetic levitation device, comprising: a main body module and a levitation module; the main body module integrates a power supply unit, a control unit, and a magnetic drive unit, and the levitation module is levitated above the main body module by a magnetic field; the power supply unit supports external charging and supplies power to the control unit and the magnetic drive unit.

[0008] As a further improvement to the technical solution of this utility model, the power supply unit includes a rechargeable battery and a charging management module. The charging management module is electrically connected to a charging interface, which is a Type-C interface or other universal charging interface. The charging management module includes voltage divider resistors R65 and R66, which are used to detect the battery voltage and adjust the charging current.

[0009] As a further improvement to the technical solution of this utility model, the surface of the main module is provided with a status indicator unit, which is electrically connected to the charging management module and is used to display the charging status or working status.

[0010] As a further improvement to the technical solution of this utility model, the magnetic drive unit includes a fixed magnet and an electromagnetic coil, the electromagnetic coil being arranged around the fixed magnet; the control unit includes a Hall sensor for real-time detection of the magnetic field position signal of the levitation module, and amplifies the signal through an operational amplifier to adjust the current intensity of the electromagnetic coil.

[0011] As a further improvement to the technical solution of this utility model, the suspension module includes a float shell and a suspension magnet. The suspension magnet is embedded in the float shell and is arranged opposite to the magnetic pole of the fixed magnet of the main body module. The surface of the float shell is provided with a bearing structure.

[0012] As a further improvement to the technical solution of this utility model, the supporting structure is one or more combinations of a planar support platform, a clamp, or a magnetic interface, used to support different types of objects to be suspended.

[0013] As a further improvement to the technical solution of this utility model, the main module includes a detachably connected upper cover, a main body base, and a bottom cover. The upper cover is provided with a start / stop switch, which is electrically connected to the control unit to control the on / off state of the device.

[0014] As a further improvement to the technical solution of this utility model, the control unit integrates overcharge protection, over-discharge protection and short-circuit protection circuits, and the rechargeable battery is a lithium battery; the overcharge protection circuit includes a negative temperature coefficient thermistor, which is used to monitor the temperature of the lithium battery and trigger over-temperature protection.

[0015] As a further improvement to the technical solution of this utility model, the overall volume of the main module and the suspension module is less than 200 cubic centimeters and the weight is less than 500 grams, which meets the size and weight standards of portable devices.

[0016] As a further improvement to the technical solution of this utility model, the levitation height of the levitation module can be adjusted by the control unit, with an adjustment range of 1-10 cm.

[0017] This utility model has the following beneficial effects: The accuracy of dynamic suspension control has been significantly improved: By integrating a Hall sensor Hll and an operational amplifier Op Amp, a closed-loop feedback system of "magnetic field position detection - signal amplification - current adjustment" is established, achieving stable control within a fluctuation range of ±0.5mm in suspension height. This improves accuracy by more than 75% compared to traditional fixed magnetic field devices and is suitable for non-contact detection of precision components.

[0018] The charging safety protection mechanism is comprehensive: The charging management module incorporates voltage divider resistors R65 and R66 (10KΩ) and an NTC thermistor, forming a dual protection system of "voltage sampling - temperature monitoring". The voltage divider resistor monitors the battery voltage in real time, and works with the operational amplifier to achieve constant current-constant voltage intelligent charging, avoiding the risk of battery bulging caused by overcharging and extending the cycle life of lithium batteries to more than 800 times; The NTC thermistor is in close contact with the battery surface. When the temperature is ≥60℃, it cuts off the charging circuit within 0.1 seconds, which is 50% faster than the traditional temperature control solution and effectively reduces the risk of overheating and fire.

[0019] Power management efficiency optimization: The Type-C charging port is compatible with mainstream fast charging protocols. Combined with the precise voltage sampling of the voltage divider resistor, the charging efficiency is 30% higher than that of the traditional USB port (a 2000mAh battery can be fully charged in just 2.5 hours). The built-in lithium battery supports more than 6 hours of offline work, and with a lightweight design of ≤500g, it meets the needs of 8 hours of continuous operation for outdoor exhibitions, mobile offices, etc.

[0020] Multifunctional support and scene adaptation: The float housing integrates a magnetic interface (attraction force ≥1N) and a clamp mounting hole (M3 specification). Combined with the dynamic adjustment capability of the Hall sensor, it can stably support different types of objects weighing 20-200g. Metal exhibits can be quickly installed using magnetic interfaces, avoiding the wear and tear caused by traditional snap-fit ​​structures. After industrial components are fixed by a fixture, they can be laser scanned at a suspension height of 2mm, improving detection efficiency by 40%.

[0021] Modular design facilitates maintenance and upgrades: The main module adopts a detachable top cover, main body base and bottom cover structure, and the core components such as Hall sensors and operational amplifiers are all standardized plug-in designs. Faulty components can be quickly replaced during maintenance (e.g., Hall sensor replacement time < 5 minutes). In the future, by upgrading the operational amplifier model, the hover height adjustment speed can be improved to the 100ms level, adapting to high-speed dynamic scenarios. Attached Figure Description

[0022] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 is a three-dimensional structural diagram of a rechargeable portable magnetic levitation device according to the present invention; Figure 2 This is a top view of the rechargeable portable magnetic levitation device of this utility model; Figure 3 for Figure 2 AA section view; Figure 4 This is an exploded structural diagram of the main module of this utility model; Figure 5 This is a three-dimensional structural diagram of the suspension module of this utility model; Figure 6 This is one of the power management circuits of this utility model; Figure 7 This is the second power management circuit of this utility model; Figure 8 This is one of the magnetic levitation position detection circuits of this utility model; Figure 9 This is the second type of magnetic levitation position detection circuit of this utility model; Figure 10 for Figure 9 One of the enlarged schematic diagrams; Figure 11 for Figure 9 The second enlarged schematic diagram.

[0023] In the attached diagram: 1-Main module; 2-Suspension module; 3-Power supply unit; 4-Control unit; 5-Magnetic drive unit; 11-Top cover; 12-Main body base; 13-Bottom cover; 21-Float housing; 22-Suspension magnet; 31-Rechargeable battery; 32-Charging interface; 51-Fixed magnet; 52-Electromagnetic coil; 53-Electronic board. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0025] It should be noted that all directional indicators (such as up, down, left, right, front, back, upper end, lower end, top, bottom, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0026] In this utility model, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination should be considered non-existent and not within the scope of protection claimed by this utility model.

[0028] The present invention will be further described in detail below with reference to the accompanying drawings.

[0029] Reference Figures 1 to 11 A rechargeable portable magnetic levitation device includes: a main body module 1 and a levitation module 2; the main body module 1 integrates a power supply unit 3, a control unit 4 and a magnetic drive unit 5; the levitation module 2 is connected to the main body module 1 in a non-contact manner through a magnetic field; the power supply unit 3 supports external charging and supplies power to the control unit 4 and the magnetic drive unit 5.

[0030] Specifically, in this embodiment, the power supply unit 3 includes a rechargeable battery 31 and a charging management module. The charging management module is electrically connected to a charging interface 32, which is a Type-C interface or other universal charging interface. The charging management module includes voltage divider resistors R65 and R66, used to detect the battery voltage and adjust the charging current. It should be noted that the rechargeable battery 31 is a rechargeable lithium battery, and the charging management module is electrically connected to a Type-C charging interface (located on the outside of the main body). The voltage divider resistors R65 and R66 (both with a resistance of 10KΩ) built into the charging management module are connected in series with the lithium battery to form a voltage sampling circuit. An operational amplifier (Op Amp) compares the sampled voltage with a reference voltage to dynamically adjust the charging current, achieving constant current-constant voltage charging control.

[0031] Specifically, in this embodiment, the surface of the main module 1 is provided with a status indicator unit (not shown), which is electrically connected to the charging management module and is used to display the charging status or working status.

[0032] Specifically, in this embodiment, the magnetic drive unit 5 includes a fixed magnet 51 and electromagnetic coils 52. Multiple electromagnetic coils 52 are arranged around the fixed magnet 51. The control unit 4 includes a Hall sensor for real-time detection of the magnetic field position signal of the levitation module 2, and amplifies the signal using an operational amplifier to adjust the current intensity of the electromagnetic coils 52. It should be noted that the control unit 4 integrates a Hall sensor H11 for real-time detection of changes in the magnetic field intensity of the float magnet, outputting a 0-5V analog signal to the operational amplifier. The operational amplifier amplifies the signal by 10-50 times (default 20 times) and transmits it to the electronic board to adjust the current intensity of the electromagnetic coils 52, achieving dynamic calibration of the levitation height. The magnetic drive unit 5 consists of a fixed magnet 51 (the main magnet) and electromagnetic coils 52 arranged around it. The electromagnetic coils 52 are powered by the electronic board 53 and form an electromagnetic repulsive / attractive force with the float magnet. The Hall sensor H11 has a detection accuracy of 0.1mT, and in conjunction with the signal amplification function of the operational amplifier, achieves stable control within a fluctuation range of ±0.5mm in the levitation height.

[0033] Specifically, in this embodiment, the levitation module 2 includes a float housing 21 and a levitation magnet 22. The levitation magnet 22 is embedded in the float housing 21 and is positioned opposite to the magnetic poles of the fixed magnet 51 of the main module 1. The surface of the float housing 21 is provided with a load-bearing structure. It should be noted that the float housing 21 is made of lightweight ABS material (density 1.05 g / cm³), and a neodymium iron boron levitation magnet 22 (remanence 1.2 T) is embedded inside, facing the magnetic poles of the fixed magnet 51 of the main module 1.

[0034] Specifically, in this embodiment, the supporting structure is one or more combinations of a planar support platform, a clamp, or a magnetic interface, used to support different types of objects to be suspended. It should be noted that the float housing 21 has a magnetic interface (with a built-in ferrite magnetic plate, suction force ≥1N) at the top, and M3-sized clamp mounting holes are reserved on the side to accommodate the adsorption of metal exhibits or the fixing of industrial components.

[0035] Specifically, in this embodiment, the main module 1 includes a detachably connected upper cover 11, a main body base 12, and a bottom cover 13. The upper cover 11 is provided with a start / stop switch, which is electrically connected to the control unit 4 to control the on / off state of the device.

[0036] Specifically, in this embodiment, the control unit 4 integrates overcharge protection, over-discharge protection, and short-circuit protection circuits, and the rechargeable battery 31 is a lithium battery. The overcharge protection circuit includes a negative temperature coefficient thermistor (NTC) for monitoring the lithium battery temperature and triggering over-temperature protection. It should be noted that the NTC thermistor is positioned close to the surface of the lithium battery. When the detected temperature is ≥60℃, the charging management module cuts off the charging circuit, triggering over-temperature protection.

[0037] Specifically, in this embodiment, the overall volume of the main module 1 and the suspension module 2 is less than 200 cubic centimeters and the weight is less than 500 grams, which meets the size and weight standards for portable devices.

[0038] Specifically, in this embodiment, the levitation height of the levitation module 2 can be adjusted by the control unit 4, with an adjustment range of 1-10 cm.

[0039] Implementation Case: Reference Figures 6 to 11 1. Charging and Temperature Protection Procedures Charging phase: The charging management module first detects the lithium battery voltage via resistors R65 and R66 after connecting to a 5V power supply through a Type-C interface. If the voltage is less than 3V, the operational amplifier will charge at a constant current of 0.5A, and the indicator light will illuminate red. If the voltage is ≥4.2V, switch to constant voltage charging. When the current gradually decreases to 0.05A, it is considered fully charged, and the indicator light turns green.

[0040] Temperature protection: NTC thermistor for real-time battery temperature monitoring: When the temperature is ≥55℃, the operational amplifier outputs a current-reducing signal to limit the charging current to 0.2A; When the temperature is ≥60℃, the control unit 4 cuts off the charging circuit, and the indicator light flashes red. It needs to be manually reset to restore the circuit.

[0041] 2. Dynamic control process of magnetic levitation Startup initialization: When the main switch is turned on, the electronic board 53 supplies power to the electromagnetic coil 52, and the fixed magnet 51 and the float magnet form an initial magnetic field (repulsive force of about 0.3N). The Hall sensor Hll detects the initial position of the float. The operational amplifier amplifies the signal by 20 times by default. The electronic board 53 adjusts the coil current to the reference value required for stable levitation (such as 50mA) through PWM technology.

[0042] Dynamic adjustment logic: When the float sinks (distance from the main body 12 < set height), the magnetic field strength of the float magnet increases (ΔB≥0.05mT), the Hall sensor output voltage >2.5V, and after being amplified by the operational amplifier, it causes the electronic board 53 to increase the current to 60mA, thereby enhancing the repulsive force; When the float rises (distance from the main body 12 > set height), the magnetic field strength decreases (ΔB≤-0.05mT), the output voltage is <2.5V, the current decreases to 40mA, and the repulsive force is weakened; The operational amplifier amplification factor (10-50 times) can be manually set via the side adjustment knob to meet the suspension accuracy requirements of different load weights (≤200g).

[0043] 3. Typical Application Scenarios Outdoor exhibition display: The float housing 21 can attach 50g of metal exhibits via a magnetic interface. The built-in lithium battery (capacity 2000mAh) supports continuous levitation for 6 hours. The Hall sensor corrects positional shifts caused by environmental vibrations in real time. Industrial non-contact inspection: A 100g electronic component is fixed by a fixture, the suspension height is adjusted to 2mm, and the amplification factor of the operational amplifier is set to 30 times to achieve micron-level stable control of the suspension attitude, which is convenient for laser scanning inspection.

[0044] The working principle of this utility model: 1. Charging Management Principles The charging process achieves constant current-constant voltage control through voltage divider resistors R65 and R66 and operational amplifier Op Amp. Voltage sampling: Voltage divider resistors R65 and R66 (both with a resistance of 10KΩ) are connected in series in the lithium battery charging circuit to perform real-time voltage divider sampling of the battery voltage and output the sampled voltage to the inverting input of the operational amplifier; Mode switching: The operational amplifier compares the sampled voltage with the reference voltage (preset 4.2V): When the battery voltage is <3.6V, a high-level signal is output to control the charging circuit to charge in constant current mode (0.5A); When the battery voltage is ≥4.2V, a low-level signal is output to switch to constant voltage mode (4.2V) until the charging current drops below 0.05A, which is considered a full charge. Temperature intervention: The negative temperature coefficient thermistor (NTC) monitors the lithium battery temperature in real time. When the temperature is ≥55℃, its resistance decreases, triggering the operational amplifier to output a current reduction signal, limiting the charging current to 0.2A; when the temperature is ≥60℃, the charging circuit is directly cut off.

[0045] 2. Principle of Dynamic Control of Magnetic Levitation A closed-loop feedback control is formed by Hall sensor Hll, operational amplifier Op Amp, and electromagnetic coil 52: Magnetic field detection: Hall sensor Hll (sensitivity 0.1mT) detects the change in magnetic field strength of the float magnet in real time and outputs an analog voltage signal (0-5V) that is linearly related to the position of the float. The voltage increases when the float is close to the main body 12 and decreases when it is far away. Signal amplification: The operational amplifier Op Amp amplifies the Hall sensor output signal by 10-50 times (default 20 times) to enhance the signal strength and drive the electronic board 53 control module; Current adjustment: Electronic board 53 adjusts the current of electromagnetic coil 52 according to the amplified signal. When the float sinks (voltage > 2.5V), the current is increased to 60mA to enhance the magnetic repulsion. When the float rises (voltage < 2.5V), reduce the current to 40mA to weaken the magnetic repulsive force. By dynamically adjusting the current, the float is maintained at the set suspension height (accuracy ±0.5mm).

[0046] 3. Security Protection Coordination Mechanism Overcharge protection: When the battery voltage exceeds 4.3V or the temperature exceeds 60℃ during charging, the operational amplifier outputs a cut-off signal, and the indicator light flashes red to stop charging; Undervoltage protection: When the lithium battery voltage is lower than 2.8V, the electronic board 53 automatically shuts off the power supply to the magnetic drive unit 5 to prevent the battery from being damaged by over-discharge; Short circuit protection: The control unit 4 has a built-in fuse (not shown) that blows within 0.1 seconds when a short circuit in the coil or charging circuit is detected.

[0047] In summary, this utility model has the following beneficial effects: The accuracy of dynamic suspension control has been significantly improved: By integrating a Hall sensor Hll and an operational amplifier Op Amp, a closed-loop feedback system of "magnetic field position detection - signal amplification - current adjustment" is established, achieving stable control within a fluctuation range of ±0.5mm in suspension height. This improves accuracy by more than 75% compared to traditional fixed magnetic field devices and is suitable for non-contact detection of precision components.

[0048] The charging safety protection mechanism is comprehensive: The charging management module incorporates voltage divider resistors R65 and R66 (10KΩ) and an NTC thermistor, forming a dual protection system of "voltage sampling - temperature monitoring". The voltage divider resistor monitors the battery voltage in real time, and works with the operational amplifier to achieve constant current-constant voltage intelligent charging, avoiding the risk of battery bulging caused by overcharging and extending the cycle life of lithium batteries to more than 800 times; The NTC thermistor is in close contact with the battery surface. When the temperature is ≥60℃, it cuts off the charging circuit within 0.1 seconds, which is 50% faster than the traditional temperature control solution and effectively reduces the risk of overheating and fire.

[0049] Power management efficiency optimization: The Type-C charging port is compatible with mainstream fast charging protocols. Combined with the precise voltage sampling of the voltage divider resistor, the charging efficiency is 30% higher than that of the traditional USB port (a 2000mAh battery can be fully charged in just 2.5 hours). The built-in lithium battery supports more than 6 hours of offline work, and with a lightweight design of ≤500g, it meets the needs of 8 hours of continuous operation for outdoor exhibitions, mobile offices, etc.

[0050] Multifunctional support and scene adaptation: The float housing 21 integrates a magnetic interface (attraction force ≥1N) and a clamp mounting hole (M3 specification). Combined with the dynamic adjustment capability of the Hall sensor, it can stably support different types of objects weighing 20-200g. Metal exhibits can be quickly installed using magnetic interfaces, avoiding the wear and tear caused by traditional snap-fit ​​structures. After industrial components are fixed by a fixture, they can be laser scanned at a suspension height of 2mm, improving detection efficiency by 40%.

[0051] Modular design facilitates maintenance and upgrades: The main module 1 adopts a structure consisting of a detachable top cover 11, a main body base 12, and a bottom cover 13. Core components such as Hall sensors and operational amplifiers are all standardized plug-in designs. Faulty components can be quickly replaced during maintenance (e.g., Hall sensor replacement time < 5 minutes). In the future, by upgrading the operational amplifier model, the hover height adjustment speed can be improved to the 100ms level, adapting to high-speed dynamic scenarios.

[0052] The technical solutions provided by the embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the embodiments of this utility model. The description of the above embodiments is only for helping to understand the principles of the embodiments of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the embodiments of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A rechargeable portable magnetic levitation device, characterized in that, include: The main module and the levitation module are: a main module and a levitation module; the main module integrates a power supply unit, a control unit and a magnetic drive unit, and the levitation module is levitated above the main module by a magnetic field; the power supply unit supports external charging and supplies power to the control unit and the magnetic drive unit. The power supply unit includes a rechargeable battery and a charging management module. The charging management module is electrically connected to a charging interface, which is a Type-C interface or other universal charging interface. The charging management module includes voltage divider resistors R65 and R66, which are used to detect the voltage of the rechargeable battery and adjust the charging current. The magnetic drive unit includes a fixed magnet and an electromagnetic coil, with the electromagnetic coil arranged around the fixed magnet; the control unit includes a Hall sensor for real-time detection of the magnetic field position signal of the levitation module, and amplifies the signal through an operational amplifier to adjust the current intensity of the electromagnetic coil. The levitation module includes a float housing and a levitation magnet. The levitation magnet is embedded in the float housing and is arranged opposite to the magnetic poles of the fixed magnet. The surface of the float housing is provided with a load-bearing structure. The control unit integrates an overcharge protection circuit, an over-discharge protection circuit, and a short-circuit protection circuit. The rechargeable battery is a lithium battery. The overcharge protection circuit includes a negative temperature coefficient thermistor, which is used to monitor the temperature of the lithium battery and trigger over-temperature protection.

2. The rechargeable portable magnetic levitation device according to claim 1, characterized in that: The main module has a status indicator unit on its surface. The status indicator unit is electrically connected to the charging management module and is used to display the charging status or working status.

3. The rechargeable portable magnetic levitation device according to claim 1, characterized in that: The supporting structure is one or more combinations of a planar support platform, a clamp, or a magnetic interface, used to support different types of objects to be suspended.

4. A rechargeable portable magnetic levitation device according to claim 1, characterized in that: The main module includes a detachably connected upper cover, a main body base, and a bottom cover. The upper cover is equipped with a start / stop switch, which is electrically connected to the control unit to control the on / off state of the device.

5. A rechargeable portable magnetic levitation device according to claim 1, characterized in that: The overall volume of the main module and the suspension module is less than 200 cubic centimeters, and the weight is less than 500 grams.

6. A rechargeable portable magnetic levitation device according to claim 1, characterized in that: The levitation height of the levitation module can be adjusted by the control unit, with an adjustment range of 1-10 cm.

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