Magnetic flat-panel computer charger

Abstract

The utility model discloses a kind of magnetic flat-panel computer chargers, belong to electronic equipment charging technical field, it includes shell, cover and power cord or socket, shell inside is equipped with mainboard groove, stylus groove, magnet groove and wire groove, respectively mounted with PCB board, magnet, power cord and PCB board electrically connected, stylus and PCB board electrically connected, overall is the sheet shape structure of thickness≤8mm.Magnet groove is distributed in stylus groove, mainboard groove two sides, near power cord side magnet quantity is more than opposite side to offset cable gravity;Shell, cover adopt aluminum alloy material, corner is round angle design, surface anodic oxidation treatment;PCB board integrates overvoltage protection circuit, temperature sensing module and intelligent identification chip.This charger magnetism suction is stable, heat dissipation is efficient, interface is durable, light and thin solid and intelligent safety, radiate fast, with portability and reliability.

Description

Technical Field

[0001] This utility model relates to the field of electronic device charging technology, specifically to a magnetic tablet computer charger. Background Technology

[0002] With the widespread use of mobile electronic devices, tablets have become essential tools for work, study, and entertainment. However, their accompanying chargers still have the following significant drawbacks:

[0003] Traditional chargers use USB-C or Lightning interfaces for plug-and-play connections. Prolonged use can easily lead to interface wear, poor contact, and even damage to the tablet's charging port due to improper force. According to a report by the China Electronics Technology Standardization Institute, plug-and-play interfaces have an average lifespan of about 5,000 cycles, while tablet users typically charge their devices 2-3 times a day. Therefore, interface wear and tear accounts for over 45% of all malfunctions.

[0004] Tablet charging power is generally between 18W and 100W. During charging, the internal PCB board and power components of the charger are prone to generating high heat. Existing plastic-cased chargers have low heat dissipation efficiency. In actual tests, the surface temperature can reach over 55°C after one hour of continuous charging. This not only accelerates component aging but also poses a risk of burns.

[0005] In pursuit of thinness and portability, some chargers sacrifice structural strength, causing them to shift during charging due to cable weight or slight contact, affecting charging stability. Non-magnetic chargers rely on manual alignment of the interface, which is prone to alignment errors in low light or when operating with one hand, making them particularly inconvenient for children and the elderly.

[0006] While existing magnetic charging solutions have partially solved the plugging and unplugging problem, they still have the following shortcomings:

[0007] The magnetic charging design is flawed: most products use a single magnet, which cannot balance the weight of the cable, making it prone to tilting or falling off during charging. To address this, a magnetic tablet charger is proposed to solve these problems. Utility Model Content

[0008] To address the shortcomings of existing technologies, this utility model provides a magnetic tablet charger, the core objectives of which include: achieving stable adsorption through a multi-magnet array layout to counteract the influence of power cord gravity; adopting an integrated, thin and light design to balance portability and structural strength; and optimizing the contact structure to improve the reliability and ease of use of the charging connection.

[0009] This utility model provides a magnetic tablet charger, including a shell, a cover plate, and a power cord. The cover plate fits snugly onto the shell. The shell's interior has a motherboard slot, a pin slot, a magnet slot, and a wire slot. A PCB board is mounted in the motherboard slot, a pin plate is mounted in the pin slot with pins on it, and magnets are installed in the magnet slot. The power cord is electrically connected to the PCB board via the wire slot, and the pins are electrically connected to the PCB board. The overall structure is a thin sheet with a thickness of ≤8mm. This technical solution achieves hardware integration for magnetic charging through a modular layout. Pins replace traditional plug-in interfaces, solving problems of interface wear and poor contact. The overall thickness of ≤8mm meets the needs of mobile scenarios, improving portability. Simultaneously, the thin sheet structure increases the heat dissipation area, and the use of thermally conductive materials further optimizes heat dissipation efficiency.

[0010] Optionally, a socket is also installed on one side of the housing, and the PCB board is electrically connected to the socket.

[0011] Further describing the aforementioned solution, the magnet slots are distributed on both sides of the pin slot and the motherboard slot, with more magnets on the side closer to the power cable than on the other side. This difference in the number of magnets counteracts the influence of the power cable's gravity. This counteracting of cable gravity prevents the charger from tilting or falling off due to cable pulling during charging. The multi-magnet array forms a three-dimensional magnetic field, enhancing the adhesion and ensuring stable connection during charging, reducing the risk of interruption due to slight contact.

[0012] Further describing the aforementioned solution, the housing and cover are made of aluminum alloy with rounded corners. Aluminum alloy has a high thermal conductivity of approximately 205 W / m·K, which, compared to traditional plastic housings, can quickly dissipate heat from the PCB board, power devices, and internal computer components, reducing surface temperature, delaying component aging, and minimizing the risk of burns. The aluminum alloy material enhances overall rigidity, avoiding the structural fragility inherent in thin and light designs; the rounded corners reduce sharp edges, lowering the risk of impact damage and conforming to ergonomic principles.

[0013] Further description of the aforementioned solution: the stylus is made of phosphor bronze with a gold-plated surface. The plating thickness is ≥3μm and the contact resistance is ≤5mΩ. The distance between the tip of the stylus and the outer surface of the shell is 0.3-0.8mm. This not only avoids the safety hazards caused by accidental contact of the exposed stylus, but also ensures that the stylus can reliably contact the charging contacts of the tablet computer when magnetically attracted, thus balancing safety and connection reliability.

[0014] Further description of the aforementioned solution: the PCB board integrates an overvoltage protection circuit, a temperature sensing module, and an intelligent identification chip. The overvoltage protection circuit can withstand instantaneous voltage ≤40V, and the temperature sensing module automatically reduces the charging power when the temperature is ≥60℃.

[0015] Further describing the aforementioned solution, the housing and cover are sealed by snap-fit, ultrasonic welding, or adhesive bonding. This sealed design effectively prevents dust and liquids from entering the internal circuitry, improving the charger's durability in complex environments and ensuring that the housing and cover do not loosen or detach during long-term use.

[0016] Further describing the aforementioned solution, the power cord is introduced into the housing through a cable tray, with a stress-relieving ring at the tray entrance. The stress-relieving ring, employing a rubber buffer ring or a metal anti-bending structure, alleviates bending stress on the power cord at the entrance, preventing internal cable breakage or outer sheath damage due to frequent bending. Optionally, the housing surface is anodized. The porous structure of the anodized layer increases the surface area, aiding heat conduction; the surface hardness reaches 20HV or higher, resisting daily scratches, maintaining an intact appearance, and extending product lifespan.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] Stable and reliable magnetic attraction: The asymmetric magnet array design offsets the weight of the cable through the difference in the number of magnets. The attraction force is ≥2N, the automatic alignment error is ≤0.2mm, and the tilt angle is <5°, which solves the problems of difficult alignment and easy fall-off of traditional plugging and unplugging.

[0019] Significantly improved heat dissipation efficiency: The aluminum alloy shell reduces the surface temperature by more than 10°C compared to traditional plastic chargers (continuous charging ≤45°C). Combined with an intelligent temperature control module, it slows down component aging and eliminates the risk of burns.

[0020] Doubled interface lifespan: Gold-plated phosphor bronze contacts replace plug-in interfaces, supporting ≥100,000 magnetic contacts with zero wear and contact impedance ≤5mΩ, fundamentally solving the 45% charging failure caused by interface damage.

[0021] Lightweight and sturdy: thickness ≤8mm, weight ≤50g, meeting portability requirements; aluminum alloy anodized shell with a hardness of over 20HV, increasing structural strength by 40%, taking into account both drop resistance and wear resistance as well as IP54 dust and water resistance.

[0022] Intelligent safety upgrade: It integrates overvoltage protection and power adaptive chip, can withstand 40V instantaneous voltage and automatically match 18W-100W power, and the power cord stress relief ring reduces the risk of breakage by 90%, comprehensively improving the safety and durability of use. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is an overall schematic diagram of an embodiment of the present utility model;

[0025] Figure 2 An exploded view diagram provided for an embodiment of this utility model;

[0026] Figure 3 Another overall schematic diagram provided for an embodiment of this utility model;

[0027] Figure 4 , 5 An exploded view diagram provided for an embodiment of this utility model;

[0028] Figure 6 This is a schematic diagram illustrating the use of this utility model according to an embodiment.

[0029] The following are the labeling elements in the figure:

[0030] 1. Housing; 11. Motherboard slot; 12. Stylus slot; 13. Magnet slot; 14. Cable channel; 15. Connector; 2. Cover plate; 3. PCB board; 4. Stylus board; 41. Stylus; 5. Magnet; 6. Power cord; 7. Tablet PC.

[0031] The accompanying drawings have illustrated specific embodiments of the present invention, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0033] To make the technical solution and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0034] The magnetic tablet charger provided by this utility model is based on Figures 1-6 The structure shown is innovative in its functionality through an integrated ultra-thin design, asymmetrical magnetic layout, and three-dimensional heat conduction path. The following sections will elaborate on its structural components, manufacturing process, functional implementation, and performance verification.

[0035] In this embodiment, the housing 1 and cover plate 2 are made of 6061-T6 aluminum alloy, utilizing its high thermal conductivity of 205 W / m·K to construct the basic heat dissipation frame, and are processed into a housing body including a motherboard slot 11, a magnet slot 13, and a wire slot 14. The shape of the housing 1 includes square, elliptical, and circular shapes. The surface of the housing 1 is treated with sulfuric acid anodizing to form a porous oxide film with a thickness ≥20 μm and a hardness of ≥20 HV. This film not only increases the heat dissipation surface area but also provides wear-resistant and corrosion-resistant protection.

[0036] The sealing between the cover plate 2 and the housing 1 is achieved through three optional processes: For removable maintenance scenarios, a hook-shaped buckle structure with a spacing of 5-8mm is used. During assembly, pressing causes the buckle to elastically engage with the slot, resulting in a sealing gap of ≤0.1mm; If a high-reliability seal is required, 200-300N pressure can be applied to the joint using a 20kHz ultrasonic welding device, and a molecular-level bond can be formed after 0.5-1.0s welding, achieving a waterproof rating of IP54; Thermally conductive silicone is applied to the sealing surface of the housing, with a layer width of 3-5mm and a thickness of 0.2-0.3mm. After curing at room temperature for 24 hours, it combines sealing and thermal conductivity functions, making it suitable for scenarios that require both heat dissipation and protection.

[0037] The PCB board 3 is 1.6mm thick and precisely fits the motherboard slot 11. It integrates an overvoltage protection circuit, a temperature sensing module, and a smart identification chip: The overvoltage protection circuit consists of a TVS diode and a fuse, which can withstand instantaneous voltage of ≤40V and cut off the power supply within 0.1μs in case of voltage abnormality; The temperature sensing module monitors the temperature in real time through an NTC thermistor (accuracy ±1%). When the temperature is ≥60℃, it controls the charging chip to reduce the power output within 5s through a PWM signal, with a cooling rate of ≥5℃ / minute; The smart identification chip can be the TI BQ25896, which supports the PD 3.0 protocol and can automatically identify the tablet model and match the charging power of 18W-100W within 200ms.

[0038] like Figure 4 , 5 As shown, some embodiments may employ a separate contact plate 4. The contact plate 4 uses an FR-4 epoxy resin substrate with an immersion gold finish to improve welding reliability. The contact pin 41 is made of C5210 phosphor bronze, with a hemispherical head formed by progressive die stamping, and then a cyanide gold plating process is used to form a plating layer ≥3μm thick with a purity ≥99.9%. It shows no corrosion after 48 hours of salt spray testing and has a contact resistance ≤5mΩ. During assembly, the distance between the tip of the contact pin and the outer surface of the housing is precisely controlled within the range of 0.3-0.8mm using a fixture, avoiding accidental contact due to exposure and ensuring reliable contact with the flat contact point during magnetic attraction.

[0039] Magnet slots 13 are distributed on both sides of the pin slots 12 and the motherboard slot 11, employing an asymmetrical array design to counteract the gravity of the power cord. In this embodiment, nine N52 neodymium iron boron magnets are installed on the side closest to the power cord 6, and five magnets of the same specification are installed on the opposite side. Two N52 neodymium iron boron magnets are symmetrically distributed on both sides of the pin slots 12. The magnets are fixed in the slots with thermally conductive adhesive, such as 3M DP420, forming an opposite-polarity attraction with the magnet at the end of the tablet computer 7.

[0040] In this embodiment, the power cord 6 uses a USB-C interface cable supporting the 100W PD protocol. The cable is introduced into the housing 1 through the cable groove 14, and a stress relief structure can be provided at the inlet: a silicone rubber buffer ring can be selected to absorb bending stress through elastic deformation; or a stainless steel spring sleeve can be used, with one end fixed to the housing 1 and the other end wrapped around the cable. The power cord 6 is connected to the PCB board 3 through crimp terminals. Of course, if... Figure 3 As shown, power cord 6 can be removed and replaced with socket 15.

[0041] In this embodiment, the contact surface between the PCB board 3 and the mainboard slot 11 is coated with 3.0 W / m·K thermal grease, which can handle 40% of the heat dissipation load; the substrate of the contact pin plate 4 is in direct contact with the aluminum alloy wall of the contact pin slot 12, conducting 30% of the heat; the magnet 5 assists in heat dissipation through the side wall of the magnet slot 13, accounting for 20%. The sheet-like structure increases the surface area / volume ratio by 3 times, and combined with the porous structure of the anodized film on the shell, the air convection heat dissipation efficiency is 50% higher than that of traditional cubic chargers.

[0042] During installation, first calibrate the height of the contact pins on the contact plate using a fixture to ensure that the top spacing tolerance is ≤ ±0.05mm. Then, attach the magnets 5 to the magnet slots 13 according to the layout. Next, insert the PCB board 3 into the main board slot 11 and fix it with M1.6×3mm screws. After the power cable 6 passes through the stress relief ring and the wire slot 14, the terminal is soldered to the PCB board 3. The contact pin plate 4 is embedded into the contact pin slot 12 and fixed with clips or glue, ensuring that the contact pins 41 are aligned with the PCB solder joints. Finally, complete the cover plate assembly according to the selected sealing process (clip / solder / gluing).

[0043] During use, the charger magnetically contacts the tablet 7 via an asymmetric magnet array. The magnetic torque generated by multiple magnets on the rear counteracts the gravity of the power cord, achieving automatic alignment (error ≤ 0.2mm) and stable adsorption (adsorption force ≥ 2N). After the contact pin 41 contacts the charging contacts of the tablet 7, the intelligent identification chip automatically matches the charging power, and the overvoltage protection circuit and temperature sensing module monitor electrical safety in real time. The aluminum alloy shell quickly dissipates internal heat, and combined with the intelligent temperature control module, ensures that the component operating temperature is within a safe range. Compared to traditional chargers, this solution increases the interface lifespan from 5,000 insertion / removal cycles to ≥ 100,000 magnetic contacts, improves structural strength by 40%, and achieves IP54 dust and water resistance, comprehensively optimizing the user experience and reliability.

[0044] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the foregoing claims.

[0045] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element present. Conversely, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations. The terms "upper end," "lower end," "left side," "right side," "front end," "rear end," and similar expressions used herein refer to the positional relationship with reference to the accompanying drawings.

[0046] It should be understood that this invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this invention is limited only by the appended claims.

Claims

1. A magnetic tablet charger, characterized in that: The device includes a housing (1) and a cover plate (2), the cover plate (2) covering the housing (1). The housing (1) has a motherboard slot (11) and a magnet slot (13) inside. A PCB board (3) is installed in the motherboard slot (11) and a magnet (5) is installed in the magnet slot (13). The device also includes a stylus (41) electrically connected to the PCB board (3). It also includes a wire groove (14) and a stylus groove (12). A stylus plate (4) is installed in the stylus groove (12), and a stylus (41) is provided on the stylus plate (4). A power cord (6) is installed in the wire groove (14), and the power cord (6) is electrically connected to the PCB board (3) through the wire groove (14). The magnet slots (13) are distributed on both sides of the stylus slot (12) and the motherboard slot (11). The number of magnets (5) on the side closer to the power line (6) is greater than that on the other side. The difference in the number of magnets (5) offsets the influence of gravity on the power line (6).

2. The magnetic tablet charger according to claim 1, characterized in that: A socket (15) is also installed on one side of the housing (1), and the PCB board (3) is electrically connected to the socket (15).

3. The magnetic tablet charger according to claim 1, characterized in that: The shell (1) and cover plate (2) are made of aluminum alloy and have rounded corners.

4. The magnetic tablet charger according to claim 1, characterized in that: The stylus (41) is made of phosphor bronze with gold plating on the surface. The plating thickness is ≥3μm and the contact resistance is ≤5mΩ. The distance between the top of the stylus (41) and the outer surface of the housing (1) is 0.3-0.8mm.

5. The magnetic tablet charger according to claim 1, characterized in that: The PCB board (3) integrates an overvoltage protection circuit, a temperature sensing module and an intelligent identification chip. The overvoltage protection circuit can withstand instantaneous voltage ≤40V, and the temperature sensing module automatically reduces the charging power when the temperature is ≥60℃.

6. The magnetic tablet charger according to claim 1, characterized in that: The housing (1) and the cover plate (2) are sealed by snap-fit, ultrasonic welding, or adhesive bonding.

7. The magnetic tablet charger according to claim 1, characterized in that: The power cord (6) is introduced into the housing (1) through the wire groove (14), and a stress relief ring is provided at the entrance of the wire groove (14).

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