A magnetic contact charging treasure for iPad

Abstract

The utility model provides a kind of iPad magnetic attraction contact point power bank, belong to power bank technical field.The power bank includes shell, battery in shell, mainboard, magnet group and the charging contact point being set on the surface of shell, to realize the fast power supply without data line.Magnet group layout corresponds with iPad internal magnet, avoid misplacement and lead to unstable charging.Magnet fixing frame is located between mainboard and battery, for fixing magnet group and mainboard, and form heat dissipation cavity, improve heat dissipation performance, guarantee the safety when fast charging.Magnetic attraction wireless charging module supports Qi protocol wireless charging, so that power bank has iPad contact point charging and general wireless charging function.The mainboard integrates Type-C charging port, key, indicator light, power detection circuit and the charging management circuit with overcharge, overdischarge, overcurrent, short circuit and overheat protection function.The utility model has the advantages of adsorption, efficient heat dissipation, multiple protection, one thing multiple use etc., applicable to iPad various use scenarios.

Description

Technical Field

[0001] This utility model relates to the field of mobile power technology, specifically to a magnetic contact power bank adapted to iPad, which is particularly suitable for scenarios that require simultaneous magnetic fixation, contact charging and wireless charging. Background Technology

[0002] As a mainstream tablet device, the iPad's battery life requirements for mobile use are increasing, driving the development of compatible external power banks. Currently, most power banks for iPads on the market are wired, requiring frequent plugging and unplugging of the data cable, which is inconvenient.

[0003] In recent years, some products have attempted to integrate magnetic attraction and contact charging functions to improve the user experience. However, these products generally suffer from several technical defects: First, the alignment precision between the magnetic structure and the charging contacts is insufficient, causing the contacts to easily misalign after attraction, resulting in unstable or interrupted charging. Public data shows that the alignment deviation of existing products often exceeds 1mm, leading to a poor user experience. Second, the circuit functionality has low integration, with chaotic logic for switching between contact charging, wireless charging, and self-charging modes, lacking a unified intelligent management core.

[0004] Therefore, there is an urgent need for a magnetic charging bank for iPads that can solve the above problems and achieve precise alignment and intelligent management. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide an iPad magnetic contact power bank to solve the problems of poor magnetic alignment accuracy, imperfect circuit management, and poor convenience performance of existing products.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A magnetic charging power bank for iPad includes a casing, a battery, and a motherboard housed within the casing. The core feature is that the motherboard has charging contacts for direct electrical contact with the charging port on the back of the iPad. This solution eliminates the traditional data cable connection method, directly supplying power through physical contacts, fundamentally improving the convenience and reliability of the connection. The casing also contains a magnet assembly, the layout of which precisely corresponds to the positions of the magnets inside the iPad. Utilizing the attraction between opposite poles of magnets and the pre-set matching layout, when the power bank is brought close to the back of the iPad, the magnetic force generates a strong guiding and positioning effect, achieving rapid and precise magnetic attachment and fixation between the power bank and the iPad. This ensures that the charging contacts on the motherboard automatically align with the port on the back of the iPad at the moment of attachment, effectively solving the charging instability problem caused by manual alignment deviations in traditional solutions.

[0008] Furthermore, a magnetic wireless charging module is integrated within the housing, and this module is electrically connected to the motherboard. This module typically includes a MagSafe magnet, a coil, and a magnetic shielding sheet. The coil generates an alternating magnetic field under the influence of the alternating current output from the motherboard. This magnetic field induces a current in the coil inside a wireless charging-enabled device, thus achieving charging. The MagSafe magnet enhances the attraction and positioning of the receiving device. This utility model power bank, while specifically designed for iPad contact charging, can also be used as a general-purpose magnetic wireless power bank, achieving "dual-purpose functionality" and greatly enhancing the product's practicality and value.

[0009] Furthermore, the housing includes a magnetic mounting bracket for securing the magnet assembly and the motherboard. The bracket is fixed between the motherboard and the battery with screws, creating a cavity between them. This bracket acts as a physical barrier, preventing heat generated by the motherboard during operation from being directly conducted to the temperature-sensitive battery. Secondly, the cavity utilizes the poor thermal conductivity of air, increasing thermal resistance and promoting air convection cooling. This significantly improves the heat dissipation performance inside the power bank, especially under fast charging conditions, effectively reducing the safety risks caused by high battery temperatures and extending the lifespan of electronic components.

[0010] Furthermore, the motherboard also integrates a charging port, buttons, and indicator lights. Simultaneously, the motherboard integrates a power detection circuit and a charging management circuit with overcharge, over-discharge, overcurrent, and short-circuit protection functions, and includes an NTC thermistor for temperature monitoring. The power detection circuit monitors the battery level in real time; the charging management circuit, acting as the "brain," intelligently manages the charging and discharging logic and mode switching (such as iPad contact charging, self-charging, and wireless charging); and multiple protection circuits automatically cut off the circuit under abnormal operating conditions (such as excessive current or temperature exceeding 60°C). The effect is that it achieves centralized, intelligent, and safe management of the charging and discharging process; users can intuitively understand the working status through buttons and indicator lights, making operation simple, safe, and reliable.

[0011] Compared with existing technologies, the iPad magnetic contact power bank provided by this utility model has the following advantages:

[0012] Precise alignment: The magnet assembly design, which matches the original iPad magnet layout, enables instant connection upon adsorption, ensuring stable contact between the charging contacts and the iPad interface and avoiding charging interruptions caused by misalignment.

[0013] Functional integration and intelligent management: The highly integrated motherboard manages multiple modes such as contact charging, wireless charging and self-charging in a unified manner. The logic is clear, and it has multiple protection functions such as overcharge, over-discharge, overcurrent, short circuit and overheating, making it safe and reliable.

[0014] Multi-functional: It combines iPad fast charging via touch points with universal magnetic wireless charging, making it more practical. Attached Figure Description

[0015] 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.

[0016] Figure 1 , 2 This is an overall schematic diagram of an embodiment of the present utility model;

[0017] Figure 3 An exploded view diagram provided for an embodiment of this utility model;

[0018] Figure 4 Another rear view provided for an embodiment of this utility model;

[0019] Figure 5 Another exploded view provided for an embodiment of this utility model;

[0020] Figure 6 A cross-sectional schematic diagram provided for an embodiment of this utility model;

[0021] Figure 7 , 8 Figures 9 and 10 are schematic diagrams of the circuit principle provided in the embodiments of this utility model.

[0022] The following are the labeling elements in the figure:

[0023] 1. Housing; 2. Battery; 3. Mainboard; 31. Charging contacts; 32. Charging port; 33. Button; 34. Indicator light; 4. Magnet assembly; 5. Magnet mounting bracket; 51. Screw; 6. Cover plate; 7. Magnetic wireless charging module; 71. MagSafe magnet; 72. Coil; 73. Magnetic shielding sheet; 74. Decorative cover; 75. Base plate; 8. Cavity.

[0024] 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

[0025] 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.

[0026] Combined with appendix Figure 1-9 This embodiment provides a detailed description of the iPad magnetic contact power bank, aiming to make the technical solution feasible and repeatable, while not limiting its protection scope. This embodiment is mainly designed for the iPad model, adapting to the magnetic layout and charging interface specifications on the back of the device. The core objective is to solve the pain points of existing magnetic power banks, such as large alignment deviations and limited functionality, ultimately achieving a comprehensive effect of precise magnetic alignment and multi-mode intelligent charging.

[0027] The casing 1 is made of aluminum alloy. Internally, it features a battery 2 slot, a motherboard 3 positioning post, and a magnet 4 mounting slot, precisely matching the dimensions of the built-in battery 2, motherboard 3, and magnet assembly 4. A Type-C interface hole is pre-drilled on one side of the casing 1 to accommodate the charging port 32, and a button hole corresponding to the button 33. Indicator light holes are evenly distributed, matching the arrangement of indicator lights 34. The battery 2, as the core of the power bank's battery life, is a soft-pack lithium polymer battery 2 with a capacity of 10000mAh and a nominal voltage of 3.7V, sufficient for long-term use. The battery 2 has a built-in battery protection board integrating overcharge protection, over-discharge protection, and overcurrent protection, effectively preventing safety risks caused by single-cell battery failure. To secure the battery 2 and aid in heat dissipation, thermally conductive adhesive is applied to the bottom of the battery 2, tightly bonding it to the battery slot in the casing 1. This not only conducts heat generated during battery 2 operation to the casing 1 for heat dissipation but also prevents the battery 2 from shifting during use.

[0028] like Figure 7 , 8As shown in Figure 9, the motherboard 3 is the control center for charging management, mode switching, and safety protection. It integrates multiple key components. Among them, the charging contacts 31 use gold-plated copper pillars, which perfectly match the contact layout on the back of the iPad to ensure stable current transmission. The charging port 32 uses a Type-C interface, supporting PD3.0 / QC4.0 fast charging protocols, taking into account both its own charging and external power supply fast charging needs. The button 33 is a touch button, which can realize charging mode switching and power on / off operation. The indicator light 34 is a red and green dual-color LED, used to indicate the battery level and working status, respectively. The motherboard 3 also integrates a main control chip, a charging management chip, and a power detection chip. The main control chip is responsible for coordinating core functions such as charging management, power detection, and mode switching. The charging management chip has built-in overcharge, over-discharge, overcurrent, and short circuit protection functions to provide safety assurance during the charging and discharging process. The power detection chip is connected to the main control chip through a communication interface to calculate and report the remaining power of battery 2 in real time. In addition, the motherboard 3 is equipped with an NTC thermistor, which is closely attached to the surface of the battery 2 to detect the temperature of the battery 2. When the temperature exceeds 60°C, overheat protection is triggered, and the battery automatically resumes operation when the temperature drops below 50°C. The circuit layout of the motherboard 3 follows the "signal isolation" principle. The circuits of the charging contacts 31 and the magnetic wireless charging module 7 are arranged in separate areas to avoid interference from the magnetic field on the charging signal of the contacts. The power circuit uses wide copper foil to reduce line impedance and reduce heat generation during current transmission.

[0029] The power supply and voltage regulation circuit provides a stable operating voltage for subsequent circuits, ensuring stable operation of the control logic. The power detection and battery management circuit collects the battery voltage through a voltage divider network, transmits it to the fuel gauge chip after signal conditioning, and calculates the remaining power in real time based on relevant battery parameters. Simultaneously, it uses an NTC thermistor to monitor the battery temperature in real time. The button and human-machine interface circuit uses pull-up resistors and capacitors for debouncing, ensuring the main control chip accurately recognizes button commands and improving the reliability of human-machine interaction. The authentication and fast charging protocol circuit implements protocol authentication for charging devices such as iPads, ensuring a high success rate for fast charging handshakes. The oscillator and clock circuit provides a stable clock signal to the main control chip, ensuring accurate internal timing logic and providing a fast response function. The circuit provides a time reference; the buck-boost converter and power management circuit boosts the battery voltage during fast charging output and bucks the input voltage during self-charging, while simultaneously implementing overcurrent protection through a current sampling resistor, resulting in high conversion efficiency; the Type-C interface and on / off control circuit integrate protective components, negotiates fast charging parameters through protocol communication, and controls power on / off based on load status to reduce no-load power consumption; the temperature detection and protection circuit uses an NTC thermistor to detect the motherboard and battery temperature, adjusting the output or stopping charging when the threshold is exceeded to prevent high temperatures from affecting battery life and safety; the LED indicator and auxiliary circuit controls the LED status through different level combinations to provide feedback on device operation, and the adapter insertion detection circuit enables automated control of charging upon connection. All circuit modules are organically integrated through PCB routing, the power circuit uses wide copper foil to reduce impedance, signal lines avoid high current paths to reduce interference, and grounding protection rings are installed around sensitive circuits to ensure stable operation even at high power output, with all performance indicators meeting design requirements. The core design of magnet group 4 lies in its precise matching with the magnets inside the iPad, ensuring that the charging contacts 31 can be automatically aligned when the magnet is attached. It uses N52 neodymium iron boron strong magnets to ensure stability when attached.

[0030] like Figure 3 , 5As shown, the magnetic mounting bracket 5 is located between the motherboard 3 and the battery 2, used to fix the magnet assembly 4 and the motherboard 3. Simultaneously, it blocks heat transfer and forms a heat dissipation cavity 8. Made of glass fiber reinforced PP material with low thermal conductivity, it effectively blocks the heat generated by the motherboard 3 during operation from being conducted to the temperature-sensitive battery 2. The magnetic mounting bracket 5 is fixed inside the housing 1 by screws 51. After installation, a cavity 8 is formed between the motherboard 3 and the battery 2. This cavity 8 utilizes air convection to significantly improve heat dissipation efficiency. During fast charging, the maximum temperature of the motherboard 3 and the battery 2 is significantly lower than in a design without a cavity, effectively reducing the safety risks caused by high temperatures. A cover plate 6 covers the surface of the housing 1. The magnetic wireless charging module 7 enables the power bank to function as both iPad contact charging and universal wireless charging, further expanding the product's practicality. The MagSafe magnet 71 in the module uses a ferrite magnetic ring, which can focus the magnetic field generated by the coil 72, reduce magnetic leakage, comply with the Qi standard, and avoid interference with surrounding devices. The coil 72 supports the Qi protocol, with a maximum output power of 15W, which can adapt to the needs of most devices that support wireless charging. The magnetic shielding sheet 73 is installed on the base plate 75, located between the coil 72 and the battery 2, which can prevent the magnetic field from spreading to the battery 2 and avoid the magnetic field from affecting the battery capacity. The decorative cover 74 is made of PC or glass, which not only protects the coil but also enhances the product's texture. It is fixed to the housing 1 by snaps or adhesive. The circuit of the magnetic wireless charging module 7 is connected to the motherboard 3 through terminals. The main control chip can detect the load status of the magnetic wireless charging module 7 in real time. When the iPad contact is not connected but a wireless charging device is attracted, it automatically switches to wireless charging mode without manual operation by the user. Of course, in some embodiments, iPad contact charging and wireless charging can work simultaneously. The cavity 8 formed by the magnet fixing bracket 5 separating the motherboard 3 and the battery 2 is a key structure for achieving efficient passive heat dissipation. There are no obstructing components inside the cavity 8, preventing heat buildup. The heat generated by the motherboard 3 during operation mainly comes from the charging management chip and the coil 72 of the magnetic wireless charging module 7. This heat is transferred to the housing 1 through air convection, and then dissipated to the external environment from the housing 1. During fast charging, the air temperature inside the cavity 8 is far below the safe temperature threshold of the battery 2, significantly improving the stability and lifespan of the product during long-term fast charging.

[0031] like Figure 7 , 8As shown in Figure 9, the power bank's workflow is uniformly coordinated by the main control chip, encompassing three core modes: self-charging, iPad contact discharge, and wireless discharge. When charging port 32 (Type-C interface) is connected to the charger, the charging management chip first detects the input voltage, negotiates compatible fast charging parameters with the charger via protocol, and then stably transmits power to battery 2. Simultaneously, the power detection chip monitors the remaining power of battery 2 in real time. When the power reaches 100%, the chip triggers a full-charge protection mechanism, automatically stopping charging to prevent overcharging of battery 2. When the power bank is attached to the iPad, the magnetic force of magnet group 4 guides the charging contact 31 to contact the iPad interface. The main control chip confirms the connection status by detecting the contact voltage, and then controls the charging management chip to output power, which is transmitted to the iPad through charging contact 31, achieving efficient fast charging. When no iPad is connected, but the magnetic wireless charging module 7 detects a device that supports wireless charging, the coil 72 generates an alternating magnetic field under the control of the motherboard 3. The magnetic shielding sheet 73 prevents the magnetic field from spreading to the battery 2, and the coil inside the receiving device induces a current, thus achieving wireless charging. The main control chip adjusts the coil current in real time to avoid overheating. Mode switching is automatically completed by the main control chip without manual operation by the user. In standby mode, if a charger is detected connected to the charging port 32 (Type-C interface), it switches to its own charging mode. If the battery 2 is fully charged during charging, it returns to standby. If no charger is connected but an iPad is detected, it switches to contact discharge mode. After the iPad is disconnected, it returns to standby. If neither a charger nor an iPad is connected, but the magnetic wireless charging module 7 detects a device, it switches to wireless discharge mode. After the device is disconnected, it returns to standby. During mode switching, the indicator light 34 provides synchronous status feedback. When charging itself, the red light flashes at a certain frequency, and the green light stays on when fully charged. When discharging via contact or wirelessly, the green light flashes at a certain frequency, and the green light stays on when there is no load, allowing users to intuitively understand the device's working status. This embodiment integrates five protections: overcharge, over-discharge, overcurrent, short circuit, and overheating, resulting in enhanced safety. Regarding mode switching, existing products often require manual switching with long response times; this embodiment automatically switches modes with shorter response times, making it more convenient to use. In terms of compatibility, existing products are mostly compatible with only a single model; this embodiment, by adjusting the size and magnet layout, can adapt to different models such as iPad Air and iPad Pro, offering greater versatility and reducing development costs.

[0032] This embodiment is designed to fully cover the diverse usage scenarios of the iPad. In mobile office scenarios, when business people use the iPad for document editing or video conferencing, the power bank can be attached to the back without the need for an additional data cable, keeping the desktop tidy. The high-power contact fast charging can quickly charge the iPad to meet the needs of continuous office work. At the same time, the built-in wireless charging module can also charge the mobile phone simultaneously, realizing "one charger for two devices" and avoiding the trouble of carrying multiple chargers.

[0033] To meet the needs of different users, this embodiment can be extended to various modifications. For different sized models such as iPad Air and iPad Pro, the size and layout of the casing, battery, and magnet assembly can be adjusted while keeping the core structure unchanged. Only the appearance and interface positions of different models need to be adapted, eliminating the need to redesign the overall solution and reducing R&D costs. For users seeking higher wireless charging power, the number of coil turns in the wireless charging module can be adjusted, and higher-specification MagSafe magnets and magnetic shielding sheets can be selected to increase wireless charging power and meet faster wireless charging needs. Furthermore, wireless charging area markings can be added to the cover surface, using laser engraving to indicate the effective wireless charging range, making it easier for users to quickly find the charging location and further optimizing the user experience. These modifications are all based on the core technical solution of this embodiment, do not deviate from the design concepts of precise magnetic attraction, efficient heat dissipation, and intelligent management, and all fall within the protection scope of this utility model.

[0034] 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.

[0035] 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 contact power bank for iPads, characterized in that: The device includes a housing (1), a battery (2) and a motherboard (3) disposed within the housing (1), and charging contacts (31) disposed on the surface of the housing (1). The motherboard (3) is electrically connected to the charging contacts (31) and the battery (2). The housing (1) also contains a magnet assembly (4), the layout of which corresponds to the magnets inside the iPad, for magnetically fixing the power bank to the back of the iPad.

2. The iPad magnetic contact power bank according to claim 1, characterized in that: The motherboard (3) integrates a power detection circuit and a charging management circuit to manage the charging and discharging process of the battery (2). The charging management circuit has overcharge protection, over-discharge protection, overcurrent protection and short circuit protection functions. The motherboard (3) is also equipped with an NTC thermistor that is electrically connected to the charging management circuit to detect the temperature of the battery (2). When the temperature exceeds a preset threshold, overheat protection is triggered.

3. The iPad magnetic contact power bank according to claim 1, characterized in that: The housing (1) is also provided with a magnetic wireless charging module (7), which is electrically connected to the motherboard (3).

4. The iPad magnetic contact power bank according to claim 1, characterized in that: The housing (1) is provided with a magnet fixing bracket (5), which is located between the main board (3) and the battery (2) and is used to fix the magnet assembly (4) and the main board (3).

5. The iPad magnetic contact power bank according to claim 2, characterized in that: The relative position of the magnet group (4) and the charging contact (31) is configured such that when the power bank is magnetically attached to the iPad, the charging contact (31) automatically aligns with and makes electrical contact with the charging port on the back of the iPad.

6. The iPad magnetic contact power bank according to claim 3, characterized in that: The magnetic wireless charging module (7) includes a MagSafe magnet (71), a base plate (75), a coil (72), and a magnetic shielding sheet (73).

7. The iPad magnetic contact power bank according to claim 4, characterized in that: The magnet holder (5) is fixed inside the housing (1) by screws (51).

8. The iPad magnetic contact power bank according to claim 1, characterized in that: The motherboard (3) also integrates a charging port (32), a button (33), and an indicator light (34).

9. The iPad magnetic contact power bank according to claim 8, characterized in that: The charging port (32) is a Type-C interface and supports fast charging protocols.

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