Charging device, control method and control device

By using a distance sensor to control the power supply to the electromagnetic charging element in the wireless charging device, the problem of electronic products being difficult to separate from the charging base after being attracted is solved, improving the user's ease of operation.

CN115208014BActive Publication Date: 2026-03-06VIVO MOBILE COMM CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-07-15
Publication Date
2026-03-06

AI Technical Summary

Technical Problem

In existing wireless charging solutions, electronic products are difficult to remove once they are magnetically attached to the charging base, and separation is challenging, making the process cumbersome for users.

Method used

A distance sensor is used to detect the distance between the housing and the supporting surface, and to control the power-on and power-off states of the electromagnetic suction components to facilitate the separation of electronic devices.

Benefits of technology

By automatically controlling the power on and off of the electromagnetic suction components, the process of separating electronic devices from charging devices is simplified, improving the user experience.

✦ Generated by Eureka AI based on patent content.

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Abstract

This application discloses a charging device, a control method, and a control apparatus. The charging device includes: a housing, a charging coil, an electromagnetic attractor, and a distance sensor. The charging coil is disposed in the housing and is used to charge an electronic device placed on the wireless charging dock. The electromagnetic attractor and the distance sensor are disposed in the housing, and the electromagnetic attractor is electrically connected to the distance sensor. The distance sensor is used to detect a first distance between the housing and a supporting surface, where the supporting surface is the placement surface of the housing. When the first distance is less than a preset value, the electromagnetic attractor is energized to attract the electronic device placed on the wireless charging dock. When the first distance is greater than or equal to the preset value, the electromagnetic attractor is de-energized to release the electronic device placed on the wireless charging dock.
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Description

Technical Field

[0001] This application belongs to the field of charging technology, specifically relating to a charging device, a control method, and a control device. Background Technology

[0002] With the development of technology, electronic products have become increasingly widespread. These products require frequent charging, primarily via wired and wireless charging. Wireless charging is more convenient and is gradually gaining popularity. Magnetic chargers use magnetic attachments on their charging bases to hold electronic products securely in place for charging.

[0003] Most current wireless charging solutions use magnetic attraction to align electronic products with the charging base to ensure charging efficiency. However, once the electronic products are attached to the charging base, they are inconvenient to remove and difficult to separate, requiring both hands to separate them. This is cumbersome for users and detrimental to the user experience. Summary of the Invention

[0004] This application aims to provide a solution to at least one of the problems of electronic products being inconvenient to remove and difficult to separate after being attached to a magnetic charger.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] In a first aspect, embodiments of this application provide a charging device, which includes:

[0007] Housing, charging coil, electromagnetic attraction element, and distance sensor;

[0008] The charging coil is disposed on the housing and is used to charge electronic devices placed on the charging device;

[0009] The electromagnetic suction component and the distance sensor are disposed on the housing. The electromagnetic suction component is electrically connected to the distance sensor. The distance sensor is used to detect a first distance between the housing and the bearing surface, and the bearing surface is the placement surface of the housing.

[0010] When the first distance is less than a preset value, the electromagnetic attractor is energized to attract electronic devices placed on the charging device; when the first distance is greater than or equal to the preset value, the electromagnetic attractor is de-energized to release electronic devices placed on the charging device.

[0011] Secondly, embodiments of this application propose a charging device control method, applied to the charging device as described in the first aspect, the method comprising:

[0012] The first distance between the housing and the bearing surface is obtained by the distance sensor;

[0013] When the first distance is less than a preset value, power is supplied to the electromagnetic suction component;

[0014] When the first distance is greater than or equal to a preset value, the power supply to the electromagnetic suction component is cut off.

[0015] Thirdly, embodiments of this application provide a charging device control device, the control device comprising:

[0016] The acquisition module is used to acquire the first distance between the housing and the bearing surface through the distance sensor.

[0017] The control module is used to supply power to the electromagnetic suction component when the first distance is less than a preset value; and is also used to cut off the power supply to the electromagnetic suction component when the first distance is greater than or equal to the preset value.

[0018] In the embodiments of this application, during the process of charging the electronic device through the charging device, picking up the electronic device will cause the charging device to rise along with the electronic device. The distance sensor detects the first distance between the housing and the supporting surface. When the first distance is greater than or equal to a preset value, the electromagnetic suction component is in a de-energized state to release the electronic device placed on the charging device, making it easier to separate the electronic device from the charging device and reducing the difficulty of separation.

[0019] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0021] Figure 1 This is one of the structural schematic diagrams of a charging device according to an embodiment of this application;

[0022] Figure 2 This is a second schematic diagram of the structure of the charging device according to an embodiment of this application;

[0023] Figure 3 This is a flowchart of a control method according to an embodiment of this application;

[0024] Figure 4 This is a schematic diagram of the structure of the charging device control device according to an embodiment of this application;

[0025] Figure 5 This is a schematic diagram of the hardware structure of an electronic device according to an embodiment of this application.

[0026] Figure label:

[0027] 1. Electromagnetic suction component; 2. Distance sensor; 3. Housing; 4. Delay switch; 5. Push button switch; 6. Light-transmitting component; 7. Anti-slip mat. Detailed Implementation

[0028] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0029] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0030] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0031] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] The following is combined with Figures 1-2 A charging device according to an embodiment of this application is described.

[0033] like Figures 1-2 As shown, according to some embodiments of this application, the charging device includes:

[0034] 3. Housing, charging coil, electromagnetic suction component 1, and distance sensor 2;

[0035] The charging coil is disposed on the housing 3 and is used to charge electronic devices placed on the charging device;

[0036] The electromagnetic suction component 1 and the distance sensor 2 are disposed on the housing 3. The electromagnetic suction component 1 is electrically connected to the distance sensor 2. The distance sensor 2 is used to detect a first distance between the housing 3 and the bearing surface, and the bearing surface is the placement surface of the housing 3.

[0037] When the first distance is less than a preset value, the electromagnetic suction element 1 is energized to attract electronic devices placed on the charging device; when the first distance is greater than or equal to the preset value, the electromagnetic suction element 1 is de-energized to release electronic devices placed on the charging device.

[0038] Understandably, when an electronic device is placed on a charging device for charging, the interaction between the magnetic components on the charging device and the magnetic components in the electronic device means that when the user needs to pick up the electronic device, the charging device will be lifted along with the electronic device, making it difficult to separate the electronic device and the charging device. In this embodiment, when the charging device is lifted along with the electronic device, the charging device leaves the supporting surface. This supporting surface is the screen where the charging device is placed, for example, the charging device can be placed on a table. When the charging device is lifted off the table, a distance sensor on the charging device detects the distance between the charging device and the table. When this distance is greater than a preset threshold, it indicates that the charging device and the electronic device have been picked up together. At this time, the control module inside the charging device is triggered to de-energize the magnetic coil in the charging device. Since the magnetic coil loses its magnetic attraction, the magnetic force on the electronic device disappears, so the electronic device can be separated from the charging device, and the charging device can fall back onto the table. In this way, the user does not need to manually pry the electronic device and the charging device apart, improving the user experience.

[0039] In the embodiments of this application, during the charging process of the electronic device, picking up the electronic device will cause the charging device to rise along with the electronic device. The distance sensor 2 detects a first distance between the housing 3 and the supporting surface. When the first distance is greater than or equal to a preset value, the electromagnetic suction member 1 is de-energized to release the electronic device placed on the charging device, making it easier to separate the electronic device from the charging device and reducing the difficulty of separation.

[0040] When the first distance is less than a preset value, the electromagnetic chuck 1 remains energized, and the electronic device and the charging device are magnetically attracted by the electromagnetic chuck 1, preventing the charging device from detaching from the electronic device. This avoids the problem of the charging device and the supporting surface being raised when the user accidentally touches or uses the electronic device, and prevents the electronic device from detaching from the charging device when charging is required, thus ensuring that the charging device can maintain the charging state of the electronic device.

[0041] The preset value is the distance between the charging device and the surface on which the charging device is placed, as sensed by the distance sensor 2. When the user picks up the electronic device, if the distance sensor 2 senses a first distance between the charging device and the surface that is greater than or equal to a preset threshold, it controls the power supply to the electromagnetic chuck 1 to allow the electronic device to detach from the charging device. After detaching from the electronic device, the charging device falls onto the surface. The preset value can be set according to user needs.

[0042] According to one embodiment of this application, such as Figure 3 As shown, this application provides a charging device control method, applied to the charging device as described in the embodiments of this application, the method comprising:

[0043] Step 1100: Obtain the first distance between the housing 3 and the bearing surface using the distance sensor 2;

[0044] Step 1200: When the first distance is less than a preset value, power is supplied to the electromagnetic suction component 1;

[0045] Step 1300: When the first distance is greater than or equal to a preset value, cut off the power supply to the electromagnetic suction component 1.

[0046] In the embodiments of this application, during the charging process of the electronic device, picking up the electronic device will cause the charging device to rise along with the electronic device. The distance sensor 2 detects this and obtains a first distance between the housing 3 and the supporting surface. When the first distance is greater than or equal to a preset value, the electromagnetic suction member 1 is de-energized to release the electronic device placed on the charging device, making it easier to separate the electronic device from the charging device and reducing the difficulty of separation.

[0047] Optionally, the process of acquiring the first distance can be performed at preset time intervals or continuously. For example, the data of the first distance can be continuously acquired, and when the first distance remains below a preset threshold, the power supply to the magnetic coil 1 is maintained so that the charging device can maintain its attraction to the electronic device.

[0048] In one embodiment, such as Figures 1-2 As shown, the charging device also includes a delay switch 4, and the electromagnetic suction component 1 is electrically connected to the distance sensor 2 through the delay switch 4.

[0049] The delay switch 4 can delay the supply of power to the electromagnetic suction component 1 to avoid the problem that the distance between the charging device and the bearing surface is less than the preset value after the power is cut off, and the electromagnetic suction component 1 is attracted to the electronic device again after being powered on.

[0050] For example, when a user picks up the electronic device and the initial distance exceeds a preset value, the electromagnetic suction component 1 is de-energized, and the charging device detaches from the electronic device. After the charging device detaches from the electronic device and falls, the distance sensor 2 detects a distance less than the preset value between the charging device and the supporting surface. If the electromagnetic suction component 1 is energized at this time, the charging device and the electronic device can easily re-attach and cannot be effectively separated.

[0051] With the delay switch 4 in place, after the electromagnetic suction component 1 is de-energized and the charging device detaches from the electronic device when the first distance is greater than a preset value, the distance sensor 2 detects the distance between the housing and the supporting surface. If the detected distance is less than the preset value, power is supplied to the electromagnetic suction component 1 again after a preset time period via the delay switch 4 to generate magnetic attraction. This prevents the charging device from failing to effectively separate from the electronic device.

[0052] In one embodiment, the charging device further includes a delay switch 4, and the electromagnetic suction element 1 is electrically connected to the distance sensor 2 through the delay switch 4;

[0053] After the power supply to the electromagnetic suction element 1 is cut off, the method further includes:

[0054] Step 1400: Obtain the second distance between the housing 3 and the bearing surface;

[0055] Step 1500: When the second distance is less than a preset value, power is supplied to the electromagnetic suction component 1 through the delay switch 4 after a preset time period.

[0056] In this embodiment, when the second distance is less than or equal to a preset threshold, the delay switch 4 is closed to supply power to the magnetic coil 1 after a preset time period. For example, the delay switch 4 is located on the line supplying power to the magnetic coil 1, and the magnetic coil 1 is powered by closing the delay switch 4. The energized magnetic coil 1 forms a magnetic field, which can attract electronic devices. When the electronic device is placed on the charging device again, it can attract the device for charging.

[0057] In one embodiment, the charging device further includes a push-button switch 5, which is disposed in the housing 3 and electrically connected to the distance sensor 2. The push-button switch 5 is used to control the opening and closing of the distance sensor 2.

[0058] In this embodiment, the push-button switch 5 can be used to control the opening and closing of the distance sensor 2. The operation of the push-button switch 5 controls whether the distance sensor 2 is working. When the distance sensor 2 needs to be used, it is turned on by the push-button switch 5. When the distance sensor 2 is not needed, it is turned off by the push-button switch 5.

[0059] For example, after the user removes the electronic device, the charging device falls onto the table. By turning off the distance sensor 2 via button switch 5, when the charging device needs to be moved again, the problem of the electronic device falling off is avoided because the electromagnetic suction component 1 will be de-energized and demagnetized when the distance detected by the distance sensor 2 exceeds a preset value.

[0060] In one embodiment, the charging device further includes a push-button switch 5, which is disposed in the housing 3 and electrically connected to the distance sensor 2. The push-button switch 5 is used to control the opening and closing of the distance sensor 2.

[0061] Before obtaining the first distance between the housing 3 and the bearing surface through the distance sensor 2, the method further includes:

[0062] Step 1000: Turn on the distance sensor 2 using the button switch 5.

[0063] In one embodiment, the housing 3 has a first surface and a second surface, which are two opposite surfaces of the housing 3. The electromagnetic suction element 1 is located on the side of the first surface, and the distance sensor 2 is located on the side of the second surface.

[0064] In this embodiment, the distance sensor 2 is used to detect the distance between the housing 3 and the supporting surface. During the use of the charging device, the second surface is positioned facing the supporting surface, enabling the distance sensor 2 to detect the distance between the housing 3 and the supporting surface, thereby obtaining the distance between the housing 3 and the supporting surface.

[0065] The first surface faces the side opposite to the bearing surface, and the electronic device is used to place on the first surface so that the electromagnetic suction member 1 located on one side of the first surface can charge the electronic device placed on the first surface.

[0066] In one embodiment, such as Figure 1 , Figure 2 As shown, the charging device also includes an anti-slip pad 7, which is disposed on the second surface.

[0067] In this embodiment, the second surface is placed with one side facing the bearing surface, and the anti-slip pad 7 can form an anti-slip effect between the housing 3 and the bearing surface to prevent accidental contact with the charging device and causing slippage.

[0068] In one embodiment, such as Figure 1 , Figure 2 As shown, the second surface is provided with a light-transmitting element 6, the distance sensor 2 is positioned opposite the light-transmitting element 6, and the anti-slip pad 7 avoids the light-transmitting element 6.

[0069] In this embodiment, the light-transmitting element 6 is used to protect the distance sensor 2, allowing the distance sensor 2 to detect distance through the light-transmitting element 6. For example, an opening is formed on the second surface, and the light-transmitting element 6 is disposed within the opening, with the distance sensor 2 located inside the opening. The light-transmitting element 6 can be made of a light-transmitting material such as transparent glass.

[0070] According to one embodiment of this application, a charging device control device is provided, such as... Figure 4 As shown, the control device includes:

[0071] The acquisition module 201 is used to acquire the first distance between the housing 3 and the bearing surface through the distance sensor 2.

[0072] The control module 202 is used to supply power to the electromagnetic suction component 1 when the first distance is less than a preset value; and is also used to cut off the power supply to the electromagnetic suction component 1 when the first distance is greater than or equal to the preset value.

[0073] The charging device control device in this application embodiment can be an electronic device or a component within an electronic device, such as an integrated circuit or a chip. The electronic device can be a terminal or other devices besides a terminal. For example, the electronic device can be a mobile phone, tablet computer, laptop computer, PDA, in-vehicle electronic device, mobile internet device (MID), augmented reality (AR) / virtual reality (VR) device, robot, wearable device, ultra-mobile personal computer (UMPC), netbook, or personal digital assistant (PDA), etc. It can also be a server, network attached storage (NAS), personal computer (PC), television (TV), ATM, or self-service machine, etc. This application embodiment does not specifically limit the scope of the device.

[0074] The charging device control device in this application embodiment can be a device with an operating system. This operating system can be Android, iOS, or other possible operating systems; this application embodiment does not specifically limit it.

[0075] This application also provides an electronic device, which includes a processor and a memory. The memory stores programs or instructions that can run on the processor. When the program or instructions are executed by the processor, they implement the charging device control method described above.

[0076] Figure 5 A schematic diagram of the hardware structure of an electronic device to implement an embodiment of this application.

[0077] The electronic device 600 includes, but is not limited to: a radio frequency unit 601, a network module 602, an audio output unit 603, an input unit 604, a sensor 605, a display unit 606, a user input unit 607, an interface unit 608, a memory 609, and a processor 610.

[0078] Those skilled in the art will understand that the electronic device 600 may also include a power supply (such as a battery) for supplying power to various components. The power supply may be logically connected to the processor 610 through a power management system, thereby enabling functions such as managing charging, discharging, and power consumption through the power management system. Figure 5 The electronic device structure shown does not constitute a limitation on the electronic device. The electronic device may include more or fewer components than shown, or combine certain components, or have different component arrangements, which will not be elaborated here.

[0079] It should be understood that, in this embodiment, the input unit 604 may include a graphics processing unit (GPU) 6041 and a microphone 6042. The GPU 6041 processes image data of still images or videos obtained by an image capture device (such as a camera) in video capture mode or image capture mode. The display unit 606 may include a display panel 6061, which may be configured in the form of a liquid crystal display, an organic light-emitting diode, or the like. The user input unit 607 includes at least one of a touch panel 6071 and other input devices 6072. The touch panel 6071 is also called a touch screen. The touch panel 6071 may include two parts: a touch detection device and a touch controller. Other input devices 6072 may include, but are not limited to, a physical keyboard, function keys (such as volume control buttons, power buttons, etc.), a trackball, a mouse, and a joystick, which will not be described in detail here.

[0080] The memory 609 can be used to store software programs and various data. The memory 609 may primarily include a first storage area for storing programs or instructions and a second storage area for storing data. The first storage area may store the operating system, application programs or instructions required for at least one function (such as sound playback, image playback, etc.). Furthermore, the memory 609 may include volatile memory or non-volatile memory, or both. The non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory can be random access memory (RAM), static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct memory bus RAM (DRRAM). The memory 609 in this embodiment includes, but is not limited to, these and any other suitable types of memory.

[0081] Processor 610 may include one or more processing units; optionally, processor 610 integrates an application processor and a modem processor, wherein the application processor mainly handles operations involving the operating system, user interface, and applications, and the modem processor mainly handles wireless communication signals, such as a baseband processor. It is understood that the aforementioned modem processor may also not be integrated into processor 610.

[0082] This application also provides a readable storage medium storing a program or instructions, which, when executed by a processor, implement the charging device control method described above.

[0083] The processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0084] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the various processes of the above-described charging device control method embodiment and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0085] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0086] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A charging device, characterized by, The charging device comprises a shell, a charging coil, an electromagnetic suction element and a distance sensor. The charging coil is arranged in the shell and used for charging an electronic device placed on the charging device. The electromagnetic suction element and the distance sensor are arranged in the shell, the electromagnetic suction element is electrically connected with the distance sensor, and the distance sensor is used for detecting a first distance between the shell and a bearing surface which is a placement surface of the shell. When the first distance is less than a preset value, the electromagnetic suction element is in a power-on state to adsorb the electronic device placed on the charging device; and when the first distance is greater than or equal to the preset value, the electromagnetic suction element is in a power-off state to release the electronic device placed on the charging device. The charging device further comprises a time delay switch, and the electromagnetic suction element is electrically connected with the distance sensor through the time delay switch.

2. The charging device of claim 1, wherein, The charging device further comprises a key switch arranged in the shell, the key switch is electrically connected with the distance sensor, and the key switch is used for controlling the opening and closing of the distance sensor.

3. The charging device of claim 1, wherein, The shell has a first surface and a second surface which are two opposite surfaces of the shell, the electromagnetic suction element is located on one side of the first surface, and the distance sensor is located on one side of the second surface.

4. The charging device of claim 1, wherein, The charging device further comprises an anti-skid pad arranged on the second surface.

5. The charging device of claim 4, wherein, The second surface is provided with a light-transmitting element, the distance sensor is arranged opposite to the light-transmitting element, and the anti-skid pad avoids the light-transmitting element.

6. The charging device of claim 5, wherein, The method comprises:

7. A charging device control method applied to the charging device according to any one of claims 1 to 6, characterized by, acquiring a first distance between a shell and a bearing surface through a distance sensor; when the first distance is less than a preset value, supplying power to the electromagnetic suction element; when the first distance is greater than or equal to the preset value, cutting off the power supply of the electromagnetic suction element. The charging device further comprises a time delay switch, and the electromagnetic suction element is electrically connected with the distance sensor through the time delay switch.

8. The method of claim 7, wherein, After the power supply of the electromagnetic suction element is cut off, the method further comprises: acquiring a second distance between the shell and the bearing surface; when the second distance is less than the preset value, supplying power to the electromagnetic suction element through the time delay switch after a preset time period. The charging device further comprises a key switch arranged in the shell, the key switch is electrically connected with the distance sensor, and the key switch is used for controlling the opening and closing of the distance sensor.

9. The method of claim 7, wherein, Before the first distance between the shell and the bearing surface is acquired through the distance sensor, the method further comprises: turning on the distance sensor through the key switch. The control device comprises:

10. A charging device control device applied to the charging device according to any one of claims 1 to 6, characterized by, an acquisition module configured to acquire a first distance between a shell and a bearing surface through a distance sensor; a control module configured to supply power to the electromagnetic suction element when the first distance is less than a preset value, and to cut off the power supply of the electromagnetic suction element when the first distance is greater than or equal to the preset value. ​

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