Desktop wireless charging system

Abstract

The utility model relates to the technical field of wireless charging, in particular to a desktop wireless charging system, which comprises a charging module comprising a central controller and a charging part electrically connected with the central controller; the identification module is arranged on the desktop and used for shooting an image of the mobile phone on the desktop and transmitting the image to the central controller, and the central controller is used for calculating a positioning coordinate of the mobile phone on the desktop and sending an instruction to the moving assembly; the moving assembly is arranged on the back side of the table top, and the charging part is arranged on the moving assembly in a sliding mode. The beneficial effects of the utility model are that through the arrangement of the charging module and the identification module, mobile phones and mobile charging equipment placed on a desktop can be identified, any placed mobile phones can be charged, and the detection module is also arranged to detect the voltage, current and magnetic field change values when the mobile phones are charged, thereby playing a role in protecting the mobile phone batteries.

Description

TECHNICAL FIELD

[0001] The utility model relates to wireless charging technical field, especially a desktop wireless charging system. BACKGROUND

[0002] Wireless charging is a special charging mode, and the biggest difference with traditional charger is that it does not need data line. Its working principle is similar to transformer, and charges by using electromagnetic induction principle. A coil is installed at each of the sending end and receiving end, the sending end sends electromagnetic signal under the action of current, and the coil of the receiving end converts electromagnetic signal into current after receiving the signal, thereby realizing charging.

[0003] Unlike traditional wired charging mode, wireless charging does not need to distinguish interface, and is very simple to use: only need to place the mobile phone on the charger to start charging. But the use scene of wireless charging is fixed, such as table or counter, and the position on the table or counter is fixed, and the mobile phone must be placed at the corresponding position during charging, so as to charge. At the same time, when metal foreign matter enters the charging area and the mobile phone is charging, the metal will generate high heat due to eddy current effect, thereby causing damage to the mobile phone and charging equipment. SUMMARY

[0004] This section aims to outline some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the utility model name to avoid obscuring the purpose of this section, the abstract of the specification and the utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0005] In view of the above or the problem that the mobile phone placed at any position on the desktop cannot be charged in the prior art, the utility model is proposed.

[0006] Therefore, the purpose of the utility model is to provide a desktop wireless charging system.

[0007] To solve the above technical problems, the utility model provides the following technical scheme: a desktop wireless charging system, which comprises a charging module, a central controller and a charging part, the central controller is electrically connected with the charging part, an identification module, the identification module is arranged on the desktop and shoots the image of the mobile phone on the desktop, and transmits to the central controller, the central controller calculates the positioning coordinates of the mobile phone on the desktop, and sends instructions to the moving assembly, the moving assembly is arranged on the back side of the desktop, and the charging part is slidably arranged on the moving assembly.

[0008] As a preferred scheme of the desktop wireless charging system of the utility model, the pin P4 and P5 of the identification module are connected with the pin PB10 and PB11 of the central controller.

[0009] As a preferred scheme of the desktop wireless charging system of the utility model, wherein: the mobile assembly includes the slide platform set in the back side of the desktop and slidably connected with the charging part, the first driving part and the second driving part connected with the horizontal shaft and the vertical shaft of the slide platform respectively.

[0010] As a preferred scheme of the desktop wireless charging system of the utility model, wherein: the first driving part includes the first driver and the first driving motor, the first driving motor and the first driver are electrically connected, the pins CP-, DIR-, EN- of the first driver are connected with the pins PA3, PA4, PA5 of the central controller respectively; the second driving part includes the second driver and the second driving motor, the second driving motor and the second driver are electrically connected, the pins CP-, DIR-, EN- of the second driver are connected with the pins PA7, PB0, PB1 of the central controller respectively.

[0011] As a preferred scheme of the desktop wireless charging system of the utility model, wherein: the central controller and the charging part are provided with the switch part, the switch part includes the transistor Q1 and the relay D4, the collector of the transistor Q1 is connected with the coil pin 5 of the relay D4, the base of the transistor Q1 is connected with the pin PA6 of the central controller, and the emitter of the transistor Q1 is grounded.

[0012] As a preferred scheme of the desktop wireless charging system of the utility model, wherein: the relay D4 includes the common end, the NO end and the NC end, when there is no voltage between the two ends of the coil, the common end is connected to the NC end, when there is voltage between the two ends of the coil, the common end is connected to the NO end; the diode D3 is connected between the coil pin 1 and the coil pin 5 of the relay D4.

[0013] As a preferred scheme of the desktop wireless charging system of the utility model, wherein: the central controller is further connected with the detection module, the detection module includes the voltage detection circuit, the current detection circuit and the magnetic field detection circuit, the detection module collects the voltage, current and magnetic field signals of the coil of the charging part and transmits to the central controller.

[0014] As a preferred scheme of the desktop wireless charging system of the utility model, wherein: the input ends of the voltage detection circuit and the current detection circuit are connected with the coil of the charging part.

[0015] As a preferred scheme of the desktop wireless charging system of the utility model, wherein: the voltage detection circuit and the current detection circuit are connected with the pins CH0, CH1 of the analog-digital converter respectively;

[0016] The pins DIO, CLK of the analog-digital converter are connected with the pins PA0, PA1 of the central controller.

[0017] As a preferred scheme of the desktop wireless charging system, the pin SPI_SCK, SPI_MISO and SPI_MOSI of the magnetic field detection circuit are connected with PB3, PB4 and PB5 of the central controller respectively.

[0018] The utility model discloses the beneficial effect has: the utility model discloses through setting charging module and identification module, can identify the cell phone placed on the desktop, mobile charging equipment, charges the cell phone of arbitrary placement, still be provided with detection module, detects the voltage, current, magnetic field change value of cell phone charging, plays the protection function to cell phone battery. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be to the drawing needed to be used in the embodiment description briefly introduced, obviously, the drawing in the following description only some embodiments of the utility model, for the ordinary skilled person in the art, under the premise of not paying the creative labor, still can obtain other drawings according to these drawings. Wherein:

[0020] Figure 1 It is the desktop schematic diagram of the utility model.

[0021] Figure 2 It is the structure schematic diagram of the desktop back side in the utility model.

[0022] Figure 3 It is the hardware block diagram of the utility model.

[0023] Figure 4 It is the positioning cell phone flow chart in the utility model.

[0024] Figure 5 It is the circuit diagram of central controller in the utility model.

[0025] Figure 6 It is the circuit diagram of first drive 302 and second drive 303 in the utility model.

[0026] Figure 7 It is the circuit diagram of identification module in the utility model.

[0027] Figure 8 It is the circuit diagram of switch piece in the utility model.

[0028] Figure 9 It is the voltage detection circuit diagram in the utility model.

[0029] Figure 10 It is the current detection circuit diagram in the utility model.

[0030] Figure 11 It is the magnetic field detection circuit diagram in the utility model. DETAILED DESCRIPTION

[0031] In order to make the above objectives, characteristics and advantages of the present application more apparent, a detailed description of the specific embodiments of the present application will be given below with reference to the accompanying drawings.

[0032] In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the connotation of the present application, therefore the present application is not limited by the specific embodiments disclosed below.

[0033] Secondly, the "one embodiment" or "embodiment" referred to herein means that a specific feature, structure or characteristic can be included in at least one implementation of the present application. "In one embodiment" appearing in different places in the specification does not mean the same embodiment, nor is it an embodiment that is independent of or mutually exclusive of other embodiments.

[0034] Embodiment 1

[0035] Reference Figures 1-4 For the first embodiment of the present application, the embodiment provides a desktop wireless charging system, which can realize the effect that a mobile phone placed at any position on the desktop can be wirelessly charged, which comprises a charging module 100 and an identification module 200. The identification module 200 can identify the mobile phone placed on the desktop and send the position information of the mobile phone to the charging module 100, and the charging module 100 moves to the position of the mobile phone to charge the mobile phone.

[0036] Specifically, the charging module 100 comprises a central controller 101 and a charging part 102, and the central controller 101 is electrically connected with the charging part 102. The central controller 101 is arranged on the shell of the charging part 102, and the central controller 101 is used to control the start and stop of the charging part 102.

[0037] Further, the identification module 200 is arranged on the desktop and takes an image of the mobile phone on the desktop, and transmits it to the central controller 101. The central controller 101 calculates the positioning coordinates of the mobile phone on the desktop and sends instructions to the moving assembly 300. The moving assembly 300 is arranged on the back side of the desktop, and the charging part 102 is slidingly arranged on the moving assembly 300. The identification module 202 is electrically connected with the central controller 101, the identification module 200 identifies the mobile phone placed on the desktop and sends the identified position of the mobile phone to the central controller 101, and the central controller 101 starts the moving assembly 300. The moving assembly 300 moves the charging part 102 to the bottom end of the mobile phone to directly charge the mobile phone.

[0038] In use, the mobile phone is placed on the desktop, the recognition module 200 recognizes the mobile phone on the desktop and the position of the mobile phone, and transmits the collected information to the central controller 101, the central controller 101 processes and analyzes the received information, and sends instructions to the moving assembly 300, the moving assembly 300 drives the charging part 102 to move to the lower side of the mobile phone, and the central controller 101 controls the charging part 102 to start and charge the mobile phone.

[0039] In summary, by arranging the charging module 100 and the recognition module 200, the charging part 102 can be moved to any position on the back side of the desktop to charge any placed mobile phone.

[0040] Embodiment 2

[0041] Reference Figures 1-8 , the second embodiment of the utility model, different from the last embodiment is that, this embodiment provides further optimization of desktop wireless charging system, solves how to realize the problem that any position on the desktop can be charged, it includes the pin P4, P5 of recognition module 200 and the pin PB10, PB11 of central controller 101 are connected. In the utility model, the recognition module 200 is a camera, is arranged on the side of the desktop through a support, directly shoots the image of the desktop, transmits the image shot to the central controller 101, and the central controller 101 receives the image, processes and analyzes the image, recognizes the mobile phone in the picture, obtains the position information of the mobile phone. The central controller 101 pre-processes the collected image, first carries out noise reduction and sharpening, and then carries out color detection on the image. Since there is obvious difference between the color of the mobile phone screen and the desktop, the mobile phone can be obviously detected. The design uses RGB model detection method to compare the detected pixel points with the RGB model to obtain the color of the mobile phone. Then, the Canny edge detection method is used to extract the edge information in the image, and the feature points of the mobile phone, such as corner points and straight lines, are further extracted to recognize the mobile phone in the image. Finally, the position and direction of the mobile phone in the image are determined through geometric calculation, and the positioning result is corrected and verified to ensure the accuracy of the mobile phone positioning.

[0042] Specifically, the moving assembly 300 comprises a sliding table 301 arranged on the back side of the desktop and slidably connected with the charging member 102, a first driving member 302 connected with the horizontal shaft and the vertical shaft of the sliding table 301 respectively, and a second driving member 303. The central controller 101 transmits control instructions to the moving assembly 300, and the moving assembly 300 receives the instructions and starts the first driving member 302 and the second driving member 303 to drive the charging member 102 to move on the sliding table 301 and to the lower side of the mobile phone to charge the mobile phone. In the utility model, the sliding table 301 is arranged on the back side of the desktop, the sliding table 301 comprises two groups of horizontal shafts arranged on the two sides of the back side of the desktop, a vertical shaft slidably arranged between the two groups of horizontal shafts, the output end of the first driving member 302 is connected to one end of any one group of horizontal shafts, a transmission assembly is arranged between the two groups of horizontal shafts and can drive the two groups of horizontal shafts to rotate simultaneously, the end portion of the vertical shaft is slidably connected to the two groups of horizontal shafts through a sliding block, the end portion of the vertical shaft is rotatably connected to the sliding block, the end portion of the vertical shaft is rotatably connected to the output end of the second driving member 303, and the shell of the charging member 102 is slidably connected to the vertical shaft through a sliding block. Therefore, after the moving assembly receives the instructions, the first driving member 302 is started to drive the horizontal shaft to rotate, the vertical shaft and the charging member 102 are driven to move horizontally as a whole, and after moving to the specified position, the second driving member 303 is driven to rotate the vertical shaft, so that the charging member 303 moves vertically as a whole and moves to the lower side of the mobile phone.

[0043] Further, the first driving member 302 comprises a first driving motor 302b and a first driving device 302a, the first driving motor 302b and the first driving device 302a are electrically connected, the pins CP-, DIR-, EN- of the first driving device 302a are connected with the pins PA3, PA4, PA5 of the central controller 101 respectively; the second driving member 303 comprises a second driving motor 303b and a second driving device 303a, the second driving motor 303b and the second driving device 303a are electrically connected, the pins CP-, DIR-, EN- of the second driving device 303a are connected with the pins PA7, PB0, PB1 of the central controller 101 respectively. The first driving device 302a and the second driving device 303a are connected with the central controller 101, the first driving motor 302b and the second driving motor 303b are controlled to start and stop and to move forward or reversely by the central controller 101 through the first driving device 302a and the second driving device 303a, so as to control the position movement of the charging member 102.

[0044] Further, the switch part 103 is arranged between the central controller 101 and the charging part 102, the switch part 103 comprises a triode Q1 and a relay D4, the collector of the triode Q1 is connected with the coil pin 5 of the relay D4, the base of the triode Q1 is connected with the pin PA6 of the central controller 101, and the emitter of the triode Q1 is grounded. In the utility model, the base of the triode Q1 is connected with the resistance R3, the emitter of the triode Q1 is grounded, the resistance R4 is further connected in series between the base and the emitter of the triode Q1, and the collector of the triode Q1 is connected with the pin 5 of the relay D4. When the base of the triode Q1 inputs high level, the triode Q1 is turned on, the collector of the triode Q1 is grounded, the coil of the relay D4 has voltage at both ends, the coil generates a magnetic field, and the common end of the relay D4 is attracted to the NO end. Conversely, when the base of the triode Q1 inputs low level, the triode Q1 cannot be turned on, the coil of the relay D4 has no voltage at both ends, the common end of the relay D4 is not subjected to magnetic force, and the common end of the relay D4 is bounced back to the NC end. The diode D3 is connected in series between the pin 5 and the pin 1 of the relay D4, and the diode D3 can play a role of freewheeling. Because the coil of the relay D4 is an inductive element, a great reverse voltage is generated in the moment when the relay D4 is turned off, and the diode D3 is arranged to form a loop and protect other elements in the circuit.

[0045] Preferably, the relay D4 comprises a common end, an NO end and an NC end, when the coil has no voltage at both ends, the common end is connected to the NC end, when the coil has voltage at both ends, the common end is connected to the NO end, and the diode D3 is connected between the coil pin 1 and the pin 5 of the relay D4. When the common end of the relay D4 is connected to the NO end, the circuit is turned on, the charging part 102 is started to charge the mobile phone, and when the common end of the relay D4 is connected to the NC end, the circuit is not turned on, the charging part 102 is closed to stop charging the mobile phone. The NC end is a normally closed contact, and the NO end is a normally open contact. When the mobile phone is fully charged or the charging is abnormal, the relay D4 cuts off the charging circuit to stop charging the mobile phone.

[0046] In the utility model, the central controller 101 is an STM32 single-chip microcomputer, the single-chip microcomputer board further integrates a Bluetooth module and a buzzer, the relay cuts off the charging circuit to stop charging and protect the battery. The buzzer intermittently sounds and sends the charging state to the mobile phone end through the Bluetooth module.

[0047] In use, the mobile phone is placed on the desktop, the recognition module 200 shoots the image on the desktop, the shot image is sent to the central controller 101, the central controller 101 recognizes the mobile phone in the image and obtains the position information of the recognized mobile phone, and then sends the control instruction to the first driver 302a and the second driver 303a, and the first driver 302a and the second driver 303a control the first driving motor 302b and the second driving motor 303b to start respectively, so that the charging part 102 is moved to the lower side of the mobile phone. The pin PA6 of the central controller 101 outputs a high level, the base of the triode Q1 receives the high level, so that the base of the triode Q1 is turned on, the collector of the triode Q1 is grounded, so that there is a voltage across the coil of the relay D4, the coil generates a magnetic field, and the common end of the relay D4 is attracted to the NO end; the circuit is turned on, and the charging part 102 charges the mobile phone.

[0048] When the mobile phone is fully charged or the charging is abnormal, the PA6 of the central controller 101 outputs a low level, the triode Q1 is not turned on, there is no voltage across the coil of the relay D4, the common end of the relay D4 is not subjected to the magnetic force, the common end of the relay D4 is bounced back to the NC end, the circuit is not turned on, and the charging part 102 stops charging the mobile phone.

[0049] In summary, by arranging the central controller 101, the charging part 102, the recognition module 200, the moving module 300 and the switch part 103, the mobile phone on the desktop can be recognized, and the charging part 102 can be controlled to move to the lower side of the mobile phone to charge the mobile phone.

[0050] Embodiment 3

[0051] Reference Figures 9-11 For the third embodiment of the utility model, different from the previous embodiment, the embodiment provides a desktop wireless charging system, and solves the problems of how to detect the voltage, current and magnetic field signal during wireless charging and how to protect the charging device, and the desktop wireless charging system comprises a central controller 101 which is further connected with a detection module 400, the detection module 400 comprises a voltage detection circuit 401, a current detection circuit 402 and a magnetic field detection circuit 403, the detection module 400 collects the voltage, current and magnetic field signal of the coil of the charging part 102 and transmits the collected information to the central controller 101.

[0052] Specifically, the input ends of the voltage detection circuit 401 and the current detection circuit 402 are connected with the coil of the charging member 102. The voltage detection circuit 401 comprises a transformer VS1 connected with the coil of the charging member 102, the pin 3 of the transformer VS1 is grounded, the pin 4 of the transformer VS1 is connected with a resistor R2 and an AC / DC converter U4 in sequence, and the collected AC voltage is converted into DC voltage through the AC / DC converter U4. The current detection circuit 402 comprises a slide rheostat, a current sensor U7 and an AC / DC converter U8 connected with the coil of the charging member 102 in sequence; the current detection circuit 402 collects AC voltage, converts the AC current into AC voltage through the current sensor U7, and then converts the AC voltage into DC voltage through the AC / DC converter U4.

[0053] Further, the voltage detection circuit 401 and the current detection circuit 402 are connected with the pins CH0 and CH1 of the analog-to-digital converter 404 respectively; the pins DIO and CLK of the analog-to-digital converter 404 are connected with the pins PA0 and PA1 of the central controller 101. The analog-to-digital converter 404 receives the DC voltage signals of the voltage detection circuit 401 and the current detection circuit 402 respectively, converts the received analog signals into digital signals, and then transmits the digital signals to the central controller 101; the central controller 101 processes and analyzes the received signals, and then transmits the signals to the mobile phone through the Bluetooth signal, so that the user can intuitively understand the voltage value and the current value of the mobile phone in the charging state. The current in different states is different during the charging process of the mobile phone. For example, the current is 1 amp when normally charging, and the current will decrease to tens of milliamperes when fully charged. Therefore, when the load changes, the power of the transmitting coil of the charging member 102 will also be adjusted. When the power of the mobile phone is close to full, the central controller 101 detects that the current is lower than the set value, the relay D4 cuts off the charging circuit and stops charging to protect the battery. The buzzer will intermittently sound and prompt, and at the same time, the charging state will be sent to the mobile phone through the Bluetooth module.

[0054] Further, the pins SPI_SCK, SPI_MISO and SPI_MOSI of the magnetic field detection circuit 403 are connected to PB3, PB4 and PB5 of the central controller 101 respectively. The magnetic field detection circuit 403 comprises a Hall sensor U2, which is of the model MLX90393 and can detect the change of the magnetic field. During the wireless charging process, the transmitting coil of the charging piece 102 generates an alternating magnetic field, the receiving coil of the charging piece 103 feels the alternating magnetic field and converts it into electric energy. If a metal foreign object is put into the charging area, the distribution of the magnetic field will change, which can be detected by the Hall sensor U2. The Hall sensor U2 transmits the collected signals to the central controller 101, which processes and analyzes the signals to determine whether a metal foreign object is generated. If a metal foreign object is generated, the central controller 101 controls the relay D4 to be disconnected, and the charging piece 102 is turned off. Otherwise, the charging continues.

[0055] In use, the voltage detection circuit 401, the current detection circuit 402 and the magnetic field detection circuit 403 collect the voltage, current and magnetic field signals of the coil of the charging piece 102 and transmit them to the central controller 101, which processes and analyzes the signals to control the charging piece 102 to be turned on or off and to control the charging efficiency.

[0056] In summary, by setting the voltage detection circuit 401, the current detection circuit 402 and the magnetic field detection circuit 403, the voltage, current and magnetic field signals of the charging piece 102 can be collected in real time, so as to adjust the charging efficiency, turn on or off the charging piece 102 and protect the battery of the mobile phone.

[0057] It is important to note that the construction and arrangement of the application shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review the present disclosure will readily appreciate that many modifications can be made to the embodiments without departing from the spirit and scope of the application as described in the claims. For example, the order in which steps are performed can be changed, or other steps can be added, omitted, or modified. Accordingly, all such modifications are intended to be included within the scope of the present application. The application is meant to encompass all techniques and structures that are the same as or similar to those described in this disclosure, and alternatives and modifications that are apparent to those skilled in the art are intended to be encompassed by the present claims. The claims should not be limited to the embodiments set forth in the specific written description and the drawings, but can include any other embodiments that fall within the scope of the present application as defined by the claims.

[0058] Furthermore, in order to provide a concise description of the exemplary embodiments, not all features of an actual implementation can be described.

[0059] It is understood that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions can be made. Such development efforts can inevitably lead to modifications, not all of which can be wholly incorporated into this disclosure. Moreover, it will be appreciated that the development of an actual implementation is a complex and time-consuming process that would not be reasonable in to capture in complete detail in this disclosure. The detailed description is, therefore, not to be taken in a literal sense, and the specific implementation described is meant to be illustrative only and not limiting as to the scope of the present application.

[0060] It should be noted that the above examples are merely used to illustrate the technical solutions of the present application, rather than limit the present application. Although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, and all should be included in the scope of the claims of the present application.

Claims

1. A desktop wireless charging system, characterized by: The utility model relates to a charging device for mobile phone, including, Charging module (100) including central controller (101), charging part (102), central controller (101) with charging part (102) electric connection; Identification module (200) is set up on the desktop and takes the image of mobile phone on the desktop, and is transmitted to central controller (101), and central controller (101) calculates the positioning coordinate of mobile phone on the desktop, and sends instruction to mobile component (300); The mobile component (300) is arranged on the back side of the desktop, and the charging part (102) is slidably arranged on the mobile component (300).

2. The desktop wireless charging system of claim 1, wherein: The pin P4 and P5 of the identification module (200) are connected with the pin PB10 and PB11 of the central controller (101).

3. The desktop wireless charging system of claim 1, wherein: The mobile component (300) includes a sliding table (301) arranged on the back side of the desktop and slidably connected with the charging part (102), a first driving part (302) connected with the horizontal axis and the vertical axis of the sliding table (301) respectively, and a second driving part (303).

4. The desktop wireless charging system of claim 3, wherein: The first driving part (302) includes a first driver (302a) and a first driving motor (302b), the first driving motor (302b) and the first driver (302a) are electrically connected, the pins CP-, DIR-, and EN- of the first driver (302a) are connected with the pins PA3, PA4, and PA5 of the central controller (101) respectively. The second driving part (303) includes a second driver (303a) and a second driving motor (303b), the second driving motor (303b) and the second driver (303a) are electrically connected, the pins CP-, DIR-, and EN- of the second driver (303a) are connected with the pins PA7, PB0, and PB1 of the central controller (101) respectively.

5. The desktop wireless charging system of any one of claims 1-4, wherein: The central controller (101) and the charging part (102) are provided with a switch part (103), the switch part (103) includes a transistor Q1 and a relay D4, the collector of the transistor Q1 is connected with the coil pin 5 of the relay D4, the base of the transistor Q1 is connected with the pin PA6 of the central controller (101), and the emitter of the transistor Q1 is grounded.

6. The desktop wireless charging system of claim 5, wherein: The relay D4 includes a common terminal, an NO terminal, and an NC terminal, when there is no voltage between the two ends of the coil, the common terminal is connected to the NC terminal, and when there is voltage between the two ends of the coil, the common terminal is connected to the NO terminal. The coil pin 1 and the pin 5 of the relay D4 are connected with a diode D3.

7. The desktop wireless charging system of claim 6, wherein: The central controller (101) is further connected with a detection module (400), the detection module (400) includes a voltage detection circuit (401), a current detection circuit (402), and a magnetic field detection circuit (403), the detection module (400) collects the voltage, current, and magnetic field signals of the coil of the charging part (102) and transmits them to the central controller (101).

8. The desktop wireless charging system of claim 7, wherein: The input ends of the voltage detection circuit (401) and the current detection circuit (402) are connected with the coil of the charging part (102).

9. The desktop wireless charging system of claim 8, wherein: The voltage detection circuit (401) and the current detection circuit (402) are connected with the pins CH0 and CH1 of the analog-digital converter (404) respectively; The pins DIO and CLK of the analog-digital converter (404) are connected with the pins PA0 and PA1 of the central controller (101).

10. The desktop wireless charging system of claim 9, wherein: The pins SPI_SCK, SPI_MISO and SPI_MOSI of the magnetic field detection circuit (403) are connected with the pins PB3, PB4 and PB5 of the central controller (101) respectively.

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