Charging device, electronic device, and charging system

Abstract

The application discloses a charging device, an electronic device and a charging system, and belongs to the technical field of wireless charging. The charging device comprises a first power supply end, a first switch, a second switch, a first coil and a first control module. The first switch and the second switch are connected in parallel between the first power supply end and the first coil. The first control module is connected with the first switch and the second switch respectively to control the conduction state of the first switch and the second switch. When the charging device detects that a to-be-charged device is close, the first control module controls the first switch to be in a periodic conduction state and the second switch to be in an off state, and the charging device generates a first magnetic attraction force. When the charging device determines that the to-be-charged device enters a charging mode, the first control module controls the second switch to be in a conduction state and the first switch to be in an off state.

Description

Technical Field

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

[0002] When wireless charging mobile devices are being wirelessly charged, the charging coils of the device to be charged and the charging coils of the charging device must be aligned. Otherwise, the charging may not be effective or may be interrupted during the charging process.

[0003] In related technologies, to ensure that the charging coil of the device to be charged can be aligned with that of the charging device, multiple coils are often set up, and these coils are arranged in parallel or overlapping to increase the coverage area of ​​the charging coils. However, this stacking method occupies a lot of space, which is not conducive to the thinning and lightening of the charging device, and when multiple coils work at the same time, only the energy of some coils is transferred to the device to be charged, resulting in low energy utilization.

[0004] Therefore, existing technologies cannot simultaneously achieve accurate alignment between the device to be charged and the charging coil, and the goal of making the charging device thinner and lighter. Summary of the Invention

[0005] The purpose of this application is to provide a charging device, electronic device, and charging system that can improve the alignment accuracy of the charging coils of the charging device and the device to be charged, and can achieve a thinner and lighter design for the charging device.

[0006] In a first aspect, embodiments of this application provide a charging device, including a first power supply terminal, a first switch, a second switch, a first coil, and a first control module. The first switch and the second switch are connected in parallel between the first power supply terminal and the first coil. The first control module is connected to the first switch and the second switch respectively to control the conduction state of the first switch and the second switch. When the charging device detects that a device to be charged is approaching, the first control module controls the first switch to be in a periodic conduction state and the second switch to be in an off state, and the charging device generates a first magnetic attraction force. When the charging device determines that the device to be charged has entered the charging mode, the first control module controls the second switch to be in a conduction state and the first switch to be in an off state.

[0007] Secondly, embodiments of this application provide an electronic device, including a second power supply terminal, a third switch, a fourth switch, a second coil, a second control module, and a first magnetic sensor. The third switch and the fourth switch are connected in parallel between the second power supply terminal and the second coil. The second control module is connected to the third switch and the fourth switch respectively to control the conduction state of the third switch and the fourth switch. The first magnetic sensor is connected in parallel between the third switch and the second coil. When the first magnetic sensor senses proximity to a charging device, the second control module controls the third switch to be in a periodic conduction state and the fourth switch to be in an off state, and the electronic device generates a second magnetic attraction force. When the electronic device enters a charging mode, the second control module controls the fourth switch to be in a conduction state and the third switch to be in an off state.

[0008] Thirdly, embodiments of this application provide a charging system, including any of the charging devices and electronic devices provided in the first aspect above.

[0009] This application provides a charging device. Based on the above configuration, after detecting the proximity of a device to be charged, the first control module controls a first switch to be in a periodically conducting state. The periodic conduction of the first switch magnetizes the first coil, generating a first magnetic field around it. This, in turn, causes the charging device to generate a first magnetic attraction force. This force attracts the magnetic components in the device, guiding it closer. Simultaneously, the periodic conduction of the first switch causes the magnetic attraction force to change periodically, creating a "vibration" sensation in the device, further guiding the user to move the device to the charging position on the charging device. This improves the alignment speed between the device and the charging device, enhancing charging convenience. Furthermore, after the charging device determines that the device has entered charging mode, the first control module controls the first switch to open and the second switch to open, switching the first coil from magnetic attraction mode to charging mode. This stops generating the periodic first magnetic attraction force, preventing interference with the charging process. Simultaneously, the charging circuit, activated by the second switch, supplies charging energy to the first coil, achieving stable wireless charging of the device and improving charging efficiency and safety. The charging coil provided by this application can achieve magnetic alignment before charging and energy radiation during charging, which means that the charging coil can be reused. Therefore, the internal structure of the charging device is simplified, which is conducive to the thinner and lighter design of the charging device.

[0010] Additional aspects and advantages of the invention 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 the invention. Attached Figure Description

[0011] Figure 1A circuit diagram illustrating the cooperation between a charging device and an electronic device, provided as an embodiment of this application;

[0012] Figure 2 A schematic diagram illustrating the charging guidance process for a charging device and an electronic device provided in this application embodiment;

[0013] Figure 3 A circuit diagram illustrating the cooperation between a charging device and an electronic device charging guidance circuit, as provided in an embodiment of this application;

[0014] Figure 4 A schematic diagram illustrating the charging guidance process for another charging device and electronic device provided in this application embodiment;

[0015] Figure 5 This is a structural block diagram of a charging system provided in an embodiment of this application.

[0016] Reference numerals: 1 Charging system; 10 Charging device; 20 Electronic device; DC1 First power supply terminal; Q1 First switch; L1 First coil; 110 First control module; 111 First timer; SQ2 Second magnetic sensor; Q2 Second switch; DC2 Second power supply terminal; Q3 Third switch; L2 Second coil; 210 Second control module; SQ1 First magnetic sensor; Q4 Fourth switch; 220 Magnetic metal ring. Detailed Implementation

[0017] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0018] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0019] The charging device, electronic device, and charging system provided in this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.

[0020] like Figures 1 to 4 As shown in the figure, a charging device 10 provided in this application embodiment includes a first power supply terminal DC1, a first switch Q1, a second switch Q2, a first coil L1, and a first control module 110. The first switch Q1 and the second switch Q2 are connected in parallel between the first power supply terminal DC1 and the first coil L1. The first control module 110 is connected to the first switch Q1 and the second switch Q2 respectively to control the conduction state of the first switch Q1 and the second switch Q2. When the charging device 10 detects that the device to be charged is close, the first control module 110 controls the first switch Q1 to be in a periodic conduction state and the second switch Q2 to be in an off state, and the charging device 10 generates a first magnetic attraction force. When the charging device 10 determines that the device to be charged has entered the charging mode, the first control module 110 controls the second switch Q2 to be in a conduction state and the first switch Q1 to be in an off state.

[0021] In the above embodiments, based on the above settings, the charging device 10 can, after detecting the proximity of the device to be charged, control the first switch Q1 to be in a periodically conducting state through the first control module 110. The periodic conduction of the first switch Q1 can magnetize the first coil L1, generating a first magnetic field around the first coil L1, thereby causing the charging device 10 to generate a first magnetic attraction force. The first magnetic attraction force can attract the magnetic components in the device to be charged, guiding the device to be charged to approach the charging device 10. At the same time, the periodic conduction of the first switch Q1 can cause the first magnetic attraction force to change periodically, causing the device to be charged to generate a "vibration" sensation, further guiding the user to move the device to be charged to the charging position on the charging device 10, thereby improving the alignment speed between the device to be charged and the charging device 10 and improving the convenience of charging. Furthermore, after the charging device 10 determines that the device to be charged has entered the charging mode, the first control module 110 controls the first switch Q1 to open and the second switch Q2 to open, causing the first coil L1 to switch from magnetic attraction conduction mode to charging mode, stopping the generation of periodic first magnetic attraction force, thus avoiding interference with the charging process. At the same time, through the charging circuit opened by the second switch Q2, charging energy is delivered to the first coil L1, realizing stable wireless charging of the device to be charged, improving charging efficiency and safety. In addition, the first coil L1 can achieve magnetic alignment before charging and can radiate energy during charging, thus simplifying the internal structure of the charging device 10 and facilitating the thinner and lighter design of the charging device 10.

[0022] For example, the device to be charged can be a mobile phone, smartwatch, Bluetooth headset, etc., without further limitation.

[0023] It should be noted that in related technologies, to facilitate quick alignment between the device to be charged and the charging device 10, multiple first coils are often set in the charging device 10, thereby increasing the area of ​​the charging coil's corresponding region. This method suffers from several drawbacks: firstly, only a portion of the energy from the first coil is transferred to the device being charged, resulting in low efficiency and high heat generation; secondly, the use of multiple first coils increases the size of the charging device 10. However, this application, based on the aforementioned charging device 10, not only eliminates the need for manual alignment, but also automatically guides the alignment between the device to be charged and the charging device 10 through a magnetic field, improving the alignment speed and charging convenience; furthermore, the periodic conduction of the first switch Q1 further enhances the guiding efficiency, thereby increasing the alignment speed and charging convenience. Moreover, only one coil is needed to achieve rapid alignment between the device to be charged and the charging device 10, improving the energy transfer efficiency between them, reducing energy waste, and simultaneously reducing the size of the charging device 10.

[0024] For example, such as Figure 1 and Figure 3 As shown, GND1, GND2, GND3 and GND4 are all ground terminals; the first control module 110 controls the first switch Q1 through the first control line CTL1, and controls the second switch Q2 through the second control line CTL2; the second control module 210 controls the third switch Q3 through the third control line CTL3, and controls the fourth switch Q4 through the fourth control line CTL4.

[0025] In some embodiments of this application, the first control module 110 includes a first timer 111. The first timer 111 starts timing when the first switch Q1 enters a periodic conduction state. When a first preset time is reached, the first control module 110 determines that the device to be charged has entered the charging mode and controls the second switch Q2 to conduct.

[0026] In the above embodiment, the first control module 110 further includes a first timer 111. The first timer 111 starts timing synchronously when the first switch Q1 enters the periodic conduction state, controlling the total duration of magnetic attraction and conduction. When the timing reaches the preset first preset time, the first timer 111 triggers a state switching command, which is handed over to the first control module 110 to control the second switch Q2 to conduct, switching to the charging mode. This can not only ensure sufficient magnetic attraction and conduction time and improve alignment accuracy, but also simplify the control logic, realize the automatic and smooth switching of the state, and improve the stability and reliability of the charging device 10.

[0027] like Figure 1 and Figure 3As shown, in some embodiments of this application, when the first magnetic attraction force is detected to be greater than the first magnetic force threshold, the first control module 110 controls the first switch Q1 to remain on, and after a first duration, turns off the first switch Q1 and controls the second switch Q2 to be on.

[0028] In the above embodiments, as the distance between the charging device 10 and the device to be charged gradually decreases, the first magnetic attraction between the charging device 10 and the device to be charged also increases accordingly. That is, the magnitude of the first magnetic attraction corresponds to the distance between the charging device 10 and the device to be charged. When the magnitude of the first magnetic attraction reaches the first magnetic force threshold, it indicates that the device to be charged is close enough to the charging device 10. At this time, the first control module 110 will continuously conduct the first switch Q1 for a first duration, which can generate a continuous guiding first magnetic attraction between the charging device 10 and the device to be charged. This can prevent the device from deviating due to changes in the magnetic field, improve the accuracy and stability of alignment, and also make it easier for the user to place the device to be charged on the corresponding charging position on the charging device 10 in accordance with the guiding magnetic attraction.

[0029] It is understandable that the first magnetic attraction force is the magnetic attraction force generated by the charging device 10 and acting on the device to be charged; the first duration is a fixed period of time during which the first switch Q1 is continuously turned on.

[0030] like Figure 1 and Figure 3 As shown, in some embodiments of this application, the first control module 110 is further configured to detect the first current in the first coil L1, and control the first switch Q1 to remain on continuously when the first current remains unchanged for a second duration.

[0031] In the above embodiment, the second duration is a time window for determining whether the first current is stable. The first control module 110 can detect the first current passing through the first coil L1. Since the intensity of the first current is affected by the magnetic field, if the first current remains unchanged for the second duration, it indicates that the magnetic field between the charging device 10 and the device to be charged has stabilized, thereby determining that the device to be charged has been placed in place.

[0032] For example, the device to be charged includes a first magnetic force sensor SQ1 and a third switch Q3, which can be used to sense a first magnetic attraction force. In response to the first magnetic attraction force exceeding a first magnetic force threshold, the third switch Q3 of the device to be charged remains continuously open to stabilize the second magnetic field of the device. Thus, based on the continuous opening of the third switch Q3, the first current can remain constant during the second duration. In this way, by utilizing the feedback action of the continuously open third switch Q3 of the device to be charged to form a closed-loop detection, the accuracy of determining the first magnetic force threshold can be improved.

[0033] For example, Q can be preset as a preset difference amplitude threshold. If the difference amplitude of the current change is less than Q, the first current can be considered stable.

[0034] like Figure 1 and Figure 3 As shown, in some embodiments of this application, the first magnetic sensor SQ1 can be connected to the second control module 210 through the first sensing branch MS1; the second magnetic sensor SQ2 can be connected to the first control module 110 through the second sensing branch MS2; R1 and R2 are acquisition resistors used to form feedback current, which is transmitted to the first control module 110 and the second control module 210 through the first feedback branch IS1 and the second feedback branch IS2.

[0035] like Figures 1 to 4 As shown, in some embodiments of this application, the first switch Q1 is a first metal-oxide-semiconductor transistor, and the charging device 10 further includes a second magnetic sensor SQ2, which is connected in parallel with the first metal-oxide-semiconductor transistor and the first coil L1. The second magnetic sensor SQ2 is used to detect the second magnetic attraction force generated by the device to be charged. When the second magnetic attraction force is greater than the second magnetic threshold, the first control module 110 controls the first switch Q1 to remain on.

[0036] In the above embodiment, the first switch Q1 is a first metal-oxide-semiconductor transistor (MOSFET), and the charging device 10 further includes a second magnetic sensor SQ2. The first MOSFET and the first coil L1 are connected in series, and the second magnetic sensor SQ2 is connected in parallel to the first MOSFET and the first coil L1. The second magnetic sensor SQ2 is used to sense the magnitude of a second magnetic attraction force. When the second magnetic attraction force sensed by the second magnetic sensor SQ2 is greater than a second magnetic force threshold, the first control module 110 turns on the first switch Q1 and keeps it on for a first duration, then turns off the first switch Q1. The second magnetic sensor SQ2 can sense the first magnetic attraction force more accurately and quickly, thereby improving the response speed of the first control module 110. Turning off the first switch Q1 after the first duration avoids energy waste.

[0037] It is understandable that the first magnetic attraction force and the second magnetic attraction force are the mutual magnetic forces between the charging device 10 and the device to be charged: the first magnetic attraction force is the magnetic attraction force generated by the charging device 10 and acting on the device to be charged; the second magnetic attraction force is the magnetic attraction force generated by the device to be charged and acting on the charging device 10. The two are equal in magnitude and opposite in direction, and together they constitute the magnetic attraction interaction between the devices.

[0038] like Figure 1 and Figure 3As shown, in some embodiments of this application, when entering the magnetic guidance mode and the timer reaches the third duration, the first control module 110 turns off the first switch Q1 and turns on the second switch Q2.

[0039] Figure 2 and Figure 4 The countdown in the middle lasts for the third time.

[0040] In the above embodiment, after entering the magnetic guidance mode, the first control module 110 will turn off the first switch Q1 and turn on the second switch Q2 after a third period of time, switching from the magnetic guidance mode to the charging mode. This can prevent the guidance process from looping indefinitely due to magnetic field interference or failure of the device to be charged, and also avoid the guiding element used for magnetic guidance from overheating due to long-term operation.

[0041] For example, both the first switch Q1 and the second switch Q2 are metal-oxide-semiconductor transistors.

[0042] like Figure 3 As shown, in some embodiments of this application, the first switch Q1 is a first metal-oxide-semiconductor transistor, and the charging device 10 further includes a second magnetic sensor SQ2, which is connected in parallel with the first metal-oxide-semiconductor transistor and the first coil L1. When the second magnetic attraction force sensed by the second magnetic sensor SQ2 increases, the first control module 110 shortens the period of periodic conduction of the first switch. This eliminates the need for device communication, allowing for local detection within the charging device 10, resulting in a faster response time and reducing the risk of communication failures.

[0043] like Figures 1 to 4 As shown, in a second aspect, an electronic device 20 provided in this application includes a second power supply terminal DC2, a third switch Q3, a fourth switch Q4, a second coil L2, a second control module 210, and a first magnetic sensor SQ1. The third switch Q3 and the fourth switch Q4 are connected in parallel between the second power supply terminal DC2 and the second coil L2. The second control module 210 is connected to the third switch Q3 and the fourth switch Q4 respectively to control the conduction state of the third switch Q3 and the fourth switch Q4. The first magnetic sensor SQ1 is connected in parallel between the third switch Q3 and the second coil L2. When the first magnetic sensor SQ1 senses proximity to the charging device 10, the second control module 210 controls the third switch Q3 to be in a periodic conduction state and the fourth switch Q4 to be in an off state, and the electronic device 20 generates a second magnetic attraction force. When the electronic device 20 enters the charging mode, the second control module 210 controls the fourth switch Q4 to be in a conduction state and the third switch Q3 to be in an off state.

[0044] In the above embodiment, based on the above settings, after the first magnetic sensor SQ1 senses the charging device 10 approaching, the electronic device 20 controls the third switch Q3 to be in a periodically conducting state through the second control module 210. The periodic conduction of the third switch Q3 magnetizes the second coil L2, generating a second magnetic field around the second coil L2, thereby causing the electronic device 20 to generate a second magnetic attraction force. The second magnetic attraction force can attract the magnetic components in the charging device 10, further improving the alignment efficiency between devices. At the same time, the periodic conduction of the third switch Q3 can cause the second magnetic attraction force to change periodically, generating a "vibration" in the electronic device 20, which more intuitively guides the user to move the electronic device 20 to the precise charging position. After the electronic device 20 enters the charging mode, the second control module 210 controls the third switch Q3 to open and the fourth switch Q4 to open, so that the second coil L2 switches from the magnetic attraction conduction mode to the charging mode, stops generating the periodic second magnetic attraction force, and avoids interference with the wireless charging process; at the same time, through the charging circuit opened by the fourth switch Q4, charging energy is delivered to the second coil L2 to achieve stable wireless charging docking with the charging device 10, thereby improving charging efficiency and safety.

[0045] For example, the second control module 210 controls the third switch Q3 through the third control line CTL3.

[0046] like Figure 1 As shown, in some embodiments of this application, the second control module 210 receives a first waveform generated by the first magnetic sensor SQ1 according to the periodic second magnetic attraction force. When it is determined that the first waveform conforms to a predetermined waveform pattern, the third switch Q3 is controlled to be in a periodic conducting state starting from the positive period of the first waveform.

[0047] In the above embodiment, the second control module 210 can receive the first waveform generated by the first magnetic sensor SQ1 according to the periodic second magnetic attraction force, and judge the first waveform. If the first waveform conforms to the preset waveform pattern, the third switch Q3 is periodically turned on starting from the positive period of the first waveform to magnetize the second coil L2, so that the first coil L1 and the second coil L2 can generate a mutual attraction force.

[0048] like Figure 1 As shown, in some embodiments of this application, when the first magnetic attraction force sensed by the first magnetic sensor SQ1 is greater than the first magnetic threshold, the second control module 210 controls the third switch Q3 to remain on, and after a first duration, turns off the third switch Q3.

[0049] In the above embodiment, as the distance between the charging device 10 and the electronic device 20 gradually decreases, the first magnetic attraction between them also increases, meaning the magnitude of the first magnetic attraction corresponds to the distance between them. When the magnitude of the first magnetic attraction reaches a first magnetic threshold, it indicates that the electronic device 20 is sufficiently close to the charging device 10. At this time, the second control module 210 continuously conducts the third switch Q3 for a first duration, generating a continuous first magnetic attraction between the charging device 10 and the electronic device 20. This prevents deviation in device guidance due to changes in the magnetic field, improving the accuracy and stability of alignment. It also facilitates the user placing the electronic device 20 onto the corresponding charging position on the charging device 10 in accordance with the first magnetic attraction.

[0050] like Figure 1 and Figure 2 As shown, in some embodiments of this application, the third switch Q3 is a third metal-oxide-semiconductor transistor, the fourth switch Q4 is a fourth metal-oxide-semiconductor transistor, and the fourth switch Q4 is connected in parallel with the third switch Q3; wherein, the second control module 210 is used to control the fourth switch Q4 to open and the third switch Q3 to open according to the charging signal of the charging device 10; the second control module 210 is also used to control the fourth switch Q4 to open after the third switch Q3 is closed.

[0051] In the above embodiment, the third switch Q3 is a third metal-oxide-semiconductor transistor (MOSFET), and the fourth switch Q4 is a fourth MOSFET; the fourth switch Q4 is used to charge the electronic device 20. In practical applications, the charging device 10 sends a charging signal to the electronic device 20, and the electronic device 20 closes the fourth switch Q4 and turns on the third switch Q3 through the second control module 210, entering the magnetic guidance mode. This avoids interference between the charging circuit and the guidance circuit. After the second control module 210 closes the third switch Q3, the guidance circuit is closed, and the fourth switch Q4 is turned on to open the charging circuit, thus avoiding interference between the guidance circuit and the charging circuit. Through the control of the third switch Q3 and the fourth switch Q4 by the second control module 210, the automatic switching between the magnetic guidance mode and the charging mode is realized, and mutual interference between the magnetic guidance mode and the charging mode is avoided, which is beneficial to improving the user experience.

[0052] Understandably, this also allows for matching the circuit switching logic of the charging device 10, achieving bidirectional circuit isolation.

[0053] like Figure 2As shown, in some embodiments of this application, after entering the magnetic guidance mode and reaching the third duration, the second control module 210 turns off the third switch and turns on the fourth switch Q4. This prevents the guidance process from looping indefinitely due to magnetic field interference or malfunction of the electronic device 20, and also avoids overheating of the guiding element used for magnetic guidance due to prolonged operation.

[0054] It should be noted that existing wireless charging protocols include: Induction coil: The transmitting coil inside the wireless charger continuously generates an alternating electromagnetic field. Electromagnetic induction: When the built-in receiving coil of a compatible electronic device 20 is placed in the induction area of ​​the charger, the receiving coil of the electronic device 20 receives the change in the electromagnetic field. Communication and activation: The receiving coil generates current through electromagnetic induction. After the mobile phone detects the current, it communicates with the charger to confirm that it is a mobile phone and needs charging. Charging initiation: After successful communication, the charger adjusts its transmission power to transfer electromagnetic field energy to the phone's battery, initiating the charging process.

[0055] In some embodiments of this application, such as Figure 1 As shown, the charging device 10 provided in the first aspect can be used in conjunction with the electronic device 20 provided in the second aspect. Because the second switch Q2 and the fourth switch Q4 have their original wireless charging communication protocols, the switching of the first switch Q1 and the third switch Q3 cannot affect the original protocols. The switching of the first switch Q1 and the third switch Q3 needs to be initiated during the communication interval. Therefore, synchronous triggering is required.

[0056] Specifically, such as Figure 2As shown, first, place electronic device 20 on charging device 10 to initiate the process. S11: Electromagnetic induction initiates communication; the device establishes communication with the mobile phone via electromagnetic induction. S12: Recognize as a compatible device and prepare for charging; electronic device 20 is recognized as a compatible device, completing pre-charging preparation. S13: Switch to magnetic guidance mode; after completing the initial routine communication recognition, charging device 10 and electronic device 20 switch to magnetic guidance mode. S14: Charging device and electronic device simultaneously start a countdown; for time synchronization in subsequent operations. S15: Periodically open or close Q1 and Q3 in sync with the timing system; based on the timing system, periodically open or close the first switch Q1 and the third switch Q3 to generate magnetic field guidance. The timer starts working, while the second switch Q2 and the fourth switch Q4 are simultaneously closed. Since the charging device 10 and the electronic device 20 start timing synchronously, both are set to turn on at time T1, turn off at time T2, and so on, turning on at time T2n+1 and turning off at time T2n+2. At this time, the electronic device 20 and the charging device 10 are relatively close. When both the first switch Q1 and the third switch Q3 are on, the user can feel the magnetic attraction. Because the switching is alternating, there will be a certain "vibration." The user moves the electronic device 20 and feels the "vibration," moving in the direction of the stronger "vibration," with a frequency of approximately a few Hz. S16: Does the magnetic attraction detected by SQ1 exceed the threshold K? If not: return to S15 and continue periodically switching the first switch Q1 and the third switch Q3; if it exceeds: proceed to S17. S17: Q3 remains on; the first magnetic sensor SQ1 is set to a threshold K. When the magnetic attraction exceeds the value of K, the electronic device 20 continuously keeps the third switch Q3 on. S18: Detect whether the difference in current level is less than Q; Q is a preset difference threshold used to determine whether the current is stable; if not less than: return to S17 and keep the third switch Q3 open; if less than: proceed to S19. S19: Q1 remains open. S20: Has the countdown ended? If not: return to S19 and keep the first switch Q1 open; if ended: proceed to S21 and begin the charging process. S21: Close Q1 and Q3; enter the normal wireless charging process, open Q2 and Q4 to enter high-frequency AC charging, and end the guidance. The charging device 10 can read the current feedback. Due to the continuous existence of magnetic attraction, the change in current intensity indicates that the other party has been placed in position. The charging device 10 also keeps the first switch Q1 open for X hours, then opens the first switch Q1, and the magnetic attraction disappears. After the first magnetic sensor SQ1 senses that the other party's magnetic attraction has disappeared, the third switch Q3 closes. Enter the normal wireless charging process, switch the second switch Q2 and the fourth switch Q4 to high-frequency AC charging mode, and end the guidance. Once the setup is complete, the original protocol will be notified, and the next step will be initiated to start charging. If the above steps time out (Tout), the first switch Q1 and the third switch Q3 will be automatically disconnected to avoid energy waste.After the magnetic attraction is completed, the first switch Q1 and the third switch Q3 are actively turned off, and the original charging protocol continues. The second switch Q2 and the fourth switch Q4 are turned on to perform normal wireless charging. The charging device 10 switches the second switch Q2 to generate an ultra-high frequency of several hundred kHz to tens of MHz, which induces a current in the electronic device 20 for charging through electromagnetic coupling. Here, the magnetic attraction is the magnetic attraction between the charging device 10 and the electronic device 20.

[0057] like Figure 3 and Figure 4 As shown in the embodiment of this application, an electronic device 20 includes a magnetic metal ring 220. The magnetic metal ring 220 is induced by a periodic first magnetic attraction force generated by the charging device 10 to generate a periodic second magnetic attraction force. The first magnetic attraction force and the second magnetic attraction force form a magnetic attraction between the charging device 10 and the electronic device 20, guiding the electronic device 20 to move towards the charging position of the charging device 10.

[0058] In the above embodiments, an electronic device 20 includes a magnetic metal ring 220. The magnetic metal ring 220 can sense a first magnetic attraction force from the charging device 10 and generate a second magnetic attraction force. Since the first magnetic attraction force changes periodically, the magnetic metal ring 220 generates a second magnetic attraction force that also changes periodically through magnetic induction. Through the interaction between the first and second magnetic attraction forces, the electronic device 20 is guided to move towards the charging position of the charging device 10. No manual alignment is required; the magnetic field automatically guides the device, improving the alignment speed between the electronic device 20 and the charging device 10 and enhancing charging convenience.

[0059] It is understandable that as the frequency of the first magnetic attraction force in the charging device 10 changes, a second magnetic attraction force is generated through the magnetic metal ring 220. The interaction between the first and second magnetic attraction forces can also cause the electronic device 20 to vibrate, and guide the user to move the electronic device 20 to the charging position on the charging device 10 through the vibration.

[0060] like Figure 3 and Figure 4As shown, in some embodiments of this application, the electronic device 20 further includes: a second power supply terminal DC2, a fourth switch Q4, a second coil L2, and a second control module 210. The second power supply terminal DC2, the fourth switch Q4, and the second coil L2 are connected in series. The second control module 210 is connected to the fourth switch Q4 and is used to control the conduction state of the fourth switch Q4. After receiving a charging inquiry message from the charging device 10, the second control module 210 sends a charging response to the charging device 10 and controls the fourth switch Q4 to turn off. Furthermore, after the second magnetic attraction induced by the magnetic metal ring 220 disappears, the second control module 210 controls the fourth switch Q4 to turn on. This avoids interference between the charging circuit and the guiding circuit. After the second magnetic attraction induced by the magnetic metal ring 220 disappears, the fourth switch Q4 is turned on, opening the charging circuit. This achieves automatic switching between the magnetic guiding mode and the charging mode and avoids mutual interference between the magnetic guiding mode and the charging mode, which is beneficial to improving the user experience.

[0061] like Figure 3 and Figure 4 As shown, in some embodiments of this application, after entering the magnetic guidance mode and reaching the third duration, the second control module 210 controls the fourth switch Q4 to be turned on.

[0062] In the above embodiment, if the guiding mode exceeds the third duration, the second control module 210 automatically responds by turning on the fourth switch Q4, switching to charging mode. This prevents the device from failing to exit the guiding state due to the continuous presence of a magnetic field during passive guiding.

[0063] It should be noted that existing wireless charging protocols include: Induction coil: The transmitting coil inside the wireless charger continuously generates an alternating electromagnetic field. Electromagnetic induction: When the built-in receiving coil of a compatible electronic device 20 is placed in the induction area of ​​the charger, the receiving coil of the electronic device 20 receives the change in the electromagnetic field. Communication and activation: The receiving coil generates current through electromagnetic induction. After the mobile phone detects the current, it communicates with the charger to confirm that it is a mobile phone and needs charging. Charging initiation: After successful communication, the charger adjusts its transmission power to transfer electromagnetic field energy to the phone's battery, initiating the charging process.

[0064] In some embodiments of this application, such as Figure 4 As shown, the charging device 10 provided by the first aspect can be used in conjunction with the electronic device 20 provided by the third aspect. Because the second switch Q2 and the fourth switch Q4 have their original wireless charging communication protocols, the switching of the first switch Q1 cannot affect the original protocol. The switching of the first switch Q1 needs to be initiated during the communication interval. Therefore, synchronous triggering is required.

[0065] Specifically, first, place electronic device 20 on charging device 10 to initiate the process. S11: Electromagnetic induction initiates communication; the device establishes communication with the mobile phone via electromagnetic induction. S12: Recognize as a compatible device and prepare for charging; electronic device 20 is recognized as a compatible device, completing pre-charging preparation. S13: Switch to magnetic guidance mode; after completing the initial routine communication recognition, charging device 10 and electronic device 20 switch to magnetic guidance mode. S14: Charging device and electronic device simultaneously begin countdown; for time synchronization in subsequent operations. S31: The timing system periodically opens or closes Q1 synchronously; the timer starts working, simultaneously closing the second switch Q2 and the fourth switch Q4. Since the charging device 10 and the electronic device 20 start timing synchronously, both are set to turn on at time T1, turn off at time T2, and so on, turning on at time T2n+1 and turning off at time T2n+2. At this time, the electronic device 20 and the charging device 10 are relatively close. When the first switch Q1 is turned on, the user can feel a magnetic attraction. Because the switching is alternating, there will be a certain "vibration." The user moves the electronic device 20 and feels the "vibration," moving in the direction of the stronger "vibration," with a frequency of approximately a few Hz. S32: Does the magnetic attraction detected by SQ2 exceed the threshold K? If not: return to S31 and continue periodically switching the first switch Q1; if it exceeds: proceed to S33. S33: Q1 remains open; keep the first switch Q1 in the open state. The second magnetic sensor SQ2 is set with a threshold K. When the magnetic attraction exceeds the value of K, the electronic device 20 continues to keep the first switch Q1 open. S34: Detect whether the difference in current level is less than Q or whether the countdown has ended; Q is a preset difference threshold used to determine whether the current is stable; if not less than: return to S33 and keep the first switch Q1 open; if less than: proceed to S35. S35: Close Q1; enter the normal wireless charging process, open Q2 and Q4 to enter high-frequency AC charging; switch the second switch Q2 and the fourth switch Q4 to high-frequency AC charging mode, and end the guidance. If not less than or the countdown has ended: return to S33. The charging device 10 can read the current feedback. Due to the continuous magnetic attraction, the change in current intensity can detect that the other party has been placed in place. The guidance is completed, the original protocol is notified, and the next step is initiated to start charging. If the above steps time out (Tout), the first switch Q1 will be actively cut off to avoid energy waste. After the magnetic attraction is completed, the first switch Q1 is turned off, and the original charging protocol continues. The second switch Q2 and the fourth switch Q4 are turned on to perform normal wireless charging. The charging device 10 turns on the second switch Q2 to generate an ultra-high frequency of hundreds of kHz to tens of MHz, which causes the electronic device 20 to induce current for charging through electromagnetic coupling.

[0066] like Figure 5As shown, in a third aspect, embodiments of this application provide a charging system 1, including any of the charging devices 10 and electronic devices 20 as provided in the first aspect above. Therefore, all the specific beneficial effects will not be elaborated here.

[0067] 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 the invention. 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.

[0068] Although embodiments of the invention 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 the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A charging device, characterized in that, It includes a first power supply terminal, a first switch, a second switch, a first coil, and a first control module. The first switch and the second switch are connected in parallel between the first power supply terminal and the first coil. The first control module is connected to the first switch and the second switch respectively to control the conduction state of the first switch and the second switch. When the charging device detects that the device to be charged is approaching, the first control module controls the first switch to be in a periodic conducting state and the second switch to be in a de-energized state, and the charging device generates a first magnetic attraction force. When the charging device determines that the device to be charged has entered the charging mode, the first control module controls the second switch to be in the on state and the first switch to be in the off state.

2. The charging device according to claim 1, characterized in that, The first control module includes a first timer, which starts timing when the first switch enters a periodic conduction state. When a first preset time is reached, the first control module determines that the device to be charged has entered the charging mode and controls the second switch to conduct.

3. The charging device according to claim 1, characterized in that, When the first control module detects that the first magnetic attraction force is greater than the first magnetic force threshold, it controls the first switch to remain on. After a first duration, the first switch is turned off, and the second switch is turned on.

4. The charging device according to claim 3, characterized in that, The first control module is also used to detect the first current in the first coil, and control the first switch to remain on continuously when the first current remains unchanged for a second duration.

5. The charging device according to claim 3, characterized in that, The first switch is a first metal-oxide-semiconductor transistor, and the charging device further includes a second magnetic sensor, which is connected in parallel with the first switch and the first coil; The second magnetic sensor is used to detect the second magnetic attraction force generated by the device to be charged. When the second magnetic attraction force is greater than the second magnetic threshold, the first control module controls the first switch to remain on.

6. An electronic device, characterized in that, The device includes a second power supply terminal, a third switch, a fourth switch, a second coil, a second control module, and a first magnetic sensor. The third switch and the fourth switch are connected in parallel between the second power supply terminal and the second coil. The second control module is connected to the third switch and the fourth switch respectively to control the conduction state of the third switch and the fourth switch. The first magnetic sensor is connected in parallel between the third switch and the second coil. When the first magnetic sensor detects proximity to the charging device, the second control module controls the third switch to be in a periodic on state and the fourth switch to be in an off state, and the electronic device generates a second magnetic attraction force; when the electronic device enters the charging mode, the second control module controls the fourth switch to be in a on state and the third switch to be in an off state.

7. The electronic device according to claim 6, characterized in that, The second control module receives the first waveform generated by the first magnetic sensor according to the periodic second magnetic attraction. When it is determined that the first waveform conforms to a predetermined waveform pattern, it controls the third switch to be in a periodic conducting state starting from the positive period of the first waveform.

8. The electronic device according to claim 6, characterized in that, When the first magnetic sensor detects that the first magnetic attraction force generated by the charging device is greater than the first magnetic threshold, the second control module controls the third switch to remain on, and then turns off the third switch after a first duration.

9. The electronic device according to claim 8, characterized in that, The third switch is a third metal-oxide-semiconductor transistor, the fourth switch is a fourth metal-oxide-semiconductor transistor, and the fourth switch is connected in parallel with the third switch; The second control module is used to control the fourth switch to open and the third switch to open according to the charging signal of the charging device; The second control module is also used to control the fourth switch to turn on after the third switch is turned off.

10. A charging system, characterized in that, It includes the charging device as claimed in any one of claims 1 to 5 and the electronic device as claimed in any one of claims 6 to 9.

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