A wireless charging protection method, device, equipment and medium

Abstract

This application relates to the technical field of wireless charging, and particularly to a wireless charging protection method, device, equipment and medium. This application first collects a reference current value to establish a reference standard when the wireless charging transmitter is in the off state, and then monitors the current change in real time when the wireless charging transmitter is in the on state. By calculating the current change rate and comparing it with a preset threshold, it can quickly determine whether there is an abnormality caused by a large metal foreign object. When an abnormality is detected, the system will immediately turn off the charging output to ensure safety, can effectively distinguish between large metal foreign objects and normal charging loads, respond in a timely manner, and improve the safety and reliability of the wireless charging system.

Description

Technical Field

[0001] This application relates to the technical field of wireless charging, and particularly to a wireless charging protection method, device, equipment and medium. Background Art

[0002] Wireless charging technology realizes power transmission through electromagnetic induction between the transmitter coil and the receiver coil, and has been widely used in fields such as smart phones, smart wearable devices, and electric vehicles due to its convenience. This technology can charge electronic devices without using a charging cable, greatly improving the user experience.

[0003] Existing wireless charging devices generally adopt a protection mechanism based on impedance detection, and judge whether there is an abnormality by monitoring the current and voltage parameters in the charging circuit. When an abnormality is detected, the system will automatically cut off the charging output to protect the safety of the device.

[0004] However, the existing protection mechanisms mainly target general faults such as circuit short - circuits and load abnormalities, and lack a dedicated detection and protection scheme for current abnormalities caused by the placement of metal foreign objects. This may cause the over - current protection of the lithium - battery protection chip to trigger, making the mobile power supply enter a power - off state, and it needs to be charged with an external adapter to be re - activated, which brings troubles to users. This situation needs to be further improved. Summary of the Invention

[0005] In order to solve the problem that the existing protection mechanism lacks dedicated detection for current abnormalities caused by the placement of metal foreign objects, this application provides a wireless charging protection method, device, equipment and medium, and adopts the following technical solutions:

[0006] In the first aspect, this application provides a wireless charging protection method, including the following steps:

[0007] Collect current data in the wireless charging off state to obtain a reference current value;

[0008] Turn on the wireless charging function and control the transmitting circuit to output an alternating magnetic field signal;

[0009] Based on the output state of the alternating magnetic field signal, collect current data during wireless charging operation to obtain a real - time current value;

[0010] Calculate the current change rate according to the reference current value and the real - time current value;

[0011] Compare the current change rate with a preset threshold range to determine whether there is an abnormal state caused by the placement of metal foreign objects;

[0012] When it is determined that there is an abnormal state, control the wireless charging module to turn off the output.

[0013] By adopting the above technical solution, since the existing wireless charging technology mainly relies on the threshold protection of single parameters such as temperature or voltage when detecting metal foreign objects, it is difficult to accurately identify the placement of large metal foreign objects. When a user accidentally places large metal items such as keys or coins in the wireless charging area, although the charging current will rise rapidly, the traditional protection scheme often misjudges it as a normal load change, resulting in continuous heating of the metal foreign object and posing a safety hazard. This application first collects the reference current value to establish a reference standard when the wireless charging transmitter is in the off state, and then monitors the current change in real time when the wireless charging transmitter is in the on state. By calculating the current change rate and comparing it with the preset threshold, it quickly determines whether there is an abnormality caused by a large metal foreign object. When an abnormality is detected, the system will immediately turn off the charging output to ensure safety, which can effectively distinguish large metal foreign objects from normal charging loads, respond in a timely manner, and improve the safety and reliability of the wireless charging system.

[0014] Optionally, during the process of controlling the transmitting circuit to output an alternating magnetic field signal, the method further includes the following steps:

[0015] Send a communication handshake signal that complies with the wireless charging standard;

[0016] Detect the response information of the communication handshake signal to obtain a communication detection result;

[0017] According to the communication detection result, determine whether the placed object is a wireless charging device that meets the standard;

[0018] If so, receive the power demand information sent by the standard wireless charging device and adjust the transmission power according to the power demand information;

[0019] If not, immediately stop the output of the transmitting circuit.

[0020] By adopting the above technical solution, this application first sends a communication handshake signal that complies with the wireless charging standard, and determines the identity of the placed object by detecting the response information. Only when it is confirmed as a standard charging device will it adjust the output power according to its power demand information, otherwise it will immediately stop the output. By introducing the communication handshake and identity recognition links, it can effectively prevent non-standard devices in the initial stage of charging and achieve intelligent power matching with standard devices, with accurate identification and rapid response, which can greatly improve the compatibility and safety of the wireless charging system.

[0021] Optionally, the preset threshold range includes a maximum change rate threshold and a minimum change rate threshold;

[0022] When the current change rate is greater than the maximum change rate threshold or less than the minimum change rate threshold, it is determined that there is an abnormal state.

[0023] By adopting the above technical solution, the system of the present application calculates the current change rate in real time, and makes a two-way comparison with the preset maximum and minimum change rate thresholds. When the change rate exceeds this safe range, an abnormal state can be determined; it can not only identify the sharp increase in current caused by large metal foreign objects, but also detect the sharp drop in current caused by abnormal charging.

[0024] Optionally, after controlling the wireless charging module to turn off the output, the method further includes the following steps:

[0025] Start a timer to count a preset waiting time, and the preset waiting time is used to judge the duration of the state without device placement;

[0026] When no device placement is detected within the preset waiting time, the control system enters the shutdown state;

[0027] When a device placement is detected within the preset waiting time, reset the timer and re-execute the step of collecting the current data when the wireless charging is in the off state.

[0028] By adopting the above technical solution, since the existing wireless charging system often lacks a reasonable recovery mechanism after detecting an abnormality and turning off the output, the user experience is affected; the system of the present application starts a timer after detecting the state without device placement, and presets a reasonable waiting time window. Within this time window, if no device placement is continuously detected, the system will automatically enter the shutdown state of deep energy saving; if a device placement is detected during this period, the timer will be reset in time and the current detection will be performed again to ensure the normal use of the charging function. Through an automated management method, a better user experience is provided.

[0029] Optionally, the method further includes the following steps:

[0030] Detect the power demand information of a standard wireless charging device and establish a normal charging power change range;

[0031] Continuously collect multiple groups of current data at preset time intervals and calculate whether the current change is within the normal charging power change range;

[0032] When it is detected that the current change exceeds the normal charging power change range, reduce the transmission power;

[0033] Continue to monitor the current change trend. If the power is still beyond the normal charging power change range after reducing the power, trigger a protection shutdown.

[0034] By adopting the above technical solution, since the existing wireless charging protection solution has a simple strategy and lacks flexible handling of slight abnormalities during the charging process, when the charging device causes current fluctuations due to a slight deviation in position or temporary interference, the system may immediately trigger protection shutdown, which not only affects the charging efficiency but also reduces the user experience. In this application, first, the normal change range is determined according to the power demand information of the standard charging device, and then multiple groups of current data are collected at fixed time intervals for continuous monitoring. When it is found that the current change exceeds the normal range, a gentle processing method of reducing power is preferentially adopted, and only when the power cannot be restored to normal after reducing the power is the full shutdown protection triggered. Hierarchical processing of charging abnormalities is realized, which not only ensures the continuity of charging but also maintains necessary safety protection, improving the practicality of the wireless charging system.

[0035] Optionally, after reducing the transmission power when it is detected that the current change exceeds the normal charging power change range, the method further includes the following steps:

[0036] Store the consecutive current data after reducing the power into the buffer area in chronological order, and calculate the change trend of the current data in the buffer area;

[0037] Monitor whether the standard wireless charging device sends a new power adjustment request;

[0038] If there is no power adjustment request and the current change trend is abnormal, further reduce the transmission power and shorten the sampling interval.

[0039] By adopting the above technical solution, since the existing wireless charging system lacks the ability to continuously track and intelligently analyze abnormal states during power adjustment, it often cannot accurately judge the effect of power adjustment. After the first power reduction in this application, the continuously collected current data is stored in the buffer area for trend analysis, and at the same time, the power adjustment request of the charging device is monitored. When it is found that there is no device request and the current change trend remains abnormal, a more aggressive protection strategy is automatically triggered, including further reducing the power and increasing the sampling frequency. Through the introduction of data cache analysis and multi-dimensional judgment, accurate identification and dynamic adjustment of charging abnormalities are realized, improving the safety and reliability of the wireless charging system.

[0040] Optionally, after further reducing the transmission power and shortening the sampling interval, the method further includes the following steps:

[0041] According to the power demand information of the standard wireless charging device, determine the normal current fluctuation range of the current charging stage;

[0042] Calculate whether the current fluctuation of the high-frequency sampling data is within the normal current fluctuation range;

[0043] When the current fluctuation continuously exceeds the normal current fluctuation range and the cumulative duration reaches a preset value, the charging output is immediately turned off.

[0044] By adopting the above technical solution, since the existing wireless charging system lacks an accurate determination standard for the final abnormal state after multi-level power adjustment, it is prone to the problem of inaccurate protection timing; for example, when the system reduces power multiple times, it is still difficult to accurately determine whether it is a temporary interference or a persistent abnormality, which may lead to overly slow or overly sensitive protection actions. This application first establishes a normal fluctuation range standard for the current charging stage based on the device power demand information, and then performs real-time analysis on the current data obtained by high-frequency sampling. When it is found that the current fluctuation continuously exceeds the normal range and the abnormal duration reaches a preset threshold, the final protection shutdown is triggered; this not only avoids overreacting to instantaneous interference but also can promptly handle persistent abnormalities, improving the overall protection level of the wireless charging system.

[0045] In a second aspect, the present application provides a wireless charging protection device, including:

[0046] A processor for controlling the working state of the wireless charging device;

[0047] An analog-to-digital conversion circuit connected to the processor for collecting current data of the wireless charging circuit;

[0048] A transmitting circuit connected to the processor for generating an alternating magnetic field signal;

[0049] A memory connected to the processor for storing a reference current value, a real-time current value, and a preset threshold range;

[0050] A control circuit connected to the processor for controlling the wireless charging module to turn off the output when an abnormal state caused by the placement of a metal foreign object is detected.

[0051] In a third aspect, the present application provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the steps of the above wireless charging protection method are implemented.

[0052] In a fourth aspect, the present application provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above wireless charging protection method are implemented.

[0053] In summary, the present application includes at least one of the following beneficial technical effects:

[0054] This application first collects the reference current value to establish a reference standard when the wireless charging transmitter is in the off state, and then monitors the current change in real time when the wireless charging transmitter is in the on state. By calculating the current change rate and comparing it with the preset threshold, it can quickly determine whether there is an abnormality caused by a large metal foreign object. When an abnormality is detected, the system will immediately turn off the charging output to ensure safety, and can effectively distinguish between large metal foreign objects and normal charging loads, respond in a timely manner, and improve the safety and reliability of the wireless charging system;

[0055] This application first sends a communication handshake signal that complies with the wireless charging standard, and judges the identity of the placed object by detecting the response information. Only when it is confirmed as a standard charging device will the output power be adjusted according to its power demand information, otherwise the output will be stopped immediately; By introducing the communication handshake and identity recognition links, non-standard devices can be effectively prevented at the initial stage of charging, and intelligent power matching with standard devices is achieved. The recognition is accurate and the response is fast, which can greatly improve the compatibility and safety of the wireless charging system;

[0056] Since the existing wireless charging protection scheme has a simple strategy and lacks flexible handling of minor abnormalities during the charging process, when the charging current fluctuates due to a slight position offset or temporary interference of the charging device, the system may immediately trigger protection and shut down, which not only affects the charging efficiency but also reduces the user experience; This application first determines the normal change range according to the power demand information of the standard charging device, and then continuously monitors by collecting multiple groups of current data at fixed time intervals. When it is found that the current change exceeds the normal range, a mild processing method of reducing the power is preferentially adopted, and only when the power cannot be restored to normal after reducing the power will the complete shutdown protection be triggered; It realizes the hierarchical processing of charging abnormalities, ensures the continuity of charging while maintaining necessary safety protection, and improves the practicality of the wireless charging system. Description of the Drawings

[0057] Figure 1 is a schematic flowchart of a wireless charging protection method according to an embodiment of this application;

[0058] Figure 2 is a schematic flowchart of step S120 in a wireless charging protection method according to an embodiment of this application;

[0059] Figure 3 is a schematic flowchart of timing the preset waiting time in a wireless charging protection method according to an embodiment of this application;

[0060] Figure 4 is a schematic flowchart of hierarchical processing in a wireless charging protection method according to an embodiment of this application;

[0061] Figure 5 is a schematic flowchart of data cache analysis in a wireless charging protection method according to an embodiment of this application;

[0062] Figure 6 It is a schematic flowchart for determining the current fluctuation range in a wireless charging protection method according to an embodiment of the present application;

[0063] Figure 7 It is a schematic diagram of modules of a wireless charging protection device according to an embodiment of the present application;

[0064] Figure 8 It is an internal structure diagram of an electronic device according to an embodiment of the present application. Detailed implementation manners

[0065] The terms used in the following embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. As used in the specification and appended claims of the present application, the singular forms "a", "an", "the", "above", "said", "this" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It should also be understood that the term "and / or" used in the present application refers to any or all possible combinations including one or more of the listed items.

[0066] Hereinafter, the terms "first" and "second" are only used for descriptive purposes, and cannot be construed as implying or suggesting relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0067] The following further describes the embodiments of the present application in conjunction with the accompanying drawings of the specification.

[0068] In a first aspect, the present application provides a wireless charging protection method. Referring to Figure 1 , the wireless charging protection method provided by the present application starts from the shutdown state of the mobile power supply. The system can be awakened into the working state through buttons or touch sensing, including the following steps:

[0069] S110. Collect the current data in the wireless charging off state to obtain a reference current value.

[0070] Among them, the reference current value refers to the system static working current when the wireless charging module has not been turned on after the system is awakened from the shutdown state. The reference current value is mainly composed of the working currents of basic circuits such as the MCU and the communication circuit, and is an important reference benchmark for subsequent foreign object detection and judgment.

[0071] In this embodiment, after the system is awakened, 10 groups of current data are continuously collected at 1 ms intervals by a high-precision current sensor using a 12-bit ADC. After removing the maximum and minimum values and taking the average, the system reference current value is obtained. In practice, this reference current value generally fluctuates within the range of 20 - 60 mA. If it exceeds this range, it is considered that the system may be abnormal. The high-precision current sensor can be set at the transmitting end or its periphery, and can monitor the induced current generated under this alternating magnetic field. It can be understood that the specific sampling frequency and reference current value can be adjusted according to actual conditions.

[0072] S120. Turn on the wireless charging function and control the transmitting circuit to output an alternating magnetic field signal.

[0073] Among them, the wireless charging transmitting end starts in a low-power pre-detection mode, and detects whether there is an object in the charging area by emitting a weak alternating magnetic field. This pre-detection mode can effectively avoid the safety hazards brought by high-power startup.

[0074] In this embodiment, the system first limits the transmitting power within 2W and generates an alternating magnetic field signal through an LC resonant circuit. The transmitting circuit uses PWM modulation to control the output power to ensure the safety and reliability of the detection process.

[0075] S130. Based on the output state of the alternating magnetic field signal, collect the current data during wireless charging to obtain the real-time current value.

[0076] Among them, the real-time current value reflects whether there is an object in the charging area and the nature of the object. By monitoring the change of the input current of the system in real time through a high-precision current sensor, different states such as no-load, normal load, and foreign object load can be effectively distinguished.

[0077] In this embodiment, the system collects the current data of the transmitting circuit during operation through a current sensor. The sampling frequency is set to 1 kHz, and each collection lasts for 2 ms. After obtaining 10 groups of data, the real-time current value is obtained through digital filtering processing. To ensure data reliability, the system will continuously collect 3 groups of real-time current values for comparison and verification.

[0078] S140. Calculate the current change rate according to the reference current value and the real-time current value.

[0079] Among them, the current change rate is used to quantify the degree of change of the system load state. By comparing the difference between the real-time current and the reference current, it can quickly judge whether there is a foreign object in the charging area.

[0080] In this embodiment, the system uses the calculation formula of (real-time current value - reference current value) / reference current value to obtain the current change rate. Or, the current change rate can also be directly the real-time current value - reference current value.

[0081] S150. Compare the current change rate with a preset threshold range to determine whether there is an abnormal state caused by the placement of a metal foreign object.

[0082] Among them, the preset threshold range includes a maximum change rate threshold and a minimum change rate threshold; when the current change rate is greater than the maximum change rate threshold or less than the minimum change rate threshold, it is determined that there is an abnormal state.

[0083] In this embodiment, the system sets a safe threshold range for the current change rate based on a large amount of experimental data. When the detected current change rate exceeds the preset range, it indicates that there may be a metal foreign object in the charging area, and protection measures need to be taken in a timely manner.

[0084] S160. When it is determined that there is an abnormal state, control the wireless charging module to turn off the output.

[0085] Among them, once it is confirmed that there is an abnormal state, the system needs to quickly cut off the power transmission to prevent potential safety hazards caused by overcurrent. After turning off, the system will wait for a predetermined time and then try to start again to achieve intelligent protection.

[0086] In this embodiment, the system adopts a fast turn-off strategy. First, it turns off the PWM drive signal, and then cuts off the bias power supply of the power tube to ensure that the charging circuit is completely turned off within 5 ms. After turning off, the system enters a waiting state, and the default waiting time is set to 5 s, and then it re-enters the detection process.

[0087] In one embodiment, referring to Figure 2 , after completing the basic current anomaly detection, this embodiment further improves the detection accuracy. In step S120, when controlling the transmission circuit to output an alternating magnetic field signal, the method further includes the following steps:

[0088] S210. Send a communication handshake signal that complies with the wireless charging standard.

[0089] In this embodiment, after the transmission circuit operates stably, the system generates a digital communication signal by modulating the transmission power. These signals need to strictly follow the communication specifications of mainstream wireless charging protocols such as Qi, and include basic information such as device identification codes and communication version numbers.

[0090] Specifically, the resonant circuit at the receiving end generates an induced alternating current, which is then converted into direct current through a full bridge to provide power for the receiving end. At the same time, the receiving end can send signals to the transmitting end by changing the load size, etc. Regular devices that support wireless charging, such as mobile phones or headphones, follow specific wireless charging communication protocols (such as the Qi standard, etc.) in their hardware design.

[0091] S220. Detect the response information of the communication handshake signal to obtain a communication detection result.

[0092] Among them, in this embodiment, the system continuously monitors the response signals of devices in the charging area through a dedicated demodulation circuit. Standard wireless charging devices will return response data containing key parameters such as device type and power level according to the protocol specifications.

[0093] In this embodiment, the demodulation circuit uses envelope detection to extract digital signals, and the sampling frequency is set to 40 kHz. The system performs digital filtering and Manchester decoding on the sampled data to extract the complete response data packet. For example, each communication process continuously monitors for 250 ms. If no valid data can be decoded during this period, the communication is considered to have failed.

[0094] S230. According to the communication detection result, determine whether the placed object is a standard-compliant wireless charging device.

[0095] In this embodiment, the system needs to perform protocol parsing and validity verification on the received response data. The system checks whether keyword fields such as device identification and protocol version in the response data packet conform to the standard specifications.

[0096] Specifically, the verification process first checks whether the checksum of the data packet is correct, and then verifies whether the device identification code matches the preset valid value range. Further, the system also compares whether the protocol version numbers are compatible. Only when all verification items pass can it be confirmed as a legal charging device. And the timeout for the verification process can be set. For example, the timeout for the verification process is set to 150 ms.

[0097] If so, execute step S240. Receive the power demand information sent by the standard wireless charging device, and adjust the transmission power according to the power demand information.

[0098] In this embodiment, after confirming the device's legality, the system starts to receive the charging parameter configuration requests sent by the device. These requests contain the charging voltage and current values expected by the device, and the system needs to dynamically adjust the output power accordingly.

[0099] Specifically, a closed-loop control method is adopted to accurately control the output power by adjusting the duty cycle and switching frequency of the PWM waveform in real time, ensuring the stability and safety of the charging process.

[0100] If not, execute step S250. Immediately stop the output of the transmitting circuit.

[0101] In this embodiment, when the system detects communication anomalies or the device is illegal, it needs to immediately cut off the energy transmission to prevent safety hazards such as metal foreign objects from heating up.

[0102] In one embodiment, referring to Figure 3 , step S160, after controlling the wireless charging module to turn off the output, the method further includes the following steps:

[0103] S310. Start a timer to measure a preset waiting time, which is used to determine the duration of the no-device placement state.

[0104] Among them, the system configures and starts a low-power timer module to monitor the duration of the no-device state.

[0105] In this embodiment, the system sets the preset waiting time to 5 seconds. During the timing process, the system can use the LED indicator to flash at a low frequency to indicate the current standby state, and at the same time place non-essential peripheral circuits such as high-speed clocks and communication interfaces in the sleep mode to reduce the system operating current to below 5 mA.

[0106] S320. When no device placement is detected within the preset waiting time, the control system enters the shutdown state.

[0107] In this embodiment, when the timer reaches the preset 5 seconds and no device placement is detected during this period, the system will execute the automatic shutdown process. This process includes closing all non-essential function modules, configuring the wake-up source, and finally putting the system into the deep sleep mode.

[0108] S330. When a device placement is detected within the preset waiting time, reset the timer and re-execute the step of collecting the current data when the wireless charging is in the off state.

[0109] Among them, the system maintains the most basic device detection function during the waiting period. When a possible device placement is detected, immediately reset the timer count value and re-enter the complete device detection process to ensure the timely response of the charging function.

[0110] In this embodiment, the system monitors the charging area status through a light-load detection circuit, and sets the sampling frequency to 10 Hz to reduce power consumption. When a load change is detected, first reset the count value of the 5-second timer to restore the normal working state of the system, including starting the high-speed clock and enabling the ADC module.

[0111] In one embodiment, referring to Figure 4 , the method further includes the following steps:

[0112] S410. Detect the power requirement information of a standard wireless charging device and establish a normal charging power change range.

[0113] In this embodiment, the system identifies the device type by detecting the load modulation signal during the wireless charging process. When a standard wireless charging device is detected, determine the charging ability level of the device according to its characteristic current and power change mode, and establish the corresponding power change monitoring range.

[0114] Specifically, the system first identifies the device type through a low-power detection signal, then determines its charging power level based on the impedance change characteristics of the device, and sets the corresponding power fluctuation threshold.

[0115] S420. Continuously collect multiple groups of current data at preset time intervals and calculate whether the current change is within the normal charging power change range.

[0116] In this embodiment, the system adopts a sampling method with a fixed time interval to continuously monitor the current change during the charging process. Through the collection and analysis of multiple consecutive groups of data, the abnormal state during the charging process can be accurately identified.

[0117] Specifically, the system samples once every 100 ms, continuously collects 10 groups of data each time and calculates the average value to effectively filter out the interference of instantaneous fluctuations. The collected data is analyzed in real time. When it is found that the calculation results of three consecutive samplings exceed the preset power change range, the power adjustment protection strategy is triggered.

[0118] S430. When it is detected that the current change exceeds the normal charging power change range, reduce the transmission power.

[0119] In this embodiment, the system adopts a hierarchical protection strategy. First, it tries to solve the abnormal situation by reducing the transmission power to avoid directly cutting off the output and affecting the user experience.

[0120] Specifically, when power abnormality is detected, the system reduces the transmission power to 75% of the current value and re-monitors the status at the new power level. The power adjustment process adopts a gradual change method to ensure the smoothness of the charging process and avoid the negative impact that may be brought by power mutation. For example, in the normal charging state, the power fluctuation range is between 12W and 18W. When it is detected that a metal foreign object approaches the charging area, due to the eddy current loss of the metal object, the actual power may suddenly increase. After the system detects this abnormality, it first reduces the output power. If the metal foreign object is still not removed at this time and the actual power measured at the new power level still exceeds the safety range, the system determines that there is a potential safety hazard and immediately executes the protection shutdown. Through this, it will not directly shut down due to temporary interference, reducing the probability of false protection and allowing small-power charging to continue in some slightly abnormal situations.

[0121] S440. Continue to monitor the current change trend. If the power is still outside the normal charging power change range after reducing the power, trigger the protection shutdown.

[0122] In this embodiment, the system will continuously monitor the charging status after power adjustment to evaluate the effect of the power reduction measure. If the abnormal state persists after reducing the power, it is determined to be a serious abnormality and a complete protection shutdown needs to be executed.

[0123] In one embodiment, referring to Figure 5 step S430, when it is detected that the current change exceeds the normal charging power change range and after reducing the transmission power, the method further includes the following steps:

[0124] S510. Store the consecutive current data after reducing the power into the buffer area in chronological order, and calculate the change trend of the current data in the buffer area.

[0125] In this embodiment, the system establishes a circular storage data buffer area for recording the change of the charging state after power adjustment. By performing trend analysis on the buffered data, the effect of power adjustment is evaluated in real time, providing a decision basis for subsequent control strategies.

[0126] Specifically, the system sets up a circular buffer area with a capacity of 50 groups of data. Each group of data includes the sampling timestamp and the corresponding current value. The least squares method is used to perform linear fitting on the latest 20 groups of data to calculate the slope of the current change. If the slope exceeds the preset threshold (such as a change rate exceeding 5% per second), it is determined as an abnormal trend. At the same time, the system also calculates the fluctuation variance of the data to evaluate the stability of the charging state.

[0127] S520. Monitor whether the standard wireless charging device sends a new power adjustment request.

[0128] In this embodiment, the system identifies whether there is a new power demand by monitoring the load modulation signal at the device end. This monitoring mechanism can distinguish whether the power change is due to the normal demand of the device or an abnormal situation.

[0129] Specifically, within 5 seconds after reducing the power, the system focuses on the impedance modulation characteristics of the device. If a power adjustment signal sequence conforming to the standard protocol is detected, it indicates that the power change is a normal behavior actively requested by the device. At this time, the system will appropriately adjust the power according to the device request. On the contrary, if no standard modulation signal is detected and the power still shows abnormal changes, further protection measures are required.

[0130] S530. If there is no power adjustment request and the current change trend is abnormal, further reduce the transmission power and shorten the sampling interval.

[0131] In this embodiment, the system adopts a more aggressive power adjustment strategy to quickly respond to potential abnormal situations by reducing the power level and increasing the monitoring frequency. For example, when the user's key is slowly sliding into the charging area. At this time, the charging abnormality will develop progressively. The traditional solution may wait until the power reaches the dangerous threshold before cutting off, which poses a safety hazard. For example, the initial charging power is 15W. As the key gradually approaches, the power starts to rise slowly. When the power rises to 18W, this solution will trigger the first-level protection and drop to 11.25W. The system analyzes the data in the buffer area and finds that the current is still rising continuously (the slope is positive and exceeds 5% / s). Since no power adjustment request from the device is received, the system determines it as an abnormal situation, further reduces the power to 6.75W, and encrypts the sampling monitoring. Or, during the charging process, the charging device shakes slightly, resulting in fluctuations in the charging efficiency. The charging power that was originally stable at 15W suddenly drops to 11W due to the shake. The traditional solution may misjudge the power fluctuation as abnormal and trigger protection. In this solution, the device will request to increase the power through load modulation to maintain the charging efficiency. The system detects the standard power adjustment request signal, verifies that it belongs to the normal power adjustment requirement, and maintains the normal charging state. Or when the charger is placed in direct sunlight and the ambient temperature gradually rises, misjudgments may occur in all cases. This application anticipates in advance through the fluctuation characteristics to achieve preventive protection.

[0132] In one embodiment, referring to Figure 6 , after step S530 of further reducing the transmission power and shortening the sampling interval, the method further includes the following steps:

[0133] S610. Determine the normal current fluctuation range of the current charging stage according to the power demand information of the standard wireless charging device.

[0134] In this embodiment, the system dynamically adjusts the judgment criteria for current fluctuations according to the characteristics of different stages of the charging process. Since the current characteristics in different charging stages are significantly different, adopting staged judgment criteria can improve the accuracy of abnormal detection.

[0135] S620. Calculate whether the current fluctuation of the high-frequency sampling data is within the normal current fluctuation range.

[0136] In this embodiment, the system adopts a method combining high-frequency sampling and statistical analysis to monitor the fluctuation of the charging current in real time. By statistically processing the sampling data, the influence of random interference can be effectively reduced, and the reliability of the judgment can be improved.

[0137] S630. When the current fluctuation continuously exceeds the normal current fluctuation range and the cumulative duration reaches the preset value, immediately turn off the charging output.

[0138] In this embodiment, the system determines whether to trigger full protection by accumulating the duration of abnormal fluctuations. This time-accumulation-based judgment mechanism can avoid false triggers caused by instantaneous interference and can respond to persistent abnormal conditions in a timely manner.

[0139] It should be understood that the magnitudes of the sequence numbers of the steps in the above embodiments do not mean the order of execution. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0140] In a second aspect, the present application provides a wireless charging protection device. The wireless charging protection device of the present application will be described below in combination with the above wireless charging protection method.

[0141] Referring to Figure 7 , a wireless charging protection device includes:

[0142] A processor for controlling the working state of the wireless charging device;

[0143] An analog-to-digital conversion circuit connected to the processor for collecting current data of the wireless charging circuit;

[0144] A transmitting circuit connected to the processor for generating an alternating magnetic field signal;

[0145] A memory connected to the processor for storing a reference current value, a real-time current value, and a preset threshold range;

[0146] A control circuit connected to the processor for controlling the wireless charging module to turn off the output when an abnormal state caused by the placement of a metal foreign object is detected.

[0147] In one embodiment, the present application provides an electronic device, which may be a server, and its internal structure diagram may be as Figure 8 shown. The electronic device includes a processor, a memory, and a network interface connected through a system bus. Among them, the processor of the electronic device is used to provide computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the electronic device is used to store data. The network interface of the electronic device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a wireless charging protection method is implemented.

[0148] Those skilled in the art can understand, Figure 8The structure shown is only a block diagram of some of the structures related to the solution of this application, and does not constitute a limitation on the electronic device to which the solution of this application is applied. The specific electronic device may include more or fewer components than those shown in the figure, or combine some components, or have a different component arrangement.

[0149] In one embodiment, an electronic device is further provided, including a memory and a processor. A computer program is stored in the memory, and when the processor executes the computer program, the steps in the above method embodiments are implemented.

[0150] Those of ordinary skill in the art can understand that all or part of the processes in the above method embodiments can be completed by instructing relevant hardware through a computer program. The above computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the above method embodiments. Among them, any reference to a memory, storage, database, or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memories. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, or optical memory, etc. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0151] The above are all the preferred embodiments of this application. Without limiting the protection scope of this application accordingly, therefore: Any equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A wireless charging protection method, characterized in that: The steps include: Collect current data when wireless charging is turned off to obtain a reference current value; Turn on the wireless charging function and control the transmitting circuit to output an alternating magnetic field signal; Based on the output state of the alternating magnetic field signal, current data during wireless charging operation is collected to obtain a real-time current value; Calculating a current change rate according to the reference current value and the real-time current value; Comparing the current change rate with a preset threshold range to determine whether there is an abnormal state caused by the placement of a metal foreign object; When it is determined that an abnormal state exists, the wireless charging module is controlled to turn off the output; In the process of controlling the transmitting circuit to output the alternating magnetic field signal, the method further includes the following steps: Send communication handshake signals that comply with wireless charging standards; Detecting response information of the communication handshake signal to obtain a communication detection result; According to the communication detection result, determining whether the placed object is a wireless charging device that complies with the standards; If yes, receiving the power requirement information sent by the standard wireless charging device, and adjusting the transmission power according to the power requirement information; If not, the transmitting circuit output is stopped immediately; The method further comprises the following steps: Detect the power demand information of standard wireless charging devices and establish the normal charging power variation range; Continuously collecting multiple sets of current data at preset time intervals, and calculating whether the current change is within the normal charging power change range; When it is detected that the current variation exceeds the normal charging power variation range, reducing the transmission power; The continuous current data after power reduction is stored in a buffer area in chronological order, and the change trend of the current data in the buffer area is calculated; Monitor whether the standard wireless charging device sends a new power adjustment request; If there is no power adjustment request and the current change trend is abnormal, the transmit power is further reduced and the sampling interval is shortened; Continue to monitor the current change trend. If the current still exceeds the normal charging power change range after reducing the power, the protection shutdown is triggered.

2. The wireless charging protection method according to claim 1, characterized in that: The preset threshold range includes a maximum change rate threshold and a minimum change rate threshold; When the current change rate is greater than the maximum change rate threshold or less than the minimum change rate threshold, it is determined that an abnormal state exists.

3. The wireless charging protection method according to claim 1, characterized in that: After controlling the wireless charging module to turn off the output, the method further includes the following steps: Starting a timer to count a preset waiting time, wherein the preset waiting time is used to determine the duration of a state where no device is placed; When the placement of the device is not detected within the preset waiting time, the control system enters a shutdown state; When the placement of the device is detected within the preset waiting time, the timer is reset and the step of collecting current data when the wireless charging is turned off is re-executed.

4. The wireless charging protection method according to claim 1, characterized in that: After further reducing the transmission power and shortening the sampling interval, the method further includes the following steps: Determine the normal current fluctuation range in the current charging stage based on the power demand information of the standard wireless charging device; Calculate whether the current fluctuation of the high-frequency sampling data is within the normal current fluctuation range; When the current fluctuation continues to exceed the normal current fluctuation range and the accumulated duration reaches a preset value, the charging output is immediately turned off.

5. A wireless charging protection device, characterized in that: include: A processor, used to control the working state of the wireless charging device; an analog-to-digital conversion circuit, connected to the processor, and used to collect current data of the wireless charging circuit; A transmitting circuit, connected to the processor, for generating an alternating magnetic field signal; A memory, connected to the processor, for storing a reference current value, a real-time current value, and a preset threshold range; A control circuit, connected to the processor, for controlling the wireless charging module to shut down output when an abnormal state caused by the placement of a metal foreign object is detected; The processor further performs the following steps: Send communication handshake signals that comply with wireless charging standards; Detecting response information of the communication handshake signal to obtain a communication detection result; According to the communication detection result, determining whether the placed object is a wireless charging device that complies with the standards; If yes, receiving the power requirement information sent by the standard wireless charging device, and adjusting the transmission power according to the power requirement information; If not, the transmitting circuit output is stopped immediately; Detect the power demand information of standard wireless charging devices and establish the normal charging power variation range; Continuously collecting multiple sets of current data at preset time intervals, and calculating whether the current change is within the normal charging power change range; When it is detected that the current variation exceeds the normal charging power variation range, reducing the transmission power; The continuous current data after power reduction is stored in a buffer area in chronological order, and the change trend of the current data in the buffer area is calculated; Monitor whether the standard wireless charging device sends a new power adjustment request; If there is no power adjustment request and the current change trend is abnormal, the transmit power is further reduced and the sampling interval is shortened; Continue to monitor the current change trend. If the current still exceeds the normal charging power change range after reducing the power, the protection shutdown is triggered.

6. An electronic device, characterized in that: The invention comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the wireless charging protection method according to any one of claims 1 to 4 are implemented.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the wireless charging protection method according to any one of claims 1 to 4 are implemented.

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