Wireless charging foreign matter detection method and device, vehicle and product

Abstract

The invention relates to a foreign matter detection method and device for wireless charging, a vehicle and a product, and relates to the technical field of vehicles. According to the method, the signal following degree between the transmitting power of the charging device and the receiving power of the charging object is firstly obtained, and then whether the foreign matter influencing normal charging exists in the charging area of the charging device or not is detected according to the signal following degree. Wherein the signal following degree can represent the matching degree of the change of the transmitting power and the change of the receiving power, so that foreign matter detection can be carried out without depending on a single power difference value between the transmitting power and the receiving power, and the accuracy and stability of foreign matter detection in the wireless charging process can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of vehicles, and particularly to a foreign object detection method, device, vehicle, computer-readable storage medium, and computer program product for wireless charging. Background Art

[0002] With the rapid development of wireless charging technology, a technology for integrating foreign object detection during wireless charging can be applied to the application scenario of in-vehicle charging. A common existing foreign object detection method mainly determines whether there is a foreign object in the charging area by detecting the single power difference between the transmit power (TX, Transmit Power) of the charging device and the receive power (RX, Receive Power) of the charging object. When the detected power difference exceeds a preset range, it is determined that there is a foreign object and charging is stopped to ensure safety.

[0003] However, both the transmit power and the receive power are vulnerable to factors such as coil coupling degree, instantaneous power fluctuation, and change in the position of the charging object. Detecting only the power difference between the two will result in false alarms or missed alarms in the foreign object detection result, making the accuracy and stability of the existing foreign object detection for wireless charging relatively low. Summary of the Invention

[0004] An embodiment of the present application provides a foreign object detection method for wireless charging, which improves the accuracy and stability of foreign object detection for wireless charging to solve the above technical problems.

[0005] To achieve the above object, according to the first aspect of the present application, there is provided a foreign object detection method for wireless charging, the method comprising: <> <>

[0006] Obtaining a signal following degree between the transmit power of a charging device and the receive power of a charging object; the signal following degree represents the matching degree between the change in the transmit power and the change in the receive power; <> <>

[0007] Detecting whether there is a foreign object affecting normal charging in the charging area of the charging device according to the signal following degree. <> <>

[0008] Optionally, the obtaining a signal following degree between the transmit power of a charging device and the receive power of a charging object includes: <> <>

[0009] Obtaining a first change rate of the transmit power and a second change rate of the receive power within a preset time period; <> <>

[0010] Determining the signal following degree between the transmit power and the receive power according to the first change rate and the second change rate. <> <>

[0011] Optionally, obtaining the first change rate of the transmission power and the second change rate of the reception power within the preset time period includes:

[0012] Obtaining a transmission power difference based on the difference between the transmission power at the first moment and the transmission power at the second moment within the preset time period;

[0013] Obtaining a reception power difference based on the difference between the reception power at the first moment and the reception power at the second moment;

[0014] Taking the ratio of the transmission power difference to the time interval between the first moment and the second moment as the first change rate, and taking the ratio of the reception power difference to the time interval as the second change rate.

[0015] Optionally, determining the signal tracking degree between the transmission power and the reception power based on the first change rate and the second change rate includes:

[0016] Determining the difference between the first change rate and the second change rate as the signal tracking degree.

[0017] Optionally, detecting whether there is a foreign object affecting normal charging in the charging area of the charging device based on the signal tracking degree includes:

[0018] Detecting whether a first signal tracking degree between the transmission power of the charging device and the reception power of the charging object within a first preset time period is greater than a first threshold. If the first signal tracking degree is less than or equal to the first threshold, it is determined that there is no such foreign object in the charging area;

[0019] If the first signal tracking degree is greater than the first threshold, obtaining multiple second signal tracking degrees between the transmission power of the charging device and the reception power of the charging object within multiple consecutive second preset time periods after the first preset time period;

[0020] Detecting whether the multiple second signal tracking degrees meet a preset condition. If the preset condition is met, it is determined that there is such a foreign object in the charging area; if the preset condition is not met, it is determined that there is no such foreign object in the charging area.

[0021] Optionally, detecting whether the multiple second signal tracking degrees meet the preset condition includes:

[0022] Determining the number of third signal tracking degrees greater than a second threshold among the multiple second signal tracking degrees. If the number of the third signal tracking degrees is greater than a third threshold, it indicates that the multiple second signal tracking degrees meet the preset condition;

[0023] If the number of the third signal follow - up degrees is less than or equal to the third threshold, it indicates that the multiple second signal follow - up degrees do not meet the preset condition.

[0024] Optionally, the method further includes:

[0025] Obtain a first quality parameter value of the coil of the charging device before performing a charging operation;

[0026] When it is detected that the foreign object exists in the charging area, suspend the charging operation of the charging device for the charging object, and obtain a second quality parameter value of the coil of the charging device;

[0027] Verify the detection result of detecting the foreign object in the charging area according to the first quality parameter value and the second quality parameter value.

[0028] Optionally, the verifying the detection result of detecting the foreign object in the charging area according to the first quality parameter value and the second quality parameter value includes:

[0029] If the second quality parameter value is less than a fourth threshold, or the difference between the first quality parameter value and the second quality parameter value is greater than a fifth threshold, determine that the verification result is that the foreign object exists in the charging area;

[0030] If the second quality parameter value is greater than or equal to the fourth threshold, and the difference between the first quality parameter value and the second quality parameter value is less than or equal to the fifth threshold, determine that the verification result is that the foreign object does not exist in the charging area.

[0031] Optionally, the method further includes:

[0032] Obtain a signal response duration between the transmission power and the reception power during the detection process;

[0033] Adjust the magnitudes of the first threshold and / or the second threshold according to the signal response duration.

[0034] Optionally, the adjusting the magnitudes of the first threshold and / or the second threshold according to the signal response duration includes:

[0035] When the signal response duration is greater than a preset duration, decrease the first threshold and / or increase the magnitude of the second threshold;

[0036] When the signal response duration is less than or equal to the preset duration, increase the first threshold and / or decrease the magnitude of the second threshold.

[0037] Optionally, the method further includes:

[0038] Obtain the coupling degree between the charging object and the charging device;

[0039] If the coupling degree is less than the sixth threshold, then reduce the upper limit value of the transmission power.

[0040] According to a second aspect of the present application, there is also provided a computer-readable storage medium, in which program instructions are stored, and when the program instructions are executed, the method described above is implemented.

[0041] According to a third aspect of the present application, there is also provided a computer program product, the computer program product includes program instructions, and when the program instructions are executed by a processor, the method described above is implemented.

[0042] According to a fourth aspect of the present application, there is also provided an electronic device for executing the method described above.

[0043] According to a fifth aspect of the present application, there is also provided a vehicle, including the electronic device described above, or, executing the method described above.

[0044] In summary, in the embodiment of the present application, the signal following degree between the transmission power of the charging device and the receiving power of the charging object is first obtained, and then whether there is a foreign object affecting normal charging in the charging area of the charging device is detected according to the signal following degree. Among them, the signal following degree can represent the matching degree between the change in transmission power and the change in receiving power. Therefore, the method of the present application does not rely on the single power difference between the transmission power and the receiving power for foreign object detection, but obtains the changes of the two powers through multiple transmission powers and multiple receiving powers, and then detects the foreign object in the charging area of the charging device according to the matching degree between the change in transmission power and the change in receiving power, so as to be able to reduce the influence of the change in coupling degree, power instantaneous fluctuation and the change in the position of the charging object on the transmission power and the receiving power, and further improve the accuracy and stability of foreign object detection during wireless charging.

[0045] Other features and advantages of the present application will be described in detail in the subsequent specific implementation part. Description of the Drawings

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative efforts.

[0047] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, where the same reference numerals represent the same parts in the following description.

[0048] Figure 1 is one of the flow diagrams of a foreign object detection method for wireless charging provided in an exemplary embodiment of the present application;

[0049] Figure 2 is the second of the flow diagrams of a foreign object detection method for wireless charging provided in an exemplary embodiment of the present application;

[0050] Figure 3 is the generated power graph and the received power curve graph provided in an exemplary embodiment of the present application;

[0051] Figure 4 is a block diagram of an electronic device provided in an exemplary embodiment of the present application;

[0052] Figure 5 is a block diagram of a vehicle provided in an exemplary embodiment of the present application. Detailed implementation manners

[0053] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present application.

[0054] Nowadays, with the rapid development of wireless charging technology, it has been widely used in fields such as consumer electronic devices (such as smart phones, smart watches, etc.) and electric vehicles. Wireless charging technology uses electromagnetic induction, magnetic resonance, or other wireless energy transfer technologies to enable devices to obtain electrical energy without physical contact. Although this charging method is convenient and reduces the wear of physical interfaces, it also introduces new technical challenges, such as in the aspect of foreign object detection.

[0055] One of the main safety issues during wireless charging is the interference of metal foreign objects. For example, when foreign objects such as coins, keys, and metal fragments enter the charging area, these metal objects may interact with the electromagnetic field of the charger, resulting in a decrease in energy transfer efficiency and local overheating. In extreme cases, this overheating may cause device damage or even trigger a fire, seriously threatening user safety. Therefore, reliable foreign object detection technology is crucial for ensuring the safety of the wireless charging process.

[0056] Some existing foreign object detection technologies for wireless charging usually rely on monitoring the power difference between the transmitted power (TX) and the received power (RX). When the detected power difference exceeds a preset fixed threshold, the foreign object detection system (hereinafter referred to as "the system") can determine that there is a foreign object and stop charging to prevent overheating. However, this method has many defects. For example, the changes in the transmitted power, the received power, and the power difference between the two may be affected by multiple factors, including the coupling degree of the coil, the instantaneous power fluctuation, the relative position of the device, and the changes in the external environment, etc. These factors easily lead to misjudgment or missed judgment of the system, thus unable to accurately distinguish normal power fluctuations from foreign object interference. Secondly, using a fixed threshold for detection is not flexible enough to cope with different charging environments and cannot adapt to complex situations such as device movement and environmental changes, resulting in insufficient detection accuracy and system robustness. In addition, in the existing technology during the power transmission stage, the adjustment of the transmitted power mainly depends on the requirements of the receiving end. If the system still outputs high power in an area with poor coupling degree, it will increase the risk of overheating.

[0057] Based on the above problems, the present application provides a foreign object detection method for wireless charging. First, obtain the signal followability between the transmitted power of the charging device and the received power of the charging object, and then detect whether there is a foreign object affecting normal charging in the charging area of the charging device according to the signal followability. Since the signal followability represents the matching degree between the change in the transmitted power and the change in the received power, the present application does not rely on a single power difference between the transmitted power and the received power for foreign object detection. Instead, it obtains the changes in the two powers through multiple transmitted powers and multiple received powers, and then detects foreign objects in the charging area of the charging device according to the matching degree between the change in the transmitted power and the change in the received power. Therefore, it can reduce the influence of changes in the coupling degree, instantaneous power fluctuation, and the position change of the charging object on the transmitted power and the received power, and further improve the accuracy and stability of foreign object detection during wireless charging.

[0058] The following will illustrate the present application with specific embodiments.

[0059] Figure 2 is a schematic diagram of a foreign object detection method for wireless charging provided by an embodiment of the present application. As Figure 2 shown, the method may include the following steps 101-102, specifically as follows:

[0060] Step 101: Obtain the signal followability between the transmitted power of the charging device and the received power of the charging object.

[0061] Among them, the signal followability represents the matching degree between the change in transmission power and the change in reception power. Therefore, the smaller the gap between the change in transmission power and the change in reception power, the more matched they are, the higher the matching degree, and the higher the signal followability between them. The signal followability can be represented by a numerical value. Usually, the signal followability can be determined according to the ratio or difference between the change in transmission power and the change in reception power. Taking the calculated ratio or difference as the numerical value of the signal followability, it can be understood that the closer the ratio between the change in transmission power and the change in reception power is to 1, or the smaller the difference between the change in transmission power and the change in reception power, the higher the matching degree between them, and thus the higher the signal followability between them. A high signal followability also indicates a higher transmission efficiency of the wireless charging system, less loss during the energy transmission process, and a stable and safe charging process.

[0062] It should be noted that in practical applications, when calculating the signal followability using the ratio between the change in transmission power and the change in reception power, since the change in reception power is usually smaller than the change in transmission power, the calculated signal followability is usually a value less than 1. Therefore, considering factors such as experimental data and industry standards, the determination threshold can usually be set to 0.7, or any value between 0.7 and 1, so that when the signal followability is less than 0.7, it can be determined that the matching degree between the change in transmission power and the change in reception power is poor, and there may be foreign objects in the current charging area. When calculating the signal followability using the difference between the two, also considering factors such as experimental data and industry standards, the determination threshold can usually be set to 30% of the larger value among the change value of the transmission power and the change value of the reception power, so as to ensure that the judgment standard for the level of the signal followability depends on whether the difference between the change value of the reception power and the change value of the transmission power is greater than 30%. For example, if the larger value of the two power change values is 10, the determination threshold can be set to 3. When the difference between the transmission power and the reception power, that is, the signal followability between the two, is greater than 3, it can be determined that there may be foreign objects in the current charging area.

[0063] It should also be noted that since the coil coupling degree between the charging device and the charging object will have a certain impact on the transmission power and the reception power, in order to improve the flexibility and accuracy of foreign object detection, the coil coupling degree can also be divided into multiple levels according to the size of the numerical range, and corresponding signal followability determination thresholds are formulated for different levels of coil coupling degrees. For example, the smaller the coil coupling degree, the lower the judgment threshold of the signal followability calculated by the ratio of the two powers can be set, and the higher the judgment threshold of the signal followability calculated by the difference of the two powers can be set, so as to adaptively reduce the strictness of foreign object detection for charging scenarios with a lower coil coupling degree. The specific numerical values of the signal followability determination thresholds for each level can be comprehensively considered and set according to the accuracy requirements of foreign object detection and industry standards, and this embodiment does not limit this.

[0064] Specifically, when the transmitter adjusts the transmission power of its output, the receiver should correspondingly reflect the change in the received power. For example, when the transmitter increases the transmission power, under normal operating conditions, the receiver should increase the received power synchronously with the adjustment trend of the increasing transmission power, so that the change in the received power matches the change in the transmission power. If the received power can follow the change in the transmission power in a timely and accurate manner, such as in the aforementioned example where the transmission power and the received power increase synchronously, and further calculate that the ratio between the two is close to 1 or the difference is small, it indicates a high signal following degree; if the change in the received power lags or is inconsistent with the change in the transmission power, such as the direction and amplitude of the change in the transmission power being inconsistent with the change in the received power, and calculate that the ratio between the two is far from 1 or the difference is large, it indicates a low signal following degree.

[0065] Under ideal wireless charging conditions, the changes between the transmission power and the received power should be synchronous and matched. For example, when the transmitter increases the transmission power, the receiver should also correspondingly receive more received power, and vice versa. Under normal circumstances, the more synchronous the change in the transmission power and the received power, the higher the corresponding signal following degree.

[0066] To describe the signal following degree more intuitively, as Figure 3 shown, for a set of transmission power curves and received power curves, when the change in the transmission power shows an upward trend, under normal circumstances, the received power should rise synchronously with the transmission power, indicating a high signal following degree between the two, and the charging efficiency of the charging device is improved synchronously. Correspondingly, when the transmission power rises while the received power does not rise synchronously, it indicates a low signal following degree between the two, and the charging efficiency of the charging device decreases.

[0067] When there are some adverse factors during the wireless charging process, such as metal foreign object interference, poor coil coupling, etc., the change in the transmission power may not be reflected in the received power in a timely or accurate manner. For example, the transmission power increases, but due to the interference of foreign objects, the receiver does not correspondingly receive more received power, and may even cause the received power to decrease. The low signal following degree between the transmission power and the received power indicates a decrease in the energy transfer efficiency of the charging device and an abnormal situation. When a low signal following degree occurs, it usually can prompt that the current wireless charging of the system is interfered or there is a fault, such as a foreign object blocking the effective transmission of energy.

[0068] It can be understood that, compared with the traditional detection method that only compares the instantaneous difference between the transmitted power and the received power, the present application does not adopt single data point difference calculation, but continuously monitors the overall trend and matching degree of the changes in the transmitted power and the received power, so as to reduce misjudgment caused by the instantaneous changes in the transmitted power or the received power. Moreover, the present application can further improve the detection accuracy and the robustness of the system by means of multi-stage signal follow-up detection and dynamic adjustment of different detection thresholds. When initially detecting the signal follow-up degree, if the system finds that the matching degree between the transmitted power and the received power is low, it will further monitor the signal follow-up degree for multiple consecutive time periods and make a comprehensive judgment by combining multiple detection results. In addition, the present application can also dynamically adjust the threshold according to the signal response duration and coupling degree obtained in real time, avoid false alarms caused by normal power fluctuations or time delays, ensure that the system can accurately identify and respond in abnormal situations, and thus effectively improve the safety and detection accuracy in the wireless charging process.

[0069] In some embodiments, when the signal follow-up degree between the transmitted power and the received power is high, the energy transfer between the transmitter and the receiver is stable and efficient, and the charging device can continue charging. Correspondingly, when the signal follow-up degree is low, the system can take corresponding measures, such as stopping charging or adjusting the power output, to avoid the safety risks of charging.

[0070] In the above manner, the present application can determine whether there is a foreign object in the wireless charging process through the signal follow-up degree. If the signal follow-up degree decreases, it indicates that there may be a foreign object or other interference factors in the charging area of the wireless charging, and further detection can be triggered or charging can be directly stopped to ensure safety, so that foreign object detection can be carried out not only relying on the power difference between the transmitted power and the received power.

[0071] In some embodiments, the signal follow-up degree can be determined by the following method:

[0072] Obtain a first change rate of the transmitted power and a second change rate of the received power within a preset time period;

[0073] Determine the signal follow-up degree between the transmitted power and the received power according to the first change rate and the second change rate.

[0074] Among them, the first change rate of the transmitted power refers to the change rate of the transmitted power within a preset time period. Specifically, the first change rate indicates how the transmitted power changes over time, such as whether the transmitted power is increasing, decreasing or remaining stable.

[0075] Wherein, the second change rate refers to the change rate of the received power within the same preset time period of the transmission power, which is used to reflect how the received power changes over time, that is, how the received power changes with time. For example, the second change rate can reflect whether the change of the received power can follow the change of the transmission power in a timely manner.

[0076] In some embodiments, the first change rate and the second change rate are determined in the following manner:

[0077] Obtain the transmission power difference according to the difference between the transmission power at the first moment and the transmission power at the second moment in the preset time period;

[0078] Obtain the received power difference according to the difference between the received power at the first moment and the received power at the second moment;

[0079] Take the ratio of the transmission power difference to the time interval between the first moment and the second moment as the first change rate, and take the ratio of the received power difference to the time length as the second change rate.

[0080] Specifically, the first moment and the second moment of the preset time period can be determined first, and are represented by t1 and t2 respectively. For example, the first moment can be the starting moment of the preset time period, the second moment can be the ending moment of the preset time period, and the first moment and the second moment can also be any two moments within the preset time period. This embodiment does not limit this.

[0081] In some embodiments, the difference between the transmission power at the first moment and the transmission power at the second moment can be calculated first to obtain the transmission power difference, which can be specifically expressed as:

[0082] ΔTX = TX(t2) - TX(t1);

[0083] Wherein, ΔTX is the transmission power difference, TX(t1) is the transmission power at the first moment, TX(t2) is the transmission power at the second moment, and this transmission power difference can reflect the change amount of the transmission power.

[0084] Correspondingly, the difference between the received power at the first moment and the received power at the second moment can be calculated to obtain the received power difference, which can be specifically expressed as:

[0085] ΔRX = RX(t2) - RX(t1);

[0086] Wherein, ΔRX is the received power difference, RX(t1) is the received power at the first moment, RX(t2) is the received power at the second moment, this received power difference can reflect the change amount of the received power, and this received power difference represents the change amount of the received power within the same preset time period.

[0087] In some embodiments, the first change rate can be determined by taking the ratio of the transmission power difference ΔTX to the time duration Δt = Δt2 - Δt1 between the first moment and the second moment. The expression for the first change rate is:

[0088]

[0089] where A is the first change rate, t1 and t2 are the first moment and the second moment respectively, TX(t1) is the transmission power at the first moment, and TX(t2) is the transmission power at the second moment. The first change rate represents the rate of change of the transmission power per unit time and reflects the dynamic change of the transmission power within a preset time period.

[0090] Correspondingly, the second change rate can be determined by taking the ratio of the received power difference ΔRX to the same time duration Δt. The expression for the second change rate is:

[0091]

[0092] where B is the second change rate, t1 and t2 are the first moment and the second moment respectively, RX(t1) is the received power at the first moment, and RX(t2) is the received power at the second moment. The second change rate represents the rate of change of the received power per unit time and shows whether the received power follows the change of the transmission power in a timely manner.

[0093] It can be understood that by calculating the first change rate of the transmission power and the second change rate of the received power, the system can evaluate whether the received power accurately follows the change of the transmission power. In theory, if the wireless charging system works properly and there is no foreign object interference, the first change rate and the second change rate should be very close, that is, the change of the transmission power should be reflected in the change of the received power in a timely manner.

[0094] Specifically, if the difference between the first change rate and the second change rate is small, it indicates that the received power follows the change of the transmission power well, the signal followability is high, and the system can continue to charge normally. If the difference is large, it may indicate the presence of foreign objects or other interferences, the signal followability is low, and the system can take measures (such as stopping charging) to ensure safety.

[0095] In the above manner, the present invention measures the change amounts of the transmission power and the received power within a preset time period and calculates the ratios of them to the time duration. The system can obtain the first change rate of the transmission power and the second change rate of the received power. By comparing these two change rates, the system can effectively judge the signal followability between the transmission power and the received power during the wireless charging process, thereby ensuring the safety and effectiveness of charging.

[0096] In some embodiments, the difference between the first change rate and the second change rate, or the ratio between the first change rate and the second change rate, can be determined as the signal following degree.

[0097] In some embodiments, the signal following degree can be determined by calculating the ratio of the first change rate to the second change rate, and this ratio can be C, specifically expressed as It can be understood that when this ratio is close to 1, it indicates that the change rate of the received power is almost equal to the change rate of the transmitted power, and the signal following degree is high, indicating that the energy transmission process in the system is stable and consistent. When this ratio is far from 1, it means that the change of the received power fails to accurately follow the change of the transmitted power, and the signal following degree is low. For example, this may be caused by problems such as the presence of foreign objects interfering or poor coupling.

[0098] In some embodiments, the difference between the first change rate and the second change rate can also be determined as the signal following degree between the two. For example, the difference between the first change rate and the second change rate can be obtained by calculating B - A or |B - A|. The smaller the calculated difference is, the closer the current transmitted power and the change of the received power are synchronized, the better the received power can follow the change of the transmitted power, and the higher the signal following degree between the two is, and the charging operation is normal. Correspondingly, the larger the calculated difference is, the more inconsistent the changes of the transmitted power and the received power are, there may be foreign objects or other interferences, the signal following degree is low, and protection measures may need to be taken for the charging operation.

[0099] Calculating the signal following degree through the difference is applicable to scenarios where a simple and direct evaluation of the consistency of the changes in the transmitted and received powers is required, while calculating the signal following degree through the ratio is more applicable to scenarios where a more refined analysis of the relative changes between the transmitted and received powers is needed. By calculating the signal following degree in any one of the above two ways, the present application can improve the accuracy and flexibility of calculating the signal following degree.

[0100] Step 102: Detect whether there are foreign objects affecting normal charging in the charging area of the charging device according to the signal following degree.

[0101] It can be understood that since the signal following degree can accurately reflect the matching degree of the changes between the transmitted power of the charging device and the received power of the charging object, subsequent effective foreign object detection can be performed through one or more obtained signal following degrees.

[0102] In some embodiments, foreign object detection can be performed in the following manner:

[0103] Detect whether the first signal following degree between the transmitted power of the charging device and the received power of the charging object within the first preset period is greater than the first threshold. If the first signal following degree is less than or equal to the first threshold, it is determined that there are no foreign objects in the charging area;

[0104] If the first signal follow - up degree is greater than the first threshold, then obtain multiple second signal follow - up degrees between the transmission power of the charging device and the reception power of the charging object within multiple consecutive second preset time periods after the first preset time period.

[0105] Detect whether the multiple second signal follow - up degrees meet the preset conditions. If they meet the preset conditions, it is determined that there is a foreign object in the charging area; if they do not meet the preset conditions, it is determined that there is no foreign object in the charging area.

[0106] In some embodiments, the method of the present application can divide foreign object detection into two stages to detect whether there is a foreign object during the wireless charging process.

[0107] In the first - stage detection, first detect whether the first signal follow - up degree between the transmission power of the charging device and the reception power of the charging object within the first preset time period is greater than the first threshold. If the first signal follow - up degree is less than or equal to the first threshold, it means that the matching degree between the transmission power and the reception power is within the normal range, and the signal follow - up degree is high. Therefore, the system can initially determine that there is no foreign object in the charging area, and the charging process can continue safely.

[0108] Correspondingly, if the first signal follow - up degree is greater than the first threshold, it means that the matching degree between the transmission power and the reception power is not good enough, and the signal follow - up degree is low. There may be abnormal situations, such as foreign object interference in the charging area. At this time, the system cannot immediately determine whether there is a foreign object in the charging area and needs further detection.

[0109] In some embodiments, if in the first - stage detection, the first signal follow - up degree is greater than the first threshold, the system can enter the second - stage detection. In the second - stage detection, the system can obtain the signal follow - up degrees within multiple consecutive second preset time periods after the first preset time period and calculate multiple second signal follow - up degrees. Therefore, the multiple second signal follow - up degrees are determined by continuously monitoring the matching situation of the transmission power and the reception power in subsequent multiple time periods, aiming to confirm whether the signal follow - up degree is continuously abnormal.

[0110] In some embodiments, these continuous second signal follow - up degrees can be compared with a preset condition to check whether they meet a certain preset condition. If multiple second signal follow - up degrees meet the preset condition, for example, multiple second signal follow - up degrees continuously exceed a certain threshold, or these signal follow - up degrees show abnormal persistence, the system can further confirm that there may be foreign objects in the charging area, the charging process may be interrupted or an alarm may be issued. Correspondingly, if multiple second signal follow - up degrees do not meet the preset condition, and if the second signal follow - up degrees return to normal within a subsequent period and the signal follow - up degrees return to the safe range, the system can determine that the previous abnormality may be caused by a transient power fluctuation or other harmless factors, there are no foreign objects in the charging area, and the charging process can continue.

[0111] Through the preliminary detection of the first signal follow - up degree, the system can quickly screen out obvious situations without foreign objects, reducing the unnecessary detection burden. For situations that may be abnormal, through the detection of the second signal follow - up degree in multiple consecutive periods, the system can more accurately determine whether there are foreign objects, thereby improving the accuracy and robustness of the detection and reducing false alarms. Through the above multi - stage detection mechanism, it is possible to effectively balance the response speed and detection accuracy of the system, ensure timely interruption of charging in case of possible foreign objects, and protect the safety of the device and the user.

[0112] In some embodiments, the following method is used to determine whether the second signal follow - up degree meets the preset condition:

[0113] Determine the number of third signal follow - up degrees greater than the second threshold from multiple second signal follow - up degrees. If the number of third signal follow - up degrees is greater than the third threshold, it means that multiple second signal follow - up degrees meet the preset condition;

[0114] If the number of third signal follow - up degrees is less than or equal to the third threshold, it means that multiple second signal follow - up degrees do not meet the preset condition.

[0115] Among them, the second signal follow - up degree refers to the matching degree between the transmit power and the receive power within multiple consecutive second preset periods. Each second preset period generates a second signal follow - up degree value for evaluating the synchronization of power changes.

[0116] In some embodiments, each second signal follow - up degree can be compared with a preset second threshold. If a certain second signal follow - up degree is greater than this second threshold, then this signal follow - up degree is determined as the third signal follow - up degree. The third signal follow - up degree is a signal follow - up degree that significantly deviates from the normal range, indicating that there is a large degree of asynchrony between the transmit power and the receive power during these periods, which may indicate the presence of foreign objects or other interferences.

[0117] In some embodiments, it is possible to count how many second signal follow - up degrees are confirmed as third signal follow - up degrees, that is, the number of signal follow - up degrees greater than the second threshold, within multiple second preset time periods. This number can reflect the frequency and persistence of significant anomalies detected by the system over a period of time.

[0118] In some embodiments, a third threshold can be set to determine whether the number of abnormal signals is excessive. This third threshold can be determined based on actual tests and experience and represents the maximum allowable number of abnormal signals within a certain period of time.

[0119] If the number of third signal follow - up degrees is greater than the third threshold, it means that within multiple consecutive time periods, the system has detected more abnormal third signal follow - up degrees than the allowable number, indicating that the abnormal signal follow - up degrees are non - accidental and persistent. Therefore, when the system determines that multiple second signal follow - up degrees meet the preset conditions, it indicates that there may be foreign objects in the charging area, and charging can be interrupted or an alarm can be issued to ensure safety.

[0120] Correspondingly, if the number of third signal follow - up degrees is less than or equal to the third threshold, it means that the number of abnormal signals is within the allowable range, and it may just be accidental power fluctuations or harmless short - term interferences. When the system determines that multiple second signal follow - up degrees do not meet the preset conditions, it indicates that there are no foreign objects in the charging area, and the charging process can continue.

[0121] By the above method, by counting the number of third signal follow - up degrees greater than the second threshold, the system can effectively identify persistent abnormal signals during the charging process. Compared with single - time or short - term power fluctuations, this method can more accurately determine whether there is a real foreign object interference. It can ensure the detection accuracy while avoiding false alarms caused by short - term or accidental power fluctuations. By setting the third threshold, the system can respond in a timely manner when there are real foreign objects, protecting the safety of the device and the user.

[0122] It should be noted that although the signal follow - up degree can theoretically be calculated based on the first change rate and the second change rate at any two moments, to ensure the calculation accuracy of the signal follow - up degree, both the first signal follow - up degree and the second signal follow - up degree in this application are calculated based on the first change rate and the second change rate at every two adjacent moments.

[0123] In some embodiments, the method of this application may further include:

[0124] Obtain the signal response duration between the transmitted power and the received power during the detection process;

[0125] Adjust the magnitudes of the first threshold and / or the second threshold according to the signal response duration.

[0126] Among them, the signal response duration refers to the time difference during wireless charging when the charging device adjusts the transmission power and the charging object responds to this change and reflects it in the received power. For example, when the transmission power increases, the received power does not immediately sense the change but has a slight delay, and this delay duration is the signal response duration. The system can monitor and record this response duration in real time during the detection process. By monitoring the power changes over multiple time periods, the system can obtain an average or current signal response duration.

[0127] The first threshold and the second threshold are key parameters for determining whether the signal follow - up between the transmission power and the received power is normal. The first threshold is used for preliminary screening to determine whether further detection is required; the second threshold is used to judge whether there are continuous abnormal signals during a more refined detection process.

[0128] It can be understood that different signal response durations will affect the matching degree between the transmission power and the received power. If the signal response duration is short, the changes between the transmission power and the received power will be more synchronous, so the threshold can be set more strictly; while if the signal response duration is long, there may be an obvious time lag in the power change, and the threshold needs to be appropriately relaxed to avoid misjudgment.

[0129] In some embodiments, the magnitudes of the first threshold and / or the second threshold can be adjusted according to the following methods:

[0130] When the signal response duration is greater than the preset duration, decrease the first threshold and / or increase the magnitude of the second threshold;

[0131] When the signal response duration is less than or equal to the preset duration, increase the first threshold and / or decrease the magnitude of the second threshold.

[0132] It can be understood that if the signal response duration is short, it indicates that the matching between the transmission power and the received power is good, and a stricter threshold can be set for the detection of signal follow - up, and the system can detect abnormal situations more quickly. If the signal response duration is long, it indicates that there is a certain delay in the response between the transmission power and the received power. At this time, the system needs to relax the threshold and can set a looser threshold for the detection of signal follow - up to avoid false alarms due to normal time delays.

[0133] During the detection process of the first stage, if the system detects that the signal response duration is relatively long, for example, the signal response duration is greater than the preset duration, the size of the first threshold can be reduced, making the system more lenient in the preliminary screening and reducing the possibility of false alarms. Correspondingly, if the system detects that the signal response duration is relatively short, for example, the signal response duration is less than or equal to the preset duration, the first threshold can be appropriately tightened and the size of the first threshold can be increased. When entering the more detailed detection of the second stage, the system can also adjust the second threshold according to the signal response duration. If the signal response duration is long, for example, greater than the preset duration, the system can relax and reduce the second threshold to ensure that during the multi-period detection process, more third signal follow-up degrees will not be screened out due to fluctuations caused by delays, and thus misjudged as foreign objects existing in the charging area. Correspondingly, when the signal response duration is short, for example, less than or equal to the preset duration, the system can tighten and increase the second threshold, relaxing the screening criteria for the third signal follow-up degree. Therefore, the present application can improve the detection accuracy by adjusting the threshold size according to the signal response duration.

[0134] It should also be noted that when the signal response duration is less than or equal to the preset duration, it indicates that the current signal response duration is within a reasonable range. Therefore, it is also possible not to adjust the current first threshold and second threshold, and the sizes of the first threshold and second threshold remain unchanged.

[0135] By dynamically adjusting the threshold according to the signal response duration, the system can better adapt to different working environments and device states. This flexibility ensures that the system can accurately detect the presence of foreign objects without false alarms due to the natural delay of the power response. During the system detection process, accurate threshold setting can improve the overall detection accuracy and robustness, avoid misjudgment caused by too strict or too wide set thresholds, and ensure correct judgment under correct circumstances. By obtaining the signal response duration between the transmitted power and the received power, the system can dynamically adjust the size of the first threshold and / or the second threshold, which helps to adapt to different response times, ensure that the system can avoid misjudgment when detecting foreign objects, and can also issue an alarm or interrupt charging in a timely manner when there is a real foreign object, thereby improving the safety and reliability of the wireless charging process.

[0136] In some embodiments, the method of the present application may further include:

[0137] Obtain the coupling degree between the charging object and the charging device;

[0138] If the coupling degree is less than the sixth threshold, reduce the upper limit value of the transmitted power.

[0139] Coupling refers to the efficiency of electromagnetic coupling between the charging device (usually the transmitting coil of a wireless charger) and the charging target (such as the receiving coil of a mobile phone or other receiving device). A high coupling degree indicates efficient energy transfer from the transmitting coil to the receiving coil, minimizing energy loss; a low coupling degree indicates low transmission efficiency and significant energy loss.

[0140] The sixth threshold is a system-defined coupling threshold used to determine whether the current coupling level is within a safe range. This threshold is typically determined based on experience and experimental data, representing the minimum coupling efficiency between the transmitting and receiving coils under normal charging conditions.

[0141] In some embodiments, if the coupling degree is greater than or equal to a sixth threshold, it indicates that the coupling degree is within a safe range, the energy transmission efficiency is high, and normal transmit power can be maintained. If the coupling degree is less than the sixth threshold, it indicates that the coupling degree is low, the energy transmission efficiency is low, and the system may need to take measures to avoid potential safety hazards.

[0142] The upper limit of the transmit power refers to the maximum power that the system allows the transmitter to output. If the coupling degree is low, excessively high transmit power may lead to increased energy loss and even cause safety issues such as overheating. When the system detects that the coupling degree is less than the sixth threshold, it lowers the upper limit of the transmit power. This means that the system will limit the maximum output power of the transmitter to ensure that even at low coupling degrees, the transmitted energy will not be converted into excessive heat due to ineffective transmission to the receiving end. By lowering the upper limit of the transmit power, the system can prevent heating problems caused by low coupling, protect the safety of charging equipment, and reduce ineffective energy consumption caused by excessive power.

[0143] By monitoring and adjusting the transmit power cap, the system can effectively mitigate potential safety risks in situations where coupling is suboptimal, preventing device overheating and other safety issues caused by inefficient energy transmission. Lowering the transmit power cap helps avoid unnecessary energy waste under low coupling conditions, thereby improving overall system energy efficiency.

[0144] This application obtains the coupling degree between the charging object and the charging device in real time and determines whether to lower the upper limit of the transmission power based on the comparison result of the signal coupling degree with the sixth threshold. When the coupling degree is low, the system will reduce the upper limit of the transmission power to prevent energy waste and device overheating, ensuring the safety and efficiency of the wireless charging process.

[0145] In some embodiments, the method of the present application may further include:

[0146] Obtaining a first quality parameter value of a coil of the charging device before performing a charging operation;

[0147] When a foreign object is detected in the charging area, the charging operation of the charging device for the charging object is paused, and the second quality parameter value of the coil of the charging device is obtained;

[0148] Verify the detection result of the presence of a foreign object in the charging area according to the first quality parameter value and the second quality parameter value.

[0149] Among them, the quality parameter value is the Q value, which is an important indicator to measure the electromagnetic characteristics of the coil of the charging device and reflects the energy transfer efficiency of the coil. Generally, the higher the Q value, the smaller the energy loss of the coil and the higher the transfer efficiency. Before the charging operation starts, the system can measure the Q value of the coil of the charging device, and this measured value is the first quality parameter value Q1, representing the normal working state of the charging device without interference.

[0150] Before starting the charging process, the system can obtain and record the current Q value by detecting the electromagnetic characteristics of the coil as a benchmark for subsequent comparison. During the charging process, the system will monitor the state of the charging area in real time. If it detects a possible foreign object (such as through abnormal signal follow-up and other indicators), the system will respond immediately. Once a foreign object is detected, the system will quickly pause the charging operation of the charging device for the charging object. This is to prevent possible safety problems such as overheating or short circuit caused by the presence of a foreign object.

[0151] After pausing the charging, the system will measure the Q value of the coil of the charging device again, and the measured value obtained at this time is called the second quality parameter value Q2. The second quality parameter value reflects the coil state after detecting an abnormality and pausing the charging. If the conditions in the charging area change (such as removing the foreign object or the interference disappearing), the Q value may be different.

[0152] In some embodiments, the system can compare the first quality parameter value Q1 before pausing the charging with the second quality parameter value Q2 measured after pausing to verify whether there is indeed a foreign object in the charging area. If there is a significant difference between the first quality parameter value and the second quality parameter value, it indicates that the electromagnetic environment of the coil has changed, which may be caused by the presence of a foreign object. This verifies the previous detection result of the system, indicating that there is indeed a foreign object in the charging area. If there is no difference or a small difference between the first quality parameter value and the second quality parameter value, it means that the previous foreign object detection may be a false alarm, or the influence of the foreign object has been eliminated after pausing the charging. In this case, the system may determine that there is no foreign object in the charging area and can safely resume charging.

[0153] By comparing the first and second quality parameter values, the system can further verify whether the detected foreign object actually exists. This dual-verification mechanism reduces the possibility of false alarms and improves the accuracy and reliability of detection. When a foreign object is detected, charging is paused and the Q value is re-measured to ensure that the system can take appropriate measures in potential dangerous situations to prevent equipment damage or safety accidents caused by foreign objects. This mechanism effectively ensures the safety of the charging process.

[0154] In some embodiments, the detection results are verified in the following manner:

[0155] If the second quality parameter value is less than the fourth threshold, or the difference between the first quality parameter value and the second quality parameter value is greater than the fifth threshold, it is determined that the verification result is that there is a foreign object in the charging area;

[0156] If the second quality parameter value is greater than or equal to the fourth threshold, and the difference between the first quality parameter value and the second quality parameter value is less than or equal to the fifth threshold, it is determined that the verification result is that there is no foreign object in the charging area.

[0157] Among them, the fourth threshold is a preset lower limit of the Q value, which is used to judge the lowest quality parameter value that the coil should reach under normal circumstances. If the Q value is lower than this threshold, it indicates that the performance of the coil may be interfered, and there is a problem of low energy transfer efficiency.

[0158] If the second quality parameter value is less than the fourth threshold, it means that the Q value of the coil is significantly lower than the normal range, which may be caused by the presence of a foreign object in the charging area. Therefore, the system determines that the verification result is that there is a foreign object in the charging area. If the second quality parameter value is greater than or equal to the fourth threshold, it means that the Q value of the coil is within the normal range, indicating that there is no significant interference and there may be no foreign object.

[0159] The difference between the first quality parameter value and the second quality parameter value reflects the change in the coil state during the charging process. If this difference is large, it means that the performance of the coil has changed significantly during the charging process, which may be due to the influence of a foreign object.

[0160] The fifth threshold is a preset difference limit, which represents the reasonable change range between the first quality parameter value and the second quality parameter value under normal circumstances. If the difference between the first quality parameter value and the second quality parameter value exceeds the fifth threshold, it means that there is a foreign object or other abnormal conditions in the charging area. It indicates that the Q value has changed significantly, which may be due to the decrease in energy transfer efficiency caused by a foreign object. Therefore, the system determines that there is a foreign object in the charging area. If the difference between the first quality parameter value and the second quality parameter value is less than or equal to the fifth threshold, it means that the Q value change is within a reasonable range and the coil performance has not decreased significantly. The system determines that there is no foreign object in the charging area.

[0161] It can be understood that if the detected quality parameter value meets any of the above conditions, the system can determine that there is a foreign object in the charging area. In this case, the system can continue to suspend charging and prompt the user to check the charging area, or take other safety measures. If the detected quality parameter values meet both of the above conditions, the system can determine that there is no foreign object in the charging area and safely resume the charging operation.

[0162] In this application, by combining two different thresholds for judgment, the system can more accurately determine whether there is a foreign object. The fourth threshold and the fifth threshold provide double protection to ensure that it is determined that there is a foreign object only in the case of obvious abnormality. Through this mechanism of double-condition determination, false alarms caused by normal environmental changes or accidental interferences can be effectively reduced, improving the reliability of the charging system and the user experience.

[0163] Figure 2 It is a schematic flowchart of a foreign object detection method for wireless charging provided in an exemplary embodiment of this application, which may include the following steps 201-207, specifically as follows:

[0164] Step 201: The charging device stands by and determines whether a load is detected.

[0165] Step 202: Enter the charging state, obtain the transmitted power and the received power, and calculate the signal following degree.

[0166] Step 203: Determine whether the first signal following degree is greater than the first threshold. If so, enter step 205; if not, enter step 204.

[0167] Step 204: Report the detection result of no foreign object detected.

[0168] Step 205: Determine whether the second signal following degree meets the preset condition. If so, enter step 206; if not, enter step 204.

[0169] Step 206: Report the detection result of a foreign object detected and stop charging.

[0170] Step 207: Verify whether the coil quality parameter of the charging device meets the preset condition.

[0171] It should be noted that regarding the content repeated with steps 101-102 in Figure 1 it will not be elaborated here.

[0172] Figure 4 It is a block diagram of an electronic device 300 shown according to an exemplary embodiment. As Figure 4As shown, the electronic device 300 may include: a processor 301 and a memory 302. The electronic device 300 may also include one or more of a multimedia component 303, an input / output (I / O) component 304, and a communication component 305.

[0173] Among them, the processor 301 is used to control the overall operation of the electronic device 300 to complete all or part of the steps in the foreign object detection method for wireless charging described above. The memory 302 is used to store various types of data to support the operation of the electronic device 300. Such data may include, for example, instructions for any application or method operating on the electronic device 300, as well as application-related data, such as contact data, sent and received messages, pictures, audio, video, and so on. The memory 302 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic memory, flash memory, a magnetic disk, or an optical disc. The multimedia component 303 may include a screen and an audio component. The screen may be, for example, a touch screen, and the audio component is used to output and / or input audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signal may be further stored in the memory 302 or sent through the communication component 305. The audio component also includes at least one speaker for outputting audio signals. The I / O component 304 provides an interface between the processor 301 and other interface modules, and the other interface modules may be a keyboard, a mouse, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 305 is used for wired or wireless communication between the electronic device 300 and other devices. Wireless communication, such as WiFi, Bluetooth, Near Field Communication (NFC), 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, etc., wired communication, such as CAN communication, CANFD communication, LIN communication, etc., or a combination of one or several of them is not limited herein. Therefore, the corresponding communication component 305 may include: a WiFi module, a Bluetooth module, an NFC module, and so on.

[0174] In an exemplary embodiment, the electronic device 300 may be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors or other electronic components, and is used to execute the foreign object detection method for wireless charging described above.

[0175] In another exemplary embodiment, a computer-readable storage medium including program instructions is further provided. When the program instructions are executed by a domain controller, the steps of the foreign object detection method for wireless charging described above are implemented. For example, the computer-readable storage medium may be the memory 302 including the program instructions described above, and the program instructions may be executed by the processor 301 of the electronic device 300 to complete the following steps:

[0176] Obtain the signal followability between the transmission power of the charging device and the reception power of the charging object; the signal followability represents the matching degree between the change in the transmission power and the change in the reception power;

[0177] According to the signal followability, detect whether there is a foreign object affecting normal charging in the charging area of the charging device.

[0178] Figure 5 It is a block diagram of a vehicle provided in an embodiment of the present application. As Figure 5 shown, the vehicle 400 includes the above-mentioned electronic device 300.

[0179] The embodiment of the present application further provides a computer-readable storage medium. The computer-readable storage medium stores a computer program for electronic data exchange, and the computer program enables a computer to execute some or all of the steps of any one of the charging control methods described in the above method embodiments.

[0180] It should be noted that, for the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that this application is not limited by the described action sequence, because according to this application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0181] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0182] In several embodiments provided by this application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection to each other can be through some interfaces. The indirect coupling or communication connection of the device or unit can be in an electrical or other form.

[0183] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place, or they can be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0184] In addition, the functional units in the respective embodiments of the application can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above integrated units can be implemented in the form of hardware or in the form of software program modules.

[0185] When the integrated unit is implemented in the form of a software program module and sold or used as an independent product, it can be stored in a computer-readable storage unit. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage unit and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application. The aforementioned storage unit includes: various media such as USB flash drives, read-only memory (ROM), random access memory (RAM), mobile hard disks, magnetic disks, or optical discs that can store program codes.

[0186] Those of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing relevant hardware through a program. This program can be stored in a computer-readable storage unit, and the storage unit can include: flash drives, read-only memory, random access memory, magnetic disks, or optical discs, etc.

[0187] The preferred embodiments of this application have been described in detail above in conjunction with the accompanying drawings. However, this application is not limited to the specific details in the above embodiments. Within the scope of the technical concept of this application, various simple modifications can be made to the technical solution of this application, and these simple modifications all fall within the protection scope of this application.

[0188] In addition, it should be noted that, in the case of no contradiction, the various specific technical features described in the above specific embodiments can be combined in any suitable way. To avoid unnecessary repetition, this application does not separately describe various possible combination methods.

[0189] In addition, any combination can be made between various different embodiments of this application, as long as it does not violate the idea of this application, it should also be regarded as the content disclosed in this application.

Claims

1. A foreign object detection method for wireless charging, characterized in that, The method includes: Obtaining the signal followability between the transmission power of the charging device and the reception power of the charging object; the signal followability represents the matching degree between the change in the transmission power and the change in the reception power; Detecting whether there is a foreign object affecting normal charging in the charging area of the charging device according to the signal followability.

2. The foreign object detection method for wireless charging according to claim 1, wherein The obtaining of the signal followability between the transmission power of the charging device and the reception power of the charging object includes: Obtaining a first change rate of the transmission power and a second change rate of the reception power within a preset time period; Determining the signal followability between the transmission power and the reception power according to the first change rate and the second change rate.

3. The foreign object detection method for wireless charging according to claim 2, wherein The obtaining of the first change rate of the transmission power and the second change rate of the reception power within a preset time period includes: Obtaining a transmission power difference according to the difference between the transmission power at a first moment and the transmission power at a second moment in the preset time period; Obtaining a reception power difference according to the difference between the reception power at the first moment and the reception power at the second moment; Taking the ratio of the transmission power difference to the time interval between the first moment and the second moment as the first change rate, and taking the ratio of the reception power difference to the time duration as the second change rate.

4. The foreign object detection method for wireless charging according to claim 2, characterized in that, The determining of the signal followability between the transmission power and the reception power according to the first change rate and the second change rate includes: Determining the difference between the first change rate and the second change rate as the signal followability.

5. The foreign object detection method for wireless charging according to claim 2, wherein The detecting of whether there is a foreign object affecting normal charging in the charging area of the charging device according to the signal followability includes: Detecting whether a first signal followability between the transmission power of the charging device and the reception power of the charging object within a first preset time period is greater than a first threshold. If the first signal followability is less than or equal to the first threshold, it is determined that there is no such foreign object in the charging area; If the first signal followability is greater than the first threshold, obtaining a plurality of second signal followabilities between the transmission power of the charging device and the reception power of the charging object within a plurality of consecutive second preset time periods after the first preset time period; Detecting whether the plurality of second signal followabilities meet a preset condition. If the preset condition is met, it is determined that there is such a foreign object in the charging area. If the preset condition is not met, it is determined that there is no such foreign object in the charging area.

6. The foreign object detection method for wireless charging according to claim 5, wherein The detecting of whether the plurality of second signal followabilities meet a preset condition includes: Determining the number of third signal followabilities greater than a second threshold from the plurality of second signal followabilities. If the number of the third signal followabilities is greater than a third threshold, it indicates that the plurality of second signal followabilities meet the preset condition; If the number of the third signal followabilities is less than or equal to the third threshold, it indicates that the plurality of second signal followabilities do not meet the preset condition.

7. The foreign object detection method for wireless charging according to claim 1, wherein The method further includes: Obtaining a first quality parameter value of the coil of the charging device before performing a charging operation; When the foreign object is detected in the charging area, suspend the charging operation of the charging device for the charging object, and obtain the second quality parameter value of the coil of the charging device; Verify the detection result of the presence of the foreign object in the charging area according to the first quality parameter value and the second quality parameter value.

8. The foreign object detection method for wireless charging according to claim 7, wherein The verifying the detection result of the presence of the foreign object in the charging area according to the first quality parameter value and the second quality parameter value includes: If the second quality parameter value is less than the fourth threshold, or the difference between the first quality parameter value and the second quality parameter value is greater than the fifth threshold, determine that the verification result is that there is a foreign object in the charging area; If the second quality parameter value is greater than or equal to the fourth threshold, and the difference between the first quality parameter value and the second quality parameter value is less than or equal to the fifth threshold, determine that the verification result is that there is no foreign object in the charging area.

9. The foreign object detection method for wireless charging according to claim 5 or 6, characterized in that, The method further includes: Obtain the signal response duration between the transmission power and the reception power during the detection process; Adjust the magnitude of the first threshold and / or the second threshold according to the signal response duration.

10. The foreign object detection method for wireless charging according to claim 9, wherein The adjusting the magnitude of the first threshold and / or the second threshold according to the signal response duration includes: When the signal response duration is greater than the preset duration, decrease the first threshold and / or increase the magnitude of the second threshold; When the signal response duration is less than or equal to the preset duration, increase the first threshold and / or decrease the magnitude of the second threshold.

11. The foreign object detection method for wireless charging according to claim 1, characterized in that The method further includes: Obtain the coupling degree between the charging object and the charging device; If the coupling degree is less than the sixth threshold, lower the upper limit value of the transmission power.

12. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores program instructions, and when the program instructions are executed, the method according to any one of claims 1-11 is implemented.

13. A computer program product, characterized in that, The computer program product includes program instructions, and when the program instructions are executed by a processor, the method according to any one of claims 1-11 is implemented.

14. An electronic device, characterized in that, For executing the method according to any one of claims 1-11.

15. A vehicle, characterized in that, Including the electronic device according to claim 14 above, or, executing the method according to any one of claims 1-11.

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