A wireless charging transmitter FOD detection method, device, equipment and medium

Abstract

The present invention discloses a method, device, equipment, and medium for detecting FOD at a wireless charging transmitter, comprising the following steps: S1, obtaining the input voltage and input current of the transmitter and calculating the transmission power; S2, obtaining the received power reported by the receiver; S3, collecting voltage data at the connection point between the coil and the resonant capacitor, fitting a voltage model of a complete cycle, and calculating the coil loss power based on the voltage model; S4, calculating the power loss; and S5, comparing the power loss with a preset threshold to determine whether a foreign object exists between the wireless charging transmitter and receiver. The present invention takes into account multiple power factors in the wireless charging system by accurately measuring the transmission power and reception power, calculating the coil loss power, and then determining the presence of foreign objects based on the power loss. Compared to a single detection method (such as detecting only the Q value), it can more accurately identify the presence of foreign objects during the charging process.

Description

Technical Field

[0001] The present invention relates to the field of FOD detection technology, and more specifically, to a method, device, equipment and medium for detecting FOD at a wireless charging transmitter. Background Art

[0002] FOD stands for foreign object detection and is an important function of wireless charging. When there is a foreign object between the wireless charging receiver and transmitter coil, especially a metal foreign object, if the wireless charger continues to work, it will cause the foreign object to heat up. For safety, the wireless charging system should reduce the transmission power or stop working directly. However, due to the differences in the types of wireless charging receivers, and the possible center and thickness deviations between the transmitter and receiver, and some of the structures themselves contain "friendly metal", which means that it is part of the system itself, the combined results in large system differences, making it difficult to judge FOD. Before charging begins, foreign objects can be judged by Q value detection. When foreign objects are present, the Q value will be affected, but judging FOD during the charging process is somewhat difficult. This is because during the charging process, the coil loss is large and changes with the charging power, affecting the judgment of foreign object loss power. The existing general FOD ignores coil loss or sets a fixed correction parameter, which has a large error. The above shortcomings need to be improved. Summary of the Invention

[0003] In order to solve or alleviate the problem of low FOD detection accuracy during charging in the above-mentioned prior art, the present invention provides a FOD detection method, device, equipment and medium at a wireless charging transmitter.

[0004] The technical solution of the present invention is as follows:

[0005] A method for detecting FOD at a wireless charging transmitter includes the following steps:

[0006] S1. Get the input voltage of the transmitter and input current , calculate the transmit power ;

[0007] S2. Get the receiving power reported by the receiving end ;

[0008] S3. Collect the voltage data of the connection point between the coil and the resonant capacitor, fit the voltage model of the complete cycle, and calculate the coil loss power based on the voltage model. ;

[0009] S4. Calculate power loss ;

[0010] S5. Compare the power losses The preset threshold is used to determine whether there is a foreign object between the wireless charging transmitter and the receiver.

[0011] Furthermore, the input voltage It is directly collected through an analog-to-digital converter or calculated by an analog-to-digital converter after proportional voltage reduction.

[0012] Furthermore, the input current It is obtained by connecting a sampling resistor in series with the input end of the transmitter, collecting the voltage across the sampling resistor, and then calculating it according to Ohm's law.

[0013] Furthermore, the received power The receiving end sends data to the transmitting end through a wireless communication protocol.

[0014] Furthermore, the voltage data of the connection point between the acquisition coil and the resonant capacitor are fitted by collecting multiple voltage points in multiple cycles, with adjacent voltage points separated by several cycles, and the phases of the multiple voltage points are in an arithmetic progression.

[0015] Furthermore, the coil power loss , using a simplified model ,in The voltage cycle at the connection point between the coil and the resonant capacitor is divided into When collecting The voltage of each collection point, and It is the coefficient obtained by linear fitting of multiple sets of test data in different power ranges in the absence of foreign matter.

[0016] Furthermore, the coefficient and The process is: when there is no foreign matter, measure multiple groups of different power ranges 、 、 and the corresponding Data, determined by linear fitting based on the acquired data and value.

[0017] In order to solve the above problems, the present invention also provides a wireless charging transmitter FOD detection device, the device comprising:

[0018] Transmit power calculation module, used to obtain the input voltage of the transmitter and input current , calculate the transmit power ;

[0019] The receiving power acquisition module is used to obtain the receiving power reported by the receiving end ;

[0020] The coil power loss calculation module is used to collect voltage data at the connection point between the coil and the resonant capacitor, and calculate the coil power loss based on the collected voltage data. ;

[0021] Power loss calculation module, used to calculate power loss ;

[0022] Analysis and judgment module, used to compare the power loss The preset threshold is used to determine whether there is a foreign object between the wireless charging transmitter and the receiver.

[0023] In order to solve the above problem, the present invention further provides an electronic device, comprising:

[0024] at least one processor; and a memory communicatively connected to the at least one processor; wherein,

[0025] The memory stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the FOD detection method for the wireless charging transmitter as described above.

[0026] In order to solve the above problems, the present invention also provides a computer-readable storage medium, including a data storage area and a program storage area, the data storage area stores created data, and the program storage area stores a computer program; wherein, when the computer program is executed by the processor, the FOD detection method for the wireless charging transmitter as described above is implemented.

[0027] The present invention according to the above scheme has the beneficial effect that, by accurately measuring the transmission power, the reception power, and the calculated coil loss power, and then determining the presence of foreign objects based on the power loss, the present invention takes into account multiple power factors in the wireless charging system. Compared with a single detection method (such as detecting only the Q value), the present invention can more accurately identify the presence of foreign objects during the charging process.

[0028] For different wireless charging systems, the coefficients can be fitted by using multiple sets of test data of different power ranges in the absence of foreign objects. and , so that the detection method can adapt to various system differences (such as differences in the type of receiving end, center and thickness deviations between the transmitting end and the receiving end, etc.).

[0029] The coil voltage data is obtained by multi-cycle acquisition and multiple voltage point fitting, which reduces the requirements for the controller sampling rate. This enables ordinary wireless charging controllers to achieve high-precision voltage data acquisition, reducing hardware costs and development difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 A diagram showing the steps of the method of the present invention;

[0032] Figure 2 is the waveform sample to be sampled;

[0033] Figure 3 Fit a waveform graph to the sample graph;

[0034] Figure 4 is the actual fitting waveform;

[0035] Figure 5 Schematic diagram of the module of the device of the present invention;

[0036] Figure 6 Schematic diagram of the internal structure of the device of the present invention. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] It should be noted that when a component is referred to as being "fixed" or "set" or "connected" to another component, it may be located directly or indirectly on the other component. The directions or positions indicated by the terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positions shown in the accompanying drawings and are only for the convenience of description and cannot be understood as limitations on this technical solution. The terms "first", "second", etc. are only used for the convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined. "Several" means one or more, unless otherwise clearly and specifically defined.

[0039] like Figures 1 to 3 As shown, a method for detecting FOD at a wireless charging transmitter end according to one embodiment of the present invention includes the following steps:

[0040] S1. Get the input voltage of the transmitter and input current , calculate the transmit power ;

[0041] S2. Get the receiving power reported by the receiving end ;

[0042] S3. Collect the voltage data of the connection point between the coil and the resonant capacitor, fit the voltage model of the complete cycle, and calculate the coil loss power based on the voltage model. ;

[0043] S4. Calculate power loss ;

[0044] S5. Compare the power losses The preset threshold is used to determine whether there is a foreign object between the wireless charging transmitter and the receiver.

[0045] Input voltage It is directly collected through an analog-to-digital converter or calculated by an analog-to-digital converter after proportional voltage reduction.

[0046] Input current It is obtained by connecting a sampling resistor in series with the input end of the transmitter, collecting the voltage across the sampling resistor, and then calculating it according to Ohm's law.

[0047] Received power The receiving end sends data to the transmitting end through a wireless communication protocol.

[0048] The voltage data of the connection point between the coil and the resonant capacitor are collected by fitting multiple voltage points in multiple cycles, with adjacent voltage points separated by several cycles, and the phases of the multiple voltage points are in an arithmetic progression.

[0049] Coil power loss , using a simplified model ,in The voltage cycle at the connection point between the coil and the resonant capacitor is divided into When collecting The voltage of each collection point, and It is the coefficient obtained by linear fitting of multiple sets of test data in different power ranges in the absence of foreign matter.

[0050] Foreign object absorption power is equal to effective transmit power minus received power. Effective transmit power = total transmit system power - circuit loss power + coil loss power + friendly metal loss power. Coil loss power and friendly metal loss power are both proportional to the square of the transmit current (effective current). Wireless charging transmits at a fixed frequency during a certain period of time. During this period, the voltage on the coil exhibits a periodic waveform, but it is not a sine wave. This can be calculated using the current formula for the resonant capacitor.

[0051]

[0052] in, Indicates the current of the resonant capacitor at the wireless charging transmitter end, Indicates the capacitance value of the resonant capacitor of the wireless charging transmitter. It represents the voltage across the capacitor of the wireless charging transmitter, t represents the time, Indicates the current of the resonant capacitor at the wireless charging transmitter The mean square value of Represents the sampling frequency of the analog-to-digital converter ADC, N represents the number of sampling points in one oscillation cycle, Indicates the difference between the voltage value of the last sampling and the voltage value of the previous sampling.

[0053] The correlation coefficients of the above parts are relatively complex and difficult to calculate accurately in practical applications. A simplified model is proposed as follows. The main loss parts (excluding the loss of foreign matter) are linearly related to the square of the effective current on the transmitting coil. Then, using the relationship that the effective current value is proportional to the square of the capacitor voltage difference, the following simplified model is obtained. .

[0054] coefficient and The process is: when there is no foreign matter, measure multiple groups of different power ranges 、 、 and the corresponding Data, determined by linear fitting based on the acquired data and value.

[0055] Transmit power calculation (S1): The transmitter circuit is equipped with an analog-to-digital converter (ADC), and the input voltage It can be obtained in two ways. If the voltage is within the measurement range of the ADC, it can be directly connected to the ADC for sampling; if the voltage is too high, a step-down circuit is used to reduce the voltage by a certain ratio, and then the stepped-down voltage is connected to the ADC (the ADC sampling value is a dimensionless digital quantity), and the ADC conversion and corresponding calculation are used to obtain the value. At the same time, a sampling resistor of known resistance (such as a milliohm resistor, such as 5mΩ, 10mΩ, 20mΩ, etc.) is connected in series at the input end of the transmitter, and the voltage across the sampling resistor is collected using a voltage measurement circuit. According to Ohm's law , here That is, the transmitter input current , for , is the sampling resistor value, and thus the . and Substitute into the formula , you can calculate the transmit power .

[0056] Received power acquisition (S2): The receiving end is equipped with a power measurement circuit that can measure the received power in real time. The receiving end and the transmitting end are both equipped with wireless communication modules and follow the same wireless communication protocol (such as ASK, BLE, etc.). After that, the data is sent out through the wireless communication module. The wireless communication module at the transmitting end receives the data and analyzes it to obtain the received power. .

[0057] Coil power loss calculation (S3): Since the voltage waveform at the connection point between the coil and the resonant capacitor is periodic (e.g., a 360KHz periodic waveform under the wireless charging MPP protocol), it is difficult for ordinary controllers to quickly collect the complete waveform within one cycle. Therefore, a multi-cycle acquisition method is used to fit multiple voltage points. Set the interval between adjacent voltage points. cycles ( is an integer greater than 1), and the phases of multiple voltage points are in an arithmetic progression. For example, the first point is collected at the starting phase of a cycle, and the second point is collected at The starting phase after one cycle plus Phase acquisition, the third point is The starting phase after one cycle plus Phase acquisition, and so on. After collecting enough voltage points, the voltage of a complete cycle is divided into Equal parts, corresponding to In the absence of foreign matter, pre-measure multiple groups of different power ranges. 、 、 and the corresponding Using these data, a simplified model is determined using a linear fitting algorithm (such as the least squares method). The coefficients in and The collected Substituting this model, the coil power loss can be calculated .

[0058] Power loss calculation (S4): The transmit power calculated in step S1 is , the received power obtained in step S2 and the coil power loss calculated in step S3 Substitute into the formula , calculate the power loss .

[0059] Foreign body judgment (S5): Pre-set threshold , the calculated power loss With threshold Compare. , it is determined that there is a foreign object between the wireless charging transmitter and the receiver; if , it is determined that there is no foreign matter.

[0060] This embodiment accurately measures the transmit power, receive power, and coil loss power, and then determines the presence of foreign objects based on the power loss. This takes into account multiple power factors in the wireless charging system. Compared with a single detection method (such as only detecting the Q value), it can more accurately identify the presence of foreign objects.

[0061] like Figure 4 As shown in the figure, a set of measured comparison data was collected over multiple cycles. The waveform period was approximately 2.7778us. One array was collected every three cycles (approximately 8.354us), and the combined data was then stitched together to accurately restore the waveform. This method was used to collect 261 sets of data. The coefficients k and b were then fitted based on these data. The original data was then used to calculate the error, which was typically within 200mW. When a foreign object was inserted, the result calculated using this formula was generally within 400mW, enabling accurate identification of foreign objects in wireless charging.

[0062] For different wireless charging systems, the coefficients can be fitted by using multiple sets of test data of different power ranges in the absence of foreign objects. and , so that the detection method can adapt to various system differences (such as differences in the type of receiving end, center and thickness deviations between the transmitting end and the receiving end, etc.).

[0063] The coil voltage data is obtained by multi-cycle acquisition and multiple voltage point fitting, which reduces the requirements for the controller sampling rate. This enables ordinary wireless charging controllers to achieve high-precision voltage data acquisition, reducing hardware costs and development difficulty.

[0064] like Figure 5 , which is a module schematic diagram of the FOD detection device 100 based on the wireless charging transmitter of the present invention.

[0065] The wireless charging transmitter-based FOD detection device 100 of the present invention can be installed in an electronic device. Depending on the functions implemented, the wireless charging transmitter-based FOD detection device 100 can include a transmission power calculation module 101, a reception power acquisition module 102, a coil loss power calculation module 103, a power loss calculation module 104, and an analysis and judgment module 105. The module of the present invention can also be referred to as a unit, which refers to a series of computer program segments that can be executed by an electronic device processor and can perform fixed functions, which are stored in the memory of the electronic device.

[0066] In this embodiment, the functions of each module / unit are as follows:

[0067] Transmit power calculation module 101, used to obtain the input voltage of the transmitter and input current , calculate the transmit power ;

[0068] The receiving power acquisition module 102 is used to obtain the receiving power reported by the receiving end. ;

[0069] The coil power loss calculation module 103 is used to collect voltage data at the connection point between the coil and the resonant capacitor, and calculate the coil power loss based on the collected voltage data. ;

[0070] Power loss calculation module 104, used to calculate power loss ;

[0071] Analysis and judgment module 105, used to compare power loss The preset threshold is used to determine whether there is a foreign object between the wireless charging transmitter and the receiver.

[0072] Transmit power calculation module 101: This module integrates voltage acquisition circuit, current measurement circuit and multiplication unit. The voltage acquisition circuit is responsible for connecting to the ADC and selecting the method of direct acquisition or step-down acquisition according to the size of the input voltage. The current measurement circuit collects the voltage through the sampling resistor connected in series with the transmitter input and calculates The multiplication unit will and Multiply them to get the transmit power and stores the result in an internal cache.

[0073] Received power acquisition module 102: This module includes a wireless communication receiving unit and a decoding circuit. The wireless communication receiving unit receives the wireless signal from the receiving end, and the decoding circuit decodes the signal according to a preset wireless communication protocol (such as ASK protocol) and extracts the received power from it. and pass it to subsequent modules.

[0074] Coil power loss calculation module 103: This module includes a voltage acquisition and processing circuit, a data storage unit, and a fitting calculation unit. The voltage acquisition and processing circuit collects voltage data at the connection point between the coil and the resonant capacitor according to the set multi-cycle acquisition strategy and stores the collected voltage points in the data storage unit. The fitting calculation unit uses a linear fitting algorithm to determine the coefficients based on multiple sets of test data pre-stored in the absence of foreign matter. and , and then substitute the collected voltage data into Calculate the coil power loss .

[0075] Power loss calculation module 104: This module obtains the power loss from the transmission power calculation module 101. , obtained from the received power acquisition module 102 , obtained from the coil power loss calculation module 103 , and then substitute these data into the formula Calculate and get the power loss .

[0076] Analysis and judgment module 105: This module has built-in threshold storage unit and comparison judgment circuit. The threshold storage unit stores the preset threshold The comparison and judgment circuit converts the power loss calculation module 104 obtained With threshold A comparison is performed, and a foreign body judgment signal is output based on the comparison result, such as informing the user whether a foreign body exists in the form of an indicator light or a digital signal.

[0077] like Figure 6 , which is a structural diagram of an electronic device implementing a FOD detection method based on a wireless charging transmitter according to the present invention.

[0078] The electronic device may include a processor 10, a memory 11, a communication bus 12 and a communication interface 13, and may also include a computer program stored in the memory 11 and executable on the processor 10, such as a FOD detection program based on a wireless charging transmitter.

[0079] In some embodiments, the processor 10 may be composed of an integrated circuit, such as a single packaged integrated circuit, or a plurality of packaged integrated circuits with the same or different functions, including one or more central processing units (CPUs), microprocessors, digital processing chips, graphics processors, and a combination of various control chips. The processor 10 is the control core (Control Unit) of the electronic device, connecting the various components of the entire electronic device using various interfaces and lines. It executes or executes programs or modules stored in the memory 11 (such as executing a FOD detection program based on a wireless charging transmitter), and calls data stored in the memory 11 to perform various functions of the electronic device and process data.

[0080] The memory 11 includes at least one type of readable storage medium, including flash memory, a mobile hard disk, a multimedia card, a card-type memory (e.g., SD or DX memory), a magnetic memory, a magnetic disk, an optical disk, etc. In some embodiments, the memory 11 may be an internal storage unit of the electronic device, such as a mobile hard disk of the electronic device. In other embodiments, the memory 11 may also be an external storage device of the electronic device, such as a plug-in mobile hard disk, a smart memory card (SMC), a secure digital (SD) card, a flash memory card, etc. equipped on the electronic device. Furthermore, the memory 11 may include both an internal storage unit of the electronic device and an external storage device. The memory 11 can be used not only to store application software installed in the electronic device and various types of data, such as the code of the FOD detection program based on the wireless charging transmitter, but also to temporarily store data that has been output or is about to be output.

[0081] The communication bus 12 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. This bus can be divided into an address bus, a data bus, a control bus, etc. The bus is configured to enable communication between the memory 11 and at least one processor 10, etc.

[0082] The communication interface 13 is used for communication between the above-mentioned electronic device and other devices, and includes a network interface and a user interface. Optionally, the network interface may include a wired interface and / or a wireless interface (such as a WI-FI interface, a Bluetooth interface, etc.), which is generally used to establish a communication connection between the electronic device and other electronic devices. The user interface may be a display (Display), an input unit (such as a keyboard (Keyboard)), and optionally, the user interface may also be a standard wired interface or a wireless interface. Optionally, in some embodiments, the display may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, and an OLED (Organic Light-Emitting Diode) touch device, etc. Among them, the display may also be appropriately referred to as a display screen or a display unit, which is used to display information processed in the electronic device and to display a visual user interface.

[0083] Figure 6 Only the electronic device with components is shown, and it can be understood by those skilled in the art that Figure 6 The structure shown does not limit the electronic device and may include fewer or more components than shown in the figure, or combine some components, or arrange the components differently.

[0084] For example, although not shown, the electronic device may also include a power source (such as a battery) to power various components. Preferably, the power source can be logically connected to at least one processor 10 via a power management device, thereby enabling functions such as charge management, discharge management, and power consumption management. The power source may also include one or more DC or AC power sources, a recharging device, a power failure detection circuit, a power converter or inverter, a power status indicator, and other arbitrary components. The electronic device may also include various sensors, Bluetooth modules, Wi-Fi modules, etc., which will not be detailed here.

[0085] It should be understood that the embodiment is for illustration only and the scope of the patent application is not limited to this structure.

[0086] The FOD detection program based on the wireless charging transmitter stored in the memory 11 of the electronic device is a combination of multiple computer programs. When running in the processor 10, it can achieve:

[0087] Get the input voltage of the transmitter and input current , calculate the transmit power ;

[0088] Get the receiving power reported by the receiving end ;

[0089] Collect the voltage data of the connection point between the coil and the resonant capacitor, fit the voltage model of the complete cycle, and calculate the coil loss power based on the voltage model ;

[0090] Calculating power loss ;

[0091] Comparing power losses The preset threshold is used to determine whether there is a foreign object between the wireless charging transmitter and the receiver.

[0092] Specifically, the specific implementation method of the processor 10 for the above computer program can refer to Figure 1 The description of the relevant steps in the corresponding embodiments will not be repeated here.

[0093] Furthermore, if the modules / units integrated into electronic devices are implemented as software functional units and sold or used as independent products, they may be stored on a non-volatile computer-readable storage medium. Computer-readable storage media can be either volatile or non-volatile. For example, computer-readable media may include any entity or device capable of carrying computer program code, recording media, USB flash drives, removable hard drives, magnetic disks, optical disks, computer memory, and read-only memory (ROM).

[0094] The present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program. When the computer program is executed by a processor of an electronic device, the computer program can implement:

[0095] Get the input voltage of the transmitter and input current , calculate the transmit power ;

[0096] Get the receiving power reported by the receiving end ;

[0097] Collect the voltage data of the connection point between the coil and the resonant capacitor, fit the voltage model of the complete cycle, and calculate the coil loss power based on the voltage model ;

[0098] Calculating power loss ;

[0099] Comparing the power loss The preset threshold is used to determine whether there is a foreign object between the wireless charging transmitter and the receiver.

[0100] In the several embodiments provided by the present invention, it should be understood that the disclosed devices, apparatuses, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the module division is merely a logical function division, and other division methods may be used in actual implementation.

[0101] The modules described as separate components may or may not be physically separate, and the components shown as modules may or may not be physical units, that is, they may be located in one place or distributed across multiple network elements. Some or all of the modules may be selected to achieve the purpose of the solution of this embodiment according to actual needs.

[0102] In addition, the functional modules in various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or hardware plus software functional modules.

[0103] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

[0104] Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and all changes that come within the meaning and range of equivalents of the claims are intended to be embraced therein. Any reference to a figure in a claim should not be construed as limiting the claim to which it relates.

[0105] The embodiments of the present application can acquire and process relevant data based on artificial intelligence technology. Artificial intelligence (AI) refers to the theories, methods, techniques, and application systems that use digital computers or machines controlled by digital computers to simulate, extend, and expand human intelligence, perceive the environment, acquire knowledge, and use that knowledge to achieve optimal results.

[0106] Furthermore, it is clear that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units or devices recited in a system claim may also be implemented by a single unit or device through software or hardware. Second-order terms are used to indicate names and do not imply any particular order.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for detecting FOD at a wireless charging transmitter, characterized in that: The following steps are involved: S1. Get the input voltage of the transmitter and input current , calculate the transmit power ; S2. Get the receiving power reported by the receiving end ; S3. Collect the voltage data of the connection point between the coil and the resonant capacitor, fit the voltage model of the complete cycle, and calculate the coil loss power based on the voltage model. ; S4. Calculate power loss ; S5. Compare the power losses and the preset threshold to determine whether there is a foreign object between the wireless charging transmitter and the receiver; The voltage data of the connection point between the acquisition coil and the resonant capacitor is fitted by collecting multiple voltage points in multiple cycles, with adjacent voltage points separated by several cycles, and the phases of the multiple voltage points are in an arithmetic progression; The coil power loss , using a simplified model ,in The voltage cycle at the connection point between the coil and the resonant capacitor is divided into When collecting The voltage of each collection point, and It is the coefficient obtained by linear fitting of multiple sets of test data at different power ranges in the absence of foreign matter; The coefficient and The process is as follows: when there is no foreign matter, measure multiple groups of different power ranges. 、 、 and the corresponding Data, determined by linear fitting based on the acquired data and The value of .

2. The method for detecting FOD at a wireless charging transmitter according to claim 1, wherein: The input voltage It is directly collected through an analog-to-digital converter or calculated by an analog-to-digital converter after proportional voltage reduction.

3. The method for detecting FOD at a wireless charging transmitter according to claim 1, wherein: The input current It is obtained by connecting a sampling resistor in series with the input end of the transmitter, collecting the voltage across the sampling resistor, and then calculating it according to Ohm's law.

4. The method for detecting FOD at a wireless charging transmitter according to claim 1, wherein: The received power The receiving end sends data to the transmitting end through a wireless communication protocol.

5. A FOD detection device for a wireless charging transmitter, characterized in that: The device comprises: Transmit power calculation module, used to obtain the input voltage of the transmitter and input current , calculate the transmit power ; The receiving power acquisition module is used to obtain the receiving power reported by the receiving end ; The coil power loss calculation module is used to collect voltage data at the connection point between the coil and the resonant capacitor, and calculate the coil power loss based on the collected voltage data. ; Power loss calculation module, used to calculate power loss ; Analysis and judgment module, used to compare the power loss and the preset threshold to determine whether there is a foreign object between the wireless charging transmitter and the receiver; The voltage data of the connection point between the acquisition coil and the resonant capacitor is fitted by collecting multiple voltage points in multiple cycles, with adjacent voltage points separated by several cycles, and the phases of the multiple voltage points are in an arithmetic progression; The coil power loss , using a simplified model ,in The voltage cycle at the connection point between the coil and the resonant capacitor is divided into When collecting The voltage of each collection point, and It is the coefficient obtained by linear fitting of multiple sets of test data at different power ranges in the absence of foreign matter; The coefficient and The process is as follows: when there is no foreign matter, measure multiple groups of different power ranges. 、 、 and the corresponding Data, determined by linear fitting based on the acquired data and The value of .

6. An electronic device, characterized in that: include: at least one processor; as well as, a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the FOD detection method for the wireless charging transmitter as described in any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that It includes a data storage area and a program storage area, the data storage area stores created data, and the program storage area stores a computer program; wherein, when the computer program is executed by a processor, the FOD detection method for a wireless charging transmitter as described in any one of claims 1 to 4 is implemented.

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