Wireless charging transmitting terminal FOD detection method, device, equipment and medium

Abstract

The invention discloses a wireless charging transmitting end FOD detection method, device, equipment and medium, and the method comprises the following steps: S1, obtaining the input voltage and input current of a transmitting end, and calculating the transmitting power; s2, acquiring receiving power reported by a receiving end; s3, collecting voltage data of a connection point of the coil and the resonance capacitor, fitting a voltage model of a complete period, and calculating the loss power of the coil based on the voltage model; s4, calculating power loss; and S5, comparing the power loss with a preset threshold value, and judging whether foreign matters exist between the wireless charging transmitting end and the receiving end or not. According to the method, the transmitting power and the receiving power are respectively and accurately measured, the coil loss power is calculated, then foreign matter judgment is carried out based on the power loss, various power factors in the wireless charging system are considered, and compared with a single detection mode (for example, only the Q value is detected), the existence of the foreign matter can be more accurately recognized in the charging process.

Description

Technical Field

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

[0002] FOD is foreign object detection, which is an important function of wireless charging. When there is a foreign object between the wireless charging receiving end and the transmitting end coil, especially a metal foreign object, if the wireless charger continues to work, it will cause the foreign object to heat up. For safety reasons, the wireless charging system should reduce the transmission power or stop working directly. However, due to the differences in the types of wireless charging receiving ends, as well as the possible center and thickness deviations between the transmitting end and the receiving end, and there are also some "friendly metals" in the structure itself, that is, it is itself a part of the system, which comprehensively leads to large system differences, and it is relatively difficult to judge FOD. Before charging starts, foreign objects can be judged by Q value detection. When there is a foreign object, it will affect the Q value, but it is difficult to judge FOD during the charging process. This is because during the charging process, the coil loss is large and changes with the charging power, affecting the judgment of the foreign object loss power. Existing general FOD ignores the coil loss or sets a fixed correction parameter, and this method has a large error. The above deficiencies need to be improved. Summary of the Invention

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

[0004] The technical solution of the present invention is as follows: A method for FOD detection at the wireless charging transmitting end includes the following steps: S1. Obtain the input voltage and input current of the transmitting end, and calculate the transmission power ; S2. Obtain the received power reported by the receiving end ; S3. Collect the voltage data at the connection point of 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 the power loss ; S5. Compare the power loss with a preset threshold to judge whether there is a foreign object between the wireless charging transmitting end and the receiving end.

[0005] Further, the input voltage It is directly collected by an analog-to-digital converter or calculated by an analog-to-digital converter after being stepped down proportionally.

[0006] Further, the input current is obtained by connecting a sampling resistor in series at the input end of the transmitting end, collecting the voltage across the sampling resistor, and then calculating according to Ohm's law.

[0007] Further, the received power is sent from the receiving end to the transmitting end by the wireless communication protocol.

[0008] Further, the voltage data at the connection point of the acquisition coil and the resonant capacitor is fitted by collecting multiple voltage points in multiple cycles. The adjacent voltage points are separated by several cycles, and the phases of the multiple voltage points form an arithmetic sequence.

[0009] Further, the coil loss power , adopts a simplified model , where is the voltage of the th acquisition point when the voltage period at the connection point of the coil and the resonant capacitor is divided into parts for acquisition, and are coefficients obtained by linear fitting of test data of multiple different power segments in the absence of foreign objects.

[0010] Further, the process of the coefficients and is as follows: When there is no foreign object, measure , , and the corresponding data under multiple different power segments, and determine the values of and based on the acquired data through linear fitting.

[0011] To solve the above problems, the present invention also provides a wireless charging transmitting end FOD detection device, and the device includes: A transmission power calculation module, configured to obtain the input voltage and input current of the transmitting end, and calculate the transmission power ; A received power acquisition module, configured to acquire the received power reported by the receiving end; A coil loss power calculation module, configured to collect the voltage data at the connection point of the coil and the resonant capacitor, and calculate the coil loss power based on the collected voltage data; A power loss calculation module, configured to calculate the power loss ; An analysis and judgment module for comparing the power loss with a preset threshold value to determine whether there is a foreign object between the wireless charging transmitter and the receiver.

[0012] To solve the above problems, the present invention also provides an electronic device, including: At least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable 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 wireless charging transmitter FOD detection method as described above.

[0013] To solve the above problems, the present invention also provides a computer-readable storage medium, including a storage data area and a storage program area. The storage data area stores created data, and the storage program area stores a computer program; wherein, when the computer program is executed by a processor, it implements the wireless charging transmitter FOD detection method as described above.

[0014] According to the present invention of the above solution, the beneficial effect is that the present invention accurately measures the transmitted power, received power and calculates the coil loss power respectively, and then judges the foreign object based on the power loss, considering various 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 during the charging process.

[0015] For different wireless charging systems, the fitting coefficients of multiple sets of test data in different power segments in the state without foreign objects and are used to make the detection method adaptable to various system differences (such as differences in the types of receivers, center and thickness deviations between the transmitter and the receiver, etc.).

[0016] The coil voltage data is obtained by using the method of fitting multiple voltage points collected in multiple cycles, which reduces the requirement for the sampling rate of the controller, enables ordinary wireless charging controllers to achieve high-precision voltage data acquisition, and reduces the hardware cost and development difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a method step diagram of the present invention; Figure 2 It is a waveform pattern diagram to be sampled; Figure 3 It is a waveform diagram of sample fitting; Figure 4 It is an actual fitting waveform diagram; Figure 5 It is a schematic diagram of the module of the device of the present invention; Figure 6 It is a schematic diagram of the internal structure of the device of the present invention. Specific embodiments

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clear and understandable, the present invention will be 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 used to limit the present invention.

[0020] It should be noted that when a component is referred to as "fixed" or "set" or "connected" to another component, it can be directly or indirectly located on that other component. The orientations or positions indicated by the terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positions shown in the drawings, and are only for the convenience of description and cannot be construed as limiting the technical solution of the present application. The terms "first", "second", etc. are only used for the purpose of convenient description and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of technical features. The meaning of "plurality" is two or more, unless otherwise specifically defined. The meaning of "several" is one or more, unless otherwise specifically defined.

[0021] As Figures 1 to 3 shown, in an embodiment of the present invention, a wireless charging transmitter FOD detection method includes the following steps: S1. Obtain the input voltage and input current of the transmitter, and calculate the transmission power ; S2. Obtain the received power reported by the receiver; S3. Collect voltage data at the connection point of the coil and the resonant capacitor, fit the voltage model of a complete cycle, and calculate the coil loss power based on the voltage model; S4. Calculate the power loss ; S5. Compare the power loss with a preset threshold value to determine whether there is a foreign object between the wireless charging transmitter and the receiver.

[0022] Input voltage It is directly collected by an analog-to-digital converter or calculated by an analog-to-digital converter after being stepped down proportionally.

[0023] Input current It is obtained by connecting a sampling resistor in series at the input end of the transmitting end, collecting the voltage across the sampling resistor, and then calculating according to Ohm's law.

[0024] Received power The receiving end sends the data to the transmitting end through a wireless communication protocol.

[0025] The voltage data at the connection point of the acquisition coil and the resonant capacitor is fitted by collecting multiple voltage points in multiple cycles. The adjacent voltage points are separated by several cycles, and the phases of multiple voltage points form an arithmetic sequence.

[0026] Coil loss power , a simplified model is adopted , where is to divide the voltage period at the connection point of the coil and the resonant capacitor into parts, and is the voltage of the th acquisition point when collecting, and

[0027] The foreign object absorption power is equal to the effective transmission power minus the received power. The effective transmission power = the total power of the transmitting end system - the circuit loss power + the coil loss power + the friendly metal loss power. The coil loss power and the friendly metal loss power are both proportional to the square of the transmitting end current (effective current). The wireless charger emits at a fixed frequency during a certain period. During this period, the voltage on the coil presents a periodic waveform, but not a sine wave. The current formula of the resonant capacitor can be used for calculation.

[0028]

[0029] Among them, represents the current of the resonant capacitor at the transmitting end of the wireless charger, represents the capacitance value of the resonant capacitor at the transmitting end of the wireless charger, represents the voltage across the capacitor at the transmitting end of the wireless charger, t represents time, represents the current of the resonant capacitor at the transmitting end of the wireless charger of the mean square value, represents the sampling frequency of the analog-to-digital converter ADC, N represents the number of sampling points within one oscillation period, represents the difference between the voltage value of the next sampling and the voltage value of the previous sampling.

[0030] The correlation coefficients of the above parts are relatively complex and difficult to accurately calculate in practical applications. A simplified model is proposed as follows. The above-mentioned main loss parts (losses other than foreign objects) are linearly related to the square of the effective current on the transmitting coil. Then, using the relationship that the above effective current value is proportional to the square of the capacitor voltage difference, the following simplified model is obtained 。

[0031] Coefficient and The process is as follows: When there is no foreign object, measure 、 、 and the corresponding data in multiple different power segments. Based on the obtained data, perform linear fitting to determine the and values.

[0032] Transmission power calculation (S1): The transmitting circuit is equipped with an analog-to-digital converter (ADC). The input voltage 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 acquisition; if the voltage is too high, first use a step-down circuit to step down the voltage by a certain ratio, and then connect the stepped-down voltage to the ADC (the ADC sampling value is a dimensionless digital quantity). Through the conversion and corresponding calculation of the ADC, the value is obtained. At the same time, a sampling resistor with a known resistance value (such as a milliohm-level resistor, such as 5 mΩ, 10 mΩ, 20 mΩ, 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 , where is the input current of the transmitter, is , is the resistance value of the sampling resistor, and thus is calculated. Substitute the obtained and into the formula , and the transmission power can be calculated.

[0033] Received power acquisition (S2): The receiving end is equipped with a power measurement circuit that can measure the received power in real time. Both the receiving end and the transmitting end are equipped with wireless communication modules and follow the same wireless communication protocol (such as ASK, BLE, etc.). After the receiving end measures , it sends the data through the wireless communication module. After the wireless communication module of the transmitting end receives the data, it is parsed to obtain the received power .

[0034] Coil loss power calculation (S3): Since the voltage waveform at the connection point of the coil and the resonant capacitor is periodic (such as a 360 KHz periodic waveform under the wireless charging MPP protocol), it is difficult for an ordinary controller to quickly collect a complete waveform within one cycle. Therefore, a method of collecting multiple voltage points through multi-cycle fitting is adopted. Set the interval between adjacent voltage points cycles ( is an integer greater than 1), and the phases of multiple voltage points form an arithmetic sequence. For example, the first point is collected at the starting phase of a certain cycle, the second point is collected at the starting phase plus cycles and phase, the third point is collected at the starting phase plus cycles and phase, and so on. After collecting enough voltage points, divide the voltage of a complete cycle into equal parts, corresponding to . In the state without foreign objects, pre-measure , , and the corresponding data for multiple power segments. Using these data, determine the coefficients and in the simplified model through a linear fitting algorithm (such as the least squares method). Substitute the collected into this model to calculate the coil loss power .

[0035] Power loss calculation (S4): Substitute the transmission power calculated in step S1, the received power obtained in step S2, and the coil loss power calculated in step S3 into the formula to calculate the power loss .

[0036] Foreign object judgment (S5): Preset a threshold , and compare the calculated power loss with the threshold . If , 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 object.

[0037] In this embodiment, by accurately measuring the transmission power, the received power, and calculating the coil loss power respectively, and then making a foreign object judgment based on the power loss, various power factors in the wireless charging system are considered. Compared with a single detection method (such as only detecting the Q value), the presence of foreign objects can be more accurately identified.

[0038] As Figure 4 shown, a set of measured comparison data is collected in multiple cycles. The waveform period is about 2.7778 us. One array is collected every 3 cycles (about 8.354 us). After splicing and combining, the waveform can be well restored. First, 261 groups of data are collected by this method, then the coefficients k and b are fitted according to these data, and then the error is calculated by substituting into the original data. Usually, it is within 200 mW. When a foreign object is placed, the calculation result according to this formula is generally within 400 mW, and the wireless charging foreign object can be accurately identified.

[0039] For different wireless charging systems, the coefficients can be fitted through test data of multiple power segments in the state without foreign objects and , so that the detection method can adapt to various system differences (such as differences in the types of receiving ends, center and thickness deviations between the transmitting end and the receiving end, etc.).

[0040] The coil voltage data is obtained by using the method of collecting and fitting multiple voltage points in multiple cycles, which reduces the requirement for the sampling rate of the controller, enables ordinary wireless charging controllers to achieve high-precision voltage data acquisition, and reduces the hardware cost and development difficulty.

[0041] As Figure 5 shown, it is a schematic diagram of the module of the FOD detection device 100 based on the wireless charging transmitting end of the present invention.

[0042] The FOD detection device 100 based on the wireless charging transmitting end of the present invention can be installed in an electronic device. According to the functions achieved, the FOD detection device 100 based on the wireless charging transmitting end can include a transmitting power calculation module 101, a receiving 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 modules of the present invention can also be referred to as units, which refer to a series of computer program segments that can be executed by the processor of an electronic device and can complete fixed functions, and are stored in the memory of the electronic device.

[0043] In this embodiment, the functions of each module / unit are as follows: The transmitting power calculation module 101 is used to obtain the input voltage of the transmitting end and the input current , and calculate the transmitting power ; The receiving power acquisition module 102 is used to obtain the receiving power reported by the receiving end ; The coil loss power calculation module 103 is used to collect the voltage data at the connection point of the coil and the resonant capacitor, and calculate the coil loss power based on the collected voltage data ; The power loss calculation module 104 is used to calculate the power loss ; The analysis and judgment module 105 is used to compare the power loss with a preset threshold value to judge whether there is a foreign object between the wireless charging transmitter and the receiver.

[0044] The transmission power calculation module 101: This module integrates a voltage acquisition circuit, a current measurement circuit, and a multiplication operation unit. The voltage acquisition circuit is responsible for connecting to the ADC and obtaining the . The current measurement circuit collects the voltage through a sampling resistor connected in series with the input end of the transmitter and calculates the . The multiplication operation unit multiplies the and to obtain the transmission power , and stores the result in the internal cache.

[0045] The 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 receiver, and the decoding circuit decodes the signal according to a preset wireless communication protocol (such as the ASK protocol) to extract the received power , and transfers it to the subsequent module.

[0046] The coil loss power 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 the voltage data at the connection point of 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 determines the coefficients and using the linear fitting algorithm according to multiple groups of pre-stored test data in the no-foreign-object state, and then substitutes the collected voltage data into to calculate the coil loss power .

[0047] The power loss calculation module 104: This module obtains the from the transmission power calculation module 101, obtains the from the received power acquisition module 102, obtains the from the coil loss power calculation module 103, and then substitutes these data into the formula for calculation to obtain the power loss .

[0048] The analysis and judgment module 105: This module is built-in with a threshold storage unit and a comparison and judgment circuit. The preset threshold value is stored in the threshold storage unit . The comparison and judgment circuit compares the result obtained by the power loss calculation module 104 with the threshold value and outputs a foreign object judgment signal according to the comparison result, and informs the user whether there is a foreign object in the form of an indicator light or a digital signal. As shown in

[0049] the figure, Figure 6 it is a schematic structural diagram of an electronic device implementing the FOD detection method based on the wireless charging transmitter of the present invention.

[0050] The electronic device may include a processor 10, a memory 11, a communication bus 12, and a communication interface 13, and may further include a computer program stored in the memory 11 and operable on the processor 10, such as a program for detecting FOD based on the wireless charging transmitter.

[0051] Among them, in some embodiments, the processor 10 may be composed of integrated circuits. For example, it may be composed of a single packaged integrated circuit, or may be composed of multiple integrated circuits with the same or different functions, including a combination of one or more central processing units (CPUs), microprocessors, digital processing chips, graphics processors, and various control chips. The processor 10 is the control core (Control Unit) of the electronic device, connects various components of the entire electronic device through various interfaces and lines, and executes various functions of the electronic device and processes data by running or executing programs or modules stored in the memory 11 (such as executing a program for detecting FOD based on the wireless charging transmitter, etc.), and calling data stored in the memory 11.

[0052] The memory 11 includes at least one type of readable storage medium. The readable storage medium includes flash memory, mobile hard disks, multimedia cards, card-type memories (such as SD or DX memories, etc.), magnetic memories, magnetic disks, optical disks, etc. In some embodiments, the memory 11 may be an internal storage unit of the electronic device, such as the 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 media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the electronic device. Further, the memory 11 may also include both an internal storage unit and an external storage device of the electronic device. The memory 11 can not only be used to store application software installed on the electronic device and various types of data, such as the code of a program for detecting FOD based on the wireless charging transmitter, etc., but also be used to temporarily store data that has been output or will be output.

[0053] The communication bus 12 can be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus can be divided into an address bus, a data bus, a control bus, etc. The bus is configured to implement connection communication between the memory 11 and at least one processor 10, etc.

[0054] The communication interface 13 is used for communication between the above-mentioned electronic device and other devices, including a network interface and a user interface. Optionally, the network interface can include a wired interface and / or a wireless interface (such as a WI-FI interface, a Bluetooth interface, etc.), and is generally used to establish a communication connection between this electronic device and other electronic devices. The user interface can be a display, an input unit (such as a keyboard), and optionally, the user interface can also be a standard wired interface or a wireless interface. Optionally, in some embodiments, the display can be an LED display, a liquid crystal display, a touch liquid crystal display, and an OLED (Organic Light-Emitting Diode) toucher, etc. Among them, the display can also be appropriately referred to as a display screen or a display unit, and is used to display the information processed in the electronic device and to display a visual user interface.

[0055] Figure 6 Only the electronic device with components is shown. Those skilled in the art can understand that Figure 6 the shown structure does not constitute a limitation on the electronic device, and it can include fewer or more components than shown, or combine certain components, or have a different component arrangement.

[0056] For example, a power source. Although not shown, the electronic device can also include a power source (such as a battery) that supplies power to each component. Preferably, the power source can be logically connected to at least one processor 10 through a power management device, so as to implement functions such as charge management, discharge management, and power consumption management through the power management device. The power source can also include any components such as one or more DC or AC power sources, a recharge device, a power failure detection circuit, a power converter or an inverter, and a power status indicator. The electronic device can also include various sensors, a Bluetooth module, a Wi-Fi module, etc., which will not be elaborated here.

[0057] It should be understood that the embodiments are only for illustration purposes and are not limited by this structure in the scope of the patent application.

[0058] The FOD detection program for 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 the following: Obtain the input voltage of the transmitter and the input current , and calculate the transmission power ; Obtain the received power reported by the receiver ; Collect the voltage data at the connection point of 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 ; Calculate the power loss ; Compare the power loss with a preset threshold to determine whether there is a foreign object between the wireless charging transmitter and the receiver.

[0059] Specifically, for the specific implementation method of the above computer program by the processor 10, reference can be made to Figure 1 the description of the relevant steps in the corresponding embodiment, which will not be elaborated here.

[0060] Furthermore, if the integrated module / unit of the electronic device is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a non-volatile computer-readable storage medium. The computer-readable storage medium can be volatile or non-volatile. For example, the computer-readable medium can include: any entity or device capable of carrying computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory).

[0061] The present invention also provides a computer-readable storage medium, and the readable storage medium stores a computer program. When the computer program is executed by the processor of the electronic device, it can achieve the following: Obtain the input voltage of the transmitter and the input current , and calculate the transmission power ; Obtain the received power reported by the receiver ; Collect the voltage data at the connection point of 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 ; Calculate the power loss ; Compare the power loss with a preset threshold to determine whether there is a foreign object between the wireless charging transmitter and the receiver.

[0062] In 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 division of the modules is only a logical function division, and there can be other division methods in actual implementation.

[0063] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0064] In addition, in each embodiment of the present invention, the functional modules 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-mentioned integrated unit can be implemented in the form of hardware or in the form of a combination of hardware and software functional modules.

[0065] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms.

[0066] Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any associated drawing marks in the claims should not be regarded as limiting the claimed rights.

[0067] The embodiments of this application can acquire and process relevant data based on artificial intelligence technology. Among them, artificial intelligence (AI) is the theory, method, technology, and application system that uses digital computers or machines controlled by digital computers to simulate, extend, and expand human intelligence, perceive the environment, acquire knowledge, and use knowledge to obtain the best results.

[0068] In addition, obviously, the word "including" does not exclude other units or steps, and the singular does not exclude the plural. The multiple units or devices stated in the system claims can also be implemented by one unit or device through software or hardware. Words such as second are used to represent names and do not represent any specific order.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for detecting FOD at the wireless charging transmitter end, characterized in that, Including the following steps: S1. Obtain the input voltage of the transmitter and the input current , and calculate the transmission power ; S2. Obtain the received power reported by the receiving end ; S3. Collect the voltage data at the connection point of the acquisition coil and the resonant capacitor, fit the voltage model for a complete cycle, and calculate the coil loss power based on the voltage model. ; S4. Calculate the power loss ; S5. Compare the power loss with a preset threshold value to determine whether there is a foreign object between the wireless charging transmitter and the receiver.

2. The wireless charging transmitter FOD detection method according to claim 1, characterized in that The input voltage is directly acquired by an analog-to-digital converter or calculated by an analog-to-digital converter after being stepped down proportionally.

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

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

5. A wireless charging transmitter FOD detection method according to claim 1, characterized in that The voltage data of the connection point of the acquisition coil and the resonant capacitor is fitted by collecting multiple voltage points in multiple periods. The adjacent voltage points are separated by several periods, and the phases of the multiple voltage points form an arithmetic sequence.

6. The method for detecting FOD at the wireless charging transmitter end according to claim 1, characterized in that, The coil loss power , using a simplified model , where is the voltage at the -th acquisition point when the voltage period at the connection point of the coil and the resonant capacitor is divided into parts for acquisition, and are coefficients obtained by linear fitting of test data for multiple different power segments in a foreign object-free state.

7. A method for detecting FOD at a wireless charging transmitter according to claim 6, characterized in that, The coefficient and are determined as follows: When there is no foreign object, measure , , and the corresponding data under multiple different power segments, and perform linear fitting based on the obtained data to determine the values of and .

8. A wireless charging transmitter FOD detection device, characterized in that, The device includes: The transmission power calculation module is used to obtain the input voltage of the transmitter and the input current , and calculate the transmission power ; A received power acquisition module, which is used to acquire the received power reported by the receiving end ; The coil loss power calculation module is used to collect the voltage data at the connection point of the coil and the resonant capacitor, and calculate the coil loss power based on the collected voltage data ; Power loss calculation module, used to calculate power loss ; An analysis and judgment module for comparing the power loss with a preset threshold to determine whether there is a foreign object between the wireless charging transmitter and the receiver.

9. An electronic device, characterized in that, Including: At least one processor; And, A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to execute the wireless charging transmitter FOD detection method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, Including a data storage area and a program storage area. The data storage area stores the created data, and the program storage area stores a computer program; wherein, when the computer program is executed by a processor, it implements the wireless charging transmitter FOD detection method according to any one of claims 1 to 7.

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