CN112134373A - Metal foreign matter detection method, wireless charging equipment and receiving system - Google Patents
Metal foreign matter detection method, wireless charging equipment and receiving system Download PDFInfo
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- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/60—Circuit arrangements or systems for wireless supply or distribution of electric power responsive to the presence of foreign objects, e.g. detection of living beings
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Abstract
The invention discloses a metal foreign matter detection method, wireless charging equipment and a receiving system, wherein the wireless charging equipment comprises the receiving system, the receiving system comprises a plurality of receiving coils, and the method comprises the following steps: when the terminal is detected to be wirelessly charged, acquiring the output power of each receiving coil in real time, and carrying out normalization processing on the output power of each receiving coil to obtain the quantized value of the output power of each receiving coil; performing mean square error operation on the output power quantized values of the receiving coils, and comparing the mean square error obtained by the operation with a preset threshold value; and if the mean square error is larger than a preset threshold value, determining that a metal foreign matter exists in the electromagnetic space of the wireless charging equipment. The detection mechanism of the invention has low complexity, is suitable for any power protocol and has wider universality.
Description
Technical Field
The invention relates to the technical field of wireless charging, in particular to a metal foreign matter detection method, wireless charging equipment and a receiving system.
Background
Wireless charging is widely used because of the convenience of interfaces, but the principle of electromagnetic energy coupling transmission determines that a high-power alternating magnetic field exists in a coupling space, the alternating magnetic field can cause conductive objects such as metal and the like to generate heat due to an eddy current effect, and if the heat is not released and is accumulated too high, dangers such as combustion and the like can be caused.
At present, a wireless charging metallic foreign object detection method mainly determines whether a metallic foreign object exists according to a difference value of output power of a transmitting disc PTx and output power of a receiving disc PRx of a wireless charging device, however, power protocols supported by different wireless charging devices are different, and the method is difficult to uniformly evaluate a standard and has low universality.
Disclosure of Invention
The invention mainly aims to provide a metal foreign matter detection method, wireless charging equipment and a receiving system, and aims to solve the technical problem that the existing metal foreign matter detection mode is low in universality.
In order to achieve the above object, the present invention provides a metal foreign object detection method applied to a wireless charging device, wherein the wireless charging device includes a receiving system, the receiving system includes a plurality of receiving coils, and the method includes the following steps:
when the terminal is detected to be wirelessly charged, acquiring the output power of each receiving coil in real time, and carrying out normalization processing on the output power of each receiving coil to obtain the quantized value of the output power of each receiving coil;
performing mean square error operation on the output power quantized values of the receiving coils, and comparing the mean square error obtained by the operation with a preset threshold value;
and if the mean square error is larger than a preset threshold value, determining that a metal foreign matter exists in the electromagnetic space of the wireless charging equipment.
Optionally, the step of normalizing the output power of each receiving coil includes:
comparing the output power of each receiving coil to determine the maximum output power;
and dividing the output power of each receiving coil by the maximum output power to obtain an output power quantized value of each receiving coil.
Optionally, the step of performing a mean square error operation on the quantized output power values of the receiving coils includes:
calculating an average value of the quantized output power values of the receiving coils;
and calculating the mean square error of the quantized output power value of each receiving coil by combining the average value.
Optionally, the receiving system further includes a switch, and after the step of determining that a metal foreign object exists in the electromagnetic space of the wireless charging device if the mean square error is greater than a preset threshold, the method includes:
the control switch is turned off to interrupt wireless charging and generate prompt information for displaying the existence of metal foreign matters and the cleaning requirement.
Optionally, after the step of comparing the calculated mean square error with a preset threshold, the method further includes:
and if the mean square error is smaller than a preset threshold value, determining that the electromagnetic space of the wireless charging equipment does not contain metal foreign matters.
Optionally, the plurality of receiving coils are connected in parallel, each receiving coil is a regular hexagon, and the plurality of receiving coils are arranged in a honeycomb manner from inside to outside.
Optionally, after the step of determining that the electromagnetic space of the wireless charging device is free of the metallic foreign object if the mean square error is smaller than a preset threshold, the method includes:
determining a receiving coil corresponding to the maximum output power;
and if the receiving coil corresponding to the maximum output power is not the innermost central coil, generating and displaying prompt information of the terminal misalignment and displacement suggestion.
Further, to achieve the above object, the present invention also provides a wireless charging apparatus, including: the detection device comprises a memory, a processor and a metal foreign matter detection program which is stored on the memory and can run on the processor, wherein the metal foreign matter detection program realizes the steps of the metal foreign matter detection method when being executed by the processor.
In addition, to achieve the above object, the present invention also provides a receiving system, including:
a receive module comprising a plurality of receive coils;
the power detection module is connected with the output end of the receiving module and is used for detecting the output power of each receiving coil in real time;
the control module is connected with the power detection module and comprises a processor and a power management unit;
and the switch is arranged between the receiving module and the control module and used for starting or interrupting the charging operation.
Optionally, the plurality of receiving coils are connected in parallel, each receiving coil is a regular hexagon, and the plurality of receiving coils are arranged in a honeycomb manner from inside to outside.
The invention provides a metal foreign matter detection method, wireless charging equipment and a receiving system, wherein the wireless charging equipment comprises a receiving system, the receiving system comprises a plurality of receiving coils, firstly, when the wireless charging of a terminal is detected, the output power of each receiving coil is obtained in real time, and the output power of each receiving coil is normalized to obtain the quantized value of the output power of each receiving coil; then, performing mean square error operation on the output power quantized values of the receiving coils, and comparing the mean square error obtained by the operation with a preset threshold value; if the calculated mean square error is larger than the preset threshold, the symmetry of the output power distribution of each receiving coil of the receiving system is poor, and the coil coupling area of the receiving system, namely the electromagnetic space of the wireless charging equipment is determined to have the metal foreign matter.
Drawings
Fig. 1 is a schematic structural diagram of a wireless charging device in a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a block diagram of a receiving system according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating a method for detecting metallic foreign objects according to a first embodiment of the present invention;
fig. 4 is a schematic structural frame diagram of a wireless charging device according to a first embodiment of the metal foreign object detection method of the present invention;
fig. 5 is a schematic layout view of a plurality of receiving coils according to a first embodiment of the metal foreign object detection method of the present invention;
fig. 6 is a schematic diagram of a terminal displacement suggestion according to a second embodiment of the metal foreign object detection method of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The main solution of the embodiment of the invention is as follows: when the terminal is detected to be wirelessly charged, acquiring the output power of each receiving coil in real time, and carrying out normalization processing on the output power of each receiving coil to obtain the quantized value of the output power of each receiving coil; performing mean square error operation on the output power quantized values of the receiving coils, and comparing the mean square error obtained by the operation with a preset threshold value; and if the mean square error is larger than a preset threshold value, determining that a metal foreign matter exists in the electromagnetic space of the wireless charging equipment. The technical problem that the universality of the existing metal foreign body detection mode is low is solved.
As shown in fig. 1, fig. 1 is a schematic structural diagram of a wireless charging device in a hardware operating environment according to an embodiment of the present invention.
As shown in fig. 1, the wireless charging apparatus may include: a processor 1001, such as a CPU, a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the wireless charging device configuration shown in fig. 1 does not constitute a limitation of the wireless charging device, and may include more or fewer components than those shown, or some components in combination, or a different arrangement of components.
As shown in fig. 1, a memory 1005, which is a kind of computer storage medium, may include a metallic foreign object detection program therein, and the processor 1001 may be configured to call the metallic foreign object detection program stored in the memory 1005 and perform the following operations:
when the terminal is detected to be wirelessly charged, acquiring the output power of each receiving coil in real time, and carrying out normalization processing on the output power of each receiving coil to obtain the quantized value of the output power of each receiving coil;
performing mean square error operation on the output power quantized values of the receiving coils, and comparing the mean square error obtained by the operation with a preset threshold value;
and if the mean square error is larger than a preset threshold value, determining that a metal foreign matter exists in the electromagnetic space of the wireless charging equipment.
Further, the processor 1001 may call a metal foreign object detection program stored in the memory 1005, and also perform the following operations:
comparing the output power of each receiving coil to determine the maximum output power;
and dividing the output power of each receiving coil by the maximum output power to obtain an output power quantized value of each receiving coil.
Further, the processor 1001 may call a metal foreign object detection program stored in the memory 1005, and also perform the following operations:
calculating an average value of the quantized output power values of the receiving coils;
and calculating the mean square error of the quantized output power value of each receiving coil by combining the average value.
Further, the processor 1001 may call a metal foreign object detection program stored in the memory 1005, and also perform the following operations:
the control switch is turned off to interrupt wireless charging and generate prompt information for displaying the existence of metal foreign matters and the cleaning requirement.
Further, the processor 1001 may call a metal foreign object detection program stored in the memory 1005, and also perform the following operations:
and if the mean square error is smaller than a preset threshold value, determining that the electromagnetic space of the wireless charging equipment does not contain metal foreign matters.
Further, the processor 1001 may call a metal foreign object detection program stored in the memory 1005, and also perform the following operations:
determining a receiving coil corresponding to the maximum output power;
and if the receiving coil corresponding to the maximum output power is not the innermost central coil, generating and displaying prompt information of the terminal misalignment and displacement suggestion.
Referring to fig. 2, fig. 2 is a schematic structural diagram of an embodiment of the receiving system of the present invention.
In the present embodiment, the receiving system includes a receiving module 10, a power detecting module 20, a control module 30 and a switch 40.
The receiving module 10 includes a plurality of receiving coils; the power detection module 20 is connected with the output end of the receiving module 10; the control module 30 is connected with the power detection module, and the control module includes a processor 31 and a power management unit 32, where the power management unit 32 is configured to store the electric energy received by the receiving system in a battery of the terminal; and the switch 40 is arranged between the receiving module and the control module. In the process of wirelessly charging the terminal by the wireless charging device, the processor 31 of the control module 30 may control the power detection module to detect the output power of each receiving coil in real time, and perform normalization processing on the output power of each receiving coil to obtain the quantized value of the output power of each receiving coil, perform mean square error operation on the quantized value of the output power of each receiving coil, and compare the mean square error obtained by the operation with a preset threshold; if the mean square error is greater than the preset threshold, it is determined that a metal foreign object exists in the electromagnetic space of the wireless charging device, and the processor 31 controls the switch 40 to be turned off to interrupt the wireless charging.
Further, the receiving module 10 includes a plurality of receiving coils, the plurality of receiving coils are connected in parallel, optionally, each receiving coil is a regular hexagon, and the plurality of receiving coils are arranged in a honeycomb manner from inside to outside, and the honeycomb arrangement manner can better utilize the electromagnetic space when the coils are energized.
The receiving system provided by the embodiment can realize the detection of the metal foreign matters by analyzing the symmetry of the output power distribution of the receiving system, has better effect and low complexity of a detection mechanism, is suitable for any power protocol, and has wider universality.
Based on the hardware structure, various embodiments of the metal foreign object detection method of the present invention are provided.
Referring to fig. 3, a first embodiment of a metallic foreign object detection method according to the present invention provides a metallic foreign object detection method applied to a wireless charging device including a receiving system including a plurality of receiving coils, the method including the steps of:
step S10, when detecting that the terminal is charged wirelessly, acquiring the output power of each receiving coil in real time, and carrying out normalization processing on the output power of each receiving coil to obtain the quantized value of the output power of each receiving coil;
step S20, performing mean square error operation on the quantized values of the output power of each receiving coil, and comparing the mean square error obtained by the operation with a preset threshold value;
step S30, if the mean square error is greater than a preset threshold, it is determined that a metal foreign object exists in the electromagnetic space of the wireless charging device.
The wireless charging device of this embodiment is composed of an energy transmitting system PTx and an energy receiving system PRx, and fig. 4 can be referred to fig. 4, where fig. 4 is a schematic structural framework diagram of the wireless charging device of this embodiment, where the receiving system PRx includes a receiving module, a power detecting module, a control module, and a switch. The receiving module comprises a plurality of receiving coils, and the input end of the receiving module is connected with the output end of the transmitting system PTx; the power detection module is connected with the output end of the receiving module and is used for detecting the output power of each receiving coil in real time; the control module comprises a processor and a power management unit, the processor is connected with the power detection module and used for executing a metal foreign matter detection program, and the power management unit is used for storing the electric energy received by the receiving system PRx into a battery of the terminal; the switch is arranged between the receiving module and the control module, and the processor can control the switch to start or interrupt the charging operation. The present embodiment can realize the detection of the metal foreign matter only by the receiving system PRx.
It should be noted that, the multiple receiving coils of the receiving system PRx are connected in parallel, and optionally, the multiple receiving coils are arranged in multiple layers from inside to outside, each receiving coil is in a regular hexagon, and taking 7 receiving coils as an example, the arrangement schematic diagram can refer to fig. 5, and this honeycomb arrangement mode can better utilize the electromagnetic space when the coils are energized.
In consideration of the fact that in practice, when no metal foreign object is inserted into the transmitting system, the output power difference of each receiving coil is small and has good symmetry, and when a metal foreign object is inserted into the transmitting system, the output power of the receiving coil corresponding to the metal foreign object is reduced, and the output power difference of each receiving coil is large, therefore, the embodiment performs mean square error analysis on the output power of each receiving coil to determine the symmetry of the output power distribution of each receiving coil, thereby realizing metal foreign object detection and being applicable to any power protocol.
The specific steps of the embodiment for realizing the detection of the metal foreign matter are described in detail as follows:
step S10, when detecting that the terminal is charged wirelessly, acquiring the output power of each receiving coil in real time, and carrying out normalization processing on the output power of each receiving coil to obtain the quantized value of the output power of each receiving coil;
in this embodiment, when the processor detects that the wireless charging device wirelessly charges the terminal, the processor controls the power detection module to detect the output power of each receiving coil in real time, and obtains the output power of each receiving coil from the power detection module in real time, and then normalizes the output power of each receiving coil, specifically, the step of normalizing the output power of each receiving coil to obtain the quantized value of the output power of each receiving coil includes:
comparing the output power of each receiving coil to determine the maximum output power;
and dividing the output power of each receiving coil by the maximum output power to obtain an output power quantized value of each receiving coil.
That is, the maximum output power is determined from the output power corresponding to each receiving coil, and then the output power corresponding to each receiving coil is divided by the maximum output power, so as to obtain the quantized value of the output power of each receiving coil. Taking 7 receiving coils as an example, the output power corresponding to the 7 receiving coils is P1、P2、P3、P4、P5、P6、P7Indicating that the maximum output power determined therefrom is PmaxDenotes that P is respectively1、P2、P3、P4、P5、P6、P7Divided by PmaxTo obtain the quantized values P of the output power of 7 receiving coils1a、P2a、P3a、P4a、P5a、P6a、P7a。
further, performing a mean square error operation on the quantized output power value of each receiving coil, specifically, the step of performing a mean square error operation on the quantized output power value of each receiving coil includes:
calculating an average value of the quantized output power values of the receiving coils;
and calculating the mean square error of the quantized output power value of each receiving coil by combining the average value.
That is, the average value of the quantized values of the output power of each receiving coil is calculated, and then the average value of the quantized values of the output power of each receiving coil is calculated by combining the calculated average valuesThe variance. Continuing with the example of 7 receiving coils, where Pm represents the average value of quantized output power values of each receiving coil, Pm＝(P1a+P2a+P3a+P4a+P5a+P6a+P7a) (iii)/7, with X the mean square error, then
And then, comparing the calculated mean square error with a preset threshold, wherein the preset threshold can be flexibly set according to a debugging result of an actual experiment, and the preset threshold is not limited herein.
Step S30, if the mean square error is greater than a preset threshold, it is determined that a metal foreign object exists in the electromagnetic space of the wireless charging device.
If the calculated mean square error is larger than the preset threshold, the distribution symmetry of the output power of each receiving coil is poor, and it can be determined that metal foreign matters exist in the coil coupling area of the receiving system PRx, namely the electromagnetic space of the wireless charging equipment.
Further, after step 20, the method further includes:
step S40, if the mean square error is smaller than a preset threshold, it is determined that the electromagnetic space of the wireless charging device does not contain a metallic foreign object.
If the calculated mean square error is smaller than the preset threshold, the distribution symmetry of the output power of each receiving coil is high, and it can be determined that the coil coupling area of the receiving system PRx, namely the electromagnetic space of the wireless charging device, is free of metal foreign matters.
Thus, the mode of the embodiment can be adopted to realize metal foreign matter detection under any power protocol.
Further, after the step of determining that a metal foreign object exists in the electromagnetic space of the wireless charging device if the mean square error is smaller than a preset threshold, the method includes:
the control switch is turned off to interrupt wireless charging and generate prompt information for displaying the existence of metal foreign matters and the cleaning requirement.
The wireless charging equipment further comprises a UI (user interface), after the electromagnetic space of the wireless charging equipment is determined to have the metal foreign matter, the processor control switch is switched off, wireless charging to the terminal is interrupted, prompt messages with the metal foreign matter and needing to be cleaned are generated and displayed on the UI, for example, a prompt box is popped up, so that a user is timely reminded to clean the terminal, charging operation of the user is prevented from being influenced, and user experience is improved.
Through the mode, the metal foreign matter detection can be realized only by analyzing the output power distribution of the receiving system PRx without combining the transmitting system PTx and the receiving system PRx, the effect is good, and the complexity of a detection mechanism is low.
The embodiment provides a metal foreign object detection method, which is applied to wireless charging equipment, wherein the wireless charging equipment comprises a receiving system, the receiving system comprises a plurality of receiving coils, and firstly, when the wireless charging of a terminal is detected, the output power of each receiving coil is obtained in real time, and the output power of each receiving coil is normalized to obtain the quantized value of the output power of each receiving coil; then, performing mean square error operation on the output power quantized values of the receiving coils, and comparing the mean square error obtained by the operation with a preset threshold value; if the calculated mean square error is larger than the preset threshold, it indicates that the symmetry of the output power distribution of each receiving coil of the receiving system is poor, and it is determined that a metal foreign object exists in the electromagnetic space of the wireless charging device, that is, in the coil coupling area.
Further, based on the first embodiment, a second embodiment of the metallic foreign object detection method of the present invention is provided, and is different from the foregoing embodiments in that, after the step of determining that the electromagnetic space of the wireless charging device is free of the metallic foreign object if the mean square deviation is smaller than a preset threshold, the method includes:
determining a receiving coil corresponding to the maximum output power;
and if the receiving coil corresponding to the maximum output power is not the innermost central coil, generating and displaying prompt information of the terminal misalignment and displacement suggestion.
The wireless charging device in this embodiment further has a function of correcting the placement position of the terminal. Specifically, if the calculated mean square error is smaller than a preset threshold, determining a receiving coil with the maximum output power from all receiving coils, then judging whether the receiving coil with the maximum output power is an innermost central coil, if not, generating prompt information of terminal misalignment and displacement suggestion according to the position of the receiving coil with the maximum output power, and displaying the prompt information on a UI (user interface) of the wireless charging equipment, wherein the displacement suggestion comprises a suggested position for placing the terminal and a direction prompt for moving to the suggested position, so that a user can place the terminal according to the displacement suggestion, loss is reduced, and wireless charging efficiency is improved. For example, referring to fig. 6, if the innermost center coil is coil No. 1 and the receiver coil of the maximum output power is coil No. 5, an arrow prompt as shown in fig. 6 is displayed on the UI interface of the wireless charging device.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A metal foreign object detection method is applied to a wireless charging device, the wireless charging device comprises a receiving system, the receiving system comprises a plurality of receiving coils, and the method comprises the following steps:
when the terminal is detected to be wirelessly charged, acquiring the output power of each receiving coil in real time, and carrying out normalization processing on the output power of each receiving coil to obtain the quantized value of the output power of each receiving coil;
performing mean square error operation on the output power quantized values of the receiving coils, and comparing the mean square error obtained by the operation with a preset threshold value;
and if the mean square error is larger than a preset threshold value, determining that a metal foreign matter exists in the electromagnetic space of the wireless charging equipment.
2. The method for detecting metallic foreign matter according to claim 1, wherein the step of normalizing the output power of each receiver coil to obtain a quantized value of the output power of each receiver coil comprises:
comparing the output power of each receiving coil to determine the maximum output power;
and dividing the output power of each receiving coil by the maximum output power to obtain an output power quantized value of each receiving coil.
3. The method for detecting metallic foreign matter according to claim 2, wherein the step of performing a mean square error operation on the quantized output power value of each receiving coil includes:
calculating an average value of the quantized output power values of the receiving coils;
and calculating the mean square error of the quantized output power value of each receiving coil by combining the average value.
4. The method for detecting metallic foreign objects according to claim 1, wherein the receiving system further includes a switch, and the step of determining that metallic foreign objects exist in the electromagnetic space of the wireless charging device after the step of determining that metallic foreign objects exist in the electromagnetic space of the wireless charging device if the mean square error is greater than a preset threshold value includes:
the control switch is turned off to interrupt wireless charging and generate prompt information for displaying the existence of metal foreign matters and the cleaning requirement.
5. The method for detecting metallic foreign objects according to claim 1, wherein after the step of comparing the calculated mean square error with a preset threshold, the method further comprises:
and if the mean square error is smaller than a preset threshold value, determining that the electromagnetic space of the wireless charging equipment does not contain metal foreign matters.
6. The metallic foreign object detection method according to claim 1, wherein the plurality of receiving coils are connected in parallel, each receiving coil is a regular hexagon, and the plurality of receiving coils are arranged in a honeycomb manner from the inside to the outside.
7. The method for detecting metallic foreign objects according to claim 6, wherein the step of determining that the electromagnetic space of the wireless charging device is free of metallic foreign objects if the mean square error is smaller than a preset threshold value comprises the following steps:
determining a receiving coil corresponding to the maximum output power;
and if the receiving coil corresponding to the maximum output power is not the innermost central coil, generating and displaying prompt information of the terminal misalignment and displacement suggestion.
8. A wireless charging device, comprising: a memory, a processor and a metallic foreign object detection program stored on the memory and executable on the processor, the metallic foreign object detection program when executed by the processor implementing the steps of the metallic foreign object detection method of any one of claims 1 to 7.
9. A receiving system, characterized in that the receiving system comprises:
a receive module comprising a plurality of receive coils;
the power detection module is connected with the output end of the receiving module and is used for detecting the output power of each receiving coil in real time;
the control module is connected with the power detection module and comprises a processor and a power management unit;
and the switch is arranged between the receiving module and the control module and used for starting or interrupting the charging operation.
10. The receiving system of claim 9, wherein the plurality of receiving coils are connected in parallel, each receiving coil is a regular hexagon, and the plurality of receiving coils are arranged in a honeycomb manner from the inside to the outside.
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| CN201910552011.3A CN112134373B (en) | 2019-06-24 | 2019-06-24 | Metal foreign matter detection method, wireless charging equipment and receiving system |
| PCT/CN2020/081476 WO2020258957A1 (en) | 2019-06-24 | 2020-03-26 | Metal foreign matter detection method, wireless charging device and receiving system |
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| CN201910552011.3A CN112134373B (en) | 2019-06-24 | 2019-06-24 | Metal foreign matter detection method, wireless charging equipment and receiving system |
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| CN117110423A (en) * | 2023-10-23 | 2023-11-24 | 沈阳仪表科学研究院有限公司 | Wireless nondestructive testing sensor |
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| CN114801796A (en) * | 2021-06-29 | 2022-07-29 | 长城汽车股份有限公司 | Vehicle-mounted wireless charging foreign matter alarm method and device, vehicle and computer readable storage medium |
| CN115091977B (en) * | 2022-06-30 | 2024-09-24 | 重庆长安汽车股份有限公司 | Charging prompt method and device, central control equipment, charging prompt system and vehicle |
| CN117565724B (en) * | 2023-10-12 | 2024-07-19 | 国网浙江省电力有限公司金华供电公司 | Method for identifying abnormal state of charging pile |
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| CN112134373B (en) | 2024-04-12 |
| WO2020258957A1 (en) | 2020-12-30 |
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