CN106412293B - Foreign matter detection method and device and terminal equipment - Google Patents

Abstract

The embodiments of the present invention disclose a foreign object detection method, a device and a terminal device, which are applied in the field of electronic technology. The method of the embodiment of the present invention includes: after starting the wireless charging function, acquiring an infrared thermal imaging image between the wireless power transmitting end and the wireless power receiving end; if there is an abnormal object in the infrared thermal imaging image, determining the abnormality of the abnormal object Whether the temperature value satisfies the preset rule; if the temperature value of the abnormal object satisfies the preset rule, send a wireless charging termination instruction to the wireless power transmitter, and the wireless charging termination instruction is used to instruct the wireless power The transmitter terminates wireless charging. By implementing the embodiments of the present invention, the accuracy of foreign object detection in the wireless charging process can be improved, thereby improving the safety in the wireless charging process.

Description

A foreign object detection method, device and terminal equipment

technical field

The present invention relates to the field of electronic technology, and in particular, to a foreign object detection method, device and terminal equipment.

Background technique

With the popularization of terminal devices such as smart phones, in order to realize the purpose of charging smart phones anytime and anywhere, a short-range wireless charging technology has emerged as the times require. The wireless charging technology transmits electric energy through the coupling of the transmitting coil and the receiving coil. The wireless charger can be called the electric energy transmitting end, or TX for short; the mobile phone with the wireless charging function is called the electric energy receiving end, or RX for short. When the TX end is charging the RX end, when metal objects such as coins and keys are also placed on the TX end sending coil, the metal objects will absorb electrical energy and heat up. For the sake of safety and energy saving, a foreign object detection algorithm (Foreign Object Detection , FOD).

At present, it is mainly through the detection of magnetoresistance at the TX end or the RX end to determine whether there is a metal substance, and then to decide whether to continue the wireless charging transmission. However, in actual use, it is found that due to the high correlation between wireless charging efficiency and position, there will be a large magnetic resistance when the position is not aligned. When the charging position is slightly deviated, the system will misjudge the existence of metal foreign objects. This leads to unstable charging, and if there is a small metal object between the TX and RX terminals before charging, there is no magnetic resistance change at all during wireless charging, and when the foreign object detection threshold of the system is not reached, the system will also judge it as There are no metal foreign objects, thereby reducing the accuracy of foreign object detection, thereby increasing safety hazards.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a foreign object detection method, device and terminal device, which can improve the accuracy of foreign object detection in a wireless charging process, thereby improving the safety in the wireless charging process.

A first aspect of the embodiments of the present invention discloses a foreign body detection method, including:

After starting the wireless charging function, obtain the infrared thermal imaging image between the wireless power transmitter and the wireless power receiver;

If there is an abnormal object in the infrared thermal imaging image, determine whether the temperature value of the abnormal object satisfies a preset rule;

If the temperature value of the abnormal object satisfies the preset rule, a wireless charging termination instruction is sent to the wireless power transmitter, where the wireless charging termination instruction is used to instruct the wireless power transmitter to terminate wireless charging.

As an optional implementation manner, before judging whether the temperature value of the abnormal object satisfies a preset rule if there is an abnormal object in the infrared thermal imaging image, the method further includes:

comparing the infrared thermal imaging image with a preset image;

According to the comparison result, it is determined whether there is an abnormal object in the infrared thermal imaging image.

As an optional implementation manner, the comparing the infrared thermal imaging image with the preset image includes:

acquiring an image of the difference between the infrared thermal imaging image and the preset image;

The determining whether there is an abnormal object in the infrared thermal imaging image according to the comparison result includes:

According to the image of the distinguishing part, it is determined whether there is an abnormal object in the infrared thermal imaging image.

As an optional implementation manner, the judging whether the temperature value of the abnormal object satisfies a preset rule includes:

judging whether the temperature value of the abnormal object exceeds a first preset temperature threshold;

Or, it is determined whether the temperature change value of the abnormal object exceeds a second preset threshold within a preset time.

As an optional embodiment, the method further includes:

If there is no abnormal object in the infrared thermal imaging image, or the temperature value of the abnormal object does not meet the preset rule, the charging state between the wireless power transmitting end and the wireless power receiving end is maintained , and perform the acquisition of the infrared thermal imaging image between the wireless power transmitting end and the wireless power receiving end.

A second aspect of the embodiment of the present invention discloses a foreign object detection device, comprising:

an acquisition unit, used for acquiring the infrared thermal imaging image between the wireless power transmitter and the wireless power receiver after the wireless charging function is activated;

a first judging unit, configured to judge whether the temperature value of the abnormal object satisfies a preset rule when there is an abnormal object in the infrared thermal imaging image;

a sending unit, configured to send a wireless charging termination instruction to the wireless power transmitter when the temperature value of the abnormal object satisfies the preset rule, where the wireless charging termination instruction is used to instruct the wireless power transmitter to terminate Wireless charging.

As an optional implementation manner, the device further includes:

a comparison unit, configured to compare the infrared thermal imaging image with a preset image;

The second judgment unit is configured to judge whether there is an abnormal object in the infrared thermal imaging image according to the comparison result.

As an optional implementation,

The comparison unit is specifically configured to acquire the image of the difference part between the infrared thermal imaging image and the preset image, and drive the second judgment unit to judge the infrared thermal image according to the image of the difference part. The presence or absence of abnormal objects in the imaging image.

As an optional implementation,

The first judgment unit is specifically configured to judge whether the temperature value of the abnormal object exceeds a first preset temperature threshold;

or,

The first judging unit is specifically configured to judge whether the temperature change value of the abnormal object exceeds a second preset threshold within a preset time.

As an optional implementation manner, the device further includes:

A charging maintenance unit for maintaining the wireless power transmitting end and the wireless power receiving end when there is no abnormal object in the infrared thermal imaging image, or when the temperature value of the abnormal object does not meet the preset rule The charging state between the terminals is performed, and the acquisition of the infrared thermal imaging image between the wireless power transmitting terminal and the wireless power receiving terminal is performed.

A third aspect of the embodiments of the present invention discloses a terminal device, including the foreign object detection apparatus described in any one of the foregoing.

It can be seen from the above technical solutions that the embodiments of the present invention have the following advantages: by acquiring the infrared thermal imaging image between the wireless power transmitting end and the wireless power receiving end during the wireless charging process, it can be determined whether there is an abnormal object, and the wireless power When there is an abnormal object between the transmitting end and the wireless power receiving end, determine whether the temperature value of the abnormal object satisfies the preset rule; then when the temperature value of the abnormal object satisfies the preset rule, send a wireless charging termination instruction to the wireless power transmitting end, Terminate the wireless charging process. By implementing the embodiments of the present invention, abnormal objects and their temperature values can be accurately determined through infrared thermal images, the accuracy of foreign object detection during wireless charging can be improved, and the safety during wireless charging can be improved.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

1 is a schematic flowchart of a foreign body detection method disclosed in an embodiment of the present invention;

2 is a schematic flowchart of another foreign body detection method disclosed in an embodiment of the present invention;

3 is a schematic structural diagram of a foreign object detection device disclosed in an embodiment of the present invention;

4 is a schematic structural diagram of another foreign object detection device disclosed in an embodiment of the present invention;

5 is a schematic structural diagram of another foreign object detection device disclosed in an embodiment of the present invention;

6 is a schematic structural diagram of a terminal device disclosed in an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a foreign object detection system disclosed in an embodiment of the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. . Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish different objects, rather than to describe a specific order. Furthermore, the term "comprising" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally also includes For other steps or units inherent to these processes, methods, products or devices.

In this embodiment of the present invention, the terminal device may include a terminal device running an Android operating system, an iOS operating system, a Windows operating system, or other operating systems, such as a mobile phone, a mobile computer, a tablet computer, a desktop computer, a Personal Digital Assistant (PDA) , PDA), smart watches, smart glasses, smart bracelets and other terminal devices, the embodiments of the present invention will not be repeated later.

Embodiments of the present invention provide a foreign object detection method, device and terminal device, which can improve the accuracy of foreign object detection in a wireless charging process, thereby improving the safety in the wireless charging process. Each of them will be described in detail below.

Please refer to FIG. 1 . FIG. 1 is a schematic flowchart of a foreign object detection method disclosed in an embodiment of the present invention. Wherein, the foreign body detection method shown in FIG. 1 may comprise the following steps:

101: After starting the wireless charging function, obtain an infrared thermal imaging image between the wireless power transmitting end and the wireless power receiving end;

In the embodiment of the present invention, based on the introduction of the background technology, it can be known that the current wireless charging technology transmits electric energy through the coupling of the transmitting coil and the receiving coil, and the wireless charger can be called the electric energy transmitting end, abbreviated as TX; It is called the power receiving end, or RX for short. In the process of wireless charging, electric energy will be generated between the wireless power transmitting end and the wireless power receiving end due to the magnetic field effect.

As an optional implementation manner, an infrared thermal imaging image between the wireless power transmitting end and the wireless power receiving end may be acquired through an infrared thermal imaging sensor.

102: If there is an abnormal object in the above-mentioned infrared thermal imaging image, determine whether the temperature value of the above-mentioned abnormal object satisfies a preset rule;

In the embodiment of the present invention, it can be determined whether there is an abnormal object in the infrared thermal imaging image by comparing the infrared thermal imaging image with a preset image, wherein the preset image can be at the wireless power transmitting end and the wireless power receiving end Images taken when there are no unusual objects in between.

In the embodiment of the present invention, judging whether the temperature value of the abnormal object satisfies the preset rule may include the following steps:

judging whether the temperature value of the abnormal object exceeds a first preset temperature threshold;

Or, it is determined whether the temperature change value of the abnormal object exceeds a second preset threshold within a preset time.

Among them, if there is an abnormal object between the wireless power transmitting end and the wireless power receiving end, the abnormal object will absorb electric energy and generate heat, so it can be determined whether the temperature value of the abnormal object exceeds the first preset temperature through the captured infrared thermal image. threshold value, or determine whether the temperature value of the abnormal object changes sharply, that is, determine whether the temperature change value of the abnormal object exceeds the second preset threshold value within the preset time.

103: If the temperature value of the abnormal object satisfies the preset rule, send a wireless charging termination instruction to the wireless power transmitter, where the wireless charging termination instruction is used to instruct the wireless power transmitter to terminate wireless charging.

In the embodiment of the present invention, if the temperature value of the abnormal body satisfies the preset rule, it indicates that there is an abnormal object between the wireless power transmitting end and the wireless power receiving end, and the existence of the abnormal object may cause safety hazards, so the wireless power transmission can be transmitted to the wireless power. The terminal sends a wireless charging termination instruction, which is used to instruct the wireless power transmitter to terminate the wireless charging, so as to ensure the safety in the charging process.

In the method described in Figure 1, by acquiring the infrared thermal imaging image between the wireless power transmitting end and the wireless power receiving end during the wireless charging process, it is determined whether there is any abnormal object, and the wireless power transmitting end and the wireless power receiving end are When there is an abnormal object between, it is judged whether the temperature value of the abnormal object satisfies the preset rule; then when the temperature value of the abnormal object satisfies the preset rule, a wireless charging termination instruction is sent to the wireless power transmitter to terminate the wireless charging process. By implementing the embodiments of the present invention, abnormal objects and their temperature values can be accurately determined through infrared thermal images, the accuracy of foreign object detection during wireless charging can be improved, and the safety during wireless charging can be improved.

Further, please refer to FIG. 2 , which is a schematic flowchart of another foreign object detection method disclosed in an embodiment of the present invention. As shown in Figure 2, the method may include the following steps:

201: Start the wireless charging function;

202: Acquire an infrared thermal imaging image between the wireless power transmitter and the wireless power receiver;

203: Compare the above-mentioned infrared thermal imaging image with a preset image;

204: Determine whether there is an abnormal object in the above-mentioned infrared thermal imaging image according to the result of the above-mentioned comparison;

As an optional implementation manner, whether there is an abnormal object in the infrared thermal imaging image can be determined in the following manner:

acquiring an image of the difference between the above-mentioned infrared thermal imaging image and the above-mentioned preset image;

Determine whether there is any abnormal object in the above infrared thermal imaging image according to the image of the above difference part.

205: If there is an abnormal object in the above-mentioned infrared thermal imaging image, determine whether the temperature value of the above-mentioned abnormal object satisfies a preset rule;

As an optional implementation manner, judging whether the temperature value of the abnormal object satisfies a preset rule may include the following steps:

judging whether the temperature value of the abnormal object exceeds a first preset temperature threshold;

Or, it is determined whether the temperature change value of the abnormal object exceeds a second preset threshold within a preset time.

Among them, the temperature value of the abnormal object can be determined by the temperature field of the object surface reflected in the infrared thermal imaging image.

206: If the temperature value of the abnormal object satisfies the preset rule, send a wireless charging termination instruction to the wireless power transmitter, where the wireless charging termination instruction is used to instruct the wireless power transmitter to terminate wireless charging;

207: If there is no abnormal object in the above-mentioned infrared thermal imaging image, or, if the temperature value of the above-mentioned abnormal object does not meet the above-mentioned preset rule, keep the charging state between the above-mentioned wireless power transmitting end and the above-mentioned wireless power receiving end, and execute Step 202.

In the embodiment of the present invention, if there is no abnormal object in the infrared thermal imaging image, or the temperature value of the abnormal object does not meet the above preset rules, the normal charging state between the wireless power transmitting end and the wireless power receiving end is maintained , and continue to perform step 202 of acquiring an infrared thermal imaging image between the wireless power transmitting end and the wireless power receiving end, and monitor in real time whether there is an abnormal body between the wireless power transmitting end and the wireless power receiving end.

In the method described in Figure 2, by acquiring the infrared thermal imaging image between the wireless power transmitter and the wireless power receiver during the wireless charging process, it is determined whether there is any abnormal object, and the wireless power transmitter and the wireless power receiver are connected to the wireless power receiver. When there is an abnormal object between, it is judged whether the temperature value of the abnormal object satisfies the preset rule; then when the temperature value of the abnormal object satisfies the preset rule, a wireless charging termination instruction is sent to the wireless power transmitter to terminate the wireless charging process. Through infrared thermal images, abnormal objects and their temperature values can be accurately determined, which can improve the accuracy of foreign object detection in the wireless charging process, thereby improving the safety in the wireless charging process. Further, when there is no abnormal object in the above-mentioned infrared thermal imaging image, or, when the temperature value of the above-mentioned abnormal object does not meet the above-mentioned preset rule, maintain the normal charging state between the wireless power transmitting end and the wireless power receiving end, and continue. Execute the acquisition of infrared thermal imaging images between the wireless power transmitter and the wireless power receiver, and monitor the wireless charging process in real time.

Please refer to FIG. 3 , which is a schematic structural diagram of a foreign object detection device disclosed in an embodiment of the present invention. As shown in Figure 3, the device may include:

an acquisition unit 301, configured to acquire an infrared thermal imaging image between the wireless power transmitting end and the wireless power receiving end after the wireless charging function is activated;

The first judgment unit 302 is configured to judge whether the temperature value of the abnormal object satisfies a preset rule when there is an abnormal object in the infrared thermal imaging image;

The sending unit 303 is configured to send a wireless charging termination instruction to the wireless power transmitter when the temperature value of the abnormal object satisfies the preset rule, where the wireless charging termination instruction is used to instruct the wireless power transmitter to terminate wireless charging.

In this embodiment of the present invention, for the specific implementation of each functional unit, reference may be made to the description in Method Embodiment 1, which will not be repeated in this embodiment of the present invention.

In the embodiment of the present invention, the infrared thermal imaging image between the wireless power transmitting end and the wireless power receiving end is obtained by the obtaining unit 301 during the wireless charging process, and the first judging unit 302 is used to obtain the infrared thermal imaging image between the wireless power transmitting end and the wireless power receiving end. When there is an abnormal object in between, it is judged whether the temperature value of the abnormal object satisfies the preset rule; when the temperature value of the abnormal object satisfies the preset rule, the sending unit 303 sends a wireless charging termination instruction to the wireless power transmitter to terminate the wireless charging process. The accuracy of foreign object detection in the wireless charging process can be improved, thereby improving the safety in the wireless charging process.

Please refer to FIG. 4 together. FIG. 4 is a schematic structural diagram of another foreign object detection apparatus disclosed in an embodiment of the present invention. Wherein, the device shown in FIG. 4 is obtained by optimizing the device shown in FIG. 3 . Compared with the device shown in FIG. 3 , the device shown in FIG. 4 further includes:

A comparison unit 304, configured to compare the above-mentioned infrared thermal imaging image with a preset image;

The second judging unit 305 is configured to judge whether there is an abnormal object in the above-mentioned infrared thermal imaging image according to the result of the above-mentioned comparison.

As an optional implementation manner, the above-mentioned comparison unit 304 is specifically configured to acquire the image of the difference part between the above-mentioned infrared thermal imaging image and the above-mentioned preset image, and drive the above-mentioned second judgment unit 305 according to the above-mentioned difference part of the image. The image determines whether there is an abnormal object in the above infrared thermal imaging image.

As an optional implementation manner, in the device shown in FIG. 4 , the above-mentioned first judgment unit 302 is specifically configured to judge whether the temperature value of the above-mentioned abnormal object exceeds a first preset temperature threshold;

or,

The above-mentioned first determining unit 302 is specifically configured to determine whether the temperature change value of the above-mentioned abnormal object exceeds a second predetermined threshold value within a preset time.

Optionally, in the foreign object detection device shown in FIG. 4 , the device further includes:

The charging maintenance unit 306 is used for maintaining the above-mentioned wireless power transmitting end and the above-mentioned wireless power receiving end when there is no abnormal object in the above-mentioned infrared thermal imaging image, or when the temperature value of the above-mentioned abnormal object does not meet the above-mentioned preset rule. the charging state, and drive the acquisition unit 301 to acquire the infrared thermal imaging image between the wireless power transmitting end and the wireless power receiving end.

Referring to FIG. 5, another foreign object detection device is provided, and the foreign object detection device has a wireless communication function, such as radio frequency, bluetooth or infrared communication function. The apparatus includes a processor 501 , a memory 502 , and an infrared camera 503 .

The processor 501 executes program codes pre-stored in the memory 502 to perform the following steps:

After the wireless charging function is activated, the infrared thermal imaging image between the wireless power transmitting end and the wireless power receiving end is obtained through the infrared camera 503;

If there is an abnormal object in the above-mentioned infrared thermal imaging image, determine whether the temperature value of the above-mentioned abnormal object satisfies a preset rule;

If the temperature value of the abnormal object satisfies the preset rule, a wireless charging termination instruction is sent to the wireless power transmitter, and the wireless charging termination instruction is used to instruct the wireless power transmitter to terminate wireless charging.

As an optional implementation manner, the processor 501 executes the program code pre-stored in the memory 502, and if there is an abnormal object in the infrared thermal imaging image, before judging whether the temperature value of the abnormal object satisfies the preset rule, Also used to do the following:

comparing the above-mentioned infrared thermal imaging image with a preset image;

According to the result of the above comparison, it is determined whether there is an abnormal object in the above infrared thermal imaging image.

As an optional implementation manner, the processor 501 executes the program code pre-stored in the memory 502, and compares the above-mentioned infrared thermal imaging image with the preset image, specifically for performing the following operations:

acquiring an image of the difference between the above-mentioned infrared thermal imaging image and the above-mentioned preset image;

The above judgment according to the result of the above comparison to determine whether there is an abnormal object in the above infrared thermal imaging image is specifically used to perform the following operations:

Determine whether there is any abnormal object in the above infrared thermal imaging image according to the image of the above difference part.

As an optional implementation manner, the processor 501 executes the program code pre-stored in the memory 502 to determine whether the temperature value of the abnormal object satisfies the preset rule, and is specifically configured to perform the following operations:

judging whether the temperature value of the abnormal object exceeds a first preset temperature threshold;

Or, it is determined whether the temperature change value of the abnormal object exceeds a second preset threshold within a preset time.

As an optional implementation manner, the processor 501 executes program codes pre-stored in the memory 502, and is further configured to perform the following operations:

If there is no abnormal object in the infrared thermal imaging image, or if the temperature value of the abnormal object does not meet the above preset rules, the charging state between the wireless power transmitting end and the wireless power receiving end is maintained, and the above acquisition is performed. Infrared thermal imaging image between wireless power transmitter and wireless power receiver.

Please refer to FIG. 6 . FIG. 6 is a schematic structural diagram of a terminal device disclosed in an embodiment of the present invention. As shown in FIG. 6 , the terminal device may include: the foreign object detection apparatus 601 provided in FIGS. 3 to 5 , and a processor unit 602 , storage unit 603 and other components. These components communicate over one or more buses. Those skilled in the art can understand that the structure of the terminal device shown in FIG. 6 does not constitute a limitation of the present invention, and it can be either a bus-type structure or a star-type structure, and can also include more structures than the structure shown in FIG. 6 . More or fewer components, or a combination of certain components, or a different arrangement of components. In an embodiment of the present invention, the terminal device shown in FIG. 6 includes, but is not limited to, various terminal devices such as a mobile phone, a mobile computer, a tablet computer, and a personal digital assistant (Personal Digital Assistant, PDA).

The processor unit 602 is the control center of the terminal device, uses various interfaces and lines to connect various parts of the entire terminal device, runs or executes the program codes and/or modules stored in the storage unit 603, and calls the stored in the storage unit 603. data in order to perform various functions of the terminal device and/or process data. The processor unit 602 may be composed of an integrated circuit (Integrated Circuit, IC for short), for example, may be composed of a single packaged IC, or may be composed of a plurality of packaged ICs connected with the same function or different functions. For example, the processor unit 602 may only include a central processing unit (Central Processing Unit, referred to as CPU), or may be a CPU, a digital signal processor (digital signal processor, referred to as DSP), a graphics processor (Graphic Processing Unit, referred to as GPU) And the combination of the control chip (eg baseband chip) in the communication unit. In the embodiment of the present invention, the CPU may be a single computing core, or may include multiple computing cores.

The storage unit 603 may be used to store program codes and modules, and the processor unit 602 executes various functional applications of the terminal device and implements data processing by running the program codes and modules stored in the storage unit 603 . The storage unit 603 mainly includes a program storage area and a data storage area, wherein the program storage area can store the operating system and the program code required for at least one function; the data storage area can store data (such as audio data) created according to the use of the terminal device. , phone book, etc.) etc. In a specific embodiment of the present invention, the storage unit 603 may include a volatile memory, such as a non-volatile dynamic random access memory (Nonvolatile RandomAccess Memory, NVRAM for short), a phase change random access memory (Phase Change RAM, PRAM for short) , Magnetoresistive Random Access Memory (Magetoresistive RAM, MRAM for short), etc., and may also include non-volatile memory, such as at least one disk storage device, Electronically Erasable Programmable Read-Only Memory (Electrically Erasable Programmable Read-Only Memory, referred to as EEPROM), flash memory devices such as NOR flash memory or NAND flash memory. The non-volatile memory stores the operating system and program codes executed by the processor unit 602 . Processor unit 602 loads operating programs and data from non-volatile memory into memory and stores digital content in mass storage. The operating system includes various components and/or drivers for controlling and managing general system tasks, such as memory management, storage device control, power management, etc., as well as facilitating communication between various hardware and software. In the embodiment of the present invention, the operating system may be the Android system of Google, the iOS system developed by Apple, the Windows operating system developed by Microsoft, etc., or an embedded operating system such as Vxworks.

The processor unit 602 executes the program codes pre-stored in the storage unit 603 to control the foreign object detection device 601 to perform the steps in the above method embodiments, and the processor unit 602 is also configured to receive feedback from the foreign object detection device 601. The wireless charging termination signal terminates the wireless charging process.

It should be noted that the terminal device shown in FIG. 6 only indicates the components in the terminal device that are required to execute the foreign object detection method disclosed in the embodiment of the present invention, and other components that the terminal device can have are not marked in the embodiment of the present invention. Because this does not affect the implementation of the embodiments of the present invention.

An embodiment of the present invention further provides a foreign object detection system, as shown in FIG. 7 , including a wireless transmitting module 701 , an image processing module 702 , a transmitting coil 703 and an infrared camera 704 . Among them, the transmitting coil 703 is used to transmit energy or receive energy during the wireless charging process, and the infrared camera 704 is located in the hollow position of the transmitting coil 703, and is used to obtain the infrared thermal imaging image between the wireless power transmitting end and the wireless power receiving end. The processing module 702 is used to process the above-mentioned infrared thermal imaging images, determine whether there is an abnormal object between the wireless power transmitter and the wireless power receiver, and transmit instructions through the wireless transmitter module 701 according to the judgment result to terminate the wireless charging process or maintain the wireless power. charging process.

It is worth noting that in the above-mentioned embodiments of the foreign object detection device and the terminal equipment, the units included are only divided according to functional logic, but are not limited to the above-mentioned division, as long as the corresponding functions can be realized; in addition, The specific names of the functional units are only for the convenience of distinguishing from each other, and are not used to limit the protection scope of the present invention.

In the above-mentioned embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

In addition, those of ordinary skill in the art can understand that all or part of the steps in the above method embodiments can be implemented by instructing relevant hardware through a program, and the corresponding program can be stored in a computer-readable storage medium. The storage medium can be read-only memory, magnetic disk or optical disk, etc.

The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the embodiments of the present invention. , all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (9)

1. A foreign object detection method, comprising:

after a wireless charging function is started, acquiring an infrared thermal imaging image between a wireless power transmitting end and a wireless power receiving end;

comparing the infrared thermal imaging image with a preset image, wherein the preset image is a picture shot when no abnormal object exists between the wireless power transmitting end and the wireless power receiving end;

judging whether an abnormal object exists in the infrared thermal imaging image according to the comparison result;

if an abnormal object exists in the infrared thermal imaging image, judging whether the temperature value of the abnormal object meets a preset rule or not;

if the temperature value of the abnormal object meets the preset rule, sending a wireless charging termination instruction to the wireless power transmitting terminal, wherein the wireless charging termination instruction is used for indicating the wireless power transmitting terminal to terminate wireless charging.

2. The method of claim 1, wherein comparing the infrared thermographic image to a predetermined image comprises:

acquiring images of a difference part between the infrared thermal imaging image and the preset image;

the judging whether the abnormal object exists in the infrared thermal imaging image according to the comparison result comprises the following steps:

and judging whether an abnormal object exists in the infrared thermal imaging image according to the image of the distinguishing part.

3. The method according to claim 1, wherein the determining whether the temperature value of the abnormal object satisfies a preset rule comprises:

judging whether the temperature value of the abnormal object exceeds a first preset temperature threshold value or not;

or judging whether the temperature change value of the abnormal object exceeds a second preset threshold value within preset time.

4. A method according to any one of claims 1 to 3, characterized in that the method further comprises:

if no abnormal object exists in the infrared thermal imaging image, or the temperature value of the abnormal object does not meet the preset rule, keeping the charging state between the wireless power transmitting end and the wireless power receiving end, and executing the acquisition of the infrared thermal imaging image between the wireless power transmitting end and the wireless power receiving end.

5. A foreign matter detection device, characterized by comprising:

the wireless charging device comprises an acquisition unit, a wireless power transmitting terminal and a wireless power receiving terminal, wherein the acquisition unit is used for acquiring an infrared thermal imaging image between the wireless power transmitting terminal and the wireless power receiving terminal after a wireless charging function is started;

a comparison unit, configured to compare the infrared thermal imaging image with a preset image, where the preset image is a picture that is taken when there is no abnormal object between the wireless power transmitting end and the wireless power receiving end;

the first judging unit is used for judging whether an abnormal object exists in the infrared thermal imaging image according to the comparison result and judging whether the temperature value of the abnormal object meets a preset rule or not when the abnormal object exists in the infrared thermal imaging image;

and the sending unit is used for sending a wireless charging termination instruction to the wireless power transmitting terminal when the temperature value of the abnormal object meets the preset rule, wherein the wireless charging termination instruction is used for indicating the wireless power transmitting terminal to terminate wireless charging.

6. The apparatus of claim 5,

the comparison unit is specifically configured to acquire an image of a difference portion between the infrared thermal imaging image and the preset image, and drive the second determination unit to determine whether an abnormal object exists in the infrared thermal imaging image according to the image of the difference portion.

7. The apparatus of claim 5,

the first judging unit is specifically configured to judge whether the temperature value of the abnormal object exceeds a first preset temperature threshold;

or,

the first judging unit is specifically configured to judge whether the temperature change value of the abnormal object exceeds a second preset threshold within a preset time.

8. The apparatus of any one of claims 5 to 7, further comprising:

and a charging maintaining unit, configured to maintain a charging state between the wireless power transmitting terminal and the wireless power receiving terminal when no abnormal object exists in the infrared thermal imaging image or a temperature value of the abnormal object does not satisfy the preset rule, and perform the acquiring of the infrared thermal imaging image between the wireless power transmitting terminal and the wireless power receiving terminal.

9. A terminal device, characterized in that the terminal device comprises the foreign matter detection apparatus according to any one of claims 5 to 8.

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