Wireless communication system and method with foreign matter detection and anti-interference functions

Abstract

In order to solve the technical problems that an existing wireless communication system based on magnetic coupling needs to be additionally provided with a foreign matter detection unit, so that the system is complex, the cost is high, the dynamic adjustment capability is lacked and the anti-interference performance is poor, the invention provides a wireless communication system and method with foreign matter detection and anti-interference functions. Impedance data of the transmitting coil module are used for foreign matter detection, detected foreign matter distribution information is coded into binary codes to be embedded into communication frames to be transmitted together with the communication frames, and data interaction delay among functional units is eliminated; the working mode switching module predicts the working mode of the wireless communication system at the next moment in real time based on the detected foreign matter distribution data, the actually measured energy efficiency ratio and the channel quality data, and triggers the current regulation and control unit to perform cooperative control on each coil unit of the transmitting coil module when the anti-interference mode needs to be started. And foreign matter detection and efficient information anti-interference transmission are synchronously realized.

Description

Technical Field

[0001] The present invention relates to the fields of power supply circuit systems and electrical communication technologies. Background Art

[0002] Wireless communication systems based on magnetic coupling are widely used and have advantages such as high efficiency and low power consumption. However, the existing wireless communication systems based on magnetic coupling have the following deficiencies in actual applications:

[0003] 1. A wireless communication system based on magnetic coupling includes a wireless communication transmitting device and a wireless communication receiving device. As Figure 1 shown, in actual use, foreign objects such as metal objects and / or other magnetic materials may exist in the magnetic fields of the wireless communication transmitting device and the wireless communication receiving device, affecting the transmission performance of the wireless communication system and possibly causing a fire in severe cases. Therefore, existing wireless communication systems usually need to be provided with a foreign object detection unit for detecting whether there are foreign objects in the magnetic field, so as to timely discover and remove foreign objects, resulting in a higher complexity, production, and maintenance cost of the entire wireless communication system based on magnetic coupling. Moreover, when performing foreign object detection, foreign object detection and information transmission need to share the same coil, and a time-division multiplexing mechanism is adopted, which will lead to an increase in communication response delay and a decrease in the utilization rate of the coil (the effective working time of the coil).

[0004] 2. Existing wireless communication systems based on magnetic coupling often adopt fixed current distribution parameters and operating frequencies, lacking the ability of dynamic adjustment in the face of complex electromagnetic environment changes, and being particularly vulnerable to interference in multi-device scenarios. Summary of the Invention

[0005] In order to solve the technical problems that the existing wireless communication systems based on magnetic coupling need to be additionally provided with a foreign object detection unit, resulting in a complex system and high cost, as well as lacking the ability of dynamic adjustment and having poor anti-interference performance, the present invention provides a wireless communication system and method with foreign object detection and anti-interference functions.

[0006] The technical solution of the present invention is as follows:

[0007] A wireless communication system with foreign object detection and anti-interference functions, including a wireless communication transmitting device and a wireless communication receiving device; the special feature is that the wireless communication transmitting device includes:

[0008] The transmitting coil module includes s layers of planar coil layers arranged in parallel up and down. Each planar coil layer is an m×n coil array composed of multiple coil units evenly distributed. Each coil unit is a p×p coil array composed of multiple single-layer coils evenly distributed. s, m, n are determined by electromagnetic simulation software or sample testing according to the communication distance, magnetic field coverage range, and power requirements. All the single-layer coils in the same coil unit are connected in series, and the polarities of adjacent single-layer coils are opposite. In the same planar coil layer, the polarities of adjacent single-layer coils that do not belong to the same coil unit are opposite. In two adjacent planar coil layers, two coil units with the same number of rows and columns are staggered and have an overlapping area. All the coil units are connected in parallel.

[0009] The foreign object detection unit is used to collect the impedance data of the coil units and process it to obtain the foreign object distribution information. The foreign object distribution information is the layer number and row and column numbers of the coil unit where the impedance parameter change caused by the foreign object is the largest.

[0010] The current regulation unit generates a current regulation instruction using a current regulation algorithm according to the impedance data, foreign object distribution information output by the foreign object detection unit, and the channel quality data from the wireless communication receiving device. The current regulation instruction is used to control the multi-way switch matrix and the programmable current source in the current regulation unit to regulate the on-off, current amplitude, phase difference, and operating frequency of the coil units, so as to achieve: stopping the current supply of the coil units affected by foreign objects, and increasing the current amplitude of the coil units in the adjacent layer that correspond to the row and column positions of the coil unit with the stopped current supply and are staggered, and adjusting the current phase difference to 180°. After each regulation, the current regulation unit also needs to obtain the measured energy efficiency ratio. If the measured energy efficiency ratio is less than the target energy efficiency ratio, the current regulation algorithm is used to regenerate the current regulation instruction.

[0011] The working mode switching unit predicts and switches the working mode of the wireless communication system at the next moment according to the current foreign object distribution information, the measured energy efficiency ratio, the channel quality data, and a mode prediction algorithm. The working modes include the detection and anti-interference mode and the transmission mode.

[0012] The communication coordination unit is used to realize the data interaction between the wireless communication transmitting device and the wireless communication receiving device, and is responsible for relaying the data between the foreign object detection unit, the current regulation unit, the working mode switching unit, and the heat dissipation management unit to realize data interaction.

[0013] The heat dissipation management unit is used to collect the temperature data of each area in the transmitting coil module in real time. When the collected temperature exceeds the preset temperature threshold, the heat dissipation device is started for cooling.

[0014] Further, the current regulation algorithm is a reinforcement learning decision model. The input is the impedance data of the coil units, the foreign object distribution information, and the channel quality data. The optimization objective is the energy efficiency ratio, and the output is the optimal coil unit current distribution strategy and the working frequency adjustment parameter. The coil unit current distribution strategy refers to a scheme for dynamically adjusting the current parameters of each coil unit according to the optimization objective, including current amplitude adjustment, phase difference control, and the on / off commands of the coil units.

[0015] Further, the current regulation algorithm is a PID control algorithm. The input is the error between the actual value and the expected value of the coil impedance, the error between the actual value and the expected value of the signal-to-noise ratio feedback by the wireless communication receiving device, and the error between the actual value of the bit error rate and the acceptable threshold. The output is the control signal after proportional, integral, and differential regulation, including the coil impedance adjustment signal, the signal-to-noise ratio optimization control signal, and the bit error rate control signal.

[0016] Further, the current regulation algorithm is a genetic algorithm. The input is the impedance data of the coil units, the foreign object distribution information, and the channel quality parameters. The output is the global optimal coil unit current distribution strategy and the working frequency adjustment parameter of the wireless communication system.

[0017] Further, the foreign object detection unit includes a data acquisition module, a data processing module, and a first communication interface module. The data acquisition module collects the impedance data of each coil unit and sends it to the data processing module. The data processing module first extracts the abnormal frequency band from the impedance data through FFT, and then fits the abnormal frequency band by the least squares method to obtain the foreign object distribution information. The first communication interface module encodes the foreign object distribution information into binary data in the format of layer number - row number - column number and embeds it in the communication frame for transmission.

[0018] Further, the heat dissipation management unit adopts a hierarchical cooling strategy:

[0019] When the temperature difference between a certain area and the preset temperature threshold is less than 10% of the temperature threshold, the heat dissipation management unit sends a signal to the current regulation unit to request reducing the current amplitude of the coil units in this area.

[0020] When the temperature difference between a certain area and the preset temperature threshold is greater than or equal to 10% of the temperature threshold, only start the heat dissipation device, or send a signal to the current regulation unit to request reducing the current amplitude of the coil units in this area while starting the heat dissipation device.

[0021] After receiving the signal from the heat dissipation management unit, the current regulation unit runs the current regulation algorithm to generate a new current distribution strategy to maintain the energy efficiency ratio as much as possible while ensuring cooling.

[0022] Further, the mode prediction algorithm is:

[0023] First, preprocess the foreign object distribution information, measured energy efficiency ratio, and channel quality data. Specifically, convert the foreign object distribution information into the grid index of the transmitting coil module, and normalize the measured energy efficiency ratio and channel quality data to a unified range;

[0024] Then, select the working mode according to the preset mode switching conditions in the storage module:

[0025] When the measured energy efficiency ratio ≥ target energy efficiency ratio, SNR ≥ target signal-to-noise ratio, and BER ≤ preset bit error rate threshold, select the transmission mode for the working mode at this time;

[0026] If the foreign object distribution information is not empty, and the energy efficiency ratio decrease value ≥ energy efficiency ratio fluctuation threshold or SNR ≤ target signal-to-noise ratio, select the detection and anti-interference mode for the working mode.

[0027] Furthermore, the single-layer coil is a rectangular single-layer coil, a circular single-layer coil, or other custom-shaped single-layer coils.

[0028] Furthermore, the current regulation unit and the working mode switching unit share a multi-core microprocessor, and the current regulation algorithm and mode switching algorithm are loaded on the multi-core microprocessor.

[0029] The present invention also provides a wireless communication system with foreign object detection and anti-interference functions, which is characterized by including the following steps:

[0030] Step 1: Power on and start. At the initial moment, the wireless communication system is in the transmission mode;

[0031] Step 2: The foreign object detection unit collects the impedance data of each coil unit, processes it to obtain the foreign object distribution information, sends the impedance data and foreign object distribution information to the current regulation unit through the communication coordination unit, and sends the foreign object distribution information to the working mode switching unit through the communication coordination unit;

[0032] Step 3: The current regulation unit uses a current regulation algorithm to generate a current regulation command based on the impedance data, foreign object distribution information, and channel quality data. The current regulation unit controls the multi-switch matrix and the programmable current source in the current regulation unit through the current regulation command to regulate the power-on and power-off, current amplitude, phase difference, and operating frequency of the coil unit, so as to achieve: stopping the current supply of the coil unit affected by foreign objects, and increasing the current amplitude of the coil unit in the adjacent layer corresponding to the row and column positions of the coil unit with the stopped current supply and having a positive staggered layout, and adjusting the current phase difference to 180°; after each regulation, the current regulation unit also needs to obtain the measured energy efficiency ratio. If the measured energy efficiency ratio is less than the target energy efficiency ratio, the current regulation algorithm is used to regenerate the current regulation command; after the measured energy efficiency ratio is greater than or equal to the target energy efficiency ratio, the current regulation unit sends the current measured energy efficiency ratio to the working mode switching unit;

[0033] Step 4: The working mode switching unit predicts the working mode that the wireless communication system should be in at the next moment according to the received current foreign object distribution information, measured energy efficiency ratio, and channel quality data, and generates a corresponding mode control signal to send to the foreign object detection unit and the current regulation unit, so that they adjust the working parameters to adapt to the new working mode, and return to Step 2;

[0034] Step 5: During the execution of Steps 1-4, the heat dissipation management unit monitors the temperature data of each area of the transmitting coil module in real time. When the temperature exceeds the temperature threshold, the temperature is regulated and cooled.

[0035] Advantages of the present invention:

[0036] The present invention combines circuit switching technology, current distribution adjustment, and operating frequency optimization technology to achieve high-precision foreign object detection, efficient information transmission, and dynamic decoupling between multiple layers of coils.

[0037] 1. Function integration and efficiency improvement: Through the collaborative control of the multi-coil unit array, the present invention synchronously realizes high-precision foreign object detection and efficient information anti-interference transmission on a single hardware platform, avoiding the delay problem of traditional time-division multiplexing schemes and improving resource utilization.

[0038] 2. Anti-interference and dynamic adaptability: Based on the positive staggered structure and dynamic frequency optimization technology, the present invention can adaptively adjust the working parameters in a complex electromagnetic environment, reducing the inter-layer interference of planar coils by 60% and improving the transmission stability; at the same time, it supports seamless switching in the scenario where multiple wireless communication receiving devices coexist.

[0039] 3. Cost and System Complexity Reduction: Traditional foreign object detection units usually adopt the architecture of independent sensor arrays and dedicated signal processing chips. The specific working principle is as follows: relying on multiple independent sensors such as millimeter-wave radars, infrared cameras, and thermal sensors to collect data such as distance, temperature, and impedance respectively, and then using a fusion algorithm to judge the presence of foreign objects. Usually, a full-space three-dimensional modeling method is used for result feedback. It is necessary to discretize the area covered by the transmitting coil into a grid, perform forward electromagnetic field calculation by solving Maxwell's equations, and then use an iterative algorithm to inversely deduce the position and dielectric constant of the foreign object. The above traditional method requires the use of multiple sensors and dedicated processing chips, resulting in hardware redundancy, an increase in the circuit board area, and the need for independent power supply and grounding for each module, increasing the wiring complexity; three-dimensional modeling requires calling a high-precision electromagnetic simulation library, with a high computational load, and requires the configuration of a dedicated DSP chip, and the software architecture is complex. The present invention does not require an independent detection coil and directly uses the impedance data of the transmitting coil module (extracting the abnormal frequency band through FFT); moreover, the foreign object detection unit and the current regulation unit can share the same multi-core microcontroller (such as ARM Cortex-M7), and avoid hardware redundancy through task partitioning (core 1 processes the detection algorithm, and core 2 executes the control logic); the foreign object distribution information is directly encoded as an additional check bit in the communication frame (without complex protocol conversion) and is generated synchronously with the phase compensation instruction of the current regulation unit, eliminating the data interaction delay between modules. Compared with the traditional foreign object detection unit, the present invention reduces hardware redundancy through coil unit reuse and intelligent algorithms, reduces the system complexity, and decreases the production cost and maintenance cost.

[0040] 4. Flexible Use and Meeting Different Application Requirements: The wireless communication transmitting device in the wireless communication system of the present invention can be sold separately and replace the wireless communication transmitting device in the existing wireless communication system; the wireless communication transmitting device in the wireless communication system of the present invention can communicate with one wireless communication receiving device for data interaction, or can also communicate with multiple wireless communication receiving devices simultaneously for data interaction. Description of the Drawings

[0041] Figure 1 It is a schematic structural diagram of the presence of a foreign object in the magnetic field of the wireless communication transmitting device and the wireless communication receiving device.

[0042] Figure 2 It is a schematic structural principle diagram of the wireless communication transmitting device in the present invention.

[0043] Figure 3 It is a schematic structural diagram of the coil unit in the wireless communication transmitting device of the present invention.

[0044] Figure 4 It is a schematic structural diagram of the single-layer planar coil layer in the wireless communication transmitting device of the present invention.

[0045] Figure 5It is a front view of the distribution structure of the multi-layer planar coil layer in the wireless communication transmitting device of the present invention.

[0046] Figure 6 It is a schematic diagram (top view) of the relative positional relationship between each coil unit in the first-layer planar coil layer and each coil unit in the second-layer planar coil layer in the transmitting coil module of the present invention.

[0047] Figure 7 It is a schematic diagram of the system operation principle of the wireless communication system of the present invention.

[0048] Reference numerals:

[0049] 1 - Wireless communication receiving device;

[0050] 2 - Metal foreign object;

[0051] 3 - Wireless communication transmitting device; 31 - Transmitting coil module; 311 - Single planar coil layer; 3111 - Coil unit; 3112 - Single-layer coil; 32 - Non-metallic cover plate; 33 - Transmission pad. Detailed implementation manners

[0052] The present invention will be further described below in conjunction with the drawings and embodiments.

[0053] As Figure 1 shown, the present invention provides a wireless communication system, including a wireless communication transmitting device and at least one wireless communication receiving device.

[0054] The improvement of the present invention mainly lies in the wireless communication transmitting device. The wireless communication transmitting device in the present invention includes a non-metallic cover plate, a transmission pad and a transmitting end circuit; the transmitting end circuit includes a high-frequency inverter, a signal generator, a communication compensation circuit and a transmitting coil module; the high-frequency inverter, the signal generator and the communication compensation circuit are all existing units (not shown in the figure); the non-metallic cover plate, the transmitting coil module and the transmission pad are arranged from top to bottom, and the transmitting coil module is connected to the transmitting end circuit through a cable.

[0055] As Figures 2 - 7 shown, the difference between the wireless communication transmitting device in the present invention and the existing wireless communication transmitting device lies in the structure of the transmitting coil module in the present invention, and the wireless communication transmitting device of the present invention further includes a foreign object detection unit, a current regulation unit, a working mode switching unit, a communication coordination unit and a heat dissipation management unit; the data interaction between the foreign object detection unit, the current regulation unit, the working mode switching unit and the heat dissipation management unit is relayed through the communication coordination unit; the communication coordination unit is also responsible for forwarding the channel quality data fed back by the wireless communication receiving device to the current regulation unit and the working mode switching unit.

[0056] The transmitting coil module is disposed on the transmission pad. The non-metallic cover plate is used to protect the transmitting coil module and the transmission pad. The transmission pad is used to optimize the magnetic field distribution and energy coupling efficiency. A magnetic conductive material layer (such as ferrite) is embedded inside the transmission pad to guide and concentrate the electromagnetic field energy and reduce the magnetic leakage loss. At the same time, the transmission pad serves as a bearing base for the transmitting coil module to provide mechanical support for it, ensuring the stable structure of the transmitting coil module and avoiding displacement or deformation. The foreign object detection unit, current regulation unit, working mode switching unit, communication coordination unit, and heat dissipation management unit are disposed under the magnetic conductive material in the transmission pad, and the electronic components are integrally placed at the same position.

[0057] Such as Figure 5 As shown, the transmitting coil module includes s layers of planar coil layers arranged in parallel up and down. Each planar coil layer is a coil array of size m×n composed of m×n coil units evenly distributed. Each coil unit 4 is a coil array of size p×p composed of p×p single-layer coils evenly distributed.

[0058] The determination methods of s, m, n, and p are as follows:

[0059] First, initially determine the initial numerical ranges of s, m, n, and p according to the communication distance, magnetic field coverage, and power requirements. Then, perform simulation analysis on different numerical combinations of s, m, n, and p through electromagnetic simulation software (such as Ansys Maxwell) to evaluate performance indicators such as magnetic field distribution and power transmission efficiency. Finally, considering factors such as cost and installation space limitations, select the optimal numerical combination of s, m, n, and p.

[0060] Of course, it is also possible to test by actually manufacturing samples of transmitting coil modules with different numerical combinations of s, m, n, and p and adjust the parameter values according to the test results.

[0061] In the same coil unit 4, the polarities of two single-layer coils in the same column are opposite, and the polarities of two single-layer coils in the same row are opposite, that is, the polarities of two adjacent single-layer coils are opposite; moreover, all the single-layer coils in the same coil unit 4 are connected in series (the single-layer coils with opposite polarities are also in series). The advantages of such a design are as follows: 1) It helps to eliminate the induced voltage between two adjacent single-layer coils, reduce the mutual interference between two adjacent single-layer coils, and improve the overall stability and transmission efficiency of the wireless communication transmitting device; 2) It can optimize the magnetic field distribution between coils, enhance the power utilization rate of the wireless communication system, improve the energy transmission efficiency of the wireless communication system, and reduce energy loss; 3) The magnetic fields generated by two rectangular single-layer coils in the same column are opposite, and the magnetic fields generated by two rectangular single-layer coils in the same row are also opposite, thus realizing the decoupling between adjacent single-layer coils. For two coils located on the diagonal in the same coil unit 4, they are far apart in space (compared with adjacent row and column coils). According to the electromagnetic field theory, the mutual inductance (M) is inversely proportional to the cube of the distance. Therefore, the actual interference is extremely small and can be ignored. In addition, although the polarities of the two coils located on the diagonal are the same, their magnetic field directions form complementary superposition in the coverage area, and the overall magnetic field distribution remains uniform without generating significant local interference.

[0062] In the present invention, the single-layer coils constituting the coil unit 4 can be rectangular single-layer coils, circular single-layer coils or other custom-shaped single-layer coils. Preferably, considering the manufacturing process difficulty, magnetic field uniformity and decoupling effect, each coil unit in this embodiment is a 2×2 coil array composed of 4 rectangular single-layer coils evenly distributed.

[0063] In the same layer of planar coil layer, the polarities of adjacent single-layer coils that do not belong to the same coil unit are opposite, which can further eliminate the crosstalk between adjacent coil units in the same layer, realize the decoupling between adjacent coil units, and ensure the uniform magnetic field distribution.

[0064] All coil units 4 are connected in parallel.

[0065] When the s-layer planar coil layers are arranged parallel to each other up and down, two coil units at the same position (referring to the same row and column numbers) in two adjacent planar coil layers are arranged in a positive staggered manner and have an overlapping area. Such an arrangement can, on the one hand, ensure uniform coverage of coil units in the wireless transmission area to avoid insufficient electromagnetic field intensity at local points / regions, and on the other hand, can realize the mutual decoupling between adjacent planar coil layers, reduce or even eliminate the interference between adjacent planar coil layers. Figure 5Taking the 4-layer planar coil layer shown as an example, the coil units with the same number of rows and columns in two adjacent planar coil layers are staggered. Each coil unit in the second-layer planar coil layer is respectively located at the orthogonal position of the coil unit at the corresponding row and column position in the first-layer planar coil layer. Each coil unit in the third-layer planar coil layer is respectively located at the orthogonal position of the coil unit at the corresponding row and column position in the second-layer planar coil layer. Each coil unit in the fourth-layer planar coil layer is respectively located at the orthogonal position of the coil unit at the corresponding row and column position in the third-layer planar coil layer. Through the orthogonal and staggered layout design, it can not only avoid the blind spot problem of insufficient electromagnetic field intensity caused by uneven coverage of electromagnetic induction coils in the wireless transmission area, but also reduce the inter-layer magnetic field coupling, realize the mutual decoupling between planar coil layers, and reduce or even eliminate electromagnetic interference.

[0066] The foreign object detection unit is used to collect the impedance of each coil unit in the transmitting coil module and process the collected impedance to locate the foreign object distribution information. Although the foreign object can only be located on the outer surface of the wireless communication transmitting device, due to the complex and staggered coil array, the coil unit most affected by the foreign object is not necessarily located at the uppermost planar coil. Therefore, the foreign object distribution information is not the real position of the foreign object, but is characterized by the layer number and row and column numbers of the coil unit with the largest change in impedance parameters due to the influence of the foreign object. The foreign object detection unit includes a data acquisition module, a data processing module, and a first communication interface module. The data acquisition module collects the impedance data of each coil unit in the transmitting coil module and sends it to the data processing module. The data processing module first extracts the abnormal frequency band (essentially the frequency representation of the eddy current effect) from the received impedance data through FFT (Fast Fourier Transformation), and then fits the abnormal frequency band through the least squares method to obtain the foreign object distribution information (such as at the coil unit in the 3rd row and 4th column of the second-layer planar coil layer). The fitting process is constrained by the physical meaning of the eddy current effect model to ensure that the fitting result conforms to the law of electromagnetic induction. Finally, the foreign object distribution information is encoded into binary data in the format of layer number - row number - column number (for example, when the foreign object distribution information is at the coil unit in the 2nd layer, 3rd row, and 4th column of the transmitting coil module, the foreign object distribution information is encoded into binary data 0010 0011 0100), and is used as an additional check bit of the communication frame and thus embedded into the communication frame, and is transmitted to the current regulation unit, the communication coordination unit, and the working mode switching unit together with the communication frame.

[0067] The current regulation unit is used to control the power on / off, current amplitude, current phase difference, and current operating frequency of each coil unit in each planar coil layer of the transmitting coil module. Through hierarchical current regulation, the electromagnetic field superposition is optimized to avoid electromagnetic field blind spots and interference. The current regulation unit includes a multiplexer matrix, a programmable current source, a current sensor, a voltage sensor, a first microcontroller, and a second communication interface module. The multiplexer matrix is used to control the power on / off of each coil unit in each planar coil layer to achieve dynamic switching of the current path. The programmable current source is used to adjust the amplitude, phase, and operating frequency of the output current of the programmable current source according to the current regulation instruction of the first microcontroller. The current and voltage sensors are used to monitor the current and voltage states of each coil unit in each planar coil layer in real time, so as to provide closed-loop feedback data to the first microcontroller. The first microcontroller is installed with a current regulation algorithm. By running the current regulation algorithm, current regulation instructions are generated and sent to the multiplexer matrix and the programmable current source to achieve current regulation. The second communication interface module is used to realize the interaction between the current regulation unit and the foreign object detection unit, the working mode switching unit, the heat dissipation management unit, and the wireless communication receiving device. It receives the foreign object distribution information from the foreign object detection unit and the channel quality data (including signal-to-noise ratio and bit error rate) from the wireless communication receiving device forwarded by the communication coordination unit, sends the measured energy efficiency ratio to the working mode switching unit, and receives the mode control signal corresponding to the working mode sent by the working mode switching unit, and receives the current amplitude control signal from the heat dissipation management unit.

[0068] The current regulation algorithm installed on the first microcontroller can be a mature existing reinforcement learning decision model, PID control algorithm, or genetic algorithm.

[0069] If the reinforcement learning decision model is adopted, the input of the reinforcement learning decision model is the impedance data of the coil unit, the foreign object distribution information, and the channel quality data. The optimization goal is the energy efficiency ratio. An existing mature algorithm is selected as the optimization strategy for reinforcement learning optimization. Finally, the output of the reinforcement learning decision model is the optimal coil unit current distribution strategy and the working frequency adjustment parameter of the wireless communication system. The optimal current distribution strategy refers to a scheme for dynamically adjusting the current parameters of each coil unit according to the optimization goal, including current amplitude adjustment (for example, reducing the current of the interfered coil unit to 0A and increasing the current of the adjacent layer coil unit for compensation), phase difference control (for example, setting the phase difference between the coil unit orthogonal to the energized coil unit in the adjacent layer to 180° for reverse phase superposition to eliminate mutual inductance interference), and coil unit power on / off instruction (used to activate / turn off the coil unit at a specified position). The working frequency adjustment parameter is also the frequency of the coil excitation current. This frequency affects the reactive power consumption of the coil and jointly determines the total power consumption of the system with the current amplitude. Therefore, the working frequency adjustment parameter needs to be considered when optimizing the energy efficiency ratio.

[0070] If the PID control algorithm is adopted, the input is the error between the actual measurement value and the set value. Specifically in the present invention, it is the error between the actual value and the expected value of the coil impedance, the error between the actual value and the expected value of the signal-to-noise ratio fed back by the wireless communication receiving device, and the error between the actual value of the bit error rate and the acceptable threshold. The output is the control signal adjusted through proportional, integral, and differential adjustments. Specifically in the present invention, it is the coil impedance adjustment signal, the signal-to-noise ratio optimization control signal, and the bit error rate control signal. (According to the error of the coil impedance, the PID control algorithm will adjust the output signal to control the programmable current source to adjust the current amplitude, phase difference, and operating frequency of the coil, so that the coil impedance approaches the expected value; the PID control algorithm will adjust the output signal according to the error of the signal-to-noise ratio to optimize the quality of the wireless communication signal; based on the error of the bit error rate, the PID control algorithm will generate corresponding control instructions to adjust the current source, improve the communication quality, and reduce the bit error rate.)

[0071] If the genetic algorithm is adopted, the algorithm input is the impedance data of the coil unit, the foreign object distribution information, and the channel quality parameters. The algorithm output is consistent with the reinforcement learning decision model, which is the global optimal coil unit current distribution strategy and the operating frequency adjustment parameters of the wireless communication system.

[0072] The specific working principle and process of the current regulation unit are as follows:

[0073] The second communication interface module of the current regulation unit receives the coil impedance data, foreign object distribution information from the foreign object detection unit, and the channel quality data (including signal-to-noise ratio and bit error rate) fed back by the wireless communication receiving device, and sends them to the first microcontroller of the current regulation unit; the first microcontroller runs the current regulation algorithm loaded thereon to process the received data, obtains the optimal current distribution strategy and the working frequency adjustment parameters of the wireless communication system, and generates corresponding control instructions; the first microcontroller sends the control instructions to the multiplexer matrix and the programmable current source, the multiplexer matrix switches the power on and off of each coil unit in each layer of planar coil layers according to the control instructions, and the programmable current source adjusts the current amplitude, current phase difference of each coil unit in each layer of planar coil layers and the working frequency of the wireless communication system (i.e., the resonant frequency of the wireless communication system, and the current frequencies of all coil units must be the same and equal to this resonant frequency); the current and voltage sensors collect the current and voltage of each coil unit in real time, and the temperature sensors collect the temperature data of each coil unit in real time, and send the collected data to the first microcontroller; the first microcontroller calculates the measured energy efficiency ratio by using the existing method according to the received current and voltage of each coil unit, and compares it with the preset target energy efficiency ratio (the target energy efficiency ratio is calculated according to the current, voltage and power required by the wireless communication system). If the measured energy efficiency ratio is lower than the target energy efficiency ratio, the first microcontroller triggers the current regulation algorithm to re-optimize the current distribution strategy of the coil unit and the working frequency adjustment parameters of the wireless communication system to generate new current regulation instructions. If the measured energy efficiency ratio is greater than or equal to the target energy efficiency ratio, it indicates that the current current distribution strategy and working frequency parameters have met the performance requirements and do not need to be re-optimized, and the wireless communication system keeps the existing current distribution strategy and working frequency parameters unchanged.

[0074] Meanwhile, the first microcontroller also needs to respond to the signal sent by the heat dissipation management unit to reduce the current amplitude of the coil unit in a certain area for regional cooling, regenerate a new current distribution strategy through the current regulation algorithm to balance the working states of each coil unit, and try to maintain the energy efficiency ratio while ensuring cooling.

[0075] The working mode switching unit is used to switch the working mode of the wireless communication system to the detection and anti-interference mode or the transmission mode. The working mode switching unit includes a third communication interface module and a second microcontroller; the second microcontroller includes a mode judgment module, a storage module, and a control signal generation module. By default, at the initial moment, the working mode of the wireless communication system is the transmission mode. The mode judgment module analyzes the current foreign object distribution information, measured energy efficiency ratio, and channel quality data from the foreign object detection unit, current regulation unit, and communication coordination unit in real time, and predicts the operating trend of the wireless communication system at the next moment through a mode prediction algorithm, so as to determine the working mode to be activated at the next moment. The storage module is used to store the parameter configurations of each functional unit corresponding to different working modes, including the frequency, amplitude, detection period, and sensor sensitivity threshold of the detection signal of the foreign object detection unit, the current regulation strategy and working frequency regulation parameters of the current regulation unit, the data transmission rate, transmission power, and channel coding rules of the communication coordination unit, and the switching trigger conditions of the working mode switching unit; the control signal generation module is used to generate corresponding mode control signals according to the working mode determined by the mode judgment module and the parameter configurations corresponding to this working mode stored in the storage unit; the third communication interface module is used to realize data interaction between the working mode switching unit and the foreign object detection unit, current regulation unit, and communication coordination unit.

[0076] The method for the mode judgment module to predict the working mode according to the foreign object distribution information, measured energy efficiency ratio, and channel quality data by using a mode prediction algorithm is as follows:

[0077] First, preprocess the foreign object distribution information, measured energy efficiency ratio, and channel quality data. Specifically, convert the foreign object distribution information into the grid index of the transmitting coil module (such as two-dimensional matrix coordinates), and normalize the measured energy efficiency ratio and channel quality data to a unified range (such as 0-1);

[0078] Then, select the working mode according to the preset mode switching conditions in the storage module: when the measured energy efficiency ratio ≥ the target energy efficiency ratio (for example, 85%), SNR ≥ the target signal-to-noise ratio (for example, 20dB), BER ≤ the preset bit error rate threshold (for example, e -5 )), at this time, the working mode is selected as the transmission mode; if the foreign object distribution information is not empty (there is coordinate information), and the energy efficiency ratio decrease value ≥ the energy efficiency ratio fluctuation threshold (for example, 10%) or SNR ≤ the target signal-to-noise ratio (for example, 20dB), the working mode is selected as the detection and anti-interference mode.

[0079] The specific working principle and process of the working mode switching unit:

[0080] The third communication interface module in the working mode switching unit receives the foreign object distribution information from the foreign object detection unit, the measured energy efficiency ratio of the current regulation unit, and the channel quality data of the communication coordination unit, and sends them to the mode judgment module. The mode judgment module compares the data received through the third communication interface module with the preset mode switching conditions in the storage module to determine the currently suitable working mode, and sends the determined working mode to the control signal generation module. The control signal generation module retrieves the parameter configuration corresponding to the working mode from the storage module according to the working mode selected by the mode judgment module and generates a mode control signal. Finally, the mode control signal is sent to the communication coordination unit through the third communication interface module, and is forwarded by the communication coordination unit to the current regulation unit and the foreign object detection unit, so that they adjust their working parameters to adapt to the new working mode, where: the current regulation unit adjusts the current amplitude, current frequency and on-off state of the coil unit. The communication coordination unit adjusts the communication rate, modulation method and transmission power; when the communication rate is reduced, the stability and reliability of communication can be improved to ensure that the detected foreign object distribution information can be accurately transmitted; when a method with stronger anti-interference ability is selected, such as switching from high-order modulation to low-order modulation in the transmission mode, the transmission ability of the signal in a complex environment can be enhanced; when the transmission power is increased, the communication connection with the wireless communication receiving device can be ensured to be stable in the detection and anti-interference modes, and data loss caused by signal attenuation can be avoided. The foreign object detection unit adjusts the detection range and detection frequency. Regularly check the status of the wireless communication system. If data changes result in non-compliance with the current working mode conditions, repeat the above process for mode switching.

[0081] The communication coordination unit is an existing mature unit, including a fourth communication interface module, a channel monitoring module, a protocol stack and a data scheduling module. The channel monitoring module monitors the signal-to-noise ratio and bit error rate of the communication channel in real time, which are the channel quality data; the protocol stack is used to process various communication protocols, including the parsing of received data, the encapsulation of transmitted data, error detection and correction during data transmission, and the management of the connection process (establishment, maintenance and disconnection), to ensure the effective and reliable data transmission between each functional unit (foreign object detection unit, working mode switching unit, current regulation unit and heat dissipation management unit); the data scheduling module is responsible for allocating communication resources according to the priority of the data to be transmitted; the fourth communication interface module is responsible for data interaction with the foreign object detection unit, the working mode switching unit, the current regulation unit and the heat dissipation management unit.

[0082] The specific working principle and process of the communication coordination unit are as follows:

[0083] The channel monitoring module continuously monitors the channel quality data such as the signal-to-noise ratio and bit error rate of the communication channel, sends the monitored channel quality data to the working mode switching unit to provide a basis for mode switching, and forwards the monitored channel quality data to the protocol stack for analysis. The data scheduling module sorts the data to be transmitted according to the preset priority based on the foreign object distribution information sent by the foreign object detection unit and the communication requirements sent by the wireless communication receiving device, and allocates communication resources according to the priority to prevent critical data (such as foreign object distribution information) from being blocked by low-priority data, causing system response delays or even failures.

[0084] The heat dissipation management unit includes a temperature sensor, heat dissipation devices (such as fans, heat sinks), a control circuit, and a fifth communication interface module. There are multiple temperature sensors, which divide each layer of the planar coil layer into multiple regions, and a temperature sensor is set in each region to respectively collect the temperature data of each region in real time and send the temperature data to the control circuit. The control circuit compares the collected temperature data with a preset temperature threshold. If the temperature of a certain region exceeds the preset temperature threshold and the temperature difference is within 10% of the temperature threshold, it indicates that the temperature of this region does not seriously threaten the safety of the wireless communication system at this time. The control circuit sends a signal to the current regulation unit through the fifth communication interface module to request reducing the current amplitude of the coil unit in this region to reduce heat generation. If the temperature of a certain region exceeds the preset temperature threshold and the temperature difference is greater than or equal to 10% of the temperature threshold, then while the control circuit sends a signal to the current regulation unit to request reducing the current amplitude of the coil unit in this region, the control circuit starts the heat dissipation device (such as the fan rotating faster, the heat sink starting refrigeration, etc.) for heat dissipation, or only starts the heat dissipation device for heat dissipation. During this period, the temperature sensor continuously monitors the temperature change of this region. When the temperature drops to the safe range, the control circuit adjusts the operating state of the heat dissipation device, such as reducing the fan speed. This hierarchical cooling strategy of the heat dissipation management unit is an optimal solution, which can not only play a role in cooling to maintain system safety, but also avoid the additional energy consumption and noise caused by frequent startup of the heat dissipation device. Of course, in other embodiments, if energy consumption and noise are not considered, when the heat dissipation management unit detects that the temperature exceeds the limit, it can also directly start the heat dissipation device to cool down.

[0085] The above first microcontroller and second microcontroller can be two independent microcontrollers, or the same multi-core microcontroller, that is, the current regulation unit and the working mode switching unit share a multi-core microcontroller, and the current regulation algorithm and the mode prediction algorithm are loaded on this multi-core microcontroller. At this time, hardware redundancy can be avoided.

[0086] The working principle of the wireless communication system of the present invention:

[0087] The present invention realizes information transmission, foreign object detection, and anti-interference functions through the collaborative work of multiple layers of planar coil layers.

[0088] When the multi-layer planar coil layer is working, the current regulation unit dynamically adjusts the current distribution and operating frequency of each coil unit according to a preset current regulation algorithm to achieve the best information transmission effect and foreign object detection and anti-interference performance. The foreign object detection unit uses the impedance data of the coil unit as an observation index of the electromagnetic field state and synchronously analyzes the magnetic field distortion characteristics during the information transmission process; the impedance data of the coil unit includes the impedance amplitude (Z), the impedance phase angle (θ), and the frequency response characteristics (the abnormal frequency band extracted from the impedance data through FFT); the magnetic field distortion characteristics are a three-dimensional distortion thermal map generated by eddy current inversion.

[0089] During data transmission, the foreign object detection unit analyzes the frequency domain characteristics of the coil impedance in real time through fast Fourier transform (FFT). This process does not require switching the working mode, and the foreign object location information is encoded as an additional check bit of the communication frame by the first communication interface module in the foreign object detection unit and transmitted to the wireless communication receiving device synchronously with the data stream, forming a foreign object perception-communication closed loop.

[0090] When the current regulation unit receives the channel quality data fed back by the wireless communication receiving device, the current regulation unit dynamically adjusts the operating frequency, current amplitude, and current phase of each coil unit, so that the communication frequency band automatically avoids the impedance mutation area caused by foreign objects in the magnetic field. At the same time, through the reverse magnetic field superposition of the polarity complementary coil group, the mutual inductance interference of adjacent coils is naturally suppressed during the process of optimizing the transmission energy, realizing the synchronous improvement of the transmission efficiency and anti-interference ability. The channel quality data includes the signal-to-noise ratio and the bit error rate; further preferably, the channel quality data can also include the signal strength, propagation delay, and the position information of the wireless communication receiving device; the signal strength is not directly related to the magnetic field distortion, but can be used to assist in judging the transmission distance and environmental attenuation; the propagation delay is used for real-time sensitive scenarios; the position information of the wireless communication receiving device is used to provide the position information of the wireless receiving end for the communication coordination unit to optimize the allocation of channel resources in a multi-device wireless communication scenario (one wireless communication transmitting device communicates with multiple wireless communication receiving devices).

[0091] The communication coordination unit adopts broadband spectrum compressed sensing technology to design both the traditional time-division multiplexed foreign object detection frequency band and the communication frequency band (the communication frequency band refers to the frequency range used for data transmission between the wireless communication transmitting device and the receiving device) as continuously adjustable spectrums. For example, the preset continuously adjustable operating frequency band is from 6.78 MHz to 13.56 MHz, and according to the channel quality data real-time monitored by the channel monitoring module, the data scheduling module adjusts the operating frequency band from 6.78 MHz to 7.2 MHz.

[0092] When the working mode switching unit switches the system to the anti-interference mode, it sends a corresponding mode control signal to the current regulation unit through the communication coordination unit, enabling the current regulation unit to automatically trigger an interlayer current redistribution instruction: through the phase compensation of the positive interleaved coil group, the coil units in the interfered area are seamlessly migrated to the adjacent layer coil units, and the electromagnetic field energy distribution is reconstructed to bypass the foreign object area. This process enables a causal linkage between foreign object isolation and channel optimization, achieving an integrated and rapid response for detection and regulation. For example: when the foreign object detection unit analyzes the impedance data of each coil unit through FFT and finds that the impedance amplitude of a certain area in the second layer (such as the 4th column in the 3rd row) suddenly increases by 20% and the phase lags by 15%, it is determined as interference from a metal foreign object; or when the current regulation unit detects that the signal-to-noise ratio (SNR) fed back by the wireless communication receiving device drops to 18 dB and the bit error rate (BER) rises to 2e -5 , the current regulation unit generates a current regulation instruction. The multiplexer matrix disconnects the interfered coil unit in the second layer (such as the coil unit in the 4th column in the 3rd row) according to this current regulation instruction, stops its current supply, and the programmable current source adjusts the parameters of its adjacent layer (such as the parameters of the planar coil layer in the third layer), including the current amplitude, phase difference, and operating frequency; after adjustment, the coil unit in the adjacent layer that corresponds to the row and column positions of the coil unit in the second layer where the current supply is stopped and is in a positive interleaved layout (such as the coil unit in the 4th column in the 3rd row in the third layer) replaces the original coil unit in the second layer where the current supply is stopped, and through reverse phase superposition, ensures uniform distribution of the magnetic field energy.

Claims

1. A wireless communication system with foreign object detection and anti-interference functions, comprising a wireless communication transmitting device and a wireless communication receiving device; characterized in that, The wireless communication transmitting device includes: A transmitting coil module, which includes s layers of planar coil layers arranged in parallel up and down. Each layer of planar coil layer is an m×n coil array composed of multiple coil units evenly distributed. Each coil unit is a p×p coil array composed of multiple single-layer coils evenly distributed. s, m, n are determined through electromagnetic simulation software or sample testing according to the communication distance, magnetic field coverage range, and power requirements. All single-layer coils in the same coil unit are connected in series, and the polarities of adjacent single-layer coils are opposite. In the same layer of planar coil layer, the polarities of adjacent single-layer coils that do not belong to the same coil unit are opposite. In two adjacent planar coil layers, two coil units with the same number of rows and columns are arranged in a positive staggered manner and have an overlapping area. All coil units are connected in parallel; A foreign object detection unit, which is used to collect the impedance data of the coil unit and process it to obtain foreign object distribution information. The foreign object distribution information is the layer number and row and column numbers of the coil unit where the impedance parameter change caused by the foreign object is the largest; A current regulation unit, according to the impedance data, foreign object distribution information output by the foreign object detection unit, and channel quality data from the wireless communication receiving device, uses a current regulation algorithm to generate a current regulation instruction. The current regulation instruction is used to control the multi-way switch matrix and programmable current source in the current regulation unit to perform on-off control, current amplitude size, phase difference, and operating frequency regulation of the coil unit, so as to achieve: stopping the current supply of the coil unit affected by foreign objects, and increasing the current amplitude of the coil unit in the adjacent layer that corresponds to the row and column positions of the coil unit with the stopped current supply and is arranged in a positive staggered layout, and adjusting the current phase difference to 180°. After each regulation, the current regulation unit also needs to obtain the measured energy efficiency ratio. If the measured energy efficiency ratio is less than the target energy efficiency ratio, the current regulation algorithm is used to regenerate the current regulation instruction; A working mode switching unit, which predicts and switches the working mode of the wireless communication system at the next moment according to the current foreign object distribution information, the measured energy efficiency ratio, the channel quality data, and the mode prediction algorithm. The working mode includes a detection and anti-interference mode and a transmission mode; A communication coordination unit, which is used to realize data interaction between the wireless communication transmitting device and the wireless communication receiving device, and is responsible for relaying data between the foreign object detection unit, the current regulation unit, the working mode switching unit, and the heat dissipation management unit to realize data interaction; A heat dissipation management unit, which is used to collect the temperature data of each area in the transmitting coil module in real time. When the collected temperature exceeds the preset temperature threshold, a heat dissipation device is started for cooling.

2. The wireless communication system with foreign object detection and anti-interference functions according to claim 1, characterized in that: The current regulation algorithm is a reinforcement learning decision model. The input is the impedance data of the coil unit, the foreign object distribution information, and the channel quality data. The optimization goal is the energy efficiency ratio. The output is the optimal coil unit current distribution strategy and the working frequency adjustment parameter. The coil unit current distribution strategy refers to a scheme for dynamically adjusting the current parameters of each coil unit according to the optimization goal, including current amplitude adjustment, phase difference control, and on-off instructions for the coil unit.

3. The wireless communication system with foreign object detection and anti-interference functions according to claim 1, characterized in that: The current regulation algorithm is a PID control algorithm. The inputs are the error between the actual value and the expected value of the coil impedance, the error between the actual value and the expected value of the signal-to-noise ratio (SNR) fed back by the wireless communication receiving device, and the error between the actual value of the bit error rate and the acceptable threshold. The output is a control signal adjusted by proportional, integral, and differential operations, including a coil impedance adjustment signal, an SNR optimization control signal, and a bit error rate control signal.

4. The wireless communication system with foreign object detection and anti-interference functions according to claim 1, characterized in that: The current regulation algorithm is a genetic algorithm. The inputs are the impedance data of the coil units, the foreign object distribution information, and the channel quality parameters. The outputs are the global optimal coil unit current distribution strategy and the working frequency adjustment parameters of the wireless communication system.

5. The wireless communication system with foreign object detection and anti-interference functions according to any one of claims 1-4, characterized in that: The foreign object detection unit includes a data acquisition module, a data processing module, and a first communication interface module. The data acquisition module acquires the impedance data of each coil unit and sends it to the data processing module. The data processing module first extracts the abnormal frequency band from the impedance data through FFT, and then fits the abnormal frequency band by the least squares method to obtain the foreign object distribution information. The first communication interface module encodes the foreign object distribution information into binary data in the format of layer number - row number - column number and embeds it in the communication frame for transmission.

6. The wireless communication system with foreign object detection and anti-interference functions according to claim 5, characterized in that: The heat dissipation management unit adopts a hierarchical cooling strategy: When the temperature difference between a detected area and the preset temperature threshold is less than 10% of the temperature threshold, the heat dissipation management unit sends a signal to the current regulation unit to request reducing the current amplitude of the coil units in this area. When the temperature difference between a detected area and the preset temperature threshold is greater than or equal to 10% of the temperature threshold, only start the heat dissipation device, or send a signal to the current regulation unit to request reducing the current amplitude of the coil units in this area while starting the heat dissipation device. After receiving the signal from the heat dissipation management unit, the current regulation unit runs the current regulation algorithm to generate a new current distribution strategy to maintain the energy efficiency ratio as much as possible while ensuring cooling.

7. The wireless communication system with foreign object detection and anti-interference functions according to claim 6, characterized in that: The mode prediction algorithm is as follows: First, preprocess the foreign object distribution information, the measured energy efficiency ratio, and the channel quality data. Specifically, convert the foreign object distribution information into the grid index of the transmitting coil module, and normalize the measured energy efficiency ratio and the channel quality data to a unified range. Then, select the working mode according to the preset mode switching conditions in the storage module: When the measured energy efficiency ratio ≥ the target energy efficiency ratio, SNR ≥ the target signal-to-noise ratio, and BER ≤ the preset bit error rate threshold, the working mode is selected as the transmission mode at this time. If the foreign object distribution information is not empty, and the energy efficiency ratio decrease value ≥ the energy efficiency ratio fluctuation threshold or SNR ≤ the target signal-to-noise ratio, the working mode is selected as the detection and anti-interference mode.

8. The wireless communication system with foreign object detection and anti-interference functions according to claim 7, characterized in that: The single-layer coil is a rectangular single-layer coil, a circular single-layer coil, or other self-defined shaped single-layer coils.

9. The wireless communication system with foreign object detection and anti-interference functions according to claim 8, characterized in that: The current regulation unit and the working mode switching unit share a multi-core microprocessor, and the current regulation algorithm and the mode switching algorithm are loaded on this multi-core microprocessor.

10. A wireless communication system with foreign object detection and anti-interference functions, characterized in that, It includes the following steps: Step 1: Power on and start. At the initial moment, the wireless communication system is in the transmission mode. Step 2: The foreign object detection unit collects the impedance data of each coil unit, processes it to obtain the foreign object distribution information, and sends the impedance data and the foreign object distribution information to the current regulation unit through the communication coordination unit, and sends the foreign object distribution information to the working mode switching unit through the communication coordination unit; Step 3: The current regulation unit uses the current regulation algorithm to generate a current regulation command according to the impedance data, the foreign object distribution information, and the channel quality data, and controls the multi-switch matrix and the programmable current source in the current regulation unit through the current regulation command to perform on / off control, current amplitude size, phase difference, and working frequency regulation of the coil unit, so as to achieve: stopping the current supply of the coil unit affected by foreign objects, and increasing the current amplitude of the coil unit corresponding to the row and column positions of the coil unit with the stopped current supply and arranged in a positive staggered layout in the adjacent layer and adjusting the current phase difference to 180°; after each regulation, the current regulation unit also needs to obtain the measured energy efficiency ratio. If the measured energy efficiency ratio is less than the target energy efficiency ratio, the current regulation algorithm is used to regenerate the current regulation command; After the measured energy efficiency ratio is greater than or equal to the target energy efficiency ratio, the current regulation unit sends the current measured energy efficiency ratio to the working mode switching unit; Step 4: The working mode switching unit predicts the working mode that the wireless communication system should be in at the next moment according to the received current foreign object distribution information, measured energy efficiency ratio, and channel quality data, and generates a corresponding mode control signal to send to the foreign object detection unit and the current regulation unit, so that they adjust the working parameters to adapt to the new working mode, and return to Step 2; Step 5: During the execution of Steps 1-4, the heat dissipation management unit monitors the temperature data of each area of the transmitting coil module in real time, and regulates and cools the temperature when the temperature exceeds the temperature threshold.

Images