Frequency hopping communication method in wireless power transmission system

Abstract

The invention discloses a frequency hopping communication method in a wireless power transmission system, which realizes data transmission between a transmitting end and a receiving end of the wireless power transmission system and finally realizes constant-voltage or constant-current output of the receiving end. Both the transmitting terminal and the receiving terminal are provided with power failure memories, firstly, a radio frequency communication module of the receiving terminal broadcasts through a default address, when the transmitting terminal which does not work receives default address data, equipment matching is carried out, and after matching is normal, the transmitting terminal takes a stored equipment number as a new equipment address and sends the new equipment address to the receiving terminal; the receiving end and the transmitting end perform data communication according to the new equipment address, and then confirm the charging position; after the position is confirmed, the transmitting end and the receiving end carry out data communication according to a designed frequency hopping algorithm, and normal charging is carried out; by means of the method, real-time hopping of communication frequency points is achieved, the requirement that multiple sets of equipment work at the same place at the same time is met, and radio frequency interference on peripheral wireless communication equipment is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless power transmission, and particularly to a frequency hopping communication method in a wireless power transmission system. Background Art

[0002] Wireless power transmission technology is a new technology different from traditional power transmission methods. Due to its many unique advantages such as safety, convenience, and reliability, it has developed rapidly with the convenience of its application and has been gradually applied to fields such as consumer electronics, medical electronics, and electric vehicles.

[0003] In practical applications, a wireless power transmission system hopes that any transmitter and any receiver can be matched for power transmission. However, traditional radio frequency communication systems use a static allocation mode, that is, the communication address and communication frequency point are both preset in advance. Therefore, when the communication parameters of the transmitter do not match those of the receiver, wireless power transmission cannot be achieved. Additionally, within the same spatial range, if multiple wireless power transmission devices work simultaneously and their communication channels and addresses are the same, there will be interference between data, causing the devices to malfunction.

[0004] Therefore, the prior art with the publication number CN107124047A and the name of "Wireless Power Transmission System and Its Radio Frequency Communication Method" provides a wireless power transmission system and its radio frequency communication method to avoid interference. The invention can automatically allocate communication channels for the transmitter and the receiver, which is convenient, fast, safe, and reliable. The specific technical means are as follows: The wireless power transmission system includes a transmitter and a receiver. Among them, the transmitter includes a transmitting coil for transmitting wireless power, a transmitter MCU for controlling signal processing and control at the transmitter, and a radio frequency receiving module for receiving the status information of the receiver. The receiver includes a receiving coil for receiving wireless power, a receiver MCU for controlling signal processing and control at the receiver, and a radio frequency transmitting module for transmitting the status information of the receiver. A signal demodulation circuit for demodulating the modulation signal of the transmitter is connected between the receiving coil and the receiver MCU. The radio frequency communication method of the wireless power transmission system includes the following steps: Activate the transmitter: The transmitter is in a sleep state when not working. When the receiver is within the working range of the transmitter, the transmitter is activated; Frequency scanning: The transmitter scans communication channels and determines the unoccupied communication channels and the corresponding frequencies of these communication channels; The transmitter MCU encodes the communication channel frequencies and transmits the encoded signal to the receiver; The signal demodulation circuit of the receiver demodulates the signal modulated by the transmitter and transmits the demodulated signal to the receiver MCU. The receiver MCU controls the initialization of the radio frequency transmitting module and sets the communication frequency of the radio frequency transmitter according to the demodulated signal; A radio frequency communication connection is established between the transmitter and the receiver; The wireless power transmission system starts to work.

[0005] Through the above-mentioned prior art, by setting up a two-way communication circuit, communication channels can be automatically allocated to the transmitting end and the receiving end, which is convenient, fast, safe and reliable. Although it can solve the problem that multiple wireless power transmission devices work simultaneously without data interference, its scalability is not high and it is limited by the number of available communication channels.

[0006] For this reason, the present application proposes a frequency hopping communication method in a wireless power transmission system, which not only enables any transmitting end and any receiving end in the same application scenario to be matched for wireless power transmission without wireless communication interference problems, but also does not require an additional signal demodulation circuit for demodulating the modulation signal of the transmitting end, and has high scalability and is not limited by the number of communication channels. Summary of the Invention

[0007] The present invention provides a frequency hopping communication method in a wireless power transmission system, and the technical problem to be solved is: how to achieve that any transmitting end and any receiving end in the same application scenario can be matched for wireless power transmission, and there is no communication interference problem during the process of wireless power transmission.

[0008] The present invention solves the above technical problems through the following technical solutions. The wireless power transmission system includes a transmitting end and a receiving end. Electric energy is transmitted between the transmitting end and the receiving end through a transmitting coil and a receiving coil. The receiving end includes a radio frequency communication module for transmitting the status information of the receiving end. Both the transmitting end and the receiving end have a non-volatile memory for storing charging parameters. The charging parameters include the device number and the random code required by the frequency hopping algorithm. The radio frequency communication module of the receiving end broadcasts through the default address. When the non-working transmitting end receives the default address data, device matching is performed. After the matching is normal, the transmitting end sends the stored device number as the new device address to the receiving end. Both the receiving end and the transmitting end perform data communication according to the new device address. After data communication is achieved, the charging position is confirmed. After the position is confirmed, the transmitting end and the receiving end perform data communication through the frequency hopping algorithm and perform normal charging.

[0009] Further, when the transmitting end and the receiving end perform the frequency hopping algorithm, the frequency point values calculated by the transmitting end and the receiving end each time are the same. After the receiving end sends the data, it changes the frequency point of the radio frequency module, and the next frame of new data is sent according to the new frequency point; after the transmitting end receives the data, it changes the frequency point of the radio frequency module and receives the next frame of new data according to the new frequency point; the transmitting end and the receiving end realize the real-time frequency hopping of the radio frequency module frequency point.

[0010] Further, the non-volatile memory of the transmitting end stores the unique device number, the maximum charging voltage, and the maximum charging current; the non-volatile memory of the receiving end stores the device model of the receiving end, the charging voltage, the charging current, the stop current, and the calibration coefficient. The data in the non-volatile memory are all set by the upper computer through the radio frequency communication module.

[0011] Furthermore, the confirmation of the charging position is achieved through the coupling degree detection method, specifically: the transmitting end control circuit outputs pulsed magnetic field energy through the transmitting coil. When the receiving end coupling degree detection circuit senses a voltage value exceeding the set value, the coupling degree is passed, indicating that the receiving end is within the normal charging range; if the coupling degree detection fails for a continuous period of time, it means that the receiving end is not within the normal charging range, and the receiving end control circuit outputs a fault signal, and the transmitting end enters the standby state.

[0012] Furthermore, both the transmitting end and the receiving end are set to the same default communication device address and default communication frequency point. The specific device matching and communication process includes the following steps: S1: After the transmitting end is powered on, it reads the charging parameters in the non-volatile memory and saves them, and enters the standby state to receive data; after the receiving end is powered on, it reads the charging parameters in the non-volatile memory and saves them, and enters the sleep state waiting for the charging enable signal. S2: After the receiving end control circuit receives the charging enable signal, it sends out the charging parameter information read from the non-volatile memory of the receiving end and the random code required for the frequency hopping algorithm through the receiving end radio frequency module. The transmitting end control circuit confirms the matching receiving end according to the charging parameters and saves the received charging parameters and random code. S3: The communication addresses of the radio frequency modules at both the transmitting end and the receiving end are updated to the new device communication address, and communication is carried out through the new device communication address. S4: The receiving end control circuit sends the sampled data to the paired transmitting end, calculates the communication frequency point of the next frame of data through the random code and updates the communication frequency point of the receiving end radio frequency module; after receiving the data, the transmitting end control circuit calculates the communication frequency point of the next frame of data according to the saved random code by the same frequency hopping algorithm as the receiving end and updates the communication frequency point of the transmitting end radio frequency module, and enters the coupling degree detection state.

[0013] Furthermore, it also includes steps S5 and S6; S5: The transmitting end control circuit outputs pulsed magnetic field energy through the transmitting coil. The receiving end control circuit converts the received magnetic energy into electrical energy through the receiving coil and conducts the coupling degree detection of the transmitting coil and the receiving coil through the coupling degree detection circuit; when the coil coupling degree signal received by the receiving end control circuit is greater than the set value of the coupling degree signal, the receiving end control circuit sends the coupling degree detection pass code to the transmitting end control circuit through the frequency hopping communication method, indicating that the receiving end is in the normal charging area and can be charged normally; S6: The receiving - end control circuit transmits the output voltage and current data of the receiving end in real - time through the frequency - hopping communication method; after the transmitting - end control circuit enters the normal charging process, it performs double - closed - loop control according to the output voltage, current data received in real - time through the frequency - hopping communication method and the stored charging parameter information to achieve constant - voltage or constant - current output.

[0014] Further, in the step S2, the random code is generated by the random number function rand, and the seed of the rand function is provided by the lower eight bits of the output voltage sampling value.

[0015] Further, in the step S4, both the transmitting - end control circuit of the transmitting end and the receiving - end control circuit of the receiving end have an array storing the same 256 16 - bit binary data. The 16 - bit binary data is obtained from the primitive polynomial. The receiving - end control circuit selects the corresponding array data through the random code generated by itself; the transmitting - end control circuit selects the corresponding data through the received random code; the transmitting - end and receiving - end control circuits generate a 16 - bit m - sequence pseudo - random code according to the selected data, and then take the lower 6 bits of the pseudo - random code as the communication frequency point.

[0016] Still further, in the step S5, the specific process is as follows: S51: After the devices are matched, the transmitting - end control circuit outputs pulsed magnetic - field energy through the transmitting coil to confirm whether the receiving - end coil is within the charging range. S52: The receiving - end control circuit collects the voltage signal output by the coupling - degree detection circuit and compares it with the coupling - degree signal set value. When the sampling value is less than the set value, re - sampling and comparison are performed; when the coupling - degree sampling value is continuously lower than the set value for 10 seconds, it is confirmed that the receiving - end coil is not within the charging range, and a fault signal is output; when it is detected that the coupling - degree sampling value is greater than the set value within 10 seconds, step S53 is entered. S53: The receiving - end control circuit sends a coupling - degree detection - passed code to the transmitting - end control circuit through the status code bit of the wireless communication to trigger the charging process.

[0017] Further, the unique device number stored in the transmitting - end power - off memory is set by the host computer, and the content includes: the device production year, the device production week number, the device model, and the device production code.

[0018] The present invention has the following advantages compared with the prior art: In the frequency-hopping communication method of the wireless power transmission system, data is stored in the non-volatile memory, which is equivalent to pre-storing the communication address at the transmitting end and pre-storing the charging parameters at the receiving end. When the receiving-end device approaches the transmitting end for power transmission, the receiving end first sends the device charging parameters with the default communication address. After the transmitting end confirms, it sends the pre-stored communication address to the receiving end and configures it to the RF module of the transmitting end to achieve the unique matching of the communication addresses of the transmitting end and the receiving end. Then, through the coupling degree detection to confirm the wireless power transmission range, determine whether it is in the effective charging area, and the frequency-hopping communication algorithm, the transmitting end and the receiving end update the communication frequency points in real time. Even if the communication frequency points of multiple devices overlap, they are filtered by the device addresses. The device communication addresses generated by the unique device coding of the transmitting end at the beginning stage are unique for each device after normal operation, so that there is no mutual interference between multiple devices, solving the problem that the signals of adjacent channels are prone to crosstalk. The present invention has the advantages of simple control method, high reliability, and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the block diagram of the wireless power transmission system used in the embodiment of the present invention; Figure 2 is the schematic diagram of the RF communication process at the transmitting end in the embodiment of the present invention; Figure 3 is the schematic diagram of the RF communication process at the receiving end in the embodiment of the present invention; Figure 4 is the schematic diagram of the frequency-hopping algorithm at the transmitting end in the embodiment of the present invention; Figure 5 is the schematic diagram of the frequency-hopping algorithm at the receiving end in the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The embodiments of the present invention will be described in detail below. These embodiments are implemented on the premise of the technical solution of the present invention, and detailed implementation manners and specific operation processes are given. However, the protection scope of the present invention is not limited to the following embodiments.

[0021] This embodiment provides a technical solution: a wireless communication control method in a wireless power transmission system. The wireless power transmission system used in this method includes a transmitting end and a receiving end, both of which have non-volatile memories, as Figure 1 shown; the transmitting end and the receiving end realize power transmission through their respective transmitting coils and receiving coils, and the data transmission between the transmitting end control circuit and the receiving end control circuit is realized through their respective RF modules.

[0022] The unique device number, maximum charging voltage, and maximum charging current are stored in the power-off memory of the transmitting end; the device model, charging voltage, charging current, stop current, and calibration coefficient of the receiving end are stored in the power-off memory of the receiving end. The data in the power-off memory are all set by the host computer using a radio frequency communication module. Among them, the maximum charging voltage and charging current set by the transmitting end are restrictive. If the charging voltage or charging current set by the receiving end is greater than the maximum charging voltage and charging current set by the transmitting end, the device will not work. The receiving end sets information such as charging voltage and charging current wirelessly and stores them in the power-off memory. When the receiving end arrives at the charging position, it sends the charging voltage, charging current, and stop current to the transmitting end. The transmitting end performs closed-loop control based on the charging voltage and charging current values to achieve constant current or constant voltage output at the receiving end. When the current in the constant voltage stage is less than the stop current, the device stops working. The calibration parameter is used to calibrate the error due to the error in the sampling circuit.

[0023] The confirmation of the charging position is achieved through the coupling degree detection method. Specifically: the control circuit of the transmitting end outputs pulsed magnetic field energy through the transmitting coil. The control circuit of the receiving end includes a coupling degree detection circuit. When the coupling degree detection circuit of the receiving end senses a voltage value exceeding the set value, the set voltage value is specifically determined according to the charging distance and the hardware circuit parameters of the device. Then the coupling degree passes, and a coupling degree detection pass code is generated, indicating that the receiving end is within the normal charging range; when the coupling degree detection fails to pass within 15 consecutive seconds, it means that the receiving end is not within the normal charging range. The control circuit of the receiving end outputs a fault signal, and the transmitting end enters the standby state, that is, it stops outputting pulsed magnetic field energy. For example, when applied to a service robot, the transmitting end is a charging base fixed at a certain position, and the receiving end is built into the service robot. When not within the normal charging range, the control circuit of the receiving end outputs a fault signal to the service robot, and the robot takes subsequent actions according to the fault signal, such as fine-tuning the position or re-navigating.

[0024] Both the transmitting end and the receiving end are set to the same default communication device address and default communication frequency point. When the electrical device deems it necessary to charge, it sends an enabling signal to the control circuit of the receiving end. After receiving the enabling signal, the radio frequency communication module of the receiving end first broadcasts through the set default address. When the unoperated transmitting end receives the default address data, it performs device matching. After the matching is normal, the transmitting end sends the stored device number as the new device address to the receiving end. The new device address is used as the communication address to ensure unique matching when the frequency points are the same during the frequency hopping communication process. The receiving end and the transmitting end perform data communication according to the new device address, and then confirm the charging position; after the position is confirmed, the receiving end and the transmitting end perform data communication according to the designed frequency hopping algorithm and conduct normal charging, such as Figure 2 、 Figure 3As shown below. The specific steps are as follows: Step 1: After the transmitter is powered on, it reads and saves information such as the device number in the non-volatile memory and enters the standby state to receive data; after the receiver is powered on, it reads and saves the charging parameters in the non-volatile memory and enters the sleep state waiting for the charging enable signal. Step 2: After the control circuit of the receiver receives the charging enable signal, it sends out the charging parameter information read from the non-volatile memory of the receiver and the random code required for the frequency hopping algorithm through the RF module of the receiver. After sending, it switches to the receiving state; after the control circuit of the transmitter receives the charging parameter information through the RF module of the transmitter, it compares it with the allowed device models and working parameter data of this transmitter to confirm whether it is a receiver matching this transmitter. If so, it enters the next step and saves the received charging parameters and random code; otherwise, it ignores it.

[0025] Step 3: After the transmitter matches the normal charging data, it sends the device number of the transmitter to the control circuit of the receiver as the new device communication address, and changes the communication address of the RF module of the transmitter to the new device communication address and enters the data receiving state; after the control circuit of the receiver receives the device number, it changes the communication address of the RF module of the receiver to the new device communication address and enters the data sending state. Step 4: The control circuit of the receiver sends the data sampled by the receiver to the paired transmitter. The data includes voltage and current information, and then calculates the communication frequency point of the next frame of data through the random code and updates the communication frequency point of the RF module of the receiver; after the control circuit of the transmitter receives the data, it also calculates the communication frequency point of the next frame of data according to the same frequency hopping algorithm of the receiver through the saved random code and updates the communication frequency point of the RF module of the transmitter, and enters the coupling degree detection state. Step 5: The control circuit of the transmitter outputs pulsed magnetic field energy through the transmitting coil, and the control circuit of the receiver converts the received magnetic energy into electrical energy through the receiving coil and conducts the coupling degree detection of the transmitting coil and the receiving coil through the coupling degree detection circuit; when the coil coupling degree signal received by the control circuit of the receiver is greater than the set value of the coupling degree signal, the control circuit of the receiver uses the frequency hopping communication method, that is, the carrier frequency of the transmitted and received signals changes discretely according to a predetermined rule. The control circuit of the receiver sends the coupling degree detection pass code to the control circuit of the transmitter, indicating that the receiver is in the normal charging area and can charge normally. Step 6: The control circuit of the receiver sends the output voltage and current data of the receiver in real time through the frequency hopping communication method; after the control circuit of the transmitter enters the normal charging process, it performs double closed-loop control according to the output voltage and current data received in real time through the frequency hopping communication method and the saved charging parameter information, that is, the voltage outer loop and current inner loop in the prior art, to achieve constant voltage or constant current output.

[0026] In this embodiment, in the first step, the device number stored in the power-off memory of the transmitter is unique and set by the host computer. The content includes: the production year of the device, the production week number of the device, the device model, and the production code of the device.

[0027] In this embodiment, in the second step, the random code for frequency-hopping communication is generated by the random number function rand, and the seed of the rand function is provided by the lower eight bits of the voltage sampling value.

[0028] In this embodiment, in the fourth step, there is an array with the same 256 16-bit binary data in both the transmitter control circuit and the receiver control circuit. The 16-bit binary data is obtained from the primitive polynomial. The receiver control circuit selects the corresponding array data through the random code generated by itself; the transmitter control circuit selects the corresponding data through the received random code; the transmitter and receiver control circuits then generate a 16-bit m-sequence pseudo-random code based on the selected data, and then take the lower 6 bits of the pseudo-random code as the communication frequency point. The 16-bit m-sequence pseudo-random codes may overlap, but if they do, there is also the device address for filtering. The device communication address is generated by the unique device code of the transmitter at the beginning stage. After each set of devices works normally, its communication address is unique. Therefore, there is no mutual interference between multiple devices. The flowchart of the frequency-hopping algorithm is as Figure 4 、 Figure 5 shown. The specific steps are as follows: 1. In this example, the variable names defined by the transmitter and the receiver are the same. The receiver selects the primitive polynomial data DXS_Data[DXS_Value] according to the random code DXS_Value generated by itself, and sets the initial value of the variable nRF_Freq_Value to 0; the transmitter selects the primitive polynomial data DXS_Data[DXS_Value] according to the random code DXS_Value sent by the receiver, and sets the initial value of the variable nRF_Freq_Value to 0; 2. Perform an AND operation on nRF_Freq_Value and DXS_Data[DXS_Value], and assign the result to the variable nRF_Freq_Value_pro; 3. Perform an odd parity check on nRF_Freq_Value_pro and judge the result. When the result is 0, nRF_Freq_Value is shifted left, and the lowest bit is filled with 1; when the result is 1, nRF_Freq_Value is shifted left, and the lowest bit is filled with 0; after processing, take the lower 6 bits of nRF_Freq_Value as the frequency offset value nRF_Freq_Data.

[0029] 4. After the transmitting end receives a new frame of data, it updates the new frequency point of the RF module at the transmitting end, and its value is nRF_Freq_Data + 50; after the receiving end sends a new frame of data, it updates the new frequency point of the RF module at the receiving end, and its value is nRF_Freq_Data + 50.

[0030] As can be seen from the above steps, the frequency point values calculated by the transmitting end and the receiving end are the same each time. In this example, the NRF24L01 RF module is used, so the frequency point change range is between 2.45 GHz and 2.513 GHz. After the receiving end sends the data, it changes the frequency point of the RF module, and the next new frame of data is sent according to the new frequency point; after the transmitting end receives the data, it changes the frequency point of the RF module and receives the next new frame of data according to the new frequency point; the transmitting end and the receiving end realize the real-time hopping of the frequency point of the RF module.

[0031] In this embodiment, in the fifth step, the specific process is as follows: 1. After the devices are matched, the control circuit at the transmitting end outputs pulsed magnetic field energy through the transmitting coil to confirm whether the receiving coil is within the charging range; 2. The control circuit at the receiving end collects the voltage signal output by the coupling degree detection circuit and compares it with the set value of the coupling degree signal. When the sampled value is less than the set value, resampling and comparison are performed; when the coupling degree sampled value is continuously lower than the set value for 10 seconds, it is confirmed that the receiving coil is not within the charging range, and a fault signal is output; when it is detected that the coupling degree sampled value is greater than the set value within 10 seconds, step 3 is entered; 3. The control circuit at the receiving end sends a coupling degree detection passed code to the control circuit at the transmitting end through the status code bit of wireless communication, indicating that the receiving end is in the normal charging area and can enter the normal charging process.

[0032] In summary, the frequency hopping communication method in the wireless power transmission system of the above embodiment adopts a simple control method, uses the wireless communication control method to realize device identification and charging position confirmation; through this method, real-time hopping of the communication frequency point is achieved, mutual interference between multiple devices in the same place is reduced, and the expandability is high, without other hardware settings.

[0033] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A frequency hopping communication method in a wireless power transmission system. The wireless power transmission system includes a transmitting end and a receiving end. Electric energy is transmitted between the transmitting end and the receiving end through a transmitting coil and a receiving coil. The receiving end includes a radio frequency communication module for transmitting the status information of the receiving end, and is characterized in that Both the transmitting end and the receiving end have a power-down memory for storing charging parameters. The charging parameters include the device number and the random code required for the frequency-hopping algorithm. The RF communication module of the receiving end broadcasts through the default address. When the non-operating transmitting end receives the default address data, device matching is performed. After successful matching, the transmitting end sends the stored device number as the new device address to the receiving end. Both the receiving end and the transmitting end perform data communication according to the new device address. After data communication is achieved, the charging position is confirmed. After position confirmation, the transmitting end and the receiving end perform data communication through the frequency-hopping algorithm and conduct normal charging.

2. The frequency hopping communication method in a wireless power transmission system according to claim 1, wherein: When the transmitting end and the receiving end perform the frequency-hopping algorithm, the frequency point values calculated by the transmitting end and the receiving end are the same each time. After the receiving end sends the data, it changes the frequency point of the RF module, and the next frame of new data is sent according to the new frequency point. After the transmitting end receives the data, it changes the frequency point of the RF module and receives the next frame of new data according to the new frequency point. The transmitting end and the receiving end achieve real-time frequency hopping of the RF module frequency points.

3. A frequency hopping communication method in a wireless power transmission system according to claim 1, characterized in that: The transmitting end's power-down memory stores the unique device number, the maximum charging voltage, and the maximum charging current. The receiving end's power-down memory stores the device model of the receiving end, the charging voltage, the charging current, the stop current, and the calibration coefficient. The data in the power-down memory are all set by the host computer using the RF communication module.

4. A frequency hopping communication method in a wireless power transmission system according to claim 1, characterized in that: The confirmation of the charging position is achieved through the coupling degree detection method. Specifically: The transmitting end control circuit outputs pulsed magnetic field energy through the transmitting coil. When the receiving end coupling degree detection circuit senses a voltage value exceeding the set value, the coupling degree is passed, indicating that the receiving end is within the normal charging range. If the coupling degree detection cannot pass for a continuous period of time, it means that the receiving end is not within the normal charging range. The receiving end control circuit outputs a fault signal, and the transmitting end enters the standby state.

5. A frequency hopping communication method in a wireless power transmission system according to claim 1, characterized in that: Both the transmitting end and the receiving end are set to the unified default communication device address and the default communication frequency point. The specific device matching and communication process include the following steps: S1: After the transmitting end is powered on, it reads the charging parameters in the power-down memory and saves them, and enters the standby state to receive data. After the receiving end is powered on, it reads the charging parameters in the power-down memory and saves them, and enters the sleep state waiting for the charging enable signal. S2: After the receiving end control circuit receives the charging enable signal, it sends the charging parameter information read from the power-down memory of the receiving end and the random code required for the frequency-hopping algorithm through the receiving end RF module. The transmitting end control circuit confirms the matching receiving end according to the charging parameters and saves the received charging parameters and random code. S3: The communication addresses of the RF modules of both the transmitting end and the receiving end are updated to the new device communication address, and communication is performed through the new device communication address. S4: The receiving end control circuit sends the sampled data to the paired transmitting end, calculates the communication frequency point of the next frame of data through the random code and updates the communication frequency point of the receiving end RF module. After receiving the data, the transmitting end control circuit calculates the communication frequency point of the next frame of data according to the saved random code using the same frequency-hopping algorithm as the receiving end and updates the communication frequency point of the transmitting end RF module, and enters the coupling degree detection state.

6. A frequency hopping communication method in a wireless power transmission system according to claim 5, characterized in that: It also includes steps S5 and S6; S5: The transmitting - end control circuit outputs pulsed magnetic - field energy through the transmitting coil. The receiving - end control circuit converts the received magnetic energy into electrical energy through the receiving coil and detects the coupling degree between the transmitting coil and the receiving coil through the coupling - degree detection circuit. When the coil - coupling - degree signal received by the receiving - end control circuit is greater than the set value of the coupling - degree signal, the receiving - end control circuit sends a coupling - degree detection - passed code to the transmitting - end control circuit through the frequency - hopping communication method, indicating that the receiving end is in the normal charging area and can be charged normally; S6: The receiving - end control circuit sends the output voltage and current data of the receiving end in real - time through the frequency - hopping communication method; After the transmitting - end control circuit enters the normal charging process, it performs double - closed - loop control according to the output voltage, current data received in real - time through the frequency - hopping communication method and the stored charging - parameter information to achieve constant - voltage or constant - current output.

7. A frequency hopping communication method in a wireless power transmission system according to claim 5, characterized in that: In the step S2, the random code is generated by the random - number function rand, and the seed of the rand function is provided by the lower eight bits of the output - voltage sampling value.

8. A frequency hopping communication method in a wireless power transmission system according to claim 5, characterized in that: In the step S4, both the transmitting - end control circuit of the transmitting end and the receiving - end control circuit of the receiving end have an array storing the same 256 16 - bit binary data. The 16 - bit binary data is obtained from the primitive polynomial. The receiving - end control circuit selects the corresponding array data through the random code generated by itself; the transmitting - end control circuit selects the corresponding data through the received random code; The transmitting - end and receiving - end control circuits generate a 16 - bit m - sequence pseudo - random code according to the selected data, and then take the lower 6 bits of the pseudo - random code as the communication frequency point.

9. A frequency hopping communication method in a wireless power transmission system according to claim 6, characterized in that: In the step S5, the specific process is as follows: S51: After the devices are matched, the transmitting - end control circuit outputs pulsed magnetic - field energy through the transmitting coil to confirm whether the receiving - end coil is within the charging range; S52: The receiving - end control circuit collects the voltage signal output by the coupling - degree detection circuit and compares it with the set value of the coupling - degree signal. When the sampling value is less than the set value, re - sampling and comparison are performed; when the coupling - degree sampling value is continuously lower than the set value for 10 seconds, it is confirmed that the receiving - end coil is not within the charging range, and a fault signal is output; when the coupling - degree sampling value is detected to be greater than the set value within 10 seconds, step S53 is entered; S53: The receiving - end control circuit sends a coupling - degree detection - passed code to the transmitting - end control circuit through the status - code bit of wireless communication to trigger the charging process.

10. A frequency hopping communication method in a wireless power transmission system according to claim 3, characterized in that: The unique device number stored in the transmitting - end power - off memory is set by the host computer, and the content includes: the device production year, the device production week number, the device model, and the device production code.

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