Multiband wireless energy and information cooperative transmission system and method

Abstract

The invention discloses a multiband wireless energy and information cooperative transmission system and method, and the system comprises a plurality of coils which are respectively a transmitting coil, a plurality of repeating coils and a receiving coil which are sequentially arranged at equal intervals. Each coil comprises a multi-resonance frequency band circuit, the multi-resonance frequency band circuit comprises a compensation inductor, one end of the compensation inductor is an end point I, the other end of the compensation inductor is connected in series with a compensation capacitor to form a compensation unit, the other end of the compensation capacitor is an end point II, and a resonance inductor and a resonance capacitor are connected in series to form a resonance unit. The resonance unit is connected in parallel with the compensation capacitor; in the transmitting coil, two ends of a high-frequency constant voltage source are respectively connected with an end point I and an end point II of the multi-resonance frequency band circuit; in the relay coil, an end point I and an end point II of the multi-resonant frequency band circuit are connected; in the receiving coil, a load is respectively connected with an end point I and an end point II of the multi-resonance frequency band circuit. According to the invention, cooperative transmission of energy and information is realized.

Description

Technical Field

[0001] This invention relates to the field of wireless power transmission, and in particular to a multi-band wireless power and information collaborative transmission system suitable for online monitoring equipment of high-voltage transmission lines. Background Technology

[0002] With the continuous advancement of the Internet of Things (IoT) and smart grids, the requirements for real-time performance and reliability in the sensing and remote monitoring of high-voltage transmission lines are increasing. To achieve online acquisition of key state parameters such as voltage, current, temperature, and mechanical stress, various monitoring devices are widely deployed on towers, insulators, and conductors. However, these front-end devices face two major challenges in long-term stable operation:

[0003] (1) Energy supply: Existing energy supply methods have defects. Solar and wind energy are limited by meteorological conditions, and their continuity and reliability are insufficient. Although current transformers based on conductor current are stable, they are difficult to cross the insulator skirts to form a cross-insulation power supply path. Moreover, they are limited by the insulation safety distance and cannot directly supply power to distributed terminal equipment.

[0004] (2) Communication: Traditional short-range communication technologies such as RFID and Bluetooth have poor stability under strong electric field interference, making it difficult to support the long-term online operation of the system.

[0005] Wireless power transfer, with its contactless power supply and excellent electrical insulation properties, shows promise in high-voltage transmission line scenarios. In particular, the domino-type magnetically coupled resonant structure, which constructs multi-stage magnetic coupling paths through relay coils, exhibits high energy transfer efficiency and embedded deployment capabilities. However, current mainstream wireless power transfer systems are mostly focused power transmission systems, which are insufficient to meet engineering communication requirements.

[0006] While existing research on wireless energy-data collaborative transmission has made progress, it still has shortcomings in terms of information channel scalability, structural integration, and multi-frequency modulation flexibility. When considering the embedding of information transmission channels into the internal structure of high-voltage transmission line insulators, breakthroughs are urgently needed to address issues such as constructing multiple frequency-domain isolated information transmission channels, solving the limitation of single-channel information capacity, and improving bandwidth utilization. Summary of the Invention

[0007] The technical problem to be solved by this invention is: the power supply of online monitoring equipment for high-voltage transmission lines is unsustainable, and communication is susceptible to interference and has poor stability. How to achieve efficient and stable coordinated transmission of energy and information?

[0008] To solve the above-mentioned technical problems, the present invention provides a multi-band wireless power and information coordinated transmission system, including multiple coils, namely a transmitting coil, multiple relay coils and a receiving coil arranged at equal intervals in sequence;

[0009] Each coil includes a multi-resonant frequency band circuit, which includes a compensation inductor L. m Compensating inductor L m One end is terminal one, and the other end is connected to the compensation capacitor C. m The series connection forms a compensation unit, and the compensation capacitor C m The other end is terminal two, resonant inductor L p With resonant capacitor C p The series connection forms a resonant unit, and the resonant unit and the compensation capacitor C m Parallel connection;

[0010] In the transmitting coil, the two ends of the high-frequency constant voltage source are connected to the first and second terminals of the multi-resonant frequency band circuit, respectively.

[0011] In the relay coil, the first and second terminals of the multi-resonant band circuit are connected in phase;

[0012] In the receiving coil, the load is connected to terminal one and terminal two of the multi-resonant band circuit, respectively.

[0013] In the aforementioned multi-band wireless power and information co-transmission system, in adjacent coils, the compensating inductor of one coil and the resonant inductor of another coil are of the same type and form a coupling pair. From both ends toward the middle, the coil types of adjacent coupling pairs are different and are arranged alternately.

[0014] The aforementioned multi-band wireless power and information co-transmission system includes DD coils and Q coils.

[0015] In the aforementioned multi-band wireless power and information collaborative transmission system, there are 3 relay coils, forming 4 coupling pairs. The coil types of the 4 coupling pairs are Q coil, DD coil, DD coil, and Q coil, respectively.

[0016] In the aforementioned multi-band wireless power and information collaborative transmission system, the physical connection between each coil is an insulator string, and the coils are all embedded in the insulator string, which is a whole.

[0017] In the aforementioned multi-band wireless power and information collaborative transmission system, there are two types and arrangement schemes for the resonant inductor and the compensation inductor in the same relay coil: one is to use DD coil and Q coil respectively, and the other is to use two DD coils that are rotated 90 degrees relative to each other.

[0018] The aforementioned multi-band wireless power and information collaborative transmission system consists of multiple resonant frequency points formed by multiple resonant frequency band circuits, which serve as one power transmission channel and one or more data transmission channels respectively; and adopts a frequency shift keying modulation method based on multi-frequency point switching to realize serial data transmission between multiple data information transmission channels.

[0019] A method for optimizing variable parameters in a multi-band wireless power and information coordinated transmission system includes:

[0020] Step 1: Construct an equivalent topology model of a multi-band wireless power and information co-transmission system that can simultaneously characterize power transmission channels and data transmission channels, including:

[0021] It includes multiple coils, namely a transmitting coil, multiple relay coils and a receiving coil arranged at equal intervals in sequence;

[0022] Each coil includes a multi-resonant frequency band circuit, which is an LCC compensated topology, including a compensating inductor L. m Compensating inductor L m One end is terminal one, and the other end is connected to the compensation capacitor C. m The series connection forms a compensation unit, and the compensation capacitor C m The other end is terminal two, resonant inductor L p With resonant capacitor C p The series connection forms a resonant unit, and the resonant unit and the compensation capacitor C m Parallel connection;

[0023] In the transmitting coil, the two ends of the high-frequency constant voltage source are connected to the first and second terminals of the multi-resonant frequency band circuit, respectively.

[0024] In the relay coil, the first and second terminals of the multi-resonant band circuit are connected in phase;

[0025] In the receiving coil, the load is connected to terminal one and terminal two of the multi-resonant band circuit, respectively;

[0026] Set the parameters for each compensation inductor, compensation capacitor, resonant inductor, resonant capacitor, coil mutual inductance, and load impedance resistance;

[0027] Step 2: Adjust the system coupling coefficient and inductance offset factor p, including:

[0028] The system coupling coefficient φ is adjusted by changing the spacing, number of turns, or winding method of adjacent coils;

[0029] The inductance offset factor p takes the value that satisfies: L m =p×L p C m =p×C p L m To compensate for inductance, L p For resonant inductance, C m To compensate capacitor, C p It is a resonant capacitor;

[0030] Step 3: Adjust the self-inductance of the resonant inductor and the equivalent load resistance R in the transmitting coil. eq And make the self-inductance of the resonant inductance and the compensating inductance in all coils the same;

[0031] Step 4: Based on frequency domain characteristic analysis, select the frequency point with the highest output power and transmission efficiency from multiple resonant peak clusters as the operating frequency of the power transmission channel; calculate the output power and transmission efficiency at this frequency point. If the output power meets the transmission setting specifications, proceed to the next step; otherwise, return to Step 2 and readjust the inductor offset factor p and coupling coefficient. Alternatively, return to step three to adjust the resonant inductor L. p and equivalent load resistance R eq Continue until the performance indicators meet the requirements;

[0032] Step 5: Select one or more frequency points from the remaining resonant peak clusters as the operating frequency of the data transmission channel;

[0033] Check the difference between the operating frequency of the selected data transmission channel and the operating frequency of the power channel, as well as the operating frequency of each data channel. If the frequency difference is greater than or equal to the set value, the demodulation margin requirement is met. If the frequency difference is less than the set value, reselect the frequency point or return to step two to adjust the system coupling coefficient φ and inductance offset factor p to change the resonant peak distribution.

[0034] Step Six: Calculate the voltage gain of the data transmission channel selected in Step Five, ensuring that the voltage gain of each data channel at the operating frequency is greater than or equal to the set value, so that the receiver can accurately demodulate the signal. If the voltage gain meets the requirements, the parameter optimization process ends; otherwise, return to Step Five to reselect the data channel frequency, or iteratively adjust the inductor offset factor p and coupling coefficient. Resonant inductor L p Resistance R eq Continue until the gain of all data channels meets the requirements.

[0035] In the aforementioned method for optimizing variable parameters in a multi-band wireless power and information collaborative transmission system, in adjacent coils, the compensating inductor of one coil and the resonant inductor of another coil have the same coil type and form a coupling pair. From both ends toward the middle, the coil types of adjacent coupling pairs are different and are arranged alternately.

[0036] In the aforementioned method for optimizing variable parameters in a multi-band wireless power and information collaborative transmission system, there are two types and arrangement schemes for the resonant inductor and the compensation inductor in the same relay coil: one is to use DD coil and Q coil respectively, and the other is to use two DD coils that are rotated 90 degrees relative to each other.

[0037] The beneficial effects achieved by this invention are as follows: The system of this invention adopts a multi-resonant frequency band design, forming independent power and data transmission channels, realizing the coordinated transmission of energy and information, and solving the power supply and communication problems of online monitoring equipment for high-voltage transmission lines. It avoids mutual interference between energy and information transmission, improving the stability and efficiency of transmission.

[0038] The relay coil has a reasonable structural design and can be embedded inside a 35kV-level composite insulator. The electric field distribution meets the insulation requirements and is suitable for high-voltage environments. The FSK modulation strategy based on multi-frequency switching improves the information transmission rate and achieves higher transmission efficiency under the same symbol rate. The system parameters can be optimized and adjusted to achieve a balance between efficiency and power according to actual load characteristics and other factors, which has good practicality and flexibility. Attached Figure Description

[0039] Figure 1 This is a flowchart of parameter optimization for a multi-band wireless power and information collaborative transmission system based on multiple relay coils, as described in Embodiment 1 of the present invention.

[0040] Figure 2 This is a schematic diagram of the multi-relay coupling mechanism in Embodiment 1 of the present invention;

[0041] Figure 3 This is a schematic diagram of the multi-resonant band circuit structure in Embodiment 1 of the present invention;

[0042] Figure 4 This is an equivalent circuit diagram of the multi-band wireless power and information collaborative transmission system based on multiple relay coils in Embodiment 1 of the present invention;

[0043] Figure 5 This is a schematic diagram of the insulator string and coil arrangement scheme in Embodiment 1 of the present invention;

[0044] Figure 6 shows the typical parameters shown in Table 1 in the application of Embodiment 1 of the present invention, and the curve relationship between output voltage gain, transmission power, transmission efficiency, operating frequency and load resistance is calculated.

[0045] Figure 7 is a graph showing the system output power and efficiency curves under different parameter configurations in Embodiment 1 of the present invention.

[0046] Figure 8 shows the system output voltage gain curves under different parameter configurations in Embodiment 1 of the present invention. Detailed Implementation

[0047] To illustrate the technical solutions disclosed in this invention in detail, further explanation will be provided below with reference to the accompanying drawings and specific embodiments.

[0048] Example 1

[0049] This embodiment provides a multi-band wireless power and information collaborative transmission system, including multiple coils, namely a transmitting coil, multiple relay coils and a receiving coil arranged at equal intervals in sequence;

[0050] Each coil includes a multi-resonant frequency band circuit, which is an LCC compensated topology, including a compensating inductor L. m Compensating inductor L m One end is terminal one, and the other end is connected to the compensation capacitor C. m The series connection forms a compensation unit, and the compensation capacitor C m The other end is terminal two, resonant inductor L p With resonant capacitor C p The series connection forms a resonant unit, and the resonant unit and the compensation capacitor C m Parallel connection;

[0051] In the transmitting coil, the two ends of the high-frequency constant voltage source are connected to the first and second terminals of the multi-resonant frequency band circuit, respectively.

[0052] In the relay coil, the first and second terminals of the multi-resonant band circuit are connected in phase;

[0053] In the receiving coil, the load is connected to terminal one and terminal two of the multi-resonant band circuit, respectively.

[0054] In adjacent coils, the compensating inductor of one coil and the resonant inductor of another coil are of the same coil type and form a coupling pair. From both ends towards the middle, the coil types of adjacent coupling pairs are different and alternate. The coil types include DD coils (bipolar coils) and Q coils (rectangular coils). In this embodiment, it includes a transmitting coil, three relay coils, and a receiving coil, comprising four coupling pairs with coil types of Q coil, DD coil, DD coil, and Q coil, respectively. This coil arrangement can eliminate cross-coupling between non-adjacent relay coils, improve adaptability to insulator embedding, and can be embedded inside 35kV-level composite insulators.

[0055] like Figure 5 As shown, the physical connection between the coils is an insulator string, and the coils are all embedded in the insulator string, which is a single unit. The distance between adjacent coils is 95mm.

[0056] A frequency shift keying (FSK) modulation method based on multi-frequency switching is adopted to realize serial data transmission between three data information transmission channels, achieving a higher information transmission rate at the same symbol rate.

[0057] Compensating inductor L m With compensation capacitor C m The resonant circuit is configured to set the operating frequency, and the resonant inductance L pand resonant capacitor C p Impedance matching and system tuning are achieved. Multiple resonant frequency points are formed through this multi-resonant band circuit. In this embodiment, a total of 4 resonant frequency points are formed, which serve as 1 power transmission channel and 3 data transmission channels, respectively. The power transmission channel is CH2 in Figure 6(a); the 3 data transmission channels are CH1, CH3, and CH4 in Figure 6(a), realizing energy-information decoupling and coordinated transmission in the frequency domain.

[0058] With inductance offset factor p and coupling coefficient The self-inductance L of the resonant inductor coil p Equivalent load resistance R eq These are variable parameters. By adjusting these parameters, a balance is achieved between efficiency and power, ensuring optimal performance of both the power transmission channel and the data transmission channel.

[0059] Example 2

[0060] This embodiment provides a method for optimizing variable parameters in a multi-band wireless power and information collaborative transmission system, the flowchart of which is shown below. Figure 1 As shown, the steps include:

[0061] Step 1: Establish the equivalent topology model of the system. Construct an equivalent topology model that can simultaneously represent the power transmission channel and the data transmission channel of the multi-band wireless power and information collaborative transmission system;

[0062] It includes multiple coils, namely a transmitting coil, multiple relay coils and a receiving coil arranged at equal intervals in sequence;

[0063] Each coil includes a multi-resonant frequency band circuit, which is an LCC compensated topology, including a compensating inductor L. m Compensating inductor L m One end is terminal one, and the other end is connected to the compensation capacitor C. m The series connection forms a compensation unit, and the compensation capacitor C m The other end is terminal two, resonant inductor L p With resonant capacitor C p The series connection forms a resonant unit, and the resonant unit and the compensation capacitor C m Parallel connection;

[0064] In the transmitting coil, the two ends of the high-frequency constant voltage source are connected to the first and second terminals of the multi-resonant frequency band circuit, respectively.

[0065] In the relay coil, the first and second terminals of the multi-resonant band circuit are connected in phase;

[0066] In the receiving coil, the load is connected to terminal one and terminal two of the multi-resonant band circuit, respectively.

[0067] In adjacent coils, the compensating inductance of one coil and the resonant inductance of another coil are of the same coil type and form a coupling pair. From both ends toward the middle, the coil types of adjacent coupling pairs are different. The coil types include DD coils (bipolar coils) and Q coils (rectangular coils).

[0068] In the same relay coil, the resonant inductor and compensating inductor can be of DD coil and Q coil, or Q coil and DD coil, respectively. Alternatively, both the resonant inductor and compensating inductor can be DD coils, with the two DD coils crossed at a 90-degree angle. For example... Figure 2 The relay coil 2 in the middle consists of two DD type coils, one gray-green and one pink. The pink one is equivalent to the gray-green DD coil rotated 90 degrees clockwise.

[0069] The parameters of each compensation inductor, compensation capacitor, resonant inductor, resonant capacitor, coil mutual inductance, and load impedance resistance are set to accurately reflect the electrical connection relationship and energy-information interaction path between each component.

[0070] Step 2: Determine the initial design space. Based on the equivalent topology model established in Step 1, adjust the system coupling coefficient φ and the inductance offset factor p.

[0071] The system coupling coefficient φ is adjusted by changing the spacing, number of turns, or winding method of adjacent coils to ensure that the energy coupling between coils is within a reasonable range; all adjacent coils are arranged at equal intervals.

[0072] The inductance offset factor p takes the value that satisfies: L m =p×L p C m =p×C p The relationship, in which L m To compensate for inductance, L p For resonant inductance, C m To compensate capacitor, C p This is the resonant capacitor. The inductance offset factor p ratio of the compensation unit and the resonant unit is initially set to obtain an initial design space encompassing multiple resonant frequency bands.

[0073] Step 3: Optimize system impedance characteristics. Based on the initial design space determined in Step 2, adjust the self-inductance of the resonant inductor in the transmitting coil and the equivalent load resistance R. eq The self-inductance of the transmitting coil is adjusted by changing the number of coil turns or the wire diameter to match the system's resonant frequency requirements. The equivalent load resistance is adjusted by selecting a suitable load resistance according to the power requirements of the monitoring equipment to ensure optimal system impedance matching, reduce reflection losses, and improve energy transmission efficiency. The self-inductance of the resonant inductance and compensating inductance in all coils remains consistent.

[0074] Step 4: Design the power transmission channel. Based on frequency domain characteristic analysis, select the frequency point with the highest output power and transmission efficiency from multiple resonant peak clusters as the operating frequency of the power transmission channel; calculate the output power and transmission efficiency at this frequency point. If the output power meets the transmission setting specifications, proceed to the next step; if not, return to Step 2 and readjust the inductor offset factor p and coupling coefficient. Alternatively, return to step three to adjust the resonant inductor L. p and equivalent load resistance R eq Continue until the performance indicators meet the requirements.

[0075] Step 5: Design the data transmission channels. Based on the successful design of the power transmission channels, select three frequency points from the remaining resonant peak clusters as the operating frequencies of the data transmission channels. As shown in Figure 6, there are a total of four gain peak clusters. One of these clusters was already selected as the power channel in Step 4, leaving three peak clusters for three data transmission channels. Alternatively, two of the remaining three peak clusters can be selected as two data transmission channels as needed. The number of data transmission channels can be determined as needed, provided that it is ≤3.

[0076] Check the difference between the operating frequency of the selected data transmission channel and the operating frequency of the power channel, as well as the operating frequency of each data channel. If the frequency difference is greater than or equal to the set value, such as 10kHz, the demodulation margin requirement is met, and signal aliasing is avoided. If the frequency difference is less than the set value, reselect the frequency point or return to step two to adjust the system coupling coefficient φ and inductance offset factor p to change the resonant peak distribution.

[0077] Step Six: Verify Data Channel Gain. Calculate the voltage gain of the three data transmission channels selected in Step Five, ensuring that the voltage gain of each data channel at the operating frequency is greater than or equal to the set value, such as 1.0, to ensure accurate signal demodulation at the receiver. If the voltage gain meets the requirement, the parameter optimization process ends; otherwise, return to Step Five to reselect the data channel frequency, or iteratively adjust the inductor offset factor p and coupling coefficient. Resonant inductor L p Resistance R eq Parameters are adjusted until the gain of all data channels meets the requirements.

[0078] like Figure 2As shown, taking a 5-coil system as an example, to adapt to the large shed structure of 35kV composite insulators, the multi-resonant frequency band circuit provided in this embodiment has the following technical effects: Strong spatial decoupling: In the same relay coil, there are two coil types and arrangement schemes for the resonant inductor and the compensating inductor. Scheme 1 uses DD coil and Q coil respectively, and Scheme 2 uses two DD coils, which are rotated 90 degrees relative to each other. In Scheme 1, when the DD coil and Q coil are arranged coaxially, the magnetic flux closed path formed makes their mutual inductance zero, thereby eliminating the mutual inductance of the compensating inductor L in the same relay coil. m and resonant inductance L p This reduces the coupling effects between coils and avoids cross-coupling between non-adjacent coils, which helps to simplify system complexity.

[0079] Good structural symmetry: In Scheme 2, the two DD coils are arranged at a 90-degree angle to each other, and there is no obvious mutual inductance interference between any two DD coils that are arranged at a 90-degree angle.

[0080] Unified parameters: The structural parameters of multi-stage resonators can be set consistently, thereby simplifying system modeling and resonant point tuning.

[0081] The multi-resonant bandpass circuit in this embodiment is designed based on an LCC compensated topology, and the equivalent circuit is as follows: Figure 3 As shown. Compensating inductor L m With compensation capacitor C m This constitutes a compensation unit used to set the system's operating frequency; resonant inductor L p and resonant capacitor C p It is used to achieve impedance matching and system tuning.

[0082] If there are more than 3 relay coils, more than 4 resonance peak clusters as described in step 4 will appear. Power channels and data channels are selected from all resonance peak clusters. However, only one power channel is selected; the remaining resonance peak clusters are selected based on the required number of data channels.

[0083] To analyze the coupling effect of the multi-band wireless power and information coordinated transmission system of the present invention, a reflection impedance Z is introduced. sp The equivalent resistance Z of the subsequent stage coil circuit s The mutual inductance is equivalent to the equivalent circuit of the preceding stage coil. For example, in... Figure 4 In the receiving coil circuit, Z s After mutual induction M 3R This is equivalent to the resistance in the third relay coil; similarly, the equivalent resistance in the third relay coil circuit can also be passed through M. 23 This is equivalent to the second relay coil circuit.

[0084] Represented as Z sp =(ωM) 2 / Z s Where ω = 2πf, f is the operating frequency, M is the mutual inductance between coils; M is the mutual inductance between adjacent coils, and ω is the operating angular frequency.

[0085] Satisfy the relationship shown in equation (1):

[0086] (11)

[0087] Where p is the inductance offset factor, 0 <p<1。

[0088] A normalized design parameter ω0 = 2πf0 is introduced, where f0 is the initial setting value of the operating frequency, and a modulation parameter ω = mω0 is introduced, where m > 0, and m is the modulation parameter. This represents the input impedance. According to... Figure 3 The circuit shown can be used to obtain

[0089] (12)

[0090] in,

[0091] (13)

[0092] Therefore, we can obtain the solution. Figure 3 The three resonant points of the equivalent circuit shown are respectively

[0093] (14)

[0094] in,

[0095] (15)

[0096] From the above analysis, it can be seen that, Figure 3 The compensation structure shown supports three different resonant frequency points, which can form a multi-resonant frequency band platform, providing a basis for frequency decoupling between the power channel and the data channel.

[0097] The equivalent circuit model of the multi-relay multi-band wireless power and information cooperative transmission system proposed in this invention is as follows: Figure 4 As shown. U in It is an equivalent high-frequency constant voltage source, R eq This is the equivalent load resistance of the rectifier. Subscripts 1, 2, and 3 indicate the number of repeater coils, and subscripts T and R indicate the transmitting and receiving coils, respectively. Each coil consists of an LCC compensation network. mi and R mi (i=1,2,3,T,R) represents the compensating inductance of the i-th relay coil and its series internal resistance, C mi This is the corresponding compensation capacitor; L pi and r piLet C represent the resonant inductance of the i-th relay coil and its series internal resistance. pi This is the corresponding resonant capacitor. M ij (i,j=1,2,3,T,R) represents the mutual inductance between coil i and coil j. Furthermore, i Ai i Bi (i=1,2,3,T,R) represent the current flowing through the compensating inductor and the resonant inductor of coil i, respectively.

[0098] To ensure the existence of multiple resonant frequencies in the system, the resonant frequency of each resonant element must remain consistent. Therefore, the transmitting coil, receiving coil, and relay coil must have identical circuit parameters. Consequently, the self-inductance, resistance, compensation capacitance, and mutual inductance of adjacent coils are all set to the same values, resulting in the following relationship:

[0099] (16)

[0100] definition The input current vector for each resonant cavity. For each resonant cavity, the output current vector is i = T, R, 1, 2, 3. If the input voltage vector is a multi-relay wireless power transfer (WPT) system based on Kirchhoff's voltage law (KVL), then it can be represented as:

[0101] (17)

[0102] Among them, Z Cmi =-1 / jωC mi If i = T, R, 1, 2, 3, then the output voltage at the load terminal is...

[0103] (18)

[0104] The system transmission efficiency is calculated based on the ratio between the load output power and the system input power, and is expressed as follows:

[0105] (19)

[0106] To provide a more intuitive analysis of the system, this embodiment uses the typical parameters shown in Table 1 to calculate the relationship between the system output voltage gain, transmission power, transmission efficiency, operating frequency, and load resistance, as shown in Figure 6.

[0107] Table 1 System Parameter List

[0108]

[0109] As shown in Figure 6(a), there are four voltage gain peak clusters, denoted as CH1, CH2, CH3, and CH4. As shown in Figures 6(b) and (c), during the system design process, the frequency point with the highest power and efficiency (i.e., CH2) is selected as the power transmission channel to ensure efficient energy supply to the system. The remaining CH1, CH3, and CH4 are selected as data transmission channels to ensure system stability during modulation and demodulation.

[0110] Based on the above analysis, and using the parameters shown in Table 2, the system variable parameters, namely the inductance offset factor p and the coupling coefficient, are further analyzed. , self-inductance of the resonant coil L p Equivalent load R eq Let C be a variable, and analyze the impact of each parameter on system performance. Among them, the compensation capacitor C... m and resonant capacitor C p Calculate according to formula (1).

[0111] Table 2 Main parameters in the calculation

[0112]

[0113] (1) Power channel parameters: Figure 7 shows different p, k, L p and R eq The system's output power and transmission efficiency curves are shown under certain conditions. The results indicate that the system's transmission efficiency increases with p, k, and L. p It increases with the increase of R. eq The system output power decreases as p, k, and L increase. p It decreases as R increases. eq The value increases with the load characteristics. This indicates that in practical design, an appropriate load should be selected based on the load characteristics. and adjust appropriately. and A balance is achieved between efficiency and power.

[0114] (2) Data transmission channel parameters: Figure 8 shows the output voltage gain characteristics of the data transmission channel under different parameters. The results show that the gain is highly sensitive to frequency, and a smaller k can provide a denser multi-frequency point structure; increasing p will shift the gain extremum point to a higher frequency, which is suitable for adjusting the data modulation frequency point. p and R eq When the voltage is increased, the voltage gain is slightly improved, which is more conducive to data demodulation in the information channel.

[0115] The parameter analysis above shows that the power channel and information channel are separable in the resonant frequency domain, and the system possesses flexible tuning capabilities. Appropriate settings... and It can not only optimize output characteristics, but also achieve dynamic coordination and stable guarantee of power and data transmission.

[0116] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A multi-band wireless power and information coordinated transmission system, characterized in that, It includes multiple coils, namely a transmitting coil, multiple relay coils and a receiving coil arranged at equal intervals in sequence; Each coil includes a multi-resonant frequency band circuit, which includes a compensating inductor. L m Compensating inductance L m One end is terminal one, and the other end is connected to the compensation capacitor. C m The series connection constitutes the compensation unit, and the compensation capacitor C m The other end is terminal two, resonant inductor. L p With resonant capacitor C p The series connection forms a resonant unit, and the resonant unit and the compensation capacitor C m Parallel connection; In the transmitting coil, the two ends of the high-frequency constant voltage source are connected to the first and second terminals of the multi-resonant frequency band circuit, respectively. In the relay coil, the first and second terminals of the multi-resonant band circuit are connected in phase; In the receiving coil, the load is connected to terminal one and terminal two of the multi-resonant band circuit, respectively.

2. The multi-band wireless power and information coordinated transmission system according to claim 1, characterized in that, In adjacent coils, the compensating inductance of one coil and the resonant inductance of another coil are of the same type and form a coupling pair. From the two ends toward the middle, the coil types of adjacent coupling pairs are different and are arranged alternately.

3. The multi-band wireless power and information coordinated transmission system according to claim 2, characterized in that, The coil types include DD coils and Q coils.

4. The multi-band wireless power and information coordinated transmission system according to claim 3, characterized in that, There are 3 relay coils, forming 4 coupling pairs. The coil types of the 4 coupling pairs are Q coil, DD coil, DD coil and Q coil, respectively.

5. The multi-band wireless power and information coordinated transmission system according to claim 1, characterized in that, Multiple resonant frequency points are formed by multiple resonant frequency band circuits, which serve as one power transmission channel and one or more data transmission channels respectively; a frequency shift keying modulation method based on multi-frequency point switching is adopted to realize serial data transmission between multiple data information transmission channels.

6. The multi-band wireless power and information coordinated transmission system according to claim 1, characterized in that, The physical connection between each coil is an insulator string, and the coils are all embedded in the insulator string, which is a whole unit.

7. The multi-band wireless power and information coordinated transmission system according to claim 1, characterized in that, In the same relay coil, there are two types and arrangements of resonant inductor and compensating inductor coils: one is to use DD coil and Q coil respectively, and the other is to use two DD coils, which are rotated 90 degrees relative to each other.

8. A method for optimizing variable parameters in a multi-band wireless power and information collaborative transmission system, characterized in that, include: Step 1: Construct an equivalent topology model of a multi-band wireless power and information co-transmission system that can simultaneously characterize power transmission channels and data transmission channels, including: It includes multiple coils, namely a transmitting coil, multiple relay coils and a receiving coil arranged at equal intervals in sequence; Each coil includes a multi-resonant frequency band circuit, which is an LCC compensated topology and includes a compensating inductor. L m Compensating inductance L m One end is terminal one, and the other end is connected to the compensation capacitor. C m The series connection constitutes the compensation unit, and the compensation capacitor C m The other end is terminal two, resonant inductor. L p With resonant capacitor C p The series connection forms a resonant unit, and the resonant unit and the compensation capacitor C m Parallel connection; In the transmitting coil, the two ends of the high-frequency constant voltage source are connected to the first and second terminals of the multi-resonant frequency band circuit, respectively. In the relay coil, the first and second terminals of the multi-resonant band circuit are connected in phase; In the receiving coil, the load is connected to terminal one and terminal two of the multi-resonant band circuit, respectively; Set the parameters for each compensation inductor, compensation capacitor, resonant inductor, resonant capacitor, coil mutual inductance, and load impedance resistance; Step 2: Adjust the system coupling coefficient φ and inductance offset factor p ,include: The system coupling coefficient φ is adjusted by changing the spacing, number of turns, or winding method of adjacent coils; Inductance offset factor p The value satisfies: L m = p × L p , C m = p × C p ,in L m To compensate for inductance, L p It is a resonant inductor. C m To compensate for capacitors, C p It is a resonant capacitor; Step 3: Adjust the self-inductance and equivalent load resistance of the resonant inductor in the transmitting coil. R eq And make the self-inductance of the resonant inductance and the compensating inductance in all coils the same; Step 4: Based on frequency domain characteristic analysis, select the frequency point with the highest output power and transmission efficiency from multiple resonant peak clusters as the operating frequency of the power transmission channel; calculate the output power and transmission efficiency at this frequency point. If the output power meets the transmission setting target, proceed to the next step; if not, return to Step 2 and readjust the inductor offset factor. p And the coupling coefficient 𝑘, or return to step three to adjust the resonant inductor. L p and equivalent load resistance R eq Continue until the performance indicators meet the requirements; Step 5: Select one or more frequency points from the remaining resonant peak clusters as the operating frequency of the data transmission channel; Check the difference between the operating frequency of the selected data transmission channel and the power channel, as well as the operating frequency of each data channel. If the frequency difference is greater than or equal to the set value, the demodulation margin requirement is met. If the frequency difference is less than the set value, reselect the frequency point or return to step two to adjust the system coupling coefficient φ and inductance offset factor. p To change the distribution of resonance peaks; Step Six: Calculate the voltage gain of the data transmission channel selected in Step Five, ensuring that the voltage gain of each data channel at the operating frequency is greater than or equal to the set value, so that the receiver can accurately demodulate the signal. If the voltage gain meets the requirements, the parameter optimization process ends; otherwise, return to Step Five to reselect the data channel frequency, or iteratively adjust the inductor offset factor. p Coupling coefficient φ, resonant inductance L p ,resistance R eq Continue until the gain of all data channels meets the requirements.

9. The method for optimizing variable parameters in a multi-band wireless power and information collaborative transmission system according to claim 8, characterized in that, In adjacent coils, the compensating inductance of one coil and the resonant inductance of another coil are of the same type and form a coupling pair. From the two ends toward the middle, the coil types of adjacent coupling pairs are different and are arranged alternately.

10. The method for optimizing variable parameters in a multi-band wireless power and information collaborative transmission system according to claim 8, characterized in that, In the same relay coil, there are two types and arrangements of resonant inductor and compensating inductor coils: one is to use DD coil and Q coil respectively, and the other is to use two DD coils, which are rotated 90 degrees relative to each other.

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