Three-phase wireless electric energy and signal reverse cooperative transmission system and parameter design method thereof

Abstract

The invention discloses a three-phase wireless electric energy and signal reverse cooperative transmission system and a parameter design method thereof. The system comprises a direct-current power supply, a three-phase high-frequency inverter circuit, a three-phase primary side compensation capacitor, a three-phase secondary side compensation capacitor, a three-phase primary and secondary side magnetic coupling coil, a signal transmission channel network, a signal modulation-demodulation circuit network, an encoder, a decoder, a three-phase rectification filter circuit, a filter capacitor and a load resistor. The signal transmission channel networks respectively comprise three signal injection networks and three signal separation transmission channel networks; each signal injection network comprises a secondary side signal injection transformer, a secondary side injection signal resonant capacitor and a discharge resistor; and each signal separation transmission channel network comprises a primary side signal pickup transformer, an extraction signal resonant capacitor, a wave blocking network inductor, a wave blocking network capacitor and a sampling resistor. According to the invention, three-phase wireless energy and information parallel reverse transmission is realized, and the signal transmission rate is effectively improved while stable and efficient electric energy transmission is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of synchronous transmission of electric energy signals, and in particular to a three-phase wireless electric energy and signal reverse coordinated transmission system and a parameter design method thereof. Background Art

[0002] As an unmanned aerial vehicle controlled by radio remote control equipment and its own electronic control system, drones have many advantages such as maneuverability, free system configuration, and diverse application scenarios. However, with the continuous expansion of application areas and the corresponding increase in workload, a single drone can no longer meet the work needs. Multiple drones are needed to work together to form a drone cluster to achieve higher precision, wider range, and deeper operational goals.

[0003] A swarm system composed of multiple drones offers advantages such as a stable cluster structure, a large simultaneous reconnaissance range, and complementary functions. It plays an important role in areas such as national security, smart agricultural management, and wide-area search and reconnaissance. However, drones currently rely primarily on batteries for power, facing challenges in maintaining power after long periods of standby or recycling. The power supply process still relies on manual operation, severely reducing the efficiency of drones in practical applications and hindering the development of intelligent drones.

[0004] Wireless power transmission (WPT) technology, with its advantages of flexibility, convenience, efficiency, reliability, and support for simultaneous charging of multiple devices, has shown great application potential in the autonomy and intelligence of drone systems, becoming a popular energy transmission technology solution. However, to address the current problems of drone swarms, such as the large number of charging targets, random landing locations and directions, and flexible and variable numbers, it is necessary to simultaneously achieve wireless power transmission and the pickup and identification of corresponding drone signals. Therefore, when performing wireless power transmission, information exchange is inevitably required to meet application scenarios such as charging system status detection and drone-side information upload. As a derivative technology that realizes the synchronous wireless transmission of power and signals, wireless energy and signal synchronous transmission technology provides an effective solution to global challenges such as achieving flexible power supply and communication security for drone swarms.

[0005] Existing technologies for synchronous wireless power signal transmission are mostly based on single-phase, single-channel wireless power transmission systems. As drone charging power increases, they struggle to address the electromagnetic compatibility issues of multi-frequency transmission. High frequencies can easily lead to a decrease in the system's effective power. To minimize the impact on energy transmission, signal modulation must attempt to use low-frequency, narrowband methods, which limits the overall signal transmission rate. Similarly, due to the high-efficiency energy transmission requirements of single-phase, single-channel wireless power signal transmission systems, their physical architecture is typically optimized for unidirectional transmission. Most research focuses on forward signal transmission, but reverse transmission is crucial for enabling information upload and interaction on the drone side. Therefore, research on a wireless power signal reverse cooperative transmission system that balances high-speed signal transmission with high-quality power transmission has become a hot topic in the field of wireless power signal transmission for drones. Summary of the Invention

[0006] The present invention aims to, at least to some extent, address the technical problems of the related art. To this end, a first object of the present invention is to provide a three-phase wireless power and signal reverse coordinated transmission system that can transmit power from the primary side to the secondary side, and multiple signals from the secondary side to the primary side, achieving high-quality, stable, and synchronous transmission of power and multiple high-speed signals in parallel.

[0007] The second object of the present invention is to provide a parameter design method for a three-phase wireless power and signal reverse coordinated transmission system.

[0008] To achieve the above object, the present invention is implemented through the following technical solutions:

[0009] A three-phase wireless power and signal reverse coordinated transmission system, comprising: a DC power supply, a three-phase high-frequency inverter circuit, a three-phase primary compensation capacitor, a three-phase secondary compensation capacitor, a three-phase primary magnetic coupling coil, a three-phase secondary magnetic coupling coil, a signal transmission channel network, a signal modulation and demodulation circuit network, an encoder, a decoder, a three-phase rectifier and filter circuit, a filter capacitor, and a load resistor;

[0010] The midpoint of each phase bridge arm of the three-phase high-frequency inverter circuit is connected to the corresponding primary magnetic coupling coil via the corresponding primary compensation capacitor, and the midpoint of each phase bridge arm of the three-phase rectifier filter circuit is connected to the corresponding secondary magnetic coupling coil via the corresponding secondary compensation capacitor;

[0011] The signal transmission channel network includes three signal injection networks and three signal separation transmission channel networks respectively; wherein each signal injection network includes a secondary-side signal injection transformer, a secondary-side signal injection resonant capacitor and a discharge resistor, the primary-side coil of the secondary-side signal injection transformer is connected in series with the secondary-side signal injection resonant capacitor and the discharge resistor, and the secondary-side coil of the secondary-side signal injection transformer is connected to the corresponding secondary-side magnetic coupling coil and secondary-side compensation capacitor, respectively, to form a secondary-side power transmission channel;

[0012] Each signal separation transmission channel network includes a primary signal pickup transformer, an extracted signal resonant capacitor, a wave-blocking network inductor, a wave-blocking network capacitor and a sampling resistor, wherein the primary side coil of the primary signal pickup transformer is connected in parallel with the extracted signal resonant capacitor, and the coordinated wave-blocking network capacitor is respectively connected in parallel with the wave-blocking network inductor and the sampling resistor, wherein the wave-blocking network inductor and the wave-blocking network capacitor constitute a wave-blocking network for blocking low-frequency energy transmission and identifying the spectrum characteristics of the local signal, and the secondary side coil of the primary signal pickup transformer is respectively connected with the corresponding primary compensation capacitor and the primary magnetic coupling coil, and constitutes a primary power transmission channel.

[0013] In a possible implementation, the three-phase primary magnetic coupling coils and the three-phase secondary magnetic coupling coils are connected in a star connection.

[0014] In one possible implementation, the modulation waveform transmitted in the circuit topology of the system is a composite modulation wave, which includes one electric energy modulation wave and three high-frequency signal modulation waves, wherein each signal injection network is used to inject a corresponding one high-frequency signal modulation wave, and the three high-frequency signal modulation waves injected by the three signal injection networks are combined with one electric energy modulation wave to obtain the composite modulation wave; each of the signal separation transmission channel networks is used to perform signal separation on the received composite modulation wave to obtain a high-frequency signal modulation wave of the corresponding frequency.

[0015] In a possible implementation, the signal modulation and demodulation circuit network includes a signal modulation circuit network and a signal demodulation circuit network;

[0016] The signal modulation circuit network includes a controller and a power amplifier. The signal modulation circuit network is connected to the encoder. The encoder is used to encode the baseband signal generated by the signal generator to obtain three parallel binary sequences. The controller is used to modulate the three parallel binary sequences using a 2ASK modulation method, and input the modulated three high-frequency signal modulated waves into the power amplifier for amplification processing, and input the amplified three high-frequency signal modulated waves into the corresponding signal injection network.

[0017] The signal demodulation circuit network includes three signal demodulation circuits, each signal demodulation circuit includes a bandpass filter, a multiplier, a low-pass filter, and a sampling decision device, and the signal demodulation circuit network is connected to the decoder;

[0018] Among them, the voltage signal sampled on the corresponding sampling resistor is filtered by a bandpass filter, and the filtered signal is input into the multiplier to separate the high-frequency carrier component and the low-frequency baseband signal component, highlighting code element 0 and code element 1, and a low-pass filter is used to filter out the corresponding high-frequency carrier component. A sampling decision device is used to make a decision and output three parallel binary sequences. The three parallel binary sequences are sampled and processed by a decoder and then converted from parallel to serial to restore the original high-speed serial data.

[0019] In one possible implementation, the system uses frequency division multiplexing transmission technology to divide the total bandwidth used for transmission into four sub-bands for transmission of power and signals;

[0020] The 2ASK modulation signal bandwidth of each sub-channel is twice the bandwidth of the corresponding baseband signal, and the center frequency is located at the corresponding carrier signal frequency.

[0021] In a possible implementation, the frequency of each carrier wave of the system is greater than the bandwidth of the corresponding baseband signal.

[0022] In one possible implementation, the carrier frequencies of each channel of the system are arranged in ascending order according to the number of channel phases, and the interval between the signal carrier frequencies between adjacent phases is greater than the sum of 2 times the baseband signal bandwidth and the protection bandwidth, wherein the protection bandwidth is the isolation band set between adjacent sub-bands.

[0023] In a possible implementation, each signal separation transmission channel network operates in an underdamped state so that the duration of the transient process at the moment of switching between the transmission symbol 0 and the transmission symbol 1 is shorter than that of a single symbol of the baseband signal.

[0024] To achieve the above-mentioned object, the second aspect of the present invention provides a parameter design method for a three-phase wireless power and signal reverse coordinated transmission system, which is used to design the above-mentioned system, and the method includes:

[0025] Determine the transmission frequency of the serial bit, and determine the frequency values ​​of the power modulation wave and the three-way high-frequency signal modulation wave according to the transmission frequency;

[0026] The initial values ​​of the circuit component parameters in the signal transmission and reception circuits are predetermined based on the frequency values ​​of the power modulation wave, the three-way high-frequency signal modulation wave, the power channel resonance filtering condition, the power transmission efficiency, and the signal transmission gain constraint condition; wherein the power channel resonance filtering condition requires that the system resonate at a preset frequency, and the signal transmission gain constraint condition includes maximizing the gain of the in-phase signal and minimizing the crosstalk between adjacent-phase signals;

[0027] The mutual inductance matrix of the three-phase primary and secondary magnetic coupling coils and the three-phase primary and secondary compensation capacitors are determined according to the load power and power transmission efficiency.

[0028] In a possible implementation, the following judgment conditions are also used to determine whether the design parameters meet the preset requirements:

[0029] A signal gain verification condition, wherein the signal gain verification condition is whether the in-phase signal gain is greater than a preset value;

[0030] A crosstalk verification condition, wherein the crosstalk verification condition is whether the voltage value of the power interference signal is less than a set value;

[0031] The adjacent phase crosstalk verification condition is whether the signal-to-noise ratio of the signal receiving end is greater than a set value.

[0032] The present invention has at least the following technical effects:

[0033] The present invention provides a three-phase wireless power and signal reverse coordinated transmission system. This system can perform the basic tasks of forward power transmission and multi-path signal reverse coordinated transmission. It significantly improves the system's signal transmission rate, reduces cross-coupling between signal and power circuits, simplifies the system's structural design, and improves the system's power transmission quality. Furthermore, the present invention provides a system parameter design method, which can be used to design a three-phase wireless power and signal reverse coordinated transmission system capable of achieving the above-mentioned functions.

[0034] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Schematic diagram of the circuit structure of a three-phase wireless power and signal reverse coordinated transmission system according to an embodiment of the present invention.

[0036] Figure 2 2 is a schematic diagram of the signal modulation and demodulation circuit structure according to an embodiment of the present invention.

[0037] Figure 3 FIG. 4 is an equivalent circuit diagram of an electric energy transmission circuit according to an embodiment of the present invention.

[0038] Figure 4 FIG. 4 is an equivalent circuit diagram of energy interference analysis according to an embodiment of the present invention.

[0039] Figure 5 FIG. 4 is an equivalent circuit diagram of signal-to-energy interference analysis according to an embodiment of the present invention.

[0040] Figure 6 This is a simulation waveform diagram of single-channel signal transmission interference according to an embodiment of the present invention.

[0041] Figure 7 FIG. 4 is an equivalent circuit diagram for signal transmission gain analysis according to an embodiment of the present invention.

[0042] Figure 8 This is a simulation waveform diagram of the single-channel signal transmission gain according to an embodiment of the present invention.

[0043] Figure 9 This is a transfer gain curve diagram of the signal transmission loop resonant capacitor parameter design according to an embodiment of the present invention.

[0044] Figure 10 This is a simulation waveform diagram of crosstalk in adjacent phase signal transmission according to an embodiment of the present invention.

[0045] Figure 11 The signal interference curve diagram is designed for the resonant capacitance parameters of the signal transmission loop according to an embodiment of the present invention.

[0046] Figure 12 This is a waveform diagram of the parallel binary signal demodulation process of the simulation system according to an embodiment of the present invention.

[0047] Figure 13 Schematic diagram of parallel binary delay in the signal demodulation process according to an embodiment of the present invention.

[0048] Figure 14 Schematic diagram comparing signal transmission between a three-way signal transmitting end and a receiving end according to an embodiment of the present invention. DETAILED DESCRIPTION

[0049] The present embodiment is described in detail below. Examples of the embodiment are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and are not to be construed as limiting the present invention.

[0050] The following describes the three-phase wireless power and signal reverse coordinated transmission system and parameter design method of this embodiment with reference to the accompanying drawings.

[0051] First, the system structure of the three-phase wireless power and signal reverse cooperative transmission system of this embodiment is introduced. Then, the system transmission efficiency, transmission power, energy-signal interference impact, and signal transmission gain are analyzed. Through multi-dimensional analysis, a parameter design method of the system is obtained to design a system that can improve the system signal transmission rate, system transmission efficiency, transmission power, and reduce cross-coupling between signal and power circuits, which can realize energy-signal synchronous transmission.

[0052] Figure 1 FIG. 1 is a circuit diagram of a three-phase wireless power and signal reverse coordinated transmission system according to an embodiment of the present invention. Figure 1 As shown, the system includes: DC power supply E, three-phase high-frequency inverter circuit, three-phase primary and secondary compensation capacitors C p1 、C p2、C p3 、C s1 、C s2 、C s3 , three-phase primary and secondary magnetic coupling coils, encoder, signal transmission channel network, signal modulation and demodulation circuit network, decoder, three-phase rectifier filter circuit, filter capacitor C f , load resistance R L The three-phase high-frequency inverter circuit includes six fully controlled MOSFETs (field-effect transistors), which are affected by duty cycle changes to control the gate level and thus control the length of their conduction time.

[0053] In this embodiment, the midpoint of each phase bridge arm of the three-phase high-frequency inverter circuit is connected to the corresponding primary magnetic coupling coil through the corresponding primary compensation capacitor (for example, the midpoint of the bridge arm of the A-phase high-frequency inverter circuit is connected to the corresponding primary magnetic coupling coil through the C p1 With L A The midpoint of each bridge arm of the three-phase rectifier filter circuit is connected to the corresponding secondary magnetic coupling coil through the corresponding secondary compensation capacitor (for example, the midpoint of the bridge arm of the a-phase rectifier filter circuit is connected to the corresponding secondary magnetic coupling coil through C s1 With L a connect).

[0054] The three-phase magnetic coupling coil is three pairs of magnetic coupling inductor coils, including the primary magnetic coupling coil L A , L B , L C , and the secondary magnetic coupling coil L a , L b , L c , the coils are connected in star connection.

[0055] In this embodiment, the signal transmission channel network includes three signal injection networks and three signal separation transmission channel networks; wherein each signal injection network includes a secondary side signal injection transformer, a secondary side signal injection resonant capacitor and a discharge resistor (respectively as the secondary side a phase T S1 、C sa and R sa ), the primary side coil of the secondary side signal injection transformer is connected in series with the secondary side signal injection resonant capacitor and the discharge resistor, and the secondary side coil of the secondary side signal injection transformer is connected with the corresponding secondary side magnetic coupling coil and secondary side compensation capacitor respectively, and constitutes a secondary side power transmission channel.

[0056] Each signal separation transmission channel network includes a primary side signal pickup transformer, a signal extraction resonant capacitor, a wave blocking network inductor, a wave blocking network capacitor and a sampling resistor (respectively as the primary side A phase T p1 、C ra1 , L ra 、C ra 、R ra), wherein, after the primary side coil of the primary side signal pickup transformer is connected in parallel with the extracted signal resonant capacitor, the collaborative wave-blocking network capacitor is respectively connected in parallel with the wave-blocking network inductor and the sampling resistor, wherein the wave-blocking network inductor and the wave-blocking network capacitor constitute a wave-blocking network for realizing the blocking of low-frequency energy transmission and the identification of the spectrum characteristics of the local signal, the secondary side coil of the primary side signal pickup transformer is respectively connected with the corresponding primary side compensation capacitor and the primary side magnetic coupling coil, and constitutes a primary side power transmission channel.

[0057] Specifically, the reverse parallel transmission mode of electric energy and signal is a series injection mode, that is, a signal coupling transformer is added to the secondary side of the resonant topology to realize signal injection, and a signal pickup transformer is added to the primary side to realize signal extraction, wherein the primary magnetic coupling coil L A , L B , L C , primary compensation capacitor C p1 、C p2 、C p3 , the primary side signal pickup transformer forms the primary side power transmission channel; the secondary side magnetic coupling coil L a , L b , L c , secondary side compensation capacitor C s1 、C s2 、C s3 , the secondary side signal is injected into the transformer to form the secondary side power transmission channel, among which the secondary side magnetic coupling coil L a , L b , L c , secondary side compensation capacitor C s1 、C s2 、C s3 , the secondary side signal is injected into the transformer to resonate about the power modulation wave frequency f0.

[0058] In addition, the three-way secondary side injection signal resonant capacitor C sa 、C sb 、C sc The addition of can realize that the secondary side signal can be fully injected into the power transmission topology, reducing the power loss in the power transmission loop.

[0059] In one possible implementation, the modulation waveform transmitted in the circuit topology of the system is a composite modulation wave, which includes one electric energy modulation wave and three high-frequency signal modulation waves, wherein each signal injection network is used to inject a corresponding one high-frequency signal modulation wave, and the three high-frequency signal modulation waves injected by the three signal injection networks are combined with the one electric energy modulation wave to obtain the composite modulation wave; each signal separation transmission channel network is used to perform signal separation on the received composite modulation wave to obtain a high-frequency signal modulation wave of the corresponding frequency.

[0060] Specifically, the three-phase wireless energy transmission topology contains one power modulation wave and three high-frequency signal modulation waves, and its composite modulation wave function f r (t) is:

[0061] f r (t)=a0sin2πf0t+a1sin2πf1t+...+a3sin2πf3t (1)

[0062] Where f0 is the power transmission modulation frequency, and a0 is the power transmission modulation amplitude. f1...f3 are the modulation frequencies, and a1...a3 are the modulation amplitudes, of the three signal transmission channels. Based on frequency division multiplexing (FDM) transmission technology, the total bandwidth used for transmission is divided into four sub-bands for power and signal transmission.

[0063] The secondary side signal injection transformer adds multiple signal modulation waves into the power transmission circuit and superimposes them with the power modulation wave. The three parallel binary signal sequences output by the high-speed serial bit encoder are converted and output through the power amplifier to realize the setting of the three-way signal transmission carrier amplitude. The power transmission modulation wave and the high-frequency signal wave are combined to form a composite pulse wave for transmission in the power transmission circuit.

[0064] It should be noted that the three parallel binary baseband signals use a 2ASK (binary amplitude shift keying) modulation strategy. The spectral bandwidth of the 2ASK modulated signal for each subchannel is twice the baseband signal bandwidth, with the center frequency located at the corresponding carrier signal frequency. To ensure the integrity of the modulated signal, the carrier frequency of each channel must be greater than the corresponding baseband signal bandwidth. To prevent aliasing of the three subchannel spectra, the carrier frequencies must be arranged in ascending order by the number of channel phases, and the spacing Δf between the signal carrier frequencies of adjacent phases must be greater than 2×(baseband signal bandwidth) + (guard bandwidth). The guard bandwidth is a specially designed isolation band set between adjacent subbands to prevent aliasing of the signal voltage spectra of adjacent phases.

[0065] In one embodiment of the present invention, a signal modulation and demodulation circuit network includes a signal modulation circuit network and a signal demodulation circuit network; the signal modulation circuit network includes a controller and a power amplifier, and the signal modulation circuit network is connected to an encoder. In this embodiment, the encoder is used to encode the baseband signal generated by the signal generator to obtain three parallel binary sequences; the controller is used to modulate the three parallel binary sequences using 2ASK modulation, and after modulation, respectively input them into the power amplifier for amplification processing, and input the amplified three high-frequency signal modulated waves into the corresponding signal injection network; the signal demodulation circuit network includes three signal demodulation circuits, each signal demodulation circuit including a bandpass filter, a multiplier, a low-pass filter, and a sampling decision device, and the signal demodulation circuit network is connected to a decoder.

[0066] Among them, the voltage signal sampled on the corresponding sampling resistor is filtered by a bandpass filter, and the filtered signal is input into a multiplier to separate the high-frequency carrier component and the low-frequency baseband signal component, highlighting code element 0 and code element 1, and a low-pass filter is used to filter out the corresponding high-frequency carrier component. A sampling decision device is used to make a decision and output three parallel binary sequences. The three parallel binary sequences are sampled and processed by a decoder and converted from parallel to serial to restore the original high-speed serial bit data stream.

[0067] Specifically, the signal modulation and demodulation circuit network in this embodiment uses a signal generator to generate a baseband signal, obtains the original high-frequency carrier signal by multiplying it with a set high-frequency carrier, and injects it into the secondary signal transmission loop through a power amplifier; the signal demodulation circuit network uses coherent demodulation, and three signal demodulation circuits consisting of a bandpass filter, a multiplier, a low-pass filter, and a sampling decision device together constitute the signal demodulation circuit network.

[0068] More specifically, three signal transmission channels are selected as examples for analysis, with the parallel transmission of electric energy and serial binary bits at rates of 200 kbit / s, 250 kbit / s, and 300 kbit / s, respectively. Taking into account the parameter design conditions, the electric energy modulation wave frequency f0 = 85 kHz is selected, the modulation wave characteristic frequency f1 = 2.4 MHz corresponding to signal channel 1, the modulation wave characteristic frequency f2 = 2.8 MHz corresponding to signal channel 2, and the modulation wave characteristic frequency f3 = 3.1 MHz corresponding to signal channel 3.

[0069] The three signal modulation waves with frequencies of f1, f2, and f3 are multiplied by the corresponding three baseband signals. After being output by the power amplifier, a high-frequency signal modulation wave voltage with baseband signal information is obtained. After being filtered by the secondary signal injection loop, the secondary signal is injected into the transformer and transmitted to the secondary power transmission topology, and then transmitted to the primary signal pickup transformer of the corresponding phase through the three-phase magnetic coupling coil.

[0070] The signal separation transmission channel network includes three parallel RLC series resonant filter circuits. The resonant frequencies are set to the signal frequencies f1, f2, and f3 of the corresponding channels. The filtering characteristics of the RLC series resonance are used to filter out the characteristic frequencies of the corresponding signals in each channel to complete the signal separation. ra1 ,C ra2 ,C ra3 Compensation can be performed for each signal transmission channel. To avoid crosstalk between signal transmission and power transmission, power transmission and signal transmission, the quality factor (Q) of each signal separation transmission channel must be greater than 300.

[0071] It can be understood that the sampling resistor R in the signal separation transmission channel network can be ra 、R rb 、Rrc The voltage on the sensor is collected and used as the input of the signal demodulation circuit network for signal demodulation.

[0072] The signal demodulation circuit network is sampled using coherent demodulation, such as Figure 2 As shown, the sampling resistor R ra 、R rb 、R rc The collected voltage passes through a bandpass filter to remove non-characteristic frequency signals from the collected voltage. A multiplier then multiplies the set carrier by the collected voltage, highlighting the "0" and "1" code element characteristics of the baseband signal. A low-pass filter then extracts the waveform envelope, and the sampling decision device makes a final decision. After setting the sampling period, the "0" and "1" code elements of the received signal are decoupled and restored. The signal separation and transmission channel network and the signal demodulation circuit network together constitute the signal reception and transmission channel.

[0073] It should be noted that the encoder can add a special code group of n bits at the beginning of the high-speed serial bits as a flag to mark the start of transmission. It then performs serial-to-parallel conversion to form three parallel binary sequences. After transmission to the secondary side, the decoder performs sampling and parallel-to-serial conversion to multiplex the high-speed serial bits. Both can be implemented by microcontroller programming.

[0074] The system's operating principle is to control the duty cycle of the three-phase full-bridge inverter and set the phase angles of adjacent phases of the A, B, and C bridge arms to 120° to achieve a stable three-phase voltage output. After determining the control method, the signal is modulated and demodulated.

[0075] The signal modulation method is as follows: an amplitude modulation strategy is adopted for three parallel binary sequences, and each baseband signal is multiplied by an analog high-frequency sine wave through a multiplier to obtain a high-frequency AC sine signal carrying baseband signal information.

[0076] The signal demodulation method is:

[0077] The signal separation channel network includes three parallel RLC series resonant filter circuits and LC parallel resonant wave blocking networks. The inherent resonant frequencies of the two are set to the signal modulation wave frequencies f1, f2, and f3 of the corresponding channels. The filtering characteristics of the RLC series resonance and the LC parallel wave blocking network are used to filter out the corresponding signal modulation wave frequency of each channel to complete the signal separation. ra 、R rb 、R rc The voltage of each transmission signal can be extracted.

[0078] For the transient response time of the signal, according to the transient differential equation of the circuit, the duration of the transient process at the conversion moment t pIt is related to the selection of the parameters of the RLC series second-order system and the LC parallel wave-blocking network. By selecting appropriate capacitance and inductance parameters, the signal separation network can work in an underdamped state, and the duration of the transient process of the conversion between the transmission "0" code element and the "1" code element is t p Less than the baseband signal individual symbol T s , which lays the foundation for subsequent judgment sampling.

[0079] The signal demodulation circuit adopts coherent demodulation, that is, the resistor R ra 、R rb 、R rc The collected voltage U ra 、U rb 、U rc The noise generated in the signal transmission circuit and the high-frequency harmonics in the power transmission circuit are filtered out through a band-pass filter to ensure that the signal decoupling is not interfered with by other frequency signal voltages. The high-frequency carrier component in the collected voltage is then separated from the low-frequency baseband signal component through a multiplier, highlighting the signal characteristics of the code elements "0" and "1" in the baseband signal component. The corresponding high-frequency carrier component is filtered out using a low-pass filter and enters the decision device for decision and output of 3 parallel binary sequences. Since the transient process duration t at the moment of conversion between the "0" code element and the "1" code element is p Less than the baseband signal signal individual symbol T s , will not affect the accuracy of decoder sampling.

[0080] The encoder adds a special n-bit code group to the beginning of the high-speed serial bit stream, marking the start of transmission. The data enters the serial-to-parallel converter, converts it into a three-way parallel binary sequence, and is fed into the controller for 2ASK signal modulation before being output to the power amplifier, achieving signal voltage output.

[0081] The decoder consists of a sampling shift register and a parallel / serial converter. The decoder starts decoding after detecting the special code group that marks the start of transmission. The duration of the transient process of the transition between the "0" code element and the "1" code element of the three-way baseband signal is t p Less than the baseband signal signal single code element transmission period T s , so the sampling register sends period T in binary parallel sequence s Sampling ensures the accuracy of each sampled symbol, and after unifying the clock, three parallel binary sequences are output. After parallel-to-serial conversion, the three binary parallel sequences are multiplexed into the original high-speed serial bits.

[0082] After determining the system architecture and working principle, the system transmission efficiency and output power are analyzed.

[0083] Specifically, based on the system circuit, we can solve the influence of the signal coupling circuit mode on the power transmission topology and determine the system power output power expression P out And the efficiency expression η:

[0084] (1) Under the action of three-way signal modulation wave, according to the attached Figure 1 Since the signal loop structures among the three phases are consistent, the impedance of the A phase signal transmission loop is calculated as follows:

[0085]

[0086] Among them, Z ra R is the equivalent impedance of the primary signal receiving circuit input under the frequency of the power modulation wave, ra is the A-phase signal receiving resistance, ω0 is the characteristic angular frequency of the power modulation wave, L ra is the inductance of the wave-blocking network, C ra is the wave-blocking network capacitance, L ra1 、C ra1 are the inductance of the coupling coil at the signal receiving end, the parallel capacitance of the coupling coil at the signal receiving end, and Z rA is the equivalent impedance of the secondary signal transmission circuit under the action of the power modulation wave, R sa is the discharge resistance of the signal transmitting end, L sa is the inductance of the coupling coil at the signal transmitting end, C sa Inject signal resonant capacitor to the secondary side, Z m is the equivalent impedance of the secondary signal in the power transmission circuit under the action of the power modulation wave, M is the mutual inductance of the signal receiving and transmitting coils, and Z is the total impedance of the signal circuit. In the A phase circuit, they are Z ra With Z rA .

[0087] Through analysis, since the resonant frequency ω1 set in the signal loop is a MHz-level high-frequency carrier, which is very different from the power modulation wave, the equivalent impedance Z ra 、Z rA It is extremely large at the frequency of the power modulation wave, so when equivalent in the power transmission circuit, its equivalent impedance Z m Very small, so can be ignored.

[0088] (2) The power transmission circuit is analyzed, and its equivalent circuit topology is as follows Figure 3 As shown, for the three-phase magnetic coupling coil, each coil will be coupled with the other five coils. According to the primary and secondary side structure analysis, we can get:

[0089]

[0090] Among them, M ABis the mutual inductance between the primary A-phase magnetic coupling coil and the primary B-phase magnetic coupling coil, M BC is the mutual inductance between the primary B-phase magnetic coupling coil and the primary C-phase magnetic coupling coil, M CA is the mutual inductance between the primary C-phase magnetic coupling coil and the primary A-phase magnetic coupling coil, M ab is the mutual inductance between the secondary side a phase magnetic coupling coil and the secondary side b phase magnetic coupling coil, M bc is the mutual inductance between the secondary b-phase magnetic coupling coil and the secondary c-phase magnetic coupling coil, M ca is the mutual inductance between the secondary side c phase magnetic coupling coil and the secondary side a phase magnetic coupling coil, M1 is the first mutual inductance value, M Aa is the mutual inductance between the primary A-phase magnetic coupling coil and the secondary a-phase magnetic coupling coil, M Bb is the mutual inductance between the primary B-phase magnetic coupling coil and the secondary b-phase magnetic coupling coil, M Cc is the mutual inductance between the primary C-phase magnetic coupling coil and the secondary C-phase magnetic coupling coil, M2 is the second mutual inductance value, M Ab is the mutual inductance between the primary A-phase magnetic coupling coil and the secondary b-phase magnetic coupling coil, M Bc is the mutual inductance between the primary B-phase magnetic coupling coil and the secondary C-phase magnetic coupling coil, M Ca is the mutual inductance between the primary C-phase magnetic coupling coil and the secondary a-phase magnetic coupling coil, M3 is the third mutual inductance value, M Ac is the mutual inductance between the primary A-phase magnetic coupling coil and the secondary C-phase magnetic coupling coil, M Ba is the mutual inductance between the primary B-phase magnetic coupling coil and the secondary a-phase magnetic coupling coil, M Cb is the mutual inductance between the primary C-phase magnetic coupling coil and the secondary b-phase magnetic coupling coil, and M4 is the fourth mutual inductance value.

[0091] Since three-phase half-bridge inverter is used, the relationship between the fundamental effective value U of each phase output voltage of the inverter and the DC power supply voltage E can be expressed as:

[0092]

[0093] In the three-phase bridge rectifier circuit, according to the power conservation law:

[0094]

[0095] Among them, R eq Indicates the load equivalent resistance.

[0096] After listing the mesh equations using Kirchhoff's voltage law, the primary and secondary current expressions of the three-phase magnetic coupling coils in this system can be calculated as:

[0097]

[0098] Among them, I PA , I PB , I PC , I DA , I DB , I DC are the currents of primary phase A, B, and C, and secondary phase a, b, and c respectively, and ω is the system power transmission angular frequency.

[0099] (3) Based on I DA , I DB , I DC The relationship between them is obtained, and the expression of load output power under the action of electric energy modulation wave frequency is obtained as follows:

[0100]

[0101] Among them, P is the load output power under the action of the power modulation wave frequency.

[0102] (4) System efficiency η can be expressed as:

[0103]

[0104] Take the equivalent inductance M eq After expressing mutual induction:

[0105]

[0106] The system efficiency can be simplified as:

[0107]

[0108] Select the optimal mutual inductance value M based on the expression of load output power and system efficiency under the action of power modulation wave frequency eq .

[0109] Furthermore, the impact of energy signal interference is analyzed.

[0110] When analyzing the impact between the signal transmission circuit and the energy transmission channel, two issues need to be considered. The first is the interference effect of the same-phase primary power transmission circuit on the signal receiving end. Since the three-phase signal transmission circuit design is the same, the system takes the A-phase signal transmission as an example. According to the characteristics of the wave blocking network, L ra with C ra The resonant frequency is much lower than the energy channel transmission frequency f0. Therefore, under the drone charging power conditions, the current through the A-phase coil is much higher than the current flowing through the signal coil. After subsequent filtering, the energy received in the signal transmission loop is extremely small. However, the power carrier is a major noise source in data communication, so it is necessary to evaluate the crosstalk generated by power transmission.

[0111] First, since the three-phase signal transmission circuit design structure is the same, taking the A-phase energy signal crosstalk analysis as an example, the equivalent circuit of energy interference to signal is made as follows Figure 4 As shown, where Z pf1 is the total impedance of the equivalent circuit, Z pf2 is the equivalent impedance of the signal receiving circuit, Z pf3 is the equivalent impedance of the signal filtering network, and its expression can be obtained by calculation:

[0112]

[0113] Among them, L d is the signal coupling coil inductance.

[0114] The transfer functions of each part can be derived:

[0115]

[0116] Among them, M dr is the mutual inductance of the signal coupling coil, G pf1 , G pf2 , G pf3 , G pf4 They are the overall transfer gain of energy-signal interference, the transfer gain of signal coupling coil, the transfer gain of signal receiving loop, and the transfer gain of signal filtering loop.

[0117] According to the above formula, the power interference output voltage U on both sides of the data receiving resistor can be calculated pf for:

[0118]

[0119] Among them, G pf is the signal-to-interference gain, U in is the power transmission voltage, G pfi is the gain of each part of the interference loop, and ω1 is the angular frequency of power transmission.

[0120] The second is to analyze the interference of secondary signal transmission on the same-phase power transmission, and analyze the A-phase energy transmission channel. Since only the interference of the signal on the same-phase power transmission is analyzed, the equivalent voltage source generated by the three-phase coil is ignored. The equivalent circuit is as follows: Figure 5 As shown. In the signal transmission loop, the equivalent impedances of the signal transmitting end and the receiving end are Z dt and Z dr , whose expression is:

[0121]

[0122] Among them, L sa1 The inductance of the primary coil of the transformer that injects the secondary signal, L ra1is the primary side signal pickup transformer’s primary side coil inductance, and R0 is the aforementioned A-phase sampling resistor.

[0123] Through the coupling coil, the energy transmission loop reflection impedance corresponding to the signal transmitter and the receiver can be calculated as Z dT and Z dR :

[0124]

[0125] Since the energy channel transmission frequency is much smaller than the signal transmission frequency, it can be inferred from the formula that the impedance Z dt With Z dr In high impedance state, so its corresponding reflected impedance Z dT With Z dR The circuit is in a low-impedance state. This can ultimately be simplified to an inductor with minimal inductance. The above analysis confirms that the influence of the signal on energy transmission during system energy transmission is negligible, and the signal transmission loop can ultimately be equivalent to an inductor with minimal inductance. This inductance was ultimately taken into account in system parameter selection, with the resonant capacitor design utilizing the three-phase coil self-inductance and the equivalent inductance of the signal loop.

[0126] Through system simulation analysis, we can get the interference simulation waveform from the energy channel during signal transmission, such as Figure 6 As shown, its amplitude is extremely small compared to the transmitted signal amplitude.

[0127] Furthermore, signal transmission gain analysis is performed.

[0128] Since the power and multi-channel signals of this system are transmitted to the secondary side through the same pair of three-phase magnetic coupling coils, the energy transmission and signal transmission will affect each other, and corresponding crosstalk will also be generated between adjacent phase signals.

[0129] From the above analysis, we can conclude that under the transmission characteristics of the signal modulation wave frequencies f1, f2, and f3, the transmission frequencies between the system power and the signal are extremely different, and the crosstalk between the power and the signal can be ignored. Therefore, the signal transmission gain will be analyzed below.

[0130] (1) Analysis of in-phase signal transmission gain

[0131] In order to achieve high-quality data transmission, the channel bandwidth of the data transmission loop needs to be increased during the system design process to weaken the interference from the high-frequency harmonics of energy transmission. Since the inverter voltage of the three-phase system is designed to be an 85Khz square wave, the signal modulation wave frequency is designed to be 2.4Mhz (27th to 29th harmonics), 2.8Mhz (31st to 33rd harmonics), and 3.1Mhz (35th to 37th harmonics). The equivalent circuit analysis of the system is as follows: Figure 7 shown.

[0132] Since the signal transmission circuits between the three phases of this system are exactly the same, we take the signal transmission between phase A as an example and analyze it using KCL (Kirchhoff's current law) and KVL (Kirchhoff's voltage law) to obtain the signal transmission voltage U of phase A. A :

[0133]

[0134] Among them, R0 is the discharge resistor of the secondary side signal injection network, which is also the same as the phase A sampling resistor, C da The resonant capacitor of the A-phase secondary side signal injection network, I 1a The current flowing through the A-phase secondary signal injection network, I 3a is the current flowing through the primary magnetic coupling coil of phase A.

[0135] At this time, for the B-phase and C-phase secondary side signal transmission circuits, there are:

[0136]

[0137] Among them, C db The resonant capacitor of the B-phase secondary signal injection network, I 1b The current flowing through the B-phase secondary signal injection network, I 3b is the current flowing through the primary magnetic coupling coil of phase B; C dc The resonant capacitor of the C-phase secondary side signal injection network, I 1c The current flowing through the C-phase secondary signal injection network, I 3c is the current flowing through the primary magnetic coupling coil of phase C.

[0138] Since there is cross-coupling among multiple pairs of coils, the equivalent voltage source theorem can be used to analyze the secondary power transmission circuit of the three phases A, B and C:

[0139]

[0140] Among them, C 1a 、C 1b 、C 1c They are the compensation capacitors for phase a, phase b, and phase c on the secondary side, R E is the load equivalent resistance, I 3a is the current flowing through the primary magnetic coupling coil of phase A, I 4a , I 4b , I 4c They are the currents flowing through the primary side of the primary signal pickup transformer in phases A, B, and C respectively.

[0141] Similarly, the primary power transmission circuit of three phases A, B and C is analyzed:

[0142]

[0143] Among them, C 2a 、C 2b 、C 2c They are the primary compensation capacitors of phase A, phase B, and phase C, respectively. 6a , I 6b , I 6c a, b, c are the three-phase signal transmission coupling coil currents respectively.

[0144] The signal voltage of each phase is transmitted to the filter capacitor through the signal transmitting coil and can be analyzed as follows:

[0145]

[0146] Among them, L D is the self-inductance of the signal transmitting coil, I 7a , I 7b , I 7c They are the series capacitor current of the three-phase signal transmission circuit, C 3a 、C 3b 、C 3c Capacitors are connected in series to the three-phase signal receiving circuit respectively.

[0147] The KCL and KVL analysis of the wave blocking network designed for each phase signal are as follows:

[0148]

[0149] Among them, L da , L db , L dc They are the self-inductance of the three-phase signal receiving coil, I 8a , I 8b , I 8c They are the currents flowing through the inductance of the three-phase signal receiving circuit, C 4a 、C 4b 、C 4c They are the three-phase signal blocking network capacitors respectively.

[0150] Finally, for the signal receiving resistor:

[0151]

[0152] Wherein, R is the signal receiving resistance.

[0153] The combination of equations (15) to (21) can be substituted into the expression of the signal voltage transmission gain between phases Aa of the system:

[0154]

[0155] Among them, GA-a is the signal voltage transmission gain between phases Aa of the system, U oa is the voltage on the A-phase signal receiving resistor.

[0156] Through system simulation analysis, we can get the simulation waveform of the in-phase signal transmission gain as shown below: Figure 8 shown.

[0157] Since the system coil parameters, system power, and three-phase signal transmission frequency have been determined above, the signal transmission loop parameter design is the goal. The tentative system simulation parameters are shown in Table 1:

[0158] Table 1 Signal transmission simulation parameter design table

[0159]

[0160]

[0161] The relationship between the in-phase signal transmission gain, the capacitance of the wave-blocking network, and the resistance of the signal receiving resistor is obtained by calculation as follows: Figure 9 As shown in the figure, it is easy to see that the signal transmission gain shows a trend of first increasing and then decreasing as the capacitance of the wave-blocking network increases. After subsequent simulation tests, appropriate parameters of the wave-blocking network electrical components and signal receiving resistor values ​​are selected.

[0162] (2) Crosstalk analysis of adjacent phase signal transmission

[0163] Since the system is a three-phase signal transmitted through the same pair of three-phase magnetic coupling coils, it is necessary to perform a gain analysis on the crosstalk between adjacent phase signals. Taking the A-phase signal receiving resistor receiving the B-phase transmission signal voltage as an example, according to the above formulas (15) to (21), it can be obtained that the voltage U on the receiving resistor of the A-phase signal receiving channel under the action of the B-phase signal carrier frequency f2 is oa With the B phase signal transmission voltage U B The crosstalk gain expression is:

[0164]

[0165] Among them, G B-a The voltage U on the A-phase signal receiving resistor oa With the B phase signal transmission voltage U B Crosstalk gain.

[0166] Similarly, through system simulation analysis, the corresponding simulation waveform of crosstalk analysis between adjacent phase signal transmission can be obtained as follows: Figure 10 shown.

[0167] Similarly, by substituting the preset parameters, we can get the curve of crosstalk gain changing with the parameters of the blocking network, as shown in the figure: Figure 11As shown in the figure, it can be seen that the adjacent phase crosstalk first increases and then decreases as the capacitance of the wave-blocking network resonant capacitor increases.

[0168] However, it is easy to observe from the figure that the peak values ​​of the in-phase transmission gain and the adjacent-phase crosstalk gain are at different capacitance values, so the signal-to-noise ratio (SNR) at the receiving end is defined as:

[0169]

[0170] Among them, U a is the receiving voltage of the A-phase signal, and ω2 is the transmission angular frequency of the B-phase signal.

[0171] Then the above crosstalk condition can be expressed as:

[0172] SNR≥12dB (25)

[0173] Meeting this condition indicates that the system design effectively reduces mutual interference between adjacent phases. Derivation reveals that crosstalk is primarily related to the quality factor (Q) of the signal receiving circuits of the corresponding phases. Crosstalk is eliminated when the Q of each phase's signal receiving circuit is greater than 300.

[0174] The above analysis can be used to obtain the parameter design method of the system, in which the parameter relationship between the power transmission channel and the signal separation channel network is:

[0175]

[0176] Among them, L s 、C s L1 and C1 are the series resonant inductor and capacitor of the power transmission circuit respectively, L3 and C3 are the series resonant inductor and capacitor of the A-phase signal transmission circuit respectively, and L4 and C5 are the series resonant inductor and capacitor of the B-phase signal transmission circuit respectively.

[0177] Therefore, considering the issues of system efficiency, output power, energy-signal crosstalk, and signal transmission gain, the present invention also proposes a specific parameter design method for a three-phase wireless power and signal reverse coordinated transmission system:

[0178] Step S1: determining the transmission frequency of the serial bits, and determining the frequency values ​​of the power modulation wave and the three-way high-frequency signal modulation wave according to the transmission frequency of the serial bits;

[0179] Step S2: predetermining initial values ​​of parameters of circuit components in the signal transmission and reception loops based on the frequency values ​​of the power modulation wave, the three-way high-frequency signal modulation wave, the power channel resonance filtering condition, the power transmission efficiency, and the signal transmission gain constraint condition; wherein the power channel resonance filtering condition requires that the system resonate at a preset frequency, and the signal transmission gain constraint condition includes maximizing the gain of the in-phase signal and minimizing crosstalk between adjacent-phase signals;

[0180] Step S3: Determine the mutual inductance matrix M of the three-phase primary and secondary magnetic coupling coils according to the load power efficiency curve eq And the three-phase primary and secondary compensation capacitors C p1 、C p2 、C p3 、C s1 、C s2 、C s3 ;

[0181] Step S4: Using the initial parameter values ​​of the system design, determine whether the overall signal transmission gain meets the requirements; if not, return to step S2 and redesign; for example, determine whether the in-phase signal gain is greater than a preset value; if not, return to step S2 and redesign;

[0182] Step S5: Use the initial parameter value of the system design to determine whether the crosstalk of the power to the signal transmission is serious; if the crosstalk is serious, return to step S2 and redesign; for example, the voltage value of the power interference signal is the aforementioned U pf Is it less than the set value? If it is greater than the set value, return to step S2 and redesign;

[0183] Step S6: Using the initial parameter values ​​of the system design, determine whether the crosstalk between adjacent phases is serious; if the crosstalk is serious, return to step S2 and redesign; for example, determine whether the signal-to-noise ratio at the signal receiving end is greater than the set value; if not, return to step S2 and redesign;

[0184] Step S7: Return to step S3 to check the three-phase magnetic coupling coil M eq Whether the best power efficiency can be obtained, if not, return to step S2 for redesign.

[0185] The system parameters are designed according to the above process, specifically based on the matlab / simulink simulation platform:

[0186] Table 2 Power transmission circuit parameter design table

[0187]

[0188] Table 3 Signal transmission circuit parameter design table

[0189]

[0190]

[0191] Design a Matlab / Simulink simulation system and bring the above parameters into the simulation system to obtain the system signal demodulation process analysis diagram, the in-phase signal demodulation delay diagram, and the three-phase signal demodulation analysis diagram as shown below. Figure 12 、 Figure 13 and Figure 14 shown.

[0192] In summary, the present invention provides a three-phase wireless power and signal reverse coordinated transmission system that can accomplish the basic tasks of forward power transmission and multi-path signal reverse coordinated transmission. This system significantly improves the system's signal transmission rate, reduces cross-coupling between signal and power circuits, simplifies the system's structural design, and improves the system's power transmission quality. Furthermore, the present invention provides a system parameter design method that can be used to design a three-phase wireless power and signal reverse coordinated transmission system capable of achieving the aforementioned functions.

[0193] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0194] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course can also be implemented by hardware. Based on this understanding, the essence of the above technical solution or the part that contributes to the existing technology can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or certain parts of the embodiments.

[0195] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A three-phase wireless power and signal reverse coordinated transmission system, characterized in that: include: DC power supply, three-phase high-frequency inverter circuit, three-phase primary compensation capacitor, three-phase secondary compensation capacitor, three-phase primary magnetic coupling coil, three-phase secondary magnetic coupling coil, signal transmission channel network, signal modulation and demodulation circuit network, encoder, decoder, three-phase rectifier filter circuit, filter capacitor and load resistor; The midpoint of each phase bridge arm of the three-phase high-frequency inverter circuit is connected to the corresponding primary magnetic coupling coil via the corresponding primary compensation capacitor, and the midpoint of each phase bridge arm of the three-phase rectifier filter circuit is connected to the corresponding secondary magnetic coupling coil via the corresponding secondary compensation capacitor; The signal transmission channel network includes three signal injection networks and three signal separation transmission channel networks respectively; wherein each signal injection network includes a secondary-side signal injection transformer, a secondary-side signal injection resonant capacitor and a discharge resistor, the primary-side coil of the secondary-side signal injection transformer is connected in series with the secondary-side signal injection resonant capacitor and the discharge resistor, and the secondary-side coil of the secondary-side signal injection transformer is connected to the corresponding secondary-side magnetic coupling coil and secondary-side compensation capacitor, respectively, to form a secondary-side power transmission channel; Each signal separation transmission channel network includes a primary signal pickup transformer, an extracted signal resonant capacitor, a wave-blocking network inductor, a wave-blocking network capacitor and a sampling resistor, wherein the primary side coil of the primary signal pickup transformer is connected in parallel with the extracted signal resonant capacitor, and the coordinated wave-blocking network capacitor is respectively connected in parallel with the wave-blocking network inductor and the sampling resistor, wherein the wave-blocking network inductor and the wave-blocking network capacitor constitute a wave-blocking network for blocking low-frequency energy transmission and identifying the spectrum characteristics of the local signal, and the secondary side coil of the primary signal pickup transformer is respectively connected with the corresponding primary compensation capacitor and the primary magnetic coupling coil, and constitutes a primary power transmission channel.

2. The system according to claim 1, wherein The three-phase primary magnetic coupling coil and the three-phase secondary magnetic coupling coil are both connected in a star connection manner.

3. The system according to claim 1, wherein: The modulation waveform transmitted in the circuit topology of the system is a composite modulation wave, which includes one electric energy modulation wave and three high-frequency signal modulation waves, wherein each signal injection network is used to inject a corresponding one high-frequency signal modulation wave, and the three high-frequency signal modulation waves injected by the three signal injection networks are combined with one electric energy modulation wave to obtain the composite modulation wave; each of the signal separation transmission channel networks is used to perform signal separation on the received composite modulation wave to obtain a high-frequency signal modulation wave of the corresponding frequency.

4. The system according to claim 1, wherein: The signal modulation and demodulation circuit network includes a signal modulation circuit network and a signal demodulation circuit network; The signal modulation circuit network includes a controller and a power amplifier. The signal modulation circuit network is connected to the encoder. The encoder is used to encode the baseband signal generated by the signal generator to obtain three parallel binary sequences. The controller is used to modulate the three parallel binary sequences using a 2ASK modulation method, and input the modulated three high-frequency signal modulated waves into the power amplifier for amplification processing, and input the amplified three high-frequency signal modulated waves into the corresponding signal injection network. The signal demodulation circuit network includes three signal demodulation circuits, each signal demodulation circuit includes a bandpass filter, a multiplier, a low-pass filter, and a sampling decision device, and the signal demodulation circuit network is connected to the decoder; Among them, the voltage signal sampled on the corresponding sampling resistor is filtered by a bandpass filter, and the filtered signal is input into the multiplier to separate the high-frequency carrier component and the low-frequency baseband signal component, highlighting code element 0 and code element 1, and a low-pass filter is used to filter out the corresponding high-frequency carrier component. A sampling decision device is used to make a decision and output three parallel binary sequences. The three parallel binary sequences are sampled and processed by a decoder and then converted from parallel to serial to restore the original high-speed serial data.

5. The system according to claim 4, wherein: The system adopts frequency division multiplexing transmission technology to divide the total bandwidth used for transmission into 4 sub-bands for transmission of power and signals; The 2ASK modulation signal bandwidth of each sub-channel is twice the bandwidth of the corresponding baseband signal, and the center frequency is located at the corresponding carrier signal frequency.

6. The system according to claim 4, wherein: The frequency of each carrier wave of the system is greater than the bandwidth of the corresponding baseband signal.

7. The system according to claim 4, wherein: The carrier frequencies of each channel of the system are arranged in ascending order according to the number of channel phases, and the interval between the signal carrier frequencies between adjacent phases is greater than the sum of 2 times the baseband signal bandwidth and the protection bandwidth, wherein the protection bandwidth is the isolation band set between adjacent sub-bands.

8. The system according to claim 4, wherein: Each signal separation transmission channel network operates in an underdamped state so that the duration of the transient process at the moment of switching between the transmission code element 0 and the code element 1 is less than that of the individual code elements of the baseband signal.

9. A parameter design method for a three-phase wireless power and signal reverse coordinated transmission system, used to design a system as claimed in any one of claims 1 to 8, characterized in that: include: Determine the transmission frequency of the serial bit, and determine the frequency values ​​of the power modulation wave and the three-way high-frequency signal modulation wave according to the transmission frequency; The initial values ​​of the circuit component parameters in the signal transmission and reception circuits are predetermined based on the frequency values ​​of the power modulation wave, the three-way high-frequency signal modulation wave, the power channel resonance filtering condition, the power transmission efficiency, and the signal transmission gain constraint condition; wherein the power channel resonance filtering condition requires that the system resonate at a preset frequency, and the signal transmission gain constraint condition includes maximizing the gain of the in-phase signal and minimizing the crosstalk between adjacent-phase signals; The mutual inductance matrix of the three-phase primary and secondary magnetic coupling coils and the three-phase primary and secondary compensation capacitors are determined according to the load power and power transmission efficiency.

10. The method according to claim 9, wherein It also includes judging whether the design parameters meet the preset requirements through the following judgment conditions: A signal gain verification condition, wherein the signal gain verification condition is whether the in-phase signal gain is greater than a preset value; A crosstalk verification condition, wherein the crosstalk verification condition is whether the voltage value of the power interference signal is less than a set value; The adjacent phase crosstalk verification condition is whether the signal-to-noise ratio of the signal receiving end is greater than a set value.

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