A Wireless Energy and Data Synchronous Transmission System and Its Parameter Design Method

Abstract

A wireless energy and data synchronous transmission system and its parameter design method relate to the technical field of wireless power transmission, and solve the technical problem of "how to improve the communication performance of the system while simplifying the circuit structure". The system includes: an energy transmission loop and a data transmission loop; the data transmission loop includes a full-duplex modem and a data transceiver connected to the full-duplex modem, and the data transceiver includes a primary data transceiver and a secondary data transceiver; the primary data transceiver includes a first capacitor, a second capacitor and a primary isolation transformer; this system fully expands the communication frequency band by using a simple circuit topology and fewer components, and matches the MSK digital modulation and demodulation technology with high spectral utilization rate and good power spectrum characteristics, which can significantly improve the communication performance of the system.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless power transmission. Background Art

[0002] The existing wireless energy and data transmission solutions mainly include the following several types:

[0003] The first type: Energy and data are transmitted through different physical channels. Two different sets of coils are set up. The energy carrier is transmitted through a pair of induction coils, and the data carrier is transmitted through another pair of induction coils. However, on the one hand, the increase in size and cost brought about by the additional coupling coils is unacceptable for applications with volume or cost limitations; on the other hand, the strong electromagnetic interference generated by the energy carrier will still be coupled to the data loop and is difficult to eliminate.

[0004] The second type: Frequency Shift Keying (FSK) is used to directly modulate the energy carrier to achieve data transmission from the power supply side to the load side, and Load Shift Keying (LSK) is used to achieve reverse data transmission. This solution has been introduced into the QI standard and has been commercially applied in consumer electronics products. This wireless energy and data synchronous transmission method shares the same set of coupling coils for energy transmission and data transmission. However, on the one hand, this wireless energy and data synchronous transmission method directly modulates the energy carrier, resulting in a large interference of data transmission on energy transmission and is not applicable to high-power occasions; on the other hand, the data transmission rate of this wireless energy and data synchronous transmission method is limited by the energy carrier frequency and is thus generally low.

[0005] The third type: Based on a multi-carrier communication solution, the energy and data carriers are wirelessly transmitted through the same set of coupling coils. When sending data, the data is first modulated onto a high-frequency carrier, amplified by power, and then coupled to the power transmission circuit. The high-frequency signal is transmitted to the receiving end through a loosely coupled transformer. The receiving end extracts the high-frequency signal through a coupling circuit, and then restores it to a binary digital signal after filtering, amplification, and demodulation. This wireless energy and data synchronous transmission method does not require additional coils, and because the frequencies of the data carrier and the energy carrier are different, the interference of data transmission on power transmission is small, and the high-frequency data carrier can also improve the data transmission rate.

[0006] In order to achieve frequency division duplexing, existing solutions all adopt very complex circuit structures to expand the communication frequency band to achieve higher gain and signal-to-noise ratio. At the same time, existing wireless energy data synchronous transmission systems based on multi-carrier communication usually use ASK or FSK modulation methods to modulate data onto high-frequency carriers. Since the ASK technology has high spectral efficiency but poor anti-interference ability, while the FSK technology has better anti-interference ability and good error code performance but low spectral efficiency, existing solutions cannot achieve a balance between anti-interference ability and spectral efficiency. In addition, since existing wireless energy data synchronous transmission systems based on multi-carrier communication generally adopt analog modulation and demodulation technologies, the circuit debugging is complex, the anti-interference ability of the system is poor, and the communication frequency band is narrow.

[0007] Therefore, how to provide a wireless energy and data synchronous transmission system and its parameter design method, which can overcome the problems of complex circuit structure and unsatisfactory communication performance, has become an urgent technical problem in this field. Summary of the Invention

[0008] To solve the technical problems of unsatisfactory data transmission communication performance and complex circuit structure in the prior art, the present invention provides a wireless energy and data synchronous transmission system and its parameter design method. The system adopts a full-digital full-duplex modem and a full-duplex data transceiver with simplified circuit. The parameter design method calculates the optimal parameter configuration applicable to the system based on the system structure and the data energy transmission situation. The system and the parameter design method can simplify the circuit of the data transmission system while improving the communication performance.

[0009] A wireless energy and data synchronous transmission system, the system includes: an energy transmission loop and a data transmission loop;

[0010] The energy transmission loop is used to transmit energy signals, and includes a power supply module, a primary compensation circuit, a tapped loose coupling transformer, a secondary compensation circuit, and a load module connected in sequence. The loose coupling transformer is used to realize the transmission of energy signals from the primary side to the secondary side;

[0011] The data transmission loop includes a full-duplex modem, and a data transceiver connected to the full-duplex modem. The data transceiver includes a primary data transceiver and a secondary data transceiver;

[0012] The full-duplex modem is used to modulate the data signal to be transmitted and demodulate the received signal;

[0013] The primary-side data transceiver includes a primary-side first capacitor, a primary-side second capacitor, and a primary-side isolation transformer. One end of the primary-side first capacitor is connected to the data transmission end of the full-duplex modem, and the other end is connected to the primary side of the primary-side isolation transformer. The primary side of the primary-side isolation transformer is simultaneously connected to the data reception end of the full-duplex modem. One end of the primary-side second capacitor is connected to the secondary side of the primary-side isolation transformer, and the other end is connected to the tap of the primary side of the loose-coupling transformer.

[0014] The secondary-side data transceiver is connected to the tap of the secondary side of the loose-coupling transformer and has the same structure as the primary-side data transceiver.

[0015] Further, the power supply module includes a DC power supply and an inverter connected in parallel. The inverter is connected to the primary side of the loose-coupling transformer through a primary-side compensation circuit.

[0016] The load module includes a rectifier, a filter, and a load connected in parallel. The rectifier is connected to the secondary side of the loose-coupling transformer through a secondary-side compensation circuit.

[0017] Further, the primary-side compensation circuit includes a primary-side parallel capacitor C f1 , a primary-side series capacitor C p , and a primary-side inductor L f1 . One end of the primary-side inductor L f1 is connected to the power supply module, and the other end is connected to one end of the primary-side parallel capacitor C f1 and one end of the primary-side series capacitor C p . The other end of the primary-side parallel capacitor C f1 and the other end of the primary-side series capacitor C p are respectively connected to the primary side of the loose-coupling transformer, and the other end of the primary-side parallel capacitor C f1 is simultaneously connected to the power supply module;

[0018] The secondary-side compensation circuit is connected to the load module and has the same structure as the primary-side compensation circuit;

[0019] The secondary-side compensation circuit includes a secondary-side parallel capacitor C f2 , a secondary-side series capacitor C s , and a secondary-side inductor L f2 . One end of the secondary-side inductor L f2 is connected to the load module, and the other end is connected to one end of the secondary-side parallel capacitor C f2 and one end of the secondary-side series capacitor C s . The other end of the secondary-side parallel capacitor C f2 and the other end of the secondary-side series capacitor C sThe other ends are respectively connected to the secondary side of the loose-coupling transformer, and a capacitor C is connected in parallel on the secondary side. f2 The other ends are simultaneously connected to the power supply module.

[0020] Further, the full-duplex modem includes a digital frequency synthesizer DDS, an analog-to-digital converter ADC, and a field programmable gate array FPGA. The field programmable gate array FPGA includes a differential encoding unit, a band-pass filtering unit, a minimum shift keying MSK demodulation unit, and a differential decoding unit.

[0021] During modulation, the transmitted data passes through the differential encoding unit and the digital frequency synthesizer DDS in sequence to obtain a modulated data signal. During demodulation, the data signal to be demodulated passes through the analog-to-digital converter ADC, the band-pass filtering unit, the minimum shift keying MSK demodulation unit, and the differential decoding unit in sequence to obtain received data.

[0022] A method for designing parameters of a wireless energy and data synchronous transmission system is applied to the above system. The method includes the following steps:

[0023] S1. Obtain energy signal parameters, loose-coupling transformer parameters, and data transmission parameters.

[0024] S2. Obtain the connection positions of the primary and secondary data transceivers and the loose-coupling transformer according to the loose-coupling transformer parameters.

[0025] S3. Calculate the primary and secondary compensation circuit parameters based on the energy signal parameters and the loose-coupling transformer parameters.

[0026] S4. Calculate the primary and secondary data transceiver parameters and the carrier center frequencies of forward and reverse data transmissions based on the data transmission parameters.

[0027] Further, step S3 includes:

[0028] Based on the self-inductance L of the primary coil of the loose-coupling transformer p and the self-inductance L of the secondary coil s and the angular frequency ω of the energy signal to be transmitted p , calculate the primary and secondary compensation circuit parameters. The primary and secondary compensation circuit parameters include the primary parallel capacitor C f1 , the primary series capacitor C p , the primary inductor L f1 , the secondary parallel capacitor C f2 , the secondary series capacitor C s , and the secondary inductor L f2 ;

[0029] Calculate the power and efficiency of energy transmission.

[0030] Optimize the primary and secondary compensation circuit parameters according to the power and / or efficiency.

[0031] Further, step S2 includes:

[0032] Input the loose coupling transformer parameters into electromagnetic simulation software to simulate the data transmission process, and obtain the primary side tap position and secondary side tap position when the equivalent coupling coefficient of the primary and secondary coils of the loose coupling transformer is the largest. The primary side tap position is the connection position between the primary data transceiver and the loose coupling transformer, and the secondary side tap position is the connection position between the secondary data transceiver and the loose coupling transformer.

[0033] Further, step S4 includes:

[0034] Generate multiple data transmission gain curves through mathematical analysis software;

[0035] Select a data transmission gain curve based on the data transmission parameters, and determine the loop impedance coefficient, loop inductance value, and loop capacitance value corresponding to the selected data transmission gain curve;

[0036] Calculate the primary data transceiver parameters, secondary data transceiver parameters, and carrier center frequencies for forward and reverse data transmission according to the loop impedance coefficient, loop inductance value, and loop capacitance value.

[0037] A parameter design device for a wireless energy and data synchronous transmission system, comprising:

[0038] A parameter acquisition module, configured to acquire energy signal parameters, loose coupling transformer parameters, and data transmission parameters;

[0039] A connection position determination module, configured to obtain the connection position between the primary data transceiver and the loose coupling transformer and the connection position between the secondary data transceiver and the loose coupling transformer according to the loose coupling transformer parameters;

[0040] A compensation circuit calculation module, configured to calculate primary and secondary compensation circuit parameters based on the energy signal parameters and loose coupling transformer parameters;

[0041] A data transceiver calculation module, configured to calculate primary data transceiver parameters, secondary data transceiver parameters, carrier center frequency for forward data transmission, and carrier center frequency for reverse data transmission based on the data transmission parameters.

[0042] An electronic device, comprising a processor and a storage device. The storage device stores multiple instructions, and the processor is configured to read the multiple instructions in the storage device and execute any one of the parameter design methods described in the present invention.

[0043] The wireless energy and data synchronous transmission system and parameter design method provided by the present invention have at least the following beneficial effects:

[0044] (1) The wireless energy data synchronous transmission system proposed in the present invention adopts a new data transceiver circuit, introduces MSK modulation and demodulation technology and FPGA-based full-digital modulation and demodulation technology, simplifies the circuit structure, reduces the number of components, and avoids complex circuit structures such as duplexers in traditional solutions. Only four capacitors and two isolation transformers are required to realize the injection and extraction of data carriers for full-duplex communication. The use of two isolation transformers can effectively protect the full-duplex modem. The system fully expands the communication frequency band using a simple circuit topology and fewer components, and is matched with MSK digital modulation and demodulation technology with high spectrum utilization and good power spectrum characteristics, which can significantly improve the communication performance of the system, with low bit error rate, large bandwidth and large data channel gain.

[0045] (2) The wireless energy data synchronous transmission system proposed in the present invention improves the coupling coefficient of the data transmission channel by optimizing the tap position of the loosely coupled transformer. Since the data transceiver and the loosely coupled transformer are connected by taps, the circuit design is also highly flexible and the four capacitance values ​​of the data transceiver can be flexibly selected according to the needs of the application to achieve different channel characteristics.

[0046] (3) The wireless energy data synchronous transmission system proposed in the present invention adopts a primary-secondary compensation circuit, which can provide the reactive power required for the operation of the primary circuit and realize the characteristics of constant current output and zero phase angle input of the system. In addition, it can also filter out the high-order harmonics introduced into the primary circuit due to the inversion of the inverter unit, reduce the interference of energy transmission on data transmission, and have a low bit error rate, so that the data signal waveform remains basically consistent whether there is energy transmission or not.

[0047] The wireless energy and data synchronous transmission system described in the present invention can be applied to the field of multi-carrier communications. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 A schematic diagram of the structure of an embodiment of a wireless energy and data synchronous transmission system provided by the present invention;

[0049] Figure 2 A structural schematic diagram of an embodiment of a full-duplex modem in a wireless energy and data synchronous transmission system provided by the present invention;

[0050] Figure 3 A circuit diagram of an embodiment of a data channel equivalent circuit in a wireless energy and data synchronous transmission system provided by the present invention;

[0051] Figure 4Schematic diagram of a data signal waveform of full-duplex communication in the wireless energy and data synchronous transmission system provided by the present invention;

[0052] Figure 5 Waveform diagram of the output of the inverter and the received data signal in the wireless energy and data synchronous transmission system provided by the present invention;

[0053] Figure 6 Simulation result diagram of an embodiment of the output transmission gain curve in the wireless energy and data synchronous transmission system provided by the present invention;

[0054] Figure 7 Schematic diagram of an embodiment of the relationship between the bandwidth evaluation coefficient and system parameters in the wireless energy and data synchronous transmission system provided by the present invention;

[0055] Figure 8 Schematic diagram of another embodiment of the relationship between the bandwidth evaluation coefficient and system parameters in the wireless energy and data synchronous transmission system provided by the present invention;

[0056] Reference numerals: 1 - power supply module, 2 - primary compensation circuit, 3 - loosely coupled transformer, 4 - secondary compensation circuit, 5 - load module, 6 - primary data transceiver, 7 - secondary data transceiver. Detailed implementation manners

[0057] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings of the specification and specific implementation manners.

[0058] See Figure 1 , in some embodiments, a wireless energy and data synchronous transmission system is provided, and the system includes: an energy transmission loop and a data transmission loop;

[0059] The energy transmission loop is used to transmit energy signals, and includes a power supply module 1, a primary compensation circuit 2, a loosely coupled transformer 3 with a tap, a secondary compensation circuit 4, and a load module 5 connected in sequence. The loosely coupled transformer is used to realize the transmission of energy signals from the primary side to the secondary side.

[0060] The energy transmission loop transfers the primary energy to the secondary side through the loosely coupled transformer 3 with a tap to supply power to the load. The inverter converts the DC input voltage into a high-frequency AC voltage. The high-frequency AC voltage is input to the rectifier through the primary compensation circuit 2, the loosely coupled transformer 3 with a tap, and the secondary compensation circuit 4 in sequence. The rectifier converts the high-frequency AC voltage into a DC voltage and inputs it to the load. The primary and secondary compensation circuits can provide the reactive power required for the operation of the primary circuit, realize the characteristics of constant current output and zero phase angle input of the system. In addition, they can also filter out the high-order harmonics introduced into the primary circuit due to the inversion of the inverter unit, and reduce the interference of energy transmission on data transmission.

[0061] The data transmission loop includes a full-duplex modem and a data transceiver connected to the full-duplex modem. The data transceiver includes a primary-side data transceiver 6 and a secondary-side data transceiver 7;

[0062] The full-duplex modem is used to modulate the data signal to be transmitted and demodulate the received signal, that is, to provide a data signal for the data transceiver or to receive the data signal provided by the data transceiver;

[0063] The primary-side data transceiver 6 includes a primary-side first capacitor C dp1 and a primary-side second capacitor C dp2 and a primary-side isolation transformer T p . One end of the primary-side first capacitor is connected to the data transmission end of the full-duplex modem, and the other end is connected to the primary side of the primary-side isolation transformer. The primary side of the primary-side isolation transformer is simultaneously connected to the data reception end of the full-duplex modem. One end of the primary-side second capacitor is connected to the secondary side of the primary-side isolation transformer, and the other end is connected to the tap of the primary side of the loose-coupling transformer. The full-duplex modem is used to provide the modulated data signal U TXp ;

[0064] The secondary-side data transceiver 7 is connected to the tap of the secondary side of the loose-coupling transformer and has the same structure as the primary-side data transceiver. Specifically, the secondary-side data transceiver includes a secondary-side first capacitor C ds1 and a secondary-side second capacitor C ds2 and a secondary-side isolation transformer T s . The full-duplex modem is used to provide the modulated data signal U TXs for the secondary-side data transceiver. One end of the secondary-side first capacitor is connected to the data transmission end of the full-duplex modem, and the other end is connected to the primary side of the secondary-side isolation transformer. One end of the secondary-side second capacitor is connected to the secondary side of the secondary-side isolation transformer, and the primary side of the secondary-side isolation transformer is simultaneously connected to the data reception end of the full-duplex modem and the other end is connected to the tap of the primary side of the loose-coupling transformer.

[0065] As a preferred embodiment, the power supply module 1 includes a DC power supply and an inverter connected in parallel. The inverter is connected to the primary side of the loose-coupling transformer 3 through a primary-side compensation circuit 2; the load module 5 includes a rectifier, a filter, and a load connected in parallel. The rectifier is connected to the secondary side of the loose-coupling transformer through a secondary-side compensation circuit 4.

[0066] Specifically, as Figure 1 shown, Uin is the DC input voltage, and the inverter includes Q 1 -Q 4 (four MOSFETs) for converting the DC input voltage into a high-frequency AC voltage. The rectifier includes four rectifier diodes D 1 -D 4 for converting the high-frequency AC voltage into a DC voltage to be input to the load.

[0067] As a preferred embodiment, the primary compensation circuit includes a primary parallel capacitor C f1 , a primary series capacitor C p and a primary inductor L f1 , one end of the primary inductor L f1 is connected to the power supply module, and the other end is connected to one end of the primary parallel capacitor C f1 and one end of the primary series capacitor C p , the other end of the primary parallel capacitor C f1 and the other end of the primary series capacitor C p are respectively connected to the primary side of the loosely coupled transformer, and the other end of the primary parallel capacitor C f1 is also connected to the power supply module at the same time;

[0068] The secondary compensation circuit includes a secondary parallel capacitor C f2 , a secondary series capacitor C s and a secondary inductor L f2 , one end of the secondary inductor L f2 is connected to the load module, and the other end is connected to one end of the secondary parallel capacitor C f2 and one end of the secondary series capacitor C s , the other end of the secondary parallel capacitor C f2 and the other end of the secondary series capacitor C s are respectively connected to the secondary side of the loosely coupled transformer, and the other end of the secondary parallel capacitor C f2 is also connected to the power supply module at the same time.

[0069] Reference Figure 2 , as a preferred embodiment, the full-duplex modem includes a digital frequency synthesizer DDS, an analog-to-digital converter ADC, and a field programmable gate array FPGA. The field programmable gate array FPGA includes a differential encoding unit, a band-pass filtering unit, a minimum shift keying MSK demodulation unit, and a differential decoding unit.

[0070] It should be noted that the existing wireless energy and data synchronous transmission systems mainly adopt ASK (Amplitude Shift Keying) technology and FSK (Frequency Shift Keying) technology for modulation and demodulation. Compared with the application of ASK, MSK technology does not use amplitude variation to transmit information, so it has good anti-noise interference ability. Moreover, MSK technology does not directly modulate the energy carrier, which is beneficial to improving the stability of energy transmission. Compared with FSK technology, as a modulation and demodulation method improved on the basis of FSK technology, MSK technology has the characteristics of a minimum modulation ratio of 0.5, small frequency deviation, and continuous phase, achieving higher spectral efficiency. In addition, since the two carriers of MSK are orthogonal, its bit error rate (BER) is lower. From the perspective of the power spectrum, the main lobe width of MSK is large, the side lobe attenuation is fast, the adjacent channel interference is small, and the anti-interference ability is strong. Therefore, for a multi-carrier communication system with limited frequency bands, MSK can significantly reduce the inter-channel interference (ICI) of the system. In addition, the continuous phase characteristic of MSK technology makes it have the characteristic of constant envelope, which is easy to apply in a non-linear channel. In short, MSK technology has the characteristics of high spectral efficiency, constant envelope, compact spectrum, good bit error rate performance, and easy implementation of demodulation and synchronization circuits, and is especially suitable for wireless energy and signal transmission systems.

[0071] At the same time, compared with analog modulation and demodulation technology, all-digital modulation and demodulation technology has the advantages of good anti-noise performance, high integration, good confidentiality performance, and high transmission quality. Therefore, the digital modulation and demodulation technology implemented by FPGA has more advantages in terms of stability, flexibility, and economy, and is conducive to the transformation to ASIC and system-level SOC.

[0072] During modulation, the data signal to be transmitted passes through a differential encoding unit and a digital frequency synthesizer DDS in sequence to obtain the modulated signal; during demodulation, the received signal to be demodulated passes through an analog-to-digital converter ADC, a band-pass filtering unit, a minimum shift keying MSK demodulation unit, and a differential decoding unit in sequence to obtain the received data signal.

[0073] It should be noted that when the modulated signal is input to the primary data transceiver, it is a forward data transmission at this time. Specifically, the modulated signal is injected into the energy signal by using the primary data transceiver to obtain a superimposed signal, and then the primary superimposed signal is transmitted from the primary circuit to the secondary circuit through the magnetic coupling mechanism in the loosely coupled transformer. The secondary data transceiver is used to extract the data signal from the superimposed signal, and then the full-duplex modem is used to demodulate the transmitted data. Correspondingly, when the modulated signal is input to the secondary data transceiver, it is a reverse data transmission at this time. Specifically, the data signal is injected into the energy signal by using the secondary data transceiver to obtain a superimposed signal, and then the secondary superimposed signal is transmitted from the secondary circuit to the primary circuit through the magnetic coupling mechanism in the loosely coupled transformer. The primary data transceiver is used to extract the received signal from the superimposed signal, and then the full-duplex modem is used to demodulate the transmitted data.

[0074] The working principle of this system is as follows: The inverter is used to convert the direct current output by the power supply into medium and high frequency alternating current, which is used as the energy carrier to be transmitted. For the forward data transmission process, the data to be transmitted is modulated into another high-frequency signal, that is, the data carrier signal, by using the minimum shift keying (MSK) method on the primary side. The data carrier signal is injected into the energy carrier signal by using the primary data transceiver to obtain the primary superimposed signal. The primary superimposed signal is transmitted from the primary circuit to the secondary circuit through the magnetic coupling mechanism. The secondary data transceiver is used to extract the data carrier signal from the superimposed signal, and then the full-duplex modem is used to demodulate the transmitted data. Similarly, the reverse data transmission can be realized. The remaining energy carrier in the forward transmission is loaded at both ends of the load after rectification and filtering of the AC component in sequence.

[0075] In some embodiments, a method for designing the parameters of a wireless energy and data synchronous transmission system is provided, which is applied to the above system. The method includes the following steps:

[0076] S1. Obtain the energy signal parameters, the loosely coupled transformer parameters, and the data transmission parameters;

[0077] S2. According to the loosely coupled transformer parameters, obtain the connection positions of the primary data transceiver and the loosely coupled transformer and the connection positions of the secondary data transceiver and the loosely coupled transformer;

[0078] S3. Based on the energy signal parameters and the loosely coupled transformer parameters, calculate the primary and secondary compensation circuit parameters;

[0079] S4. Based on the data transmission parameters, calculate the primary and secondary data transceiver parameters and the carrier center frequencies of the forward and reverse data transmissions.

[0080] Specifically, in step S1, the energy signal parameters of the wireless energy and data synchronous transmission system are determined according to the application requirements, specifically including: input voltage U in and output current I out ﹑ angular frequency ω of the energy signal to be transmitted p 、 angular frequency ω of the modulated data signal d and load resistance R L . A loosely coupled transformer is designed according to the application requirements. The parameters of the loosely coupled transformer include: self-inductance L of the primary coil p 、 self-inductance L of the secondary coil s 、 mutual inductance M of the loosely coupled transformer, primary inductance L f1 、 secondary inductance L f2 and coupling coefficient k between the primary and secondary coils, and primary inductance L f1 、 self-inductance L of the primary coil p 、 self-inductance L of the secondary coil s and secondary inductance L f2 parasitic resistances R f1 、 R p 、 R s and R f2 . Data transmission parameters are designed according to the application scenario requirements. The data transmission parameters include: data transmission gain and bandwidth.

[0081] Step S2 includes the following steps:

[0082] Input the parameters of the loosely coupled transformer into electromagnetic simulation software to simulate the data transmission process, and obtain the primary side tap position and secondary side tap position when the equivalent coupling coefficient of the primary and secondary coils of the loosely coupled transformer is the largest. The primary side tap position is the connection position between the primary data transceiver and the loosely coupled transformer, and the secondary side tap position is the connection position between the secondary data transceiver and the loosely coupled transformer.

[0083] Step S3 includes the following steps:

[0084] S31. Based on the self-inductance L of the primary coil of the loosely coupled transformer p 、 self-inductance L of the secondary coil s and angular frequency ω of the energy signal to be transmitted p , calculate the parameters of the primary and secondary compensation circuits. The parameters of the primary and secondary compensation circuits include primary parallel capacitor C f1 、 primary series capacitor C p 、 primary inductance L f1 、 secondary parallel capacitor C f2 、 secondary series capacitor C s 、 secondary inductance L f2 ;

[0085] S32, calculating the power and efficiency of energy transmission;

[0086] S33. Optimize the parameters of the primary-secondary compensation circuit according to the power and / or efficiency.

[0087] Specifically, the parameters of the primary-secondary compensation circuit are selected according to formula (1), and step S31 is expressed by the following formula:

[0088]

[0089] Among them, ω p is the angular frequency of the energy signal to be transmitted.

[0090] In step S32, the power and efficiency are expressed by the following formula:

[0091]

[0092]

[0093] Where M is the mutual inductance of the loosely coupled transformer, U AB is the inverter output fundamental voltage effective value, R E I is the equivalent resistance of the rectifier bridge, filter capacitor and load resistor before the rectifier bridge. ab is the output current of the secondary compensation circuit, I AB is the input current of the primary compensation circuit, I p is the primary current of the loosely coupled transformer, I s is the secondary current of the loosely coupled transformer, R f1 , R p , R s and R f2 They are the primary inductance L f1 , the self-inductance L of the primary coil p , the self-inductance L of the secondary coil s and the secondary inductor L f2 parasitic resistance.

[0094] Some variables involved in formula (3) are calculated by the following formula:

[0095]

[0096]

[0097]

[0098] Among them, U in is the DC input voltage, R L is the load resistance.

[0099] In step S33, the optimization principle is to maximize the power and / or efficiency.

[0100] Step S4 includes the following steps:

[0101] S41. Generate multiple data transmission gain curves through mathematical analysis software;

[0102] S42. Select a data transmission gain curve based on the data transmission parameters, and determine the loop impedance coefficient, loop inductance value, and loop capacitance value corresponding to the selected data transmission gain curve;

[0103] S43. Calculate the primary-side data transceiver parameters, secondary-side data transceiver parameters, carrier center frequency for forward data transmission, and carrier center frequency for reverse data transmission according to the loop impedance coefficient, loop inductance value, and loop capacitance value.

[0104] In step S4, the data transmission channel can be equivalent to an equivalent circuit. Taking the transmission from the primary side to the secondary side as an example, the equivalent circuit after regarding the secondary-side voltage source as a short circuit by using the superposition theorem is as Figure 3 shown.

[0105] In step S42, the data gain curve can reflect the data transmission parameters, specifically including data transmission gain and bandwidth. Starting from the required data transmission gain and bandwidth for the application, select an appropriate data transmission gain curve, and then the loop impedance coefficient m, loop inductance value L, and loop capacitance value C are determined.

[0106] The relationship between the data transmission gain and the loop impedance coefficient, loop inductance value, and loop capacitance value is expressed as;

[0107]

[0108]

[0109] where G dsp is the data transmission gain, M e is the mutual inductance of the loose-coupling transformer, M T is the mutual inductance of the isolation transformer, ω is the data carrier angular frequency, U dsp is the effective value of the received data carrier, U dp is the effective value of the transmitted data carrier, and A is the loop impedance value.

[0110] According to the above relationship, multiple data gain curves with different loop impedance coefficients m, loop inductance values L, and loop capacitance values C can be generated in the mathematical analysis software; based on the selected data transmission gain curve, the required loop impedance coefficient, loop inductance value, and loop capacitance value can be determined according to the above formula.

[0111] In step S43, the circuit parameters of the data transceiver are determined according to formulas (5) and (6). The calculation process in step S43 is expressed by the following formulas:

[0112]

[0113] C dp2 = C ds2 = mC dp1 = mC ds1 = C; (6)

[0114] Among them, L dpp is the self-inductance of the primary side of the primary-side isolation transformer, L dps is the self-inductance of the secondary side of the primary-side isolation transformer, L dss is the self-inductance of the primary side of the secondary-side isolation transformer, L dsp is the self-inductance of the secondary side of the secondary-side isolation transformer, L pe is the equivalent self-inductance of the primary side of the loosely coupled transformer, L se is the equivalent self-inductance of the secondary side of the loosely coupled transformer, C dp1 is the first capacitor on the primary side, C dp2 is the second capacitor on the primary side, C ds1 is the first capacitor on the secondary side, C ds2 is the second capacitor on the secondary side, m is the loop impedance coefficient, L is the loop inductance value, and C is the loop capacitance value.

[0115] As a preferred implementation, m is taken as 0.5.

[0116] In step S43, the carrier center frequency f 1 for forward data transmission and the carrier center frequency f 2 for reverse data transmission are calculated by the following formulas:

[0117]

[0118] After step S4, the data transmission rate S is determined according to the application requirements, and communication carrier frequencies are selected near the two center frequencies according to the frequency intervals specified by formula (8).

[0119]

[0120] In a specific application scenario, in order to verify the effectiveness of the proposed wireless energy and data synchronous transmission system, a set of 1 kW line energy signal synchronous transmission system is designed, which can achieve 1 Mbit / s full-duplex communication between the primary and secondary sides. The system circuit schematic diagram is as Figure 1 shown, and only four capacitors and two isolation transformers are used to realize data transceiver. The system parameters are gradually calculated according to the aforementioned parameter design method, and the results are shown in Table 1.

[0121] Table 1

[0122]

[0123]

[0124] Figure 4 shows the data signal waveform diagram of the full - duplex communication of the system. Among them, the primary and secondary sides simultaneously send random number sequences and receive them on the opposite side. It can be seen from the waveform diagram that the system realizes full - duplex 1Mbit / s communication, and by comparing the transmitted waveform and the received waveform, it can be known that the system has a low communication error rate.

[0125] Figure 5 shows the waveform diagram of the inverter output and the received data signal, indicating that when the transmission power of the system is 1kW, the system can communicate normally.

[0126] In summary, the wireless energy and data synchronous transmission system proposed in this embodiment can meet the expected goals. According to the given parameter design method, it can achieve full - duplex communication at a rate of 1Mbit / s in high - power scenarios, with stable communication, good anti - interference ability, low error rate, and a simple circuit structure, stable and reliable performance. It is expected to be widely applied in the fields of aerospace, navigation, consumer electronics, etc.

[0127] In a specific application scenario, Figure 6 shows the simulation result diagram of the output transmission gain curve of the system provided in this embodiment. As Figure 6 shown, first, there are two clusters of peaks in the data transmission gain, and the data transmission gains at the two clusters of peaks are approximate and high enough to meet the requirements of two - way data transmission; second, the frequencies corresponding to the two clusters of peaks and the data transmission gain are basically not affected by the coil distance, and the signal transmission system has good anti - offset ability. The data transmission channel obtained by using the wireless energy and data synchronous transmission system and parameter design method provided in this embodiment has good channel performance, and the communication bandwidth is significantly broadened.

[0128] The data transmission gain can mainly reflect its own transmission ability characteristics. In this application scenario, it is the characteristic that changes with frequency. From Figure 6 it can be known that the data transmission gain of the data transmission system provided in this embodiment can reach more than 1, while the existing data transmission systems usually only have a data transmission gain of 0 - 1. The system and method provided in this embodiment can obtain a significantly higher data transmission gain. A higher data transmission gain is beneficial to improving the signal - to - noise ratio of the system. Therefore, the data transmission system and its parameter design method provided in this embodiment can significantly improve the communication performance of the system.

[0129] In addition, the bandwidth of a channel is an important indicator for evaluating the performance of a communication system. The bandwidth of a channel reflects the channel capacity and is an important factor determining the channel transmission ability. For an analog channel, the bandwidth of the channel refers to the difference between the highest frequency and the lowest frequency that can pass through the channel. However, the analysis of channel bandwidth is relatively complex. To simplify the analysis, the bandwidth evaluation coefficient of the signal bandwidth in this system is defined as:

[0130]

[0131] That is, the frequency interval between the two center carrier frequencies proposed in Equation (7), where:

[0132]

[0133] This variable is a coefficient introduced for convenient description.

[0134] The bandwidth evaluation coefficient B can reflect the channel capacity to a certain extent, and its value is less than the actual bandwidth of the established channel. In this system, the evaluation coefficient B also reflects the interference situation between the forward channel and the reverse channel to a certain extent. Analyze the relationship between B and σ and the mutual inductance M of the loose-coupling transformer e as Figure 7 shown. The relationship between B and the loop impedance coefficient m and the mutual inductance M of the isolation transformer T is as Figure 8 shown.

[0135] See Figure 7 and Figure 8 , the bandwidth of the system is relatively large, and it is less affected by the mutual inductance M of the loose-coupling transformer e , that is, the bandwidth of the channel is not sensitive to the coupling coefficient of the loose-coupling transformer, and the data transmission of the system has good anti-coupling mechanism offset ability; the bandwidth evaluation coefficient B increases with the increase of the mutual inductance M of the isolation transformer T , and decreases with the increase of the impedance coefficient m. Appropriately increasing the mutual inductance M of the isolation transformer T and reducing the loop impedance coefficient m can obtain a more ideal channel bandwidth. From Figure 7 , Figure 8 it can be seen that in this application scenario, the bandwidth of the transmission system is about 3 MHz. From this, it can be known that the bandwidth of this transmission system is relatively large, can be maintained above 1 MHz, and the bandwidth of this transmission system is less affected by the coupling mechanism offset.

[0136] In some embodiments, a device for designing parameters of a wireless energy and data synchronous transmission system is provided, including:

[0137] A parameter acquisition module, configured to acquire energy signal parameters, loose-coupling transformer parameters, and data transmission parameters;

[0138] A connection position determination module, configured to obtain the connection position between the primary data transceiver and the loose-coupling transformer and the connection position between the secondary data transceiver and the loose-coupling transformer according to the parameters of the loose-coupling transformer;

[0139] A compensation circuit calculation module, configured to calculate the primary and secondary compensation circuit parameters based on the energy signal parameters and the parameters of the loose-coupling transformer;

[0140] A data transceiver calculation module, configured to calculate the primary data transceiver parameters, the secondary data transceiver parameters, the carrier center frequency for forward data transmission, and the carrier center frequency for reverse data transmission based on the data transmission parameters.

[0141] In some embodiments, in the compensation circuit calculation module:

[0142] Based on the self-inductance L of the primary coil of the loose-coupling transformer p and the self-inductance L of the secondary coil s as well as the angular frequency ω of the energy signal to be transmitted p , calculate the primary and secondary compensation circuit parameters, where the primary and secondary compensation circuit parameters include the primary parallel capacitor C f1 , the primary series capacitor C p , the primary inductor L f1 , the secondary parallel capacitor C f2 , the secondary series capacitor C s , and the secondary inductor L f2 ;

[0143] Calculate the power and efficiency of energy transmission;

[0144] Optimize the primary and secondary compensation circuit parameters according to the power and / or efficiency.

[0145] In some embodiments, the connection position determination module is further configured to:

[0146] Input the parameters of the loose-coupling transformer into electromagnetic simulation software to simulate the data transmission process, and obtain the primary side tap position and the secondary side tap position when the equivalent coupling coefficient of the primary and secondary coils of the loose-coupling transformer is the largest. The primary side tap position is the connection position between the primary data transceiver and the loose-coupling transformer, and the secondary side tap position is the connection position between the secondary data transceiver and the loose-coupling transformer.

[0147] In some embodiments, the data transceiver calculation module is further configured to:

[0148] Generate multiple data transmission gain curves corresponding to different loop impedance coefficients, loop inductance values, and loop capacitance values through mathematical analysis software;

[0149] Selecting a data transmission gain curve based on the data transmission parameter, and calculating a loop impedance coefficient, a loop inductance value, and a loop capacitance value corresponding to the data transmission gain curve;

[0150] According to the loop impedance coefficient, the loop inductance value and the loop capacitance value, the primary side data transceiver parameters, the secondary side data transceiver parameters and the carrier center frequency of the forward and reverse data transmission are calculated.

[0151] In some embodiments, an electronic device is provided, including a processor and a storage device, wherein the storage device stores a plurality of instructions, and the processor is used to read the plurality of instructions in the storage device and execute the above method.

[0152] The wireless energy data synchronous transmission system provided in this embodiment adopts a new data transceiver circuit, introduces MSK modulation and demodulation technology and FPGA-based full-digital modulation and demodulation technology, simplifies the circuit structure, reduces the number of components, avoids complex circuit structures such as duplexers in traditional solutions, and only requires four capacitors and two isolation transformers to realize the injection and extraction of data carriers for full-duplex communication. The use of two isolation transformers can effectively protect the full-duplex modem. The system fully expands the communication frequency band using a simple circuit topology and fewer components, and is matched with MSK digital modulation and demodulation technology with high spectrum utilization and good power spectrum characteristics, which can significantly improve the communication performance of the system, with low bit error rate, large bandwidth and large data channel gain; this embodiment The wireless energy data synchronous transmission system provided in the embodiment improves the coupling coefficient of the data transmission channel by optimizing the tap position of the loosely coupled transformer. Since the data transceiver is connected to the loosely coupled transformer by a tap, the circuit design is also highly flexible, and the four capacitance values ​​of the data transceiver can be flexibly selected according to the needs of the application to achieve different channel characteristics; the wireless energy data synchronous transmission system provided in this embodiment adopts a primary-secondary compensation circuit, which can provide the reactive power required for the operation of the primary circuit, and realize the characteristics of constant current output and zero phase angle input of the system. In addition, it can also filter out high-order harmonics introduced into the primary circuit due to the inversion of the inverter unit, reduce the interference of energy transmission on data transmission, and have a low bit error rate, so that the data signal waveform remains basically consistent with or without energy transmission.

[0153] Although the preferred embodiments of the present invention have been described, additional changes and modifications can be made to these embodiments by those skilled in the art once they learn of the basic inventive concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications that fall within the scope of the present invention. Obviously, those skilled in the art can make various changes and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A wireless energy and data synchronous transmission system, characterized in that, the system includes: an energy transmission loop and a data transmission loop; the energy transmission loop is used to transmit energy signals, and includes a power supply module, a primary compensation circuit, a tapped loose coupling transformer, a secondary compensation circuit, and a load module connected in sequence. The loose coupling transformer is used to realize the transmission of energy signals from the primary side to the secondary side; the data transmission loop includes a full-duplex modem, and a data transceiver connected to the full-duplex modem. The data transceiver includes a primary data transceiver and a secondary data transceiver; the full-duplex modem is used to modulate the data signal to be sent and demodulate the received signal; the primary data transceiver includes a primary first capacitor, a primary second capacitor, and a primary isolation transformer. One end of the primary first capacitor is connected to the data sending end of the full-duplex modem, and the other end is connected to the primary side of the primary isolation transformer. The primary side of the primary isolation transformer is simultaneously connected to the data receiving end of the full-duplex modem. One end of the primary second capacitor is connected to the secondary side of the primary isolation transformer, and the other end is connected to the tap of the primary side of the loose coupling transformer; the secondary data transceiver is connected to the tap of the secondary side of the loose coupling transformer and has the same structure as the primary data transceiver; The primary side compensation circuit includes a primary side parallel capacitor C f1 , a primary side series capacitor C p , and a primary side inductor L f1 . One end of the primary side inductor L f1 is connected to the power supply module, and the other end is connected to one end of the primary side parallel capacitor C f1 and one end of the primary side series capacitor C p . The other end of the primary side parallel capacitor C f1 and the other end of the primary side series capacitor C p are respectively connected to the primary side of the loosely coupled transformer, and the other end of the primary side parallel capacitor C f1 is also connected to the power supply module; the secondary compensation circuit is connected to the load module and has the same structure as the primary compensation circuit; the full-duplex modem includes a digital frequency synthesizer DDS, an analog-to-digital converter ADC, and a field programmable gate array FPGA. The field programmable gate array FPGA includes a differential encoding unit, a band-pass filtering unit, a minimum shift keying MSK demodulation unit, and a differential decoding unit; During modulation, the data to be sent passes through the differential encoding unit and the digital frequency synthesizer DDS in sequence to obtain the modulated data signal; during demodulation, the data signal to be demodulated passes through the analog-to-digital converter ADC, the band-pass filtering unit, the minimum shift keying MSK demodulation unit, and the differential decoding unit in sequence to obtain the received data.

2. The system according to claim 1, characterized in that, the power supply module includes a DC power supply and an inverter connected in parallel. The inverter is connected to the primary side of the loose coupling transformer through the primary compensation circuit; the load module includes a rectifier, a filter, and a load connected in parallel. The rectifier is connected to the secondary side of the loose coupling transformer through the secondary compensation circuit.

3. A method for designing parameters of a wireless energy and data synchronous transmission system, applied to the system according to any one of claims 1-2, characterized in that, the method includes the following steps: S1. Obtain energy signal parameters, loose coupling transformer parameters, and data transmission parameters; S2. According to the loose coupling transformer parameters, obtain the connection positions of the primary and secondary data transceivers and the loose coupling transformer; S3. Based on the energy signal parameters and the loose coupling transformer parameters, calculate the primary and secondary compensation circuit parameters; S4. Calculate the parameters of the primary and secondary data transceivers and the carrier center frequencies of forward and reverse data transmission based on the data transmission parameters.

4. The method according to claim 3, wherein, step S3 includes: Based on the self-inductance L of the primary coil of the loosely coupled transformer p , the self-inductance L of the secondary coil s and the angular frequency ω of the energy signal to be transmitted p , calculate the parameters of the primary and secondary compensation circuits. The parameters of the primary and secondary compensation circuits include the primary parallel capacitor C f1 , the primary series capacitor C p , the primary inductor L f1 , the secondary parallel capacitor C f2 , the secondary series capacitor C s , the secondary inductor L f2 ; Calculating the power and efficiency of energy transmission; Optimizing the parameters of the primary and secondary compensation circuits according to the power and / or efficiency.

5. The method according to claim 3, wherein, step S2 includes: Inputting the loose coupling transformer parameters into electromagnetic simulation software to simulate the data transmission process, and obtaining the primary side tap position and secondary side tap position when the equivalent coupling coefficient of the primary and secondary coils of the loose coupling transformer is the largest. The primary side tap position is the connection position between the primary data transceiver and the loose coupling transformer, and the secondary side tap position is the connection position between the secondary data transceiver and the loose coupling transformer.

6. The method according to claim 3, wherein, step S4 includes: Generating multiple data transmission gain curves through mathematical analysis software; Selecting a data transmission gain curve based on the data transmission parameters, and determining the loop impedance coefficient, loop inductance value, and loop capacitance value corresponding to the selected data transmission gain curve; Calculating the parameters of the primary and secondary data transceivers and the carrier center frequencies of forward and reverse data transmission according to the loop impedance coefficient, loop inductance value, and loop capacitance value.

7. A wireless energy and data synchronous transmission system parameter design device for implementing the wireless energy and data synchronous transmission system parameter design method according to any one of claims 3-6, wherein, comprising: a parameter acquisition module for acquiring energy signal parameters, loose coupling transformer parameters, and data transmission parameters; a connection position determination module for obtaining the connection positions of the primary and secondary data transceivers and the loose coupling transformer according to the loose coupling transformer parameters; a compensation circuit calculation module for calculating the parameters of the primary and secondary compensation circuits based on the energy signal parameters and the loose coupling transformer parameters; a parameter calculation module for calculating the parameters of the primary and secondary data transceivers and the carrier center frequencies of forward and reverse data transmission based on the data transmission parameters.

8. An electronic device, comprising a processor and a storage device, wherein, the storage device stores multiple instructions, and the processor is configured to read the multiple instructions in the storage device and execute the method according to any one of claims 3-6.

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