CN116231878A - Wireless energy and data synchronous transmission system and parameter design method thereof - Google Patents

Wireless energy and data synchronous transmission system and parameter design method thereof Download PDF

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Publication number
CN116231878A
CN116231878A CN202310116677.0A CN202310116677A CN116231878A CN 116231878 A CN116231878 A CN 116231878A CN 202310116677 A CN202310116677 A CN 202310116677A CN 116231878 A CN116231878 A CN 116231878A
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data
primary
primary side
parameters
secondary side
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王懿杰
李陶
孙智超
麦建伟
徐殿国
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Harbin Institute of Technology
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Harbin Institute of Technology
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/12—Modulator circuits; Transmitter circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/14—Demodulator circuits; Receiver circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Transmitters (AREA)

Abstract

A wireless energy and data synchronous transmission system and a parameter design method thereof relate to the technical field of wireless power transmission, and solve the technical problem of simplifying a circuit structure while improving the communication performance of the system, wherein the system comprises: an energy transmission circuit and a data transmission circuit; the data transmission loop comprises a full duplex modem and a data transceiver connected with the full duplex modem, wherein the data transceiver comprises a primary side data transceiver and a secondary side data transceiver; the primary data transceiver comprises a first capacitor, a second capacitor and a primary isolation transformer; the system fully expands the communication frequency band by using simple circuit topology and fewer components, and can remarkably improve the communication performance of the system by matching with the MSK digital modulation-demodulation technology with high frequency spectrum utilization rate and good power spectrum characteristic.

Description

Wireless energy and data synchronous transmission system and parameter design method thereof
Technical Field
The invention relates to the technical field of wireless power transmission.
Background
The existing wireless energy and data transmission schemes mainly comprise the following steps:
First kind: energy and data are transmitted over different physical channels. Two different sets of coils are arranged, the energy carrier wave is transmitted through one pair of induction coils, and the data carrier wave is transmitted through the other pair of induction coils. However, on the one hand, the increase in size and cost associated with the added coupling coil is not acceptable for applications with volume or cost constraints; on the other hand, the strong electromagnetic interference generated by the energy carrier is still coupled to the data loop and is difficult to cancel.
Second kind: the energy carrier is directly modulated by Frequency Shift Keying (FSK) to achieve data transmission from the power supply side to the load side, and reverse data transmission is achieved by load modulation keying (LSK). This approach is introduced to the QI standard and is commercially used in consumer electronics. The wireless energy and data synchronous transmission mode shares the same group of coupling coils with the data transmission. However, on one hand, the wireless energy and data synchronous transmission mode directly modulates the energy carrier wave, so that the data transmission has large interference on the energy transmission, and is not suitable for high-power occasions; on the other hand, the data transmission rate of the wireless energy and data synchronous transmission mode is limited by the energy carrier frequency, so that the data transmission rate is generally low.
Third kind: based on a multi-carrier communication scheme, energy and data carriers are wirelessly transmitted through the same set of coupling coils. When transmitting data, the data is modulated onto a high-frequency carrier wave, amplified by power and coupled to a power transmission circuit. The high-frequency signal is transmitted to the receiving end through the loose coupling transformer, and the receiving end extracts the high-frequency signal through the coupling circuit, and then the high-frequency signal is restored into a binary digital signal after filtering, amplifying and demodulating. The wireless energy and data synchronous transmission mode does not need to add an additional coil, and because the frequencies of the data carrier wave and the energy carrier wave are different, the interference of the data transmission on the power transmission is small, and the high-frequency data carrier wave can also improve the data transmission rate.
In order to realize frequency division duplex, the existing schemes all use very complex circuit structures to expand the communication frequency band so as to realize higher gain and signal to noise ratio. Meanwhile, the existing wireless energy data synchronous transmission system based on multi-carrier communication generally adopts an ASK or FSK modulation mode to modulate data on a high-frequency carrier, and the existing scheme cannot balance the anti-interference capability and the spectrum efficiency because the ASK technology has high spectrum efficiency but poor anti-interference capability, and the FSK technology has better anti-interference capability, good error code performance but low spectrum efficiency. In addition, the existing wireless energy data synchronous transmission system based on multi-carrier communication generally adopts an analog modulation and demodulation technology, so that the circuit is complicated to debug, the anti-interference capability of the system is poor, and the communication frequency band is narrow.
Therefore, how to provide a wireless energy and data synchronous transmission system and a parameter design method thereof, so that the problems of complex circuit structure and non-ideal communication performance can be overcome, and the wireless energy and data synchronous transmission system and the parameter design method thereof become technical problems to be solved in the field.
Disclosure of Invention
In order to solve the technical problems of non-ideal data transmission communication performance and complex circuit structure in the prior art, the invention provides a wireless energy and data synchronous transmission system and a parameter design method thereof.
A wireless energy and data synchronous transmission system, the system comprising: an energy transmission circuit and a data transmission circuit;
the energy transmission loop is used for transmitting energy signals and comprises a power supply module, a primary side compensation circuit, a loose coupling transformer with a tap, a secondary side compensation circuit and a load module which are connected in sequence, wherein the loose coupling transformer is used for transmitting the energy signals from the primary side to the secondary side;
The data transmission loop comprises a full duplex modem and a data transceiver connected with the full duplex modem, wherein the data transceiver comprises a primary side data transceiver and a secondary side data transceiver;
the full duplex modem is used for modulating a data signal to be transmitted and demodulating a received signal;
the primary side data transceiver comprises 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 with a data transmitting end of the full-duplex modem, the other end of the primary side first capacitor is connected with a primary side of the primary side isolation transformer, the primary side of the primary side isolation transformer is simultaneously connected with a data receiving end of the full-duplex modem, one end of the primary side second capacitor is connected with a secondary side of the primary side isolation transformer, and the other end of the primary side second capacitor is connected with a primary side tap of the loose coupling transformer;
the secondary side data transceiver is connected with the secondary side tap of the loose coupling transformer and has the same structure as the primary side data transceiver.
Further, the power supply module comprises a direct current power supply and an inverter which are connected in parallel, and the inverter is connected with the primary side of the loosely-coupled transformer through a primary side compensation circuit;
The load module comprises a rectifier, a filter and a load which are connected in parallel, and the rectifier is connected with the secondary side of the loose coupling transformer through a secondary side compensation circuit.
Further, the primary side compensation circuit comprises a primary side parallel capacitor C f1 Primary side series capacitor C p Primary inductance L f1 The primary side inductance L f1 One end is provided withIs connected with the power supply module, and the other end is connected with the primary side parallel capacitor C f1 One end of (2) and primary side series capacitor C p Is connected with one end of the primary side parallel capacitor C f1 Is connected with the capacitor C in series at the other end and the primary side of the capacitor C p The other end of the capacitor C is connected with the primary side of the loosely coupled transformer respectively and the primary side is connected with the capacitor C in parallel f1 The other end of the power supply module is connected with the power supply module at the same time;
the secondary side compensation circuit is connected with the load module and has the same structure as the primary side compensation circuit;
the secondary side compensation circuit comprises a secondary side parallel capacitor C f2 Series capacitor C of secondary side s Secondary inductance L f2 The secondary side inductance L f2 One end of the capacitor is connected with the load module, and the other end of the capacitor is connected with the secondary side in parallel with the capacitor C f2 One end of (a) and the secondary side are connected with a capacitor C in series s Is connected with one end of the secondary side parallel capacitor C f2 The other end and the secondary side of the capacitor are connected in series with a capacitor C s The other end of the capacitor C is connected with the secondary side of the loosely coupled transformer respectively and the secondary side is connected with the capacitor C in parallel f2 The other end of the power supply module is connected with the power supply module at the same time.
Further, the full duplex modem comprises a digital frequency synthesizer DDS, an analog-to-digital converter ADC and a field programmable gate array FPGA, wherein the field programmable gate array FPGA comprises a differential encoding unit, a band-pass filtering unit, a minimum frequency shift keying MSK demodulation unit and a differential decoding unit;
during modulation, transmitting data sequentially passes through a differential coding unit and a digital frequency synthesizer DDS to obtain a modulated data signal; during demodulation, a data signal to be demodulated sequentially passes through an analog-digital converter ADC, a band-pass filtering unit, a minimum shift keying MSK demodulation unit and a differential decoding unit to obtain received data.
A parameter design method for a wireless energy and data synchronous transmission system is applied to the system, and comprises the following steps:
s1, acquiring energy signal parameters, loose coupling transformer parameters and data transmission parameters;
s2, obtaining connection positions of the primary and secondary side data transceivers and the loose coupling transformer according to the parameters of the loose coupling transformer;
S3, calculating parameters of a primary side compensation circuit based on the energy signal parameters and the parameters of the loosely coupled transformer;
and S4, calculating parameters of the primary and secondary side data transceiver and carrier center frequency of forward and reverse data transmission based on the data transmission parameters.
Further, step S3 includes:
self-inductance L based on primary coil of loose coupling transformer p Self-inductance L of secondary coil s Angular frequency omega of energy signal to be transmitted p Calculating the primary and secondary side compensation circuit parameters, wherein the primary and secondary side compensation circuit parameters comprise primary side parallel capacitors C f1 Primary side series capacitor C p Primary inductance L f1 Parallel capacitor C with secondary side f2 Series capacitor C of secondary side s Secondary inductance L f2 ；
Calculating the power and efficiency of energy transmission;
and optimizing the primary and secondary side compensation circuit parameters according to the power and/or the efficiency.
Further, step S2 includes:
and inputting parameters of the loose coupling transformer into electromagnetic simulation software to simulate a data transmission process, and acquiring a primary side tap position and a secondary side tap position of the loose coupling transformer when the equivalent coupling coefficient of a primary and secondary side coil of the loose coupling transformer is maximum, wherein the primary side tap position is a connection position of the primary side data transceiver and the loose coupling transformer, and the secondary side tap position is a connection position of the secondary side data transceiver and the loose coupling transformer.
Further, step S4 includes:
generating a plurality of data transmission gain curves through mathematical analysis software;
selecting a data transmission gain curve based on the data transmission parameters, and determining a loop impedance coefficient, a loop inductance value and a loop capacitance value corresponding to the selected data transmission gain curve;
and calculating to obtain primary side data transceiver parameters, secondary side data transceiver parameters and carrier center frequency of forward and reverse data transmission according to the loop impedance coefficient, the loop inductance value and the loop capacitance value.
A wireless energy and data synchronous transmission system parameter design device, comprising:
the parameter acquisition module is used for acquiring energy signal parameters, loose coupling transformer parameters and data transmission parameters;
the connection position determining module is used for obtaining the connection position of the primary side data transceiver and the loose coupling transformer and the connection position of the secondary side data transceiver and the loose coupling transformer according to the parameters of the loose coupling transformer;
the compensation circuit calculation module is used for calculating primary and secondary side compensation circuit parameters based on the energy signal parameters and the loose coupling transformer parameters;
and the data transceiver calculating module is used for calculating the primary side data transceiver parameters, the secondary side data transceiver parameters, the carrier center frequency of forward data transmission and the carrier center frequency of reverse data transmission based on the data transmission parameters.
An electronic device comprises a processor and a storage device, wherein a plurality of instructions are stored in the storage device, and the processor is used for reading the plurality of instructions in the storage device and executing any parameter design method.
The wireless energy and data synchronous transmission system and the parameter design method thereof provided by the invention at least comprise the following beneficial effects:
(1) The wireless energy data synchronous transmission system provided by the invention adopts a novel data transceiver circuit, introduces an MSK modulation and demodulation technology and an FPGA-based all-digital modulation and demodulation technology, simplifies a circuit structure, reduces the number of components, avoids complex circuit structures such as a duplexer and the like in the traditional scheme, can realize the injection and extraction of data carriers of full duplex communication by only four capacitors and two isolation transformers, can effectively protect the full duplex modem by adopting the two isolation transformers, fully expands a communication frequency band by utilizing a simple circuit topology and fewer components, and is matched with the MSK digital modulation and demodulation technology with high frequency spectrum utilization rate and good power spectrum characteristics, so that the communication performance of the system can be remarkably improved, the error rate is low, the bandwidth is large and the gain of a data channel is large.
(2) The wireless energy data synchronous transmission system improves the coupling coefficient of the data transmission channel by optimizing the tap position of the loose coupling transformer, has higher flexibility in circuit design because the data transceiver and the loose coupling transformer are connected by the tap, and can flexibly select four capacitance values of the data transceiver according to application requirements to realize different channel characteristics.
(3) The wireless energy data synchronous transmission system provided by the invention adopts the primary side compensation circuit, can provide reactive power required by the operation of the primary side circuit, realizes the characteristics of constant current output and zero phase angle input of the system, and can filter out higher harmonics introduced into the primary side circuit due to inversion of the inversion unit, so that the interference of energy transmission on data transmission is reduced, the error rate is low, and the waveform of a data signal is basically consistent when the energy transmission exists or not.
The wireless energy and data synchronous transmission system can be applied to the field of multi-carrier communication.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a wireless energy and data synchronous transmission system according to the present invention;
fig. 2 is a schematic structural diagram of an embodiment of a full duplex modem in a wireless energy and data synchronous transmission system according to the present invention;
FIG. 3 is a circuit diagram of an embodiment of an equivalent circuit of a data channel in a wireless energy and data synchronous transmission system according to the present invention;
FIG. 4 is a schematic diagram of one embodiment of waveforms of data signals for full duplex communication of a wireless energy and data synchronous transmission system according to the present invention;
FIG. 5 is a waveform diagram of an embodiment of an inverter output and received data signal in a wireless energy and data synchronous transmission system according to the present invention;
FIG. 6 is a diagram of simulation results of an embodiment of an output transmission gain curve in a wireless energy and data synchronous transmission system according to the present invention;
FIG. 7 is a schematic diagram of an embodiment of a relationship between bandwidth evaluation coefficients and system parameters in a wireless energy and data synchronous transmission system according to the present invention;
FIG. 8 is a schematic diagram of another embodiment of the relationship between bandwidth evaluation coefficients and system parameters in a wireless energy and data synchronous transmission system according to the present invention;
reference numerals: the power supply system comprises a 1-power supply module, a 2-primary side compensation circuit, a 3-loosely coupled transformer, a 4-secondary side compensation circuit, a 5-load module, a 6-primary side data transceiver and a 7-secondary side data transceiver.
Detailed Description
In order to better understand the above technical solutions, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, in some embodiments, a wireless energy and data synchronous transmission system is provided, the system comprising: an energy transmission circuit and a data transmission circuit;
the energy transmission loop is used for transmitting energy signals and comprises a power supply module 1, a primary side compensation circuit 2, a loose coupling transformer 3 with taps, a secondary side compensation circuit 4 and a load module 5 which are connected in sequence, wherein the loose coupling transformer is used for transmitting the energy signals from the primary side to the secondary side.
The energy transmission loop transmits primary side energy to the secondary side through a tapped loose coupling transformer 3 to supply power to the load. The inverter converts the direct-current input voltage into high-frequency alternating-current voltage, the high-frequency alternating-current voltage is sequentially input to the rectifier through the primary side compensation circuit 2, the loose coupling transformer 3 with taps and the secondary side compensation circuit 4, and the rectifier converts the high-frequency alternating-current voltage into direct-current voltage and inputs the direct-current voltage to the load. The primary side compensation circuit can provide reactive power required by the operation of the primary side circuit, realizes the characteristics of constant current output and zero phase angle input of the system, and can filter out higher harmonics introduced into the primary side circuit due to inversion of the inversion unit, thereby reducing the interference of energy transmission on data transmission.
The data transmission loop comprises a full duplex modem and a data transceiver connected with the full duplex modem, wherein the data transceiver comprises a primary side data transceiver 6 and a secondary side data transceiver 7;
the full duplex modem is used for modulating a data signal to be transmitted, demodulating a received signal, namely, providing a data signal for the data transceiver or receiving the data signal provided by the data transceiver;
the primary data transceiver 6 comprises a primary first capacitor C dp1 Primary side second capacitor C dp2 Primary side isolation transformer T p One end of the primary side first capacitor is connected with the data transmitting end of the full duplex modem, the other end is connected with the primary side of the primary side isolation transformer, the primary side of the primary side isolation transformer is simultaneously connected with the data receiving end of the full duplex modem, one end of the primary side second capacitor is connected with the secondary side of the primary side isolation transformer, the other end is connected with the primary side tap of the loose coupling transformer, and the full duplex modem is used for providing a modulated data signal U for the primary side data transceiver TXp ；
The secondary side data transceiver 7 is connected with the secondary side tap of the loose coupling transformer and has the same structure as the primary side data transceiver. Specifically, the secondary data transceiver includes a secondary first capacitor C ds1 And a secondary side second capacitor C ds2 Secondary side isolation transformer T s The full duplex modem is used for providing the modulated data signal U for the secondary side data transceiver TXs One end of the secondary side first capacitor is connected with the data transmitting end of the full duplex modem, the other end of the secondary side first capacitor is connected with the primary side of the secondary side isolation transformer, one end of the secondary side second capacitor is connected with the secondary side of the secondary side isolation transformer, and the primary side of the secondary side isolation transformer is connected with the primary side of the secondary side isolation transformerThe side is connected with the data receiving end of the full duplex modem at the same time, and the other end is connected with a primary side tap of the loose coupling transformer.
As a preferred embodiment, the power supply module 1 comprises a dc power supply and an inverter connected in parallel, the inverter being connected to the primary side of the loosely coupled transformer 3 by a primary compensation circuit 2; the load module 5 comprises a rectifier, a filter and a load connected in parallel, the rectifier being connected to the secondary side of the loosely coupled transformer by a secondary side compensation circuit 4.
Specifically, as shown in FIG. 1, U in For DC input voltage, the inverter includes Q 1 -Q 4 (four MOSFETs) for converting a direct-current input voltage into a high-frequency alternating-current voltage. The rectifier comprises four rectifying diodes D 1 -D 4 For converting the high frequency ac voltage into dc voltage for input to a load.
As a preferred embodiment, the primary side compensation circuit comprises a primary side parallel capacitor C f1 Primary side series capacitor C p Primary inductance L f1 The primary side inductance L f1 One end of the capacitor is connected with the power supply module, and the other end of the capacitor is connected with the primary side in parallel with the capacitor C f1 One end of (2) and primary side series capacitor C p Is connected with one end of the primary side parallel capacitor C f1 Is connected with the capacitor C in series at the other end and the primary side of the capacitor C p The other end of the capacitor C is connected with the primary side of the loosely coupled transformer respectively and the primary side is connected with the capacitor C in parallel f1 The other end of the power supply module is connected with the power supply module at the same time;
the secondary side compensation circuit comprises a secondary side parallel capacitor C f2 Series capacitor C of secondary side s Secondary inductance L f2 The secondary side inductance L f2 One end of the capacitor is connected with the load module, and the other end of the capacitor is connected with the secondary side in parallel with the capacitor C f2 One end of (a) and the secondary side are connected with a capacitor C in series s Is connected with one end of the secondary side parallel capacitor C f2 The other end and the secondary side of the capacitor are connected in series with a capacitor C s The other end of the capacitor C is connected with the secondary side of the loosely coupled transformer respectively and the secondary side is connected with the capacitor C in parallel f2 Is another of (1)One end is simultaneously connected with the power supply module.
Referring to fig. 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 including a differential encoding unit, a band-pass filtering unit, a minimum shift keying MSK demodulating unit, and a differential decoding unit.
It should be noted that, the existing wireless energy and data synchronous transmission system mainly adopts ASK (Amplitude Shift Keying) technology and FSK (Frequency Shift Keying) technology to perform modulation and demodulation technology. Compared with ASK, the MSK technology does not use amplitude variation to transfer information, so that the anti-noise interference capability is good, and the MSK technology does not directly modulate the energy carrier wave, thereby being beneficial to improving the stability of energy transmission. Compared with the FSK technology, the MSK technology has the characteristics of 0.5 minimum modulation ratio, small frequency deviation and continuous phase, and realizes higher frequency spectrum efficiency as a modulation and demodulation mode improved on the basis of the FSK technology. In addition, since the two MSK carriers are orthogonal, the Bit Error Rate (BER) is lower. From the perspective of power spectrum, the main lobe of MSK is large in width, the side lobe of MSK is fast in attenuation, the adjacent channel interference is small, and the anti-interference capability is strong, so that for a multi-carrier communication system with limited frequency band, MSK can remarkably reduce the inter-channel interference (Inter Channel Interference, ICI) of the system. In addition, the characteristic of MSK technology phase continuity makes it have the characteristic of envelope constancy, easily to be applied in nonlinear channel. In a word, MSK technology has the characteristics of high spectrum efficiency, constant envelope, compact spectrum, good error rate performance and easy realization of demodulation and synchronization circuits, and is especially suitable for wireless energy and signal transmission systems.
Meanwhile, compared with the analog modulation and demodulation technology, the full-digital modulation and demodulation technology has the advantages of good noise resistance, high integration level, good confidentiality and high transmission quality. Thus, digital modem technology implemented using FPGAs is more advantageous in terms of stability, flexibility, and economy, and facilitates conversion to ASICs and system-level SOCs.
When modulating, the data signal to be transmitted sequentially passes through a differential coding unit and a digital frequency synthesizer DDS to obtain a modulated signal; during demodulation, a received signal to be demodulated sequentially 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 to obtain a received data signal.
The modulated signal is transmitted in the forward direction when it is input to the primary data transceiver. Specifically, the modulated signal is injected into the energy signal by using the primary side data transceiver to obtain a superimposed signal, the primary side superimposed signal is transferred from the primary side circuit to the secondary side circuit by using the magnetic coupling mechanism in the loose coupling transformer, the data signal in the superimposed signal is extracted by using the secondary side data transceiver, and then the data is demodulated by using the full duplex modem. Accordingly, when the modulated signal is input to the secondary data transceiver, the data is transmitted in reverse. Specifically, a secondary side data transceiver is utilized to inject a data signal into an energy signal to obtain a superimposed signal, then a secondary side superimposed signal is transferred from a secondary side circuit to a primary side circuit through a magnetic coupling mechanism in a loose coupling transformer, a receiving signal in the superimposed signal is extracted by the primary side data transceiver, and then a full duplex modem is utilized to demodulate and transmit data.
The working principle of the system is as follows: the direct current output by the power supply is converted into medium-high frequency alternating current by the inverter, and the medium-high frequency alternating current is used as an energy carrier to be transmitted. For the forward data transmission process, the data to be transmitted is modulated on the primary side by means of Minimum Shift Keying (MSK) into another high frequency signal, namely a data carrier signal. And injecting the data carrier signal into the energy carrier signal by using the primary data transceiver to obtain a primary superimposed signal. The primary side superimposed signal is transferred from the primary side circuit to the secondary side circuit by a magnetic coupling mechanism. The data carrier signal in the superimposed signal is extracted by the secondary data transceiver and then the transmitted data is demodulated by the full duplex modem. Similarly, reverse data transmission may be achieved. The rest energy carrier wave is loaded at two ends of the load after being rectified and filtered by alternating current components in sequence.
In some embodiments, a method for designing parameters of a wireless energy and data synchronous transmission system is provided, and the method is applied to the system, and comprises the following steps:
s1, acquiring energy signal parameters, loose coupling transformer parameters and data transmission parameters;
s2, obtaining the connection position of the primary side data transceiver and the loose coupling transformer and the connection position of the secondary side data transceiver and the loose coupling transformer according to the parameters of the loose coupling transformer;
S3, calculating parameters of a primary side compensation circuit based on the energy signal parameters and the parameters of the loosely coupled transformer;
and S4, calculating parameters of the primary and secondary side data transceiver and carrier center frequency of forward and reverse data transmission based on the data transmission parameters.
Specifically, in step S1, the determining, according to the application requirement, the energy signal parameter of the wireless energy and data synchronous transmission system specifically includes: input voltage U in And output current I out Angular frequency omega of energy signal to be transmitted p Angular frequency omega of modulated data signal d Load resistor R L . Designing a loose coupling transformer according to application requirements, wherein parameters of the loose coupling transformer comprise: primary coil self-inductance L p Self-inductance L of secondary coil s Mutual inductance M and primary inductance L of loose coupling transformer f1 Secondary inductance L f2 And the coupling coefficient k between the primary and secondary coils, and the primary inductance L f1 Self-inductance L of primary coil p Self-inductance L of secondary coil s And secondary inductance L f2 Parasitic resistance R of (2) f1 、R p 、R s And R is f2 . Designing data transmission parameters according to application scene requirements, wherein the data transmission parameters comprise: data transmission gain and bandwidth.
Step S2 includes the steps of:
and inputting parameters of the loose coupling transformer into electromagnetic simulation software to simulate a data transmission process, and acquiring a primary side tap position and a secondary side tap position of the loose coupling transformer when the equivalent coupling coefficient of a primary and secondary side coil of the loose coupling transformer is maximum, wherein the primary side tap position is a connection position of the primary side data transceiver and the loose coupling transformer, and the secondary side tap position is a connection position of the secondary side data transceiver and the loose coupling transformer.
Step S3 includes the steps of:
s31, self-inductance L based on primary coil of loose coupling transformer p Self-inductance L of secondary coil s Angular frequency omega of energy signal to be transmitted p Calculating the primary and secondary side compensation circuit parameters, wherein the primary and secondary side compensation circuit parameters comprise primary side parallel capacitors C f1 Primary side series capacitor C p Primary inductance L f1 Parallel capacitor C with secondary side f2 Series capacitor C of secondary side s Secondary inductance L f2 ；
S32, calculating the power and efficiency of energy transmission;
and S33, optimizing the primary and secondary side compensation circuit parameters according to the power and/or the efficiency.
Specifically, the parameters of the primary-secondary side compensation circuit are selected according to the formula (1), and the step S31 is represented by the following formula:
Figure BDA0004078807250000101
wherein omega p Is the angular frequency of the energy signal to be transmitted.
In step S32, the power and efficiency are expressed by the following formula:
Figure BDA0004078807250000102
Figure BDA0004078807250000103
wherein M is the mutual inductance of a loose coupling transformer, U AB For the inverter to output the effective value of the fundamental wave voltage, R E For conversion of rectifier bridge, filter capacitor and load resistance to the front of rectifier bridgeEquivalent resistance, I ab For the secondary compensation circuit to output current, I AB Input current for primary side compensation circuit, I p To loosely couple primary side current of transformer, I s For loosely coupling secondary side current of transformer, R f1 、R p 、R s And R is f2 Respectively the primary side inductance L f1 Self-inductance L of primary coil p Self-inductance L of secondary coil s And secondary inductance L f2 Is a parasitic resistance of (c).
The partial variables involved in equation (3) are calculated by the following equation:
Figure BDA0004078807250000111
Figure BDA0004078807250000112
Figure BDA0004078807250000113
wherein U is in R is the direct current input voltage L Is the load resistance.
In step S33, the optimization principle is to maximize power and/or efficiency.
Step S4 includes the steps of:
s41, generating a plurality of data transmission gain curves through mathematical analysis software;
s42, selecting a data transmission gain curve based on the data transmission parameters, and determining a loop impedance coefficient, a loop inductance value and a loop capacitance value corresponding to the selected data transmission gain curve;
s43, calculating to obtain primary side data transceiver parameters, secondary side data transceiver parameters, carrier center frequency of forward data transmission and carrier center frequency of reverse data transmission according to the loop impedance coefficient, the loop inductance value and the loop capacitance value.
In step S4, the data transmission channel may be equivalently an equivalent circuit, and the equivalent circuit after the secondary side voltage source is regarded as a short circuit by applying the superposition theorem is shown in fig. 3, taking primary side to secondary side transmission as an example.
In step S42, the data gain curve may reflect the data transmission parameters, specifically including the data transmission gain and bandwidth. Starting from the data transmission gain and bandwidth required for the application, a suitable data transmission gain curve is selected, which determines the loop impedance coefficient m, the loop inductance value L and the loop capacitance value C.
The relation between the data transmission gain and the loop impedance coefficient, the loop inductance value and the loop capacitance value is expressed as follows;
Figure BDA0004078807250000121
Figure BDA0004078807250000122
wherein G is dsp Data transmission gain, M e For loosely coupling transformer mutual inductance M T To isolate the mutual inductance of the transformer, ω is the angular frequency of the data carrier, U dsp For receiving data carrier effective value, U dp For transmitting the data carrier effective value, a is the loop impedance value.
According to the relation, generating a plurality of data gain curves with different loop impedance coefficients m, loop inductance values L and loop capacitance values C in mathematical analysis software; based on the selected data transmission gain curve, the desired loop impedance coefficient, loop inductance value, and loop capacitance value may be determined according to the above formulas.
In step S43, the data transceiver circuit parameters are determined according to formulas (5) (6), and the calculation process in step S43 is expressed by the following formulas:
Figure BDA0004078807250000123
C dp2 ＝C ds2 ＝mC dp1 ＝mC ds1 ＝C； (6)
wherein L is dpp For primary side self-inductance of primary side isolation transformer, L dps For the secondary side self-inductance of the primary side isolation transformer, L dss For secondary side isolation transformer primary side self-inductance, L dsp For secondary side self-inductance of secondary side isolation transformer, L pe Is the equivalent self inductance of the primary side of the loosely coupled transformer, L se Is equivalent self inductance of the secondary side of the loosely coupled transformer, C dp1 C is the primary side first capacitance dp2 C is the primary side second capacitance ds1 For the secondary side first capacitance, C ds2 The secondary side second capacitor is m is loop impedance coefficient, L is loop inductance value, and C is loop capacitance value.
As a preferred embodiment, m is 0.5.
In step S43, the carrier center frequency f of the forward data transmission 1 Carrier center frequency f of reverse data transmission 2 Calculated by the following formula:
Figure BDA0004078807250000131
after step S4, according to the data transmission rate S determined by the application, the communication carrier frequencies are selected around the two center frequencies according to the frequency interval specified by the formula (8), respectively.
Figure BDA0004078807250000132
In a specific application scene, in order to verify the effectiveness of the wireless energy and data synchronous transmission system, a set of 1kW line energy signal synchronous transmission system is designed, and 1Mbit/s full duplex communication between primary and secondary sides can be realized. The schematic diagram of the system circuit is shown in fig. 1, and data transmission and reception are realized by adopting only four capacitors and two isolation transformers. The system parameters were calculated step by step according to the parameter design method described above, and the results are shown in table 1.
TABLE 1
Figure BDA0004078807250000133
Figure BDA0004078807250000141
Fig. 4 shows a waveform diagram of a data signal for full duplex communication in a system in which primary and secondary sides simultaneously transmit a random sequence and receive on opposite sides. As can be seen from the waveform diagrams, the system realizes full duplex 1Mbit/s communication, and the error rate of the system communication is low as can be seen by comparing the generated waveform and the received waveform.
Fig. 5 shows waveforms of the output and the received data signals of the inverter, which illustrates that the system can normally communicate when the transmission power of the system is 1 kW.
In summary, the wireless energy and data synchronous transmission system provided by the embodiment can meet the expected target, and according to the given parameter design method, full duplex communication with the rate of 1Mbit/s can be realized in a higher power occasion, so that the wireless energy and data synchronous transmission system has the advantages of stable communication, good anti-interference capability, low error rate, simple circuit structure, stable and reliable performance and the like, and is expected to be widely applied to the fields of aerospace, navigation, consumer electronics and the like.
In a specific application scenario, fig. 6 shows a simulation result diagram of an output transmission gain curve of the system provided in this embodiment. As shown in fig. 6, first, there are two clusters of peaks in the data transmission gain, and the data transmission gain at the two clusters of peaks is approximate and high enough to meet the requirement of bidirectional data transmission; and secondly, the frequency and the data transmission gain corresponding to the two clusters of peaks are not basically influenced by the coil distance, and the signal transmission system has good anti-offset capability. The data transmission channel obtained by the wireless energy and data synchronous transmission system and the parameter design method provided by the embodiment has good channel performance, and the communication bandwidth is remarkably widened.
The data transmission gain may mainly represent its own transmission capability characteristics, which in the present application scenario are frequency dependent characteristics. As can be seen from fig. 6, the data transmission gain of the data transmission system provided in the present embodiment can reach more than 1, but the existing data transmission system generally only has a data transmission gain of 0-1, and the system and method provided in the present embodiment can obtain significantly higher data transmission gain. The higher data transmission gain is beneficial to improving the signal to noise ratio of the system, so the data transmission system and the parameter design method thereof provided by the embodiment can obviously improve the communication performance of the system.
In addition, the bandwidth of a channel is an important index for evaluating the performance of a communication system, reflects the capacity of the channel, and is an important factor for determining the transmission capability of the channel. For analog channels, the bandwidth of a channel refers to the difference between the highest frequency and the lowest frequency that can pass through the channel. However, analysis of the channel bandwidth is relatively complex. To simplify the analysis, the bandwidth evaluation coefficients of the signal bandwidths in the present system are defined as:
Figure BDA0004078807250000151
i.e. the frequency separation of the two center carrier frequencies as proposed in equation (7), wherein:
Figure BDA0004078807250000152
this variable is a coefficient introduced for ease of description.
The bandwidth evaluation coefficient B can reflect the capacity size of the channel to some extent, and its value is smaller than the actual bandwidth of the established channel. In the system, the evaluation coefficient B also reflects the interference situation between the forward channel and the reverse channel to a certain extent. Analysis of B and sigma and loose coupling transformer mutual inductance M e As shown in FIG. 7, B is related to the loop impedance coefficient M and the isolation transformer mutual inductance M T The relationship of (2) is shown in FIG. 8.
Referring to fig. 7 and 8, the bandwidth of the system is large and is subject to the mutual inductance M of the loose coupler transformer e The influence is small, namely the bandwidth of the channel is insensitive to the coupling coefficient of the loose coupling transformer, and the data transmission of the system has good anti-coupling mechanism biasAbility to move; bandwidth evaluation coefficient B is along with mutual inductance M of isolation transformer T Increases with increasing impedance coefficient M and decreases with increasing impedance coefficient M, and the mutual inductance M of the isolation transformer is suitably increased T Reducing the loop impedance coefficient m may result in a more desirable channel bandwidth. As can be seen from fig. 7 and 8, in this application scenario, the bandwidth of the transmission system is about 3MHz, so that it is clear that the bandwidth of the transmission system is large and can be kept above 1MHz, and the bandwidth of the transmission system is less affected by the offset of the coupling mechanism.
In some embodiments, a wireless energy and data synchronous transmission system parameter design device is provided, including:
the parameter acquisition module is used for acquiring energy signal parameters, loose coupling transformer parameters and data transmission parameters;
the connection position determining module is used for obtaining the connection position of the primary side data transceiver and the loose coupling transformer and the connection position of the secondary side data transceiver and the loose coupling transformer according to the parameters of the loose coupling transformer;
the compensation circuit calculation module is used for calculating primary and secondary side compensation circuit parameters based on the energy signal parameters and the loose coupling transformer parameters;
and the data transceiver calculating module is used for calculating the primary side data transceiver parameters, the secondary side data transceiver parameters, the carrier center frequency of forward data transmission and the carrier center frequency of reverse data transmission based on the data transmission parameters.
In some embodiments, the compensation circuit calculates the module:
self-inductance L based on primary coil of loose coupling transformer p Self-inductance L of secondary coil s Angular frequency omega of energy signal to be transmitted p Calculating the primary and secondary side compensation circuit parameters, wherein the primary and secondary side compensation circuit parameters comprise primary side parallel capacitors C f1 Primary side series capacitor C p Primary inductance L f1 Parallel capacitor C with secondary side f2 Series capacitor C of secondary side s Secondary inductance L f2 ；
Calculating the power and efficiency of energy transmission;
and optimizing the primary and secondary side compensation circuit parameters according to the power and/or the efficiency.
In some embodiments, the connection location determination module is further to:
and inputting parameters of the loose coupling transformer into electromagnetic simulation software to simulate a data transmission process, and acquiring a primary side tap position and a secondary side tap position of the loose coupling transformer when the equivalent coupling coefficient of a primary and secondary side coil of the loose coupling transformer is maximum, wherein the primary side tap position is a connection position of the primary side data transceiver and the loose coupling transformer, and the secondary side tap position is a connection position of the secondary side data transceiver and the loose coupling transformer.
In some embodiments, the data transceiver computing module is further to:
generating a plurality of data transmission gain curves corresponding to different loop impedance coefficients, loop inductance values and loop capacitance values through mathematical analysis software;
selecting a data transmission gain curve based on the data transmission parameters, and calculating a loop impedance coefficient, a loop inductance value and a loop capacitance value corresponding to the data transmission gain curve;
And calculating to obtain primary side data transceiver parameters, secondary side data transceiver parameters and carrier center frequency of forward and reverse data transmission according to the loop impedance coefficient, the loop inductance value and the loop capacitance value.
In some embodiments, an electronic device is provided that includes a processor and a storage device having a plurality of instructions stored therein, the processor configured to read the plurality of instructions in the storage device and perform the method described above.
The wireless energy data synchronous transmission system provided by the embodiment adopts a novel data transceiver circuit, introduces an MSK modulation and demodulation technology and an FPGA-based all-digital modulation and demodulation technology, simplifies a circuit structure, reduces the number of components, avoids complex circuit structures such as a duplexer and the like in the traditional scheme, can realize the injection and extraction of data carriers of full duplex communication by only four capacitors and two isolation transformers, and can effectively protect the full duplex modem by adopting the two isolation transformers; the wireless energy data synchronous transmission system provided by the embodiment improves the coupling coefficient of the data transmission channel by optimizing the tap position of the loose coupling transformer, and has higher flexibility in circuit design because the data transceiver and the loose coupling transformer are connected by adopting taps, and four capacitance values of the data transceiver can be flexibly selected according to application requirements to realize different channel characteristics; the wireless energy data synchronous transmission system provided by the embodiment adopts the primary side compensation circuit, can provide reactive power required by the working of the primary side circuit, realizes the characteristics of constant current output and zero phase angle input of the system, and can filter out higher harmonics introduced into the primary side circuit due to inversion of the inversion unit, so that the interference of energy transmission on data transmission is reduced, the error rate is low, and the waveform of a data signal is basically consistent when the energy transmission exists or not.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention. It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (10)

1. A wireless energy and data synchronous transmission system, the system comprising: an energy transmission circuit and a data transmission circuit;
the energy transmission loop is used for transmitting energy signals and comprises a power supply module, a primary side compensation circuit, a loose coupling transformer with a tap, a secondary side compensation circuit and a load module which are connected in sequence, wherein the loose coupling transformer is used for transmitting the energy signals from the primary side to the secondary side;
the data transmission loop comprises a full duplex modem and a data transceiver connected with the full duplex modem, wherein the data transceiver comprises a primary side data transceiver and a secondary side data transceiver;
The full duplex modem is used for modulating a data signal to be transmitted and demodulating a received signal;
the primary side data transceiver comprises 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 with a data transmitting end of the full-duplex modem, the other end of the primary side first capacitor is connected with a primary side of the primary side isolation transformer, the primary side of the primary side isolation transformer is simultaneously connected with a data receiving end of the full-duplex modem, one end of the primary side second capacitor is connected with a secondary side of the primary side isolation transformer, and the other end of the primary side second capacitor is connected with a primary side tap of the loose coupling transformer;
the secondary side data transceiver is connected with the secondary side tap of the loose coupling transformer and has the same structure as the primary side data transceiver.
2. The system of claim 1, wherein the power module comprises a dc power supply and an inverter connected in parallel, the inverter connected to a primary side of the loosely coupled transformer by a primary side compensation circuit;
the load module comprises a rectifier, a filter and a load which are connected in parallel, and the rectifier is connected with the secondary side of the loose coupling transformer through a secondary side compensation circuit.
3. The system of claim 1 wherein the primary compensation circuit comprises a primary shunt capacitance C f1 Primary side series capacitor C p Primary inductance L f1 The primary side inductance L f1 One end of the capacitor is connected with the power supply module, and the other end of the capacitor is connected with the primary side in parallel with the capacitor C f1 One end of (2) and primary side series capacitor C p Is connected with one end of the primary side parallel capacitor C f1 Is connected with the capacitor C in series at the other end and the primary side of the capacitor C p The other end of the capacitor C is connected with the primary side of the loosely coupled transformer respectively and the primary side is connected with the capacitor C in parallel f1 The other end of the power supply module is connected with the power supply module at the same time;
the secondary side compensation circuit is connected with the load module and has the same structure as the primary side compensation circuit.
4. The system of claim 1, wherein the full duplex modem comprises a digital frequency synthesizer DDS, an analog-to-digital converter ADC, and a field programmable gate array FPGA comprising a differential encoding unit, a bandpass filtering unit, a minimum shift keying MSK demodulation unit, and a differential decoding unit;
during modulation, transmitting data sequentially passes through a differential coding unit and a digital frequency synthesizer DDS to obtain a modulated data signal; during demodulation, a data signal to be demodulated sequentially passes through an analog-digital converter ADC, a band-pass filtering unit, a minimum shift keying MSK demodulation unit and a differential decoding unit to obtain received data.
5. A method for designing parameters of a wireless energy and data synchronous transmission system, which is applied to the system as claimed in claims 1-4, and is characterized in that the method comprises the following steps:
s1, acquiring energy signal parameters, loose coupling transformer parameters and data transmission parameters;
s2, obtaining the connection position of the primary and secondary side data transceiver and the loose coupling transformer according to the parameters of the loose coupling transformer;
s3, calculating parameters of a primary side compensation circuit based on the energy signal parameters and the parameters of the loosely coupled transformer;
and S4, calculating parameters of the primary and secondary side data transceiver and carrier center frequency of forward and reverse data transmission based on the data transmission parameters.
6. The method according to claim 5, wherein step S3 comprises:
self-inductance L based on primary coil of loose coupling transformer p Self-inductance L of secondary coil s Angular frequency omega of energy signal to be transmitted p Calculating the primary and secondary side compensation circuit parameters, wherein the primary and secondary side compensation circuit parameters comprise primary side parallel capacitors C f1 Primary side series capacitor C p Primary inductance L f1 Parallel capacitor C with secondary side f2 Series capacitor C of secondary side s Secondary inductance L f2 ；
Calculating the power and efficiency of energy transmission;
And optimizing the primary and secondary side compensation circuit parameters according to the power and/or the efficiency.
7. The method according to claim 5, wherein step S2 comprises:
and inputting parameters of the loose coupling transformer into electromagnetic simulation software to simulate a data transmission process, and acquiring a primary side tap position and a secondary side tap position of the loose coupling transformer when the equivalent coupling coefficient of a primary and secondary side coil of the loose coupling transformer is maximum, wherein the primary side tap position is a connection position of the primary side data transceiver and the loose coupling transformer, and the secondary side tap position is a connection position of the secondary side data transceiver and the loose coupling transformer.
8. The method of claim 5, wherein step S4 comprises:
generating a plurality of data transmission gain curves through mathematical analysis software;
selecting a data transmission gain curve based on the data transmission parameters, and determining a loop impedance coefficient, a loop inductance value and a loop capacitance value corresponding to the selected data transmission gain curve;
and calculating parameters of the primary and secondary side data transceiver and carrier center frequency of forward and reverse data transmission according to the loop impedance coefficient, the loop inductance value and the loop capacitance value.
9. A wireless energy and data synchronous transmission system parameter design device, comprising:
the parameter acquisition module is used for acquiring energy signal parameters, loose coupling transformer parameters and data transmission parameters;
the connection position determining module is used for obtaining the connection position of the primary and secondary side data transceiver and the loose coupling transformer according to the parameters of the loose coupling transformer;
the compensation circuit calculation module is used for calculating primary and secondary side compensation circuit parameters based on the energy signal parameters and the loose coupling transformer parameters;
and the parameter calculation module is used for calculating the parameters of the primary and secondary side data transceiver and the carrier center frequency of forward and reverse data transmission based on the data transmission parameters.
10. An electronic device comprising a processor and a memory means, wherein a plurality of instructions are stored in the memory means, the processor being configured to read the plurality of instructions in the memory means and to perform the method of claims 5-8.
CN202310116677.0A 2023-02-15 2023-02-15 Wireless energy and data synchronous transmission system and parameter design method thereof Pending CN116231878A (en)

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