CN111901052A - Electric energy and signal parallel wireless transmission system controlled by multi-modulation wave composite SPWM - Google Patents
Electric energy and signal parallel wireless transmission system controlled by multi-modulation wave composite SPWM Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B14/00—Transmission systems not characterised by the medium used for transmission
- H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
- H04B14/023—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse amplitude modulation
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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
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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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
- H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
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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
- H02J50/80—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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B14/00—Transmission systems not characterised by the medium used for transmission
- H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
- H04B14/026—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse time characteristics modulation, e.g. width, position, interval
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B14/00—Transmission systems not characterised by the medium used for transmission
- H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
- H04B14/04—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse code modulation
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Abstract
The invention provides an electric energy and signal parallel wireless transmission system controlled by multi-modulation wave composite SPWM. In a primary side circuit, high-speed serial bits form n paths of parallel binary sequences through an encoder and are sent to a multi-modulation wave composite SPWM control circuit for amplitude modulation, then composite pulse waves are output based on SPWM control, and composite high-frequency currents are generated in a primary side coil in a magnetic coupling coil. In the secondary side circuit, a secondary side coil and a secondary side electric energy compensation capacitor form an electric energy transmission channel, the frequency component of an electric energy modulation wave in the composite high-frequency current is separated to supply power to a load resistor, n paths of signal modulation wave components with different frequencies are separated out by a signal separation channel network, and the signal is demodulated by a signal demodulation circuit network and then sent to a decoder to recover high-speed serial bits. The invention realizes the stable parallel synchronous transmission without cross coupling interference between the electric energy and the multi-channel signals, and effectively improves the signal transmission rate while ensuring the stability of the electric energy.
Description
Technical Field
The invention provides an electric energy and signal parallel wireless transmission system controlled by multi-modulation wave composite SPWM, belonging to the technical field of wireless electric energy transmission.
Background
With the increasingly wide application of intelligent electronic products, the wireless power transmission technology is receiving more and more attention from people. In many cases, the system still needs to provide additional wireless communication capability based on power transmission, such as underwater wireless exploration, in-vivo equipment, and the like. The synchronous parallel transmission of wireless power signals is becoming an important subject to meet the future development requirements.
Wireless Power Transfer (WPT) was first introduced in the united states of the nineteenth century. The novel power access mode is a novel power access mode which realizes that electric energy is transmitted from source equipment to powered equipment by means of space intangible soft media (such as magnetic fields, electric fields, lasers, microwaves and the like). The technology realizes the electrical isolation between power supply equipment and power receiving equipment, thereby fundamentally avoiding the problems of device abrasion, poor contact, contact spark and the like caused by the traditional wired power supply mode, being a clean, safe and flexible novel power supply mode and being judged as one of ten future scientific research directions by American 'technical review' magazines. The Inductive Coupled Power Transfer (ICPT) technology generates an alternating magnetic field in a Coupled inductance coil, and realizes non-contact transmission of electric energy by using the alternating magnetic field.
The existing technology for synchronously transmitting the wireless electric energy signals utilizes a double-coil double-channel transmission technology, a shared channel transmission technology, a time division multiplexing transmission technology, a radio frequency technology, a coupling transformer and other transmission modes. However, the double-coil double-channel transmission technology has the problem of cross coupling of signals and electric energy transmission coils; the time-division multiplexing transmission technology cannot realize continuous transmission of signals and electric energy; although the radio frequency technology has a good transmission effect, the flexibility of the system is reduced due to the overlarge volume of the radio frequency technology. The coupling transformer is added, the signal carrier is added by using the zero crossing point of the inverter circuit, the carrier signal is recovered at the electric energy end, but the peak voltage interference is large at the moment of adding the carrier. The existing single-coil shared channel transmission technology generally has the problem of low transmission rate. Finding a method that is efficient, flexible, and capable of ensuring high-rate signal transmission has become a hot issue in current research.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides a multi-modulation wave composite SPWM controlled electric energy and signal parallel wireless transmission system, which can efficiently and flexibly complete the transmission task of electric energy and multi-channel signals from a primary side to a secondary side, and realizes the non-cross coupling interference, high quality and stable parallel synchronous transmission of the electric energy and the multi-channel signals.
The invention content is as follows: in order to achieve the above object, the present invention provides a multi-modulation wave composite SPWM controlled power and signal parallel wireless transmission system, which comprises: the device comprises a power supply, a primary side transmitting circuit and a secondary side receiving circuit;
the primary side transmitting circuit is a zero compensation circuit and comprises a rectifying filter circuit, a high-frequency inverter circuit, a primary side coil, a multi-modulation wave composite SPWM control circuit and an encoder; the encoder encodes high-speed serial bits to be transmitted into n-path binary sequences; the multi-modulation wave composite SPWM control circuit firstly modulates n paths of binary sequences into a frequency f1To fnN-way signal modulationWave-making, regenerated to frequency f0Finally, modulating the n paths of signal modulation waves and the electric energy modulation waves onto a carrier wave by adopting an SPWM (sinusoidal pulse width modulation) method to generate an SPWM control signal so as to control the high-frequency inverter circuit to output a composite pulse wave containing the frequency of the electric energy modulation waves and the frequency of the n paths of signal modulation waves; the composite pulse wave generates a composite high-frequency current through a primary coil;
the secondary side receiving circuit comprises a secondary side coil, a signal separation channel network, a signal demodulation circuit network, a decoder, a secondary side electric energy compensation capacitor and a load; the secondary side coil is coupled with the primary side coil to generate an induced current; the secondary side electric energy compensation capacitor and the secondary side coil form an electric energy transmission channel, and an electric energy modulation wave frequency component is separated from the induced current and used for supplying power to a load; the signal separation channel network separates each signal modulation wave frequency component from the induced current and sends the signal modulation wave frequency component to the signal demodulation circuit network, and the signal demodulation circuit network demodulates each signal modulation wave frequency component respectively; and the decoder decodes the n paths of binary sequences generated by demodulation to obtain the high-speed serial bits.
The multi-modulation wave composite SPWM control circuit comprises 1 path of electric energy modulation wave, n paths of signal modulation waves with different frequencies and 1 path of carrier wave signal, and the composite modulation wave function f of the multi-modulation wave composite SPWM control circuitr(t) is:
fr(t)＝a0sin 2πf0t+a1sin2πf1t+...+ansin2πfnt
f0modulating the wave frequency, a, for the power transmission channel0Modulating the amplitude of the wave for the electric energy transmission channel; f. of1...fnRespectively, n signal transmission channels modulating wave frequencies, a1...anThe wave amplitude is modulated for n signal transmission channels.
Several alternative embodiments are also presented below, which can be combined arbitrarily.
In one possible implementation, the multi-modulation wave composite SPWM control circuit employs FDM transmission technology to divide the total bandwidth for transmission into n +1 sub-bands to transmit n +1 modulated signals of different frequencies in the composite pulse wave, respectively.
In one possible implementation, the modulation wave amplitude value of the n signal transmission channels is given by n parallel binary sequences which are converted and output by a high-speed serial bit through an encoder. The multi-modulation wave composite SPWM control circuit modulates n paths of binary sequences to n sub-frequency bands by adopting 2ASK amplitude modulation; and the n paths of parallel binary sequence baseband signals adopt a 2ASK amplitude modulation strategy. The frequency spectrum bandwidth of each sub-channel 2ASK modulation signal is twice of the bandwidth of a baseband signal, the center frequency is the frequency of the corresponding signal modulation wave, and the integrity of the modulation signal can be ensured only if the frequency of the signal modulation wave is larger than the bandwidth of the parallel binary sequence. In order to ensure that n sub-bands are not subjected to aliasing, isolation bands are required to be arranged among the sub-bands, the frequencies of signal modulation waves are arranged in an increasing mode along with the number of signal channels, and the frequency difference of adjacent signal modulation waves is larger than the sum of the bandwidth of a parallel binary sequence which is 2 times larger than the bandwidth of the isolation bands, so that aliasing of frequency spectrums of the multi-path sub-bands is prevented.
In one possible implementation manner, the parameter relationship between the power transmission channel and the signal separation channel network is as follows:
according to crosstalk analysis, at least the quality factor of each signal separation channel is guaranteed to be larger than 300.
In one possible implementation manner, the high-frequency inverter circuit is a full-bridge inverter circuit composed of 4 switching tubes. The multi-modulation wave composite SPWM control circuit modulates n paths of signal modulation waves and electric energy modulation waves by adopting an SPWM modulation method, and specifically comprises the following steps:
the multi-modulation wave composite SPWM control circuit converts the frequency of f0The electric energy modulation wave and the frequency of f1To fnThe n-path signal amplitude modulation waves are summed and superposed, then compared with carrier waves in size, the obtained difference is generated into gate trigger pulse of the front arm of the full-bridge inverter circuit through Boolean algebra, the gate trigger pulse of the front arm of the full-bridge inverter circuit is inverted to generate gate trigger pulse of the rear arm of the full-bridge inverter circuit, so that the high-frequency inverter circuit outputsAnd generating a composite pulse wave containing the frequency of the electric energy modulation wave and the frequency of the n paths of signal modulation waves.
In a possible implementation manner, the signal splitting channel network includes n signal splitting channels, each signal splitting channel is implemented by an LRC series resonant filter circuit, and the resonant frequencies of the n signal splitting channels are respectively f1To fn。
In one possible implementation manner, the signal demodulation circuit network includes n signal demodulation circuits, and each signal demodulation circuit includes a band-pass filter, a multiplier, a low-pass filter, and a decision device, which are connected in sequence. The demodulation process of the signal is as follows:
(1) the signal separation channel network comprises n parallel RLC series resonance filter circuits. The natural resonant frequency of which is set to the frequency f of the signal modulation wave of the corresponding channel1，f2...fn. And screening out the corresponding signal modulation wave frequency of each path by utilizing the filtering characteristic of RLC series resonance to complete the separation of signals. Capacitor C1，C2...CnEach signal transmission can be compensated.
(2) At the moment of the conversion between the '0' code element and the '1' code element, the transient process duration t at the moment of the conversion can be known according to the transient differential equation of the circuitpRelated to the selection of parameters for the RLC tandem second order system. Therefore, the appropriate RLC parameters are selected to make the RLC series second-order system work in an underdamped state and make the transient process duration t of the switching moment of the '0' code element and the '1' code elementpLess than the transmission period T of the binary parallel sequencesAnd making a basis for subsequent decision sampling.
(3) The signal demodulation circuit adopts incoherent demodulation, i.e. inductance L1，L2...LnOn the collecting voltage U1，U2...UnThe frequency signals corresponding to non-local channels in the collected voltage are filtered by a band-pass filter to ensure that signal decoupling is not interfered by other frequency signals, the collected voltage is corrected by a multiplier, the signal characteristics of code elements '0' and '1' are highlighted, a waveform envelope curve is obtained by a low-pass filter, and the waveform envelope curve enters a decision device to be decided and output n paths of parallel binary systemsAnd (4) sequencing. Due to transient duration t at the instant of transition between "0" and "1" symbolspLess than the transmission period T of the binary parallel sequencesThe accuracy of the decoder sampling is not affected.
In one possible implementation manner, in order to suppress crosstalk of the electric energy modulation wave to the signal modulation wave, the signal modulation wave to the electric energy modulation wave, and the signal modulation wave to the other signal modulation wave, the quality factor Q of each signal separation channel satisfies: q is more than 300.
Has the advantages that: compared with the prior art, the invention has the following advantages:
the invention completes the basic task of synchronous transmission of electric energy and multi-path signals, greatly improves the data volume transmitted in unit time of the system, avoids the cross coupling between the signals and the electric energy loop, simplifies the structure of the system and improves the efficiency and the application flexibility of the system.
Drawings
Fig. 1 is a schematic topology diagram of an electric energy and signal parallel wireless transmission system controlled by a multi-modulation wave composite SPWM in embodiment 1;
FIG. 2 is a diagram of a circuit for demodulating the k-th signal;
FIG. 3 is a parametric design power efficiency curve for example 1;
FIG. 4 shows a transmission cycle T of parallel binary sequences in example 1s＞tpThe case of binary sequence reduction;
FIG. 5 shows a transmission cycle T of parallel binary sequences in example 1s＝tpThe case of binary sequence reduction;
FIG. 6 shows a transmission cycle T of parallel binary sequences in example 1s＜tpThe case of binary sequence reduction;
fig. 7 is a schematic diagram illustrating a comparison of signal transmission between a transmitting end and a receiving end in embodiment 1.
Detailed Description
The terminology used in the following embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be noted that the terms "upper", "lower", "left", "right", and the like used in the embodiments of the present application are described in terms of the angles shown in the drawings, and should not be construed as limiting the embodiments of the present application. In addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element via an intermediate element.
The invention aims to provide a multi-modulation wave composite SPWM controlled electric energy and signal parallel wireless transmission system which can efficiently and flexibly complete the transmission task of electric energy and multi-channel signals from a primary side to a secondary side and realize the parallel synchronous transmission without cross coupling interference, high quality and stability of the electric energy and the multi-channel signals.
The technical solution of the present invention is further explained with reference to the accompanying drawings and specific embodiments.
Example 1:
in order to better describe the multi-modulation wave composite SPWM controlled electric energy and signal parallel wireless transmission system and the control method thereof, three paths of signal transmission channels are selected to transmit electric energy and signal in parallel at the transmission rate of 50kbit/s (transmission period T)s20us) as an example analysis, the frequency f of the electrical energy modulating wave is selected in consideration of the parameter design conditions in claim 30200kHz, the signal channel 1 corresponds to the characteristic frequency f of the modulated wave1600kHz, signal path2 corresponding to characteristic frequency f of modulated wave21000kHz, the signal channel 3 corresponds to the characteristic frequency f of the modulated wave3＝1400kHz。
The method comprises the following steps: designing a system structure:
a wireless transmission system for electric energy and signal parallel controlled by multi-modulation wave composite SPWM comprises an AC power supply, a rectification filter circuit, a high-frequency inverter circuit, an encoder, a multi-modulation wave composite SPWM control circuit, a magnetic coupling coil, a signal separation channel network, a signal demodulation circuit network, a decoder, a secondary electric energy compensation capacitor CSLoad resistance RLEleven sections, as shown in fig. 1.
Wherein, the secondary coil LSSecondary side electric energy compensation capacitor CSLoad resistance RLForming a secondary electric energy transmission channel; r1，L1，C1And the signal demodulation circuit 1 forms the signal transmission channel 1 of the secondary side; r2，L2，C2And a signal demodulation circuit 2 to form a secondary side signal transmission channel 2, R3，L3，C3And the signal demodulation circuit 3 constitute a secondary side signal transmission channel 3.
The high-frequency inverter circuit comprises four full-control type devices IGBT, and the gate-level on-off of the high-frequency inverter circuit is controlled by the multi-modulation wave composite SPWM control circuit.
The multi-modulation wave composite SPWM control circuit converts the frequency of f0The electric energy modulation wave and the frequency of f1...fnThe n paths of signal amplitude modulation waves are summed and superposed and then are in communication with a triangular carrier wave fcAnd comparing the magnitude, generating two paths of IGBT gate trigger pulses by the obtained difference through Boolean algebra, and generating the other two paths of IGBT gate trigger pulses after inversion so that the high-frequency inverter circuit outputs a pulse wave which comprises the frequency of the electric energy modulation wave and the frequency of the n paths of signal modulation waves.
The magnetic coupling transmission coil is a group of magnetic coupling inductance coils and comprises a primary coil LpAnd a secondary winding LS。
The secondary electric energy transmission channel is composed of a load resistor RLSecondary winding LsElectric energy compensation capacitor CsAnd (4) forming. Secondary winding LsElectric energy compensation electricityContainer CsWith respect to frequency f of electric energy modulated wave0And (4) resonating.
The signal separation transmission channel network comprises three RLC series resonance filter circuits which are connected in parallel. The resonant frequency of which is set to the signal frequency f of the corresponding channel1，f2，f3. And screening out the characteristic frequency of the signal corresponding to each path by using the filtering characteristic of RLC series resonance to complete the separation of the signals. Capacitor C1，C2，C3Each signal transmission can be compensated. To avoid crosstalk between signal transmission to power transmission, power transmission to signal transmission, and signal transmission to signal transmission, the quality factor Q of each signal separation transmission channel needs to be greater than 300. For L on the detection inductance in the signal transmission channeli，L2，L3Voltage U of1，U2，U3And collecting, and demodulating the signal as the network input of the signal demodulation circuit.
The signal demodulation circuit performs non-coherent demodulation for network sampling, and detects inductance L as shown in FIG. 21，L2，L3The collected voltage passes through a band-pass filter to filter non-characteristic frequency signals in the collected voltage, negative axis numerical values in the collected voltage are positive through a multiplier, code element characteristics of numbers 0 and 1 are highlighted, envelope lines of waveforms are obtained through a low-pass filter, and finally a decision device is carried out to complete decoupling reduction of the code elements 0 and 1.
The signal separation transmission channel network and the signal demodulation circuit network jointly form a signal secondary side transmission channel.
The encoder adds a special code group with the length of n bits at the beginning part of the high-speed serial bit, the special code group is used as a flag bit for starting transmission, serial-parallel conversion is carried out to form a three-way parallel binary sequence, and the three-way parallel binary sequence is transmitted to a decoder for sampling and parallel-serial conversion multiplexing of the high-speed serial bit after being transmitted to a secondary side. Both can be realized by the programming of a single chip microcomputer.
Step two: solving system electric energy output power expression P based on system circuitoutAnd determining the optimal mutual inductance value M of the magnetic coupling coil:
(1) under the action of an electric energy modulation wave, according to the attached figure 1, the following components are provided:
wherein, ω is0Defined as the characteristic angular frequency of the electric energy modulation wave,
the equivalent impedance is input to the primary side of the system under the action of the frequency of the electric energy modulation wave,
the equivalent impedance of the secondary side under the action of the electric energy modulation wave,
the equivalent admittance is input to the primary side of the system under the action of the frequency of the electric energy modulation wave.
Impedance values of the signal separation transmission channel 1, the signal separation transmission channel 2 and the signal separation transmission channel 3 are respectively. Rp，LpIs the internal resistance and inductance value, R, of the primary coils，LsIs the internal resistance and inductance value, R, of the secondary windingLIs a load resistance, CsAnd compensating the capacitor for the secondary side electric energy.
(2) Primary coil current under action of electric energy modulation wave frequency
Secondary side coil current under the action of frequency of electric energy modulation wave
Can be expressed as
Wherein the content of the first and second substances,
as electric energyThe inverter outputs a square wave voltage under the action of the modulation wave frequency.
(3) Based on
The relation between the secondary side voltage and the secondary side voltage under the action of the frequency of the electric energy modulation wave is obtained
And the load output power PoutComprises the following steps:
(4) the system efficiency η may be expressed as:
when the system satisfies the condition:
the efficiency η can be expressed in simplified form as:
and selecting an optimal mutual inductance value M according to the load output power and the efficiency expression under the action of the frequency of the electric energy modulation wave. Parametric design power efficiency curves as shown in fig. 3, the optimal mutual inductance M of the magnetic coupling coil is 47 uH.
Step three: calculating a system transient process duration parameter:
according to the system characteristics, L on the inductor is detected when the signal received by each signal separation channel changes instantlynThe detected voltage is in zero state response, and the response time determines the delay of signal transmission. L isnAnd CnResonating at the corresponding natural frequency in the same size and opposite directions, and using CnTo replace uLnRepresenting its differential equation. Comprises the following steps:
wherein u iscnFor capacitors C in the signal pathnThe voltage across; u. ofsk(t) is the voltage at two ends of the signal transmission loop, Laplace transformation is carried out on the differential equation to obtain a transfer function of
The second order system transfer function is generally of the form:
when 0 < zeta < 1, the system works in an underdamped state. Defining a damped oscillation angular frequency wdIs composed of
The system transient process duration tpCan be expressed as
For the system, there are
Design parameter Rn，Ln，CnSo that it satisfies 0 < ζ < 1, i.e.
The system works in an underdamping state, if the envelope judgment value is set to be one half of the steady state value, t is required to be enabledp＜Ts. In combination with equations (11), (12) and (13), the transient duration constraint is:
the system parameters are selected to satisfy the formulas (14) and (15) at the same time. It can be seen from fig. 4 to 6 that when the parallel binary sequence is transmitted for a period Ts＞tpThe correctness of binary sequence reduction can be ensured, Ts＝tpIs a critical case, Ts＜tpA situation may arise where the binary sequence is erroneously restored.
Step four: and (3) analyzing crosstalk between electric energy and signals:
the electric energy and signal parallel wireless transmission system controlled by the multi-modulation wave composite SPWM has the advantages that as the electric energy and n paths of signals are transmitted from a primary side to a secondary side through the same magnetic circuit mechanism, crosstalk can be generated among electric energy pair signals, signal pair electric energy and signal pair signals.
From the analysis, the characteristic angular frequency w of the signal modulation wave can be obtained1Under the action of the load resistor R of the systemLVoltage across
And the voltage at two ends of the inductor is detected on a signal modulation wave channel with the number of m
Comprises the following steps:
wherein
Modulating the characteristic angular frequency w for a signal1Acting the current of the primary coil;
modulating the characteristic angular frequency w for a signal1Under the action, the equivalent impedance of the secondary side is achieved;
γs1is defined as:
wherein
1. Analyzing crosstalk of signal transmission to power transmission:
from the equations (16), (17) and (18), the electrical energy modulation wave angular frequency ω can be derived0Under the action of load resistance RLVoltage obtained at both ends
And the signal modulation wave angular frequency omega1Load resistance R under actionLVoltage obtained at both ends
Comprises the following steps:
definition of
Wherein
To avoid signal to power crosstalk, it is desirable to
Carrying out crosstalk analysis on the system according to the formula; find the quality factor Q and the load resistance R of the crosstalk and signal separation channelLAll have relations. When the load is 50 ohms, crosstalk is eliminated when each channel quality factor Q > 300.
2. Crosstalk analysis of power to signal transmission:
from the equations (16), (17) and (18), the signal separation channel with the number m can be obtained at the angular frequency w of the electrical energy modulation wave0Under the action of which it detects the voltage on the inductor
Separate from the signal transmission channel numbered m at the frequency w of the corresponding signal modulation wave1Lower it detects the voltage on the inductance
The expression is as follows:
to avoid crosstalk of electrical energy to the signal, it should be satisfied
Defining the signal-to-noise ratio SNR:
the above-mentioned power-to-signal crosstalk condition can be expressed as:
SNR≥13.98dB (26)
satisfying this condition may indicate that the system design avoids crosstalk of electrical energy to signal transmission. It is derived that the interference is mainly related to the quality factor Q of the signal separation channel. Crosstalk is eliminated when each channel quality factor Q > 300.
3. Crosstalk analysis of signal-to-signal transmission:
from the expressions (16), (17) and (18), it can be seen that the signal separation transmission channel numbered m is at the signal modulation wave frequency w1Under the action of which it detects the voltage on the inductor
At the frequency w of the signal-modulated wave in the signal-separated transmission channel numbered m2Under the action of which the detection inductor detects the interference voltage
Is expressed as
Definition of
To avoid the characteristic angular frequency w of the signal2For the characteristic angular frequency w of the signal1The crosstalk of the corresponding signal channel with the number m should satisfy
Defining the signal-to-noise ratio SNR:
the above crosstalk condition can be expressed as:
SNR≥13.98dB (31)
satisfying this condition indicates that the system design avoids the signal characteristic angular frequency w2For the characteristic angular frequency w of the signal1Crosstalk of the corresponding signal channel numbered m. It was derived that the crosstalk is mainly related to the quality factor Q of the signal separation channel numbered m. Crosstalk is eliminated when each channel quality factor Q > 300.
Combining the crosstalk and the transient process duration problem, the corresponding system parameter design process should be:
(1) selecting the frequency value of the electric energy modulation wave and the signal modulation wave according to the transmitting frequency of the serial bit;
(2) a group of circuit element parameter initial values are designed in advance according to signals, electric energy channel resonance filtering conditions, under-damping state satisfaction conditions and transient process duration limiting conditions;
(3) determining a mutual inductance value M of the magnetic coupling transmission coil according to a load power efficiency curve;
(4) judging whether crosstalk of signals to electric energy transmission exists or not by using parameter values designed by the system; if the crosstalk exists, returning to the redesign in the step (2);
(5) judging whether crosstalk of electric energy to signal transmission exists or not by using a parameter value designed by a system; if the crosstalk exists, returning to the redesign in the step (2);
(6) judging whether crosstalk of signals to signal transmission exists or not by using parameter values designed by a system; if the crosstalk exists, returning to the redesign in the step (2);
(7) returning to (3) checks whether the mutual inductance value M can obtain the best power efficiency, and returning to (2) for redesign if not.
Designing system parameters according to the process, and designing the system parameters based on a matlab/simulink simulation platform:
TABLE 1 System architecture parameters
Fig. 7 is a schematic diagram illustrating a comparison of signal transmission between a transmitting end and a receiving end in embodiment 1. Transmission rate of 50kbit/s, period TsA total of 200 serial bits are transmitted in 0.004s at 20 us. Because the initial zone bit occupies 3TsAnd 3 paths of signals are uniformly sampled and delayed by Ts for each path, so that the transmission delay is 6T in totals。
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (10)
1. Electric energy and signal parallel wireless transmission system of compound SPWM control of many modulation waves, including power, primary side transmitting circuit and vice limit receiving circuit, its characterized in that:
the primary side transmitting circuit is a zero compensation circuit and comprises a rectifying filter circuit, a high-frequency inverter circuit, a primary side coil, a multi-modulation wave composite SPWM control circuit and an encoder; the encoder encodes high-speed serial bits to be transmitted into n-path binary sequences; the multi-modulation wave composite SPWM control circuit firstly modulates n paths of binary sequences into a frequency f1To fnN signal modulation waves of (1) and regenerating the frequency f0Finally, modulating the n paths of signal modulation waves and the electric energy modulation waves onto a carrier wave by adopting an SPWM (sinusoidal pulse width modulation) method to generate an SPWM control signal so as to control the high-frequency inverter circuit to output a composite pulse wave containing the frequency of the electric energy modulation waves and the frequency of the n paths of signal modulation waves; the composite pulse wave generates a composite high-frequency current through a primary coil;
the secondary side receiving circuit comprises a secondary side coil, a signal separation channel network, a signal demodulation circuit network, a decoder, a secondary side electric energy compensation capacitor and a load; the secondary side coil is coupled with the primary side coil to generate an induced current; the secondary side electric energy compensation capacitor and the secondary side coil form an electric energy transmission channel, and an electric energy modulation wave frequency component is separated from the induced current and used for supplying power to a load; the signal separation channel network separates each signal modulation wave frequency component from the induced current and sends the signal modulation wave frequency component to the signal demodulation circuit network, and the signal demodulation circuit network demodulates each signal modulation wave frequency component respectively; and the decoder decodes the n paths of binary sequences generated by demodulation to obtain the high-speed serial bits.
2. The multi-modulated wave composite SPWM-controlled power and signal parallel wireless transmission system of claim 1, wherein: the multi-modulation wave composite SPWM control circuit adopts FDM transmission technology to divide the total bandwidth for transmission into n +1 sub-frequency bands so as to respectively transmit n +1 paths of modulated signals with different frequencies in the composite pulse wave.
3. The multi-modulated wave composite SPWM controlled power and signal parallel wireless transmission system of claim 2, wherein: the multi-modulation wave composite SPWM control circuit modulates n paths of binary sequences to n sub-frequency bands by adopting 2ASK amplitude modulation; the frequency spectrum bandwidth of each path of 2ASK modulation signal is twice the bandwidth of the binary sequence baseband signal, the center frequency of each path of 2ASK modulation signal is the frequency of the corresponding signal modulation wave, and the frequency of the signal modulation wave is greater than the bandwidth of the corresponding binary sequence baseband signal.
4. The SPWM-controlled electric energy and signal parallel wireless transmission system of claim 3 wherein an isolation strip is further disposed between adjacent sub-bands in the n +1 sub-bands, and the bandwidth of the isolation strip is Δ B, so that the frequency difference between two adjacent signal modulation waves is greater than 2(Δ B + B), and B represents the bandwidth of the binary sequence.
5. The multi-modulation wave composite SPWM-controlled electric energy and signal parallel wireless transmission system of claim 1 wherein the high-frequency inverter circuit is a full-bridge inverter circuit consisting of 4 switching tubes.
6. The electrical energy and signal parallel wireless transmission system controlled by the multi-modulation wave complex SPWM of claim 5 wherein the multi-modulation wave complex SPWM control circuit modulates n signal modulation waves and electrical energy modulation waves by SPWM modulation method, specifically:
the multi-modulation wave composite SPWM control circuit converts the frequency of f0The electric energy modulation wave and the frequency of f1To fnThe n paths of signal amplitude modulation waves are summed and superposed, then the sum is compared with the carrier wave, the calculated difference is generated into a gate trigger pulse of the front arm of the full-bridge inverter circuit through Boolean algebra, the gate trigger pulse of the front arm of the full-bridge inverter circuit is inverted, a gate trigger pulse of the rear arm of the full-bridge inverter circuit is generated, and the high-frequency inverter circuit outputs a composite pulse wave containing the frequency of the electric energy modulation wave and the frequency of the n paths of signal modulation waves.
7. The multi-modulated wave composite SPWM-controlled power and signal parallel wireless transmission system of claim 1, wherein: the signal separation channel network comprises n signal separation channels, each signal separation channel is realized by an LRC series resonance filter circuit, and the resonance frequencies of the n signal separation channels are respectively f1To fn。
8. The multi-modulated wave composite SPWM-controlled power and signal parallel wireless transmission system of claim 7, wherein: the signal demodulation circuit network demodulates the separated n paths of signals in a non-coherent demodulation mode; the signal demodulation circuit network comprises n signal demodulation circuits, each signal demodulation circuit comprises a band-pass filter, a multiplier, a low-pass filter and a decision device which are sequentially connected, the band-pass filter acquires the voltage on an inductor in the corresponding LRC series resonance filter circuit, frequency signals corresponding to non-local channels in the acquired voltage are filtered, the negative axis value in the acquired voltage is positive through the multiplier, then the low-pass filter is used for acquiring envelope curves of waveforms, and finally the decision device is carried out to complete decoupling reduction of '0' and '1' code elements.
9. The multi-modulated wave composite SPWM-controlled power and signal parallel wireless transmission system of claim 7, wherein: the encoder adds a special code group with a certain length of bits at the beginning part of the high-speed serial bits as a flag bit for starting transmission, and then converts the data into n-path parallel binary sequences, wherein the sending period of the n-path parallel binary sequences is Ts，Ts＞tp，tpThe transient process duration at the transition instant of the "0" symbol and the "1" symbol;
the decoder starts decoding after detecting the flag bit; the decoder comprises a sampling shift register and a parallel/serial converter; sampling the register with a period TsSampling is carried out, the sampling result is sent to a parallel/serial converter for parallel-serial conversion, and the n-path binary parallel sequence is restored into the original high-speed serial bit.
10. The multi-modulated wave composite SPWM-controlled power and signal parallel wireless transmission system of claim 1, wherein:
the quality factor Q of each signal separation channel satisfies: q is more than 300.
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