CN114915317A - Fractional order phase modulation communication system for LCC wireless power transmission system - Google Patents
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- H—ELECTRICITY
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- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
- H04B5/79—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for data transfer in combination with power transfer
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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
- H02J50/80—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
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/40—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by components specially adapted for near-field transmission
- H04B5/48—Transceivers
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Abstract
The invention provides a fractional order phase communication system for an LCC wireless power transmission system, which has the advantages of simple structure, strong adaptability, good expandability, high precision, low cost and strong stability. The system comprises a full-bridge inverter (1), an LCC resonant network transmitting end (2), an LCC resonant network receiving end (3), a signal pickup circuit (4), a fractional order phase shift modulation module (5), a demodulation module (6) and a passive rectification and output end (7) for converting the received alternating voltage into direct voltage and outputting the direct voltage; in the invention, while wireless electric energy transmission is carried out, signals are modulated into odd harmonics by a fractional order phase modulation method and are simultaneously transmitted to the other side together with fundamental wave energy. The invention can be applied to the fields of power electronics and communication engineering.
Description
Technical Field
The invention relates to the field of power electronics and communication engineering, in particular to a fractional order phase communication system for an LCC wireless power transmission system.
Background
In order to meet the control requirement, the wireless power transmission system generally needs a receiving end and a transmitting end to communicate with each other to transmit parameters such as an operating state and a control target value required by a control strategy. The general practice of such wireless power transmission systems is as follows:
(1) the wireless power transmission system completes wireless communication (such as wireless communication protocols like WIFI communication and Bluetooth) through an additional communication module;
(2) signals are transmitted in parallel through two channels, one channel transmits fundamental waves to transmit electric energy, and the other channel transmits harmonic waves to transmit information;
(3) there are some special control strategies for wireless power transfer systems that do not even require the use of wireless communication, but only control by the current changes fed back by the coils.
However, the above approaches have some difficulties, which are respectively as follows.
(1) The way of accomplishing wireless communication by means of an additional communication module has the following disadvantages: the wireless power transmission system is not suitable for working in severe environment and is not beneficial to being applied to scenes such as unmanned chemical plants; the delay is longer and is not suitable for satisfying finer control strategies.
(2) The parallel transmission of signals over two channels has the following disadvantages: there is a serious electromagnetic interference problem and a more demanding EMC design is required; the cost is greatly increased by adding one more channel; affecting the power output of the system.
(3) The control strategy that does not require the use of wireless communication has the following disadvantages: no more versatile control strategy can be applied; the system has poor stability and is difficult to control.
According to the fourier transform principle, the square wave output by the inverter of the wireless power transmission system contains fundamental wave and a large amount of harmonic components:
generally, in a wireless power transmission system, a fundamental component is used to transfer energy, and a harmonic component is filtered by a resonant network.
According to the principle, the square wave output by the LCC wireless power transmission system also contains a large amount of abundant harmonic waves, and the harmonic waves are sinusoidal components like the fundamental wave, and the harmonic waves are available energy sources. In view of the idea of harmonic extraction and utilization in the power system, the invention provides a mechanism and a mode of a synchronous transmission technology of electric energy and signals.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a fractional order phase communication system for an LCC wireless power transmission system, which has the advantages of simple structure, strong adaptability, good expandability, high precision, low cost and strong stability.
The invention discloses a technical scheme adopted by a fractional order phase modulation communication system for an LCC wireless electric energy transmission system, which comprises the following steps: the invention comprises
A full-bridge inverter for converting the DC voltage into an AC voltage in a three-level state by means of a phase-shifted full-bridge;
the LCC resonant network transmitting end is used for improving the performance of square waves output by the full-bridge inverter, adjusting the proportion of output fundamental waves and residual components of the full-bridge inverter, controlling the output gain of the full-bridge inverter and the proportion of reactive power and active power and transmitting wireless energy;
the LCC resonant network transmitting end is used for transmitting the square wave to the LCC resonant network receiving end;
the signal pickup circuit is used for picking up odd harmonic signals in the wireless energy received by the LCC resonant network receiving end and sorting the odd harmonic signals in advance;
the fractional order phase shift modulation module is used for modulating a single sideband of an input signal in a fractional order phase shift mode, synthesizing and recording information to be carried into a PWM (pulse-width modulation) driving signal, inputting the PWM driving signal into the full-bridge inverter and generating alternating voltage with the information by the full-bridge inverter;
the demodulation module is used for demodulating odd harmonic signals of different frequencies of the complex channels output by the signal pickup circuit respectively based on a coherent demodulation mode; and
and the passive rectification and output end is used for converting the received alternating voltage into direct voltage and outputting the direct voltage.
Further, the fractional order PI of the fractional order phase shift modulation module γ The operation is realized by the Grunwald-letnikov definition, which is:
where γ in formula 1 is the order of fractional order, h represents the step size, j represents the number of terms of the counting element, t represents time, t represents 0 Which represents the time of the phase shift,
is the sign of runwald-letnikov fractional calculus.
Further, the fractional order PI γ The specific operation steps are as follows:
when the selected step h is sufficiently small, the limiting operation in equation 1 is approximately neglected, where the fractional derivative and integral under the definition of Grunwald-letnikov is directly calculated from equation 2 below:
in formula 2,. omega j Is a coefficient of a binomial form, h denotes a step size, j denotes the number of terms of the counting element, t denotes time, t denotes 0 Which represents the time of the phase shift,
is the sign of runwald-letnikov fractional calculus, with the following recurrence relation:
when a single sinusoidal component is calculated, a phase shift is generated, the phase shift is used for phase shift modulation, the phase of the phase shift is controlled by the order gamma of fractional order, and the fractional order phase shift is realized according to the relation between the average voltage and the phase angle of the full-bridge inverter.
Still further, the specific process of frequency division multiplexing the odd harmonic components is as follows:
(1) after the value of the phase angle is specified, the corresponding parameters of fractional order operation, defined as I, are calculated for the modulation of 3 harmonics 1 At this time, the order γ of a fractional order operation is corresponded 1 To achieve a specified phase shift of the 3 rd harmonic;
(2) the 5 th harmonic wave needs to be subjected to phase shift modulation with the same phase angle, and the corresponding parameters of fractional order operation can be calculated and defined as I 2 At this time, the order γ of a fractional order operation is corresponded 2 To achieve a specified phase shift of the 5 th harmonic;
(3) the same size needs to be done for the 7 th harmonicThe phase angle of the phase modulator can calculate the corresponding parameters of fractional order operation, which are defined as I 3 At this time, the order γ of a fractional order operation is corresponded 3 To achieve a specified phase shift of the 7 th harmonic;
by analogy, other odd harmonics can be phase-shifted and modulated, wherein the phase is selected according to the phase-frequency characteristic curve.
And furthermore, the receiving end provides a coherent carrier wave with the same frequency and phase, and the coherent carrier wave is multiplied by the received modulated signal, and the low-frequency component is taken out through a low-pass filter to obtain the original baseband modulated signal.
The invention has the beneficial effects that: in the invention, electric energy and signals are transmitted from the transmitting end to the receiving end through the same magnetic circuit mechanism, thereby reducing electromagnetic interference in the system; the characteristics of high frequency and low energy of harmonic waves are fully utilized, and high-speed signal transmission is realized; the electric energy transmission and the information transmission are carried out simultaneously, so that smaller signal delay is realized; the frequency division multiplexing method can ensure that signals transmitted in each sub-channel are not interfered with each other, effectively reduce the influence of multipath and frequency selective channels on the rise of the bit error rate of a receiving end and effectively improve the spectrum efficiency; the influence between the electric energy and the signal is small, and the modulation and demodulation processes of the signal can be realized under the condition that the transmission performance of the wireless electric energy is not influenced; the method can assist the wireless power transmission system to realize more complex and changeable control strategies.
Drawings
Fig. 1 is a simple structural block diagram of the system of the present invention (in fig. 1, a full-bridge inverter is composed of four high-power mosfets, and a fractional order modulation module may use an ASIC to implement the digital modulation process, or use a programmable device of a DSP or an FPGA, in the present invention, a DSP is used, the model is tms320f28335, a PWM output module is implemented by using an external EPWM integrated inside the tms320f28335, and a carrier multiplication module and a coherent demodulation module are implemented by using a programmable device of a DSP or an FPGA);
FIG. 2 is a graph of average voltage versus phase angle for a full bridge inverter;
FIG. 3 is a diagram showing the result of constant fractional order calculation (orders 0, 1/4, 1/2, 3/4, 1, 5/4) on sinusoidal signals;
FIG. 4 is a diagram of the main waveforms of the present invention when different signals are transmitted;
FIG. 5 is a schematic diagram of frequency division multiplexing of complex odd harmonics;
FIG. 6 is a diagram of a reference matlab model for the fundamental filter;
FIG. 7 is a diagram of a reference matlab model for a polyphase filter.
Detailed Description
The embodiments of the present invention are specifically as follows.
As shown in fig. 1 to 7, the present invention includes
A full-bridge inverter 1 for converting a dc voltage into an ac voltage in a three-level state by means of a phase-shifted full-bridge;
the LCC resonant network transmitting end 2 is used for improving the performance of the square wave output by the full-bridge inverter 1, adjusting the proportion of the fundamental wave and the residual component output by the full-bridge inverter 1, controlling the output gain of the full-bridge inverter 1 and the proportion of reactive power and active power, and transmitting wireless energy;
the LCC resonant network transmitting end 2 is used for improving the performance of the square wave transmitted by the LCC resonant network transmitting end 2, adjusting the proportion of the fundamental wave and the residual component transmitted by the LCC resonant network transmitting end 2, controlling the output gain of the LCC resonant network transmitting end 2 and the proportion of the reactive power and the active power, and receiving the wireless LCC resonant network receiving end 3;
the signal pickup circuit 4 is used for picking up odd harmonic signals in the wireless energy received by the LCC resonant network receiving end 3 and sorting the odd harmonic signals in advance;
a fractional order phase shift modulation module 5, which is used for carrying out single side band modulation on input signals in a fractional order phase shift mode, synthesizing and recording information to be carried into PWM driving signals, inputting the PWM driving signals into the full bridge inverter 1, and generating alternating voltage with the information by the full bridge inverter;
a demodulation module 6 for demodulating the odd harmonic signals of different frequencies of the complex channels output by the signal pickup circuit 4 respectively based on a coherent demodulation mode; and
and a passive rectification and output terminal 7 for converting the received ac voltage into a dc voltage and outputting it.
Fractional order PI of the fractional order phase shift modulation module 5 γ The operation is realized by the Grunwald-letnikov definition, which is:
where γ in formula 1 is the order of the fractional order, h represents the step length, j represents the number of terms of the counting element, t represents the time, t represents 0 Which represents the time of the phase shift,
is the sign of runwald-letnikov fractional calculus.
Fractional order PI γ The method for implementing the operation on the microcomputer (or the method for implementing the operation through software) comprises the following steps:
the limiting operation in the equation can be approximately neglected when the step h is chosen to be small enough, so that the fractional derivative and integral under the definition of GL can be directly calculated by the following equation:
in the formula of omega j Is a coefficient of a binomial form, h denotes a step size, j denotes the number of terms of the counting element, t denotes time, t denotes 0 Which represents the time of the phase shift,
is the sign of runwald-letnikov fractional calculus, with the following recurrence relation:
when a single sinusoidal component is calculated, a phase shift effect is generated, and the phase shift effect can be just used for phase shift modulation. The specific resulting effect is shown in fig. 3:
the phase of the phase shift can be accurately controlled by the order gamma of fractional order, and according to the analysis of the relation between the average voltage and the phase angle of the full-bridge inverter, the amplitude of the harmonic component can be severely influenced by slight phase change, but the function of electric energy transmission cannot be influenced. The simulation diagram when different signals are output is shown in fig. 4. In FIG. 4, there are four key signals, U ab Is the three-level voltage (i.e., the voltage input to the LCC resonant network) of the output leg of the full-bridge inverter, i p Is the current flowing into the LCC resonant network, U 3 Is the third harmonic component, U 0 Is the fundamental component.
Meanwhile, the phase shift modulation process of specific harmonic components can be realized by modulating parameters of fractional order operation, which are defined as I. Thereby realizing frequency division multiplexing of a plurality of odd harmonic components. The specific process is as follows:
after the value of the phase angle is specified, the corresponding parameters of fractional order operation, defined as I, are calculated for the modulation of 3 harmonics 1 At this time, the order γ of a fractional order operation is corresponded 1 To achieve a specified phase shift of the 3 rd harmonic.
The 5 th harmonic wave needs to be subjected to phase shift modulation with the same phase angle, and the corresponding parameters of fractional order operation can be calculated and defined as I 2 At this time, the order of a fractional order operation is corresponded to 2 To achieve a specified phase shift of the 5 th harmonic.
The 7 th harmonic waves need to be subjected to phase shift modulation of phase angles with the same magnitude, and corresponding parameters of fractional order operation can be calculated and defined as I 3 At this time, the order γ of a fractional order operation is corresponded 3 To achieve a specified phase shift of the 7 th harmonic.
By analogy, other odd harmonics can be phase-shifted and modulated, wherein the phase is selected according to the phase-frequency characteristic curve. But the higher the number of odd harmonics, the lower the proportion, which means that it is more difficult to pick up these signals from the radio energy at the time of demodulation. On the other hand, however, a higher order means a higher frequency, so that higher harmonics can carry more information.
In fact, the fractional order calculation of the sinusoidal signal at a given frequency will result in a corresponding sinusoidal signal (the amplitude and phase will change according to the order), while the n-th harmonic component and the sinusoidal signal obtained after the constant fractional order calculation are called I-th harmonic component and the sinusoidal signal obtained after the phase difference between the n-th harmonic component and the "desired phase value" is called I n-1/2 . I above 1 、I 2 And I 3 It follows from this. Because each I n-1/2 Given the frequency and amplitude corresponding to the parameters of the associated and unique fractional order operation, the corresponding order γ can then be mathematically derived.
This process is shown in fig. 5, where x0(n), x1(n), and x2(n) may be serial-to-parallel conversion of the same signal sequence or different sequences, according to the specification of the communication protocol. The C/D is a calculation function for splicing a plurality of signals of different frequency bands into a broadband signal, and mainly comprises three operations: 1) Up-sampling (up-sample); 2) filtering (fir); 3) and (sum).
When the related demodulation of frequency division multiplexing is carried out, a receiving end provides a coherent carrier wave with the same frequency and phase, the coherent carrier wave is multiplied with the received modulated signal, and the low-frequency component is taken out through a low-pass filter, so that the original baseband modulation signal can be obtained. According to the above-written fourier expression of the square wave output by the inverter of the line power transmission system, it can be known that, after the operating frequency is specified, the frequency of each odd harmonic is in the odd-numbered multiple of the operating frequency, so that the odd harmonic signals of each number of times can be sorted one by the in-phase coherent carrier waves of the odd-numbered multiple of the operating frequency, and the information carried by the odd harmonic signals can be obtained by demodulation.
The demodulation method for frequency division multiplexing of complex odd harmonics is basically the inverse process of transmission, and is realized by using a basic filter and a polyphase filter respectively, and the specific implementation method is shown in the embodiment.
1) Fractional phase shift example:
the reference matlab model of fractional phase shift is realized by a discretization expression defined by Grunwald-letnikov:
the reference matlab model is as follows:
2) an embodiment of coherent demodulation of frequency division multiplexing:
the receiving end of frequency division multiplexing is the inverse process of transmission, and is realized by using a basic filter and a polyphase filter respectively:
the reference matlab model of the basic filter, the actual model can be performed by a filter of a hardware resonant network or a software filtering mode, and the specific parameters are designed according to data such as an open-loop transfer function and loop parameters of a controlled system:
polyphase filter, derivation process:
let l be iD + p, D denote the number of signal paths after decomposition, where D is 4
Order to
And obtaining the real part of the result to obtain the solution.
The actual model of the reference matlab model of the polyphase filter can be performed by a filter of a hardware resonant network or a software filtering mode, and the specific parameters are designed according to data such as an open-loop transfer function and loop parameters of a controlled system:
finally, it should be emphasized that the above-described preferred embodiments of the present invention are merely examples of implementations, rather than limitations, and that many variations and modifications of the invention are possible to those skilled in the art, without departing from the spirit and scope of the invention.
Claims (5)
1. A fractional order phased communication system for an LCC wireless power transfer system, comprising: it comprises
A full-bridge inverter (1) for converting a DC voltage into an AC voltage in a three-level state by means of a phase-shifted full-bridge;
the LCC resonant network transmitting end (2) is used for improving the performance of the square wave output by the full-bridge inverter (1), adjusting the proportion of the fundamental wave and the residual component output by the full-bridge inverter (1), controlling the output gain of the full-bridge inverter (1), controlling the proportion of reactive power and active power and transmitting wireless energy;
the device is used for improving the performance of the square wave transmitted by the LCC resonant network transmitting end (2), adjusting the proportion of the fundamental wave and the residual component transmitted by the LCC resonant network transmitting end (2), controlling the output gain of the LCC resonant network transmitting end (2) and the proportion of reactive power and active power, and receiving the wireless-performance LCC resonant network receiving end (3);
the signal pickup circuit (4) is used for picking up odd harmonic signals in the wireless energy received by the LCC resonant network receiving end (3) and sorting the odd harmonic signals in advance;
the fractional order phase shift modulation module (5) is used for modulating the input signal in a single sideband way by a fractional order phase shift mode, synthesizing and recording the information to be carried into a PWM driving signal, inputting the PWM driving signal into the full-bridge inverter (1), and generating alternating voltage with the information by the full-bridge inverter;
a demodulation module (6) for demodulating the odd harmonic signals of different frequencies of the complex channels output by the signal pickup circuit (4) respectively based on a coherent demodulation mode; and
and a passive rectification and output terminal (7) for converting the received alternating voltage into a direct voltage and outputting the direct voltage.
2. The LCC wireless power transmission system according to claim 1, wherein the fractional order phase shift modulation module (5) has fractional order PI γ The operation is realized by the Grunwald-letnikov definition, which is:
where γ in formula 1 is the order of fractional order, h represents the step size, j represents the number of terms of the counting element, t represents time, t represents 0 Which represents the time of the phase shift,
is the sign of runwald-letnikov fractional calculus.
3. The LCC wireless power transmission system according to claim 2, wherein the fractional order PI is a fractional order phase modulation communication system γ The specific operation steps are as follows:
when the selected step h is sufficiently small, the limiting operation in equation 1 is approximately neglected, where the fractional derivative and integral under the definition of Grunwald-letnikov is directly calculated from equation 2 below:
in formula 2,. omega j Is a coefficient of a binomial form, h denotes a step size, j denotes the number of terms of the counting element, t denotes time, t denotes 0 Which represents the time of the phase shift,
is the sign of runwald-letnikov fractional calculus, with the following recurrence relation:
ω 0 ＝1，
when a single sinusoidal component is calculated, a phase shift is generated, the phase shift is used for phase shift modulation, the phase of the phase shift is controlled by the order gamma of fractional order, and the fractional order phase shift is realized according to the relation between the average voltage and the phase angle of the full-bridge inverter (1).
4. The system of claim 3, wherein the frequency division multiplexing of the odd harmonic components is performed by:
(1) after the value of the phase angle is specified, the corresponding parameters of fractional order operation, defined as I, are calculated for the modulation of 3 harmonics 1 At this time, the order γ of a fractional order operation is corresponded 1 To achieve a specified phase shift of the 3 rd harmonic;
(2) the 5 th harmonic wave needs to be subjected to phase shift modulation with the same phase angle, and the corresponding parameters of fractional order operation can be calculated and defined as I 2 At this time, the order γ of a fractional order operation is corresponded 2 To achieve a specified phase shift of the 5 th harmonic;
(3) the 7 th harmonic waves need to be subjected to phase shift modulation of phase angles with the same magnitude, and corresponding parameters of fractional order operation can be calculated and defined as I 3 At this time, the order γ of a fractional order operation is corresponded 3 To achieve a specified phase shift of the 7 th harmonic;
and so on, performing phase shift modulation on other odd harmonics, wherein the phase is selected according to a phase-frequency characteristic curve.
5. The fractional order phase modulation communication system for the LCC wireless power transmission system according to claim 4, wherein the receiving end provides a coherent carrier with same frequency and phase, and after multiplying the coherent carrier with the received modulated signal, the low frequency component is taken out by the low pass filter to obtain the original baseband modulation signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210398971.0A CN114915317B (en) | 2022-04-16 | 2022-04-16 | Fractional tone communication system for LCC wireless power transmission system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210398971.0A CN114915317B (en) | 2022-04-16 | 2022-04-16 | Fractional tone communication system for LCC wireless power transmission system |
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