CN108683274B - A kind of parallel wireless power transfer method and device of the multiple target of frequency division multiple access - Google Patents
A kind of parallel wireless power transfer method and device of the multiple target of frequency division multiple access Download PDFInfo
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- CN108683274B CN108683274B CN201810580731.6A CN201810580731A CN108683274B CN 108683274 B CN108683274 B CN 108683274B CN 201810580731 A CN201810580731 A CN 201810580731A CN 108683274 B CN108683274 B CN 108683274B
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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
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
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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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Abstract
The present invention discloses a kind of parallel wireless power transfer method and device of multiple target of frequency division multiple access, this method comprises: successively individually being sent frequency to the time reversal mirror TRM being made of N number of TR antenna by energy target from M is f1~fMSingle-frequency charge request signal, accordingly, TRM can record M group acquisition signal；Then, to frequency f1~fMM group TRM acquisition signal make time reversal processing (be reduced to when single-frequency phase conjugation realize), obtain M group TRM return path signal；Finally, being combined this M group TRM return path signal at one group of multifrequency TRM delivery of energy signal, and the signal radiation is gone out by TRM, i.e., generates multiple spot TR focousing fields using multiple frequencies of putting, while being conveyed energy by energy target for M.Methods and apparatus of the present invention can make it is each by can target exclusively enjoy an independent delivery of energy frequency point, successfully solves the problems, such as while being the parallel delivery of energy of multiple users and not interfere with each other.
Description
Technical field
This method is related to wireless power transfer technology, and in particular to a kind of parallel wireless power transfer method of the multiple target of frequency division multiple access and
Device.
Background technique
Wireless power transfer is a study frontier of present energy transmission field, in recent years by the pass of scientific circles and industrial circle
Note.Existing wireless power transfer technology mainly has induction delivery of energy, electromagnetic resonance delivery of energy and electromagnetic wave delivery of energy.
It is induction to pass through dispatch coil with two kinds of delivery of energy technologies of electromagnetic resonance and exchange wireless energy, transmission range
Generally less than coil diameter is only applicable to short distance charging, mainly using the charging of the charging of mobile devices such as promising mobile phone, MP3
It pads (charging equipment need to be lain on charging pad), for the charging pile (coil diameter is big, and position is fixed) etc. of electric car charging.
Electromagnetic wave delivery of energy can be divided into broadcast type delivery of energy and directional type delivery of energy: broadcast type delivery of energy utilizes omnidirectional antenna to ring around
Border radiated electromagnetic energy, the disperse and decaying of spatial electromagnetic wave are huge, and efficiency is extremely low；Directional type delivery of energy utilizes the day of high directionality
Line collects electromagnetic energy in one direction, and efficiency is greatly improved, but dual-mode antenna needs stringent alignment and bore face is big,
It is dfficult to apply to need by scenes such as the mobile chargings of energy device miniaturization, and orient delivery of energy wave beam to damage the human body on path
Health.
Time reversal (Time Reversal, TR) is a kind of novel electromagnetic wave space control technique, in recent years by
Applied to wireless power transfer field.When carrying out delivery of energy using time reversal array, without tracking, positioning device, only with omnidirectional
Small size array element can focus on spatial electromagnetic wave a bit, by energy device miniaturization, the raising of wireless power transfer efficiency, movement
Charging etc. has very big advantage.Such as application No. is 201010568332.1 patents of invention, disclose a kind of base
In the wireless sensor network node wireless charging system and method for time reversal, the broadband TR technology based on short pulse is
Wireless sensor network node charges, but utilizes TR short pulse transmission energy there are energy transmissions unstable, TR physics
Realize the defects of difficult.
For this purpose, in 2016, inventor Li Tao, Zhao Deshuang, Guo Fei et al. have submitted one application No. is
201611006929.0 patent of invention, the microwave narrowband wireless power transfer method and device based on focus wave that it discloses a kind of,
Short pulse is replaced to carry out TR delivery of energy using narrowband or simple signal, energy transmission is unstable when successfully solving short pulse TR delivery of energy
The problem of, and reduce the difficulty of TR physics realization.But above-mentioned TR delivery of energy scheme does not point out how to solve multiple target delivery of energy
The problem of, especially while for the parallel delivery of energy problem of multiple target of multiple users charging.
One application No. is 201710058090.3 patent of invention, discloses a kind of indoor wireless energy output system and nothing
Line delivery of energy method, the delivery of energy method solve in conventional method and are only applicable to regular row using Electromagnetic Wave Propagation progress wireless power transfer
The identical antenna sets success rate transmitting battle array of cloth cellular construction, single frequency operation, the multiple target beam optimization time is long, sets to without charging
The standby safety problem for generating severe jamming, being difficult to ensure the mankind in delivery of energy space, animals and plants and the equipment without charging.But
Delivery of energy request signal in the patent is a broadband signal, needs to carry out complicated, time-consuming Fourier transformation in broadband
With time reversal combinatorial operation, the broadband excitation signal of power emission array can be just obtained.
Summary of the invention
The brief overview about the embodiment of the present invention is given below, in order to provide about certain aspects of the invention
Basic comprehension.It should be appreciated that outlined below is not about exhaustive general introduction of the invention.It is not intended to determine this hair
Bright key or pith, nor is it intended to limit the scope of the present invention.Its purpose only provides certain in simplified form
A little concepts, taking this as a prelude to a more detailed description discussed later.
Binding time inversion technique of the present invention and frequency division multiple access technology, propose that a kind of multiple target of frequency division multiple access is wireless parallel
Delivery of energy method and device, each to be exclusively enjoyed a delivery of energy frequency point by energy target, the more mesh for successfully solving while charging for multiple users
Mark parallel delivery of energy problem.Firstly, M by can target successively individually to the time reversal mirror (Time being made of N number of TR antenna
Reversal Mirror, TRM) send frequency f1~fMSingle-frequency charge request signal, accordingly, TRM can record M group acquisition
Signal；Then, to frequency f1~fMM group TRM acquisition signal make time reversal processing and (it is real to be reduced to phase conjugation when single-frequency
It is existing), obtain M group TRM return path signal；Finally, this M group TRM return path signal is combined into one group of multifrequency TRM delivery of energy signal, and by
TRM goes out the signal radiation, i.e., generates multiple spot TR focousing fields using multiple frequencies of putting, while being conveyed energy by energy target for M
Amount.
Specifically, a kind of parallel wireless power transfer method of multiple target of frequency division multiple access is provided according to the one aspect of the application,
Applied in wireless power transfer system, which includes N number of TR antenna TR1~TRNAnd M is a by energy antenna EC1~ECM；N number of TR
Antenna TR1~TRNTRM is constituted as array element, M by energy antenna EC1~ECMRespectively with frequency point f1~fMIt corresponds, ECi(i=
1~M) send and receive frequency only as fiSignal；The parallel wireless power transfer method of the multiple target comprises the following processes:
M are successively individually sent frequency f to the time reversal mirror TRM being made of N number of TR antenna by energy antenna1~fMList
Frequency charge request signal；
The reception signal of each array element of acquisition time inverting mirror TRM, obtaining frequency is respectively f1~fMM group TRM acquire letter
Number；
To frequency f1~fMM group TRM acquisition signal make time reversal processing, obtain M group TRM return path signal；
This M group TRM return path signal is combined into one group of multifrequency TRM delivery of energy signal, and is believed multifrequency TRM delivery of energy by TRM
Number radiate, i.e., generate multiple spot TR focousing fields using multiple point frequencies, at the same for M by can target convey energy.
Specifically, the specific implementation steps are as follows for the above-mentioned parallel wireless power transfer method of multiple target:
Step 1: by M by can antenna successively independent tranmitting frequency f1~fMSingle-frequency charge request signal x1(t)~xM
(t), time-domain expression xi(t)=Axcos(2πfit+φi), phasor expression formula (single frequency sinusoidal signal it is available containing only amplitude with
The phasor representation of phase information) it is Xi=Axexp(i·φi)；AxFor signal xi(t) amplitude, φiFor signal xi(t) phase
Position；
Step 2: accordingly, can collect frequency by each array element of TRM is respectively f1~fMM group signal y1,1(t)~yN,1
(t),y1,2(t)~yN,2(t),L,y1,M(t)~yN,M(t), wherein For volume
Product oeprator, hj,i(t) for by energy antenna ECiWith TRM array element TRjBetween channel impulse response.yj,i(t) phasor expression
Formula Yj,i=Ax·exp(i·φi)·Hj,i(fi), H in formulaj,i(fi) it is hj,i(t) Fourier transformation is in frequency point fiValue；
Step 3: time reversal processing being carried out to these TRM acquisition signal, M group TRM return path signal can be obtainedWhereinDue to single-frequency time reversal
It can be equivalent to phase conjugation,Phasor expression formula beSubscript * is indicated altogether in formula
Yoke operation；
Step 4: if by frequency fiTRM return path signalEach array element of feed-in TRM, generation are focused on by energy
Target ECiTR single point focus field, ECiIt is by energy signalIts phasor expression formula isAmplitude is
Assuming that by can target ECiDesired wireless charging signal amplitude is Azi, by the combining of M group simple signal more than one group
Frequency TRM delivery of energy signalWhereinThen it is fed into each battle array of TRM
Member；
Step 5: wireless energy, corresponding frequency point f can be received by energy target positioned at each focal positioniBy can target
ECiBy can signal waveform beAmplitude is Azi。
As it can be seen that the multifrequency finally generated, multiple spot TR focousing field, can according to actual power demand in parallel for multiple by energy
Target conveys energy.In addition, jump procedure 1 emits again when environment changes or the position of energy acceptance antenna changes
Charge request signal, resurveys channel information, and electromagnetic energy can be made still respectively by that can focus at target, to continue to more mesh
Mark the effect of parallel delivery of energy.
According to the another aspect of the application, a kind of parallel wireless power transfer device of multiple target of frequency division multiple access is also provided, including
Energy collecting device and TR energy emitting device；
Energy collecting device include at least for emit charge request signal and receive wireless electromagnetic energy by can day
Linear array, by the high frequency current transitions of the wireless electromagnetic energy received be direct current rectification unit and with TR energy transmitting
The control unit of device progress communication interaction；
TR energy emitting device include for receive charge request signal and emit TR delivery of energy signal TR aerial array,
The detection unit of the phase and amplitude of the charge request signal received is detected, interacts and is used at analysis with energy collecting device
Manage the control processing unit of the excitation for receiving signal and obtaining TR aerial array of TR aerial array；
M of energy collecting device are successively individually sent to the time reversal mirror TRM being made of N number of TR antenna by energy antenna
Frequency f1~fMSingle-frequency charge request signal；It is respectively f that the control processing unit, which obtains the frequency of TR antenna array receiver,1
~fMM group TRM acquire signal, to the M group TRM acquisition signal make time reversal processing (be reduced to when single-frequency phase conjugation in fact
It is existing), obtain M group TRM return path signal；This M group TRM return path signal is combined into one group of multifrequency TRM delivery of energy signal, and will by TRM
Multifrequency TRM delivery of energy signal radiation is gone out, i.e., generates multiple spot TR focousing fields using multiple frequencies of putting, while for M by energy target
Convey energy.
In the TR energy emitting device, the radiation directivity of each TR antenna is unrestricted, can be omnidirectional, orientation and
Non-directional radiation；And energy collecting device is then omnidirectional antenna by energy antenna, comes from each incidence angles degree to receive
The electromagnetic wave energy in direction.In TR energy emitting device, the arrangement of TR bay can be arbitrary, such as square array,
The various linear arrays arrangement such as rectangular array, circular array, elliptical array is also possible to spherical array, ellipsoid array, just
The various face battle array arrangements such as cube surface array, cuboid surface array, polyhedral surface array.
In addition, the multifrequency TR delivery of energy signal of multiple spot TR focousing field, it can be both combined and be generated by multiple simple signals, it can also be with
It is directly generated by analog-digital converter, or first generates the multiple-frequency signal of low-frequency range, then high band will be converted to thereon.
The present invention using the above scheme, has the following beneficial effects:
(1) the frequency division multiple access TR technology that the present invention uses, can be according to reality using the multiple spot TR focousing field that multiple point frequencies generate
Border power demand is conveyed energy by energy target in parallel for multiple, each to be exclusively enjoyed an independent delivery of energy frequency point by energy target, no
It must worry the influence of other frequency fields；
(2) although TR delivery of energy signal of the invention by multiple simple signals be combined at, to each by can for target,
It is all that delivery of energy is carried out using simple signal, compared to wideband shorter pulse times inverting energy output system, high with conveying mean power,
System stabilization and the easily advantages such as realization；
(3) multifrequency TR delivery of energy signal of the invention is directly combined by multiple simple signals and is generated, and is not required to carry out complicated, time-consuming
Fourier transformation；
(4) present invention acquires channel information, shifting can be realized by re-emitting charge request signal at regular intervals
Dynamic charging；
(5) the multifrequency TRM delivery of energy signal in the present invention can quickly show that this is quick in channel circumstance via simple calculating
There is very big advantage in the mobile charging application of variation.
Detailed description of the invention
The present invention can be by reference to being better understood, wherein in institute below in association with description given by attached drawing
Have and has used the same or similar appended drawing reference in attached drawing to indicate same or similar component.The attached drawing is together with following
It is described in detail together comprising in the present specification and forming a part of this specification, and is used to that this is further illustrated
The preferred embodiment and explanation the principle of the present invention and advantage of invention.In the accompanying drawings:
Fig. 1 is the system structure diagram of present example；
Fig. 2 is the structural block diagram of energy collecting device in example of the present invention；
Fig. 3 is the structural block diagram of TR energy emitting device in example of the present invention；
Fig. 4 is in example of the present invention by energy antenna EC1Tranmitting frequency f1Charge request signal；
Fig. 5 is in example of the present invention by energy antenna EC2Tranmitting frequency f2Charge request signal；
Fig. 6 is in example of the present invention by energy antenna EC3Tranmitting frequency f3Charge request signal；
Fig. 7 is in example of the present invention by energy antenna EC4Tranmitting frequency f4Charge request signal；
Fig. 8 is the effect diagram that TRM forms multifrequency Multi-point focusing field in example of the present invention.
Specific embodiment
Illustrate the embodiment of the present invention below with reference to accompanying drawings.In an attached drawing of the invention or a kind of embodiment
The elements and features of description can be combined with elements and features shown in one or more other attached drawings or embodiment.
It should be noted that for purposes of clarity, unrelated to the invention, those of ordinary skill in the art have been omitted in attached drawing and explanation
The expression and description of the component and processing known.
The present invention provides a kind of parallel wireless power transfer method and device of multiple target of frequency division multiple access, the system structure of device
Schematic diagram is as shown in Figure 1.It include 4 in the system of this example by energy antenna (number EC1~EC4, corresponding frequency point is respectively f1
=2.3GHz, f2=2.4GHz, f3=2.5GHz, f4=2.6GHz) and 30 TR antenna (code T R1~TR30).Whole antennas
It is all made of the patch monopole antenna of centre frequency 2.45GHz, bandwidth 500MHz, and constitutes energy with some other devices respectively
Measure collection device and TR energy emitting device.30 TR antennas equally spacedly surround the circular array of a diameter 1.22m, constitute
TRM, 4 are respectively positioned on inside the plane domain that TRM is surrounded by energy antenna.
The structural block diagram of energy collecting device is as shown in Fig. 2, specifically include: collection of energy antenna EC1~EC4, transmitting charging
The wireless electromagnetic energy of request signal and reception from TRM；Bandpass filter BPF1~BPF4, rejection frequency is not f respectively1,
f2,f3,f4Clutter；Simple signal source OSCR1~OSCR4, generation amplitude is all Ax, frequency be respectively f1,f2,f3,f4Single-frequency
Signal；Load LOAD1~LOAD4, the load of each energy collecting device, by DC driven；Fairing PRU1~PRU4, will
Collection of energy antenna EC1~EC4The high frequency current transitions received are supplied to load LOAD at direct current1~LOAD4；Switch S1
~S4, switch bandpass filter BPF1~BPF4With simple signal source OSCR1~OSCR4Or fairing PRU1~PRU4Between
Connection；Control centre OCC_R1~OCC_R4, communication interaction is carried out with the control centre OCC_T of TR energy emitting device, control is opened
Close S1~S4Switching.
The structural block diagram of TR energy emitting device is as shown in figure 3, specifically include: TR antenna TR1~TR30(constituting TRM), connects
Receive charge request signal and transmitting multifrequency TRM delivery of energy signal；Wave detector ED1~ED30, detect TR antenna and receive charge request
The amplitude of signal；Phase discriminator PD1~PD30, detect the phase that TR antenna receives charge request signal；Simple signal source OSCT1
~OSCT4, generation amplitude is all Ay, frequency be respectively f1,f2,f3,f4Single frequency sinusoidal signal；Switch K31~K34, control single-frequency
Signal source OSCT1~OSCT4On-off；Combiner SUM31, switch K will be come from31~K34Multichannel simple signal be combined at all the way
Multiple-frequency signal output；Constant power distributor EPD, by combiner SUM31It is divided into 30 tunnels to the multiple-frequency signal constant power of output；Branch
Device FD1~FD30, it is f that the EPD multiple-frequency signal exported is decomposed into 4 tunnel frequencies again1,f2,f3,f4Simple signal；Phase shifter
F1PS1~F4PS1,F1PS2~F4PS2,L,F1PS30~F4PS30, change FD respectively as desired1~FD304 tunnel single-frequency output letter
Number phase；Amplifier F1PA1~F4PA1,F1PA2~F4PA2,L,F1PA30~F4PA30, amplify FD respectively as desired1~
FD30The amplitude of 4 tunnel single-frequency output signals；Combiner SUM1~SUM30, F1PA will be come from respectively1~F4PA1,F1PA2~F4PA2,
L,F1PA30~F4PA304 road different frequencies simple signal combining at multiple-frequency signal all the way export；Switch K1~K30, switching
TR antenna TR1~TR30With ED1~ED30Or PD1~PD30Or SUM1~SUM30Connection；Control centre OCC_T, with collection of energy
The control centre OCC_R of device1~OCC_R4Communication interaction is carried out, receives and comes from ED1~ED30And PD1~PD30Information, control
Switch K1~K34Switching, control phase shifter F1PS1~F4PS1,F1PS2~F4PS2,L,F1PS30~F4PS30Phase shift and
Amplifier F1PA1~F4PA1,F1PA2~F4PA2,L,F1PA30~F4PA30Amplification factor.
The wireless power transfer method of the device comprises the following processes:
Step 1: successively independent drive is all by energy antenna, emits the single-frequency charge request signal of different frequency, and record
TRM acquires signal.
Independent drive is by energy antenna EC first1, and the TRM recorded at this time acquires signal, 4 small steps of concrete operations point:
①OCC_R1Control S1So that BPF1With OSCR1It is connected, OCC_R2~OCC_R4Control S2~S4So that BPF2~BPF4
With PRU2~PRU4It is connected, makes EC1Tranmitting frequency f1Charge request signal
2. after emitting charge request signal, OCC_T controls K1~K30So that TR1~TR30With ED1~ED30It is connected, record
The amplitude information α of TRM acquisition signal1,1~α30,1；
3. after amplitude information acquires, OCC_T controls K1~K30So that TR1~TR30With PD1~PD30It is connected, record
TRM acquires signal in frequency f1Phase information φ1,1~φ30,1；
After 4. width phase information acquires, frequency f1TRM acquisition signal can be denoted as Yj,1=αj,1·exp(i·
φj,1)。
Then, successively independent drive EC in the same way2,EC3,EC4, sending frequency respectively is f2,f3,f4Charging
Request signalRecord corresponding TRM acquisition letter
Number；
Finally after whole TRM acquisition signal is recorded, OCC_T controls K1~K30So that TR1~TR30With SUM1~
SUM30It is connected, and notifies OCC_R1~OCC_R4, by OCC_R1~OCC_R4Control S1~S4So that EC1~EC4With PRU1~PRU4
It is connected.
Step 2: the information recorded is handled.
3 small steps of concrete operations point:
1. calculating by energy antenna ECi(i=1~4) and TR antenna TRjIn frequency point f between (j=1~30)iTransmission
Function
2. calculating focuses on ECi, frequency fiTRM return path signal
If 3. calculating TRM return path signalWhen feed-in TRM, by energy antenna ECiReception signal
Step 3: each single-frequency components of multifrequency TRM delivery of energy signal are calculated.
Final multifrequency TRM delivery of energy signal is respectively f by 4 tunnel frequencies1,f2,f3,f4Simple signal be combined to obtain, it is assumed that
ECi(i=1~4) desired wireless charging signal amplitude is Azi, then multifrequency TRM delivery of energy signal intermediate frequency rate is fiSingle-frequency point
Amount should beWherein
Step 4: multifrequency TRM delivery of energy signal, and feed-in TRM are generated, multiple spot, multifrequency TR focousing field are formed.
4 small steps of concrete operations point:
1. OCC_T control switch K31~K34, make K31~K34Connection；
2. OCC_T controls F1PA1~F1PA30It is equal to its amplification factorControl
F2PA1~F2PA30It is equal to its amplification factorControl F3PA1~F3PA30Put it
Big multiple is equal toControl F4PA1~F4PA30It is equal to its amplification factor
3. OCC_T controls F1PS1~F1PS30Make it in frequency f1Insertion phase shift be-φ1,1~-φ30,1, control F2PS1
~F2PS30Make it in frequency f2Insertion phase shift be-φ1,2~-φ30,2, control F3PS1~F3PS30Make it in frequency f3Insert
Entering phase shift is-φ1,3~-φ30,3, control F4PS1~F4PS30Make it in frequency f4Insertion phase shift be-φ1,4~-φ30,4；
4. OCC_T controls K1~K30So that TR1~TR30With SUM1~SUM30It is connected.
Step 5: the reception of wireless energy.
Multiple spot, multifrequency TR focousing field will be focused on simultaneously by can be at antenna, by OCC_R1~OCC_R4Control switch S1~S4
So that BPF1~BPF4With PRU1~PRU4It is connected.At this time by energy antenna EC1~EC4Reception signal amplitude be Az1~Az4, meet
It is expected that requiring.Rectification circuit PRU1~PRU4By EC1~EC4Received high frequency current transitions are direct current and are load LOAD1~
LOAD4Power supply.
When environment changes or the position of collection of energy antenna changes, jump procedure one emits charge request again
Signal resurveys radio channel information, and electromagnetic energy can be made still respectively by that can focus at antenna, to continue to multiple target simultaneously
The effect of row delivery of energy.
In this example, 30 TR antennas equally spacedly surround a circular array, constitute TRM.But TR in practical applications
Antenna can be by rectangle, and ellipse, the modes such as triangle are arranged, can also be arranged with unequal interval, it might even be possible to arbitrarily put position
It sets.
In this example, multiple-frequency signal is directly combined by multiple simple signals and is generated.But it in practical applications, can also be straight
It connects and is generated by analog-digital converter, or by the analog-digital converter of low rate, multiple single-frequency sources of low-frequency range, up-conversion to high band is produced
It is raw.
In the description above to the specific embodiment of the invention, for the feature a kind of embodiment description and/or shown
It can be used in one or more other embodiments with same or similar mode, with the feature in other embodiment
It is combined, or the feature in substitution other embodiment.
It should be emphasized that term "comprises/comprising" refers to the presence of feature, element, step or component when using herein, but simultaneously
It is not excluded for the presence or additional of one or more other features, element, step or component.
Although being had been disclosed above by the description to specific embodiments of the present invention to the present invention, it answers
The understanding, above-mentioned all embodiments and example are exemplary, and not restrictive.Those skilled in the art can be in institute
Design is to various modifications of the invention, improvement or equivalent in attached spirit and scope of the claims.These modification, improve or
Person's equivalent should also be as being to be considered as included in protection scope of the present invention.
Claims (8)
1. a kind of parallel wireless power transfer method of the multiple target of frequency division multiple access is applied in wireless power transfer system, which includes N number of
TR antenna TR1~TRNAnd M is a by energy antenna EC1~ECM；N number of TR antenna TR1~TRNTRM is constituted as array element, M by energy
Antenna EC1~ECMRespectively with frequency point f1~fMIt corresponds, ECiOnly sending and receiving frequency is fiSignal, i=1~M；This is more
Target parallel wireless power transfer method comprises the following processes:
Process 1:M are successively individually sent frequency f to the time reversal mirror TRM being made of N number of TR antenna by energy antenna1~fM's
Single-frequency charge request signal；
Process 2: the reception signal of each array element of acquisition time inverting mirror TRM, obtaining frequency is respectively f1~fMM group TRM acquire letter
Number；
Process 3: to frequency f1~fMM group TRM acquisition signal make time reversal processing, obtain M group TRM return path signal；
Process 4: this M group TRM return path signal is combined into one group of multifrequency TRM delivery of energy signal, and by TRM by multifrequency TRM delivery of energy
Signal radiation is gone out, then generates multiple spot TR focousing fields by multiple frequencies of putting, while being conveyed energy by energy target for M；
The process 1 and process 2 specifically include following process:
Tranmitting frequency f is successively individually distinguished by energy antenna by M1~fMSingle-frequency charge request signal x1(t)~xM(t), xi(t)
Time-domain expression be xi(t)=Axcos(2πfit+φi), phasor expression formula is Xi=Axexp(i·φi), i=1~M, AxFor
Signal xi(t) amplitude, φiFor signal xi(t) phase；
Collecting frequency by each array element of TRM is respectively f1~fMM group TRM acquire signal y1,1(t)~yN,1(t),y1,2(t)~
yN,2(t),L,y1,M(t)~yN,M(t), wherein For convolution algorithm symbol, hj,i
(t) for by energy antenna ECiWith TRM array element TRjBetween channel impulse response, i=1~M；
yj,i(t) phasor expression formula Yj,i=Ax·exp(i·φi)·Hj,i(fi), H in formulaj,i(fi) it is hj,i(t) Fourier
Transformation is in frequency point fiValue.
2. the parallel wireless power transfer method of multiple target according to claim 1, it is characterised in that: the multiple target is parallel wireless defeated
Energy method further include:
Process 5: when environment changes or the position of energy acceptance antenna changes, jump procedure 1 emits charge request again
Signal resurveys channel information, and electromagnetic energy is made still respectively by that can focus at target, to continue to the parallel delivery of energy of multiple target
Effect.
3. the parallel wireless power transfer method of multiple target according to claim 1, it is characterised in that: the process 3 specifically includes:
Time reversal processing is carried out to collected TRM acquisition signal, obtains M group TRM return path signalWhereinPhase scale
Up to formulaSubscript * indicates conjugate operation in formula.
4. the parallel wireless power transfer method of multiple target according to claim 3, it is characterised in that: the process 4 specifically includes:
It calculates frequency fiTRM return path signalEach array element of feed-in TRM, generation are focused on by energy target ECi's
When the single point focus field TR, EC is reachediBy can signal waveformIts phasor expression formula isAmplitude is
One group of multifrequency TRM delivery of energy signal that M group simple signal is synthesizedFeed-in TRM, whereinAziFor by energy target ECiDesired wireless charging signal amplitude；
Positioned at each focal position by energy intended recipient to wireless energy, corresponding frequency point fiBy can target ECiBy can signal wave
Shape isAmplitude is Azi。
5. a kind of parallel wireless power transfer device of the multiple target of frequency division multiple access, including energy collecting device and TR energy emitting device；
Energy collecting device include at least for emit charge request signal and receive wireless electromagnetic energy by can antenna array
Column, by the high frequency current transitions of the wireless electromagnetic energy received be direct current rectification unit and with TR energy emitting device
Carry out the control unit of communication interaction；
TR energy emitting device includes for receiving charge request signal and emitting the TR aerial array of TR delivery of energy signal, detection
The detection unit of the phase and amplitude of the charge request signal received interacts with energy collecting device and is used to analyze processing TR
The control processing unit of the excitation for receiving signal and obtaining TR aerial array of aerial array；
M of energy collecting device are successively individually sent frequency to the time reversal mirror TRM being made of N number of TR antenna by energy antenna
f1~fMSingle-frequency charge request signal；It is respectively f that the control processing unit, which obtains the frequency of TR antenna array receiver,1~fM
M group TRM acquire signal, to the M group TRM acquire signal make time reversal processing, obtain M group TRM return path signal；By this M group
TRM return path signal combining multifrequency TRM delivery of energy signal radiation is gone out at one group of multifrequency TRM delivery of energy signal, and by TRM, then by
Multiple frequencies of putting generate multiple spot TR focousing fields, while being conveyed energy by energy target for M；
The energy collecting device specifically includes:
Collection of energy antenna EC1~ECM, emit charge request signal and receive the wireless electromagnetic energy from TRM；
Bandpass filter BPF1~BPFM, rejection frequency is not f respectively1-fMClutter；
Simple signal source OSCR1~OSCRM, generation amplitude is all Ax, frequency be respectively f1-fMSimple signal；
Load LOAD1~LOADM, the load of each energy collecting device, by DC driven；
Fairing PRU1~PRUM, by collection of energy antenna EC1~ECMThe high frequency current transitions received are provided at direct current
Give load LOAD1~LOADM；
Switch S1~SM, switch bandpass filter BPF1~BPFMWith simple signal source OSCR1~OSCRMOr fairing PRU1~
PRUMBetween connection；
Control centre OCC_R1~OCC_RM, communication interaction, control switch S are carried out with TR energy emitting device1~SaSwitching.
6. the parallel wireless power transfer device of multiple target according to claim 5, it is characterised in that: the TR energy emitting device
It specifically includes:
TR antenna TR1~TRN, receive charge request signal and transmitting multifrequency TRM delivery of energy signal；
Wave detector ED1~EDN, detect the amplitude that TR antenna receives charge request signal；
Phase discriminator PD1~PDN, detect the phase that TR antenna receives charge request signal；
Simple signal source OSCT1~OSCTM, generation amplitude is all Ay, frequency be respectively f1-fMSingle frequency sinusoidal signal；
Switch KN+1~KN+M, control simple signal source OSCT1~OSCTMOn-off；
Combiner SUMN+1, switch K will be come fromN+1~KN+MMultichannel simple signal combining at multiple-frequency signal all the way export；
Constant power distributor EPD, by combiner SUMN+1It is divided into the road N to the multiple-frequency signal constant power of output；
Splitter FD1~FDN, it is f that the EPD multiple-frequency signal exported is decomposed into the road M frequency again1-fMSimple signal；
Phase shifter F1PS1~FMPS1,F1PS2~FMPS2,L,F1PSN~FMPSN, change FD respectively as desired1~FDNThe M of output
The phase of road simple signal；
Amplifier F1PA1~FMPA1,F1PA2~FMPA2,L,F1PAN~FMPAN, amplify FD respectively as desired1~FDNThe M of output
The amplitude of road simple signal；
Combiner SUM1~SUMN, amplifier F will be come from respectively1PA1~FMPA1,F1PA2~FMPA2,L,F1PAN~FMPANThe road M
The simple signal combining of different frequency is exported at multiple-frequency signal all the way；
Switch K1~KN, switch TR antenna TR1~TRNWith ED1~EDNOr PD1~PDNOr SUM1~SUMNConnection；
Control centre OCC_T, the control centre OCC_R with energy collecting device1~OCC_RMCommunication interaction is carried out, reception comes from
ED1~EDNAnd PD1~PDNInformation, control switch K1~KNAnd KN+1~KN+MSwitching, control phase shifter F1PS1~
FMPS1,F1PS2~FMPS2,L,F1PSN~FMPSNPhase shift and amplifier F1PA1~FMPA1,F1PA2~FMPA2,L,F1PAN~
FMPANAmplification factor.
7. the parallel wireless power transfer device of multiple target according to claim 5, it is characterised in that: the TR energy emitting device
In, the radiation directivity of each TR bay is unrestricted, is omnidirectional, orientation or non-directional radiation；Energy collecting device
Collection of energy antenna is omnidirectional antenna, to receive the electromagnetic wave energy from each incidence angles degree direction；
In TR energy emitting device, the arrangement of each TR antenna includes but is not limited to following arrangement mode: square array, rectangle
Array, circular array, elliptical array, spherical array, ellipsoid array, square surface array, cuboid surface array, multi-panel
Body surface array.
8. the parallel wireless power transfer device of multiple target according to claim 5, it is characterised in that: the multifrequency of multiple spot TR focousing field
TR delivery of energy signal is to be combined to generate by multiple simple signals, is perhaps directly generated by analog-digital converter or first generate low-frequency range
Multiple-frequency signal will be converted to high band thereon again and realize.
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| CN111030324B (en) * | 2019-12-09 | 2021-05-28 | 南京航空航天大学 | Multi-target mobile equipment tracking wireless energy transmission method and system |
| CN113113949B (en) * | 2021-04-12 | 2023-04-25 | 重庆唐古拉科技有限公司 | Method and system for communication of wireless charging device |
| CN113507745B (en) * | 2021-06-23 | 2023-04-18 | 电子科技大学 | Multi-user power distribution method and system based on time reversal wireless energy transmission |
| CN114172280B (en) * | 2021-11-29 | 2023-10-31 | 南京航空航天大学 | Near-field focusing multi-target self-adaptive microwave energy transmission system and method |
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