CN106385115A - Wireless transmission method based on femtosecond laser and electric energy transmission device - Google Patents
Wireless transmission method based on femtosecond laser and electric energy transmission device Download PDFInfo
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- CN106385115A CN106385115A CN201610918691.2A CN201610918691A CN106385115A CN 106385115 A CN106385115 A CN 106385115A CN 201610918691 A CN201610918691 A CN 201610918691A CN 106385115 A CN106385115 A CN 106385115A
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Abstract
The invention discloses a wireless transmission method based on a femtosecond laser and an electric energy transmission device. The flashover discharging between a femtosecond laser transmitter and an electric signal transmitter is collected, the processing is carried out through the wireless transmission technology to obtain stable voltage, which means that the nonlinear phenomenon-filamentation generated by the transmission of a femtosecond laser pulse in the air is used, an electric signal receiving electrode carries out flashover discharging in the femtosecond laser pulse, the voltage pulse of the flashover discharging is filtered and converted into alternating current, and the femtosecond laser pulse is used to carry out far distance wireless power transmission. The peak-peak value of alternating current voltage coupled by a non-contact transformer is reduced to one tenth of the original or even lower, the insulation degree of a back stage circuit can be greatly reduced, and the cost of the back stage circuit is greatly reduced. The output voltage of the invention is direct current voltage which can be used as a power supply by much equipment, and power use requirements in some special conditions such as the wireless transmission of a communication satellite and the power supply of a high speed electric vehicle can be solved.
Description
Technical field
The present invention relates to laser, non-contact power with the technical field automatically controlling and in particular to a kind of swashed based on femtosecond
The wireless power transmission method of light and power transfer.
Background technology
Intense Femtosecond Laser in atmosphere filamentation when, very long low density plasmas post will be produced, generation
Plasma column can be used to excite high-tension electricity, and in atmosphere by high-tension electricity be transmitted to several meters to tens km or even farther
Distance.Femtosecond laser generation technology is expected to solve the need for electricity under some special statuss, such as telecommunication satellite wireless power transmission, height
Fast electric car power supply etc..The pulse signal power of femtosecond laser transmission can set, and can obtain on electric signal receiver
The potential pulse of several kV ~ thousand of kV, its moment impact electric current is up to several kA.
At present, wireless charging mainly has three kinds of modes：Induction, Electromagnetically vibrating and radio waves type.Electromagnetism sense
Formula wireless charging technology is answered to be based on electromagnetic induction principle, electric current flows through and will produce magnetic field during coil, is now not powered on another
Coil insert in this magnetic field, this coil will produce electric current.This wireless charging mode is using very short, the Er Qiesui of distance
The increase of distance, it is very big that electric energy loss can become, and transmission range is essentially Centimeter Level, and need between coil and circuit to shield
Cover.Electromagnetically vibrating wireless charging technology is realized by the magnetic resonance that coil produces same frequency using electric current, by energy
Coil in dispensing device and reception device has identical frequency of vibration, and coil adjustment for magnetic resonance system and is arranged in magnetic
In, transmitting terminal is connected with power supply, and the oscillating magnetic field frequency that transmitting terminal produces is identical with the eigentone of receiving coil
Thus producing resonance in receiving terminal, realize the propagation of energy.Magnetic vibration formula wireless charging technical transmission distance and efficiency are by magnetic field
Strong and weak decision, and being limited in scope of this non-radiating electromagnetic field, can only realize in relatively short distance at present, generally several meters
Scope, be not suitable for long range propagation electric energy, because this technical requirements carries out energy transmission it is therefore desirable to set with specific frequency
Determine characteristic frequency to be protected, and coil dimension is required, if coil dimension is too small, the power that receiving terminal receives will
Significantly reduce.Radio waves type wireless charging technology mainly carries out electric energy transmission using microwave, and microwave launcher is directly to insert
Enter the electronic equipment of commercial power socket, miniature receiving terminal embeds and is electrically charged in electronic equipment, the safe low-frequency electrical that transmitter is occurred
Magnetic wave is caught.Although the transmission range of microwave radiation formula is farthest, because the transmission of microwave radiation formula has huge sky
Between path loss, the through-put power of therefore this charging technique is little, is only capable of transmitting less than the power of 100mW, is only applicable to power non-
Often little electronic equipment.
Peak power density reaches the femtosecond laser of certain value when propagating in atmosphere, occur in the range of certain distance from
Focus on, this typical propagation makes filamentation or automatic control propagate.When the punching of beam constriction seasonal pulse shortens in the propagation direction, and horizontal
Diffraction direction keeps very narrow radius, and spinnbarkeit is neither be frozen, and is not time and Local Structure spatially, filamentation
Can be under the auxiliary not having any external orientation mechanism, the beam diameter keeping very narrow propagates the distance exceeding diffraction length.
The physical principle of in the air filamentation structure is not also apparent from.Although pulse is propagated in filament, a lot of things
Reason mechanism works, but forming process is mainly due to two nonlinear effects：One side optical Kerr effect, offsets diffraction simultaneously
And according to focus on light beam itself；Another aspect multiphoton absorption confine optical beam intensity.Gas ionization reduces the refractive index of medium
Thus leading to light beam to defocus.One obvious feature of silk is exactly its universality：No matter in solid, liquid or gas,
As long as photon energy arises that spinnbarkeit less than basic electron transfer energy.This shows to there may be one in inelastic region
The strong suction zone of individual Transmission dynamic.When center obstacle stops the propagation of light, still produce filament.In fact laser storage
Energy so that filamentation is regenerated, result filamentation is throughout the unfavorable atmospheric condition such as such as mist and rain.When laser energy be enough to
When in the air propagates certain distance, filament length degree can reach several meters, tens km, or even farther distance.Filamentation appear as electricity
The transfer of lotus provides passage, thus realize remote-wireless charging.
According to setting, the pulse frequency of femtosecond laser can be adjusted within the specific limits.Voltage arteries and veins on electric signal receiver
Rush that amplitude is high, this proposes very high requirement to the insulation of electric device, how by the potential pulse on electric signal receiver
Be transformed into the unidirectional current needed for user side or alternating current be technique bottleneck.
Content of the invention
In order to solve above-mentioned technical problem, the present invention proposes a kind of wireless power transmission method based on femtosecond laser and electric energy
Transmitting device, the voltage of the femtosecond filamentation of collection femtosecond laser that discharged using signal of telecommunication receiving electrode flashover, using resonance, filtering
Obtain DC voltage with rectification circuit it is achieved that the wireless power transmission of femtosecond laser.
In order to achieve the above object, the technical scheme is that：A kind of wireless power transmission dress based on femtosecond laser
Put, including femtosecond laser discharger, electrical signal emitter and high voltage power supply, femtosecond laser discharger and electrical signal emitter
It is connected, electrical signal emitter is connected with high voltage power supply it is characterised in that described femtosecond laser discharger and the signal of telecommunication are sent out
Light path between emitter is provided with signal of telecommunication receiving electrode, and signal of telecommunication receiving electrode is connected with electric signal receiver, the signal of telecommunication
Receptor is connected with resonance circuit, and resonance circuit is connected with non-contact transformer, non-contact transformer and rectification circuit phase
Connect, rectification circuit is connected with BUCK circuit, BUCK circuit and output resistanceR oIt is connected in parallel；Described femtosecond laser transmitting dress
Put and be connected with controller, controller is connected with the first wireless communication module；Described BUCK circuit is connected with drive circuit,
Drive circuit is connected with control circuit, control circuit respectively with the first current detection circuit, first voltage testing circuit, second
Current detection circuit, second voltage testing circuit and the second wireless communication module are connected, and the first current detection circuit is arranged on
One end of resonance circuit, first voltage testing circuit is arranged on the outfan of resonance circuit, and the second current detection circuit is arranged on
BUCK circuit and output resistanceR oBetween, second voltage testing circuit is arranged on the outfan of BUCK circuit, the second radio communication
Module is connected by wireless communication technology with the first wireless communication module.
Described resonance circuit includes electric capacityC 1, inductanceL 1, inductanceL 2And electric capacityC 2, electric capacityC 1It is connected in parallel on electric signal receiver two
End, electric capacityC 2It is connected in parallel on non-contact transformer two ends, inductanceL 1And inductanceL 2It is arranged on electric capacityC 1And electric capacityC 2Between, inductanceL 1With
InductanceL 2Mutual close-coupled simultaneously installs iron core additional.
It is parallel with electric capacity between described non-contact transformer and rectification circuitC S, non-contact transformer includes primary coil
InductanceL PInductance with secondary coilL S, inductanceL PWith inductanceL SLoose coupling mutually, inductanceL PWith electric capacityC 2It is connected in parallel, inductanceL SWith electric capacityC SIt is connected in parallel；Described rectification circuit includes four diodes of bridge-type connection.
Described first current detection circuit is arranged on inductanceL 1And inductanceL 2Between, first voltage testing circuit is arranged in parallel
In electric capacityC 2And inductanceL PBetween.
It is parallel with electric capacity between described rectification circuit and BUCK circuitC 3；Described BUCK circuit includes diode D1, diode
D2, switching tube V1, inductanceL 3, diode D2With electric capacityC 3It is connected in parallel, diode D2With electric capacityC 3Between be provided with switching tube V1, open
Close pipe V1On be parallel with diode D1, switching tube V1It is connected with drive circuit；The outfan of BUCK circuit is parallel with electric capacityC 4,
Electric capacityC 4With output resistanceR oIt is connected in parallel, inductanceL 3It is arranged on diode D2With electric capacityC 4Between.
Described second current detection circuit is arranged on diode D2With electric capacityC 4Between, second voltage testing circuit parallel connection sets
Put in electric capacityC 4Two ends.
Its wireless power transmission method is：
Step one：Controller controls femtosecond laser discharger to launch femto-second laser pulse to the signal of telecommunication powered by high voltage power supply
Emitter, in the process, femto-second laser pulse discharges to signal of telecommunication receiving electrode flashover, and electric signal receiver receives flashover and puts
The electric pulse of electricity obtains potential pulseu 1；
Step 2：Using resonance circuit（10）By potential pulseu 1In high-order harmonic filtering and generate self-oscillation and exchanged
Resonance potentialu P, non-contact transformer will exchange resonance potentialu PBy electromagnetic induction by primary coil inductanceL PIt is delivered to pair
The inductance of sideline circleL S, obtain exchanging resonance potentialu S；
Step 3：Exchange resonance potentialu SThe rectification of rectified circuit obtains DC voltageu 2；DC voltageu 2Through BUCK circuit fall
Pressure and filtering obtain DC voltageu o；
Step 4：First current detection circuit, first voltage testing circuit, the second current detection circuit, second voltage detection electricity
The current signal that road is detected respectively, voltage signal are sent to control circuit（14）, control circuit calculates input power respectively
And output；Control circuit controls the working condition of BUCK circuit breaker in middle pipe by drive circuit, adjusts PWM output signal
Dutycycle, control output size；Input power is sent to first by the second wireless communication module by control circuit
Wireless communication module, controller adjusts the pulse strength and the output energy that send femtosecond laser of femtosecond laser discharger, from
And make output resistanceR oObtain stable voltage.
Calculate frequency and the intensity of flashover electric discharge using the method for energy match, its control method is：Control circuit according to
The signal of change of the second current detection circuit and the detection of second voltage testing circuit goes out output voltageu oAnd output currenti oInstantaneously
Value, calculates outputP o(t)=u o i o；First current detection circuit, first voltage testing circuit detect resonance circuit respectively
The electric current of outfani pAnd voltageu p, control circuit is by output voltageu o, output currenti o, outputP o(t), voltageu pAnd electricity
Streami pInformation pass to controller via the second wireless communication module, the first wireless communication module；Controller judges output electricity
Pressureu oValue whether be less than limit value, when less than limit value, controller controls femtosecond laser discharger transmitting femtosecond laser
Pulse, realizes the electric discharge of emergency start flashover；Work as output voltageu oValue when being not less than limit value, controller voltageu pAnd electric currenti pPhase Diagram Analysis power consumption, ignore the effect of other energy-storage travelling wave tubes, the energy storage of non-contact transformer is：W E(t)=C p u p 2
(t)/2+L 1 i p 2(t)/2+L 2 i p 2(t)/2, then any two time pointt 1、t 2Energy storage difference be：
∆W E(t)=W E(t 1)-W E(t 2)
=[C p u p 2(t 1)/2+L 1 i p 2(t 1)/2+L 2 i p 2(t 1)/2]-[C p u p 2(t 2)/2+L 1 i p 2(t 2)/2+L 2 i p 2(t 2)/2],
The total input energy of circuitW in(t)=u o i o t/ƞ=W o(t) /ƞ；Calculate a flashover electric discharge using two above formula
The input energy providing is providedW in(t)=∆W E(t), the input energy that controller will calculateW inT () is set as femtosecond laser
The flashover strength of discharge of emitter, when flashover electric discharge startup timing then, controller start flashover electric discharge；Subsequently into
Cyclic program next time.
Beneficial effects of the present invention：Propagate the non-linear phenomena-filamentation of generation using femto-second laser pulse in atmosphere, electricity
Signal-receiving electrode flashover electric discharge in femto-second laser pulse, the potential pulse that flashover is discharged filters and is transformed into alternating current,
Carry out remote-wireless transmission of electricity using femto-second laser pulse；The peak-to-peak value of the alternating voltage after non-contact transformer coupling
Can be reduced to that original 1/tens are even lower, the insulation degree of late-class circuit can significantly reduce, and makes late-class circuit
Cost significantly reduces.Output voltage of the present invention is DC voltage, is available for many equipment and uses as power supply；Can be solved some special
Need for electricity under different situation, such as telecommunication satellite wireless power transmission, high speed electric automobile power source etc..
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, acceptable
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the structural representation based on the wireless electric energy transmission device of femtosecond laser for the present invention.
Fig. 2 is the simulation waveform of the present invention.
Fig. 3 is the experimental waveform of the present invention.
Fig. 4 is the voltage of the resonance circuit of the present inventionu PAnd electric currenti PPhasor.
Fig. 5 is the flow chart of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation description is it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of not paying creative work
Embodiment, broadly falls into the scope of protection of the invention.
A kind of wireless power transmission method based on femtosecond laser and power transfer, the principle using femtosecond laser is：Fly
Second laser is propagated in atmosphere, on the one hand has optical Kerr effect, offsets diffraction and according to focus on light beam itself；The opposing party
Face has multiphoton absorption confine optical beam intensity.Gas ionization reduces the refractive index of medium thus leading to light beam to defocus, thus
Lead to be in thread propagation in atmosphere, electric charge can be propagated along silk.Femtosecond laser filamentation is actually one by peak power
Density exceedes the nonlinear propagation area that the femtosecond laser of certain value causes, the self-focusing that Kerr effect causes, multiphoton ionization and
The femtosecond laser that leads to of diffraction defocuses, and both reach balance and are the formation of self-aiming light pulse, and self-aiming light pulse is very long
Propagated with very high peak power density in distance range, here it is our described filamentation, these self-aiming pulses pass in gas
Broadcast region and create a weakly ionized plasma post, this is that provide can for the transmission that this weakly ionized plasma post is electric charge
Energy.
Even if femtosecond laser is propagated in a vacuum, always there is diffraction in light beam.First-order theory law is thought and is worked as beam propagation
When exceeding Rayleigh range, Gaussian beam space phase increases the factor, Rayleigh range is defined as：
（1）；
Wherein,ω 0It is with a tight waist,λ 0For laser wavelength in a vacuum,n 0For medium respective wavelength refractive index,k=n 0 k 0,k 0 =
2π/λ 0It is respectively the wave number in medium and vacuum.
Gas, liquid and transparent solid are all dispersive mediums.In positive dispersion area, HONGGUANG is faster than what blue light was propagated, and this just anticipates
After taste propagation one segment distance, HONGGUANG occurs in the front end of pulse envelope, and blue light occurs in rear end, just makes pulse widening, peak value
Power reduction, this effect, GVD, uses dispersion length（LGVD）Represent position：
（2）.
Wherein,t pFor pulsewidth,k"=∂2 k/∂ω 2|ω 0For wave numberk(ω) in mid frequencyω 0Secondary term system in expansion
Number, wave numberk(ω) series expansion is：
.
Wherein, c is the light velocity in vacuum,For frequency of light wave, k ' is the first derivative of k.The refractive index of airnIn electromagnetism
Depend not only on its frequency in, also depend on refractive indexn=n 0+n 2∙IDetermine the energy of room and time in (r, t)I
(r,t).Non-linear Kerr coefficientn 2With 3 rank susceptibilityχ (3)=4ε 0∙c∙n 2∙n 0 2/ 3 is relevant, wherein,ε 0Normal for the dielectric in vacuum
Number, coefficientn 2Often negative.When pulsed irradiation causes refractive index to increase, monochromatic light is discussed first（Or continuous light）, now
Laser intensity does not change over.
On axle, the intensity of light beam is typically strong, and beam center wavefront twisted effect is just similar to lens, with
The accumulation of various different effect, in the case of not having other saturation effects, leads to light beam to sexually revise according to generation disaster itself.
Characteristic length LSF of self-focusing is defined as exceeding the length of nonlinear phase accumulation, can be with integration
Measurement, I is femtosecond laser light intensity, and z is length.Self-focusing characteristic length can be expressed as the function of peak power：
（3）
Wherein, I0For incident femtosecond laser peak light intensity, simply enter powerP inExceed threshold limit value, self-focusing will overcome diffraction
Lead to compress：
（4）
There is self-focusing spread length during compression in light beamL cCan be obtained approximate well by semiempirical formula：
（5）
Wherein,L DFIt is the Rayleigh range of light beam,L cWithL DFEqually, with spot diameter square and change；PcrFor there is autohemagglutination
Critical work(when burnt.
Filamentation requires approximately loss-free Ke Er area, and Ke Er area is defocused by multiphoton absorption and plasma and causes.
For the generation of spinnbarkeit, the energy that laser photon experiences filamentation is gas ionization potentialU iSmall part, this is
Very necessary.WhenWhen, impulse attenuation（Due to two-photon and Three-photon absorption）Very serious, so that it is very narrow to produce one
Filament；WhenWhen, wavelength is that the laser of 800 nm is propagated in atmosphere,=1.5 eV, oxygen ionizes potentialU i～12
EV, so first is ionized.Medium ionization requires close in a large numberPhoton excited absorption, this is in low power density
It is impossible.But when light beam close to cave in when, pulse strength sharply increases, and ionization is possibly realized.Due to ionizing probability
Depend strongly on the intensity of light, so ionization is very unexpected.Photon ionization or light FI all include multi-photon area and Close Tunnel.
Femtosecond laser filamentation be actually one by the femtosecond laser that peak power density exceedes certain value cause non-
The femtosecond laser that leads to of linear propagation area, the self-focusing that Kerr effect causes, multiphoton ionization and diffraction defocuses, and both reach flat
Weighing apparatus is the formation of self-aiming light pulse, and self-aiming light pulse is passed with very high peak power density in very long distance range
Broadcast, here it is our described filamentation, these self-aiming pulses create a weakly ionized plasma post in gas propagation regions, this
It is that the transmission that this weakly ionized plasma post is electric charge provides possibility.
A kind of wireless electric energy transmission device based on femtosecond laser, including femtosecond laser discharger 1, electrical signal emitter
5 and high voltage power supply 6, femtosecond laser discharger 1 is connected with electrical signal emitter 5, electrical signal emitter 5 and high voltage power supply 6
It is connected, the light path between described femtosecond laser discharger 1 and electrical signal emitter 5 is provided with signal of telecommunication receiving electrode 41,
Signal of telecommunication receiving electrode 41 is connected with electric signal receiver 4, and electric signal receiver 4 is connected with resonance circuit 10, resonance electricity
Road 10 is connected with non-contact transformer 7, and non-contact transformer 7 is connected with rectification circuit 8, rectification circuit 8 and BUCK circuit 9
It is connected, BUCK circuit 9 and output resistanceR oIt is connected in parallel；Described femtosecond laser discharger 1 is connected with controller 2, control
Device 2 processed is connected with the first wireless communication module 3；Described BUCK circuit 9 is connected with drive circuit 13, drive circuit 13 and control
Circuit 14 processed is connected, control circuit 14 respectively with the first current detection circuit 11, first voltage testing circuit 12, the second electric current
Testing circuit 15, second voltage testing circuit 16 are connected with the second wireless communication module 17, and the first current detection circuit 11 sets
Put the one end in resonance circuit 10, first voltage testing circuit 12 is arranged on the outfan of resonance circuit 10, the second current detecting
Circuit 15 is arranged on BUCK circuit 9 and output resistanceR oBetween, second voltage testing circuit 16 is arranged on the output of BUCK circuit 9
End, the second wireless communication module 17 is connected by wireless communication technology with the first wireless communication module 3.
Resonance circuit 10 includes electric capacityC 1, inductanceL 1, inductanceL 2And electric capacityC 2, electric capacityC 1It is connected in parallel on 4 liang of electric signal receiver
End, electric capacityC 2It is connected in parallel on non-contact transformer 7 two ends, inductanceL 1And inductanceL 2It is arranged on electric capacityC 1And electric capacityC 2Between, inductanceL 1
And inductanceL 2Mutual close-coupled simultaneously installs iron core additional.
It is parallel with electric capacity between non-contact transformer 7 and rectification circuit 8C S, non-contact transformer 7 includes primary coil
InductanceL PInductance with secondary coilL S, inductanceL PWith inductanceL SLoose coupling mutually, inductanceL PWith electric capacityC 2It is connected in parallel, inductanceL SWith electric capacityC SIt is connected in parallel；Described rectification circuit 8 includes four diodes of bridge-type connection.First current detection circuit 11 sets
Put in inductanceL 1And inductanceL 2Between, first voltage testing circuit 12 is arranged in parallel in electric capacityC 2And inductanceL PBetween.
It is parallel with electric capacity between rectification circuit 8 and BUCK circuit 9C 3；Described BUCK circuit 9 includes diode D1, diode
D2, switching tube V1, inductanceL 3, diode D2With electric capacityC 3It is connected in parallel, diode D2With electric capacityC 3Between be provided with switching tube V1, open
Close pipe V1On be parallel with diode D1, switching tube V1It is connected with drive circuit 13；The outfan of BUCK circuit 9 is parallel with electric capacityC 4, electric capacityC 4With output resistanceR oIt is connected in parallel, inductanceL 3It is arranged on diode D2With electric capacityC 4Between.Second current detection circuit
15 are arranged on diode D2With electric capacityC 4Between, second voltage testing circuit 16 is arranged in parallel in electric capacityC 4Two ends.
A kind of wireless power transmission method of the wireless electric energy transmission device based on femtosecond laser is：
Step one：Controller 2 controls femtosecond laser discharger 1 to launch femto-second laser pulse to the electricity powered by high voltage power supply 6
Signal projector 5, in the process, femto-second laser pulse discharges to signal of telecommunication receiving electrode 41 flashover, and electric signal receiver 4 connects
The electric pulse receiving flashover electric discharge obtains potential pulseu 1.
The pulse signal power of femtosecond laser transmission can set, and opens femtosecond laser transmitting in the presence of controller 2
Device 1, can obtain the potential pulse of several kV ~ thousand of kV, its moment impact electric current on electric signal receiver 4 by flashover electric discharge
Up to several kA.
Step 2：Using resonance circuit（10）By potential pulseu 1In high-order harmonic filtering and generate self-oscillation and obtain
Exchange resonance potentialu P, non-contact transformer 7 will exchange resonance potentialu PBy electromagnetic induction by primary coil inductanceL PTransmission
Inductance to secondary coilL S, obtain exchanging resonance potentialu S.
Because flashover electric discharge obtains potential pulseu 1Magnitude of voltage is higher, harmonic componentss are larger, using in resonance circuit 10
Electric capacityC 1Filtering eliminates the spike of potential pulse；Then by the inductance being closely coupled to each otherL 1, inductanceL 2, electric capacityC 2, inductanceL P
Resonance obtains exchanging resonance potentialu P, exchange resonance potentialu PResonant frequency depend on inductanceL 1, inductanceL 2, electric capacityC 2, inductanceL P, inductanceL S, electric capacityC SAnd the resistance that following stage is equivalent.The inductance of the secondary coil in non-contact transformer 7L SBy electromagnetism sense
The inductance of primary coil should be obtainedL PThe energy of transmission simultaneously converts it into exchange resonance potentialu S.Exchange resonance potentialu SThrough humorous
The inductance coil coupling of the circuit 10 that shakes filtering and non-contact transformer 7, it is even lower that peak value is reduced to original 1/tens,
Then the insulation degree of late-class circuit can significantly reduce, and so that the cost of late-class circuit is significantly reduced.
Different according to the distance of laser power transmission, the attenuation degree of the laser signal that electric signal receiver 4 receives is also
Difference, the potential pulse peak value of conversion also can accordingly change therewith.When electric capacity in parallel on electric signal receiver 4C 1Two ends occur
During high voltage pulse, electric capacityC 1The instantaneous voltage at two ends can not be mutated, and this is extremely important for suppression crest voltage.And and electric capacityC 1The inductance being connectedL 1And inductanceL 2The electric current at two ends instantaneously can not be mutated, and the magnetic flux of two inductance generations is cancelled out each other, electric capacityC 2The instantaneous voltage at two ends nor mutation, therefore in electric capacityC 2Two ends obtain the exchange resonance potential of approximate sine waveu P.Exchange
Resonance potentialu PFrequency can be adjusted according to the laser frequency of femtosecond laser transmitting, the circuit of the present invention employ 500Hz's
Laser beam, exchanges resonance potentialu PFrequency be 1kHz.
Step 3：Exchange resonance potentialu SThe rectification of rectified circuit 8 obtains DC voltageu 2；DC voltageu 2Through BUCK
Circuit 9 blood pressure lowering and filtering obtain DC voltageu o；Exchange resonance potentialu SThe rectified device of voltage 8 rectification, electric capacityC 3Filtering obtains straight
Stream voltageu 2, voltage after filteringu 2For Rectified alternating current, so that rear class converts it into galvanic current pressure further.
DC voltageu 2Through BUCK circuit 9 blood pressure lowering, inductanceL 3And electric capacityC 4Filtering obtains DC voltageu o.
Step 4：First current detection circuit 11, first voltage testing circuit 12, the second current detection circuit 15, second
The current signal that voltage detecting circuit 16 is detected respectively, voltage signal are sent to control circuit 14, and control circuit 14 is respectively
Calculate input power and output；Control circuit 14 controls the work shape of BUCK circuit 9 breaker in middle pipe by drive circuit 13
State, adjusts the dutycycle of PWM output signal, controls the size of output；Control circuit 14 passes through the second wireless communication module
Input power is sent to the first wireless communication module 3 by 17, and the femtosecond that sends that controller 2 adjusts femtosecond laser discharger 1 swashs
The pulse strength of light and output energy, so that output resistanceR oObtain stable voltage.
Control circuit 14 obtains non-contact transformer 7 and output resistanceR oCalculate defeated after the current signal at place, voltage signal
Enter power and output, after comprehensive descision, send feedback control signal to drive circuit 13 or the second wireless communication module 17,
Thus controlling the size of output.
The major parameter in circuit in the present invention is as shown in table 1.Potential pulse in circuit of the present inventionu 1, exchange resonance electricity
Pressureu P, exchange resonance potentialu SDC voltage with outputu oSimulation waveform as shown in Fig. 2 electric signal receiver 4 receive flashover
The electric pulse of electric discharge obtains potential pulseu 1Experimental waveform as shown in Figure 3.Above-mentioned point can be verified by the result of Fig. 2 and Fig. 3
The correctness of analysis.
Table 1 experimental system major parameter
| Parameter | Numerical value | Parameter | Numerical value |
| Electric capacityC 1 | 0.01 μF | InductanceL S | 20 mH |
| Electric capacityC 2 | 2 μF | Electric capacityC 3 | 10 μH |
| InductanceL 1 | 10 mH | Electric capacityC 4 | 1000 μH |
| InductanceL 2 | 10 mH | Voltageu 1 | 100 kV pulses |
| InductanceL 3 | 10 mH | Voltageu o | 310 V direct currents |
| InductanceL P | 20 mH | BUCK circuitf V | 25 kHz |
The energy that femtosecond laser provides belongs to pulse Charge Source property, the exchange resonance potential that its energy changes intou PIt is from exciting
Swing voltage, its voltage magnitude progressively reduces with energy attenuation, shake until next flashover discharge pulse arrives just to refill
Swing energy, voltage magnitude also can rise.Late-class circuit processes exchange resonance potentialu PObtain galvanic current pressureu o, it is
Stable DC voltageu o, in circuit end, electric capacity is setC 4As Large Copacity energy-storage travelling wave tube it is contemplated that electric capacityC 4Capacity have
Limit, when unbalanced supply-demand, its terminal voltage has fluctuation, in order to ensure fluctuation range in allowed limits（Within ± 5%）, right
The balance of supply and demand energy needs to be accurately controlled in real time method.It is not both with other kinds of power supply, feedback control of the present invention
To as if femto-second laser pulse midway to signal of telecommunication receiving electrode 41 flashover electric discharge the quantity of electric charge and femto-second laser pulse send out
Radio frequency rate（Mainly control the quantity of electric charge, uncomfortable whole tranmitting frequency when load variations are little）.The quantity of electric charge of flashover electric discharge is by femtosecond
The voltage of the intensity of laser pulse and high voltage power supply 6 determines.
Realize accurate Charge controlled must analyze flashover discharge pulse first and exchange resonance potentialu PAnd electric currenti P's
Relation.Exchange resonance potentialu PAnd electric currenti PPhasor schematic diagram as shown in Figure 4.As shown in Figure 4, there is no flashover electric discharge arteries and veins
When rushing, voltageu PWith electric currenti PVibration attenuation trend annular in shape, until next flashover discharge pulse arrive, the dynamic point of phasor
It is displaced outwardly rapidly；When flashover discharge pulse terminates, exchange resonance potentialu PWith electric currenti PVibration again attenuation trend annular in shape,
The size of anchor ring i.e. depend on electric charge number, again depend on load size.
In exchange resonance potentialu PAnd electric currenti PPhasor from voltageu PA zero crossing run to another zero crossing
When, its run time was 1/2 cycle of oscillation, and this cycle is divided as 30 sampled points, the then voltage x current of each sample point
Value is compared with the result of the same sampled point of a upper cycle of oscillation, if its voltage x current value was more than a upper cycle of oscillation
Same sampled point result, show to occur in that during this period that flashover discharges, otherwise then show to vibrate attenuation trend annular in shape.From
Dynamic pointMove to dynamic pointWhen flashover electric discharge does not occur, energy progressively decays, and phasor moves in interior side ring surface；Driven
PointMove to dynamic pointWhen flashover electric discharge occurs, phasor moves to outer side ring surface from interior side ring surface；From dynamic pointTo dynamic pointMove
When dynamic, when flashover electric discharge does not occur, phasor moves in outer side ring surface；Progressively weaken phasor with resonant energy gradually along ring
Towards medial motion.
Judgement for the energy size of flashover electric discharge adopts exchange resonance potentialu PAnd electric currenti PPhasor analyzing and to count
Calculate.Can be seen that with Fig. 4 from Fig. 1, Fig. 2 and exchange resonance potentialu PAnd electric currenti PPhasor often run a circle and represent and shake through one
Swing the cycle.Ignore the effect of part energy-storage travelling wave tube, the energy storage of non-contact transformer 7 isW E(t)=C p u p 2(t)/2 +L 1 i p 2(t)/
2+L 2 i p 2(t)/2, export energyW o(t)=u o i o t/ƞ, wherein,tExpress time,ƞRepresent efficiency.Occur when there is no flashover electric discharge
When, each cycle of oscillation exchanges resonance potentialu PAnd electric currenti PPeak value all can decay, the DC voltage of outputu oAlso can subtract
Few.Due to circuit hysteresis effect at different levels, the energy demand of flashover electric discharge is in DC voltageu oWhen not being reduced to pre-determined lower limit
Just occur in advance, its energy injection is reported as precisely as possible with consumption to be mated.
The present invention adopts the method for energy match to calculate frequency and the intensity of flashover electric discharge, and its control method is：Control electricity
Road 14 goes out output voltage according to the signal of change of the second current detection circuit 15 and second voltage testing circuit 16 detectionu oWith defeated
Go out electric currenti oInstantaneous value, calculates outputP o(t)=u o i o；First current detection circuit 11, first voltage testing circuit 12
Detect the electric current of resonance circuit 10 outfan respectivelyi pAnd voltageu p, control circuit 14 is by output voltageu o, output currenti o, defeated
Go out powerP o(t), voltageu pAnd electric currenti pInformation pass to via the second wireless communication module 17, the first wireless communication module 3
Controller 2；Controller 2 judges output voltageu oValue whether be less than limit value, when less than limit value, controller 2 controls and flies
Second laser beam emitting device 1 transmitting femto-second laser pulse, realizes the electric discharge of emergency start flashover；Work as output voltageu oValue be not less than limit
During definite value, voltage used by controller 2u pAnd electric currenti pPhase Diagram Analysis power consumption, ignore the effect of other energy-storage travelling wave tubes, noncontact
The energy storage of transformator 7 is：W E(t)=C p u p 2(t)/2+L 1 i p 2(t)/2+L 2 i p 2(t)/2, then any two time pointt 1、t 2Storage
Can difference be：
∆W E(t)=W E(t 1)-W E(t 2)
=[C p u p 2(t 1)/2+L 1 i p 2(t 1)/2+L 2 i p 2(t 1)/2]-[C p u p 2(t 2)/2+L 1 i p 2(t 2)/2+L 2 i p 2(t 2)/2],
The total input energy of circuitW in(t)=u o i o t/ƞ=W o(t) /ƞ；Calculate a flashover electric discharge using two above formula
The input energy providing is providedW in(t)=∆W E(t), the input energy that controller 2 will calculateW inT () is set as femtosecond laser
The flashover strength of discharge of emitter 1, when flashover electric discharge startup timing then, controller 2 start flashover electric discharge；Then enter
Enter cyclic program next time.
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto,
Any those familiar with the art the invention discloses technical scope in, the change or replacement that can readily occur in,
All should be included within the scope of the present invention.
Claims (8)
1. a kind of wireless electric energy transmission device based on femtosecond laser, including femtosecond laser discharger（1）, electrical signal emitter
（5）And high voltage power supply（6）, femtosecond laser discharger（1）And electrical signal emitter（5）It is connected, electrical signal emitter（5）With
High voltage power supply（6）It is connected it is characterised in that described femtosecond laser discharger（1）And electrical signal emitter（5）Between light
Road is provided with signal of telecommunication receiving electrode（41）, signal of telecommunication receiving electrode（41）With electric signal receiver（4）It is connected, the signal of telecommunication connects
Receive device（4）With resonance circuit（10）It is connected, resonance circuit（10）With non-contact transformer（7）It is connected, non-contact transformer
（7）With rectification circuit（8）It is connected, rectification circuit（8）With BUCK circuit（9）It is connected, BUCK circuit（9）With output resistanceR o
It is connected in parallel；Described femtosecond laser discharger（1）With controller（2）It is connected, controller（2）With the first wireless communication module
（3）It is connected；Described BUCK circuit（9）With drive circuit（13）It is connected, drive circuit（13）With control circuit（14）It is connected
Connect, control circuit（14）Respectively with the first current detection circuit（11）, first voltage testing circuit（12）, second current detecting electricity
Road（15）, second voltage testing circuit（16）With the second wireless communication module（17）It is connected, the first current detection circuit（11）
It is arranged on resonance circuit（10）One end, first voltage testing circuit（12）It is arranged on resonance circuit（10）Outfan, second
Current detection circuit（15）It is arranged on BUCK circuit（9）With output resistanceR oBetween, second voltage testing circuit（16）It is arranged on
BUCK circuit（9）Outfan, the second wireless communication module（17）With the first wireless communication module（3）By wireless communication technology
It is connected.
2. the wireless electric energy transmission device based on femtosecond laser according to claim 1 is it is characterised in that described resonance is electric
Road（10）Including electric capacityC 1, inductanceL 1, inductanceL 2And electric capacityC 2, electric capacityC 1It is connected in parallel on electric signal receiver（4）Two ends, electric capacityC 2And
It is associated in non-contact transformer（7）Two ends, inductanceL 1And inductanceL 2It is arranged on electric capacityC 1And electric capacityC 2Between, inductanceL 1And inductanceL 2Mutually
Phase close-coupled simultaneously installs iron core additional.
3. the wireless electric energy transmission device based on femtosecond laser according to claim 2 is it is characterised in that described noncontact
Transformator（7）With rectification circuit（8）Between be parallel with electric capacityC S, non-contact transformer（7）Inductance including primary coilL PAnd pair
The inductance of sideline circleL S, inductanceL PWith inductanceL SLoose coupling mutually, inductanceL PWith electric capacityC 2It is connected in parallel, inductanceL SWith electric capacityC S
It is connected in parallel；Described rectification circuit（8）Four diodes connecting including bridge-type.
4. the wireless electric energy transmission device based on femtosecond laser according to claim 3 is it is characterised in that described first is electric
Current detection circuit（11）It is arranged on inductanceL 1And inductanceL 2Between, first voltage testing circuit（12）It is arranged in parallel in electric capacityC 2With
InductanceL PBetween.
5. the wireless electric energy transmission device based on femtosecond laser according to claim 1 is it is characterised in that described rectified current
Road（8）With BUCK circuit（9）Between be parallel with electric capacityC 3；Described BUCK circuit（9）Including diode D1, diode D2, switching tube
V1, inductanceL 3, diode D2With electric capacityC 3It is connected in parallel, diode D2With electric capacityC 3Between be provided with switching tube V1, switching tube V1On simultaneously
It is associated with diode D1, switching tube V1With drive circuit（13）It is connected；BUCK circuit（9）Outfan be parallel with electric capacityC 4, electric capacityC 4With output resistanceR oIt is connected in parallel, inductanceL 3It is arranged on diode D2With electric capacityC 4Between.
6. the wireless electric energy transmission device based on femtosecond laser according to claim 5 is it is characterised in that described second is electric
Current detection circuit（15）It is arranged on diode D2With electric capacityC 4Between, second voltage testing circuit（16）It is arranged in parallel in electric capacityC 4
Two ends.
7. a kind of wireless electric energy transmission device based on femtosecond laser according to claim 1 is it is characterised in that it is wireless
Electric power distribution is：
Step one：Controller（2）Control femtosecond laser discharger（1）Transmitting femto-second laser pulse is given by high voltage power supply（6）For
The electrical signal emitter of electricity（5）, in the process, femto-second laser pulse is to signal of telecommunication receiving electrode（41）Flashover discharges, telecommunications
Number receptor（4）The electric pulse receiving flashover electric discharge obtains potential pulseu 1；
Step 2：Using resonance circuit（10）By potential pulseu 1In high-order harmonic filtering generate self-oscillation obtain exchanging humorous
Shake voltageu P, non-contact transformer（7）Resonance potential will be exchangedu PBy electromagnetic induction by primary coil inductanceL PIt is delivered to pair
The inductance of sideline circleL S, obtain exchanging resonance potentialu S；
Step 3：Exchange resonance potentialu SRectified circuit（8）Rectification obtain DC voltageu 2；DC voltageu 2Through BUCK electricity
Road（9）Blood pressure lowering and filtering obtain DC voltageu o；
Step 4：First current detection circuit（11）, first voltage testing circuit（12）, the second current detection circuit（15）,
Two voltage detecting circuits（16）The current signal being detected respectively, voltage signal are sent to control circuit（14）, control circuit
（14）Calculate input power and output respectively；Control circuit（14）By drive circuit（13）Control BUCK circuit（9）In
The working condition of switching tube, adjusts the dutycycle of PWM output signal, controls the size of output；Control circuit（14）Pass through
Second wireless communication module（17）Input power is sent to the first wireless communication module（3）, controller（2）Adjust femtosecond laser
Discharger（1）The pulse strength and the output energy that send femtosecond laser so that output resistanceR oObtain stable voltage.
8. a kind of wireless power transmission method based on femtosecond laser according to claim 7 and power transfer, its feature
It is, calculate frequency and the intensity of flashover electric discharge using the method for energy match, its control method is：Control circuit（14）According to
Second current detection circuit（15）With second voltage testing circuit（16）The signal of change of detection goes out output voltageu oWith output electricity
Streami oInstantaneous value, calculates outputP o(t)=u o i o ；First current detection circuit（11）, first voltage testing circuit（12）
Detect resonance circuit respectively（10）The electric current of outfani pAnd voltageu p, control circuit（14）By output voltageu o, output currenti o, outputP o(t), voltageu pAnd electric currenti pInformation via the second wireless communication module（17）, the first wireless communication module
（3）Pass to controller（2）；Controller（2）Judge output voltageu oValue whether be less than limit value, when less than limit value,
Controller（2）Control femtosecond laser discharger（1）Transmitting femto-second laser pulse, realizes the electric discharge of emergency start flashover；Work as output
Voltageu oValue when being not less than limit value, controller（2）Use voltageu pAnd electric currenti pPhase Diagram Analysis power consumption, ignore other
The effect of energy-storage travelling wave tube, non-contact transformer（7）Energy storage be：W E(t)=C p u p 2(t)/2+L 1 i p 2(t)/2+L 2 i p 2(t)/2,
Then any two time pointt 1、t 2Energy storage difference be：
∆W E(t)=W E(t 1)-W E(t 2)
=[C p u p 2(t 1)/2+L 1 i p 2(t 1)/2+L 2 i p 2(t 1)/2]-[C p u p 2(t 2)/2+L 1 i p 2(t 2)/2+L 2 i p 2(t 2)/2],
The total input energy of circuitW in(t)=u o i o t/ƞ=W o (t) /ƞ；Calculating a flashover electric discharge using two above formula needs
Input energy to be providedW in(t)=∆W E(t), controller（2）The input energy that will calculateW inT () is set as femtosecond laser
Emitter（1）Flashover strength of discharge, when flashover electric discharge startup timing then, controller（2）Start flashover electric discharge；So
After enter cyclic program next time.
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| CN112084621A (en) * | 2020-07-27 | 2020-12-15 | 北京空间机电研究所 | Method, medium and equipment for long-distance transmission simulation of optical fiber laser |
| CN113341708A (en) * | 2021-05-14 | 2021-09-03 | 华中科技大学 | Method and system for measuring plasma parameters of femtosecond laser induced gas ionization |
| CN114884232A (en) * | 2022-07-12 | 2022-08-09 | 合肥有感科技有限责任公司 | Wireless power transmission system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112084621A (en) * | 2020-07-27 | 2020-12-15 | 北京空间机电研究所 | Method, medium and equipment for long-distance transmission simulation of optical fiber laser |
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| CN113341708A (en) * | 2021-05-14 | 2021-09-03 | 华中科技大学 | Method and system for measuring plasma parameters of femtosecond laser induced gas ionization |
| CN113341708B (en) * | 2021-05-14 | 2022-05-20 | 华中科技大学 | Method and system for measuring plasma parameters of femtosecond laser induced gas ionization |
| CN114884232A (en) * | 2022-07-12 | 2022-08-09 | 合肥有感科技有限责任公司 | Wireless power transmission system |
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