CN105226839B - Magnet coupled resonant type wireless electric energy transmission system and its bilateral self-tuning method - Google Patents
Magnet coupled resonant type wireless electric energy transmission system and its bilateral self-tuning method Download PDFInfo
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Abstract
The invention discloses a kind of magnet coupled resonant type wireless electric energy transmission system and its bilateral self-tuning methods, the system includes at least being sequentially connected electrically the launching circuit formed by high frequency electric source, first port, emitting side resonant capacitance, transmitting coil and is at least sequentially connected electrically the reception circuit formed by receiving coil, receiving side resonant capacitance, second port, load, it is connected between the transmitting coil and receiving coil by magnetic coupling, increases an impedance adjusting network between the rear end of first port and the front end of emitting side resonant capacitance in the launching circuit.The present invention realizes that launching circuit tunes automatically by increasing an impedance adjusting network in launching circuit；It need not increase additional impedance adjusting network in circuit is received, be adjusted merely by transmitting terminal power work frequency and to realize that receive circuit tunes automatically indirectly, greatly reduce the complexity, energy loss and control difficulty of receiving terminal circuit.
Description
Technical field
The invention belongs to wireless power transmission fields, and in particular to a kind of magnet coupled resonant type wireless electric energy transmission system and
Its bilateral self-tuning method.
Background technology
Wireless power transmission method allows to transmit electric energy without using conducting wire, in electrified traffic, mobile terminal device, machine
The fields such as device people, Internet of Things, medicine have broad application prospects.Generally speaking, wireless power transmission method can be divided into radiation
Two class of formula and non-radiative formula.Radiant type wireless power transmission method transmits energy, it can be achieved that remote by emitting electromagnetic wave
Transmission, but energy transmission efficiency is relatively low, and powerful electromagnetic energy is radiated the health that people can be also endangered in environment in addition, therefore
The application scenario of radiant type wireless power transmission method is limited；Non-radiative formula wireless power transmission method include inductive coupling type,
Magnet coupled resonant type, field coupling formula are several.Wherein, magnet coupled resonant type wireless method of electric energy transfer has short-distance and medium-distance, height
The advantages such as efficiency, safety be good, in recent years as research hotspot, this method is in electric vehicle, mobile electronic device, implanted
The fields such as medical devices obtain certain application.
Highest transmission effect must could be obtained in resonance using the system of magnet coupled resonant type wireless method of electric energy transfer
Rate, in engineering in practice, cause system it is detuning shake/impedance lost there are many matched factors：Wireless charging such as is being carried out to mobile phone
When, manually change the relative position between mobile phone and charger；When carrying out wireless charging to electric vehicle, due to charger
It is not aligned strictly with the reception device on automobile domain；For another example the temperature change of working environment leads to charger with receiving
EMR electromagnetic resonance frequency shifts of device etc..Such as Yi Shang reason all may cause system is detuning to shake.Correlative study shows
Unified denier off-resonance state, energy transmission efficiency will drastically reduce, and when system is completely detuning, efficiency of transmission is almost
Zero, under powerful application scenario, system is detuning to shake/and impedance loses matching and also results in circuit becomes extremely unstable, due to just
It is obstructed to transimission power, reflection power is very big, may cause equipment damage.For this purpose, the transmitting of the system of realization, reception circuit bilateral are certainly
Dynamic tuning is particularly significant.
Under the application scenario of many wireless power transmissions, due to limitations such as terminal device volume, weight, it is difficult to receive
Increase additional circuit in circuit to be tuned automatically；It such as receives circuit and can not achieve automatic tuning, and whole system can be reduced
Wireless power transmission efficiency.Therefore, how to realize system launching circuit, receive the tuning of circuit two-side automation, and as simple as possible
Change the circuit structure of reception device, be that there is an urgent need in the art to one of key technologies of solution.
Invention content
A kind of magnet coupled resonant type wireless electric energy transmission is provided the purpose of the present invention is to solve above-mentioned technical problem
System and its bilateral self-tuning method enable the system to the parameter values such as Adaptive Transmission distance, circuit parasitic parameter, load impedance
Launching circuit is adjusted to resonant condition with receiving circuit, obtains highest wireless power transmission efficiency by variation simultaneously.
Technical problem solved by the invention is realized using following technical scheme：
The bilateral self-tuning method of magnet coupled resonant type wireless electric energy transmission system provided by the invention, the system are included extremely
It is few be sequentially connected electrically by high frequency electric source, first port, emitting side resonant capacitance, transmitting coil the launching circuit that forms and at least by
Receiving coil, receiving side resonant capacitance, second port, load are sequentially connected electrically the reception circuit of composition, the transmitting coil with
It is connected between receiving coil by magnetic coupling, the rear end of first port and emitting side resonant capacitance in the launching circuit
Front end between increase an impedance adjusting network, then carry out according to the following steps：
Step 1., which first tunes, receives circuit：Power work frequencies omega is adjusted, until the impedance for receiving circuit meets Im (Zout+
ZL)=0, Zout、ZLOutput impedance and load impedance respectively at second port receive circuit and purely resistive are presented, at this time by this
When power work frequency be denoted as ω0；
Step 2. retunes launching circuit：It is ω to make power work frequency perseverance0, adjust the impedance of the impedance adjusting network
Parameter value, until the impedance of launching circuit meets Im (Zin+ZS)=0, and Re (Zin)=Re (ZS), Zin、ZSRespectively first end
Input impedance and the internal resistance of source at mouthful, purely resistive is presented in launching circuit at this time, and output power of power supply is maximum；
Step 3. repeats step 1, step 2, until the impedance for detecting obtained launching circuit meets | Im (Zin+ZS)|<A, |
Re(Zin)-Re(ZS)|<B, the impedance for receiving circuit meet | Im (Zin+ZS)|<C, a, b, c are the threshold value of setting.
Magnet coupled resonant type wireless electric energy transmission system provided by the invention, including at least by high frequency electric source, first port,
Emitting side resonant capacitance, transmitting coil are sequentially connected electrically the launching circuit of composition and at least by receiving coil, receiving side resonance electricity
Appearance, second port, load are sequentially connected electrically the reception circuit of composition, pass through magnetic field coupling between the transmitting coil and receiving coil
Conjunction is connected；Lead in the launching circuit equipped with directional coupler detection module, the first control module, program-controlled voltage source, first
Believe module and by variable capacitance C1, variable capacitance C2, variable inductance L1The π type impedance adjusting networks of composition, the orientation coupling
Clutch detection module is connected in launching circuit at first port, the directional coupler detection module, program-controlled voltage source, first
Communication module is electrically connected respectively with the first control module, the variable capacitance C1, variable capacitance C2, variable inductance L1Respectively with journey
Control voltage source electrical connection；Current detection module, voltage detection module, phase discriminator, the second control are equipped in the reception circuit
Module and second communication module, the current detection module, which is connected on, to be received in circuit at second port, the voltage detecting mould
Block, which is connected in parallel on, to be received in circuit at second port, and the current detection module, voltage detection module are electrically connected respectively with phase discriminator
It connects, the phase discriminator, second communication module are electrically connected respectively with the second control module.
The directional coupler detection module is used to detect the reflectance factor in launching circuit at first port and be input to
In first control module；The first communication module is used to obtain receiving electric current, the voltage phase difference in circuit at second port
Information is simultaneously inputted in the first control module；First control module for processing detection to reflectance factor, phase information simultaneously
Control the output frequency of high frequency electric source and the output voltage of programmable power supply so that reflectance factor is 0 at first port, second port
It is 0 to locate Current Voltage phase difference；The program-controlled voltage source is used to adjust variable capacitance C1, variable capacitance C2, variable inductance L1's
Value, so as to adjust the input impedance in launching circuit at first port；The current detection module, voltage detection module are used respectively
Electric current in circuit at second port, voltage are received in detection and are sent in phase discriminator；The phase discriminator is used to obtain
Above-mentioned electric current, voltage signal phase difference and be sent in the second control module；Second control module is used for processing detection
The phase information that arrives and using second communication module to first communication module transmission data.
Advantageous effect：
The present invention realizes the automatic tuning of launching circuit by increasing an impedance adjusting network in launching circuit；
Additional impedance adjusting network need not be increased by receiving in circuit, be adjusted merely by realize indirectly of transmitting terminal power work frequency and connect
It withdraws road to tune automatically, greatly reduces hardware complexity, energy loss and the control difficulty of receiving terminal circuit.
The technical solution further illustrated the present invention below in conjunction with the accompanying drawings.
Description of the drawings
Fig. 1 is the circuit diagram of present system.
Fig. 2 is magnet coupled resonant type wireless electric energy transmission system schematic diagram.
Fig. 3 is the two-port network illustraton of model of radio energy transmission system.
Fig. 4 is radio energy transmission system bilateral tuning methods schematic diagram.
Fig. 5 is π type impedance adjusting network figures.
Z when Fig. 6 is coefficient of coup k variationsinThe Z of sumoutSimulation result figure.
The simulation result figure of system efficiency of transmission η when Fig. 7 is coefficient of coup k variations.
Fig. 8 is receiving side resonant capacitance CDThe simulation result figure of system efficiency of transmission η during variation.
Fig. 9 is load impedance variation ZLWhen system efficiency of transmission η simulation result figure.
Specific embodiment
Magnet coupled resonant type wireless electric energy transmission system provided by the invention, as shown in Figure 1, including by high frequency electric source, end
Mouth 1, emitting side resonant capacitance, transmitting coil are sequentially connected electrically the launching circuit of composition and by receiving coil, receiving side resonance electricity
Appearance, loads the reception circuit for being sequentially connected electrically composition at port 2, passes through magnetic coupling between the transmitting coil and receiving coil
It is connected；In the launching circuit be equipped with directional coupler detection module, control module 1, program-controlled voltage source, communication module 1, with
And by variable capacitance C1, variable capacitance C2, variable inductance L1The π type impedance adjusting networks of composition, the directional coupler detect mould
Block is connected at launching circuit middle port 1, the directional coupler detection module, program-controlled voltage source, communication module 1 respectively with control
Molding block 1 is electrically connected, the variable capacitance C1, variable capacitance C2, variable inductance L1It is electrically connected respectively with program-controlled voltage source；It is described
It receives and current detection module, voltage detection module, phase discriminator, control module 2 and communication module 2, the electricity is equipped in circuit
Stream detection module, which is connected on, to be received at circuit middle port 2, and the voltage detection module, which is connected in parallel on, to be received at circuit middle port 2, institute
State current detection module, voltage detection module is electrically connected respectively with phase discriminator, the phase discriminator, communication module 2 respectively with
Control module 2 is electrically connected.
The directional coupler detection module is used to detect the reflectance factor at launching circuit middle port 1 and is input to control
In module 1；The communication module 1 is used to obtain receiving electric current, voltage phase difference information and the input control at circuit middle port 2
In module 1；The control module 1 is for processing detection to reflectance factor, phase information and the output frequency for controlling high frequency electric source
The output voltage of rate and programmable power supply so that reflectance factor is 0 at port 1, and Current Voltage phase difference is 0 at port 2；The journey
Control voltage source is used to adjust variable capacitance C1, variable capacitance C2, variable inductance L1Value, so as to adjust at launching circuit middle port 1
Input impedance；The current detection module, voltage detection module be respectively used to detection receive circuit middle port 2 at electric current,
Voltage is simultaneously sent in phase discriminator；The phase discriminator be used for obtain above-mentioned electric current, voltage signal phase difference and be sent to
In control module 2；The control module 2 is used for the phase information that processing detection arrives and utilizes communication module 2 to communication module 2
Transmission data.
The bilateral self-tuning method of magnet coupled resonant type wireless electric energy transmission system provided by the invention, using above-mentioned system
System, carries out according to the following steps：
Step 1., which first tunes, receives circuit：Power work frequencies omega is adjusted, until what is detected is received back at road port 2
Electric current, voltage phase difference 0, the impedance for receiving circuit meet Im (Zout+ZL(the Z of)=0out、ZLOutput resistance respectively at port 2
Anti- and load impedance, Im (*) expressions take imaginary part), circuit being received at this time, resonance occurring, power work frequency at this time is denoted as
ω0。
Step 2. retunes launching circuit：It is ω to make power work frequency perseverance0, adjust in the π types impedance adjusting network
C1、C2、L1Value, reflectance factor at the port 1 detected is 0, and the impedance of launching circuit meets Im (Zin+ZS)=0,
And Re (Zin)=Re (ZS)(Zin、ZSThe respectively input impedance at port 1 and the internal resistance of source, Im (*) expressions take imaginary part, Re (*)
Expression takes real part), resonance occurs for launching circuit at this time, and output power of power supply is maximum；
Step 3. repeats step 1, step 2, until the impedance for detecting obtained launching circuit meets | Im (Zin+ZS)|<A, |
Re(Zin)-Re(ZS)|<B, the impedance for receiving circuit meet | Im (Zin+ZS)|<C, a, b, c are the threshold value of setting.
The principle of the present invention：
One typical magnet coupled resonant type wireless electric energy transmission system equivalent circuit as shown in Fig. 2, including high frequency electric source,
Transmitting coil, emitting side resonant capacitance, receiving coil, receiving side resonant capacitance and the several parts of load.Launching circuit is with connecing
Withdraw road have identical EMR electromagnetic resonance frequency, resonated by magnetic coupling therebetween, so as to make energy efficiently from
Emit lateral receiving side transmission, coil-span is wireless transmission distance.
Above-mentioned radio energy transmission system can be equivalent to two-port network model shown in Fig. 3, wherein CS、CDRespectively send out
It penetrates, receiving coil resonant capacitance, LS、LDRespectively transmitting, receiving coil equivalent inductance, RS、RDRespectively transmitting, receiving coil
Equivalent resistance, ZSFor the internal resistance of source, ZLFor load impedance, mutual inductances of the M between two coils.USFor power supply open-circuit voltage.U1、I1Point
Input voltage and electric current that Wei be at the 1-1' of port, U2、I2Input voltage and electric current at respectively port 2-2'.
By the connection relation in Fig. 3, can be obtained according to Kirchhoff's law：
Wherein, A=(RS+jωLS+1/jωCS)/j ω M, C=1/j ω M, D=- (RD+jωLD+1/jωCD)/jωM
B=- (RS+jωLS+1/jωCS)(RD+jωLD+1/jωCD)/jωM+jωM
Input impedance Z at the 1-1' of two-port network portinWith the output impedance Z at the 2-2' of portoutFor
The output power of power supply is expressed as
By formula (4) it is found that as the input resistant matching condition Z of port 1-1'in=ZS *When, the power of power supply output is most
Greatly, at this time
The power of load absorption is expressed as
The ratio between the power of load absorption and output power of power supply are defined as efficiency of transmission, can be obtained
In engineer application, it is often desirable that the efficiency of transmission of radio energy transmission system is maximized, for this reason, it may be necessary to make system
Launching circuit, receive circuit be operated in resonant condition, that is, meet condition Im (Zin+ZS)=0 and Im (Zout+ZL)=0, at this time
Purely resistive is presented with receiving circuit in transmitting.However in a practical situation, transmission range variation, load impedance variation, coil not
The factors such as alignment, circuit parasitic Parameters variation can all change impedance loop so that Im (Zin+ZS) ≠ 0, Im (Zout+ZL) ≠ 0, this
When system efficiency of transmission will substantially reduce, need to retune system.
In order to solve problem above, the present invention is tuned radio energy transmission system using method shown in Fig. 4：By
It is closely related in circuit impedance and emitting side power work frequency, in circuit is received, by adjusting the supply frequency of emitting side
ω makes it meet condition of resonance Im (Zout+ZL)=0；Impedance adjusting network is added in launching circuit, is gone out with adjusting port 1
Input impedance ZinSo that Im (Zin+ZS)=0 on this basis, further meets impedance matching condition Re (Zin)=Re
(ZS), make the power that power supply exports maximum.π types impedance adjusting network in launching circuit is made of variable capacitor array, inductance,
As shown in Figure 5.
In order to realize automatic tuning, detection, control, driving unit are added in circuit system, is constituted as shown in Figure 1
Bilateral self-tuning radio energy transmission system circuit of the present invention.
The method of the present invention is compared with traditional radio energy transmission system self-tuning method.
Traditional self-tuning method includes：
Frequency tracking method.It is consistent the resonant frequency of power supply output frequency moment and coil, the certain journey of this method
Degree solves the problems, such as that coil is easily detuning, however when transmitting coil and inconsistent receiving coil resonant frequency variation, this method
It can not no longer be applicable in；
Impedance mapping method.Using four loop constructions, by adjusting the relative position tune between source coil and transmitting coil
The mapping impedance of whole launching circuit adjusts the mapping impedance in the relative position adjustment reception circuit of receiving coil and loading coil,
This method can realize that bilateral tunes, however need to increase source coil and loading coil, considerably increase the structural complexity of system；
The method that bilateral adds in impedance adjusting network.This method respectively adds in one by storing up in radiating circuit, receiving circuit
Impedance adjusting network, driving circuit of energy element composition etc., are respectively intended to tuning launching circuit and receiving circuit, although this method
It can realize that bilateral tunes, however additional impedance adjusting network is increased in circuit is received, necessarily consume more energy simultaneously
Increase control difficulty.And in many cases, due to limitations such as terminal device volume, weight, do not allow to increase in circuit is received
Add additional component.
Advantage of this method compared with traditional self-tuning method is：Without increasing additional first device in receiving circuit
Part, the working frequency for being adjusted merely by emitting side power supply to realize that receive circuit tunes automatically indirectly, enormously simplify receiving side
Circuit structure, be easily integrated receiving circuit, at the same also reduce energy loss with control difficulty.
Effect of the present invention is illustrated by the experiment of following contrast simulation.
Magnet coupled resonant type wireless energy transmission system has the related parameter as shown in table 1 in experiment.
1 magnet coupled resonant type wireless energy transmission system parameter of table
| Parameter type | Parameter value | Parameter type | Parameter value |
| Transmitting coil inductance value LS | 11.5uH | Receiving coil inductance value LD | 14.6uH |
| Transmitting coil resistance RS | 522.3mΩ | Receiving coil resistance RD | 563.2mΩ |
| Emitting side resonant capacitance CS | 350pF | Receiving side resonant capacitance CD | 277pF |
| Internal resistance of source ZS | 50Ω | Coefficient of coup k | 0.2 |
| Load impedance ZL | 50Ω | Supply frequency | 2.5MHz |
Bring A, B, C, D parameter into formula (2), (3) can obtain input impedance Z at system launching circuit middle port 1in, connect
Withdraw the output impedance Z at road middle port 2outRespectively：
Wherein M is coil mutual inductance, and the relationship of the coefficient of coup k and M are：
(1) situation of coefficient of coup variation
It is 0.1-0.8 to set coefficient of coup k variation ranges, and the input at port 1 can be obtained according to formula (8), (9), (10)
Impedance Zin, output impedance Z at port 2outNumerical Simulation Results it is as shown in Figure 6.As it can be seen that in coefficient of coup k=0.22,
Meet condition of resonance Im (Zin+ZS) ≈ 0, Re (Zin)≈Re(ZS)=50 Ω, Im (Zout+ZL)≈0.When coefficient of coup k deviates
When 0.22, no longer meet more than condition of resonance.
Radio energy transmission system bilateral self-tuning is realized using proposition method of the present invention, is carried out according to the following steps：
Step 1., which first tunes, receives circuit：By formula (9) it is found that receiving the output impedance Z of circuit middle port 2outWith power supply
Working frequency ω is related.Power work frequencies omega is adjusted, until the impedance for receiving circuit meets Im (Zout+ZL(Im (*) table of)=0
Show and take imaginary part), power work frequency at this time is denoted as ω0。
Step 2. retunes launching circuit：It is ω to make power work frequency perseverance0, after adding in the π types impedance adjusting network,
Input impedance Z at launching circuit middle port 1inWith C in impedance adjusting network1、C2、L1It is related.Adjust C1、C2、L1Value, until
The impedance of launching circuit meets Im (Zin+ZS)=0, and Re (Zin)=Re (ZS) (Re (*) expressions take real part).
Step 3. repeats step 1, step 2, until the impedance for detecting obtained launching circuit meets | Im (Zin+ZS)|<A, |
Re(Zin)-Re(ZS)|<B, the impedance for receiving circuit meet | Im (Zin+ZS)|<C (a, b, c are the threshold value of setting).
The Numerical Simulation Results of system efficiency of transmission are obtained according to formula (7) as shown in fig. 7, visible system does not carry out automatically
During tuning, in coefficient of coup k=2.2, due to meeting condition of resonance Im (Zin+ZS) ≈ 0, Re (Zin)≈Re(ZS), Im (Zout+
ZL) ≈ 0, the efficiency of transmission highest of system, the efficiency of transmission of system can all be reduced by increasing or reducing the coefficient of coup at this time.Using upper
It states after method retunes system, the efficiency of transmission of system, which has, to be significantly improved, and coefficient of coup k is 0.1~0.8
Between when changing, the efficiency of transmission of system is maintained at more than 91.3%.
(2) variation of receiving side resonant capacitance value, load impedance situation of change
Similarly, it in the variation of receiving side resonant capacitance value, load impedance variation, is tuned, obtains by above three step
The simulation result arrived is as follows：
The simulation result of system efficiency of transmission is not as shown in figure 8, system carries out automatically when receiving side resonant capacitance value changes
During tuning, in receiving side resonant capacitance CdThe efficiency of transmission highest of system during=277pF, when receiving side resonant capacitance value deviates
During 277pF, the efficiency of transmission of system reduces rapidly.After being retuned using the above method to system, the transmission effect of system
Rate is significantly improved, and when receiving side resonant capacitance changes between 200-400pF, the efficiency of transmission of system is maintained at
More than 94.7%.
The simulation result of system efficiency of transmission is as shown in figure 9, when system is tuned automatically when load impedance value changes,
In load impedance ZLThe efficiency of transmission highest of system during=30 Ω Europe, when load impedance deviates 30 Ω, the efficiency of transmission of system
It reduces.After being retuned using the above method to system, the efficiency of transmission of system, which has, to be significantly improved, when load hinders
When anti-value changes between 10-100 Ω, the efficiency of transmission of system is maintained at more than 94.2%.
Claims (2)
1. a kind of bilateral self-tuning method of magnet coupled resonant type wireless electric energy transmission system, it is characterized in that the system is included at least
The launching circuit that forms is sequentially connected electrically by high frequency electric source, first port, emitting side resonant capacitance, transmitting coil and at least by connecing
Take-up circle, receiving side resonant capacitance, second port, load are sequentially connected electrically the reception circuit of composition, and the transmitting coil is with connecing
It is connected between take-up circle by magnetic coupling, the rear end of first port and emitting side resonant capacitance in the launching circuit
Increase an impedance adjusting network between front end, then carry out according to the following steps：
Step 1., which first tunes, receives circuit：Power work frequencies omega is adjusted, until the impedance for receiving circuit meets Im (Zout+ZL)=
0, Zout、ZLOutput impedance and load impedance respectively at second port receive circuit and resonance occur, at this time by electricity at this time
Source working frequency is denoted as ω0；
Step 2. retunes launching circuit：It is ω to make power work frequency perseverance0, the parameter value of the impedance adjusting network is adjusted, directly
Impedance to launching circuit meets Im (Zin+ZS)=0, and Re (Zin)=Re (ZS), Zin、ZSInput respectively at first port
Impedance and the internal resistance of source, resonance occurs for launching circuit at this time, and output power of power supply is maximum；
Step 3. repeats step 1, step 2, until the impedance of launching circuit meets | Im (Zin+ZS)|<A, | Re (Zin)-Re(ZS)|
<B, the impedance for receiving circuit meet | Im (Zin+ZS)|<C, a, b, c are the threshold value of setting；
The impedance adjusting network is by variable capacitor array C1, variable capacitor array C2, variable inductance L1The π type impedances of composition
Regulating networks, wherein variometer L1Include a variable capacitor array and a fixed value inductance.
2. a kind of magnet coupled resonant type wireless electric energy transmission system, including at least by high frequency electric source, first port, emitting side resonance
Capacitance, transmitting coil are sequentially connected electrically the launching circuit of composition and at least by receiving coil, receiving side resonant capacitance, second ends
Mouth, load are sequentially connected electrically the reception circuit of composition, are connected between the transmitting coil and receiving coil by magnetic coupling；
In the launching circuit be equipped with directional coupler detection module, the first control module, program-controlled voltage source, first communication module, with
And by variable capacitor array C1, variable capacitor array C2, variable inductance L1The π type impedance adjusting networks of composition, wherein variable inductance
Device L1Include a variable capacitor array and a fixed value inductance；The directional coupler detection module is connected on launching circuit
At middle first port, the directional coupler detection module, program-controlled voltage source, first communication module respectively with the first control module
Electrical connection, the variable capacitance C1, variable capacitance C2, variable inductance L1It is electrically connected respectively with program-controlled voltage source；The reception circuit
In be equipped with current detection module, voltage detection module, phase discriminator, the second control module and second communication module, the electric current
Detection module, which is connected on, to be received in circuit at second port, and the voltage detection module, which is connected in parallel on, receives second port in circuit
Place, the current detection module, voltage detection module are electrically connected respectively with phase discriminator, the phase discriminator, the second communication mould
Block is electrically connected respectively with the second control module.
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| CN112140914B (en) * | 2020-09-10 | 2022-06-24 | 军事科学院系统工程研究院军事新能源技术研究所 | Unmanned aerial vehicle power supply system |
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| CN103166328A (en) * | 2011-12-19 | 2013-06-19 | Lg伊诺特有限公司 | Wireless power transmitter, wireless power receiver and wireless power transmission method |
| CN104508768A (en) * | 2012-05-11 | 2015-04-08 | 动量动力学公司 | A method of and apparatus for generating an adjustable reactance |
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