CN109190288A - Resonator analogue system and emulation mode based on the transmission of resonance type wireless electric energy - Google Patents
Resonator analogue system and emulation mode based on the transmission of resonance type wireless electric energy Download PDFInfo
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Abstract
The invention belongs to wireless power transmission technical fields, disclose a kind of resonator analogue system and emulation mode based on the transmission of resonance type wireless electric energy, voltage inversion analytical unit, alternating current is generated by full-bridge rectification inversion for input direct-current voltage, the ac waveform after inversion is obtained by oscillograph；Two coil-end voltage analysis units, using the main parallel-connection structure when connecting secondary of coil topology model, obtaining input voltage can waveform diagram；Receiving coil voltage waveform such as figure and voltage magnitude are obtained by waveform diagram；Output voltage and output current analysis unit, carry out rectifying and wave-filtering to obtained resonance potential, by load output voltage, while obtaining the waveform diagram of output voltage；Output power and delivery efficiency analytical unit establish input power and delivery efficiency model, analyze output power and delivery efficiency.Resonator provided by the invention can realize the wireless power transmission of medium output power by changing frequency.
Description
Technical field
The invention belongs to wireless power transmission technical field more particularly to it is a kind of based on resonance type wireless electric energy transmission it is humorous
Device analogue system of shaking and emulation mode.
Background technique
Currently, the prior art commonly used in the trade is such that in recent years, with development in science and technology, electronic product is more and more,
Also increasingly make rapid progress, such as many products of mobile phone, tablet computer, laptop all update always, but fill
Electric problem can not improve always, be at charging modes the most traditional for a long time, but this traditional charging modes exist
Many drawbacks, such as: distance limitation, charging cable are easy that bad, efficiency of transmission is slow, even there is also many security risks, then newly
The wireless charging mode of type enters in the sight of scientist.
It is transmitted compared with traditional wired electric energy, wireless power transmission is more convenient, transmission range is farther more efficient, simultaneously
Security risk is greatly reduced, and provides many conveniences using electronic product to after the mankind.
After tesla proposes this theory of wireless power transmission, many scientists have put into energy research, this is several years
Also great achievement is achieved, several times will increased apart from the upper design much than most starting, efficiency of transmission is also got over
Come higher, some even start to be applied among life of the invention, it is believed that continue development and progress with science and technology, wirelessly
Electric energy transmission will be widely used in greatly among life of the invention, be entered in the sight of the whole mankind.
Wireless energy transfer (WPT), this is a kind of contactless electric energy transmission mode, specifically refers to use transmitting by electric energy
The relaying energy of other forms is converted to, then carries out being received and converted to electric energy with receiver.This theoretical people is proposed earliest
It is famous physicist Ni Gula tesla.Early in 1890, Nicholas proposed this theory, and the earth is assumed
One inner conductor, the earth ionosphere be set as outer conductor, by amplification transmitter with scene electromagnetic wave oscillation mode, then again
The low-frequency resonance of about 8HZ is set up between ground body and ground absciss layer, and the electromagnetic wave around earth surface is recycled to carry out energy
Amount transmission.Although last because of financial resources and various factors, this bold idea of Ni Gula tesla is with failure
Come to an end.There are many scientists to further investigate wireless power transmission one by one below, developing this technology gradually
Get up.The research group of exactly in June, 2006 Massachusetts Institute of Technology more famous in recent years is sent out on the U.S. " science " magazine
The research achievement of table.It is fabricated to the resonator that coil treats as electromagnetism using the good copper wire of electric conductivity, by adjusting copper
The resonance frequency of coil allows coil to reach resonance, to realize the wireless conduction of electric energy.This experiment at present at
Function is 60 watts of bulb powereds outside one two meters, and power supply efficiency is in wireless power transmission between 40% and 50%
Research field achieves huge advance.
Current wireless power transmission attracts attention, but still the microwave radiation formula, magnetic coupling resonance mainly to attract attention
Three kinds of formula, inductive coupling type.These three have the advantages that respective in transimission power, efficiency of transmission, transmission range etc., are answered
For many fields.
(1) microwave radiation type micro-wave radiant type is otherwise known as remote radiant type.This transmission mode be using antenna come
Realize the transmission and receiving of energy.Because far field is utilized to carry out energy transmission, the transmission range of this transmission mode
It is far longer than the R-T unit of energy, is when former can be realized the wireless power transmission mode transmitted at a distance.
(2) basic principle of inductive coupling type electromagnetic induction coupling, the high frequency rectangular wave that will be obtained by DC voltage inversion
Voltage is coupled to secondary coil from the primary coil of detachable transformer, realizes the non-contact transmission of electric energy.In all nothings
In line electric energy transmission technology, this most mature one kind at last, it is big by one compared with other several technologies that it can be realized transimission power
A bit, disadvantage is exactly that transmission range is shorter, is limited by very large.The pointing devices such as common mobile phone, plate are based on this
It is developed in kind transmission mode, unfortunately because of the too close reason of transmission range, development is restricted significantly.
(3) magnet coupled resonant type magnet coupled resonant type is a kind of transmission technical ability to attract attention at present, he is to utilize coil
Generation resonance is only seen with coil, that is, generates energy transmission using both sides coil frequencies is identical, belongs near field transmission, it
Transmission range is influenced by coil radius size, and abnormal obvious, so usually transmission range only has several centimetres to several meters, this
The shortcomings that being also this transmission mode.But the device of magnet coupled resonant type is relatively easy, and business efficiency is also high, in moderate distance
When, efficiency of transmission also calculates rough height.
In conjunction with the characteristics of the above various wireless power transmissions, it can be deduced that will have at it in the following aspects more wide
General application prospect.
(1) electronic field today's society, development in science and technology are maked rapid progress, and electronic equipment becomes the essential thing of the mankind,
Almost manpower all has mobile phone, plate, but the charging but strong influence use of people of electronic equipment, and unlimited electric energy passes
This defeated technology can be good at solving the problems, such as charging, bring better experience for consumer, can be more square to people
Just and fast, while the safety of charging electricity consumption is also improved.
(2) nowadays medical development is rapidly almost together with S&T integration for medical field, and medical supply is also varied, X
Light recording instrument, magnetic resonance, pacemaker etc., wherein pacemaker is a kind of equipment for being implanted into human body, when its charging
It is charged by external charging system, there is many inconvenient and harm, wireless charging technology just to can be good among this
Solve this problem.
(3) for traffic and transport field with development in science and technology, the traffic of people is very convenient, every household have trolley,
Motorcycle, but these vehicles produce many carbon dioxide, largely destroy the living environment of the mankind, so
Present new energy is emerged successively, and electric bicycle, electric car fall over each other to go up on the stage.But the charging of these new-energy automobiles is always
One very big problem, and wireless charging technology can solve the problems, such as that very well this is a.
Certainly, in addition to provided above, there are also the applications in many fields, such as space flight, network etc. for wireless power transmission.It can
Cherish, till now in the world about magnet coupled resonant type wireless electric energy transmission research or very limited, many colleges and universities and section
Skill research institute has put into a large amount of manpower and material resources to study this technology, as long as magnet coupled resonant type wireless can be developed
Electric energy transmission obtains important breakthrough on high-power and high efficiency, then this applies orientation by further expansion.
It is continually striving to study by this several years countless scientists and research department, wireless power transmission technology has greatly
It breaks through, but still there are many problems, by taking three kinds of wireless power transmission technologies the most main as an example, microwave radiation formula is passed
Defeated distance is although far, but efficiency of transmission is but very low, but also there is radiation influential on human body, only suitable at present
For military aspect either space power station Tai Neng etc..This transmission technology of inductive coupling type it is high-efficient, but exist
The critical defect of the short this aspect of transmission range, is difficult to apply among life of the invention.In transmission range, magnetic coupling is high
It is coupled in electromagnetic induction, in efficiency of transmission, magnetic coupling is higher than microwave wireless transmission technology, but in power a variety of occasions at a distance
Than less suitable for being a kind of medium transmission range, the wireless power transmission mode of medium transimission power.
In conclusion problem of the existing technology is:
By taking three kinds of wireless power transmission technologies the most main as an example, microwave radiation formula transmission range is although far, still
Efficiency of transmission is but very low, but also there is radiation influential on human body, is only applicable to military aspect at present either
The space power station Tai Neng；This transmission technology of inductive coupling type it is high-efficient, but transmission range is short, is difficult to apply to live it
In；
In transmission range, magnetic coupling is coupled higher than electromagnetic induction, and in efficiency of transmission, magnetic coupling is passed higher than microwave wireless
Transferring technology, but be not suitable for power and transmit at a distance.
Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of resonators based on the transmission of resonance type wireless electric energy
Analogue system and emulation mode.
The invention is realized in this way a kind of resonator analogue system based on the transmission of resonance type wireless electric energy, the base
Include: in the resonator analogue system of resonance type wireless electric energy transmission
Voltage inversion analytical unit generates alternating current by full-bridge rectification inversion for input direct-current voltage, passes through oscillography
Device obtains the ac waveform after inversion；
Two coil-end voltage analysis units are inputted using the main parallel-connection structure when connecting secondary of coil topology model
Voltage can waveform diagram；Receiving coil voltage waveform such as figure and voltage magnitude are obtained by waveform diagram；
Output voltage and output current analysis unit, carry out rectifying and wave-filtering to obtained resonance potential, are exported by load
Voltage, while obtaining the waveform diagram of output voltage；
Output power and delivery efficiency analytical unit, establish input power and delivery efficiency model, analysis output power and
Delivery efficiency.
Another object of the present invention is to provide the resonator based on the transmission of resonance type wireless electric energy described in a kind of carrying is imitative
The wireless charging intelligent electronic device of true system.
Another object of the present invention is to provide the resonator based on the transmission of resonance type wireless electric energy described in a kind of carrying is imitative
The wireless charging intelligent medical equipment of true system.
Another object of the present invention is to provide the resonator based on the transmission of resonance type wireless electric energy described in a kind of carrying is imitative
The wireless charging intelligent electric motor car amount of true system.
It is imitative using the resonator based on the transmission of resonance type wireless electric energy that another object of the present invention is to provide a kind of
The resonator emulation mode based on the transmission of resonance type wireless electric energy of true system, comprising:
The simulation model that fixed range is established by simulation software Simulink, by changing frequency to the biography of Transmission system
Defeated efficiency, transimission power are analyzed；
The optimal resonance type wireless electric energy transmission resonator analysis of transmission highest, efficiency of transmission is carried out under resonance.
Further, during transimission power is analyzed, comprising:
Establish input power and delivery efficiency model
P=IU
Output power calculates formula:
Transimission power, efficiency of transmission at different frequencies are calculated by two above formula.
Another object of the present invention is to provide a kind of resonators based on the transmission of resonance type wireless electric energy to be provided with
Full bridge inverter；
The full bridge inverter is connect by conducting wire with mutual inductor, and mutual inductor passes through conducting wire and rectifier and filtering
Device connection；
There are four MOSFET, four MOSFET to be connected to each other by conducting wire connection for full bridge inverter；
Mutual inductor is using main when connecting secondary.
Further, described be connected between two mosfets by conducting wire negates circuit.
Further, the full bridge inverter, mutual inductor and rectifier and filter pass through conducting wire and are connected with voltage
Table and ammeter.
In conclusion advantages of the present invention and good effect are as follows:
Resonator provided by the invention can realize the wireless power transmission of medium output power by changing frequency.
The present invention expands study and analysis with regard to wireless power transmission, and wherein emphasis understands and independently analysis magnetic coupling is humorous
Then the principle and application of vibration formula radio energy transmission system establish the imitative of a fixed range by simulation software Simulink
True mode analyzes efficiency of transmission, the transimission power of Transmission system by changing frequency, so that verifying is in resonance type wireless
The principle of electric energy transmission finally completes the optimal resonance type wireless electric energy of transmission highest, efficiency of transmission under resonance and transmits resonance
Device.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the resonator provided in an embodiment of the present invention based on the transmission of resonance type wireless electric energy；
In figure: 1, MOSFET；2, mutual inductor；3, rectifier；4, filter；5, voltmeter；6, ammeter；7, electricity is negated
Road.
Fig. 2 is the circuit diagram of the resonator provided in an embodiment of the present invention based on the transmission of resonance type wireless electric energy；
Fig. 3 is magnet coupled resonant type equivalent schematic diagram provided in an embodiment of the present invention；
Fig. 4 is series resonant circuit figure provided in an embodiment of the present invention；
Fig. 5 is magnet coupled resonant type wireless energy transmission system structure chart provided in an embodiment of the present invention；
Fig. 6 is four kinds of basic block diagrams provided in an embodiment of the present invention；
Fig. 7 is full bridge inverter figure provided in an embodiment of the present invention；
Fig. 8 is E class power amplification circuit figure provided in an embodiment of the present invention；
Fig. 9 is each working stage waveform diagram of E class power amplification circuit provided in an embodiment of the present invention；
Figure 10 is full bridge rectifier figure provided in an embodiment of the present invention；
Figure 11 is E class rectification circuit figure provided in an embodiment of the present invention；
Figure 12 is mutual inductor circuit diagram provided in an embodiment of the present invention；
Figure 13 is rectifying and wave-filtering structure chart provided in an embodiment of the present invention；
Figure 14 is inverter voltage waveform diagram provided in an embodiment of the present invention；
Figure 15 is transmitting coil voltage oscillogram provided in an embodiment of the present invention；
Figure 16 is receiving coil voltage oscillogram provided in an embodiment of the present invention；
Figure 17 is output voltage waveform provided in an embodiment of the present invention；
Figure 18 is output current wave figure provided in an embodiment of the present invention；
Figure 19 is output power meter nomogram provided in an embodiment of the present invention；
Figure 20 is delivery efficiency calculating figure provided in an embodiment of the present invention；
Specific embodiment
In order to further understand the content, features and effects of the present invention, the following examples are hereby given, and cooperate attached drawing
Detailed description are as follows.
Resonator analogue system provided in an embodiment of the present invention based on the transmission of resonance type wireless electric energy, comprising:
Voltage inversion analytical unit generates alternating current by full-bridge rectification inversion for input direct-current voltage, passes through oscillography
Device obtains the ac waveform after inversion；
Two coil-end voltage analysis units are inputted using the main parallel-connection structure when connecting secondary of coil topology model
Voltage can waveform diagram；Receiving coil voltage waveform such as figure and voltage magnitude are obtained by waveform diagram；
Output voltage and output current analysis unit, carry out rectifying and wave-filtering to obtained resonance potential, are exported by load
Voltage, while obtaining the waveform diagram of output voltage；
Output power and delivery efficiency analytical unit, establish input power and delivery efficiency model, analysis output power and
Delivery efficiency.
Resonator emulation mode provided in an embodiment of the present invention based on the transmission of resonance type wireless electric energy, comprising:
The simulation model that fixed range is established by simulation software Simulink, by changing frequency to the biography of Transmission system
Defeated efficiency, transimission power are analyzed；
The optimal resonance type wireless electric energy transmission resonator analysis of transmission highest, efficiency of transmission is carried out under resonance.
Below with reference to concrete analysis, the invention will be further described.
As shown in Fig. 1-Figure 20, the resonator provided in an embodiment of the present invention based on the transmission of resonance type wireless electric energy includes:
MOSFET1, mutual inductor 2, rectifier 3, filter 4, voltmeter 5, ammeter 6, circuit 7 is negated.
The full bridge inverter connect by conducting wire with mutual inductor 2, mutual inductor 2 pass through conducting wire and rectifier 3 and
Filter 4 connects；There are four MOSFET1, four MOSFET1 to be connected to each other by conducting wire connection for full bridge inverter；Mutual inductance line
Circle 2, when connecting secondary, is connected with by conducting wire between two MOSFET1 using main and negates circuit 7；Full bridge inverter, mutually
Voltmeter 5 and ammeter 6 are connected with by conducting wire on sense coil 2 and rectifier 3 and filter 4.
It is of the invention when in use, by full bridge inverter selection four MOSFET be attached because in MATLAB
MOSFET is on state, is closed MOSFET on one side so to be also added one and negate circuit, is just able to achieve in this way
Inversion, after establishing full bridge inverter, it is also contemplated that some factors of MOSFET, wherein the most main is exactly electrostatic damage
Consumption, so the present invention also wants a resistance in parallel before MOSFET, the main function of this resistance is exactly to prevent electrostatic damage
MOSFET, the foundation of mutual inductor are made of together a transformer and inductance, and configuration aspects are connected secondary using main side
DC power supply is accessed full-bridge inverting by side, wherein inputting frequency on string, the mutual inductance line of serial parallel structure is accessed after full-bridge inverting
Circle, then rectifier and capacitor filtering are accessed, finally via load.Wherein voltmeter measurement input voltage, resonance potential, output electricity
Pressure, ammeter measure input current, output electric current.Wherein supply voltage is set as the DC voltage of 20V, and input resonance frequency is
45kHz, the capacitor C of coiler part1C2Parameter is all set as 0.47uF, inductance LmLm1All it is arranged to 28uH, filter circuit part
Filter capacitor C3Parameter is 1mF, and last output resistance is 50 Ω.
Resonance type wireless electric energy transmission principle of the invention is further described combined with specific embodiments below.
1, magnetic coupling wireless power transmission basic principle
The transmission of resonance type wireless electric energy is that the electric energy transmission of short distance is generated using resonance principle, wherein transimission power, biography
Defeated distance, efficiency of transmission are to judge the important indicator of a wireless transmitting system, only realize high-power, high efficiency, remote
It is only and realizes wireless power transmission technology.
Wireless power transmission is that coupling is realized between the object of identical resonance frequency using alternating magnetic field as transmission medium
Resonance and a kind of energy transmission mode for carrying out efficient energy exchange.And magnet coupled resonant type wireless electric energy transmission technology is exactly
Using two coils with identical resonance frequency when differing certain distance, resonance is generated by magnetic coupling, to carry out energy
Transmitting.It is analyzed according to Fig. 3, coil LSWith coil LDWhen transmission range is D, resonance frequency is identical, with LSThat section accesses power supply,
It allows it endlessly to provide energy for this resonator system, in addition consumes energy on one side, to realize the transmission of energy.
Wherein magnetic coupling and resonance are to realize the major factor of wirelessly transmitting electrical energy transmission.
So-called magnetic coupling is the curent change of a coil, generates induced electromotive force in adjacent coil, they are in electricity
Aspect is independent of one another, between influence each other and connected by magnetic field[3].The efficiency of coupling determines energy transmission
Efficiency, while also determining the distance of energy transmission, wherein the coefficient of coup is most important, indicates to couple between two coils
Tightness degree, by the ratio between the maximum limit of mutual inductance (absolute value) and coil inductance between coil at the coefficient of coup.It calculates public
Formula is as follows:
In magnet coupled resonant type wireless electric energy transmission technology, the coupling between coil and coil is based on electromagnetic induction pressure
Power, when the magnetic flux of closed circuit institute's envelope surface product changes at any time, circuit will have induced electromotive force generation, induction electric
The size of gesture is directly proportional to the variation of magnetic flux is passed through, and here it is Faraday's electromagnetic induction laws.
And in magnetic coupling resonant radio can transmit, most important two indices are exactly resonance frequency and quality factor.
Only when transmitter is consistent with the resonance frequency of receiver, it can realize that electric energy transmits, and quality factor are resonance
Important indicator in circuit, when quality factor are higher, the loss of ability is smaller, is more conducive to improve energy transmission efficiency, such as Fig. 4
It is shown.
The resonant circuit structure is simple, is composed in series by input power, inductance, capacitor, resistance.Resonance is combined to manage by figure
By, it can be deduced that:
It can be seen that resonance frequency is related with capacitor, inductive resistance through the formula present invention, also mean that resonance frequency
It is only related with itself circuit.In series resonant circuit, electric current is equal, it is possible to simply obtain the calculating of quality factor
Formula:
2, the composition of magnet coupled resonant type system
Magnet coupled resonant type wireless energy transmission system is mainly by DC power supply, high-frequency inverter circuit, transmitting coil, reception
The part such as coil, rectification circuit, load is constituted, and structure is as shown in Figure 5.
3, two coil resonance system
In terms of coil building, transmitting coil and receiving coil have corresponding string and structure, so entire magnetic coupling is humorous
Vibration formula radio energy transmission system transmission structure composition altogether there are four types of: series connection-series connection, series connection-parallel connection, parallel connection-series connection,
In parallel-in parallel, corresponding circuit model figure is as indicated with 6.
According to four kinds of different circuit structure models, taking out the main cascaded structure when connecting secondary the most universal herein is
Example carries out the detailed derivation of performance Index Formula.
(1) one cascaded structure model of series connection is analyzed:
Z in formula1、Z2One is respectively the impedance loop of transmitting coil and receiving coil, R1、R2Respectively emit and receive line
Enclose the resistance of serial or parallel connection；L1、L2Respectively emit the self-induction C with receiving coil1、C2Respectively transmitting and receiving coil string
Connection or the capacitor (F) of parallel connection, R load resistance (Ω), W is resonance angular frequency (rad/s), by Kirchhoff's law it can be concluded that two
The voltage relationship in circuit:
Z1I1- j ω MI=Uin (6)
jωMI-Z2I2=0 (7)
It is that mutual inductance (H) between two coils are can solve twice from resonant tank relationship that U, which is AC power source (V) M, in formula
The circuit on road:
According to the electric current obtained, can computing system output power and efficiency:
It can learn that output power, delivery efficiency are wanted to obtain higher numerical value by formula derived above, just need
Meet corresponding inductance and capacitor reaches resonance, so needing to meet formula (12):
After meeting condition of resonance, available output power and efficiency:
By formula (13), (14) it can be seen that transmission power and efficiency and coil itself parasitic parameter, so connect
Load, resonance frequency, the size of mutual induction amount of system are related, and furthermore transimission power and voltage is square directly proportional, that is, work as voltage
When increasing is twice, transimission power will increase original four times or so, so when selecting coil, the inductance of its own
All it has been determined that as long as remaining select suitable capacitor to be assured that resonance frequency.
Other remaining three kinds of topological structures transimission power at a resonant condition and efficiency of transmission can be with due same
Method analysis.By screening, the design uses the structure of primary side series connection, secondary side parallel connection, that is, string-parallel-connection structure, this knot
Structure is simple, and primary side series connection can be powered with voltage source inverter, and secondary side parallel output reactance is small.
4, inverter
Inverter circuit is exactly the circuit for direct current being become alternating current.It, can according to the difference of DC side energy-storage travelling wave tube form
It is divided into voltage source type inverter and current-mode inverter circuit.Current source inverter is powered to shunt load, therefore also known as in parallel humorous
Shake inverter.Voltage source inverter is powered to series load, therefore also known as series resonant inverter.Full bridge inverter and E class function
Rate amplifier is that should have in wireless power transmission the most frequently.Full bridge inverter is by four semiconductor groups at the same arm
Upper down tube cannot simultaneously turn on, it is necessary to have sufficient time to guarantee dead zone requirement, therefore limit radio energy biography
The defeated working condition under relatively high-frequency, it is more limited in transmission range, but output power is higher.E class power amplification
Device can work at higher frequencies in the transmission of magnet coupled resonant type wireless electric energy, and theoretically working efficiency can reach percent
Hundred, 95 percent Ultra-High Efficiency can be also reached in actual emulation and debugging, but it is more inferior in terms of transimission power
Color is meeting mid power, is there is very big advantage in the magnet coupled resonant type wireless electric energy transmission system of medium transmission range, but
It is that the present invention focuses principally on efficiency of transmission and transimission power, full bridge inverter is selected to be relatively good.It is inverse to two kinds below
The working condition on power transformation road has done a brief analysis, to embody respective superiority.
There are four bridge arms altogether for full bridge inverter, each bridge arm is by a controllable switch and anti-paralleled diode group
At can regard as and be composed of two half-bridge inversion circuits.Bridge arm 1 and 4 as 1 pair, bridge arm 2 and 4 is used as other one
Right, two pairs of bridge arms simultaneously turn on, each 180 ° of conducting of two pairs of alternatings, as shown in Figure 7.
Working principle: the working principle of full bridge inverter is exactly the conducting in turn by switching device so that output voltage
It constantly changes to have the function that inversion.
In t1Moment switching device V1And V4It is conducting, so output voltage u0Equal to UD, reach t1 moment, derailing switch
Part, t1Moment V3And V4Grid signal is on the contrary, V4Cut-off, at this moment, because of the electric current i in load inductance0It can not mutate, therefore
This V3It cannot be connected at once, VD3Afterflow is connected.Which results in V1And VD3It simultaneously turns on, so output voltage is zero.To t2When
Carve V1And V2Grid signal is on the contrary, V1Cut-off, and V2It cannot be connected at once, VD2Conducting afterflow, and VD3Constitute current channel, output
Voltage is-Ud.When to load current and starting reversed, VD2And VD3Cut-off, VD2And VD3It begins to turn on, u0It is still-Ud。
t3Moment V3And V4Grid is reversed again, V3Cut-off, and V4It cannot be connected at once, V4Afterflow, u is connected0It is again zero, mistake later
Journey so recycles, and just completes with entire reversals.
E power-like amplifier is mainly by a semiconductor switch and common capacitor, resistance, inductance and input power
Composition, structure chart are illustrated in fig. 8 shown below.
E class power amplification circuit simply uses switching tube MOSFET, can work in high frequency, wherein inductance L1
For choke coil, act the ripple size for reducing input current, C1For additional capacitor, wherein containing the output electricity of MOSFET
Hold, mainly play a part of to reconcile MOSFET drain-source voltage waveform, to realize that resonance seat assists.Main several work ranks of the circuit
Section is as shown in Figure 9.
(1) in f0Moment, MOSFET become being closed from being connected, and the voltage at both ends is zero, and zero voltage turn-off may be implemented.
When MOSFET resistance is connected, since the presence of conducting resistance can generate pressure drop, size of current is input current and load at both ends
The difference of resonant network output.
(2) in foTo f1Period, MOSFET are off the stage, and the electric current flowed through is zero.MOSFET drain-source voltage can be with
Capacitor C1Charge and discharge and first increase and reduce afterwards, when the big minor adjustment of parameter is suitable, voltage is finally reduced to zero, loads humorous
Vibrating network L2、C2It can mutual charge and discharge.
(3) in t1Moment, MOSFET become being connected from turning off, and the voltage at both ends is zero, and it is open-minded to may be implemented no-voltage,
The electric current that MOSFET flows through at this time is also zero, therefore while opening is also to realize zero current passing.
(4) in t1To t2Period, MOSFET are on the stage, and the voltage at both ends is zero, and the electric current for flowing through it is opened by zero
Beginning gradually increases.In this stage, load resonant network L2、C2Mutual charge and discharge can be generated.
In the application of this secondary design, transmission range is constant, the efficiency of transmission and transimission power paid close attention to emphatically, so not needing
High frequency E power-like amplifier, but select full bridge inverter.
5, it rectifies and filters
Rectification circuit is exactly the circuit for AC energy being converted into direct current.Full bridge rectifier be the most tradition, the most
Common rectification circuit, circuit structure is relatively simple, is only made of, is illustrated in fig. 10 shown below four diodes.
When full bridge structure and secondary coil mutually in succession when, be the difference of serial or parallel connection structure according to secondary coil, it is secondary
The equivalent impedance of coil is different, when secondary coil series connection:
The negative cultivation resistance (Ω) of R mono- is when parallel connection of secondary windings in formula:
In terms of the selection of diode, the high-frequency work state based on system, selection is led as far as possible under the conditions of meeting pressure resistance
Logical pressure drop is small, mentions and consumes small diode.
Compared to full bridge rectifier, E class rectified current only uses a diode, but also needs attachment capacitor and capacitor
Composition, is illustrated in fig. 11 shown below.
When circuit works, the rectifying conversion of voltage is carried out by the shutdown of single diode, is zero when diode shutdown
Voltage zero current shutdown；It is no-voltage conducting when conducting, therefore diode realizes no-voltage during turn-on and turn-off
Effect, can be good at reduce energy loss, this be also why E class rectification circuit work efficiency is high.
The two compares, and full bridge rectifier only needs four diodes to form for structure, and E class rectification circuit
Although only needing a diode, but need additional capacitor and inductance, computationally with the upper more relatively more troubles of debugging.
In working frequency, E class rectification circuit is more advantageous, can work in higher frequency section, and corresponding efficiency of transmission is also higher,
The two is each advantageous.But in this design process, working frequency only need it is medium, so selecting relatively simple complete
Bridge rectification circuit.
Filtering and load are the last parts of entire radio energy transmission system, in order to which the voltage after will be rectified is gentle
Get off, it is necessary first to by filtering, then receive load output voltage.Filter circuit is commonly used in elimination rectifier output voltage
Ripple is generally made of reactance component, such as load resistance both ends shunt capacitor C or with load in series inductor L, Yi Jiyou
The various composite wave filters of capacitor, inductance composition.
Resonance type wireless electric energy transmission resonator modeling of the invention is further described combined with specific embodiments below.
1, full bridge inverter
Full bridge inverter selects four MOSFET to be attached；Because MOSFET is on state in MATLAB,
It negates circuit so the present invention will also be added one and is closed MOSFET on one side, be just able to achieve inversion in this way.It establishes complete
After bridge inverter circuit, it is also contemplated that some factors of MOSFET, wherein the most main is exactly static dissipative, so in MOSFET
The present invention also wants a resistance in parallel before, the main function of this resistance be exactly prevent electrostatic damage MOSFET, and why
It having static dissipative and is because the capacitor that is previously incorporated into is too small, that I guess electrostatic charge very little can also generate very big voltage, this
A resistance provides the channel that parasitic capacitance charge is led off, so it is most important to be previously incorporated into this resistance.
2, mutual inductor is established
The foundation of coil former is made of together an ideal transformer and inductance, and configuration aspects are gone here and there using main side
Join secondary side, as shown in figure 12.
3, rectification circuit and filtering
Circuit of the invention is arranged using full bridge rectifier, and one can directly be arranged in MATLAB simply
Rectifier is connected in series to circuit and is rectified, and so that voltage is gently got off after rectification, needs to be arranged a filtering, the side of filtering
There are many kinds of formulas, and what I selected here is to be connected in parallel with a capacitor to be filtered, and reaches flat by the continuous charge and discharge of electric current
The effect of sliding voltage fluctuation, last filtered voltage pass through load output voltage.Structure chart such as Figure 13 institute of rectification and filtering
Show.
Simulation Model analysis of the invention is further described combined with specific embodiments below.
1, voltage inversion is analyzed
Input 20V DC voltage by full-bridge rectification inversion generate alternating current, by oscillograph it can be concluded that inversion it
Ac waveform afterwards, as shown in figure 14.
As can be seen from Figure 14 voltage is in square wave, and voltage peak 20V is successfully formed size and Orientation and changes at any time
The alternating voltage of change, since circuit debugging problem inverter voltage is not too much gentle, but influence little.
2, two coil-end voltage
Because of the main structure in parallel when connecting secondary that coil topology model uses, this is a kind of Top Modules of isolation boosting
Type, input voltage can increase at random, obtain waveform diagram as shown in 15, can be seen that receiving coil voltage by the waveform diagram present invention
Peak value is 90V.
Receiving coil voltage waveform is as shown in figure 16, and voltage magnitude is in 61 or so
3, output voltage and output electric current
Obtained resonance potential passes through rectifying and wave-filtering, and finally by load output voltage, voltage is gradually increasing at the beginning,
It finally levels off to and 61V and settles out, peak value is about exactly in 61V or so, shown in waveform diagram 16.
4, output power and delivery efficiency analysis
By arranging, I measures input voltage, input current, output electric current, output voltage ammeter and ammeter
It obtains, establishes a formula frame to obtain required input power and delivery efficiency.
Output power calculates formula:
P=IU
Output power calculates formula:
It is as shown in table 1 that transimission power, efficiency of transmission at different frequencies can be calculated by two above formula:
1 output power delivery efficiency of table changes with frequency
It can be seen that two groups of data are higher in table, wherein in the case that one group is resonance frequency 45kHz, output power and defeated
Efficiency is all higher out, and when another set is 35kHz, under the frequency beside resonance frequency, voltage decline is slow, in addition originally setting
Quality factor in meter are lower, and passband is wider, so efficiency of transmission when just will appear 35kHz is high.
The above is only the preferred embodiments of the present invention, and is not intended to limit the present invention in any form,
Any simple modification made to the above embodiment according to the technical essence of the invention, equivalent variations and modification, belong to
In the range of technical solution of the present invention.
Claims (9)
1. it is a kind of based on resonance type wireless electric energy transmission resonator analogue system, which is characterized in that it is described based on resonant mode without
Line electric energy transmission resonator analogue system include:
Voltage inversion analytical unit generates alternating current by full-bridge rectification inversion for input direct-current voltage, is obtained by oscillograph
Ac waveform after inversion out；
Two coil-end voltage analysis units obtain input voltage using the main parallel-connection structure when connecting secondary of coil topology model
It can waveform diagram；Receiving coil voltage waveform such as figure and voltage magnitude are obtained by waveform diagram；
Output voltage and output current analysis unit, carry out rectifying and wave-filtering to obtained resonance potential, by load output voltage,
The waveform diagram of output voltage is obtained simultaneously；
Output power and delivery efficiency analytical unit establish input power and delivery efficiency model, analyze output power and output
Efficiency.
2. a kind of wireless charging intelligence for carrying the resonator analogue system based on the transmission of resonance type wireless electric energy described in claim 1
It can electronic equipment.
3. a kind of wireless charging intelligence for carrying the resonator analogue system based on the transmission of resonance type wireless electric energy described in claim 1
It can Medical Devices.
4. a kind of wireless charging intelligence for carrying the resonator analogue system based on the transmission of resonance type wireless electric energy described in claim 1
It can electric vehicle amount.
5. it is a kind of using described in claim 1 based on resonance type wireless electric energy transmission resonator analogue system based on resonant mode
The resonator emulation mode of wireless power transmission, which is characterized in that the resonator based on the transmission of resonance type wireless electric energy is imitative
True method includes:
The simulation model that fixed range is established by simulation software Simulink imitates the transmission of Transmission system by changing frequency
Rate, transimission power are analyzed；
The optimal resonance type wireless electric energy transmission resonator analysis of transmission highest, efficiency of transmission is carried out under resonance.
6. the resonator emulation mode as claimed in claim 5 based on the transmission of resonance type wireless electric energy, which is characterized in that transmission function
During rate is analyzed, comprising:
Establish input power and delivery efficiency model
P=IU
Output power calculates formula:
Transimission power, efficiency of transmission at different frequencies are calculated by two above formula.
7. it is a kind of using described in claim 1 based on resonance type wireless electric energy transmission resonator analogue system building based on humorous
The resonator of vibration formula wireless power transmission, which is characterized in that the resonator based on the transmission of resonance type wireless electric energy is provided with
Full bridge inverter；
The full bridge inverter is connect by conducting wire with mutual inductor, and mutual inductor is connected by conducting wire and rectifier and filter
It connects；
There are four MOSFET, four MOSFET to be connected to each other by conducting wire connection for full bridge inverter；
Mutual inductor is using main when connecting secondary.
8. the resonator as claimed in claim 7 based on the transmission of resonance type wireless electric energy, which is characterized in that described at two
It is connected between MOSFET by conducting wire and negates circuit.
9. the resonator as claimed in claim 7 based on the transmission of resonance type wireless electric energy, which is characterized in that the full-bridge inverting electricity
Road, mutual inductor and rectifier and filter pass through conducting wire and are connected with voltmeter and ammeter.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110108937A (en) * | 2019-05-10 | 2019-08-09 | 中国电力科学研究院有限公司 | A kind of wireless charging frequency selection purposes method and system based on frequency analysis |
| CN111413570A (en) * | 2020-04-26 | 2020-07-14 | 中铁电气化局集团有限公司 | Method and device for detecting mutual inductance parameter of coupling loop of wireless power transmission system |
-
2018
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110108937A (en) * | 2019-05-10 | 2019-08-09 | 中国电力科学研究院有限公司 | A kind of wireless charging frequency selection purposes method and system based on frequency analysis |
| CN110108937B (en) * | 2019-05-10 | 2023-03-14 | 中国电力科学研究院有限公司 | Wireless charging frequency selection method and system based on harmonic analysis |
| CN111413570A (en) * | 2020-04-26 | 2020-07-14 | 中铁电气化局集团有限公司 | Method and device for detecting mutual inductance parameter of coupling loop of wireless power transmission system |
| CN111413570B (en) * | 2020-04-26 | 2022-07-08 | 中铁电气化局集团有限公司 | Method and device for detecting mutual inductance parameter of coupling loop of wireless power transmission system |
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