CN206537162U - A kind of efficient wireless electric vehicle charging device of Low emissivity - Google Patents
A kind of efficient wireless electric vehicle charging device of Low emissivity Download PDFInfo
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- CN206537162U CN206537162U CN201720263765.3U CN201720263765U CN206537162U CN 206537162 U CN206537162 U CN 206537162U CN 201720263765 U CN201720263765 U CN 201720263765U CN 206537162 U CN206537162 U CN 206537162U
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- 238000007600 charging Methods 0.000 title claims abstract description 62
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- 238000010295 mobile communication Methods 0.000 claims description 5
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- 230000005855 radiation Effects 0.000 description 7
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- 230000000977 initiatory effect Effects 0.000 description 5
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- 230000002159 abnormal effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
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Abstract
The utility model discloses a kind of efficient wireless electric vehicle charging device of Low emissivity, including：Primary side transmitting terminal and secondary receiving terminal, primary side transmitting terminal include：Control module, drive circuit, resonance coupling module, voltage signal Shaping Module, primary side telecommunication circuit, current rectifying and wave filtering circuit and external power supply, control module include primary side single-chip microcomputer and control signal generation circuit；Drive circuit is connected with control signal generation circuit；Resonance coupling module includes the Capacity control access circuit being connected with each other and transmitting coil, and Capacity control access circuit is connected with primary side single-chip microcomputer；Transmitting coil has first end, the second end and the 3rd end；Voltage signal Shaping Module includes original edge voltage waveform shaping circuit and original edge voltage amplitude change-over circuit, and voltage signal Shaping Module is connected to primary side single-chip microcomputer；Primary side telecommunication circuit is connected with the primary side single-chip microcomputer in control module, the transmitting coil in resonance coupling module respectively, and amplifying circuit and frequency-discriminating circuit are provided with primary side telecommunication circuit.
Description
Technical field
The utility model is related to wireless charging field, more particularly to a kind of efficient electric automobile wireless charging Denso of Low emissivity
Put.
Background technology
Wireless charging is a kind of technology that energy is sent to electricity consumption receiving terminal using inductive by power supply transmitting terminal,
It is exactly the Wireless transceiver that electric energy is not realized by line in kind.WPC (Wireless Power Consortium wireless chargings Electricity Federations
Alliance) standard define wireless charging system three main aspects be to provide electric energy power transmitter (i.e. above-mentioned transmitting terminal),
Use the communication protocol between the power receiver (i.e. above-mentioned receiving terminal) of electric energy and both equipment.Wherein, electric power is sent
The Key Circuit of device includes transmitting the primary coil of electric energy to electricity consumption end, drives the control unit of primary coil, and communication electricity
Road.The Key Circuit of power receiver includes receiving the secondary coil of electric energy, rectification circuit, rechargeable battery and telecommunication circuit.
When it is implemented, transmitting termination power is embedded in into ground, receiving terminal is arranged on automobile, only need to be by car during charging
Specified charge position is reached, receiving coil is located at directly over transmitting coil, now transmitting terminal becomes with receiving terminal equivalent to mutual inductance
The primary and secondary side of depressor, it is then artificial to send charge initiation and terminate to order.
At present, the wireless charging mode applied to electric automobile mainly has induction and resonance manifold type.Electromagnetism sense
Answer that the wireless charging of formula utilizes is electromagnetic induction principle, and primary coil connects power supply, and the current induced magnetic field of change utilizes transformation
Electric energy is sent to secondary circuit by device coupling.But the electric energy transmission range of the wireless charging mode is shorter, and to primary coil and
The position deviation of secondary coil is very sensitive, therefore is not suitable for the wireless charging of electric automobile.The wireless charging of resonance manifold type
Power technology and induction difference be resonance manifold type wireless charging technology on the inductance of primary coil simultaneously
Join electric capacity formation resonant tank, while receiving loop what electricity consumption receiving terminal also constituted same resonant frequency, utilize two resonant bodies
Between the strong magnetic coupling that is formed realize efficient electric energy transmission.The wireless charging technology electric energy transmission range of resonance manifold type
Farther out, efficiency of transmission is higher, is particularly suited for the wireless charging of electric automobile.But this technology also has many problems, such as work as
During relative position deviation larger (also abbreviation such case is misalignment) of primary coil and secondary coil, transmitting terminal circuit will not
In resonant condition, efficiency of transmission declines, and the relatively intense radiation of generation can damage the healthy of passenger, to the electromagnetism of surrounding
Signal is interfered.
Transmitting terminal and receiving terminal circuit intrinsic frequency are all：
L therein is that to be the inductance value of circuit in itself be superimposed total inductance amount with mutual induction amount.Control signal generation circuit is produced
Raw square-wave signal is made up of fundamental wave and many multiple harmonics, fundamental frequency and the intrinsic frequency phase for launching terminal circuit
Together, then transmitting terminal circuit reaches resonant condition, is retained with intrinsic frequency identical fundamental wave, other multiple and higher hamonic wave quilts
Suppress, realize frequency-selecting, producing the preferable sine wave of waveform is used to transmit electric energy.But under actual conditions, primary coil and pair
The position deviation of sideline circle is inevitable, and now mutual inductance reduces, and 1. the L in formula reduces, and intrinsic frequency is improved, if control unit is produced
Raw signal frequency is constant, then launches terminal circuit and be unsatisfactory for resonant condition, fundamental signal obtains a certain degree of suppression, transmitting terminal
Circuit charge efficiency is reduced, and the suppression to harmonic wave weakens, and these harmonic waves not being suppressed scatter to aerial formed and radiated, and damage
The healthy of passenger is done harm to, other electromagnetic signals in surrounding air are interfered.Therefore, the effect of wireless charging is improved
Rate becomes the focus of Recent study, but the radiation produced during reduction charging does not cause the attention of people also, if radiation
Problem is not solved, and will be had a strong impact on the practicality of wireless charging technology, is hindered the popularization of the technology.
At present, some scholars propose the method by mounting and positioning device, i.e., install Magnetic Sensor in primary circuit, receive
The magnetic signal of secondary coil moves primary side to judge the position deviation between primary coil and secondary coil according to this position deviation
Coil is aligned until with secondary coil, to reduce the position deviation between primary coil and secondary coil, reaches raising charging effect
The purpose of rate reduction radiation.But this method implements more difficulty, and one is, is embedded in the charging end of underground and needs position to move
It is dynamic, it is therefore desirable to which that the underground space of occupancy is larger, and charging terminal circuit and power supply are wired connection, long-term mobile charging end electricity
Road equally exists potential safety hazard；Two are, if wanting to reduce the position deviation between former, breadths coil, the mobile side of primary circuit
To not just all around four direction, but multidirectional movement is needed, so the laying problem of its track also is difficult to solve.
Based on problems described above, a kind of efficient wireless electric vehicle charging device of Low emissivity is badly in need of in this area.
Utility model content
In order to overcome the defect of prior art, a kind of Low emissivity of the utility model offer, adaptive ability are strong, charge efficiency
High wireless electric vehicle charging device, it includes：Primary side transmitting terminal and secondary receiving terminal, the primary side transmitting terminal include：Control
Molding block, drive circuit, resonance coupling module, voltage signal Shaping Module, primary side telecommunication circuit, current rectifying and wave filtering circuit and outer
Power supply is connect, wherein, the control module includes the primary side single-chip microcomputer and control signal generation circuit being connected with each other；The driving electricity
Road is connected with the control signal generation circuit in the control module, and two fields altogether are provided with the drive circuit
Effect pipe；The resonance coupling module includes the Capacity control access circuit being connected with each other and transmitting coil, the Capacity control
Access circuit is connected with the primary side single-chip microcomputer；The transmitting coil has first end, the second end and the 3rd end, described first
End connects the drive circuit, the voltage signal Shaping Module respectively；Second end connects the drive circuit, original respectively
Side telecommunication circuit；3rd end is that the first end and described second rectify middle tap, passes through a balance inductance and connects
The current rectifying and wave filtering circuit is connected to, external power supply is connected further to, received from outside electric power；The Capacity control access
Circuit in parallel is between the first end and the second end；The first end and the second end are also respectively connected with the drive circuit
Two FETs；The voltage signal Shaping Module includes original edge voltage waveform shaping circuit and original edge voltage amplitude conversion electricity
Road, the voltage signal Shaping Module is connected to the primary side single-chip microcomputer in the control module, and by transmitting coil first
The waveform at end and the information transmission of voltage swing are to the primary side single-chip microcomputer；The primary side telecommunication circuit respectively with the control mould
The transmitting coil in the primary side single-chip microcomputer, the resonance coupling module in block is connected, and is set in the primary side telecommunication circuit
There are amplifying circuit and frequency-discriminating circuit；Rectifier bridge and electric capacity are provided with the current rectifying and wave filtering circuit.
On the basis of above-mentioned technical proposal, the utility model can also do following improvement.
Further, the secondary receiving terminal includes：Secondary single-chip microcomputer, secondary telecommunication circuit, receiving coil, automobile charging
Circuit, voltage detecting circuit and display screen, wherein, the secondary single-chip microcomputer, the secondary telecommunication circuit, the reception line
Circle, the automobile charging circuit and the voltage detecting circuit are sequentially connected, the voltage detecting circuit and the display screen
It is respectively connecting to the secondary single-chip microcomputer.
Further, the receiving coil of secondary receiving terminal is adapted to the transmitting coil coupling of primary side transmitting terminal.
Further, in the automobile charging circuit be provided be used for store electric energy, rechargeable battery for car use.
Further, in addition to mobile communication module, the mobile communication module is connected to the institute in the control module
State primary side single-chip microcomputer.
The beneficial effects of the utility model are：Low emissivity, adaptive ability are strong, charge efficiency is high.
Brief description of the drawings
Fig. 1 is the system construction drawing of wireless electric vehicle charging device of the present utility model；
Fig. 2 is the circuit structure diagram of wireless electric vehicle charging device of the present utility model；
Fig. 3 is the waveform diagram of each point in Fig. 2；
Fig. 4 is the oscillogram in the case of original edge voltage amplitude is excessive in the embodiment；
Oscillogram unmodified when being different leakage field degree in the embodiment Fig. 5；
Oscillograms of Fig. 6 when being different leakage field degree in the embodiment by amendment；
Fig. 7 is the oscillogram of F points and B points under different leakage field degree in the embodiment；
Fig. 8 is the oscillogram of G points and B points under different leakage field degree in the embodiment；
In the accompanying drawings, the list of designations represented by each label is as follows：
100 --- control module；101 --- primary side single-chip microcomputer；102 --- control signal generation circuit；200 --- driving
Circuit；300 --- resonance coupling module；301 --- Capacity control accesses circuit；302 --- transmitting coil；400 --- voltage
Signal shaping module；500 --- primary side telecommunication circuit；600 --- current rectifying and wave filtering circuit；700 --- mobile communication module；
801 --- secondary single-chip microcomputer；802 --- secondary telecommunication circuit；803 --- receiving coil；804 --- automobile charges
Circuit；805 --- voltage detecting circuit；806 --- display screen.
Embodiment
Principle of the present utility model and feature are described below in conjunction with accompanying drawing, example is served only for explaining this practicality
It is new, it is not intended to limit scope of the present utility model.
Please also refer to shown in Fig. 1 and Fig. 2, Fig. 1 is the system architecture of wireless electric vehicle charging device of the present utility model
Figure；Fig. 2 is the circuit structure diagram of wireless electric vehicle charging device of the present utility model；The wireless electric vehicle charging device
Including：Primary side transmitting terminal and secondary receiving terminal, wherein,
The primary side transmitting terminal includes：Control module 100, drive circuit 200, resonance coupling module 300, voltage signal are whole
Shape module 400, primary side telecommunication circuit 500, current rectifying and wave filtering circuit 600 and external power supply (not shown), wherein,
The control module 100 includes the primary side single-chip microcomputer 101 and control signal generation circuit 102 being connected with each other；
The drive circuit 200 is connected with the control signal generation circuit 102 in the control module 100, institute
State and two FET N1, N2 altogether are provided with drive circuit 200；
The resonance coupling module 300 includes the Capacity control access circuit 301 being connected with each other and transmitting coil 302, institute
Capacity control access circuit 301 is stated with the primary side single-chip microcomputer 101 to be connected；The transmitting coil 302 has first end, second
End and the 3rd end, the first end connect the drive circuit 200, the voltage signal Shaping Module 400 respectively；Described second
End connects the drive circuit 200, primary side telecommunication circuit 500 respectively；3rd end is the first end and second end
The tap of middle, is connected to the current rectifying and wave filtering circuit 600 by a balance inductance, is connected further to external power supply,
Receive from outside electric power；The Capacity control access circuit 301 is parallel between the first end and the second end；Described
One end and the second end are also respectively connected with FET N1, N2 in the drive circuit 200；
The voltage signal Shaping Module 400 includes original edge voltage waveform shaping circuit and original edge voltage amplitude conversion electricity
Road, because the two circuits are this area conventional design, so not shown in figure, also repeat no more herein；The voltage signal
Shaping Module 400 is connected to the primary side single-chip microcomputer 101 in the control module 100, and by waveform and the letter of voltage swing
Breath is sent to the primary side single-chip microcomputer 101；
The primary side telecommunication circuit 500 respectively with the primary side single-chip microcomputer 101 in the control module 100, described humorous
The transmitting coil 302 shaken in coupling module 300 is connected, provided with amplifying circuit and frequency discrimination electricity in the primary side telecommunication circuit 500
Road；
Provided with rectifier bridge and electric capacity (category conventional design is not drawn into) in the current rectifying and wave filtering circuit 600, as shown in Fig. 2 C6,
C7, C8 electric capacity parallel circuit can play a part of to power filter, and L is used as the balance inductance for accessing termination power；
Furthermore it is preferred that setting a mobile phone communication module 700, the mobile communication module 700 is connected to the control module
The primary side single-chip microcomputer 101 in 100；Power consumption that primary side single-chip microcomputer is produced when can also be by the charging of record and electric automobile
The information such as ID accounts are sent to charge information administrative center and realize the functions such as Online Payment, make the charging process of electric automobile more
Easy and hommization.
The secondary receiving terminal includes：Secondary single-chip microcomputer 801, secondary telecommunication circuit 802, receiving coil 803, automobile charging
Circuit 804, voltage detecting circuit 805 and display screen 806, wherein, the secondary single-chip microcomputer 801, the secondary telecommunication circuit
802nd, the receiving coil 803, the automobile charging circuit 804 and the voltage detecting circuit 805 are sequentially connected, the electricity
Pressure detection circuit 805 and the display screen 806 are respectively connecting to the secondary single-chip microcomputer 801；The receiving coil 803 and primary side
The coupling adaptation of the transmitting coil 302 of transmitting terminal；Being provided with the automobile charging circuit 804 is used to store electric energy, steam supply car
The rechargeable battery used；
Pass through receiving coil and transmitting coil between the primary side telecommunication circuit 500 and the secondary telecommunication circuit 802
Coupling is communicated；Through the secondary telecommunication circuit 802, receiving coil 803, described after the elder generation of secondary single-chip microcomputer 801
Transmitting coil 302, the primary side telecommunication circuit 500 are by the information transfers such as charge initiation signal, automobile ID accounts to the primary side
Single-chip microcomputer 101.
Control signal generation circuit produce square-wave signal (hereinafter referred to as control signal) be by fundamental wave and it is many repeatedly
Harmonic wave composition, FET is nonlinear device, and its output signal ratio input signal has the frequency content of more horn of plenty, because
This control signal will produce the various high-frequency harmonics more than control signal frequency more horn of plenty after FET drives.When
Between secondary coil and primary coil during existence position deviation, the mutual inductance between former and deputy sideline circle reduces, and leakage field increases, i.e., public
Formula 1. in L reduce, the intrinsic frequency f of resonance circuit0Improve, the fundamental frequency of the signal exported with control signal generation circuit
There is deviation, circuit is not at resonant condition, and fundamental signal obtains a certain degree of suppression, transmitting terminal circuit charge efficiency drop
Low, the suppression to various harmonic waves weakens, and these harmonic waves not being suppressed scatter to aerial formed and radiated, and damage passenger
It is healthy, disturb around electromagnetic signal.As shown in fig. 7, F is the drive circuit output end electricity of any in one embodiment
Corrugating, B is the control signal generation circuit output end voltage waveform of any in above-described embodiment, when a figures are leakage field 1%, F points
With the oscillogram of B points, now preferably, noise is few, it is believed that now the voltage of F points B points is without phase deviation for F points voltage waveform
(phase difference showed in figure is due to the fixed difference that characteristic of the output of FET with inputting is formed)；B figures are leakage
There is phase difference in the oscillogram of F points and B points during magnetic 5%, now, the voltage of B points and F points, and making an uproar on a small quantity occurs in F points voltage waveform
Sound；C figures are the oscillogram of F points and B points when leakage field is 10%, and now, the voltage phase difference of B points and F points becomes apparent from, F point voltages
There are more noises in waveform, and d figures are the oscillogram of F points and B points when leakage field is 50%, and now, the voltage waveform of F points is seen substantially
Not out.
In order to reduce radiation, ensure charge efficiency, primary circuit needs to be maintained at resonant condition.It is single in the utility model
The access amount that piece machine can change electric capacity in resonance circuit according to leakage field degree makes circuit keep resonant condition.Wherein leakage field degree
Can by control signal generation circuit output end voltage and the voltage (2 points of F, B voltage in Fig. 7) of drive circuit output end
Between phase difference reflection and represent, the voltage-phases of two voltages then by voltage signal Shaping Module (by divider resistance, voltage with
Constituted with device, low pass filter, zero passage voltage comparator etc.) detect in real time and detection data are sent to primary side monolithic in real time
Machine, primary side single-chip microcomputer judges leakage field degree according to the detection data, then sends the corresponding Capacity control access electricity of order control
Road, makes circuit keep resonant condition.
Assuming that the voltage at primary side transmitting coil two ends is V1, secondary receiving coil two ends voltage be V2, automobile charging circuit
In rechargeable battery both end voltage be that E, secondary load resistance are R, the primary current when secondary current is zero is i1, secondary electricity
Flow for i2。
(1) when charging has just started, cell voltage E is smaller, by formula
Understand i2It is larger, because the electric current that secondary coil is coupled to primary coil is and primary coil electric current i1Reverse, now
The electric current i of primary coil1-i2It is smaller, then original edge voltage V1It is relatively small, it is necessary to improve original by increasing the dutycycle of PWM ripples
Polygonal voltage V1。
(2) simply by the presence of leakage field, the voltage that primary side is coupled to secondary will be reduced, it is likely that occur that secondary obtains fills
Piezoelectric voltage is unsatisfactory for the situation of charging requirement, and now secondary voltage detection circuit (detects charging voltage, also detects cell voltage
State) the electric voltage exception situation detected by telecommunication circuit will be sent to primary side single-chip microcomputer, change PWM ripple dutycycles,
Improve original edge voltage.Above-mentioned two situations are required to increase original edge voltage V1, but original edge voltage increases always, is possible to go out
Waveform now as shown in Figure 4, i.e. voltage are excessive, cause voltage signal minimum point zero crossing phenomenon occur, at this moment high-power N-channel
FET reverse-conducting, reduces the service life of FET.Above-mentioned to avoid the occurrence of, the utility model is provided with
Voltage signal Shaping Module, for detecting the change of original edge voltage amplitude in real time and detection data being sent into primary side monolithic in real time
Machine.When detecting V1When signal is excessive, reduce the dutycycle for the PWM ripples that primary side single-chip microcomputer is exported to ensure original edge voltage only
Height, to eliminate circuit safety hidden danger.
(3) in charging process, E is improved constantly, when battery soon full of when, 2. in E it is larger, then i2It is smaller, primary side line
The electric current i of circle1-i2It is larger, V1It is larger, then V2It is larger, but now battery is full of soon, V2It is excessive to have initiation battery explosion
Danger.To ensure charging safety, the voltage detecting circuit of secondary is detected when there are abnormal conditions, and secondary single-chip microcomputer sends life
Order, primary side single-chip microcomputer is sent to by telecommunication circuit, and primary side single-chip microcomputer changes the dutycycle of PWM ripples, controls original edge voltage.
In summary, it is reduction charging radiation, realizes the high efficiency of transmission of electric energy, it is necessary to draw and be stored in by experiment in advance
Some data of single-chip microcomputer.As shown in Fig. 2 certain in charged battery voltage, the PWM ripples dutycycle of primary side single-chip microcomputer output is certain
Under the premise of, during a variety of leakage field level states, the voltage between (1) control signal generation circuit output end and drive circuit output end
(there is phase difference with the voltage of F points, the phase difference is that circuit problem causes, and is one in phase difference, in the following embodiments, i.e. G points
Definite value, does not influence to calculate) (it is denoted as respectively with the voltage phase differences of B points) and it is now corresponding
Primary circuit keep resonance need access capacitance；(2) peak value of original edge voltage (is denoted as Vm0、Vm1、Vm2……Vmn).Will
Above-mentioned two groups of numerical value is stored in primary side single-chip microcomputer, the phase difference measured during for charging normalWith voltage peak VmMake comparisons.
The circuit of resonance coupling module can cause forceful electric power to disturb in the circuit of control module, therefore in design control module electricity
, it is necessary to strengthen interference protection measure during source circuit.
Incorporated by reference to shown in Fig. 1 and Fig. 2, charge initiation order and the ID IDs of itself, the life are sent by secondary single-chip microcomputer
Order is sent to primary side single-chip microcomputer by telecommunication circuit；Be in the present embodiment the order first modulated circuit carry out signal modulation,
Amplifying circuit carries out signal amplification, and secondary coil is coupled to through C5 coupled capacitors, then is coupled to primary coil by secondary coil, so
Amplifying circuit is coupled to by C4 coupled capacitors, most primary side single-chip microcomputer is transferred to through frequency-discriminating circuit afterwards.Wherein, C4, C5 electric capacity
It is worth very little, capacitive reactance is very big, on the one hand, influence will not be produced on charging voltage and charging current；On the other hand, due to brewed letter
The capacitive reactance of carrier frequency higher C4, C5 to modulated signal used in number is smaller, remains to play coupling.
Primary side single-chip microcomputer, which is connected to after charge initiation order, just to be started to start transmitting terminal circuit work, is provided for receiving terminal circuit
Electric energy, specific work process is as follows：(1) primary side single-chip microcomputer produces dutycycle and is twice in primary side resonance frequency less than 1/2 cycle, frequency
The PWM ripples of rate, waveform is as shown in the A waveforms in Fig. 3；(2) the PWM ripples realize two divided-frequency after d type flip flop, and signal waveform is such as
Q in Fig. 3,Shown in waveform；(3) realize that the signal after two divided-frequency passes through two with being changed into two-way duty behind the door with original PWM ripples
Than the signal less than a quarter cycle, waveform is as shown in the B in Fig. 3, E waveform；(4) above-mentioned two-way dutycycle be less than four/
The signal in one cycle controls high-power N-channel FET N1, N2 conducting and cut-off, N1 and N2 conducting as control signal
Control the inflow and cut-off of source current again with cut-off；(5) switch control of the source current flowed into two FETs N1, N2
System is lower to access circuit (by S1-1, S1-2, C1-1, C1-2 by transmitting coil L1, C, Capacity control；S2-1, S2-2, C2-1,
C2-2；Sn-1, Sn-2, Cn-1, Cn-2 composition) after the resonance circuit formed in parallel, transmitting terminal circuit just reaches resonant condition, electricity
Electric current in road is sufficiently large, disclosure satisfy that the intermediate frequency high current signal on charging requirement, primary coil is coupled by transformer T
To receiving coil, the receiving end that achieves a butt joint circuit efficiently charges.The present embodiment used when analog circuit is emulated PWM wave frequency rates for
170KHz, dutycycle are the square wave that 50%, amplitude is 5V；The power supply voltage of resonance circuit is 20V direct currents；With gate number
For 7408N；N-channel FET model IRF830.
As shown in Fig. 2 when existence position deviation between secondary coil and primary coil, it is mutual between former and deputy sideline circle
Sense reduces, and leakage field increases, i.e., L 1. in formula reduces, the intrinsic frequency f of resonance circuit0Improve, believe with the control that single-chip microcomputer is exported
Number fundamental frequency there is deviation, circuit is not at resonant condition, and now fundamental signal obtains a certain degree of suppression, transmitting terminal
Circuit charge efficiency is reduced, and the suppression to harmonic wave weakens, and these harmonic waves not being suppressed scatter to aerial formed and radiated.For
Reduction radiation, it is ensured that charge efficiency, circuit needs to be maintained at resonant condition.Primary circuit resonance is kept in the present embodiment
Specific method be primary side single-chip microcomputer according to leakage field degree send control signal control S1, S2 ... the on off state that Sn is switched is to change
The capacitance become in access resonance circuit, makes circuit be in resonant condition.For example, the dutycycle of PWM ripples is in the present embodiment
50%：Under 5% leakage field state, closure switch S1-1, S1-2 can allow primary circuit not off resonance；Under 10% leakage field state, close
Combination switch S1-1, S1-2, S2-1, S-2 can allow primary circuit not off resonance.As shown in figure 5, represent successively from top to bottom is 0%,
5%th, the waveform without above method amendment under 10%, 15%, 20%, 25%, 30%, 50% leakage field degree.Fig. 6 is from top to bottom
Represent successively under 0%, 5%, 10%, 15%, 20%, 25%, 30%, 50% leakage field degree after above method amendment
Waveform.
As shown in Fig. 2 the specific measuring method of leakage field degree is as follows in the present embodiment：Voltage signal, warp are obtained in F points
Exported after voltage signal Shaping Module to G points, G point voltage signals are input to primary side list simultaneously with the voltage signal taken out in B points
Piece machine, the phase difference obtained between 2 points is calculated by single-chip microcomputer, by the phase difference and the difference in deposit primary side single-chip microcomputer in advance
Phase difference under degree leakage field Make comparisons, you can judge leakage field degree now (i.e. between two coils
Position deviation).The signal collected in F points is after voltage signal Shaping Module, and fundamental frequency signal is converted to square wave, harmonic wave letter
Number it is inhibited.Fig. 7 provides the oscillogram of B points as shown in Figure 2 and F points.In Fig. 8, G when a figures are magnetic leakage free state
The oscillogram of point and B points；B figures are the oscillogram of G points and B points when leakage field degree is 5%；C figures are G points when leakage field degree is 10%
With the oscillogram of B points, d figures are the oscillogram of G points and B points when leakage field degree is 50%.
For make circuit under above-mentioned situation (1), (2) can trouble free service, primary side single-chip microcomputer is by obtained original edge voltage peak
Value Vm, with there is the voltage peak V in the case of this in single-chip microcomputer kind leakage field in advancemnCompare.When detecting VmMore than VmnWhen, reduction
The dutycycle for the PWM ripples that primary side single-chip microcomputer is sent, changes the ON time of high-power N-channel FET, primary side is reduced with this
Voltage amplitude, to eliminate potential safety hazard in charging process；For make circuit in above-mentioned situation (3) can trouble free service, secondary
Rechargeable battery is connected with voltage detecting circuit, and battery charging voltage is detected in real time, and is shown on a display screen in real time, when detecting
When battery charging voltage is too high, secondary single-chip microcomputer sends order, and the order is sent to primary side single-chip microcomputer, primary side by telecommunication circuit
Single-chip microcomputer reduces the dutycycle of PWM ripples, reduces original edge voltage, it is ensured that charging safety.
Preferred embodiment of the present utility model is the foregoing is only, it is all in this practicality not to limit the utility model
Within new spirit and principle, any modification, equivalent substitution and improvements made etc. should be included in guarantor of the present utility model
Within the scope of shield.
Claims (5)
1. a kind of efficient wireless electric vehicle charging device of Low emissivity, including：Primary side transmitting terminal and secondary receiving terminal, its feature
It is,
The primary side transmitting terminal includes：Control module, drive circuit, resonance coupling module, voltage signal Shaping Module, primary side are led to
Believe circuit, current rectifying and wave filtering circuit and external power supply, wherein,
The control module includes the primary side single-chip microcomputer and control signal generation circuit being connected with each other；
The drive circuit is connected with the control signal generation circuit in the control module, is set in the drive circuit
There are two FETs altogether；
The resonance coupling module includes the Capacity control access circuit being connected with each other and transmitting coil, the Capacity control access
Circuit is connected with the primary side single-chip microcomputer；The transmitting coil has first end, the second end and the 3rd end, the first end point
The drive circuit, the voltage signal Shaping Module are not connected；Second end connects the drive circuit, primary side and led to respectively
Believe circuit；3rd end is that the first end and described second rectify middle tap, is connected to by a balance inductance
The current rectifying and wave filtering circuit, is connected further to the current rectifying and wave filtering circuit connection external power supply, receives from outside electric power；
The Capacity control accesses circuit in parallel between the first end and the second end；The first end and the second end are also respectively connected with
Two FETs in the drive circuit；
The voltage signal Shaping Module includes original edge voltage waveform shaping circuit and original edge voltage amplitude change-over circuit, the electricity
Pressure signal shaping module is connected to the primary side single-chip microcomputer in the control module, and by the waveform of transmitting coil first end and
The information transmission of voltage swing is to the primary side single-chip microcomputer；
The primary side telecommunication circuit respectively with the primary side single-chip microcomputer in the control module, the resonance coupling module
Transmitting coil is connected, and amplifying circuit and frequency-discriminating circuit are provided with the primary side telecommunication circuit；
Rectifier bridge and electric capacity are provided with the current rectifying and wave filtering circuit.
2. wireless electric vehicle charging device according to claim 1, it is characterised in that the secondary receiving terminal includes：
Secondary single-chip microcomputer, secondary telecommunication circuit, receiving coil, automobile charging circuit, voltage detecting circuit and display screen, wherein, institute
State secondary single-chip microcomputer, the secondary telecommunication circuit, the receiving coil, the automobile charging circuit and voltage detecting electricity
Road is sequentially connected, and the voltage detecting circuit and the display screen are respectively connecting to the secondary single-chip microcomputer.
3. wireless electric vehicle charging device according to claim 2, it is characterised in that the receiving coil of secondary receiving terminal
It is adapted to the transmitting coil coupling of primary side transmitting terminal.
4. wireless electric vehicle charging device according to claim 2, it is characterised in that set in the automobile charging circuit
Have for storing electric energy, rechargeable battery for car use.
5. the wireless electric vehicle charging device according to any one of Claims 1 to 4, it is characterised in that also including mobile phone
Communication module, the mobile communication module is connected to the primary side single-chip microcomputer in the control module.
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| CN201720263765.3U CN206537162U (en) | 2017-03-17 | 2017-03-17 | A kind of efficient wireless electric vehicle charging device of Low emissivity |
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| CN201720263765.3U CN206537162U (en) | 2017-03-17 | 2017-03-17 | A kind of efficient wireless electric vehicle charging device of Low emissivity |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107968461A (en) * | 2017-12-19 | 2018-04-27 | 北京师范大学珠海分校 | Wireless charging device and the method for automatically adjusting wireless charging device output voltage |
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2017
- 2017-03-17 CN CN201720263765.3U patent/CN206537162U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107968461A (en) * | 2017-12-19 | 2018-04-27 | 北京师范大学珠海分校 | Wireless charging device and the method for automatically adjusting wireless charging device output voltage |
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Granted publication date: 20171003 |