CN109278573B - Pure electric vehicle wireless charging method in static state based on beam forming principle - Google Patents

Pure electric vehicle wireless charging method in static state based on beam forming principle Download PDF

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CN109278573B
CN109278573B CN201811318349.4A CN201811318349A CN109278573B CN 109278573 B CN109278573 B CN 109278573B CN 201811318349 A CN201811318349 A CN 201811318349A CN 109278573 B CN109278573 B CN 109278573B
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electric vehicle
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康乐
黄宝英
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Changshu Institute of Technology
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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
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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
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • 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
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Abstract

The invention discloses a wireless charging method of a pure electric vehicle in a static state based on a beam forming principle, which is used for solving the defects that the existing wireless charging of the electric vehicle needs to be accurately parked at a specified position and a transmitting coil and a receiving coil need to be completely aligned. A plurality of charging coils are laid on the parking space, and a receiving coil is installed at the bottom of the electric automobile. When the electric automobile is parked above the parking space, the charging coil below the electric automobile wirelessly charges the electric automobile. The invention utilizes the beam forming control method to control the voltage/current of a plurality of charging coils, so that the receiving coils can be charged with high efficiency in a larger range, and the problem of high requirement on position precision of wireless charging of the automobile is solved. And the full automation of wireless charging and power failure of the electric vehicle is realized through an automatic control strategy.

Description

Pure electric vehicle wireless charging method in static state based on beam forming principle
Technical Field
The invention relates to the technical field of power electronics, in particular to a method for wirelessly charging a static pure electric vehicle.
Background
In the existing wireless charging technology of pure electric vehicles, usually a single charging coil is fixedly installed on a ground parking space, and a receiving coil on the electric vehicle must be accurately stopped at a specific position, so that the receiving coil on a chassis of the electric vehicle and a transmitting coil on the ground are in a position right opposite to each other to charge. If the receiving coil and the charging coil of the electric automobile chassis are staggered in the whole charging process, the wireless charging efficiency is greatly reduced.
The invention discloses a method for charging a static pure electric vehicle by using a magnetic resonance type wireless electric energy charging technology of a beam forming principle. The method can remarkably expand the charging coverage of the charging coil, and the electric automobile can efficiently charge without making the receiving coil completely opposite to the charging coil. As long as the automobile is stopped in the wider charging range, the charging coil can efficiently transmit electric energy to the receiving coil.
Disclosure of Invention
1. Objects of the invention
In order to overcome the above-mentioned drawbacks of the prior art, a first object of the present invention is to solve the problem that the charging coverage can be enlarged; the second purpose is to solve the problem of energy waste caused by the fact that the charging coil still works when the parking space is idle, and therefore the wireless charging method of the pure electric vehicle in the static state based on the beam forming principle is provided.
2. The technical scheme adopted by the invention
In order to expand the charging coverage, the invention provides a pure electric vehicle wireless charging method in a static state based on a beam forming principle, which comprises the following steps of:
step 1, uniformly installing a charging array consisting of a plurality of charging coils below a parking space and in the middle of the parking space; the charging coil obtains the modulated electric energy from the power transmission bus through the voltage/current converter; the receiving coil is arranged on a chassis of the pure electric vehicle, and the size of the receiving coil is determined by the area of the chassis of the electric vehicle;
step 2, applying independent alternating current to each charging coil, and measuring the initial voltage V in the current coil by the voltage and current detection device in the coilT1…VTnCurrent information I1…In；
Step 3, calculating mutual inductance M between the charging coilsik(i ≠ k), total Cn 2The method comprises the following steps:
Mikdisconnecting the voltage source in the kth coil to form an open circuit for the mutual inductance of the ith and kth charging coils;
when a voltage V is applied to the coil iTiThen, resonant coupling is formed between the two coils, although the coil k is open-circuited, the current on the coil k is I k0, but the pressure drop at the break can still be measured and is denoted as VTkThus, there are:
Figure GDA0003140999270000021
step 4, the total impedance of the receiving coil is a preset value, but the value of the impedance is changed due to the internal resistance change of the rechargeable battery pack; therefore, an impedance matching device is added between the receiving coil and the battery pack;
step 5, listing the following kirchhoff matrix equation based on the charging model in the steps 1 and 2:
Figure GDA0003140999270000022
in the matrix equation, ZiRepresents the total impedance of the ith charging coil, ZRRepresenting the total impedance of the receiving coil, IRRepresenting electricity at the receiving coilA stream; because the whole wireless charging system always works in a resonance state, the capacitance and the inductance in the coil are balanced out, and the circuit becomes resistive, ZR＝jωLR+1/jωCR+RL＝RL，RLRepresenting that the load branch at one side of the receiving coil contains the load of electricity;
step 6, substituting the parameters obtained in the steps 2, 3 and 4 into the kirchhoff matrix equation to obtain the mutual inductance value M of the charging coil and the receiving coil1…M1n；
Step 7, processing the mutual inductance value M by applying the beam forming wireless charging algorithm1…Mn，Mi(1≤i≤n)，MnIs the mutual inductance between the nth charging coil and the receiving coil:
step 7.1, setting parameter miSimultaneously order
Figure GDA0003140999270000023
Step 7.2, setting parameter betaiLet us order
Figure GDA0003140999270000024
Wherein
Figure GDA0003140999270000025
And miAre complex conjugates of each other, denominator
Figure GDA0003140999270000026
Is represented by m1To mnThe sum of the squares of the absolute values of; beta is aiDimensionless, for adjusting the coefficient of current in the charging coil;
step 7.3, using betaiMultiplying by the initial current value I in the corresponding charging coiliTo obtain betaiIi，βiIiI.e. the amount of current that should be passed to the charging coil i to achieve maximum efficiency charging.
Step 7.4, new current betaiIiThe ith charging time for realizing the maximum charging efficiency can be obtained by substituting the ith row of the kirchhoff matrix equation againInput voltage value V of electric coilTi；
Repeating the operation of the step 7.1 to the step 7.4 to obtain the optimal voltage value V of all the charging coilsT1…VTnAnd loading the optimal voltage value on a corresponding charging coil, wherein the whole wireless charging is in the maximum efficiency state.
In order to save energy, the method further comprises the step 8 of controlling the charging coil:
step 8, in order to save energy, the full-automatic wireless charging and power-off operation of the electric vehicle is completed, and the following control strategies are added at the charging coil to realize automation:
and 8.1, when no vehicle exists in the parking space, the charging coil is not coupled with the receiving coil, and the current in the charging coil is large. At the moment, after the current detection device detects a larger current, the transmission system is closed, and charging is stopped;
step 8.2, when the electric vehicle needs to be charged, the receiving coil is coupled with the transmitting coil, and the current in the charging coil is reduced; at the moment, the current detection device detects that the current is low, and starts to transmit the system and start to charge;
8.3, when the electric vehicle is full, the circuit protection device in the receiving coil is disconnected, so that the receiving coil is open-circuited; the current in the charging coil is increased, and at the moment, after the current detection device detects a larger current, the transmission system is closed, and the charging is stopped;
8.4, when the electric vehicle drives away from the parking space, the receiving coil leaves, and the current in the charging coil is increased; at this time, after the current detection device detects a large current, the transmission system is closed, and charging is stopped.
In step 4, the impedance matching device is composed of a Buck-Boost circuit, and the working state of the circuit can be changed by changing the duty ratio D of the MOS tube, so that the input impedance of the Buck-Boost circuit is changed, and the total impedance Z is further changedR；
The control equation is:
Figure GDA0003140999270000031
furthermore, the size of the charging coil is determined by the size of the actual parking space, and the diameter of the charging coil is not less than 1 meter.
3. The invention has the advantages of
(1) This a plurality of charging coils of installation in parking stall below expand the charging range, have voltage/current detection device in every charging coil. The method provided by the invention is used for estimating mutual inductance, then the obtained mutual inductance is used for carrying out beam forming operation to obtain the value of each charging current corresponding to the current maximum efficiency transmission, and finally the calculated current is applied to the corresponding charging coil, so that the maximum efficiency of the wireless charging of the pure electric vehicle is realized.
(2) The invention can ensure that the pure electric vehicle charged wirelessly can finish high-efficiency charging without accurately stopping right above the charging coil but in a larger charging area, solves the problem that the efficiency of the traditional wireless charging system is extremely sensitive to the dislocation of the relative positions between the coils, and ensures that the wireless charging system is more conveniently used in the actual parking space.
(3) The invention provides a wireless charging full-automatic control strategy, so that whether charging is needed or not is automatically judged by a charging coil according to the current condition, and the problem of energy waste caused by the fact that the charging coil still works when a parking space is free is solved.
Drawings
FIG. 1 is a schematic diagram of a pure electric vehicle during stationary wireless charging;
FIG. 2 is a schematic circuit diagram of a multi-charging coil/single-receiving coil wireless charging;
FIG. 3 shows mutual inductance M between transmitting terminalsikA schematic circuit diagram of a calculation method;
FIG. 4 is a schematic diagram of an impedance-matched Buck-Boost circuit;
FIG. 5 is a diagram showing the relationship between the control flow of the wireless charging automatic control method and the circuit of the transmitting coil;
FIG. 6 is a schematic diagram of the relative position of a 5 charging coil/single receiving coil wireless transmission system;
FIG. 7 is a schematic diagram showing the transmission efficiency of a 5-charge coil wireless transmission system when a receiving coil is at different positions;
fig. 8 is a schematic comparison graph of transmission efficiency of a wireless transmission system with a single charging coil when the receiving coil is at different positions.
Detailed Description
Example 1
The invention relates to a method for charging a pure electric vehicle in a static state by using a magnetic resonance type wireless electric energy charging technology based on a beam forming principle, which is characterized by comprising the following steps of:
step 1, a charging array composed of a plurality of charging coils is uniformly installed below a parking space, a receiving coil is installed on a chassis of a pure electric vehicle, and the size of the receiving coil is determined by the area of the chassis of the electric vehicle.
And 2, each charging coil is provided with an independent variable alternating current voltage source and a voltage/current detection device. An independent alternating voltage with a specific amplitude/phase is pre-applied to each charging coil, an electromagnetic field is generated around the charging coil, and the amplitude and phase of the current and voltage in the charging coil can be detected by the detection device in real time. When receiving coil gets into in the produced electromagnetic field of charging coil, can produce mutual inductance between charging coil and the receiving coil according to the electromagnetic induction principle, and mutual inductance can change the phase place and the amplitude of electric current in the charging coil.
And 3, solving the mutual inductance between the charging coils.
And 4, adjusting the impedance of the receiving coil by using an impedance matching circuit so that the impedance of the receiving end is always a known fixed value.
And 5, substituting the parameters (voltage and current on the charging coil, mutual inductance between the charging coils and impedance of the receiving coil) obtained in the steps 2, 3 and 4 into a kirchhoff matrix equation to obtain the mutual inductance between the charging coil and the receiving coil:
Figure GDA0003140999270000051
and 6, after the mutual inductance value is obtained through calculation, the voltage and the current which can obtain the previous maximum transmission efficiency in the current state can be obtained by utilizing the beam forming algorithm provided by the invention. The voltage value is loaded into the charging coil, so that the optimal wireless transmission efficiency can be achieved.
Step 7, in order to save energy, the full-automatic wireless charging and power-off operation of the electric vehicle is completed, and the following control strategies are added at the charging coil to realize automation:
and 7.1, when no vehicle exists in the parking space, the charging coil is not coupled with the receiving coil, and the current in the charging coil is large. At this time, after the current detection device detects a large current, the transmission system is closed, and charging is stopped.
And 7.2, when the electric vehicle needs to be charged, the receiving coil is coupled with the transmitting coil, and the current in the charging coil is reduced. At this time, the current detection device detects that the current is low, and starts to transmit the system and start charging.
And 7.3, when the electric vehicle is full, the circuit protection device in the receiving coil is disconnected, so that the receiving coil is opened. The current in the charging coil becomes large. At this time, after the current detection device detects a large current, the transmission system is closed, and charging is stopped.
And 7.4, when the electric vehicle drives away from the parking space, the receiving coil leaves, and the current in the charging coil becomes large. At this time, after the current detection device detects a large current, the transmission system is closed, and charging is stopped.
Example 2
The specific embodiment consisting of n charging coils and 1 receiving coil is shown in fig. 1, which is a structural diagram of the wireless charging method of the pure electric vehicle in a static state based on the beam forming principle.
The charging steps are as follows:
step 1, FIG. 2 is a schematic diagram of a basic circuit of wireless charging, wherein VTiAnd VTj(i ≠ j) represents the voltage source of the ith and jth charging coils, respectively, Ci、Li、Ri、IiAnd Cj、Lj、Rj、IjRespectively representing the capacitance, the inductance, the resistance and the current of the response charging coil; the parameters of the receive coil part are the same. After the wireless charging system is designed, the values of the capacitor, the inductor and the resistor in all the coils are known quantities. Mi、MjRespectively representing mutual inductance values between the ith charging coil and the jth charging coil and the receiving coil; mijIs the mutual inductance between the two charging coils.
And 2, applying independent alternating current to each charging coil, and detecting the current information of the current voltage and current in the coil by using a voltage and current detection device in the coil.
And 3, solving the mutual inductance between the charging coils. After the design of charging coil was accomplished and was installed underground, the relative position between electric parameter and the coil such as electric capacity, inductance of charging coil all in order fixed. It is easy to know that the mutual inductance between the resonance coils is related only to their electrical structure and relative position, so the mutual inductance M between the charging coils in step 3ik(i ≠ k) is also constant and can be calculated. As shown in fig. 3, the calculation method is as follows:
step 3.1, take the ith and kth charging coils as examples, its mutual inductance can be written as Mik(i ≠ k). The voltage source in the kth coil is disconnected, creating an open circuit as shown.
Step 3.2, when the coil i is loaded with the voltage VTiThen, resonant coupling is formed between the two coils, and j ω L +1/j ω C is satisfied in a resonant state as 0. Although coil k is open, the current on coil k is Ik0, but the pressure drop at the break can still be measured and is denoted as VTkThus, there are:
VTi＝IiZi
VTk＝jωMikIi
two formulas are obtained simultaneously:
Figure GDA0003140999270000071
all variables on the right hand side of the formula can be measured, so MikThis equation can be used to obtain the target.
Step 4, receiving the total impedance Z of the coilRMust be a known quantity and preferably a fixed value, but the value of the impedance changes due to changes in the internal resistance of the rechargeable battery. An impedance matching device is therefore added between the receiver coil and the battery pack as shown in figure 4. The device consists of a Buck-Boost circuit, and can change the working state of the circuit by controlling the duty ratio D of an MOS tube, thereby changing the input impedance of the Buck-Boost circuit and further changing the total impedance ZR. The control equation is:
Figure GDA0003140999270000072
and 5, obtaining the mutual inductance between the charging coil and the receiving coil. The following kirchhoff matrix equations can be listed according to fig. 2:
Figure GDA0003140999270000073
because the whole wireless charging system always works in a resonance state, the capacitance and the inductance in the coil are balanced out, and the circuit becomes resistive, Z in the matrix equationiRepresents the total impedance of the ith charging coil, ZRRepresenting the total impedance of the receive coil. And (4) substituting the results of the step (2), the step (three) and the step (four) to obtain the mutual inductance M between the charging coil and the receiving coil.
Step 6, applying the obtained mutual inductance value (M)1…Mn) And calculating the maximum efficiency of the beam forming wireless charging. With mutual inductance M between the ith charging coil and the receiving coili(M1<Mi<Mn) For example, the following steps are carried out:
step 6.1, setting parameter miSimultaneously order
Figure GDA0003140999270000074
Step 6.2, setting parameter betaiLet us order
Figure GDA0003140999270000081
Wherein
Figure GDA0003140999270000082
And miAre complex conjugates of each other, denominator
Figure GDA0003140999270000083
Is represented by m1To mnThe sum of squares of the absolute values of (a). It can be seen that betaiDimensionless, it is the coefficient that adjusts the current in the charging coil.
Step 6.3, using betaiMultiplying by the initial current value I in the corresponding charging coiliTo obtain betaiIi。βiIiIt is the amount of current that the charging coil i should be energized to achieve maximum efficiency charging.
Step 6.4, new current beta is addediIiSubstituting into the ith row in formula (1) again to obtain the voltage value V to be input to the ith charging coil for realizing the maximum charging efficiencyTi。
And 6.5, repeating the operation to obtain the optimal voltage value V of all the charging coilsT1…VTn. And loading the optimal voltage value on a corresponding charging coil, wherein the whole wireless charging is in the maximum efficiency state.
Step 7, in order to save energy, the full-automatic wireless charging and power-off operation of the electric vehicle is completed, and the following control strategies are added at the charging coil, as shown in fig. 5, so that automation is realized:
and 7.1, when no vehicle exists in the parking space, the charging coil is not coupled with the receiving coil, and the current in the charging coil is large. At this time, after the current detection device detects a large current, the transmission system is closed, and charging is stopped.
And 7.2, when the electric vehicle needs to be charged, the receiving coil is coupled with the transmitting coil, and the current in the charging coil is reduced. At this time, the current detection device detects that the current is low, and starts to transmit the system and start charging.
And 7.3, when the electric vehicle is full, disconnecting the circuit protection device in the receiving coil to open the receiving coil. The current in the charging coil becomes large. At this time, after the current detection device detects a large current, the transmission system is closed, and charging is stopped.
And 7.4, when the electric vehicle is driven out of the parking space, the receiving coil leaves, and the current in the charging coil is increased. At this time, after the current detection device detects a large current, the transmission system is closed, and charging is stopped.
In this embodiment, fig. 7 is a graph comparing a charging efficiency with a simulation result obtained by using the beam forming wireless transmission algorithm, and fig. 6 is a schematic circuit installation diagram of the simulation. As shown in fig. 6, the wireless charging device comprises 5 charging coils and 1 receiving coil, the resonant frequency is 1MHz, and the load R of the receiving coilLThe resistance is 5 omega, the internal resistance of the charging coil is 0.03 omega, the diameters of the 5 coils are all 1m, and the charging coil is in a resonance state under the resonance frequency, namely the coils are all pure resistive. To simulate the efficiency of the receiver coil at different positions, the receiver coil was slowly moved in a solid box with an area of 12 × 12m2. The box is parallel to the plane of the charging coil and has a height of 0.2m, and is used for simulating the height of the chassis of the automobile. The initial voltage value loaded on the charging coil is five random initial driving voltages 3+4i, 5-2i, 4-6i, 2.5+3i and 2-4.5 i.
Fig. 7 shows values of transmission efficiency of the receiving coil at different positions after applying the beamforming algorithm proposed by the present invention. It can be seen that 6X 6m is at the center2The transmission efficiency in the region (2) is as high as 95% or more. The beam forming algorithm is proved to realize the efficient transmission of wireless energy in a large range. Fig. 8 is a comparison graph of the efficiency of wireless transmission by a single charging coil, and it can be seen that the interval range of the high efficiency in the single coil is far smaller than the case of the beam forming 5 coils. The comparison proves that the multi-coil wireless charging beam forming algorithm system provided by the invention can effectively enlarge the high-efficiency charging space, overcomes the transmission loss caused by the dislocation of the coils, and enables the parking and charging of the electric vehicle to be more leisurely.

Claims (4)

1. A pure electric vehicle wireless charging method in a static state based on a beam forming principle is characterized by comprising the following steps:
step 1, uniformly installing a charging array consisting of a plurality of charging coils below a parking space and in the middle of the parking space; the charging coil obtains the modulated electric energy from the power transmission bus through the voltage/current converter; the receiving coil is arranged on a chassis of the pure electric vehicle, and the size of the receiving coil is determined by the area of the chassis of the electric vehicle;
step 2, applying independent alternating current to each charging coil, and measuring the initial voltage V in the current coil by the voltage and current detection device in the coilT1…VTnCurrent information I1…In；
Step 3, calculating mutual inductance M between the charging coilsik(i ≠ k), total Cn 2The method comprises the following steps:
Mikdisconnecting the voltage source in the kth coil to form an open circuit for the mutual inductance of the ith and kth charging coils;
when a voltage V is applied to the coil iTiThen, resonant coupling is formed between the two coils, although the coil k is open-circuited, the current on the coil k is Ik0, but the pressure drop at the break can still be measured and is denoted as VTkThus, there are:
Figure FDA0003120773240000011
step 4, the total impedance of the receiving coil is a preset value, but the value of the impedance is changed due to the internal resistance change of the rechargeable battery pack; therefore, an impedance matching device is added between the receiving coil and the battery pack;
step 5, listing the following kirchhoff matrix equation based on the charging model in the steps 1 and 2:
Figure FDA0003120773240000012
in the matrix equation, ZiRepresents the total impedance of the ith charging coil, ZRRepresents the total impedance of the receive coil; because the whole wireless charging system always works in a resonance state, the capacitance and the inductance in the coil are balanced out, and the circuit becomes resistive, ZR＝jωLR+1/jωCR+RL＝RL；
Step 6, substituting the parameters obtained in the steps 2, 3 and 4 into the kirchhoff matrix equation to obtain the mutual inductance value M of the charging coil and the receiving coil1…M1n；
Step 7, processing the mutual inductance value M by applying the beam forming wireless charging algorithm1…M1n，Mi(1≤i≤n)；
Step 7.1, setting parameter miSimultaneously order
Figure FDA0003120773240000021
Step 7.2, setting parameter betaiLet us order
Figure FDA0003120773240000022
Wherein
Figure FDA0003120773240000023
And miAre complex conjugates of each other, denominator
Figure FDA0003120773240000024
Is represented by m1To mnThe sum of the squares of the absolute values of; beta is aiDimensionless, for adjusting the coefficient of current in the charging coil;
step 7.3, using betaiMultiplying by the initial current value I in the corresponding charging coiliTo obtain betaiIi，βiIiThat is, the charging coil i should be charged with the current for realizing the maximum efficiency;
step 7.4, new current betaiIiRe-substituting the ith of kirchhoff matrix equationLine, i.e. the voltage value V to be input to the ith charging coil for realizing the maximum charging efficiencyTi；
Repeating the operation of the step 7.1 to the step 7.4 to obtain the optimal voltage value V of all the charging coilsT1…VTnAnd loading the optimal voltage value on a corresponding charging coil, wherein the whole wireless charging is in the maximum efficiency state.
2. The wireless charging method for the pure electric vehicle in the static state based on the beam forming principle according to claim 1, further comprising a step 8 of controlling a charging coil:
step 8.1, when no vehicle exists in the parking space, the charging coil is not coupled with the receiving coil, and the current in the charging coil is large; at the moment, after the current detection device detects a larger current, the transmission system is closed, and charging is stopped;
step 8.2, when the electric vehicle needs to be charged, the receiving coil is coupled with the transmitting coil, and the current in the charging coil is reduced; at the moment, the current detection device detects that the current is low, and starts to transmit the system and start to charge;
8.3, when the electric vehicle is full, the circuit protection device in the receiving coil is disconnected, so that the receiving coil is open-circuited; the current in the charging coil is increased, and at the moment, after the current detection device detects a larger current, the transmission system is closed, and the charging is stopped;
8.4, when the electric vehicle drives away from the parking space, the receiving coil leaves, and the current in the charging coil is increased; at this time, after the current detection device detects a large current, the transmission system is closed, and charging is stopped.
3. The pure electric vehicle wireless charging method in the static state based on the beam forming principle according to claim 1, characterized in that: in the step 4, the impedance matching device is composed of a Buck-Boost circuit, and the working state of the circuit is changed by changing the duty ratio D of the MOS tube, so that the input impedance of the Buck-Boost circuit is changed, and the total impedance Z is further changedR；
The control equation is:
Figure FDA0003120773240000031
4. the pure electric vehicle wireless charging method in the static state based on the beam forming principle according to claim 1, characterized in that: the size of the charging coil is determined by the size of an actual parking space, and the diameter of the charging coil is not less than 1 meter.
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