CN103078381B - Wireless charging device for electric vehicle and output control method thereof - Google Patents

Wireless charging device for electric vehicle and output control method thereof Download PDF

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CN103078381B
CN103078381B CN201310031207.0A CN201310031207A CN103078381B CN 103078381 B CN103078381 B CN 103078381B CN 201310031207 A CN201310031207 A CN 201310031207A CN 103078381 B CN103078381 B CN 103078381B
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coil
transmitting
receiving
control
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CN103078381A (en
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廖承林
王丽芳
陶成轩
李均锋
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Institute of Electrical Engineering of CAS
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Institute of Electrical Engineering of CAS
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Abstract

The invention provides a wireless charging device for an electric vehicle and an output control method thereof. The wireless charging device comprises a transmitting end and a receiving end, wherein the transmitting end is connected with a work frequency power supply and consists of a work frequency rectifying unit, a power factor correction unit, an inversion unit, a transmitting coil unit, a first communication unit and a first control unit; and the receiving end is connected with a battery system of the electric vehicle and consists of a receiving coil unit, a load compensation unit, a high frequency rectifying and filtering unit, a BOOST transformation unit, a second communication unit and a second control unit. The output control method comprises the following steps of: carrying out power-on and power-off control on the output power by the transmitting end, and carrying out continuous closed-loop control on output voltage or current by the receiving end according to the requirements of a battery system. The transmitting coil unit and the receiving coil unit are mutually coupled to carry out wireless energy transmission, and the first communication unit and the second communication unit are communicated in a wireless way.

Description

A kind of wireless electric vehicle charging device and output control method thereof
Technical field
The present invention relates to a kind of electric automobile wireless charging device, particularly relate to a kind of wireless electric vehicle charging device and output control method thereof of high-power, high efficiency, middle distance.
Background technology
Development of EV wireless charging technical meaning is great, and it is easy to wear thoroughly to solve conventional contact charging, easily gets an electric shock, the shortcoming that repeatedly delivery of electrical energy may be caused unreliable and inconvenient etc. after plug.But electric automobile wireless charging at least needs the power output of several kW, transmission range requires also comparatively far away, and this causes very large challenge to electric automobile wireless charging technology.
Existing wireless charging product generally adopts the features such as way of electromagnetic induction carries out electric power transfer, and it is little that this series products has power, and efficiency is not high, and transmission range is near, is mainly used in portable type electronic product charging.These features result in and utilize the wireless charging device of electromagnetic induction principle to be difficult to be applied to charging electric vehicle.
In November, 2006, Massachusetts Institute Technology (MIT) department of physics assistant professor Marin Soljacic research group proposed magnetic coupling harmonic technology, and carried out experimental verification in June, 2007, a 60W bulb is lighted every sky by 2.16m of being separated by, efficiency is 40%(document 1::Andre Kurs et al, " Wireless power transfer via strongly coupled magnetic resonances ", on July 6th, 2007, Science, VOL317, p.83-86).But the power delivery of 60W still can not meet the power demand of charging electric vehicle KW level far away, and the operating frequency of about the 10MHz mentioned in article brings difficulty also to the design of the high power switching power supply power in Contactless power transmission device.Chinese patent CN102177042A " noncontact electric power distribution device and have the vehicle of noncontact electric power distribution device ", on the basis of the principle of above-mentioned document 1, adds the auxiliary devices such as main circuit, and has carried out compact designed.
The demand of current electric automobile wireless charging generally needs through-put power to be not less than traditional passenger car standard, wireless transmission distance is greater than passenger car chassis clearance and can reaches 20cm to 40cm, radio transmission efficiency can reach more than 90%, meets above demand and there is extreme difficulties.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art part, a kind of power output is proposed large, efficiency is high, transmission range medium and also be easy to realize wireless electric vehicle charging device, little to solve the transmission range that existing wireless charging device exists mostly, the shortcomings such as through-put power is little, and efficiency is low, difficult design.
For solving the problems of the technologies described above, the present invention proposes a kind of wireless electric vehicle charging device and output control method thereof, mainly comprise reduction system operating frequency, change the individual pen induction coil in non-patent literature 1 into multi-turn series resonant structure, the series resonance building-out capacitor of first coil is utilized to carry out impedance matching, improve load compensation circuit to raise the efficiency, and at receiving terminal, adaptive control is carried out to meet real requirement to output voltage and electric current.This wireless electric vehicle charging device comprises the transmitting terminal be connected with power frequency supply and the receiving terminal be connected with electric vehicle battery system.
Described transmitting terminal is made up of industrial frequency rectifying unit, power factor correction unit, inversion unit, transmitting coil unit, the first communication unit and the first control unit.Described industrial frequency rectifying unit, power factor correction unit, inversion unit are connected according to this sequential series with transmitting coil unit, and the first communication unit and the first control unit are connected in series, and the first control unit controls the output of inversion unit.
Described receiving terminal is made up of receiving coil unit, load compensation unit, filtering high-frequency rectifier unit, BOOST boosting inverter unit, second communication unit and the second control unit.Receiving coil unit, filtering high-frequency rectifier unit, BOOST boosting inverter unit connects according to this sequential series, the output connecting electric automobile battery system of BOOST boosting inverter unit, second communication unit and the second control unit are connected in series, the feedback signal of electric vehicle battery system as the input of the second control unit, the output control BOOST boosting inverter unit of the second control unit.The feedback signal of described battery system comprises the remaining capacity SOC of battery, electric current, voltage, the information such as temperature.
In described transmitting terminal:
Described industrial frequency rectifying unit is diode full-bridge rectification.
Described power factor correction unit is power factor correction unit, can adopt Active Power Factor Correction topology, also can adopt PPFC (Passive Power Factor Correction) topology.
The effect of described inverter circuit unit the direct voltage obtained through industrial frequency rectifying unit and power factor correction unit is reverse into high-frequency ac voltage, for transmitting coil unit.The topology of inversion unit adopts full bridge inverter, adopts fixed duty cycle to control.In the present invention, the inversion unit output voltage typical operating frequency after inversion is between 20KHZ to 500KHZ, and the output of inverter circuit is controlled by affiliated first control unit.
Described transmitting coil unit is embedded in underground or installs on the ground, and described receiving coil unit is fixed on the bottom of electric automobile.
Described transmitting coil unit amplifies coil by transmitting coil and transmitting terminal and forms, transmitting coil and transmitting terminal amplify coil can adopt circle or polygonized structure, transmitting coil is identical with the radius size that transmitting terminal amplifies coil, parallel placement, what transmitting coil and transmitting terminal amplified coil is centrally located on same axis, the radius of transmitting coil unit is the beeline between transmitting coil unit center axis and limit, is radius of a circle when transmitting coil unit is circular configuration.From locus, transmitting terminal amplifies coil and is positioned on transmitting coil, and the space between two coils is less than 10mm.
Described receiving coil unit amplifies coil by receiving terminal and receiving coil is formed, and receiving terminal amplifies coil and receiving coil can be circular configuration or polygonized structure, and two coil sizes are identical, parallel placement.What receiving terminal amplified coil and receiving coil is centrally located on same axis, and the radius of receiving coil unit is the beeline between receiving coil unit center axis and limit, is radius of a circle when receiving coil unit is circular configuration.From locus, receiving coil is positioned at receiving terminal and amplifies on coil, makes described transmitting terminal amplify coil adjacent with receiving terminal amplification coil.
Described transmitting coil and receiving coil are in series with variable resonance compensation electric capacity, transmitting terminal amplifies coil and receiving terminal amplification coils from parallel connection of coils has variable resonance compensation electric capacity, when making transmitting terminal coil and receiving terminal coil working in natural resonance point or close to natural resonance point, transmitting coil unit and receiving coil unit transmission range are 100mm-500mm.When transmitting coil unit is to receiving coil unit transmitting energy, the central axis of transmitting coil unit and the central axis of receiving coil do not need close alignment, when the distance of two central axis is no more than the radius of transmitting coil unit, transmitting coil unit all can meet the charge requirement of electric automobile to the maximum transmission power of receiving coil unit transmitting energy and efficiency, but two central axis distances are nearer, the maximum transmission power of described wireless electric vehicle charging device is larger, and efficiency is higher.
Described transmitting coil resonance compensation electric capacity can also regulate the impedance of inversion unit simultaneously, impedance matching is carried out to the equivalent electric circuit after inverter circuit, namely special impedance transformation unit is not needed, by means of only regulating the capacitance of transmitting coil resonance compensation electric capacity and adjustment capable of realizing impedance matching.
Described load compensation unit is LC cascaded structure, can make the continuous input current of filtering high-frequency rectifier, reduces receiving terminal convertor assembly to the impact of wireless energy transfer link, ensure transmitter unit and receiving element Energy Transfer continuous.In order to make the voltage on LC as far as possible little, ensure that the voltage outputted in load is enough large, described LC is in resonance condition under receiving coil exports fundamental voltage frequency.
Described filtering high-frequency rectifier unit is diode full bridge rectifier, and the high frequency voltage rectification that receiving coil unit exports by it is direct voltage.After adding load compensation unit, filtering high-frequency rectifier unit is within an input voltage cycle, and the time that each diode has forward current to flow through is 50% of voltage cycle.
Described BOOST boosting inverter unit for the appropriate voltage value of battery system charging, and can control output current and power output thus to be converted to by output voltage of the present invention.BOOST converter unit and the second control unit and battery system form closed-loop control system, closed-loop adjustment duty ratio can be carried out according to state information, charging modes and battery charging curves such as battery dump energy SOC, realize BOOST boosting inverter unit and export constant voltage or current constant control.
Described first communication unit and second communication unit are wireless communication module, mutually carry out radio communication with full duplex or semiduplex mode.Content of Communication at least comprises described wireless electric vehicle charging device receiving terminal charging application, charged state, transmitting terminal charging allows, charge information, voltage, the electric current of input, the information such as voltage, electric current exported, coordinate described first control unit and the second control unit work with this, make the output voltage electric current of wireless charging device meet the charge requirement of battery system.
The first described control unit and the second control unit are the control circuit of transmitting terminal inversion unit and receiving terminal BOOST boosting inverter unit, control inversion unit and BOOST boosting inverter unit respectively, it controls according to the obtained information that to communicate with second communication unit wireless for the first described communication unit, and coordinate the first control unit and the second control unit synchronous working according to these information, make the output voltage electric current of wireless charging device meet the charge requirement of battery system.
Described BOOST boosting inverter unit is by inductance, first full-control type power device, first diode, electric capacity, second diode and the second full-control type power device are formed, wherein inductance, first diode, second diode, battery system and the second full-control type power device successively order are connected in series, the high-pressure side of the first full-control type power device is connected between inductance and the first diode, the high-pressure side of electric capacity is connected between the first diode and the second diode, the low-pressure end of the first full-control type power device and electric capacity is connected to the low-pressure end of the second full-control type power device jointly.
Described output control method is open or closing control in the output of transmitting terminal to charging device, transmitting terminal inversion unit adopts fixed duty cycle to control, namely open the power stage of transmitting terminal according to the charge request of receiving terminal, stop according to the charging of receiving terminal or detect the power stage of automatically closing transmitting terminal after transmitting terminal industrial frequency rectifying cell current is less than set point, when the second control unit prepare to accept electric energy that transmitting terminal passes over charge to battery system time, open the second full-control type power device, between charge period, receiving terminal is according to battery system dump energy, the state informations such as temperature and charging requirement carry out output constant current or Isobarically Control to charging device, i.e. receiving terminal monitoring battery system remaining capacity SOC value and other state informations, the magnitude of voltage that monitoring high-frequency rectification unit exports and current value, the magnitude of voltage that monitoring BOOST boosting inverter unit exports and current value, the PWM duty ratio of BOOST boosting inverter unit is regulated to realize output constant current or the Isobarically Control of wireless charging device according to the charging curve of setting by closed-loop control, to meet the charge requirement of electric vehicle battery system, when terminating when charging or need to stop charging, second control unit closes the second full-control type power device, and make the duty ratio of the first full-control type power device be 0, can stop charging to battery system.
Compared with existing wireless charging technology, the present invention has the following advantages:
1, through-put power of the present invention is large, and efficiency of transmission is high.
2, compared with the existing wireless charging device based on magnetic induction coupling principle, the present invention increases the distance of wireless transmission greatly, reaches 100mm-500mm, and the power efficiency of transmission is also higher than the existing wireless charging device based on magnetic induction coupling principle a lot.
3, compared with the existing wireless charging device based on magnetic coupling resonance principle, the frequency of the even tens of MHz of several MHz that magnetic coupling harmonic technology is commonly used by the present invention has been reduced to 20KHZ-500KHZ, at this frequency band, Switching Power Supply is convenient to design, efficiency is high, greatly reduces design difficulty of the present invention.
4, transmitting terminal has the adaptive ability to power output, only needs to open or closing control power output; By the effectively control flexibly regulating receiving terminal BOOST boosting inverter unit duty ratio just can realize the output voltage of wireless charging device, electric current and power, different charge requirement can be met.
Accompanying drawing explanation
Fig. 1 is illustrated structural representation;
Fig. 2 is use schematic diagram of the present invention;
Fig. 3 is the structure chart of transmitting coil unit of the present invention and receiving coil unit;
Fig. 4 a is load compensation element circuit schematic diagram of the present invention;
The voltage current waveform that when Fig. 4 b is not loading compensating unit, receiving coil exports;
Fig. 4 c is the voltage current waveform that after adding load compensation unit, receiving coil exports;
Fig. 5 is BOOST boosting inverter unit and closed loop control logic block diagram thereof.
Embodiment
The present invention is further described below in conjunction with the drawings and specific embodiments.
Wireless electric vehicle charging device of the present invention comprises the transmitting terminal be connected with power frequency supply and the receiving terminal be connected with electric vehicle battery system.
Described transmitting terminal is made up of industrial frequency rectifying unit, power factor correction unit, inversion unit, transmitting coil unit, the first communication unit and the first control unit.Described industrial frequency rectifying unit, power factor correction unit, inversion unit are connected according to this sequential series with transmitting coil unit, and the first communication unit and the first control unit are connected in series, and the first control unit controls the output of inversion unit.
Described receiving terminal is made up of receiving coil unit, load compensation unit, filtering high-frequency rectifier unit, BOOST boosting inverter unit, second communication unit and the second control unit.Receiving coil unit, load compensation unit, filtering high-frequency rectifier unit, BOOST boosting inverter unit like this sequential series connect, and the electric energy that BOOST boosting inverter unit exports is for electric vehicle battery system.Second communication unit and the second control unit are connected in series, and the feedback signal of electric vehicle battery system inputs as the second control unit, the output control BOOST boosting inverter unit of the second control unit.The feedback signal of described battery system comprises the remaining capacity SOC of battery, electric current, voltage, the information such as temperature.
As shown in Figure 1, the transmitting terminal of this device is made up of industrial frequency rectifying unit, power factor correction unit, inversion unit, transmitting coil unit, the first communication unit and the first control unit.Described industrial frequency rectifying unit, power factor correction unit, inversion unit are connected according to this sequential series with transmitting coil unit, and the first communication unit and the first control unit are connected in series, and the first control unit controls the output of inversion unit.The receiving terminal of this device is made up of receiving coil unit, load compensation unit, filtering high-frequency rectifier unit, BOOST boosting inverter unit, second communication unit and the second control unit.Described receiving coil unit, load compensation unit, filtering high-frequency rectifier unit, BOOST boosting inverter unit like this sequential series connect, and the electric energy that BOOST boosting inverter unit exports is for battery system.Second communication unit and the second control unit are connected in series, and the feedback signal of electric vehicle battery system inputs as the second control unit, the output control BOOST boosting inverter unit of the second control unit.Described transmitting coil unit and receiving coil unit carry out wireless power transmission, and the first described communication unit and second communication unit carry out radio communication, do not have the connection of electric wire between transmitting terminal and receiving terminal.
As shown in Figure 2, when the vehicle being provided with receiving coil is parked on the ground being provided with described transmitting terminal, the distance of described transmitting coil unit center axis and receiving coil unit center axis is made to be no more than the radius r of transmitting coil unit, the present invention can start charging, transmitting coil central axis and receiving coil central axis are apart from nearer, the peak power output that the present invention can provide is larger, efficiency of transmission is higher, described transmitting coil unit and receiving coil cell distance can at a distance of 100mm-500mm, and this distance segment can be applicable to the charging of most vehicle.
Be illustrated in figure 3 the transmitting coil unit of apparatus of the present invention transmitting terminal and the receiving coil unit of receiving terminal.Spatially go up the transmitting coil 11 being followed successively by transmitting coil unit from bottom to top, transmitting terminal amplifies coil 12, and the receiving terminal of wiring coil unit amplifies coil 21 and receiving coil 22, is coupled between coil with air gap.As a kind of embodiment, by transmitting coil 11, transmitting terminal amplifies coil 12,4 coils such as receiving terminal amplification coil 21, receiving coil 22 etc. are all coiled into the helical form circular coil that diameter 2r is 500mm, and namely radius r is 250mm.Coil is coiled into by multiply enamelled wire, and transmitting coil 11 and the receiving coil 22 coiling number of turn are 2 circles, and it is 5 circles that transmitting terminal amplification coil 12 amplifies the coil 21 coiling number of turn with receiving terminal.The distance that transmitting coil 11 and transmitting terminal amplify between coil 12 is less than 10mm, and equally, the distance that receiving coil 22 and receiving terminal amplify between coil 21 is less than 10mm.Transmitting terminal amplifies coil 12 and the receiving terminal distance of amplifying between coil 21 is 250mm.It is identical that radius r and transmitting coil and the transmitting terminal of transmitting coil unit amplify coil radius, and it is identical with receiving coil radius that radius r and the receiving terminal of receiving coil unit amplify coil.The parallel placement of coil described in 4, being centrally located on same axis of the coil described in 4.Certainly, this structure is only the size of a kind of example, coil, and shape, the number of turn, distance, material can adjust according to actual conditions difference.
Transmitting coil is in series with the first variable resonant building-out capacitor C1, receiving coil is in series with the 4th variable resonant building-out capacitor C4, transmitting terminal amplifies coils from parallel connection of coils the second variable resonant building-out capacitor C2, and receiving terminal amplifies coils from parallel connection of coils the 3rd variable resonant building-out capacitor C3.
The electric energy conversion that described inversion unit exports is magnetic field energy by described transmitting coil, and transfer its energy to transmitting terminal amplification coil by magnetic Field Coupling principle, transmitting terminal amplifies coil and utilizes its low-impedance characteristic, magnetic field is amplified and is passed to receiving terminal and amplify coil, receiving terminal amplifies coil and utilizes its low-impedance characteristic, amplified further in the magnetic field received, and pass to receiving coil by magnetic Field Coupling, magnetic field energy is converted into electric energy and exports load to by receiving coil.Transmitting coil and transmitting terminal amplify coil and utilize respective resonance compensation electric capacity, effectively improve mutual degree of coupling, and are that magnetic field energy is launched by electric energy conversion.Receiving terminal amplifies coil and receiving coil utilizes respective resonance compensation electric capacity, and the magnetic field energy effectively received also is converted into electric energy.Transmitting coil, transmitting terminal amplify coil, receiving terminal amplifies coil, receiving coil all serves magnetic field amplification, respective multiplication factor can pass through each parallel resonance electric capacity C1, C2, C3, C4 adjusts, natural resonance frequency and the supply frequency of parallel resonance electric capacity and coil inductance are more close, and the multiplication factor of coil to magnetic field is higher.
Coil multiplication factor improves the increase electric current of coil and the voltage of shunt capacitance, threat is brought to insulation safety of the present invention, proposing for this reason under the prerequisite meeting power delivery requirements, by reducing the multiplication factor of each coil, reducing electric current and the voltage of each coil.Can according to the distance d of transmitting coil and receiving coil, the withstand voltage of resonance compensation electric capacity regulates four resonance compensation electric capacity, makes maximum transmission power of the present invention, efficiency value, and resonance compensation electric capacity C1, the magnitude of voltage on C2, C3, C4 reaches designing requirement.
As shown in fig. 4 a, the AC energy of high frequency could need use after filtering high-frequency rectifier unit becomes direct voltage, but through the phenomenon that filtering high-frequency rectifier unit can cause receiving coil cell current interrupted, as shown in Figure 4 b, only when outlet side voltage is higher than voltage on filter capacitor, just electric current can be flow through in rectifier bridge, which results in output winding, to flow through time of electric current very short, and the amplitude flowing through electric current is very large, but the magnetic field supporting Energy Transfer only just can be had to exist when there being electric current in transmitting coil unit and receiving coil unit, the electric current that receiving coil exports must be continuously.In order to reach this object, this device is introduced by the LC structure of inductance and capacitances in series as load compensation unit, as illustrated in fig. 4 c, the time that in filtering high-frequency rectifier unit, each diode has forward current to flow through is made to be 50% of the High frequency filter unit input voltage cycle by regulating the parameter of inductance L and electric capacity C, input current is nothing cutout phenomenon in whole voltage cycle, transmitting coil unit energy can be transferred to receiving coil continuously, the introducing of the load compensation unit formed to make inductance L and electric capacity C does not affect output voltage, resonance condition is under the fundamental voltage frequency regulating the value of inductance L and electric capacity C that load compensation unit is exported at output winding, the voltage that such load compensation unit bears is very little, load can obtain larger magnitude of voltage.
In the present invention, as shown in Figure 5, the adjustment of wireless charging device output voltage electric current only need be realized by the second control unit, and the second control unit and BOOST boosting inverter unit, battery system form closed-loop structure, by regulating the output of PWM Duty ratio control BOOST boosting inverter unit.BOOST boosting inverter unit is made up of inductance L, the first full-control type power device V1, the second full-control type power device V2, electric capacity C, the first diode VD1 and the second diode VD2 as shown in Figure 5.When the second control unit prepare to accept electric energy that transmitting terminal passes over charge to battery system time, open the second full-control type power device V2, between charge period, the second control unit detects the remaining capacity SOC of battery system, voltage, electric current, the state informations such as temperature, the voltage U that high-frequency rectification unit exports and electric current I, and after the voltage U o of BOOST boosting inverter unit output and Io, according to charging modes or the charging curve of setting, by controlling PWM duty ratio, the voltage U o that BOOST boosting inverter unit exports is carried out to Isobarically Control or carries out current constant control to electric current I o, output of the present invention is made to meet the charge requirement of battery system, when terminating when charging or need to stop charging, second control unit closes the second full-control type power device V2, and the duty ratio making the first full-control type power device V1 is 0, can stop charging to battery system.

Claims (6)

1. a wireless electric vehicle charging device, is characterized in that described wireless charging device comprises the transmitting terminal being connected to power frequency supply and the receiving terminal be connected with electric vehicle battery system; Described transmitting terminal is made up of industrial frequency rectifying unit, power factor correction unit, inversion unit, transmitting coil unit, the first communication unit and the first control unit; Described industrial frequency rectifying unit, power factor correction unit, inversion unit are connected with transmitting coil unit successively sequential series; The first described communication unit and the first control unit are connected in series, and the output of the first control unit controls inversion unit; Described receiving terminal is made up of receiving coil unit, load compensation unit, filtering high-frequency rectifier unit, BOOST boosting inverter unit, second communication unit and the second control unit; Receiving coil unit, filtering high-frequency rectifier unit, BOOST boosting inverter unit successively sequential series connects; The output connecting electric automobile battery system of BOOST boosting inverter unit; Second communication unit and the second control unit are connected in series; The feedback signal of battery system as the input of the second control unit, the output control BOOST boosting inverter unit of the second control unit; First communication unit of described transmitting terminal is communicated by wireless signal with the second communication unit of receiving terminal;
The transmitting coil unit of described transmitting terminal amplifies coil by transmitting coil and transmitting terminal and forms; The radius of transmitting coil is identical with the radius that transmitting terminal amplifies coil; Transmitting coil amplifies the parallel placement of coil with transmitting terminal; What transmitting coil and transmitting terminal amplified coil is centrally located on same axis; The spacing that transmitting coil and transmitting terminal amplify coil is less than 10mm; Described transmitting coil unit is embedded in underground or places on the ground;
The receiving coil unit of described receiving terminal amplifies coil by receiving coil and receiving terminal and forms; The radius of receiving coil is identical with the radius that receiving terminal amplifies coil; Receiving coil amplifies the parallel placement of coil with receiving terminal; What receiving coil and receiving terminal amplified coil is centrally located on same axis, and the spacing that receiving coil and receiving terminal amplify coil is less than 10mm, and described receiving coil unit is fixed on the bottom of electric automobile;
Transmitting coil in described transmitting coil unit is in series with the first variable resonant building-out capacitor (C1); The receiving coil of receiving coil unit is in series with the 4th variable resonant building-out capacitor (C4); Transmitting terminal amplifies coils from parallel connection of coils the second variable resonant building-out capacitor (C2); Receiving terminal amplifies coils from parallel connection of coils the 3rd variable resonance compensation electric capacity (C3); The multiplication factor of the coil described in four to magnetic field can be changed by regulating the value of described resonance compensation electric capacity;
Described inversion unit is full bridge inverter, and the operating frequency of inversion unit output voltage is between 20KHZ to 500KHZ.
2. wireless electric vehicle charging device according to claim 1, it is characterized in that, the distance of the transmitting coil unit center axis of described transmitting terminal and the receiving coil unit center axis of receiving terminal is no more than the radius (r) of transmitting coil unit; Transmitting coil unit and receiving coil unit vertical range are between 100mm to 500mm; Wireless power transmission is carried out between described transmitting coil unit and receiving coil unit.
3. wireless electric vehicle charging device according to claim 1, is characterized in that the load compensation unit of described receiving terminal is for be made up of inductance and capacitances in series; Described inductance and electric capacity are in resonance condition under inverter output voltage frequency, the inductance capacitance parameter value of described load compensation unit meets in the one-period of the receiving coil unit output voltage of described receiving terminal, and the time that in described filtering high-frequency rectifier unit, each diode has forward current to flow through accounts for 50% of the whole cycle.
4. wireless electric vehicle charging device according to claim 1, it is characterized in that described first communication unit and second communication unit at least comprise described wireless electric vehicle charging device receiving terminal charge request by the content of communicating wireless signals, charge stop, SOC, charged state, transmitting terminal charging allows, charge information, the voltage and current of input, and the voltage and current exported, coordinate described first control unit and the second control unit work with this, make the output voltage electric current of wireless charging device meet the charge requirement of battery system.
5. wireless electric vehicle charging device according to claim 1, is characterized in that described BOOST boosting inverter unit is made up of inductance (L), the first full-control type power device (V1), the first diode (VD1), electric capacity (C), the second diode (VD2) and the second full-control type power device (V2), wherein inductance (L), first diode (VD1), second diode (VD2), battery system and the second full-control type power device (V2) successively order are connected in series, the high-pressure side of the first full-control type power device (V1) is connected between inductance (L) and the first diode (VD1), the high-pressure side of electric capacity (C) is connected between the first diode (VD1) and the second diode (VD2), the low-pressure end of the first full-control type power device (V1) and electric capacity (C) is connected to the low-pressure end of the second full-control type power device (V2) jointly.
6. the output control method of wireless electric vehicle charging device according to claim 1, when it is characterized in that described wireless charging device work, described transmitting terminal adapts to the change of load automatically, inversion unit adopts fixing PWM Duty ratio control, described transmitting terminal opens the power stage of transmitting terminal according to the charge request of receiving terminal, stops or detecting the power stage of automatically closing transmitting terminal after transmitting terminal industrial frequency rectifying cell current is less than set point according to the charging of receiving terminal, when described second control unit prepare to accept electric energy that transmitting terminal passes over charge to battery system time, open the second full-control type power device (V2), the BOOST boosting inverter unit of receiving terminal described between charge period adopts and regulates PWM Duty ratio control first full-control type power device (V1), according to battery system dump energy, temperature and charging requirement carry out output constant current or Isobarically Control to charging device, i.e. receiving terminal monitoring battery system remaining capacity SOC value and other state informations, the magnitude of voltage that monitoring high-frequency rectification unit exports and current value, the magnitude of voltage that monitoring BOOST boosting inverter unit exports and current value, the PWM duty ratio of BOOST boosting inverter unit is regulated to realize output constant current or the Isobarically Control of wireless charging device according to the charging curve of setting by closed-loop control, to meet the charge requirement of electric vehicle battery system, when terminating when charging or need to stop charging, second control unit closes the second full-control type power device (V2), and the duty ratio making the first full-control type power device (V1) is 0, can stop charging to battery system.
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