CN103078381A - 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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Publication number
CN103078381A
CN103078381A CN2013100312070A CN201310031207A CN103078381A CN 103078381 A CN103078381 A CN 103078381A CN 2013100312070 A CN2013100312070 A CN 2013100312070A CN 201310031207 A CN201310031207 A CN 201310031207A CN 103078381 A CN103078381 A CN 103078381A
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unit
coil
transmitting
receiving
charging
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CN103078381B (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, relate in particular to wireless electric vehicle charging device and the output control method thereof of a kind 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 the charging of traditional contact, easily gets an electric shock, and repeatedly may cause the shortcomings such as delivery of electrical energy is unreliable and inconvenient after the plug.But the electric automobile wireless charging needs the power output of several kW at least, and transmission range requires also far away, and this has caused very large challenge for electric automobile wireless charging technology.
Existing wireless charging product generally adopts way of electromagnetic induction to carry out electric power transfer, and this series products has the characteristics such as power is little, and efficient is not high, and transmission range is near, is mainly used in the portable type electronic product charging.These characteristics have caused utilizing the wireless charging device of electromagnetic induction principle to be difficult to be applied to charging electric vehicle.
Assistant professor Marin Soljacic research group of department of physics of in November, 2006 Massachusetts Institute Technology (MIT) has proposed the magnetic coupling harmonic technology, and carried out experimental verification in June, 2007, the 2.16m of being separated by lights a 60W bulb every sky, efficient 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 satisfy the power demand of charging electric vehicle KW level far away, and the operating frequency about the 10MHz that mentions in the article has brought difficulty also for the design of the high power switching power supply power in the Contactless power transmission device.Chinese patent CN102177042A " noncontact electric power distribution device and have the vehicle of noncontact electric power distribution device " has increased the auxiliary devices such as main circuit, and has carried out compact designed on the basis of the principle of above-mentioned document 1.
The demand of electric automobile wireless charging generally needs through-put power to be not less than traditional passenger car standard at present, wireless transmission distance is greater than the passenger car chassis clearance and can reach 20cm to 40cm, radio transmission efficiency can reach more than 90%, satisfies above demand and has greatly difficulty.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art part, it is large to propose a kind of power output, efficient is high, medium and the wireless electric vehicle charging device that is easy to realize of transmission range, little to solve the transmission range that existing wireless charging device exists mostly, through-put power is little, and efficient is low, the shortcomings such as 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 and reduce the system works frequency, change the individual pen induction coil in the non-patent literature 1 into multi-turn series resonance structure, utilize the series resonance building-out capacitor of first coil to carry out impedance matching, improve the load compensation circuit raising the efficiency, and at receiving terminal output voltage and electric current are carried out adaptive control to satisfy real requirement.This wireless electric vehicle charging device comprises the transmitting terminal that links to each other with power frequency supply and the receiving terminal that links to each other with electric vehicle battery system.
Described transmitting terminal is made 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 and transmitting coil unit sequentially are connected in series according to this, and the first communication unit and the first control unit are connected in series, the output of the first control unit control inversion unit.
Described receiving terminal is made 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 sequentially is connected in series according to this, 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 is as the input of the second control unit, and BOOST boosting inverter unit is controlled in the output 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 the described transmitting terminal:
Described industrial frequency rectifying unit is the diode full-bridge rectification.
Described power factor correction unit is power factor correction unit, can adopt the Active Power Factor Correction topology, also can adopt the PPFC (Passive Power Factor Correction) topology.
The effect of described inverter circuit unit is that the direct voltage that will obtain through industrial frequency rectifying unit and power factor correction unit is reverse into high-frequency ac voltage, for the transmitting coil unit.The topology of inversion unit adopts full bridge inverter, adopts fixed duty cycle control.In the present invention, the inversion unit output voltage exemplary operation frequency after the inversion is between 20KHZ to 500KHZ, and the output of inverter circuit is controlled by affiliated the first control unit.
Described transmitting coil unit is embedded in underground or installs on the ground, and described receiving coil unit is fixed in the bottom of electric automobile.
Described transmitting coil unit amplifies coil by transmitting coil and transmitting terminal and consists of, 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, transmitting coil and transmitting terminal amplify being centered close on the same axis of coil, the radius of transmitting coil unit is the beeline between transmitting coil unit center axis and the limit, is radius of a circle when the transmitting coil unit is circular configuration.From the locus, transmitting terminal amplifies coil and is positioned on the transmitting coil, and the space between two coils is less than 10mm.
Described receiving coil unit amplifies coil by receiving terminal and receiving coil consists of, and receiving terminal amplifies coil and receiving coil can be circular configuration or polygonized structure, and two coil sizes are identical, parallel placement.Receiving terminal amplifies being centered close on the same axis of coil and receiving coil, and the radius of receiving coil unit is the beeline between receiving coil unit center axis and the limit, is radius of a circle when the receiving coil unit is circular configuration.From the locus, receiving coil is positioned at receiving terminal and amplifies on the coil, so that described transmitting terminal amplification coil is 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.The transmitting coil unit is during to receiving coil unit transmitting energy, the central axis of transmitting coil unit does not need strictly to align with the central axis of receiving coil, when the distance of two central axis is no more than the radius of transmitting coil unit, the charging demand that the transmitting coil unit all can satisfy electric automobile to maximum transmission power and the efficient of receiving coil unit transmitting energy, but two central axis distance is nearer, the maximum transmission power of described wireless electric vehicle charging device is larger, and efficient is higher.
Described transmitting coil resonance compensation electric capacity can also be regulated the impedance of inversion unit simultaneously, equivalent electric circuit after the inverter circuit is carried out impedance matching, namely do not need special impedance transformation unit, only can realize the impedance matching adjusting by the appearance value of regulating transmitting coil resonance compensation electric capacity.
Described load compensation unit is the LC cascaded structure, can make the continuous input current of filtering high-frequency rectifier, reduces the receiving terminal convertor assembly to the impact of wireless energy transfer link, guarantees that transmitter unit and receiving element Energy Transfer are continuous.In order to make the voltage on the LC as far as possible little, guarantee that the voltage that outputs in the load is enough large, described LC is in resonance condition under receiving coil output fundamental voltage frequency.
Described filtering high-frequency rectifier unit is the diode full bridge rectifier, and it is direct voltage with the high frequency voltage rectification of receiving coil unit output.After having added the load compensation unit, in the cycle, the time that each diode has forward current to flow through is 50% of voltage cycle at an input voltage in the filtering high-frequency rectifier unit.
Described BOOST boosting inverter unit is can supply the suitable voltage value of battery system charging for output voltage of the present invention is converted to, and thus output current and power output is controlled.BOOST converter unit and the second control unit and battery system form closed-loop control system, can come the closed-loop adjustment duty ratio according to state information, charging modes and battery charging curves such as battery dump energy SOC, realize BOOST boosting inverter unit output constant voltage or constant current control.
Described the 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 comprises described wireless electric vehicle charging device receiving terminal charging application, charged state at least, the transmitting terminal charging allows, charge information, voltage, the electric current of input, the information such as the voltage of output, electric current, coordinate described the first control unit and the second control unit work with this, make the output voltage electric current of wireless charging device satisfy the charging demand of battery system.
Described the first control unit and the second control unit are the control circuit of transmitting terminal inversion unit and receiving terminal BOOST boosting inverter unit, control respectively inversion unit and BOOST boosting inverter unit, its control is according to the resulting information of communicating by letter with the second communication unit wireless for described the first 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 satisfy the charging demand of battery system.
Described BOOST boosting inverter unit is by inductance, the first full-control type power device, the first diode, electric capacity, the second diode and the second full-control type power device consist of, inductance wherein, the first diode, the 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, and the low-pressure end of the first full-control type power device and electric capacity is connected in the low-pressure end of the second full-control type power device jointly.
Described output control method is for to open or closing control the output of charging device at transmitting terminal, the transmitting terminal inversion unit adopts fixed duty cycle control, namely open the power stage of transmitting terminal according to the charging request of receiving terminal, according to the charging of receiving terminal stop or detecting transmitting terminal industrial frequency rectifying cell current less than set point after the power stage of autoshutdown transmitting terminal; When the second control unit is prepared to accept electric energy that transmitting terminal passes over and is charged to battery system, open the second full-control type power device, receiving terminal is according to the battery system dump energy between charge period, the state information such as temperature and charging requirement are carried out output constant current or constant voltage control to charging device, be receiving terminal monitoring battery system remaining capacity SOC value and other state informations, magnitude of voltage and the current value of the unit output of monitoring high-frequency rectification, magnitude of voltage and the current value of the unit output of monitoring BOOST boosting inverter, recently realize output constant current or the constant voltage control of wireless charging device by the PWM duty of closed-loop control adjusting BOOST boosting inverter unit according to the charging curve of setting, to satisfy the charging demand of electric vehicle battery system, when charging finishes or need to stop to charge, the second control unit is closed the second full-control type power device, and the duty ratio that makes the first full-control type power device is 0, can stop battery system being charged.
Compare 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, compare based on the wireless charging device of magnetic induction coupling principle with existing, the present invention has increased the distance of wireless transmission greatly, reaches 100mm-500mm, and the power efficiency of transmission is also high a lot of than existing wireless charging device based on the magnetic induction coupling principle.
3, compare with existing wireless charging device based on the magnetic coupling resonance principle, several MHz that the present invention is commonly used with the magnetic coupling harmonic technology even the frequency of tens of MHz have been reduced to 20KHZ-500KHZ, at this frequency band, Switching Power Supply is convenient to design, efficient is high, greatly reduces design difficulty of the present invention.
4, transmitting terminal has the adaptive ability to power output, only needs power output is opened or closing control; Just can realize the flexibly effectively control of output voltage, electric current and the power of wireless charging device by regulating receiving terminal BOOST boosting inverter unit duty ratio, can satisfy different charging demands.
Description of drawings
Fig. 1 is structural representation shown in the present;
Fig. 2 is use schematic diagram of the present invention;
Fig. 3 is the structure chart of transmitting coil of the present invention unit and receiving coil unit;
Fig. 4 a is load compensation element circuit schematic diagram of the present invention;
The voltage current waveform of receiving coil output when Fig. 4 b is not loading compensating unit;
Fig. 4 c is the voltage current waveform that adds receiving coil output behind the load compensation unit;
Fig. 5 is BOOST boosting inverter unit and closed-loop control logic diagram thereof.
Embodiment
Further specify the present invention below in conjunction with the drawings and specific embodiments.
Wireless electric vehicle charging device of the present invention comprises the transmitting terminal that links to each other with power frequency supply and the receiving terminal that links to each other with electric vehicle battery system.
Described transmitting terminal is made 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 and transmitting coil unit sequentially are connected in series according to this, and the first communication unit and the first control unit are connected in series, the output of the first control unit control inversion unit.
Described receiving terminal is made 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 order are connected in series, and the electric energy of BOOST boosting inverter unit output is for the electric automobile battery system.Second communication unit and the second control unit are connected in series, and the feedback signal of electric vehicle battery system is inputted 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 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 and transmitting coil unit sequentially are connected in series according to this, and the first communication unit and the first control unit are connected in series, the output of the first control unit control inversion unit.The receiving terminal of this device is made 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 order are connected in series, and the electric energy of BOOST boosting inverter unit output 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 is inputted 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 described the first communication unit and second communication unit carry out radio communication, do not have being connected of electric wire between transmitting terminal and the receiving terminal.
As shown in Figure 2, be parked on the ground that described transmitting terminal is installed when the vehicle that receiving coil is installed, make the distance of described transmitting coil unit center axis and receiving coil unit center axis 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 distance are 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 be at a distance of 100mm-500mm, and this distance segment can be fit to most vehicle charging.
Be illustrated in figure 3 as the transmitting coil unit of apparatus of the present invention transmitting terminal and the receiving coil unit of receiving terminal.By the transmitting coil 11 that is followed successively by from bottom to top the transmitting coil unit on the space, transmitting terminal amplifies coil 12, and the receiving terminal of wiring coil unit amplifies coil 21 and receiving coil 22, is coupled with air gap between the coil.As a kind of embodiment, with transmitting coil 11, transmitting terminal amplify coil 12, receiving terminal amplify 4 coils such as coil 21, receiving coil 22 all coiled diameter 2r be the helical form circular coil of 500mm, namely radius r is 250mm.Coil is by multiply enamelled wire coiled, and transmitting coil 11 and the receiving coil 22 coiling numbers of turn are 2 circles, and it is 5 circles with the receiving terminal amplification coil 21 coiling numbers of turn that transmitting terminal amplifies coil 12.Distance between transmitting coil 11 and the transmitting terminal amplification coil 12 is less than 10mm, and is same, and the distance between receiving coil 22 and the receiving terminal amplification coil 21 is less than 10mm.The distance that transmitting terminal amplifies between coil 12 and the receiving terminal amplification coil 21 is 250mm.The radius r of transmitting coil unit is identical with transmitting terminal amplification coil radius with transmitting coil, and the radius r of receiving coil unit is identical with the receiving coil radius with receiving terminal amplification coil.4 parallel placements of described coil, being centered close on the same axis of 4 described coils.Certainly, this structure only is a kind of example, the size of coil, and shape, the number of turn, distance, material can be adjusted according to actual conditions are different.
Transmitting coil is in series with the first variable resonance compensation capacitor C 1, receiving coil is in series with the 4th variable resonance compensation capacitor C 4, transmitting terminal amplifies coils from parallel connection of coils the second variable resonance compensation capacitor C 2, and receiving terminal amplifies coils from parallel connection of coils the 3rd variable resonance compensation capacitor C 3.
Described transmitting coil is magnetic field energy with the electric energy conversion of described inversion unit output, and transfer its energy to transmitting terminal by the magnetic Field Coupling principle and amplify coil, transmitting terminal amplifies coil and utilizes its low-impedance characteristic, magnetic field amplified and be passed to receiving terminal amplify coil, receiving terminal amplifies coil and utilizes its low-impedance characteristic, the magnetic field that receives is further amplified, and pass to receiving coil by magnetic Field Coupling, receiving coil is converted into electric energy with magnetic field energy and exports load to.Transmitting coil and transmitting terminal amplify coil utilization resonance compensation electric capacity separately, the degree of coupling that Effective Raise is mutual, and be that magnetic field energy is launched with electric energy conversion.Receiving terminal amplifies coil and receiving coil utilization resonance compensation electric capacity separately, and the magnetic field energy that effectively receives also is converted into electric energy.Transmitting coil, transmitting terminal amplification coil, receiving terminal amplify coil, receiving coil has all played the magnetic field amplification, multiplication factor separately can be passed through each parallel resonance capacitor C 1, C2, C3, C4 adjusts, natural resonance frequency and the supply frequency of parallel resonance electric capacity and coil inductance are more approaching, and coil is higher to the multiplication factor in magnetic field.
The coil multiplication factor improves will increase the electric current of coil and the voltage of shunt capacitance, bring threat for insulation safety of the present invention, proposed under the prerequisite that satisfies the power delivery requirement, by reducing the multiplication factor of each coil, to reduce electric current and the voltage of each coil for this reason.Can according to transmitting coil and receiving coil apart from d, the withstand voltage of resonance compensation electric capacity is regulated four resonance compensation electric capacity, makes maximum transmission power of the present invention, efficiency value, resonance compensation capacitor C 1, C2, C3, the magnitude of voltage on the C4 reaches designing requirement.
Shown in Fig. 4 a, the AC energy of high frequency could be used after need becoming direct voltage through the filtering high-frequency rectifier unit, but can cause the interrupted phenomenon of receiving coil cell current through the filtering high-frequency rectifier unit, shown in Fig. 4 b, only when outlet side voltage is higher than voltage on the filter capacitor, ability current flowing in the rectifier bridge, this has just caused the time of output winding current flowing very short, and the amplitude of current flowing is very large, but only just can have the magnetic field of supporting Energy Transfer to exist in transmitting coil unit and the receiving coil unit when electric current is arranged, the electric current of receiving coil output must be continuously.In order to reach this purpose, this device is introduced LC structure by inductance and capacitances in series as the load compensation unit, shown in Fig. 4 c, make the time that each diode has forward current to flow through in the filtering high-frequency rectifier unit be 50% of the High frequency filter unit input voltage cycle by the parameter of regulating inductance L and capacitor C, input current is nothing cutout phenomenon in whole voltage cycle, the transmitting coil unit energy can be transferred to receiving coil continuously, for the introducing that makes the load compensation unit that inductance L and capacitor C consist of does not affect output voltage, the value of regulating inductance L and capacitor C makes the load compensation unit be in resonance condition under the fundamental voltage frequency of output winding output, the voltage that bears on the load compensation unit like this is very little, and load can obtain larger magnitude of voltage.
Among the present invention, as shown in Figure 5, the adjusting of wireless charging device output voltage electric current only need realize by the second control unit that 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 of inductance L, the first full-control type power device V1, the second full-control type power device V2, capacitor C, the first diode VD1 and the second diode VD2 as shown in Figure 5.When the second control unit is prepared to accept electric energy that transmitting terminal passes over and is charged to battery system, open the second full-control type power device V2, the second control unit detects the remaining capacity SOC of battery system between charge period, voltage, electric current, the state informations such as temperature, voltage U and the electric current I of the output of high-frequency rectification unit, and after the voltage U o and Io of the output of BOOST boosting inverter unit, according to charging modes or the charging curve set, by the PWM duty ratio is controlled, voltage U o to the output of BOOST boosting inverter unit carries out constant voltage control or electric current I o is carried out constant current control, make output of the present invention satisfy the charging demand of battery system, when charging finishes or need to stop to charge, the second control unit is closed the second full-control type power device V2, and the duty ratio that makes the first full-control type power device V1 is 0, can stop battery system being charged.

Claims (10)

1. a wireless electric vehicle charging device is characterized in that described wireless charging device comprises the transmitting terminal that is connected to power frequency supply and the receiving terminal that links to each other with electric vehicle battery system; Described transmitting terminal is made 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 and transmitting coil unit successively order are connected in series; Described the first communication unit and the first control unit are connected in series, the output control inversion unit of the first control unit; Described receiving terminal is made 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 order are connected in 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 battery system is as the input of the second control unit, and BOOST boosting inverter unit is controlled in the output of the second control unit; The first communication unit of described transmitting terminal and the second communication unit of receiving terminal communicate by wireless signal.
2. wireless electric vehicle charging device according to claim 1 is characterized in that, 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; Transmitting coil and transmitting terminal amplify being centered close on the same axis of coil; Distance is less than 10mm between transmitting coil and the transmitting terminal amplification coil; Described transmitting coil unit is embedded in underground or places on the ground.
3. wireless electric vehicle charging device according to claim 1 is characterized in that, 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; Receiving coil and receiving terminal amplify being centered close on the same axis of coil, and distance is less than 10mm between receiving coil and the receiving terminal amplification coil, and described receiving coil unit is fixed in the bottom of electric automobile.
4. wireless electric vehicle charging device according to claim 1 is characterized in that, the distance of the receiving coil unit center axis of the transmitting coil unit center axis of described transmitting terminal and 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; Carry out wireless power transmission between described transmitting coil unit and the receiving coil unit.
5. wireless electric vehicle charging device according to claim 1 is characterized in that, the transmitting coil in the described transmitting coil unit is in series with the first variable resonance compensation electric capacity (C1); The 4th variable resonance compensation electric capacity (C4) the transmitting terminal amplification coils from parallel connection of coils that is in series with of receiving coil unit has the second variable resonance compensation electric capacity (C2); Receiving terminal amplifies coils from parallel connection of coils the 3rd variable resonance compensation electric capacity (C3); Can change four described coils to the multiplication factor in magnetic field by the value of regulating described resonance compensation electric capacity.
6. wireless electric vehicle charging device according to claim 1 is characterized in that the load compensation unit of described receiving terminal is for to be comprised of inductance and capacitances in series; Described inductance and electric capacity are in resonance condition under the inverter output voltage frequency, the inductance capacitance parameter value of described load compensation unit satisfies in the one-period of the receiving coil unit of described receiving terminal output voltage, and the time that each diode has forward current to flow through in the described filtering high-frequency rectifier unit accounts for 50% of the whole cycle.
7. wireless electric vehicle charging device according to claim 1, it is characterized in that described the first communication unit and the second communication unit content by communicating wireless signals comprises at least that described wireless electric vehicle charging device receiving terminal charging request, charging stop, SOC, charged state, the transmitting terminal charging allows, charge information, the voltage and current of input, and the voltage and current of output, coordinate described the first control unit and the second control unit work with this, make the output voltage electric current of wireless charging device satisfy the charging demand of battery system.
8. wireless electric vehicle charging device according to claim 1 is characterized in that described inversion unit is full bridge inverter, and the exemplary operation frequency of inversion unit output voltage is between 20KHZ to 500KHZ.
9. wireless electric vehicle charging device according to claim 1 is characterized in that described BOOST boosting inverter unit is made 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 order is connected in series successively for inductance (L), the first diode (VD1), the second diode (VD2), battery system and the second full-control type power device (V2), 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), and the low-pressure end of the first full-control type power device (V1) and electric capacity (C) is connected in the low-pressure end of the second full-control type power device (V2) jointly.
10. 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 variation of load automatically, inversion unit adopts fixedly PWM Duty ratio control, described transmitting terminal is opened the power stage of transmitting terminal according to the charging request of receiving terminal, according to the charging of receiving terminal stop or detecting transmitting terminal industrial frequency rectifying cell current less than set point after the power stage of autoshutdown transmitting terminal; When described the second control unit is prepared to accept electric energy that transmitting terminal passes over and is charged to battery system, open the second full-control type power device (V2), the BOOST boosting inverter unit of described receiving terminal adopts and regulates PWM Duty ratio control the first full-control type power device (V1) between charge period, according to the battery system dump energy, the state information such as temperature and charging requirement are carried out output constant current or constant voltage control to charging device, be receiving terminal monitoring battery system remaining capacity SOC value and other state informations, magnitude of voltage and the current value of the unit output of monitoring high-frequency rectification, magnitude of voltage and the current value of the unit output of monitoring BOOST boosting inverter, recently realize output constant current or the constant voltage control of wireless charging device by the PWM duty of closed-loop control adjusting BOOST boosting inverter unit according to the charging curve of setting, to satisfy the charging demand of electric vehicle battery system, when charging finishes or need to stop to charge, the second control unit is closed the second full-control type power device (V2), and the duty ratio that makes the first full-control type power device (V1) is 0, can stop battery system being charged.
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