CN112026550A - Ground charging system, electric vehicle wireless charging system and method - Google Patents
Ground charging system, electric vehicle wireless charging system and method Download PDFInfo
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- CN112026550A CN112026550A CN202010922177.2A CN202010922177A CN112026550A CN 112026550 A CN112026550 A CN 112026550A CN 202010922177 A CN202010922177 A CN 202010922177A CN 112026550 A CN112026550 A CN 112026550A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/12—Inductive energy transfer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/30—Constructional details of charging stations
- B60L53/35—Means for automatic or assisted adjustment of the relative position of charging devices and vehicles
- B60L53/38—Means for automatic or assisted adjustment of the relative position of charging devices and vehicles specially adapted for charging by inductive energy transfer
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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
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
According to the ground charging system and the wireless charging system and method for the electric automobile, the position of the vehicle-mounted end coil is orthographically projected onto the ground end matrix type coil comprising a plurality of sub-coils arranged in a matrix form, all the sub-coils in the ground end matrix type coil, which are overlapped with the orthographically projected part of the vehicle-mounted end coil, are started, and the electric automobile is wirelessly charged. According to the invention, all the sub-coils in the ground end matrix type coil, which have the overlapped part with the orthographic projection of the vehicle-mounted end coil, are opened according to the alignment condition of the vehicle-mounted end coil and the ground end coil, so that the charging of the electric automobile is realized, the coil loss can be reduced, and the energy is saved.
Description
Technical Field
The invention relates to a wireless charging system, in particular to a ground charging system, an electric vehicle wireless charging system and an electric vehicle wireless charging method.
Background
The electric automobile has the advantages of small cleaning pollution, high energy conversion efficiency, simple structure, convenient maintenance and the like, and is called as a green and environment-friendly automobile in the 21 st century. When traditional electric automobile charges, there is the potential safety hazard in the frequent plug in-process of charging cable, and it is long to consume through the mode that fills electric pile and charge, and has a small in quantity, the inconvenient scheduling problem of maintenance. Therefore, wireless charging systems for electric vehicles are considered to be a great trend, and will likely become one of the main charging systems for electric vehicles in the future.
Although the wireless charging technology of the electric automobile has the advantages of convenience, safety, high reliability, strong environmental adaptability and the like, the transmission efficiency can be maximized only when the coil of the vehicle-mounted end is aligned with the coil of the ground end, and the expected charging effect is realized. Once the vehicle-mounted end is offset from the ground end, the transmission efficiency will drop rapidly. In consideration of the actual use condition of the user, it is difficult to ensure that each user can directly face the coil of the vehicle-mounted end of the electric vehicle to the coil of the ground end, which easily causes the reduction of the product experience of the user, and the defect seriously hinders the further development of the wireless charging system in the field of electric vehicles.
Disclosure of Invention
The invention aims to overcome the defects of the conventional wireless charging system of an electric automobile, realize high-efficiency wireless charging under the condition of large offset of the electric automobile, and provide a ground charging system, a wireless charging system of the electric automobile and a method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a wireless charging method for an electric vehicle comprises the following steps:
according to the detected position of the vehicle-mounted end coil, orthographically projecting the position of the vehicle-mounted end coil onto a ground end matrix coil comprising a plurality of sub-coils arranged in a matrix form, starting all sub-coils in the ground end matrix coil, which have overlapping parts with the orthographically projected position of the vehicle-mounted end coil, and wirelessly charging the electric automobile.
The invention has the further improvement that a plurality of positioning sensors are arranged in the ground end matrix coil, each positioning sensor can mark at least one sub-coil, and when the positioning sensors detect the position of the vehicle-mounted end coil, all the sub-coils which can be marked by the positioning sensors are started to wirelessly charge the electric vehicle.
A wireless charging system of an electric automobile comprises a ground end matrix type coil, a vehicle-mounted end coil, a positioning sensor, a processor and a control circuit;
the ground end matrix type coil comprises a plurality of sub-coils arranged in a matrix form;
the positioning sensor is used for detecting the position of the vehicle-mounted end coil;
the processor is used for judging the position information of the coil at the vehicle-mounted end and sending the position information to the control circuit;
and the control circuit is used for opening all sub-coils which are arranged in the ground end matrix type coil and have overlapping parts with the orthographic projection of the vehicle-mounted end coil according to the received position information of the vehicle-mounted end coil.
The system is further improved in that the system also comprises a ground end rectifying circuit, a ground end filter circuit, a full-bridge inverter circuit, a ground end resonant circuit and a ground end matrix type coil which are sequentially connected;
the ground end rectifying circuit is used for rectifying alternating current acquired from a power grid into direct current and then transmitting the rectified direct current to the ground end filter circuit;
the ground end filter circuit is used for filtering the direct current and transmitting the filtered direct current to the full-bridge inverter circuit;
the full-bridge inverter circuit is used for converting the filtered direct current into high-frequency alternating current meeting the requirement of the ground-end matrix coil;
and the ground end resonance circuit is used for converting the high-frequency alternating current into a high-frequency alternating magnetic field of the sub-coil of the ground end matrix type coil.
The system is further improved in that the system further comprises a vehicle-mounted end resonance circuit, a vehicle-mounted end rectification circuit, a vehicle-mounted end filter circuit and an energy storage module which are sequentially connected;
the vehicle-mounted end resonance circuit is used for converting the high-frequency alternating magnetic field received by the vehicle-mounted end coil into high-frequency alternating current and transmitting the high-frequency alternating current to the vehicle-mounted end resonance circuit;
the vehicle-mounted end rectifying circuit is used for converting the high-frequency alternating current into direct current and transmitting the direct current to the vehicle-mounted end filtering circuit;
and the vehicle-mounted end filter circuit is used for filtering the direct current and charging the energy storage module after filtering.
The vehicle-mounted end resonant circuit comprises a third inductor and a third capacitor, wherein one end of the third inductor is connected with the first input end of the vehicle-mounted end rectifying circuit, and the third inductor is connected with the second input end of the vehicle-mounted end rectifying circuit through the third capacitor.
A further development of the invention is that the positioning sensor is a near field communication module.
The ground wireless charging system comprises a ground end rectifying circuit, a ground end filtering circuit, a full-bridge inverter circuit, a ground end resonant circuit and a ground end matrix coil which are sequentially connected;
the ground end matrix type coil comprises a plurality of sub-coils arranged in a matrix form;
the ground end rectifying circuit is used for rectifying alternating current acquired from a power grid into direct current and then transmitting the rectified direct current to the ground end filter circuit;
the ground end filter circuit is used for filtering the direct current and transmitting the filtered direct current to the full-bridge inverter circuit;
the full-bridge inverter circuit is used for converting the filtered direct current into high-frequency alternating current meeting the requirement of the ground-end matrix coil;
and the ground end resonance circuit is used for converting the high-frequency alternating current into a high-frequency alternating magnetic field of the sub-coil of the ground end matrix type coil.
The ground end resonance circuit comprises a plurality of resonance circuits, each resonance circuit comprises a first inductor, a first capacitor, a second capacitor and a second inductor, a first output end of the full-bridge inverter circuit is connected with the first inductor, the other end of the first inductor is respectively connected with one end of the second capacitor and one end of the first capacitor, the other end of the second capacitor is connected with an input end of the full-bridge inverter circuit through the second inductor, and the other end of the first capacitor is connected with a second output end of the full-bridge inverter circuit.
Compared with the prior art, the invention has the following beneficial effects:
because the ground end matrix coil adopted in the invention comprises a plurality of sub-coils arranged in a matrix form, the position of the vehicle-mounted end coil is orthographically projected onto the ground end matrix coil comprising the plurality of sub-coils arranged in the matrix form, and all the sub-coils in the ground end matrix coil, which have an overlapping part with the orthographical projection of the vehicle-mounted end coil, are started, so that the high-efficiency charging of the electric automobile can be realized.
According to the invention, by arranging a ground end matrix type coil, a positioning sensor detects the position of a vehicle-mounted end coil through a vehicle-mounted end sensor and sends the position information of the vehicle-mounted end coil to a processor; and after the judgment of the processor, obtaining the position of the electric vehicle, and opening a sub-coil which is in the ground end matrix type coil and has an overlapped part with the orthographic projection of the vehicle-mounted end coil according to the position information of the electric vehicle.
According to the invention, all the sub-coils in the ground end matrix type coil, which have the overlapped part with the orthographic projection of the vehicle-mounted end coil, are opened according to the alignment condition of the vehicle-mounted end coil and the ground end coil, so that the charging of the electric automobile is realized, the coil loss can be reduced, and the energy is saved. According to the invention, accurate alignment of the vehicle-mounted end coil and the ground end coil is not required, and only the sub-coil is required to be aligned, so that electric energy can be transmitted with higher power even if a certain position deviation exists between the vehicle-mounted end coil and the receiving end coil. The charging system has low requirement on the accuracy of the parking position of the wireless charging electric vehicle, only needs to be parked in a specified parking area, and does not need to ensure that the vehicle-mounted end coil is just opposite to the ground end coil, so that efficient wireless charging can be realized. The loss of the system can be reduced to the minimum while ensuring the transmission efficiency.
Furthermore, in the invention, the high-frequency alternating magnetic field received by the vehicle-mounted end coil is converted into high-frequency alternating current through the vehicle-mounted end resonance circuit, the high-frequency alternating current is converted into direct current through the vehicle-mounted end rectifying circuit, and the direct current is filtered by the vehicle-mounted end filtering circuit and then charges the energy storage module, thereby realizing the high-efficiency charging of the electric automobile.
Drawings
Fig. 1 is a circuit topology diagram of an electric vehicle wireless charging system.
Fig. 2 is a schematic diagram of a ground-end matrix coil structure.
Fig. 3 is a schematic structural diagram of the ground end matrix type coil and the vehicle-mounted end coil facing each other.
Fig. 4 is a diagram of the working state of the ground-end matrix coil. Wherein, the nine coils are opened in the step (a), and the four coils are opened in the step (b).
In the drawing, 1 is a first sub-coil, 2 is a second sub-coil, 3 is a third sub-coil, 4 is a fourth sub-coil, 5 is a fifth sub-coil, 6 is a sixth sub-coil, 7 is a seventh sub-coil, 8 is an eighth sub-coil, 9 is a ninth sub-coil, 10 is a matrix coil, 11 is a vehicle-mounted end coil, and 12 is a positioning sensor.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The invention provides an electric vehicle wireless charging system with strong anti-offset characteristic, which is mainly designed with a novel coil structure, so that the transmission efficiency is ensured, and the loss of the system can be reduced to the minimum.
A wireless charging method for an electric vehicle comprises the following steps:
according to the detected position of the vehicle-mounted end coil, orthographically projecting the position of the vehicle-mounted end coil onto a ground end matrix coil comprising a plurality of sub-coils arranged in a matrix form, starting all sub-coils in the ground end matrix coil, which have overlapping parts with the orthographically projected position of the vehicle-mounted end coil, and wirelessly charging the electric automobile.
Be provided with a plurality of positioning sensor in the matrix type coil of ground end, every positioning sensor can sign at least one sub-coil, detects on-vehicle end coil position when positioning sensor, opens all sub-coils that positioning sensor can sign, carries out wireless charging to electric automobile.
Referring to fig. 1, a ground wireless charging system includes a ground rectifier circuit, a ground filter circuit, a full-bridge inverter circuit, a ground resonant circuit, and a ground matrix coil, which are connected in sequence;
the ground end matrix type coil comprises a plurality of sub-coils arranged in a matrix form;
the ground end rectifying circuit is used for rectifying alternating current acquired from a power grid into direct current and then transmitting the rectified direct current to the ground end filter circuit;
the ground end filter circuit is used for filtering the direct current and transmitting the filtered direct current to the full-bridge inverter circuit;
the full-bridge inverter circuit is used for converting the filtered direct current into high-frequency alternating current meeting the requirement of the ground-end matrix coil;
and the ground end resonance circuit is used for converting the high-frequency alternating current into a high-frequency alternating magnetic field of the sub-coil of the ground end matrix type coil.
A ground end rectifying circuit, a ground end filter circuit, a full-bridge inverter circuit, a magnetic coupling mechanism, a vehicle-mounted end rectifying circuit and a vehicle-mounted end filter circuit form a circuit topology, and a ground end resonant circuit, a ground end matrix coil, a vehicle-mounted end resonant circuit, a vehicle-mounted end coil and a control circuit form the magnetic coupling mechanism.
The circuit topology part is mainly designed aiming at the compensation circuit topology; the ground end matrix type coil consists of nine sub-coils and is a main body part of the invention; and four positioning sensors 12 are used for determining the position of the vehicle-mounted end coil 11 and opening corresponding sub-coils. The circuit topology of the wireless charging system of the electric automobile is shown in fig. 1, and the installation positions of the matrix type coil 10 and the sensor are shown in fig. 3.
The invention discloses a wireless charging system of an electric automobile, which comprises a ground end matrix type coil, a vehicle-mounted end coil, a positioning sensor, a processor and a control circuit, wherein the ground end matrix type coil is arranged on the vehicle-mounted end coil;
the ground end matrix type coil comprises a plurality of sub-coils arranged in a matrix form;
the positioning sensor is used for detecting the position of the vehicle-mounted end coil;
the processor is used for judging the position information of the coil at the vehicle-mounted end and sending the position information to the control circuit;
and the control circuit is used for opening all sub-coils which are arranged in the ground end matrix type coil and have overlapping parts with the orthographic projection of the vehicle-mounted end coil according to the received position information of the vehicle-mounted end coil.
The system takes alternating current from a power grid, the alternating current is rectified into direct current through a ground end rectifying circuit, and the direct current is filtered by a ground end filter circuit and then is connected to a full-bridge inverter circuit to be converted into high-frequency alternating current. The high-frequency alternating current is transmitted to the vehicle-mounted end through the magnetic coupling mechanism, converted into direct current through the vehicle-mounted end rectifying circuit, filtered by the vehicle-mounted end filtering circuit and transmitted to the electric automobile to charge the electric automobile.
The invention designs an LCC-S resonant circuit. Specifically, referring to fig. 1, the ground-side resonant circuit includes 9 identical resonant circuits, each resonant circuit being defined by a first inductor LpiA first capacitor CpiA second capacitor CsiAnd a second inductorLsi(i is 1,2,3 … … 9), a first output terminal of the full bridge inverter circuit and a first inductor LpiConnected to a first inductor LpiThe other end of the first capacitor is respectively connected with a second capacitor CsiAnd a first capacitor CpiIs connected to one end of a second capacitor CsiVia a second inductor LsiA first capacitor C connected to the second output terminal of the full-bridge inverter circuitpiThe other end of the second resonant circuit is connected with the second output end of the full-bridge inverter circuit, and each resonant circuit is connected with one sub-coil.
Output end and first inductor L in full-bridge inverter circuitpiConnected, the current output from the full-bridge inverter circuit is output from the first inductor Lpi( i 1,2,3 … … 9) flows into the ground resonance circuit and the second capacitor CsiAnd a second inductor Lsi(i-1, 2,3 … … 9) are connected in series, and the branch formed by the series connection is connected with the first capacitor Cpi(i is 1,2,3 … … 9) are connected in parallel to form a T-shaped structure. In an LCC resonant circuit, multiple resonance states exist. Second capacitor CsiAnd a second inductor Lsi(i-1, 2,3 … … 9) is in series resonance, and the second capacitor CsiA second inductor LsiAnd a first capacitor Cpi(i ═ 1,2,3 … … 9) is connected in parallel to the first inductance LpiIn a series resonant state.
The vehicle-mounted end resonant circuit comprises a third inductor LvAnd a third capacitance CvThird inductance LvIs connected with the first input end of the vehicle-mounted end rectifying circuit, and a third inductor LvThe other end of which is connected to a third capacitor CvIs connected to one end of a third capacitor CvThe other end of the first rectifying circuit is connected with a second input end of the vehicle-mounted end rectifying circuit. And the vehicle-mounted end rectifying circuit is connected with an energy storage module of the electric automobile through the vehicle-mounted end filtering circuit.
The vehicle-mounted end resonant circuit consists of a third inductor L connected in seriesvA third capacitor CvThe two circuit elements adopt a series circuit topology, and the third inductor LvA third capacitor CvIn a series resonant state. Meanwhile, it is to be noted that the resonance frequency of the resonance circuit on the ground side and the resonance frequency of the resonance circuit on the vehicle sideIt needs to be kept at the same 85kHz, which is also the switching frequency of the MOSFETs (corresponding to Q1-Q4 in fig. 1). The ground-side resonant circuit and the vehicle-side resonant circuit are in resonance matching, so that energy can be wirelessly transmitted therebetween. By adopting LCC-S resonance topology and serially connecting capacitors, the current on the transmitting coil can be adjusted, and the direct current component on the power supply side can be isolated, so that the direct current magnetization of the transmission coil is avoided, and the transmission performance of the coil is prompted.
The key point that the wireless charging system of the electric automobile can realize the strong anti-deviation characteristic lies in the newly designed wireless transmission electric energy ground end matrix type coil. The wireless transmission electric energy ground end matrix type coil is composed of nine sub-coils which are connected in parallel and arranged in three rows, each row of three sub-coils, four sub-coils in two adjacent rows form a square matrix unit, and the center of each matrix unit is provided with a positioning sensor;
each sub-coil forms an independent unit in the matrix coil, and each independent unit can be controlled. The overall size of the ground-end matrix coil is 1.7 x 1.7m, and the overall appearance is square. Nine sub-coils in the square also present a square shape, each size is 0.5 multiplied by 0.5m, the distance between each sub-coil and the adjacent sub-coil is 0.1m, the number of turns of each sub-coil is 20, and the nine sub-coils are connected in parallel. The ground-end matrix coil is shown in fig. 2. Nine sub-coils of the ground end matrix type coil are arranged in three rows, each row of the nine sub-coils comprises three sub-coils, four sub-coils in two adjacent rows form a square matrix unit, and the center of each matrix unit is provided with a positioning sensor; and if the positioning sensor detects the vehicle-mounted end coil, the four sub-coils near the positioning sensor are switched on.
Specifically, the positioning sensor comprises a first positioning sensor, a second positioning sensor, a third positioning sensor and a fourth positioning sensor;
the matrix type coil comprises three rows of sub-coils, each row of three sub-coils comprises a first row of a first sub-coil 1, a second sub-coil 2 and a third sub-coil 3 which are sequentially arranged from left to right, a second row of a fourth sub-coil 4, a fifth sub-coil 5 and a sixth sub-coil 6 which are sequentially arranged from left to right, a third row of a seventh sub-coil 7, an eighth sub-coil 8 and a ninth sub-coil 9 which are sequentially arranged from left to right, a first positioning sensor is arranged at the center of a matrix unit formed by the first sub-coil 1, the second sub-coil 2, the fourth sub-coil 4 and the fifth sub-coil 5, a second positioning sensor is arranged at the center of a matrix unit formed by the second sub-coil 2, the third sub-coil 3, the fifth sub-coil 5 and the sixth sub-coil 6, a third positioning sensor is arranged at the center of a matrix unit formed by the fourth sub-coil 4, the fifth sub-coil 5, the seventh sub-coil 7 and the eighth sub-coil 8, and a fourth positioning sensor is arranged at the center of a matrix unit formed by the fifth sub-coil 5, the sixth sub-coil 6, the eighth sub-coil 8 and the ninth sub-coil 9. When one positioning sensor detects the vehicle-mounted end coil, four sub-coils of the matrix unit where the positioning sensor is located are switched on.
And when the four positioning sensors detect the vehicle-mounted end coil, all the sub-coils are switched on.
For example, in the case of fig. 4 (a), when the first positioning sensor detects the vehicle-mounted end coil, the first sub-coil 1, the second sub-coil 2, the fourth sub-coil 4, and the fifth sub-coil 5 in the vicinity thereof are turned on, and electric energy is wirelessly transmitted to the vehicle-mounted end coil. Meanwhile, the third sub-coil 3, the sixth sub-coil 6, the seventh sub-coil 7, the eighth sub-coil 8 and the ninth sub-coil 9 are closed, so that coil loss is reduced, and energy is saved. Here, a special case may occur, as shown in fig. 4 (b), when four positioning sensors all detect the vehicle-mounted end coil, it indicates that the center of the vehicle-mounted end coil is directly opposite to the center of the ground-end matrix coil, and at this time, all the sub-coils of the first sub-coil 1 to the ninth sub-coil 9 are turned on, so as to transmit electric energy to the vehicle-mounted end coil with maximum transmission power.
The positioning sensor can adopt a Near field communication module (Near field communication), the positioning sensor at the ground end adopts an NFC Near field communication module, and the vehicle-mounted end is also provided with a corresponding NFC Near field communication module. Only two NFC near-field communication modules in close proximity can identify each other, which meets the relevant requirements of the present invention. After the two NFC near field communication modules at the vehicle-mounted end and the ground end are mutually identified, the positions of the electric vehicles at present are obtained through judgment of the processor, corresponding opening signals are sent to the corresponding sub-coils of the ground end matrix type coil, and the work of opening the ground end coil is completed.
The position sensor is installed at the intersection of four matrix units in the matrix coil array, as shown in fig. 3, which takes a nine-matrix coil unit as an example, and the installation position of the position sensor is shown by a black circle in the figure. According to the ground end coil size and the vehicle end coil size, the installation mode can judge the position of the electric vehicle in a lowest cost mode.
The invention provides a wireless charging system with strong anti-offset characteristic for an electric vehicle, which is implemented by adopting a mode that a vehicle-mounted end coil and a ground end matrix coil generate magnetic coupling to transmit electric energy. And a matrix type coil array is adopted at the transmitting end, and corresponding sub-coils in the matrix type coils at the ground end are opened according to the position of the electric automobile. The invention can realize the monitoring of the position of the electric automobile and the disconnection of the sub-coils in the matrix type coil unit at the ground end.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A wireless charging method for an electric vehicle is characterized by comprising the following steps:
according to the detected position of the vehicle-mounted end coil, orthographically projecting the position of the vehicle-mounted end coil onto a ground end matrix coil comprising a plurality of sub-coils arranged in a matrix form, starting all sub-coils in the ground end matrix coil, which have overlapping parts with the orthographically projected position of the vehicle-mounted end coil, and wirelessly charging the electric automobile.
2. The wireless charging method for the electric automobile according to claim 1, wherein a plurality of positioning sensors are arranged in the ground end matrix coil, each positioning sensor can identify at least one sub-coil, and when the positioning sensors detect the position of the vehicle-mounted end coil, all the sub-coils which can be identified by the positioning sensors are started to wirelessly charge the electric automobile.
3. The utility model provides a wireless charging system of electric automobile which characterized in that includes: the system comprises a ground end matrix type coil, a vehicle-mounted end coil, a positioning sensor, a processor and a control circuit;
the ground end matrix type coil comprises a plurality of sub-coils arranged in a matrix form;
the positioning sensor is used for detecting the position of the vehicle-mounted end coil;
the processor is used for judging the position information of the coil at the vehicle-mounted end and sending the position information to the control circuit;
and the control circuit is used for opening all sub-coils which are arranged in the ground end matrix type coil and have overlapping parts with the orthographic projection of the vehicle-mounted end coil according to the received position information of the vehicle-mounted end coil.
4. The wireless charging system of claim 3, further comprising a ground-side rectifying circuit, a ground-side filtering circuit, a full-bridge inverter circuit, a ground-side resonant circuit and a ground-side matrix coil, which are connected in sequence;
the ground end rectifying circuit is used for rectifying alternating current acquired from a power grid into direct current and then transmitting the rectified direct current to the ground end filter circuit;
the ground end filter circuit is used for filtering the direct current and transmitting the filtered direct current to the full-bridge inverter circuit;
the full-bridge inverter circuit is used for converting the filtered direct current into high-frequency alternating current meeting the requirement of the ground-end matrix coil;
and the ground end resonance circuit is used for converting the high-frequency alternating current into a high-frequency alternating magnetic field of the sub-coil of the ground end matrix type coil.
5. The wireless charging system of the electric automobile according to claim 3, characterized in that the system further comprises a vehicle-mounted end resonant circuit, a vehicle-mounted end rectifying circuit, a vehicle-mounted end filtering circuit and an energy storage module which are connected in sequence;
the vehicle-mounted end resonance circuit is used for converting the high-frequency alternating magnetic field received by the vehicle-mounted end coil into high-frequency alternating current and transmitting the high-frequency alternating current to the vehicle-mounted end resonance circuit;
the vehicle-mounted end rectifying circuit is used for converting the high-frequency alternating current into direct current and transmitting the direct current to the vehicle-mounted end filtering circuit;
and the vehicle-mounted end filter circuit is used for filtering the direct current and charging the energy storage module after filtering.
6. The wireless charging system of claim 5, wherein the vehicle-mounted resonant circuit comprises a third inductor (L)v) And a third capacitance (C)v) Third inductance (L)v) Is connected to the first input terminal of the on-board terminal rectifying circuit, and a third inductor (L)v) Via a third capacitor (C)v) And the second input end of the vehicle-mounted end rectifying circuit is connected.
7. The wireless charging system for electric vehicles according to claim 3, wherein the positioning sensor is a near field communication module.
8. The ground wireless charging system is characterized by comprising a ground end rectifying circuit, a ground end filtering circuit, a full-bridge inverter circuit, a ground end resonant circuit and a ground end matrix coil which are sequentially connected;
the ground end matrix type coil comprises a plurality of sub-coils arranged in a matrix form;
the ground end rectifying circuit is used for rectifying alternating current acquired from a power grid into direct current and then transmitting the rectified direct current to the ground end filter circuit;
the ground end filter circuit is used for filtering the direct current and transmitting the filtered direct current to the full-bridge inverter circuit;
the full-bridge inverter circuit is used for converting the filtered direct current into high-frequency alternating current meeting the requirement of the ground-end matrix coil;
and the ground end resonance circuit is used for converting the high-frequency alternating current into a high-frequency alternating magnetic field of the sub-coil of the ground end matrix type coil.
9. A ground wireless charging system according to claim 8, characterized in that the ground side resonance circuit comprises several resonance circuits, each resonance circuit comprising a first inductance (L)pi) A first capacitor (C)pi) A second capacitor (C)si) And a second inductance (L)si) First output terminal and first inductor (L) of full bridge inverter circuitpi) Connected to a first inductor (L)pi) Respectively with a second capacitor (C)si) And a first capacitor (C)pi) Is connected to one terminal of a second capacitor (C)si) Via a second inductor (L)si) A first capacitor (C) connected to the input terminal of the full-bridge inverter circuitpi) And the other end of the second inverter is connected with the second output end of the full-bridge inverter circuit.
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