CN109756034B - Transmission distance self-adaptation and reconfigurable receiving coil - Google Patents
Transmission distance self-adaptation and reconfigurable receiving coil Download PDFInfo
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- CN109756034B CN109756034B CN201811637970.7A CN201811637970A CN109756034B CN 109756034 B CN109756034 B CN 109756034B CN 201811637970 A CN201811637970 A CN 201811637970A CN 109756034 B CN109756034 B CN 109756034B
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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
- Y02T90/14—Plug-in electric vehicles
Abstract
The invention discloses a transmission distance self-adaptive and reconfigurable receiving coil, wherein a plurality of additional coils with solenoid structures are symmetrically arranged on the inner side or the outer side of the receiving coil, each additional coil is connected with the receiving coil in a mode of positive and negative connection controlled by a switch, and when the transmission distance between a transmitting coil and the receiving coil is changed, the number of the additional coils switched into the receiving coil is controlled, so that the magnetic flux of the receiving coil is kept unchanged. When the transmission distance between the transmitting coil and the receiving coil is changed, the invention weakens or compensates the magnetic flux of the receiving coil, maintains the mutual inductance of the transmitting coil and the receiving coil to be constant, thereby ensuring the constant transmission power of the system.
Description
Technical Field
The invention relates to a wireless power transmission technology, in particular to a transmission distance height self-adaptive reconfigurable receiving coil.
Background
Electric Vehicles (EVs) and plug-in hybrid vehicles (PHEVs) are being popularized by various countries in order to save traditional energy and minimize the harmful effects of environmental pollution. However, due to the high cost, heavy weight, low capacity of batteries, and the limitations of charging infrastructure, the charging problem has become a bottleneck limiting the development of electric vehicles. The wireless charging technology can solve the problems of limitation of charging infrastructure and safety of the traditional charging technology, brings great attention to researchers, and gradually becomes a main mode of charging of the electric automobile.
The magnetic coupling resonance type wireless power transmission technology is a main mode for wirelessly charging the electric automobile by virtue of the advantages of higher energy transmission power and efficiency, longer transmission distance, stricter transmission direction requirement and the like. The coil structure is the key of the magnetic coupling resonant wireless power transmission technology. The disc-type spiral structure is a coil structure which is currently applied to wireless charging of an electric automobile, has a higher coupling coefficient and a no-load quality factor and occupies a smaller space, but when the transmission distance between a transmitting coil and a receiving coil is changed, the magnetic flux passing through the receiving coil can be changed, the mutual inductance between the coils is influenced, the transmission power is changed, and the charging effect and the service life of a battery can be influenced.
Disclosure of Invention
The invention aims to provide a construction method of a transmission distance highly-adaptive reconfigurable receiving coil, which realizes the constant magnetic flux of the receiving coil when the transmission distance of the coil changes and improves the unstable condition of output power when the transmission distance of the coil changes.
The technical solution for realizing the purpose of the invention is as follows: when the transmission distance between a transmitting coil and a receiving coil is changed, the number of the additional coils switched into the receiving coil is controlled, and the magnetic flux of the receiving coil is kept unchanged.
As a preferred embodiment, the number of turns N' of the additional coil satisfies the following relationship:
wherein N is the number of turns of the original receiving coil; r opt-0.2 Represents the optimum radius of the receiving coil at a transmission distance of 0.2m, phi opt (0.2,R opt-0.2 ) The transmission distance is 0.2m, and the radius of the receiving coil is R opt-0.2 Magnetic flux in time; phi (0.3 opt-0.2 ) For increasing the transmission distance to 0.3m, the radius of the receiving coil is R opt-0.2 The magnetic flux of time; r opt-03 Represents the optimum radius of the receiving coil at a transmission distance of 0.3m, phi (0.3 opt-03 ) For increasing the transmission distance to 0.3m, the radius of the receiving coil is R opt-03 The magnetic flux of time;
maximum radius R of additional coil max And the radius R of each turn of the additional coil Attachment(s) The following relationship is satisfied:
where N' is the additional number of coil turns.
As a preferred embodiment, a specific method for controlling the number of additional coils switched into the receiving coil is as follows:
step 2, when the transmission distance between the transmitting coil and the receiving coil changes, controlling the number of additional coils which are thrown into the receiving coil, and keeping the output power constant;
if the distance is increased, the additional coils are connected into the receiving coil in a positive connection mode, and the number of the connected additional coils is controlled until the difference value between the compensated output current and the original output current is smaller than a set threshold value;
and if the distance is reduced, the additional coils are connected into the receiving coil in a reverse connection mode, and the number of the connected additional coils is controlled until the difference value between the weakened output current and the original output current is smaller than the set threshold value.
As a preferred embodiment, 8 additional coils are provided inside or outside the receiver coil.
Compared with the prior coil structure, the invention has the remarkable advantages that: when the transmission distance between the transmitting coil and the receiving coil is changed, the invention weakens or compensates the magnetic flux of the receiving coil, so that the magnetic flux is kept constant, thereby ensuring the constant mutual inductance between the transmitting coil and the receiving coil and the constant transmission power of the system.
Drawings
Fig. 1 is a flow chart of the design of the transmission range adaptive and reconfigurable receiving coil of the present invention.
Fig. 2 is a spatial distribution diagram of the transceiver coil.
Fig. 3 is a graph of the magnetic flux of the receiver coil of the present invention as a function of the radius of the receiver coil.
Fig. 4 is a block diagram of a receiver coil of the present invention.
Fig. 5 is a flow chart of a method for maintaining a constant transmission power according to the present invention.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings.
The transmission distance self-adaptive reconfigurable receiving coil is characterized in that a plurality of additional coils of solenoid structures are symmetrically arranged on the inner side or the outer side of the receiving coil, each additional coil is connected with the receiving coil in a positive and negative connection mode controlled by a switch, and when the transmission distance between a transmitting coil and the receiving coil is changed, the number of the additional coils switched into the receiving coil is controlled, so that the magnetic flux of the receiving coil is kept unchanged. When the size of the receiving coil is not strictly required, the form of connecting an additional coil at the outer side can be adopted, and the magnetic flux adjusting device has the advantage of larger capacity of adjusting magnetic flux; the form of connecting the additional coil inside can save the receiving coil space, and the magnetic flux can be constant by controlling the number of the connections and the wiring form.
The theory associated with keeping the output power constant is presented below.
The invention designs the transmitting coil as a disc-type spiral structure, the receiving coil as a space spiral structure, and the space distribution of the transmitting and receiving coils is shown in figure 2. A disc-type spiral coil can be approximately seen to be composed of a plurality of concentric circular rings with the radius changing at equal intervals. Firstly, the magnetic flux generated by a single-turn annular coil in a certain area above the space is calculated, and then the magnetic flux generated by the whole disc type spiral coil in the certain area above the space is calculated by utilizing a superposition algorithm.
Setting the outermost ring of the transmitting coil as the 1 st circular ring and the radius as R, sequentially and inwards arranging n concentric circles, namely the number of turns of the coil is n, considering the distance between the turns of the coil as d and neglecting the size of the wire diameter, setting the radius of the innermost ring as R- (n-1) d, and leading current into the coil as I and mu 0 Is a vacuum magnetic permeability. The transmitting coil is placed on the xOy plane with the ring center O as the origin, and a coordinate system is established with the ring center axis as the z-axis as shown in fig. 2. A point A (xi, yi, 0) is arbitrarily selected on the ith circular ring, beta is an included angle between the point A and the positive direction of the x axis,
let P be H above the toroid, and R be R ’ The center of the circle and the circular ring coil are located on the same z-axis, namely P (x, y, H). The whole radius is R ’ The magnetic field generated along the direction of the z-axis of the space on the circle is equal in size, and the radius is R ’ The magnetic flux generated in the circular area is:
when the radius R =0.2 of the transmitting coil, the transmission distance H is 0.2m and the number of turns of the transmitting coil is 10, the MathCad software is used for making a function image of the formula (1), and the optimal radius R of the receiving coil can be found to exist opt So that the flux passing through reaches a maximum value phi opt As shown in fig. 3. In practical application, the optimal radius R of the receiving coil can be adjusted according to the designed parameters of the transmitting coil opt And corresponding magnetic flux maximum phi opt 。
In the wireless charging system of the electric automobile, the transmission distance between the transmitting coil and the receiving coil, namely the variation range of the distance H between the corresponding ground charging device and the automobile bottom is 0.1m-0.3m. The maximum magnetic flux phi can be found by calculation along with the increase of the transmission distance opt Corresponding optimal radius R of receiving coil opt And gradually increases. Taking the transmission distance H =0.2m as a default position, wherein the optimal radius is R opt-0.2 (ii) a The transmission distance H =0.3m is the farthest position, and the optimal radius at this time is R opt-0.3 . The optimal radius of each turn of the receiving coil is approximately in the following relationship:
R opt ＝R opt-0.2 +0.01(i-1)(i＝1,2,3…N) (2)
where N is the number of turns of the receiving coil.
The number of turns N' of the additional coil is calculated from the flux linkage conservation.
The flux linkage formula is expressed as:
Ψ(H,R opt )＝NΦ opt (H,R opt ) (3)
when H =0.2 m:
Ψ(0.2,R opt-0.2 )＝NΦ opt (0.2,R opt-0.2 ) (4)
assuming that the coil transmission distance H is increased to 0.3, N' turns of additional coils are continuously added on the basis of the original receiving coil, namely, the radius of the receiving coil is increased, and the radius is increased to R opt-0.2 +2R max Maximum radius R of additional coil max And the flux linkage generated by the additional coil and the original receiving coil and the formula are as follows:
Ψ(0.3,R opt-0.3 )＝N'[Φ(0.3,R opt-0.3 )-Φ(0.3,R opt-0.2 )]+NΦ(0.3,R opt-0.2 ) (6)
from the conservation of flux linkage, equation (4) is equal to equation (6), and it can be deduced that the additional coil turns N' satisfy the following relationship:
the additional number of coil turns N' can be calculated from equation (7).
Radius R of each turn of additional coil Attachment(s) The design is as follows:
R attachment(s) ＝R max -0.0005(j-1)j∈(1,2,3…N') (8)
Fig. 4 is a receiving coil and additional coil structure designed by the present invention, and a specific method for keeping the magnetic flux constant and further ensuring the output power constant by using the above structure is as follows:
step 2, when the transmission distance between the transmitting coil and the receiving coil changes, controlling the number of additional coils which are switched into the receiving coil, and keeping the output power constant;
if the distance is increased, the additional coils are connected into the receiving coil in a positive connection mode, and the number of the connected additional coils is controlled until the difference value between the compensated output current and the original output current is smaller than a set threshold value;
if the distance is reduced, the additional coils are connected into the receiving coil in a reverse connection mode, and the number of the connected additional coils is controlled until the difference value between the weakened output current and the original output current is smaller than the set threshold value.
Claims (3)
1. A transmission distance self-adaptive and reconfigurable receiving coil is characterized in that a plurality of additional coils with solenoid structures are symmetrically arranged on the inner side or the outer side of the receiving coil, each additional coil is connected with the receiving coil in a mode of positive and negative connection controlled by a switch, when the transmission distance between a transmitting coil and the receiving coil changes, the number of the additional coils switched into the receiving coil is controlled, and the magnetic flux of the receiving coil is kept unchanged;
the specific method for controlling the number of the additional coils switched into the receiving coil comprises the following steps:
step 1, measuring the transmission distance between a transmitting coil and a receiving coil and the output current of the receiving coil as the original output current for subsequent comparison;
step 2, when the transmission distance between the transmitting coil and the receiving coil changes, controlling the number of additional coils which are thrown into the receiving coil, and keeping the output power constant;
if the distance is increased, the additional coils are connected into the receiving coil in a positive connection mode, and the number of the connected additional coils is controlled until the difference value between the compensated output current and the original output current is smaller than a set threshold value;
if the distance is reduced, the additional coils are connected into the receiving coil in a reverse connection mode, and the number of the connected additional coils is controlled until the difference value between the weakened output current and the original output current is smaller than the set threshold value.
2. The transmission distance adaptive and reconfigurable receiving coil according to claim 1, characterized in that the number of turns N' of the additional coil satisfies the following relationship:
wherein N is the number of turns of the original receiving coil; r opt-0.2 Represents the optimum radius of the receiving coil at a transmission distance of 0.2m, phi opt (0.2,R opt-0.2 ) The transmission distance is 0.2m, and the radius of the receiving coil is R opt-0.2 Magnetic flux in time; phi (0.3,R) opt-0.2 ) For increasing the transmission distance to 0.3m, the radius of the receiving coil is R opt-0.2 Magnetic flux in time; r opt-03 Represents the optimum radius of the receiving coil at a transmission distance of 0.3m, phi (0.3 opt-03 ) For increasing the transmission distance to 0.3m, the radius of the receiving coil is R opt-03 The magnetic flux of time;
maximum radius R of additional coil max And the radius R of each turn of the additional coil Attachment(s) The following relationship is satisfied:
where N' is the additional number of coil turns.
3. Transmission distance adaptive and reconfigurable receive coil according to claim 1, characterized in that 8 additional coils are provided inside or outside the receive coil.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811637970.7A CN109756034B (en) | 2018-12-29 | 2018-12-29 | Transmission distance self-adaptation and reconfigurable receiving coil |
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| CN201811637970.7A CN109756034B (en) | 2018-12-29 | 2018-12-29 | Transmission distance self-adaptation and reconfigurable receiving coil |
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| CN109756034B true CN109756034B (en) | 2022-10-21 |
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| CN110277234B (en) * | 2019-06-29 | 2021-02-05 | 南京理工大学 | Receiving coil capable of keeping output power constant under different transmission distances |
| CN111682652B (en) * | 2020-05-29 | 2021-09-17 | 中国石油天然气集团有限公司 | System and method for dynamically adjusting coupling coefficient of non-contact transmission magnetic mechanism |
| CN114157043B (en) * | 2021-11-10 | 2023-10-31 | 广西电网有限责任公司电力科学研究院 | Wireless charging device and robot capable of being charged wirelessly |
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| CN107565707B (en) * | 2017-08-04 | 2020-05-08 | 河南师范大学 | Optimal switching design method for magnetic coupling electric energy transmission coil |
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