CN111845389A - Energy transmission device - Google Patents
Energy transmission device Download PDFInfo
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- CN111845389A CN111845389A CN201910350087.8A CN201910350087A CN111845389A CN 111845389 A CN111845389 A CN 111845389A CN 201910350087 A CN201910350087 A CN 201910350087A CN 111845389 A CN111845389 A CN 111845389A
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- energy
- coil
- mutual inductance
- magnetic core
- shielding plate
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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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- 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 an energy transmission device, which comprises an energy transmitting device and an energy receiving device, wherein the energy transmitting device comprises a mutual inductance suppression coil, an energy transmitting coil and a mutual inductance compensation coil; the number of the energy transmitting coils is at least 2; the mutual inductance suppression coil and the mutual inductance compensation coil are arranged in pairs in the segmentation areas of two adjacent energy emitting coils, the mutual inductance suppression coil is arranged below the energy emitting coils, and the mutual inductance compensation coil is arranged above the energy emitting coils; the energy transmitting device transmits energy through the energy transmitting coil, and the energy receiving device receives energy through the energy receiving coil. The method has the advantages that the stability of the energy transmitting coil and the energy receiving coil in the charging process can be improved, the stability of mutual inductance of the energy receiving coil passing through the energy transmitting coil segmentation area is improved, and the like.
Description
Technical Field
The invention relates to the technical field of wireless charging, in particular to an energy transmission device, and particularly relates to a wireless energy transmission device for an electric vehicle.
Background
With the continuous development of electric vehicle technology, a wireless charging system (wireless energy transmission system) is also paid more and more attention, and electromagnetic coupling parameters of a traditional wireless energy transmission device can be changed along with the movement of a vehicle, so that the system in a resonance state is detuned originally, the loss of a switching device is increased, the service life of the switching device is shortened, the output power of the system is reduced, and the efficiency of the system is reduced. As shown in fig. 1, when a vehicle moves through the segment region of the transmitting coil, the self-inductance and mutual-inductance of the transmitting coil gradually decrease, the output current of the inverter increases, the induced voltage of the receiving coil decreases, the turn-on and turn-off losses of the switching tube increase, and the output power and efficiency of the system decrease. Meanwhile, the wireless energy transmission device in the prior art also has the defects that the primary coil is complex in structure and large in engineering difficulty, the self inductance of the primary coil can change along with the position change of the electric automobile, the system is detuned, the system efficiency is reduced and the like.
Patent application No. 201510216700.9 entitled "penetrating type guide rail structure for dynamic wireless power supply of electric vehicle", patent application No. 201510502810.1 entitled "magnetic field shielding device for wireless energy transmission system", is a background document of the present application.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems in the prior art, the invention provides an energy transmission device which can improve the stability of an energy transmitting coil and an energy receiving coil in the charging process and the stability of mutual inductance of the energy receiving coil passing through a segmentation region of the energy transmitting coil.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: an energy transmission device comprises an energy transmitting device and an energy receiving device, wherein the energy transmitting device comprises a mutual inductance suppression coil, an energy transmitting coil and a mutual inductance compensation coil;
the number of the energy transmitting coils is at least 2;
the mutual inductance suppression coil and the mutual inductance compensation coil are arranged in pairs in the segmentation areas of two adjacent energy emitting coils, the mutual inductance suppression coil is arranged below the energy emitting coils, and the mutual inductance compensation coil is arranged above the energy emitting coils;
The energy transmitting device transmits energy through the energy transmitting coil, and the energy receiving device receives energy through the energy receiving coil.
Further, the mutual inductance suppression coil and the mutual inductance compensation coil have the same size and are arranged in an overlapping manner.
Further, the energy transmission device further comprises a first magnetic core; the first magnetic core is arranged below the mutual inductance suppression coil; the projection area of the first magnetic core on the horizontal plane is larger than or equal to the projection area of the energy transmitting coil on the horizontal plane.
Further, the energy receiving device comprises an energy receiving coil and a second magnetic core;
the second magnetic core is disposed above the energy-receiving coil.
Further, a shielding plate is arranged between the second magnetic core and the energy receiving coil;
the second magnetic core and the shielding plate are arranged in pairs, and the second magnetic core and the shielding plate are arranged in an overlapped mode in the vertical direction.
Further, the projection of the shielding plate on the horizontal plane is greater than or equal to the projection of the second magnetic core on the horizontal plane.
Further, the number of pairs of the second magnetic core and the shielding plate is 4 to 12, and the second magnetic core and the shielding plate are arranged in a circumferential array.
Further, the mutual inductance suppression coil, the mutual inductance compensation coil and the energy receiving coil are the same in size.
Further, the distance between the second magnetic core and the shielding plate in the vertical direction is greater than or equal to 5 mm.
Further, the shielding plate is an aluminum plate.
Compared with the prior art, the invention has the advantages that:
1. the energy transmission device can improve the stability of self-inductance of the energy transmitting coil and the energy receiving coil in the charging process of the energy receiving device through the energy transmitting device, so that the energy transmitting coil and the energy receiving coil are in a basically unchanged state, and the energy transmission system is ensured to be in a stable resonance state, thereby prolonging the service life of a switching device in a wireless charging system and increasing the efficiency of the wireless charging system.
2. The invention can ensure the stability of mutual inductance when the energy receiving device passes through the sectional area of the energy transmitting coil, and ensure that the charging output power of the wireless charging system is in a relatively stable state.
3. The energy receiving device is provided with the second magnetic core and the shielding plate, so that the magnetic radiation on the bottom of a vehicle carrying the energy receiving device can be effectively reduced.
Drawings
Fig. 1 is a schematic diagram of a compensation topology of a wireless energy transmission system in the prior art.
Fig. 2 is a schematic structural diagram of the energy transmission device of the present invention.
Fig. 3 is an enlarged view of a portion of the structure of fig. 2 according to the present invention.
Fig. 4 is a schematic structural diagram of an energy receiving device of the present invention.
Fig. 5 is a graph illustrating a trend of inductance change of the energy transmission device during a charging process.
Fig. 6 is a graph showing the variation trend of mutual inductance during the charging process of the energy transmission device of the present invention.
Fig. 7 is a schematic diagram of the mutual inductance suppression coil during charging of the energy transfer device of the present invention.
Fig. 8 is a schematic diagram illustrating the comparison of the electromagnetic shielding effect of the energy receiving device during the charging process of the energy transmission device of the present invention.
Illustration of the drawings: 1. a first magnetic core; 2. a mutual inductance suppression coil; 3. an energy emitting coil; 4. a mutual inductance compensation coil; 5. a second magnetic core; 6. a shielding plate; 7. an energy receiving coil.
Detailed Description
The invention is further described below with reference to the drawings and specific preferred embodiments of the description, without thereby limiting the scope of protection of the invention.
As shown in fig. 2 and 3, the energy transmission device of the present embodiment includes an energy transmitting device and an energy receiving device, the energy transmitting device includes a mutual inductance suppression coil, an energy transmitting coil and a mutual inductance compensation coil; the number of the energy transmitting coils is at least 2; the mutual inductance suppression coil and the mutual inductance compensation coil are arranged in pairs in the segmentation areas of the two adjacent energy emitting coils, the mutual inductance suppression coil is arranged below the energy emitting coils, and the mutual inductance compensation coil is arranged above the energy emitting coils; the energy transmitting device transmits energy through the energy transmitting coil, and the energy receiving device receives energy through the energy receiving coil. The mutual inductance suppression coil and the mutual inductance compensation coil have the same size and are arranged in an overlapping mode. The energy emitting device further comprises a first magnetic core; the first magnetic core is arranged below the mutual inductance suppression coil; the projection area of the first magnetic core on the horizontal plane is larger than or equal to the projection area of the energy transmitting coil on the horizontal plane.
In the present embodiment, the first magnetic core increases the mutual inductance between the energy-transmitting coil and the energy-receiving coil by changing the magnetic path. The energy transmitting coil is preferably arranged above the first magnetic core in a long guide pattern, although the energy transmitting coil may also have other shapes, such as rectangular, circular, etc.
In the present embodiment, as shown in fig. 2 and 3, a case having two energy transmission coils is explained as an example. The two energy transmitting coils are positioned on the same horizontal plane and are arranged above the first magnetic cores side by side. The area where the two energy transmitting coils are close to each other is the segmentation area. The mutual inductance suppression coil is located below the segment region, i.e., between the energy transmitting coil and the first magnetic core, and the mutual inductance compensation coil is located above the segment region. The mutual inductance suppression coil and the mutual inductance compensation coil are overlapped in the vertical direction. Preferably, the mutual inductance suppression coil and the mutual inductance compensation coil have the same size; further preferably, the coil winding turns and the like are identical in number. The direction of the current in the mutual inductance compensation coil is the same as the direction of the current in the energy transmitting coil. When an energy receiving coil in the energy receiving device moves along with a vehicle (for an electric vehicle adopting a wireless charging mode), when the energy receiving coil passes through a subsection area of an energy transmitting coil, namely the area of a mutual inductance compensation coil, the mutual inductance between the energy receiving coil and the energy transmitting coil is gradually reduced, when the energy receiving coil is positioned right above the subsection area of the two energy transmitting coils, the mutual inductance is reduced to the minimum, and the mutual inductance between the mutual inductance compensation coil and the receiving coil is gradually increased so as to maintain the mutual inductance of the energy receiving coil to be stable. The mutual inductance suppression coil has the current direction opposite to that of the energy transmitting coil, and the mutual inductance compensation coil has the effect of eliminating the influence of the mutual inductance compensation coil on the energy transmitting coil.
In the present embodiment, as shown in fig. 4, the energy receiving device includes an energy receiving coil, a second magnetic core; the second magnetic core is disposed above the energy receiving coil. The energy receiving coil is preferably a spiral coil to increase the mutual inductance between the energy receiving coil and the transmitting coil; further preferably, a shielding plate is further provided between the second magnetic core and the energy receiving coil; the second magnetic core and the shielding plate are arranged in pairs, and the second magnetic core and the shielding plate are arranged in an overlapped mode in the vertical direction. Namely, the second magnetic core is positioned right above the shielding plate, so that the shielding plate is positioned on a main magnetic line loop of the energy receiving coil and the energy transmitting coil, and the magnetic radiation is effectively reduced. Further, the projection of the shielding plate on the horizontal plane is greater than or equal to the projection of the second magnetic core on the horizontal plane. That is, the size of the shielding plate is equal to or larger than the size of the second magnetic core, and preferably, the size of the shielding plate is equal to the size of the second magnetic core.
In this embodiment, the number of pairs of the second magnetic core and the shield plate is 4 to 12 pairs, and is arranged in a circumferential array. Preferably 8 pairs. The mutual inductance suppression coil, the mutual inductance compensation coil and the energy receiving coil are the same in size. Further preferably, a vertical distance between the second magnetic core and the shielding plate is not less than 5 mm. The shield plate is preferably an aluminum plate.
In this embodiment, the technical effects of the present invention are further analyzed through specific experimental procedures and experimental data. As shown in fig. 2, when the energy receiving device moves from the position shown in fig. 2 to the other end along the energy transmitting device, the self-inductance and mutual inductance of the energy transmitting coil (transmitting coil) and the energy receiving coil (receiving coil) change as shown in fig. 5, and as can be seen from fig. 5, when the energy receiving device passes through the segmented regions of the energy transmitting device, the self-inductance of the energy transmitting coil and the self-inductance of the energy receiving coil can be kept stable, but the mutual inductance between the two is reduced, and when the mutual inductance compensating coil is added to the segmented regions of the transmitting coil, the mutual inductance simulation result of the energy receiving device is shown in fig. 6. As can be seen from fig. 6, when an energy receiving device passes through an energy transmitting coil segmented region without adding a mutual inductance compensation stub, the mutual inductance will largely fall off, and if the interval of the segmented region is large, the mutual inductance will even be reduced to 0; however, after the mutual inductance compensation coil is added in the subsection area of the energy transmitting coil, the mutual inductance stability of the energy receiving coil can be ensured, so that the energy receiving coil can continuously receive energy and continuously charge a charged device (such as an electric vehicle and a tramcar).
In order to eliminate the influence of the mutual inductance compensation coil on the energy transmitting coil, the mutual inductance suppression coil is added in the application, the effect is shown in fig. 7, and it can be seen from fig. 7 that the mutual inductance suppression coil well reduces the influence of the mutual inductance compensation coil on the energy transmitting coil under the condition of ensuring that the mutual inductance compensation of the mutual inductance compensation coil on the energy receiving coil is not influenced.
In the practical application scene, the energy transmitting device is generally installed on the ground, and the energy receiving device is generally installed at the bottom of the electric vehicle, so that the electric vehicle can be wirelessly charged when passing through the energy transmitting device. If the magnetic shield structure, then, the vehicle bottom part of electric motor car will receive stronger magnetic radiation, and through the scheme of this application, after increasing the shield plate, the magnetic radiation that the electric motor car vehicle bottom received will have and reduce by a wide margin.
Magnetic shielding structure has been added in this application and has not added magnetic shielding structure, and the magnetic induction intensity of energy receiving device top compares as shown in fig. 8, can see out after having added magnetic shielding structure, can effectually reduce energy coupling device to the radiation of surrounding environment.
The foregoing is considered as illustrative of the preferred embodiments of the invention and is not to be construed as limiting the invention in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (10)
1. An energy transmission device, comprising an energy emitting device and an energy receiving device, characterized in that: the energy transmitting device comprises a mutual inductance suppression coil, an energy transmitting coil and a mutual inductance compensation coil;
the number of the energy transmitting coils is at least 2;
the mutual inductance suppression coil and the mutual inductance compensation coil are arranged in pairs in the segmentation areas of two adjacent energy emitting coils, the mutual inductance suppression coil is arranged below the energy emitting coils, and the mutual inductance compensation coil is arranged above the energy emitting coils;
the energy transmitting device transmits energy through the energy transmitting coil, and the energy receiving device receives energy through the energy receiving coil.
2. The energy transfer device of claim 1, wherein: the mutual inductance suppression coil and the mutual inductance compensation coil are identical in size and are arranged in an overlapping mode.
3. The energy transfer device of claim 1, wherein: the energy emitting device further comprises a first magnetic core; the first magnetic core is arranged below the mutual inductance suppression coil; the projection area of the first magnetic core on the horizontal plane is larger than or equal to the projection area of the energy transmitting coil on the horizontal plane.
4. The energy transmission device according to any one of claims 1 to 3, characterized in that: the energy receiving device comprises an energy receiving coil and a second magnetic core;
the second magnetic core is disposed above the energy-receiving coil.
5. The energy transfer device of claim 4, wherein: a shielding plate is further arranged between the second magnetic core and the energy receiving coil;
the second magnetic core and the shielding plate are arranged in pairs, and the second magnetic core and the shielding plate are arranged in an overlapped mode in the vertical direction.
6. The energy transfer device of claim 5, wherein: the projection of the shielding plate on the horizontal plane is larger than or equal to the projection of the second magnetic core on the horizontal plane.
7. The energy transfer device of claim 6, wherein: the number of pairs of the second magnetic core and the shielding plate is 4-12, and the second magnetic core and the shielding plate are arranged in a circumferential array.
8. The energy transfer device of claim 7, wherein: the mutual inductance suppression coil, the mutual inductance compensation coil and the energy receiving coil are the same in size.
9. The energy transfer device of claim 8, wherein: the interval distance between the second magnetic core and the shielding plate in the vertical direction is more than or equal to 5 mm.
10. The energy transfer device of claim 9, wherein: the shielding plate is an aluminum plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910350087.8A CN111845389B (en) | 2019-04-28 | 2019-04-28 | Energy transmission device |
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| CN201910350087.8A CN111845389B (en) | 2019-04-28 | 2019-04-28 | Energy transmission device |
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| CN111845389A true CN111845389A (en) | 2020-10-30 |
| CN111845389B CN111845389B (en) | 2022-06-07 |
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