CN115313676B - Magnetic coupling mechanism for dynamic wireless charging - Google Patents
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- CN115313676B CN115313676B CN202210832629.7A CN202210832629A CN115313676B CN 115313676 B CN115313676 B CN 115313676B CN 202210832629 A CN202210832629 A CN 202210832629A CN 115313676 B CN115313676 B CN 115313676B
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- 238000013461 design Methods 0.000 claims description 5
- 229910001289 Manganese-zinc ferrite Inorganic materials 0.000 claims description 3
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/005—Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
- H02J50/402—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
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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
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Current-Collector Devices For Electrically Propelled Vehicles (AREA)
Abstract
The invention discloses a magnetic coupling mechanism for dynamic wireless charging, which comprises: a transmitting end and a receiving end. The transmitting end is a rectangular solenoid coil paved in a continuous and sectional mode, paved below a road, and can generate a coupling magnetic field for electric energy transmission after high-frequency alternating current is introduced; the receiving end is overlapped with the receiving end in three layers, wherein the first layer is a receiving coil 1, the second layer is a receiving coil 2, and the third layer is a magnetic core; the receiving end is used for receiving the electric energy transmitted by the transmitting end, and the magnetic core layer is positioned at the uppermost layer. The whole set of device can reduce total coupling mutual inductance fluctuation when the receiving end moves to the junction of the transmitting coil, keep the power of the receiving end stable, and meet the scene requirement under mobile wireless charging or offset charging.
Description
Technical Field
The invention relates to the technical field of wireless power transmission, in particular to a magnetic coupling mechanism for dynamic wireless charging.
Background
At present, most of energy supplements of electric energy equipment are charged in a wired mode, and the charging mode has the problems of poor flexibility of wired connection with a charging pile, poor safety of frequent plugging and unplugging of a charging interface, ageing of a circuit, easiness in electric shock and the like. The wireless power transmission technology is used as a new electric energy supply technology, so that new propelling force is added for the development of an electric energy source technology, and the technology adopts non-contact power supply and has the advantages of flexibility, safety and the like. The dynamic wireless charging technology is based on static wireless charging, and the transmitting coil is paved under a road to supply real-time energy in the moving process of the receiving equipment, so that the two problems of short endurance mileage and high battery cost caused by the battery energy supply of the equipment are fundamentally solved, and the dynamic wireless charging technology has a wide application prospect.
The dynamic wireless charging system is mainly divided into a short sectional type and a long guide rail type according to the length of the power supply distance of a single transmitting coil, wherein the short sectional type transmitting coil is similar to a receiving coil in size, and the device is powered in real time by continuously paving on a road surface. At present, the short-segment dynamic wireless charging technology has more technical bottleneck problems to be solved, and particularly has more problems to be solved in the aspects of a plurality of theories and technical researches such as magnetic coupling mechanism design, optimization and the like.
The magnetic coupling mechanism is a key link for realizing wireless power supply of equipment and is necessary for structural design thereof. At present, an electric energy pickup mechanism of equipment inevitably generates offset relative to a transmitting coil in a moving process of a short-segment type dynamic wireless charging system, and the transmitting coil is switched in real time along with the position of the equipment, so that the problem of power fluctuation of a receiving end is caused. The power fluctuation of the system interferes with the normal operation of electric equipment, and particularly when the power fluctuation is large, larger element stress can be brought to the system device, so that the system safety is threatened. Therefore, the dynamic magnetic coupling mechanism with strong anti-offset performance is designed, and the dynamic magnetic coupling mechanism can still be coupled to stable mutual inductance when a receiving end runs to the junction of a transmitting coil, so that the dynamic magnetic coupling mechanism is a problem to be solved.
The wireless power transmission coupling mechanism for the on-line monitoring equipment on the ultra-high voltage transmission line in the prior art 1 (CN 114123535A) comprises: a transmitting end and a receiving end; the transmitting end comprises a first coil, a second coil and a transmitting end magnetic core which are connected in series, and the receiving end comprises a receiving coil and a receiving end magnetic core; according to the invention, the uniformity of magnetic flux density distribution is improved by optimizing the internal structure of the transmitting end, so that the magnetic core utilization rate of the wireless power transmission coupling mechanism is remarkably improved, and the wireless power transmission coupling mechanism is more suitable for long-distance large-current wireless power transmission. The disadvantages of the prior art document 1 are that: the anti-offset performance of the coil is poor, if the relative position of the coil is slightly offset, the transmission power and the energy transmission efficiency of the system can be drastically reduced, so that the magnetic coupling mechanism is only suitable for a static wireless charging scene in which the relative position of the transmitting coil and the receiving coil is kept unchanged. Aiming at the problem that the mutual inductance drop of the receiving coil is generated under the offset condition, the fluctuation of the transmission power and the transmission efficiency of the system is further caused, the distributed improvement is carried out on the receiving coil, so that the coupling mutual inductance can be maintained under the condition that the receiving end is offset, the power stability of the receiving end is realized, and the method is suitable for dynamic wireless charging occasions under the continuous motion of the receiving end.
Prior art 2 (CN 112653255A) "a wireless charging coupling mechanism and wireless charging device" includes a transmitting coil module, a receiving coil module, and an isolation ferrite; the transmitting coil module comprises a plurality of transmitting coils and a first ferrite substrate, wherein the plurality of transmitting coils and the isolation ferrite are arranged on the first ferrite substrate, and the isolation ferrite is used for separating the plurality of transmitting coils; the receiving coil module is arranged on the isolation ferrite. The disadvantages of the prior art document 2 are that: although the transmitting coil adopts a plurality of sub-coils and isolation ferrite, so that the non-uniform area of the magnetic field is reduced, and stable coupling mutual inductance can be still obtained under the condition that a certain offset exists in the receiving end coil, the structure requires that the area of the receiving end coil is smaller than that of the transmitting coil, and if the area of the receiving end coil is larger than that of the transmitting coil, stable coupling mutual inductance can not be obtained under the condition that the offset exists. Secondly, the structure needs to wind more coils and lay more ferrite under the same coupling area, which is not beneficial to reducing the cost. The coil area of the receiving end is the same as that of the transmitting coil, the coupling area is larger, and the coupling mutual inductance value of the unit coil is larger. The transmitting coil is spirally wound, so that less conducting wire material is needed for generating the same magnetic field strength under unit area, and the construction cost is saved.
Disclosure of Invention
In order to solve the defects existing in the prior art, the invention aims to provide the following steps: aiming at the prior art, a magnetic coupling mechanism for dynamic wireless charging is provided, and the power fluctuation stability of a receiving end of electric energy equipment in a moving state is realized.
The invention adopts the following technical scheme.
A magnetic coupling mechanism for dynamic wireless charging, comprising: transmitting terminal and receiving terminal, the transmitting terminal includes rectangle solenoid coil, and the receiving terminal includes: a receiving coil 1, a receiving coil 2 and a magnetic core, characterized in that,
The rectangular solenoid coil of the transmitting end is paved under a road in a segmented way, and a coupling magnetic field is generated for electric energy transmission after high-frequency alternating current is introduced;
The receiving coil 1 at the receiving end, the receiving coil 2 and the magnetic core are overlapped up and down in three layers, wherein the first layer from bottom to top is the receiving coil 1, the second layer is the receiving coil 2, and the third layer is the magnetic core;
The receiving end is used for receiving the electric energy transmitted by the transmitting end.
Preferably, the method comprises the steps of,
The receiving coil 1 is of a square structure, the coil winding mode is a plane spiral type, and the number of turns is N;
The receiving coil 2 is a DD coil, the coil winding mode is a plane spiral type, and the number of turns is N.
The magnetic core is manganese zinc ferrite with space magnetic conduction effect.
The planar shape of the core is the same as the receiving coil 1.
The receiving coil 2 comprises two rectangular planar spiral coils which are connected in series in reverse winding mode.
Preferably, the rectangular planar spiral coil has an aspect ratio of 1:2.
The sizes of the outer edges of the magnetic core, the receiving coil 2 and the receiving coil 1 are the same, the receiving coil 2 and the receiving coil 1 are connected in parallel, and the three-layer structure is tightly attached.
The solenoid coil, the wire of receiving coil 1 and receiving coil 2 adopts stranded litz wire structure, and the wire skin parcel has polyimide insulating skin.
Preferably, the width of the rectangular solenoid coil at the transmitting end is equal to the width of the rectangular solenoid coil at the receiving end 1, the length of the rectangular solenoid coil is l, the width is b, and the transmission distance of the coupling mechanism is z, so that the design size and the energy transmission distance of the coupling mechanism satisfy the following formula:
In the method, in the process of the invention,
B represents the width of the rectangular solenoid coil,
L represents the length of the rectangular solenoid coil,
Z represents the transmission distance of the coupling mechanism.
Preferably, the i+1th rectangular solenoid coil winding mode of the transmitting end is opposite to the i rectangular solenoid coil winding mode, the parameters of the coils are the same, the connecting modes are parallel, the current is introduced in phase, and the magnetic induction intensity B crossing the same space period distance l meets the following formula;
Bi+1(x+l)＝-Bi(x) (2)
In the method, in the process of the invention,
B represents the magnetic induction intensity of the magnetic field,
X represents the planar offset of the receive coil relative to the transmit coil,
I represents the ith rectangular solenoid coil,
B i (x) represents the magnetic induction of the ith rectangular solenoid coil.
The invention has the advantages that compared with the prior art,
The invention provides a magnetic coupling mechanism for dynamic wireless charging, wherein a receiving end coil adopts a three-layer overlapping structure, the receiving end coil is respectively coupled according to magnetic field characteristics when equipment runs at different positions, mutual inductance fluctuation of the receiving end when the receiving end runs at the junction of a transmitting coil is stabilized, and the power stability of the receiving end of a dynamic wireless charging system in the moving process of the equipment is realized.
Drawings
FIG. 1 is a schematic diagram of a magnetic coupling mechanism for dynamic wireless charging according to the present invention;
FIG. 2 is a schematic diagram of the dynamic wireless charging system of the present invention during movement of a device;
FIG. 3 is a diagram showing the winding of the transmitting coil and the current flow direction of the magnetic coupling mechanism according to the present invention;
fig. 4 is a schematic diagram showing the winding mode and current flow direction of the receiving coil 1 and the receiving coil 2 of the magnetic coupling mechanism according to the present invention;
fig. 5 is a graph of the coupling inductance of each coil of the receiving end and the total coupling inductance of the magnetic coupling structure of the present invention in an operating state.
Detailed Description
The application is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and are not intended to limit the scope of the present application.
Example 1.
As shown in fig. 1, a magnetic coupling mechanism for dynamic wireless charging, comprising: a transmitting end and a receiving end.
The transmitting end includes rectangle solenoid coil, and the receiving end includes: a receiving coil 1, a receiving coil 2 and a magnetic core, characterized in that,
The rectangular solenoid coil of the transmitting end is paved under a road in a segmented way, and a coupling magnetic field is generated for electric energy transmission after high-frequency alternating current is introduced;
the receiving coil 1 at the receiving end, the receiving coil 2 and the magnetic core are overlapped up and down in three layers, wherein the first layer from bottom to top is the receiving coil 1, the second layer is the receiving coil 2, and the third layer is the magnetic core; the receiving end is used for receiving the electric energy transmitted by the transmitting end.
In this embodiment, preferably, the receiving coil 1 has a square structure, the coil winding mode is a planar spiral type, and the number of turns is N; the receiving coil 2 is a DD coil, the coil winding mode is a plane spiral type, and the number of turns is N.
The magnetic core is manganese zinc ferrite with space magnetic conduction effect, and the plane shape of the magnetic core is the same as that of the receiving coil 1.
The receiving coil 2 comprises two rectangular plane spiral coils, and the two rectangular plane spiral coils are connected in series in an inverted winding mode; the aspect ratio of the rectangular planar spiral coil is 1:2.
The sizes of the outer edges of the magnetic core, the receiving coil 2 and the receiving coil 1 are the same, the receiving coil 2 and the receiving coil 1 are connected in parallel, and the three-layer structure is tightly attached.
In this embodiment, preferably, the wires of the solenoid coil, the receiving coil 1 and the receiving coil 2 adopt a multi-strand litz wire structure, and the outer layers of the wires are wrapped with polyimide insulating covers.
As shown in fig. 2, the rectangular solenoid coil at the transmitting end is continuously laid in the traveling direction of the road surface, the width of the rectangular solenoid coil at the transmitting end is equal to the width of the coil 1 at the receiving end, the length of the rectangular solenoid coil is l, the width is b, and the transmission distance of the coupling mechanism is z, so that the design size and the energy transmission distance of the coupling mechanism satisfy:
In the method, in the process of the invention,
B represents the width of the rectangular solenoid coil,
L represents the length of the rectangular solenoid coil,
Z represents the transmission distance of the coupling mechanism.
The formula (1) ensures that the middle part of the coil of the sectional type coupling mechanism unit generates a vertical and relatively uniform magnetic field.
As shown in fig. 3, the winding mode of the transmitting coil 1 is that the i+1th rectangular solenoid coil winding mode of the transmitting end is opposite to the i rectangular solenoid coil winding mode, the parameters of the coils are the same, the connecting modes are parallel, the current is introduced in phase, and the magnetic induction intensity B crossing the same space period distance l meets the formula (2).
Bi+1(x+l)＝-Bi(x) (2)
In the method, in the process of the invention,
B represents the magnetic induction intensity of the magnetic field,
X represents the planar offset of the receive coil relative to the transmit coil,
I represents the ith rectangular solenoid coil,
B i (x) represents the magnetic induction of the ith rectangular solenoid coil.
Equation (2) illustrates that the z-axis magnetic field generated by adjacent transmit coils is reversed, and for a square receive coil 1, the sign of the mutual inductance of the adjacent transmit coils is opposite to that of the coupling.
The winding mode of the transmitting coil 2 is shown in fig. 4, and the structure is a DD structure, and the two sub-coils are connected in series and wound in opposite directions, and are bipolar coil structures.
The coupling principle of the coupling mechanism of the invention is as follows:
The unit coil at the transmitting end is regarded as a unipolar coil, the magnetic field generated above the unit coil is mainly a single magnetic field in the vertical direction, the mutual inductance between the receiving coil 2 and the unit coil at the upper part is almost 0, the square receiving coil 1 in the main receiving end plays a coupling role, and the movement of the coupling mechanism at the receiving end almost does not cause fluctuation of mutual inductance between the unit coil and the receiving end when the unit coil at the transmitting end is arranged above the transmitting end. The fluctuation of the mutual inductance value between the magnetic coupling mechanisms mainly occurs at the junction between the unit coils of the receiving end and the transmitting end. When the receiving end runs to the junction of the transmitting coils, the receiving coil 1 in the receiving end receives the reverse coupling magnetic field of the next transmitting coil, and magnetic fluxes are mutually counteracted, and the mutual inductance is 0 from the peak value at the moment; and the winding directions of the two sub-coils in the receiving coil 2 are opposite, the coupling magnetic fields are opposite, the coupling mutual inductance is lifted to a peak value from 0, the mutual inductance drop of the receiving coil 2 and the mutual inductance lifting of the receiving coil 1 are mutually offset, and the overall mutual inductance is kept unchanged.
The number of turns n=8 of the transmitting and receiving coils 1 and 2 is set, the length l=1.5 m, the width b=0.4 m, the energy transmission distance z=0.2 m, the coupling mutual inductance of the receiving coils 1 and 2 and the total coupling mutual inductance of the receiving end are shown in fig. 5, and it can be seen that the total mutual inductance of the receiving end is kept constant.
Compared with the prior art, the magnetic coupling mechanism for dynamic wireless charging has the advantages that the receiving end coil adopts a three-layer overlapping structure, the receiving end coil is respectively coupled according to magnetic field characteristics when equipment runs at different positions, mutual inductance fluctuation is stabilized when the receiving end runs at the junction of the transmitting coil, and the power stability of the receiving end of the dynamic wireless charging system in the moving process of the equipment is realized.
While the applicant has described and illustrated the embodiments of the present invention in detail with reference to the drawings, it should be understood by those skilled in the art that the above embodiments are only preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not to limit the scope of the present invention, but any improvements or modifications based on the spirit of the present invention should fall within the scope of the present invention.
Claims (4)
1. A magnetic coupling mechanism for dynamic wireless charging, comprising: transmitting terminal and receiving terminal, the transmitting terminal includes rectangle solenoid coil, and the receiving terminal includes: a receiving coil 1, a receiving coil 2 and a magnetic core, characterized in that,
The rectangular solenoid coil of the transmitting end is paved under a road in a segmented way, and a coupling magnetic field is generated for electric energy transmission after high-frequency alternating current is introduced; the i+1th rectangular solenoid coil winding mode of the transmitting end is opposite to the i rectangular solenoid coil winding mode, the parameters of the coils are the same, the connecting modes are parallel, and the current is introduced in phase;
The receiving coil 1 at the receiving end, the receiving coil 2 and the magnetic core are overlapped up and down in three layers, wherein the first layer from bottom to top is the receiving coil 1, the second layer is the receiving coil 2, and the third layer is the magnetic core; the receiving coil 1 is of a square structure, the coil winding mode is a plane spiral type, and the number of turns is N; the receiving coil 2 is a DD coil, the coil winding mode is a plane spiral type, and the number of turns is N; the planar shape of the magnetic core is the same as that of the receiving coil 1; the receiving coil 2 comprises two rectangular plane spiral coils which are reversely wound and connected in series; the aspect ratio of the rectangular planar spiral coil is 1:2; the sizes of the outer edges of the magnetic core, the receiving coil 2 and the receiving coil 1 are the same, the receiving coil 2 and the receiving coil 1 are connected in parallel, and the three-layer structure is tightly attached;
the receiving end is used for receiving the electric energy transmitted by the transmitting end;
The width of the rectangular solenoid coil at the transmitting end is equal to that of the coil at the receiving end, and then the design size and the energy transmission distance of the coupling mechanism meet the following formula:
In the method, in the process of the invention,
B represents the width of the rectangular solenoid coil,
L represents the length of the rectangular solenoid coil,
Z represents the transmission distance of the coupling mechanism.
2. A magnetic coupling mechanism for dynamic wireless charging according to claim 1, wherein,
The magnetic core is manganese zinc ferrite with space magnetic conduction effect.
3. A magnetic coupling mechanism for dynamic wireless charging according to claim 1, wherein,
The solenoid coil, the wire of receiving coil 1 and receiving coil 2 adopts stranded litz wire structure, and the wire skin parcel has polyimide insulating skin.
4. A magnetic coupling mechanism for dynamic wireless charging according to claim 1, wherein,
The magnetic induction intensity of the transmitting end at the distance crossing the same space period meets the following formula;
In the method, in the process of the invention,
B represents the magnetic induction intensity of the magnetic field,
X represents the planar offset of the receive coil relative to the transmit coil,
I represents the ith rectangular solenoid coil,
The magnetic induction intensity of the ith rectangular solenoid coil is shown.
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| CN115313676A (en) | 2022-11-08 |
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