CN115549326A - Power-drop-resistant multi-stage guide rail wireless energy transmission system - Google Patents

Power-drop-resistant multi-stage guide rail wireless energy transmission system Download PDF

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Publication number
CN115549326A
CN115549326A CN202211367491.4A CN202211367491A CN115549326A CN 115549326 A CN115549326 A CN 115549326A CN 202211367491 A CN202211367491 A CN 202211367491A CN 115549326 A CN115549326 A CN 115549326A
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Prior art keywords
coil
energy
transmission system
width
energy transmitting
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Chinese (zh)
Inventor
谭森林
赵鱼名
辛芳
苗金龙
李巍
经廷伟
詹文杰
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Chongqing Qianwei Radio Power Transmission Research Institute Co ltd
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Chongqing Qianwei Radio Power Transmission Research Institute Co ltd
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Priority to CN202211367491.4A priority Critical patent/CN115549326A/en
Publication of CN115549326A publication Critical patent/CN115549326A/en
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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
    • 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
    • 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
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Current-Collector Devices For Electrically Propelled Vehicles (AREA)

Abstract

The invention relates to the technical field of wireless energy transmission, and particularly discloses a power-drop-resistant multi-stage guide rail wireless energy transmission system which comprises a primary side transmitting mechanism and a secondary side receiving mechanism. The system adopts an 8-shaped winding form to wind an outer coil and an energy receiving coil of an energy transmitting coil, the winding direction of an inner coil of the energy transmitting coil is opposite to that of a corresponding outer coil, and the magnetic field intensity at the center of the energy transmitting coil is the same as that at the center between two adjacent energy transmitting coils by controlling the number of turns of the inner coil, so that the magnetic field intensity on the energy transmitting coil of the whole guide rail is the same, and then the power supply can be kept stable on the whole guide rail.

Description

Power-drop-resistant multi-stage guide rail wireless energy transmission system
Technical Field
The invention relates to the technical field of wireless energy transmission, in particular to a power-drop-resistant multi-stage guide rail wireless energy transmission system.
Background
The dynamic wireless charging system is a wireless energy transmission system capable of wirelessly charging the electric equipment in the motion process of the electric equipment, and the wireless charging system of the electric automobile is a typical application.
In dynamic charging systems, two magnetic coupling schemes are typically used for implementation. One is a long guide rail type structure, and the other is a sectional type guide rail structure (multistage guide rail). The long guide structure is constituted by a coil having a dimension much longer than that of the pickup coil in the pickup end moving direction. Instead, the short track structure consists of a series of coils that are the same size as the pick-up coils. The long guide rail structure is researched mainly based on two reasons that the number of ground power supply equipment needed for simultaneously supplying power to a plurality of electric automobiles and less ground power supply equipment is convenient. However, the long rail structure necessarily results in a very small coupling coefficient between the launch end and the pick-up end. The long distance of the transmitter side coil also necessarily results in a large parasitic resistance. The above two fatal drawbacks can cause the system to have low efficiency and serious electromagnetic interference problems. In contrast, the segmented track structure lends itself only to the portion actually coupled to the pick-up coil, which helps to improve the energy transfer efficiency and to avoid electromagnetic field radiation from the uncoupled track portion. Therefore, a segmented rail structure is generally adopted as an electromagnetic coupling scheme of a dynamic wireless charging system.
In the application scene of the multi-stage guide rail wireless energy transmission, the power supply power is required to be stable, the multi-stage energy transmitting coils are flatly laid on the guide rail, a certain gap is formed between every two stages of energy transmitting coils, and if a conventional single rectangular transmitting coil scheme is adopted, the power supply power can greatly drop when the energy receiving coils pass through the middle area of the two stages of energy transmitting coils.
The invention patent application 202210017721.8, entitled "winding method of energy transmitting coil and multi-stage guide rail wireless energy transmission system", discloses a technology of power drop resistance, wherein a plurality of compensation coils are wound in the same winding direction in a main coil, when dynamic wireless energy transmission is performed facing a pickup end, the method can be applied to a scene with a longer energy transmission section of the main coil under the action of the compensation coils, and can counteract power consumption caused by parasitic resistance of the main coil, but the winding mode of the energy transmitting coil is too complex, if the method is applied to actual engineering, the difficulty of automatically winding the energy transmitting coil is very high, and the difficulty of engineering implementation is large.
Disclosure of Invention
The invention provides a power-drop-resistant multi-stage guide rail wireless energy transmission system, which solves the technical problems that: the winding mode of the energy transmitting coil in the existing multi-stage guide rail wireless energy transmission system is too complex, and is not beneficial to engineering implementation.
In order to solve the technical problems, the invention provides a power-drop-resistant multi-stage guide rail wireless energy transmission system which comprises a primary side transmitting mechanism and a secondary side receiving mechanism, wherein the primary side transmitting mechanism is formed by laying a plurality of energy transmitting coils at equal intervals along the width direction of the energy transmitting coils, and the secondary side receiving mechanism comprises energy receiving coils;
the energy transmitting coil is wound by the following steps:
s1, winding an outer coil in an 8-shaped winding form, wherein the number of turns of the outer coil is a 1 The diameter of the wire is d and the width is w p Height of h p ；
S2, reversely winding an inner layer coil in each of the upper rectangular coil and the lower rectangular coil of the outer layer coil, wherein the number of turns of the inner layer coil is a 2 Width is w in And obtaining the energy transmitting coil.
Specifically, the energy emitting coil is required to be vertically and horizontally symmetrical by winding the outer coil and winding the inner coil.
Specifically, in step S2, the number of turns a of the inner coil is set to 2 Satisfies the following conditions:
Figure BDA0003923957570000021
wherein s represents a distance between two adjacent energy transmitting coils; w represents the width of the energy receiving coil corresponding to the energy transmitting coil.
In particular, the width w of the inner coil in Satisfies the following conditions:
w in ＝w p -w。
specifically, the energy receiving coil adopts the same 8-shaped winding form as the energy transmitting coil.
Specifically, the energy transmitting coil and the energy receiving coil are wound into a double layer.
In particular, the height h of the outer coil p Less than the height h of the energy receiving coil.
Specifically, the width w of the outer coil p Is set to be more than 2 times of the width w of the energy receiving coil.
Specifically, the width w and the height h of the receiving coil and the distance s between two adjacent energy transmitting coils are determined according to practical engineering application.
The invention provides a power drop resistant multistage guide rail wireless energy transmission system, which is characterized in that an outer coil and an energy receiving coil of an energy transmitting coil are wound in an 8-shaped winding form, the winding direction of an inner coil of the energy transmitting coil is opposite to that of a corresponding outer coil, and the magnetic field intensity in the center of the energy transmitting coil is the same as that between two adjacent energy transmitting coils by controlling the number of turns of the inner coil winding, so that the magnetic field intensity on the energy transmitting coil of the whole guide rail is the same, and the power supply power can be kept stable on the whole guide rail.
Drawings
Fig. 1 is a top view of two adjacent energy transmitting coils (a transmitting coil 1 and a transmitting coil 2) provided by an embodiment of the present invention;
FIG. 2 is a top view of an energy receiving coil provided by an embodiment of the present invention;
FIG. 3 is a diagram of a simulation model of a magnetic coupling mechanism provided by an embodiment of the present invention;
fig. 4 is a diagram of simulation results provided by an embodiment of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, which are given solely for the purpose of illustration and are not to be construed as limitations of the invention, including the drawings which are incorporated herein by reference and for illustration only and are not to be construed as limitations of the invention, since many variations thereof are possible without departing from the spirit and scope of the invention.
In order to enable power supply to be stable on the whole guide rail, the embodiment of the invention provides a power-drop-resistant multistage guide rail wireless energy transmission system which comprises a primary side transmitting mechanism and a secondary side receiving mechanism, wherein the primary side transmitting mechanism is formed by laying a plurality of energy transmitting coils at equal intervals along the width direction of the primary side transmitting mechanism, and the secondary side receiving mechanism comprises an energy receiving coil and a magnetic core.
Fig. 1 shows a top view of two adjacent energy transmission coils (transmission coil 1 and transmission coil 2).
Referring to fig. 1, each energy transmitting coil is wound by the following steps:
s1, winding an outer coil in an 8-shaped winding form, wherein the number of turns of the outer coil is a 1 The wire diameter is d and the width is w p Height of h p ；
S2, respectively reversely winding an inner layer coil in the upper rectangular coil and the lower rectangular coil of the outer layer coil, wherein the number of turns of the inner layer coil is a 2 Width of w in And obtaining the energy transmitting coil.
The direction of current flow in fig. 1 represents the direction of winding. And a magnetic core is laid below each energy receiving coil. For stable power transmission, the winding of the outer coil and the winding of the inner coil need to make the energy transmitting coil vertically and horizontally symmetrical. The distance between the transmitter coils 1 and 2 is s.
As shown in fig. 2, for better energy pick-up, the energy receiving coil takes the same form of 8-shaped winding as the energy transmitting coil, and has a width w and a height h.
In practical engineering applications, w, h, s are given, and then it is necessary to design the inner coil of the transmitting coil with appropriate number of turns and area (width x height). Suppose the number of turns of the outer coil is a 1 D is wire diameter and w is primary coil width p Height of h p In the absence of the inner coil, the mutual inductance of the two coils is h when the receiver coil is in the middle of the transmitter coil 1 1 The mutual inductance of the two coils is h in the middle of the transmitter coil 1 and the transmitter coil 2 2 Ideally, h 1 And h 2 In a relationship of
Figure BDA0003923957570000041
By rewinding a inside the transmitter coil 1 2 A turn inner coil, the mutual inductance of the two coils is h when the energy receiving coil is arranged in the middle of the transmitting coil 1 3 Ideally, h 1 And h 3 In a relationship of
Figure BDA0003923957570000042
Let h 2 ＝h 3 Is obtained by
Figure BDA0003923957570000043
Width w of inner coil in ＝w p -w。
In order to obtain higher transmission efficiency and power, the energy transmitting coil and the energy receiving coil are wound into a double layer, and the height h of the outer layer coil p Less than the height h of the energy receiving coil and the width w of the outer coil p The width w of the energy receiving coil is set to be more than 2 times.
The power-drop-resistant multi-stage guide rail wireless energy transmission system provided by the embodiment of the invention adopts an 8-shaped winding form to wind an outer coil and an energy receiving coil of an energy transmitting coil, the winding direction of an inner coil of the energy transmitting coil is opposite to that of a corresponding outer coil, and the magnetic field intensity of the center of the energy transmitting coil is the same as that of the center between two adjacent energy transmitting coils by controlling the number of turns of the inner coil, so that the magnetic field intensity of the energy transmitting coil of the whole guide rail is the same, and the power supply power can be kept stable on the whole guide rail.
Experimental verification is performed below. Taking the application in an electric vehicle as an example, the corresponding basic parameters are set as follows:
width w of the energy transmitting coil p ：350mm；
Height h of energy transmitting coil p ：170mm；
Outer coil turn number a of energy transmitting coil 1 :6 turns of double layers, and 12 turns in total;
inner coil turn number a of energy transmitting coil 2 :2 turns of double layers, 4 turns in total;
width of energy receiving coil: 165mm;
height of energy receiving coil: 190mm;
number of turns of energy receiving coil: 6 turns of double layers, and 12 turns in total;
distance between energy transmitting coil and energy receiving coil (wireless transmission distance): 22mm;
operating frequency of the system: 85kHz.
The simulation model is shown in fig. 3, the simulation result is shown in fig. 4, and it can be seen from fig. 4 that when the energy receiving coil is at the center of the transmitting coil 1 and at the center between the transmitting coil 1 and the transmitting coil 2, the mutual inductance values between the transmitting coil and the receiving coil are 82.71uH and 82.68uH respectively, the difference is only 0.03uH, and there is almost no mutual inductance dip, which also means there is almost no power dip, thus verifying the feasibility of the system.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims (9)

1. A multi-stage guide rail wireless energy transmission system capable of resisting power drop comprises a primary side transmitting mechanism and a secondary side receiving mechanism, and is characterized in that the primary side transmitting mechanism is formed by laying a plurality of energy transmitting coils at equal intervals along the width direction of the energy transmitting coils, and the secondary side receiving mechanism comprises an energy receiving coil;
the energy transmitting coil is wound by the following steps:
s1, winding an outer coil in an 8-shaped winding form, wherein the number of turns of the outer coil is a 1 The diameter of the wire is d and the width is w p Height of h p ；
S2, respectively reversely winding an inner layer coil in the upper rectangular coil and the lower rectangular coil of the outer layer coil, wherein the number of turns of the inner layer coil is a 2 Width of w in And obtaining the energy transmitting coil.
2. The multi-stage guideway wireless energy transmission system for resisting power drop according to claim 1, wherein: the winding of the outer coil and the winding of the inner coil need to make the energy transmitting coil vertically and horizontally symmetrical.
3. The power-drop-resistant multi-stage guide rail wireless energy transmission system according to claim 2, wherein in step S2, the number of turns a of the inner coil is 2 Satisfies the following conditions:
Figure FDA0003923957560000011
wherein s represents a distance between two adjacent energy transmitting coils; w represents the width of the energy receiving coil corresponding to the energy transmitting coil.
4. The multi-stage rail wireless energy transfer system with power droop resistance according to claim 3, wherein the width w of the inner coil in Satisfies the following conditions:
w in ＝w p -w。
5. the multi-stage rail wireless energy transmission system resisting power drop according to claim 4, wherein: the energy receiving coil is in the same 8-shaped winding form as the energy transmitting coil.
6. The multi-stage guideway wireless energy transmission system for resisting power drop according to claim 1, wherein: the energy transmitting coil and the energy receiving coil are wound into a double layer.
7. The multi-stage guideway wireless energy transmission system for resisting power drop according to claim 1, wherein: height h of the outer coil p Less than the height h of the energy receiving coil.
8. The multi-stage guideway wireless energy transmission system for resisting power drop according to claim 1, wherein: width w of the outer coil p Is set to be more than 2 times of the width w of the energy receiving coil.
9. The multi-stage guideway wireless energy transmission system for resisting power drop according to claim 1, wherein: and determining the width w and the height h of the receiving coil and the distance s between two adjacent energy transmitting coils according to practical engineering application.
CN202211367491.4A 2022-11-03 2022-11-03 Power-drop-resistant multi-stage guide rail wireless energy transmission system Pending CN115549326A (en)

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