CN115276248A - Omnidirectional wireless electric energy receiving coil and wireless charging system for electric automobile - Google Patents

Omnidirectional wireless electric energy receiving coil and wireless charging system for electric automobile Download PDF

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Publication number
CN115276248A
CN115276248A CN202210840895.4A CN202210840895A CN115276248A CN 115276248 A CN115276248 A CN 115276248A CN 202210840895 A CN202210840895 A CN 202210840895A CN 115276248 A CN115276248 A CN 115276248A
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China
Prior art keywords
magnetic core
winding
receiving coil
wireless power
power receiving
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CN202210840895.4A
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Chinese (zh)
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CN115276248B (en
Inventor
肖静
孙跃
唐春森
吴宁
莫宇鸿
龚文兰
吴晓锐
韩帅
陈绍南
陈卫东
郭敏
郭小璇
王智慧
左志平
李小飞
潘佳佳
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Chongqing University
Electric Power Research Institute of Guangxi Power Grid Co Ltd
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Chongqing University
Electric Power Research Institute of Guangxi Power Grid Co Ltd
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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
    • H02J50/005—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
    • 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
    • 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
    • H01F27/2871—Pancake coils
    • 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
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/14—Inductive couplings
    • 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
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • 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

Abstract

The invention provides an omnidirectional wireless power receiving coil and an electric vehicle wireless charging system, wherein the omnidirectional wireless power receiving coil comprises a square magnetic core, and spiral coils are respectively wound on magnetic core structures on four sides of the square magnetic core, wherein: the two spiral coils which are opposite up and down are wound in opposite directions and are mutually connected in series to serve as a first winding, the two spiral coils which are opposite left and right are wound in opposite directions and are mutually connected in series to serve as a second winding, and planar coils are densely wound along the periphery of the square magnetic core to serve as a third winding. The effect is as follows: the structure tends to the flattening, and the volume reduces by a wide margin, and coupling mechanism not only possesses omnidirectional power output simultaneously, and current coupling mechanism of the same type promotes in the performance moreover to some extent, and coupling mechanism's mutual inductance is higher, and anti deflection performance and anti skew performance are stronger.

Description

Omnidirectional wireless electric energy receiving coil and wireless charging system for electric automobile
Technical Field
The invention relates to a wireless power transmission technology, in particular to an omnidirectional wireless power receiving coil and a wireless charging system of an electric vehicle.
Background
Wireless Power Transfer (WPT) realizes non-electrical contact transmission of electric energy through media such as magnetic fields, electric fields, lasers, microwaves and the like. The technology can effectively solve the problems of limited flexibility and potential safety hazard of equipment caused by the traditional wired power taking mode. At present, in the application fields of electric vehicles, consumer electronics products, household appliances and the like, expert and scholars at home and abroad research the technology and obtain more theoretical achievements.
The transmitting coil and the receiving coil of a general magnetic coupling WPT system coupling mechanism have certain directivity, and when the receiving coil rotates randomly, an energy receiving dead zone exists, so that induced voltage cannot be generated, and for some electric equipment with uncertain space postures or random changes, the stability of energy transmission is extremely poor, the efficiency is reduced, and technical improvement is urgently needed.
In the prior art, a chinese patent 201410304686.3 discloses a multiple degree of freedom electric energy pickup mechanism of a wireless electric energy transmission system, which realizes the multiple degree of freedom pickup of energy in the wireless electric energy transmission system by changing the coil distribution form and the winding manner of the pickup mechanism; in addition, chinese patent 201810168201.0 also discloses a WPT system based on a three-dimensional dipole coil and a parameter design method thereof, and under the condition that the pickup mechanism rotates arbitrarily, the output power and efficiency are relatively stable, and energy output with power of 20W and efficiency of 70% is realized.
Although the prior art can realize wireless power reception with multiple degrees of freedom and even in all directions, the coupling mechanisms of the prior art are designed in a three-dimensional structure, and the space occupied by the receiving coil is still large.
Disclosure of Invention
In view of the above, the present invention first provides an omnidirectional wireless power receiving coil, which can save a three-dimensional space required by a coupling mechanism by using a flat structural design, and improve a transmission distance, a transmission power, a transmission efficiency, and a transmission stability of the coupling mechanism on the premise of ensuring omnidirectional energy transmission.
In order to achieve the purpose, the invention adopts the following specific technical scheme:
the utility model provides an omnidirectional wireless power receiving coil, its key lies in, includes "mouth" font magnetic core the magnetic core structure on four limits of "mouth" font magnetic core is gone up the winding respectively and is had helical coil, wherein: the two spiral coils which are opposite up and down are wound in opposite directions and are mutually connected in series to serve as a first winding, the two spiral coils which are opposite to left and right are wound in opposite directions and are mutually connected in series to serve as a second winding, and planar coils are also densely wound along the periphery of the square magnetic core to serve as a third winding.
Optionally, the height of the third winding is flush with the height of the "square" shaped magnetic core.
Optionally, the outer contour of the square magnetic core is square, and a square hollow area is reserved in the middle of the square magnetic core.
Optionally, the width of each side of the "square" shaped core is the same, and the number of turns of the spiral coil wound on each side is the same.
Optionally, the square magnetic core is horizontally arranged, and a shielding plate is arranged above the square magnetic core.
Optionally, the first winding, the second winding and the third winding are respectively connected with a compensation capacitor and a rectification filter circuit.
Optionally, the output ends of the three rectifying and filtering circuits are connected in parallel to supply power to the load.
Optionally, the output ends of the three rectifying and filtering circuits are connected in series to supply power to the load.
Based on the omnidirectional wireless power receiving coil, the invention also provides a wireless charging system for the electric vehicle, which is characterized in that: the omnidirectional wireless power receiving coil is adopted on the electric automobile.
Optionally, in the wireless charging system for the electric vehicle, the transmitting coil of the transmitting terminal is a square plane close-wound coil.
The invention has the following effects:
the omnidirectional wireless power receiving coil and the wireless charging system for the electric automobile, which are provided by the invention, tend to be flattened in structure and greatly reduced in volume, meanwhile, the coupling mechanism not only has omnidirectional power output, but also is improved in performance compared with the existing coupling mechanism of the same type, the mutual inductance of the coupling mechanism is higher, and the deflection resistance and the offset resistance are stronger.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below.
Fig. 1 is a schematic view of an omnidirectional wireless power receiving coil according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a "square" shaped magnetic core in an embodiment of the present invention;
FIG. 3 is a diagram of a model of a coupling mechanism of a wireless charging system of an electric vehicle according to an embodiment;
FIG. 4 is a schematic circuit diagram of an electric vehicle wireless charging system according to an embodiment;
FIG. 5 is a schematic diagram of a cross-shaped magnetic core coupling mechanism in a comparative experiment;
FIG. 6 is a schematic structural diagram of a single receiver coil coupling mechanism in a comparative experiment;
FIG. 7 is a graph of equivalent mutual inductance versus rotation angle for three coupling mechanisms;
FIG. 8 is a plot of equivalent mutual inductance versus translation distance in the X direction for three coupling mechanisms.
Reference numerals: 1- 'square' shaped magnetic core, 2-first winding, 3-second winding, 4-third winding and 5-shielding plate.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
As shown in fig. 1, the present embodiment provides an omnidirectional wireless power receiving coil, which includes a "square" shaped magnetic core 1, wherein spiral coils are respectively wound on magnetic core structures of four sides of the "square" shaped magnetic core 1, wherein: the winding directions of two spiral coils which are opposite from top to bottom are opposite and are mutually connected in series to form a first winding 2, the winding directions of two spiral coils which are opposite from left to right are opposite and are mutually connected in series to form a second winding 3, planar coils are densely wound along the periphery of the square magnetic core 1 to form a third winding 4, the square magnetic core 1 is horizontally arranged, and a shielding plate 5 is arranged above the square magnetic core 1.
In specific implementation, the most widely used PC40 in the manganese-zinc ferrite is selected as the magnetic core material of the coupling receiving mechanism, and as can be seen from the figure 2, the outline of the square magnetic core is square, a square hollow area is reserved in the middle, and d1And d2The length of two squares representing the sides of the magnetic core is respectively called as the outer side length and the inner side length, the central points of the two squares are the same, one half of the difference between the inner side length and the outer side length is used as the effective width of the magnetic core, the width is short, the width of four sides is equal, in order to realize symmetrical design, the number of turns of the spiral coil wound on each side is also the same, and in order to not increase the thickness of the receiving mechanism, the height of the third winding is flush with the height of the square magnetic core.
According to a specific application scene, the first winding, the second winding and the third winding are respectively connected with a compensation capacitor and a rectifying and filtering circuit, and the output ends of the three rectifying and filtering circuits can be connected in parallel to supply power for a load or can be connected in series to supply power for the load.
For the mode of series connection after coil rectification, because the coil line passes through the rectifier circuit, consequently need not to consider the positive and negative direction of every group coil induced electromotive force, does not have the problem of voltage cancellation, total output voltage:
Uout＝|Us1|+|Us2|+|Us3|
the induced electromotive force of each group of coils has a gain effect on the output voltage, and the equivalent mutual inductance M of the coupling mechanism at the momenteqThe mutual inductance of the receiving coils is just the sum of absolute values, but in the method, because the current needs to pass through three rectifier bridges, a more obvious rectifying voltage drop is generated in a practical low-power circuit, and the output voltage is slightly reduced.
For the parallel connection mode after the coils are rectified, due to the action of the rectifier bridge, the output voltages between the coils cannot influence each other, and the output voltage given to the load is the largest one of the induced electromotive forces in the three groups of coils, namely:
Uout＝max{Us1，Us2，Us3}
meanwhile, because the current only flows through one rectifier bridge and one coil each time, the rectification voltage drop and the coil loss are small, but the method has the defects that only one coil can be used as output at the same moment, the other two coils are idle, and the mode that the output power is connected in series with the rectified coil is relatively small.
Based on the above omnidirectional wireless power receiving coil, this embodiment further provides a wireless charging system for electric vehicle, and it can be seen from fig. 3 and fig. 4 that the omnidirectional wireless power receiving coil is adopted on the electric vehicle, and the transmitting coil of the transmitting terminal adopts a square plane tightly-wound coil, and in fig. 4, the transmitting terminal is further provided with a dc power supply UdcFull-bridge inverter circuit composed of Q1-Q4 and primary side resonant capacitor CpWherein the primary side resonant capacitor CpAnd a transmitting coil LpForm a series resonant circuit, IdcFor input of current, Ls1、Ls2、Ls3Corresponding to an energy-receiving coil of three windings, Rs1、Rs2、Rs3Corresponding to the internal resistance, I, of each receiving coils1、Is2、Is3For three receiving coil currents, bridge1, bridge2 and Bridge3 are three rectifier bridges, UoutAnd IoutRespectively the output voltage and the output current after the parallel connection of the rectifier bridges, CfIs a DC filter capacitor, RLIs a load resistor.
As the first winding and the second winding are vertically distributed, the mutual inductance between the first winding and the second winding is zero through simulation verification, and the first winding and the second winding are respectively formed by connecting two symmetrically-arranged reverse coils in series, the mutual inductance is also almost zero aiming at the third winding, so that the effective mutual inductance between 4 coils in the system only considers M shown in figure 41、M2、M3I.e. the mutual inductance between the transmitter coil and the three windings.
In order to further verify the effect of the present invention, simulation analysis is performed through a design comparison experiment, and in the comparison process, the cross-shaped coupling mechanism shown in fig. 5 and the single-receiving coil coupling mechanism shown in fig. 6 are compared with the D-shaped coupling mechanism formed by the omnidirectional wireless power receiving coil shown in fig. 3 provided by the present invention.
The emitting mechanisms of the simulation models of the three coupling mechanisms are completely the same, the outer side length of an emitting coil is 15cm, the inner side length of the emitting coil is 10cm, namely the width of a winding is 2.5cm, the thickness of the winding is 2mm, and the number of turns is set to be 20. The sizes of the outermost receiving coils of the D-shaped magnetic core coupling mechanism and the cross-shaped magnetic core coupling mechanism are the same as those of the receiving coils of the single-receiving coil coupling mechanism, the outer side length is 8cm, the inner side length is 6.2cm, the number of turns of the outermost receiving coils of the two previous coupling mechanisms is 10, and the number of turns of the receiving coils of the single-receiving coil coupling mechanism is 11. The number of turns of the other two groups of receiving coils of the D-shaped magnetic core coupling mechanism and the cross-shaped magnetic core coupling mechanism is the same, and the number of turns of the other two groups of receiving coils is 16. The length of the outer side of the D-shaped magnetic core is 6cm, the length of the inner side of the D-shaped magnetic core is 3cm, and the width of the D-shaped magnetic core is 1.5cm. The cross-shaped magnetic core is also a symmetrical structure, and the plane areas of the two magnetic cores are equal, so when the thicknesses of the two magnetic cores are the same, the volumes are also equal, and the thickness is set to be 5mm.
In simulation, the output mode of the coupling mechanism is that three receiving coils are rectified and then output in series, and the equivalent mutual inductance M of the three receiving coils iseqIs the sum of the mutual inductances between each receiver coil and the transmitter coil. For a cross-shaped core coupling mechanism that is also a three-coil structure,the equivalent mutual inductance of the coupling mechanism is the same as the calculation method of the mutual inductance of the D-shaped magnetic core coupling mechanism designed by the invention, and the equivalent mutual inductance of the coupling mechanism of the single receiving coil directly takes the absolute value of the mutual inductance of the transmitting coil and the receiving coil. The current of the transmitting coil of the simulation model is 2A, the frequency is 150kHz, and the receiving mechanism is located 5cm right above the transmitting coil.
Firstly, the receiving mechanisms of the three coupling mechanisms are subjected to rotation simulation, the receiving mechanisms rotate around the X axis at fixed points, and the relationship curve of equivalent mutual inductance and rotation angle is shown in FIG. 7. Since all three coupling mechanisms are symmetrical, the result is the same when the receiving mechanism is rotated about the X-axis and rotated about the Y-axis. As can be seen from fig. 7, no matter what rotation angle the receiving mechanism is at, the equivalent inductance of the D-shaped magnetic core coupling mechanism and the cross-shaped magnetic core coupling mechanism is always not zero, while the equivalent inductance of the single-receiving coil coupling mechanism fluctuates greatly during rotation and drops to zero at rotation angles of 90 ° and 270 °, thereby verifying that the D-shaped magnetic core coupling mechanism and the cross-shaped magnetic core coupling mechanism can transmit electric energy in all directions wirelessly, while the single-receiving coil coupling mechanism does not have such performance. Meanwhile, when the D-shaped magnetic core coupling mechanism is at the same rotation angle, the equivalent mutual inductance of the D-shaped magnetic core coupling mechanism is always larger than that of the cross-shaped magnetic core coupling mechanism, and the D-shaped magnetic core coupling mechanism provided by the invention has better deflection resistance.
In addition, since the three coupling mechanisms are symmetrical about the X axis and the Y axis, the simulation result is the same when the receiving mechanism is translated to the negative direction of the X axis and the positive and negative directions of the Y axis. As can be seen from fig. 8, in the process of the translation of the receiving mechanism, there is a process that the equivalent mutual inductance value of the coupling mechanism with the omnidirectional power wireless transmission capability rises first and then falls, and the equivalent mutual inductance of the single-receiving coil coupling mechanism directly falls and the attenuation speed is faster, which indicates that the omnidirectional coupling mechanism enhances the anti-offset performance of the system, and can increase the effective charging area of the wireless power transmission system. Although the variation trend of the equivalent mutual inductance of the D-shaped magnetic core coupling mechanism is consistent with that of the cross-shaped magnetic core coupling mechanism, the equivalent mutual inductance of the D-shaped magnetic core coupling mechanism is always larger than that of the cross-shaped magnetic core coupling mechanism, and the anti-offset performance of the D-shaped magnetic core coupling mechanism is better.
As can be seen from the analysis results of fig. 7 and 8, the D-core coupling mechanism not only can realize omnidirectional wireless power transmission, but also has higher equivalent mutual inductance than the cross-core receiving mechanism in both translation and rotation when the number of turns of each receiving coil is the same and the transmission conditions are the same in a certain spatial range. In addition, when the number of turns of the receiving coil is the same, the winding section of the two groups of coils of the D-shaped magnetic core receiving mechanism is smaller than that of the cross-shaped magnetic core receiving mechanism, and is only half of that, so that the coil uses less wire. Therefore, the coupling mechanism designed in the invention can be considered to output power in all directions, and has better performance in all aspects than the existing cross-shaped magnetic core coupling mechanism. Therefore, the omnidirectional wireless power receiving coil provided by the invention forms a coupling mechanism, can be well used in an electric vehicle wireless charging system, and solves the problem of power reduction caused by electric vehicle charging position offset.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and such changes and modifications are intended to be included within the scope of the appended claims and the description.

Claims (10)

1. The utility model provides an omnidirectional wireless power receiving coil, its characterized in that, includes "mouthful" font magnetic core the magnetic core structure on four limits of "mouthful" font magnetic core has wound respectively helical coil, wherein: the two spiral coils which are opposite up and down are wound in opposite directions and are mutually connected in series to serve as a first winding, the two spiral coils which are opposite left and right are wound in opposite directions and are mutually connected in series to serve as a second winding, and planar coils are densely wound along the periphery of the square magnetic core to serve as a third winding.
2. An omnidirectional wireless power receiving coil as defined in claim 1, wherein a height of said third winding is substantially flush with a height of said "torx" shaped core.
3. An omnidirectional wireless power receiving coil according to claim 1 or 2, wherein the outline of the square-shaped magnetic core is square, and a square hollow area is reserved in the middle.
4. An omnidirectional wireless power receiving coil as defined in claim 3, wherein the width of each side of said "square" shaped magnetic core is the same, and the number of turns of the spiral coil wound on each side is the same.
5. An omnidirectional wireless power receiving coil according to claim 3, wherein the "k" -shaped magnetic core is horizontally arranged, and a shielding plate is disposed above the "k" -shaped magnetic core.
6. An omnidirectional wireless power receiving coil as defined in claim 3, wherein the first winding, the second winding and the third winding are respectively connected to a compensation capacitor and a rectifying and filtering circuit.
7. An omnidirectional wireless power receiving coil as defined in claim 6, wherein the output terminals of the three rectifying-filtering circuits are connected in parallel to supply power to the load.
8. An omnidirectional wireless power receiving coil as defined in claim 6, wherein the output terminals of the three rectifying-filtering circuits are connected in series to supply power to the load.
9. The utility model provides a wireless charging system of electric automobile which characterized in that: use of an omnidirectional wireless power receiving coil as defined in any one of claims 1 to 8 in an electric vehicle.
10. The wireless charging system of electric vehicle of claim 9, characterized in that: the transmitting coil of the transmitting end adopts a square plane close-wound coil.
CN202210840895.4A 2022-07-18 2022-07-18 Omnidirectional wireless electric energy receiving coil and wireless charging system of electric automobile Active CN115276248B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110635580A (en) * 2019-11-13 2019-12-31 西安工程大学 Multi-degree-of-freedom wireless power transmission device and preparation method thereof
CN113300486A (en) * 2021-05-26 2021-08-24 重庆大学 Annular dipole combined type transmitting mechanism, coupling mechanism and omnidirectional WPT system
CN113733942A (en) * 2021-08-12 2021-12-03 重庆理工大学 Wireless power supply coupling mechanism based on orthogonal DD (direct digital) coil and parameter design method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110635580A (en) * 2019-11-13 2019-12-31 西安工程大学 Multi-degree-of-freedom wireless power transmission device and preparation method thereof
CN113300486A (en) * 2021-05-26 2021-08-24 重庆大学 Annular dipole combined type transmitting mechanism, coupling mechanism and omnidirectional WPT system
CN113733942A (en) * 2021-08-12 2021-12-03 重庆理工大学 Wireless power supply coupling mechanism based on orthogonal DD (direct digital) coil and parameter design method thereof

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