CN113629893A - Wireless charging coupling mechanism, wireless power transmission system and method - Google Patents

Wireless charging coupling mechanism, wireless power transmission system and method Download PDF

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Publication number
CN113629893A
CN113629893A CN202110856139.6A CN202110856139A CN113629893A CN 113629893 A CN113629893 A CN 113629893A CN 202110856139 A CN202110856139 A CN 202110856139A CN 113629893 A CN113629893 A CN 113629893A
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China
Prior art keywords
coil
energy
coil group
switch
energy receiving
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Granted
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CN202110856139.6A
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Chinese (zh)
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CN113629893B (en
Inventor
吴晓锐
肖静
韩帅
尹立群
龚文兰
吴宁
陈绍南
陈卫东
卢健斌
阮诗雅
郭敏
郭小璇
孙乐平
赵立夏
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Electric Power Research Institute of Guangxi Power Grid Co Ltd
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Electric Power Research Institute of Guangxi Power Grid Co Ltd
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Priority to CN202110856139.6A priority Critical patent/CN113629893B/en
Publication of CN113629893A publication Critical patent/CN113629893A/en
Priority to PCT/CN2022/103940 priority patent/WO2023005625A1/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
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • 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
    • 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
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from 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
    • Y02T10/70—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

Abstract

The invention belongs to the technical field of wireless power transmission, and particularly relates to a wireless charging coupling mechanism, a wireless power transmission system and a wireless power transmission method. The wireless charging coupling mechanism comprises an energy transmitting device and an energy receiving device; the energy transmitting device comprises an energy transmitting coil; the energy receiving device comprises an energy receiving coil; the energy transmitting coil comprises a first coil group and a second coil group; the first coil group and the second coil group are the same in shape; the first coil group generates a magnetic field in the X-axis direction, and the second coil group generates a magnetic field in the Y-axis direction; according to the invention, two groups of coils generate horizontal magnetic fields with two dimensions along the X-axis direction and the Y-axis direction, no matter the energy receiving coil is arranged along the X-axis direction or the Y-axis direction, the energy transmitting coil can realize wireless electric energy transmission, one degree of freedom is expanded compared with the traditional single double-D type coil, and multi-degree-of-freedom wireless charging is realized for the energy receiving end.

Description

Wireless charging coupling mechanism, wireless power transmission system and method
Technical Field
The invention belongs to the technical field of wireless power transmission, and particularly relates to a wireless charging coupling mechanism, a wireless power transmission system and a wireless power transmission method.
Background
The intelligent robot inspection has the advantages of good autonomy, high inspection quality and the like, the intelligent level of inspection is greatly improved, and the robot inspection mode replaces the traditional manual inspection mode and becomes a development trend. Most of the current power supply modes of the inspection robots are based on wired charging or manual power changing modes, and the problems of poor flexibility, low reliability, low intelligent level and the like exist. The wireless charging technology provides an idea for solving the problems existing in the contact power supply or manual power changing mode, and has the advantages of flexibility, reliability, safety and the like because the wireless charging technology is free from the constraint of physical media, so that the wireless charging technology is more and more widely applied to the field of intelligent inspection of robots.
At present, a solenoid-type coil is mostly adopted at a receiving end of a robot wireless charging system to be horizontally placed at the bottom of a robot body, and a horizontal direction transmitting magnetic field generated by a single double-D-type transmitting coil is matched, referring to fig. 1, in fig. 1, the solenoid-type coil and the single double-D-type transmitting coil are mutually coupled. However, a single double-D type transmitting coil only generates a magnetic field in a horizontal direction, and the solenoid type receiving coil needs to be parallel to the transmitting magnetic field to be well coupled with the magnetic field to receive energy, so that the requirement on the stop precision of a receiving end is high, and the degree of freedom of wireless charging is low.
Disclosure of Invention
In order to solve the above problems, the present invention provides a wireless charging coupling mechanism, a wireless power transmission system and a wireless power transmission method, and the specific technical scheme is as follows:
a wireless charging coupling mechanism comprises an energy transmitting device and an energy receiving device;
the energy emitting device comprises an energy emitting coil; the energy receiving device comprises an energy receiving coil;
the energy transmitting coil comprises a first coil group and a second coil group; the first coil group and the second coil group respectively comprise two coils which are mutually in an axisymmetrical pattern; the symmetry axis of the first coil group is a Y axis, and the symmetry axis of the second coil group is an X axis; the first coil group and the second coil group are the same in shape;
the first coil group generates a magnetic field in an X horizontal direction, and the second coil group generates a magnetic field in a Y horizontal direction;
when the energy receiving coil is placed along the X-axis direction, the energy receiving coil is coupled with the first coil group; when the energy receiving coil is placed along the Y-axis direction, the energy receiving coil and the second coil group are coupled with each other.
Preferably, the first coil group and the second coil group respectively comprise two isosceles trapezoid coils which are axisymmetrical with each other; the four isosceles trapezoid coils are positioned on the same plane, and the upper bottom edges of the four isosceles trapezoid coils are close to the origin of coordinates.
Preferably, the parameters of the four isosceles trapezoid coils are consistent.
Preferably, the energy transmitting coil comprises a transmitting end compensation coil;
the upper bottom edges of the four isosceles trapezoid coils are close to the original point and are in end connection with each other to form a square area in which no coil is wound;
the transmitting end compensation coil is arranged in the square area.
Preferably, the energy emission device further comprises a magnetic core and a magnetic shielding device, the magnetic core and the magnetic shielding device are both in a planar square structure, and the magnetic core is arranged between the magnetic shielding device and the energy emission coil.
A wireless power transmission system includes
A primary side electric energy transmitting circuit and a secondary side electric energy receiving circuit;
the primary side electric energy transmitting circuit comprises a direct current power supply, a full-bridge inverter circuit, a primary side resonance compensation network and the energy transmitting coil of the wireless charging coupling mechanism which are sequentially connected;
the secondary side power receiving circuit comprises the energy receiving coil, a secondary side resonance compensation network, a rectification filter circuit and a load of the wireless charging coupling mechanism according to any one of claims 1 to 5 which are connected in sequence;
the energy receiving coil is a solenoid-type coil;
the primary side electric energy transmitting circuit further comprises a first switch and a second switch, the first switch and the second switch are respectively connected with the first coil group and the second coil group, and the first switch and the second switch are respectively used for controlling the opening and closing of the first coil group and the opening and closing of the second coil group;
when the energy receiving coil is placed along the X-axis direction, the first switch is turned on, the second switch is turned off, and the energy receiving coil and the first coil group are coupled with each other; when the energy receiving coil is placed along the Y-axis direction, the first switch is turned off, the second switch is turned on, and the energy receiving coil and the second coil group are coupled with each other.
Preferably, the drive signals of the first switch and the second switch are inverted.
Preferably, the first switch and the second switch comprise MOSFET transistors.
A wireless power transmission method is applied to the wireless power transmission system and comprises the following steps:
s1: when the energy receiving coil enters a charging area, the first switch is turned on, the second switch is turned off, and a first output voltage U is obtainedo1；
S2: the first output voltage U is converted into the second output voltage Uo1And a predetermined voltage threshold UsetComparing; if the first output voltage U iso1Greater than or equal to the preset voltage threshold UsetWirelessly transmitting energy to the energy receiving coil through the first coil group;
if the first output voltage U iso1Less than the preset voltage threshold UsetIf so, the first switch is closed, the second switch is opened, and a second output voltage U is obtainedo2；
S3: the second output voltage Uo2And the preset voltage threshold value UsetComparing;
if the second output voltage U iso2Greater than or equal to the preset voltage threshold UsetWirelessly transmitting energy to the energy receiving coil through the second coil group;
if the second output voltage U iso2Less than the preset voltage threshold UsetAnd then informing the secondary side electric energy receiving end to adjust the placing angle.
The invention has the beneficial effects that: according to the invention, two groups of coils generate horizontal magnetic fields with two dimensions along the X-axis direction and the Y-axis direction, no matter the energy receiving coil is arranged along the X-axis direction or the Y-axis direction, the energy transmitting coil can realize wireless electric energy transmission, one degree of freedom is expanded compared with the traditional single double-D type coil, and multi-degree-of-freedom wireless charging is realized for the energy receiving end.
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. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 is a schematic diagram of a solenoid-type coil and a single dual-D-type transmitting coil coupled with each other according to the prior art;
fig. 2 is a schematic diagram of a solenoid-type coil according to the first and second embodiments, which is disposed along the X horizontal direction and is coupled to a pair of dual D-type coils along the X horizontal direction;
fig. 3 is a schematic diagram of a solenoid-type coil according to the first and second embodiments, which is disposed along the Y horizontal direction and is coupled to a pair of dual D-type coils along the Y horizontal direction;
fig. 4 is a schematic view of an energy transmission device according to the first embodiment and the second embodiment;
fig. 5 is a schematic diagram of a wireless power transmission system according to the second embodiment;
the coil comprises a solenoid coil 11, a first coil group 12, a second coil group 13, a transmitting end compensation coil 14 and a magnetic core 15.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
The first embodiment is as follows:
in order to solve the problems that in the prior art, a single double-D type transmitting coil only generates a magnetic field in a horizontal direction, the parking precision requirement on a receiving end is high, and the wireless charging freedom degree is low, the embodiment provides a wireless charging coupling mechanism which can be applied to wireless charging scenes of robots, automobiles, unmanned aerial vehicles and the like, and referring to fig. 2 to 4, the wireless charging coupling mechanism comprises an energy transmitting device and an energy receiving device;
the energy transmitting device comprises an energy transmitting coil; the energy receiving device comprises an energy receiving coil;
the energy transmitting coil comprises a first coil group 12 and a second coil group 13; the first coil group 12 and the second coil group 13 respectively comprise two coils which are mutually in an axisymmetrical pattern; the symmetry axis of the first coil assembly 12 is the Y axis, and the symmetry axis of the second coil assembly 13 is the X axis; the first coil group 12 and the second coil group 13 have the same shape;
the first coil group 12 generates a magnetic field in the X horizontal direction, and the second coil group 13 generates a magnetic field in the Y horizontal direction;
when the energy receiving coil is placed along the X-axis direction, the energy receiving coil is coupled with the first coil group 12; when the energy receiving coil is placed in the Y-axis direction, the energy receiving coil is coupled to the second coil group 13.
As shown in fig. 2, when the energy receiving coil is placed along the X-axis direction, the energy receiving coil is coupled with the first coil group 12, and as can also be seen from fig. 2, when the energy receiving coil is placed along the X-axis direction, the first coil group 12 has a magnetic field, and the second coil group 13 has no magnetic field.
As shown in fig. 3, when the energy-receiving coil is placed in the Y-axis direction, the energy-receiving coil is coupled to the second coil set 1313, and as can also be seen from fig. 3, when the energy-receiving coil is placed in the Y-axis direction, the second coil set 13 has a magnetic field, while the first coil set 12 has no magnetic field.
The energy transmitting coil formed by the first coil group 12 and the second coil group 13 can generate a horizontal magnetic field with two dimensions in the X horizontal direction and the Y horizontal direction, no matter the energy receiving coil is placed in the X axis direction or the Y axis direction, the energy transmitting coil can realize wireless electric energy transmission, one degree of freedom is expanded compared with a traditional single double-D type coil, and multi-degree-of-freedom wireless charging is realized for an energy receiving end. For example, the solenoid type coil 11 is horizontally arranged at the bottom of the robot body, and the robot can realize wireless charging no matter placed along the X-axis direction or placed along the Y-axis direction.
As shown in fig. 4, the first coil group 12 and the second coil group 13 respectively include two isosceles trapezoid coils that are axisymmetrical to each other; the four isosceles trapezoid coils are positioned on the same plane, and the upper bottom edges of the four isosceles trapezoid coils are close to the origin of coordinates. The parameters of the four isosceles trapezoid coils are consistent, and the parameters comprise the number of winding turns, the diameter of the winding wire and the like.
As shown in fig. 4, the energy transmission coil includes a transmission-end compensation coil 14; the upper bottom edges of the four isosceles trapezoid coils are close to the original point and are connected end to form a closed square area in which the coil is not wound; the transmitting-side compensation coil 14 is disposed in a square area. The transmitting end compensation coil 14 is a Q-shaped coil, and the transmitting end compensation coil 14 is arranged at the center of the energy transmitting coil, so that the volume of the energy transmitting device is reduced. The transmitting end compensation coil 14 and the energy transmitting coil are decoupled from each other, so that the problems of mutual crosstalk, electromagnetic interference and the like do not exist, and the compensation network can be ensured to have a constant voltage output function.
As shown in fig. 4, the energy emission device further includes a magnetic core 15 and a magnetic shielding member, both the magnetic core 15 and the magnetic shielding member are of a planar square structure, and the magnetic core 15 is disposed between the magnetic shielding member and the energy emission coil. The transmitting end compensation coil 14 and the energy transmitting coil share the magnetic core 15 and the magnetic shielding device, so that the volume and the weight of the energy transmitting device are reduced, and the cost is saved. The magnetic shield device includes an aluminum plate or a copper plate.
Example two:
in order to solve the problems that in the prior art, a single double-D type transmitting coil only generates a magnetic field in a horizontal direction, the requirement on the stop precision of a receiving end is high, and the degree of freedom of wireless charging is low, the embodiment provides a wireless power transmission system, which comprises a primary side power transmitting circuit and a secondary side power receiving circuit;
the primary side electric energy transmitting circuit comprises a direct current power supply (E in figure 5) and a full-bridge inverter circuit (a switching tube Q in figure 5) which are connected in sequence1、Q2、Q3、Q4) Primary side resonance compensation network (transmitting end compensation coil L in figure 5)tA first compensation capacitor CtA second compensation capacitor Cp) And an energy transmitting coil (L in fig. 5) of the wireless charging coupling mechanism according to any one of the embodimentsp1And Lp2) (ii) a In FIG. 5, the equivalent internal resistance R is also includedP1、RP2Rs; switch tube Q1And Q2The drain electrodes (D electrodes) are connected with the positive electrode of a direct current power supply, Q1、Q2Respectively with Q3、Q4Is connected with the drain electrode (D pole) and is respectively connected with two ends of the primary side resonance compensation network, Q3、Q4The source (S pole) of the capacitor is connected with the negative pole of the direct current power supply. The grid electrodes (G poles) of the four switching tubes can be respectively connected with a square wave driving signal of 100kHz to carry out constant voltage output. M1Is Lp1And LsMutual inductance of (M)2Is Lp2And LsMutual inductance of (3).
The secondary power receiving circuit includes an energy receiving coil (L in fig. 5) of the wireless charging coupling mechanism according to any one of the embodiments connected in seriess) Secondary side resonance compensation network (C in fig. 5)s) Rectifier filter circuit (four diodes in figure 5) and a capacitor (connected in parallel with load R)LTwo ends)]And a load (R in FIG. 5)L）。
The energy transmitting coil comprises a first coil group 12 and a second coil group 13; the first coil group 12 and the second coil group 13 respectively comprise two coils which are mutually in an axisymmetrical pattern; the symmetry axis of the first coil assembly 12 is the Y axis, and the symmetry axis of the second coil assembly 13 is the X axis; the first coil group 12 and the second coil group 13 have the same shape;
the first coil group 12 generates a magnetic field in the X horizontal direction, and the second coil group 13 generates a magnetic field in the Y horizontal direction;
when the energy receiving coil is placed along the X-axis direction, the energy receiving coil is coupled with the first coil group 12; when the energy receiving coil is placed in the Y-axis direction, the energy receiving coil is coupled to the second coil group 13.
The energy receiving coil is a solenoid-type coil 11;
the primary power transmission circuit further includes a first switch (Q in FIG. 5)5、Q6) And a second switch (Q in FIG. 5)7、Q8) The first switch and the second switch are respectively connected with the first coil group 12 and the second coil group 13, and are respectively used for controlling the opening and closing of the first coil group 12 and the opening and closing of the second coil group 13;
when the energy receiving coil is placed along the X-axis direction, the first switch is turned on, the second switch is turned off, and the energy receiving coil is coupled with the first coil group 12; when the energy receiving coil is placed along the Y-axis direction, the first switch is turned off, the second switch is turned on, and the energy receiving coil and the second coil group 13 are coupled to each other.
The drive signals of the first and second switches being in antiphase, i.e. Q5、Q6Drive signal of and Q7、Q8To ensure that only one set of the double D coils is excited. Such as a robot bodyWhen the solenoid-type coil 11 is placed along the X-axis direction, Q is set5、Q6Are all on, Q7、Q8The first coil group 12 is turned off to work and wirelessly charge the robot, and the second coil group 13 does not work; when the solenoid type coil 11 on the robot body is placed along the Y-axis direction, Q5、Q6Are all turned off, Q7、Q8All open, realize second coil assembly 13 work, wirelessly charge the robot, and first coil assembly 12 is out of work. The first and second switches comprising MOSFET transistors, i.e. switch Q5、Q6 、Q7、Q8Are all MOSFET tubes.
The two groups of double-D type energy transmitting coils can generate horizontal magnetic fields with two dimensionalities in the X-axis direction and the Y-axis direction, no matter the energy receiving coils are placed in the X-axis direction or the Y-axis direction, the energy transmitting coils can achieve wireless electric energy transmission, one degree of freedom is expanded compared with a traditional single double-D type coil, and multi-degree-of-freedom wireless charging is achieved for an energy receiving end. For example, the solenoid type coil 11 is horizontally arranged at the bottom of the robot body, and the robot can realize wireless charging no matter placed along the X-axis direction or placed along the Y-axis direction.
As shown in fig. 5, a wireless power transmission method is applied to a wireless power transmission system, and the wireless power transmission method of this embodiment is to perform coupling degree detection based on a secondary dc output voltage when the wireless power transmission system starts to charge, and select a group of dual D-type energy transmitting coils meeting the coupling degree requirement for charging, and specifically includes the following steps:
the method comprises the following steps:
s1, enabling a secondary side electric energy receiving end (an energy receiving coil is arranged on the secondary side electric energy receiving end) to enter a charging area to request charging;
s2, the primary power module is in standby, and the primary side and the secondary side establish communication;
s3, switching the first switch (Q)5、Q6) Open, second switch (Q)7、Q8) Is turned off and supplied to Q1-Q4A drive signal of a minimum duty cycle;
S4、obtain a first output voltage Uo1The first output voltage U is converted into the second output voltage Uo1And a predetermined voltage threshold UsetComparing; first output voltage Uo1The voltage of two ends of a load in the secondary side electric energy receiving circuit is received when the first switch is turned on and the second switch is turned off;
s5, if the first output voltage Uo1Greater than or equal to a preset voltage threshold value UsetThen, wireless energy transmission is carried out to the energy receiving coil through the first coil group 12;
s6, if the first output voltage Uo1Less than a predetermined voltage threshold UsetThen the first switch is closed and the second switch is opened to supply Q1-Q4Obtaining a second output voltage U from the driving signal with the minimum duty ratioo2Second output voltage Uo2And a predetermined voltage threshold UsetComparing; second output voltage Uo2When the first switch is closed and the second switch is opened, the voltage at two ends of the load in the secondary side electric energy receiving circuit is obtained;
s7, if the second output voltage Uo2Greater than or equal to a preset voltage threshold value UsetThen, the energy is wirelessly transmitted to the energy receiving coil through the second coil assembly 13.
S8, if the second output voltage Uo2Less than a predetermined voltage threshold UsetAnd if the charging fails, informing the secondary side electric energy receiving end to adjust the placing angle.
The present invention is not limited to the above embodiments, which are merely preferred embodiments of the present invention, and the present invention is not limited thereto, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. A wireless coupling mechanism that charges which characterized in that: comprises an energy transmitting device and an energy receiving device;
the energy emitting device comprises an energy emitting coil; the energy receiving device comprises an energy receiving coil;
the energy transmitting coil comprises a first coil group (12) and a second coil group (13); the first coil group (12) and the second coil group (13) respectively comprise two coils which are mutually in an axisymmetrical pattern; the symmetry axis of the first coil group (12) is a Y axis, and the symmetry axis of the second coil group (13) is an X axis; the first coil group (12) and the second coil group (13) are the same in shape;
the first coil group (12) generates a magnetic field in an X horizontal direction, and the second coil group (13) generates a magnetic field in a Y horizontal direction;
when the energy receiving coil is placed along the X-axis direction, the energy receiving coil is mutually coupled with the first coil group (12); when the energy receiving coil is placed along the Y-axis direction, the energy receiving coil is mutually coupled with the second coil group (13).
2. A wireless charging coupling mechanism according to claim 1, wherein: the first coil group (12) and the second coil group (13) respectively comprise two isosceles trapezoid coils which are axially symmetrical to each other; the four isosceles trapezoid coils are positioned on the same plane, and the upper bottom edges of the four isosceles trapezoid coils are close to the origin of coordinates.
3. A wireless charging coupling mechanism according to claim 2, wherein: the parameters of the four isosceles trapezoid coils are consistent.
4. A wireless charging coupling mechanism according to claim 2, wherein: the energy transmitting coil comprises a transmitting end compensation coil (14);
the upper bottom edges of the four isosceles trapezoid coils are close to the original point and are in end connection with each other to form a square area in which no coil is wound;
the transmitting end compensation coil (14) is arranged in the square area.
5. A wireless charging coupling mechanism according to claim 1, wherein: the energy transmitting device further comprises a magnetic core (15) and a magnetic shielding device, wherein the magnetic core and the magnetic shielding device are both of planar square structures, and the magnetic core (15) is arranged between the magnetic shielding device and the energy transmitting coil.
6. A wireless power transfer system, comprising: comprises that
A primary side electric energy transmitting circuit and a secondary side electric energy receiving circuit;
the primary side electric energy transmitting circuit comprises a direct current power supply, a full-bridge inverter circuit, a primary side resonance compensation network and the energy transmitting coil of the wireless charging coupling mechanism as claimed in any one of claims 1 to 5 which are connected in sequence;
the secondary side power receiving circuit comprises the energy receiving coil, a secondary side resonance compensation network, a rectification filter circuit and a load of the wireless charging coupling mechanism according to any one of claims 1 to 5 which are connected in sequence;
the energy receiving coil is a solenoid-type coil;
the primary side electric energy transmitting circuit further comprises a first switch and a second switch, the first switch and the second switch are respectively connected with the first coil group (12) and the second coil group (13), and the first switch and the second switch are respectively used for controlling the on-off of the first coil group (12) and the on-off of the second coil group (13);
when the energy receiving coil is placed along the X-axis direction, the first switch is turned on, the second switch is turned off, and the energy receiving coil is mutually coupled with the first coil group (12); when the energy receiving coil is placed along the Y-axis direction, the first switch is closed, the second switch is opened, and the energy receiving coil and the second coil group (13) are coupled with each other.
7. A wireless power transfer system according to claim 6, wherein: the driving signals of the first switch and the second switch are in opposite phase.
8. A wireless power transfer system according to claim 6, wherein: the first switch and the second switch comprise MOSFET transistors.
9. A wireless power transmission method is characterized in that: the wireless power transmission system according to any one of claims 6 to 8, comprising the steps of:
s1: when the energy receiving coil enters a charging area, the first switch is turned on, the second switch is turned off, and a first output voltage U is obtainedo1；
S2: the first output voltage U is converted into the second output voltage Uo1And a predetermined voltage threshold UsetComparing; if the first output voltage U iso1Greater than or equal to the preset voltage threshold UsetWirelessly transmitting energy to the energy receiving coil by the first coil group (12);
if the first output voltage U iso1Less than the preset voltage threshold UsetIf so, the first switch is closed, the second switch is opened, and a second output voltage U is obtainedo2；
S3: the second output voltage Uo2And the preset voltage threshold value UsetComparing;
if the second output voltage U iso2Greater than or equal to the preset voltage threshold UsetThen wirelessly transmitting energy to the energy receiving coil through the second coil group (13);
if the second output voltage U iso2Less than the preset voltage threshold UsetAnd then informing the secondary side electric energy receiving end to adjust the placing angle.
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