CN111092497B - Magnetic induction wireless power transmission coil and magnetic induction wireless power transmission system - Google Patents
Magnetic induction wireless power transmission coil and magnetic induction wireless power transmission system Download PDFInfo
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- CN111092497B CN111092497B CN202010002648.8A CN202010002648A CN111092497B CN 111092497 B CN111092497 B CN 111092497B CN 202010002648 A CN202010002648 A CN 202010002648A CN 111092497 B CN111092497 B CN 111092497B
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- coil
- magnetic induction
- wireless power
- induction wireless
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2871—Pancake coils
-
- 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
Abstract
The invention provides a magnetic induction wireless electric energy transmission coil and a magnetic induction wireless electric energy transmission system. The planes of the two planar spiral structures are parallel to each other, and the winding directions are opposite. The two planar spiral structures are respectively connected to two poles of a high-frequency alternating current power supply or a load. Compared with the traditional magnetic induction wireless energy transmission coil structure, the structure does not need an external compensation circuit, can be directly connected to an alternating current power supply at an energy transmitting end, and can be directly connected to an alternating current load or a rectifying circuit at an energy receiving end. The magnetic induction wireless electric energy transmission system formed by the coil structure has the advantages of simpler and more compact structure and higher reliability due to no compensation circuit, and has great engineering application prospect in the fields of wireless real-time energy supply and wireless charging.
Description
Technical Field
The invention relates to the field of wireless power transmission, in particular to a magnetic induction wireless power transmission coil and a magnetic induction wireless power transmission system.
Background
Magnetic induction wireless power transmission is a method for wireless power transmission by using an alternating magnetic field. Because the magnetic field does not act with the dielectric medium, the wireless power transmission adopting the magnetic induction principle is highly safe and reliable in a humid environment, a use environment with human activities around and inside the human body. It is therefore well suited for many applications, such as: contactless electric vehicle charging, implantable medical device powering, and various applications in underwater or hazardous environments.
The structure of a traditional magnetic induction wireless power transmission system comprises an alternating current power supply, a load, a power transmission coil and a compensation circuit thereof. An alternating current power supply drives the transmitter coil, generating an alternating magnetic field around it. According to the electromagnetic induction principle, the receiving coil induces an alternating electromotive force in a magnetic field, thereby transmitting alternating current electric energy to a load. Since the impedance of the coil is inductive, a large amount of reactive power is generated in the transmission system, and in order to obtain high power transmission efficiency, compensation circuits are required to be added between the alternating current power supply and the transmitting coil and between the receiving coil and the load so as to eliminate the reactive power. However, the compensation circuit increases circuit complexity and decreases system reliability. In addition, inevitably, the compensation circuit itself has some loss, thereby reducing the efficiency of the entire power transmission system. Therefore, there is a need for a magnetic induction wireless power transmission structure that can operate without a compensation circuit.
Disclosure of Invention
The invention aims to provide a magnetic induction wireless power transmission coil and a magnetic induction wireless power transmission system, wherein the impedance characteristic of the coil at the working frequency presents the characteristic that the reactance is 0, namely the impedance characteristic of the coil is consistent with that of a traditional coil connected with a compensating circuit. Therefore, the coil can be directly connected to an alternating current power supply or a load without adding an additional compensation circuit. The proposed coil is composed of two anti-symmetric planar spirals which are arranged in two parallel layers and are not electrically connected to each other. Two anti-symmetric planar spirals constitute the inductance of the coil and due to the electrical isolation between the two, an equivalent parasitic capacitance is formed. The working frequency of the novel coil structure provided by the invention is the resonant frequency of the inductor and the capacitor. Increasing the number of turns of the coil will increase the self-inductance of the coil, and therefore the operating frequency of the coil will decrease; reducing the distance between the two anti-symmetric planar spirals increases the equivalent parasitic capacitance of the coil and therefore the operating frequency of the coil is reduced.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a magnetic induction wireless power transfer coil comprising two anti-symmetric helical coils and leads thereof;
the two anti-symmetric spiral coils are mutually and electrically isolated and are in different planes;
the two anti-symmetric spiral coils are provided with two end points, wherein the outer end point or the inner end point is connected with the lead wire, and the other end point is left empty.
In the magnetic induction wireless electric energy transmission coil provided by the invention, as an option, a plane spiral line forming the coil is an Archimedes spiral line; alternatively, the planar spiral forming the coil is a logarithmic spiral.
In the magnetic induction wireless power transmission coil provided by the invention, as an option, a planar spiral line forming the coil is manufactured by using a printed circuit board process; alternatively, the planar spiral forming the coil is fabricated using a flexible circuit board process. Alternatively, the planar spiral forming the coil is wound using a single solid wire; alternatively, the planar spiral forming the coil is wound using a single strand of hollow metal wire; alternatively, the planar spiral forming the coil is wound using a multi-strand wire. Alternatively, the planar spiral forming the coil is wound using a plurality of strands (including 2 to 2000 strands) of wire; alternatively, the planar spiral forming the coil is wound using enamelled wire; yet another option is that the planar spiral forming the coil is wound using a wire-wrapped metal wire.
In the magnetic induction wireless power transmission coil provided by the invention, two antisymmetrical spiral coils are made of metal conductors.
In the magnetic induction wireless power transmission coil provided by the invention, the winding directions of the two anti-symmetric spiral coils are opposite.
In the magnetic induction wireless electric energy transmission coil provided by the invention, the sum of the total number of turns of the two anti-symmetric spiral coils ranges from 2 to 10000, the coil adopts a segmented structure, and the number of turns can be an integer or a non-integer.
In the magnetic induction wireless power transmission coil provided by the invention, two anti-symmetric spiral coils are respectively positioned on two layers and are fixed by a magnetic or non-magnetic dielectric plate or a bracket.
In the magnetic induction wireless electric energy transmission coil provided by the invention, two anti-symmetric spiral coils are respectively positioned at two layers, and the layer distance is adjustable.
In the magnetic induction wireless power transmission coil provided by the invention, the lead is made of a metal conductor.
A magnetic induction wireless power transmission system, which includes the aforementioned wireless power transmission coil, and further, the system includes a transmitting end and a receiving end; at the transmitting end, two electrodes of a high-frequency alternating current power supply are connected to two leads of a coil at the transmitting end; at the receiving end, the two leads of the receiving coil are connected to a load.
According to the invention, two magnetic induction wireless electric energy transmission coils with the same working frequency (the parameters such as the number of turns, the size, the distance and the like can be different) are respectively connected to an alternating current power supply and a load, so that a magnetic induction wireless electric energy transmission system without a compensation circuit can be formed.
For a wireless power transmission system using coils, the resonant frequencies of the transmitting coil and the receiving coil should be the same or similar.
In the magnetic induction type wireless electric energy transmission system provided by the invention, a compensation circuit is not needed between the high-frequency alternating current power supply and the transmitting coil, a compensation circuit is not needed between the load and the receiving coil, and the load is an alternating current load or an equivalent alternating current load comprising a rectifier, a filter, a voltage stabilizing circuit and a direct current load.
In the magnetic induction type wireless electric energy transmission system provided by the invention, the number of turns of the transmitting coil and the number of turns of the receiving coil can be the same or different.
In the magnetic induction type wireless electric energy transmission system provided by the invention, the spiral forms of the transmitting coil and the receiving coil can be the same or different.
In the magnetic induction type wireless power transmission system provided by the invention, the diameters of the transmitting coil and the receiving coil can be the same or different.
In the magnetic induction type wireless power transmission system provided by the invention, the processing methods of the transmitting coil and the receiving coil can be the same or different.
Compared with the prior art, the invention has the advantages that:
the coil is composed of two independent plane spiral structures which are not connected with each other. The planes of the two planar spiral structures are parallel to each other, and the winding directions are opposite. The two planar spiral structures are respectively connected to two poles of a high-frequency alternating current power supply or a load. The working frequency of the coil covers 1kHz to 1GHz, and the working frequency can be adjusted by the size, the number of turns and the distance between the planes of the two plane spiral structures: the operating frequency decreases with increasing planar helical structure and increasing number of turns, and decreases with decreasing distance between the planes of the planar helical structure. The planar spiral structure can be wound by a conducting wire, and can also be processed by adopting a printed circuit board (including a flexible printed circuit board) process. Compared with the traditional magnetic induction wireless energy transmission coil structure, the structure does not need an external compensation circuit, can be directly connected to an alternating current power supply at an energy transmitting end, and can be directly connected to an alternating current load or a rectifying circuit at an energy receiving end. The magnetic induction wireless energy transmission system formed by the coil structure has the advantages of simpler and more compact structure and higher reliability due to no compensation circuit, and has great engineering application prospect in the fields of wireless real-time energy supply and wireless charging.
Drawings
Fig. 1 is a schematic structural diagram of a wireless power transmission coil according to a first embodiment of the present invention.
Fig. 2 is a schematic diagram of a magnetic induction wireless power transmission system constructed by using the wireless power transmission coil according to a second embodiment of the present invention.
Detailed Description
The technical solution adopted by the present invention will be further explained with reference to the schematic drawings.
The first embodiment of the present invention provides a wireless power transmission coil, which includes an upper coil 101, a lower coil 102, an upper coil lead 103, and a lower coil lead 104, see fig. 1. The upper coil 101 and the lower coil 102 are located in different planes. The upper coil lead 103 and the lower coil lead 104 jointly form a terminal of the wireless power transmission coil, and the upper coil lead 103 and the lower coil lead 104 have no positive and negative polarity difference because the wireless power transmission system transmits alternating current. The upper coil 101 and the lower coil 102 are respectively made of a magnetic or non-magnetic dielectric plate as a supporting structure, so that the wireless power transmission coil has good mechanical strength and is not easy to deform during use. The supporting dielectric plate may be located between the upper coil 101 and the lower coil 102 or outside of both. The supporting medium plate on one side can adopt a magnetic medium so as to improve the transmission efficiency and reduce the magnetic field leakage. When a wireless power transmission system is formed, the non-magnetic dielectric plate is adopted on the surface of the two coils close to each other.
The plane spiral of the novel coil (wireless power transmission coil) for wireless power transmission without an external compensation circuit comprises but is not limited to an Archimedes spiral, and the preparation process can be a printed circuit board process or a flexible circuit board process, and can also be formed by winding a single-stranded or multi-stranded metal wire.
The second embodiment of the present invention provides a magnetic induction type wireless power transmission system, which comprises two wireless power transmission coils as a transmitting coil and a receiving coil, respectively, an ac power supply 105 and an ac load 106, and the transmitting coil is arranged below the transmitting coil and the receiving coil is arranged above the transmitting coil in fig. 2, referring to fig. 2. Two alternating current electrodes of an alternating current power supply 105 for wireless power transmission are respectively connected to two leads of the transmitting coil, namely, an upper coil lead 103 and a lower coil lead 104. Two alternating current electrodes of an alternating current load 106 for wireless power transmission are respectively connected to two leads of the receiving coil, namely, an upper coil lead 103 and a lower coil lead 104. The alternating current load can be an alternating current electric appliance, and can also be an equivalent alternating current load comprising a rectifying circuit, a filter circuit, a voltage stabilizing circuit and a direct current load.
The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any way. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. The magnetic induction wireless electric energy transmission coil is characterized by comprising two anti-symmetric spiral coils and leads thereof;
the two anti-symmetric spiral coils are mutually and electrically isolated and are in different planes;
the two anti-symmetric spiral coils are both provided with two end points, wherein the outer end point or the inner end point is connected with a lead wire, and the other end point is left empty;
the two antisymmetrical spiral coils are wound in opposite directions.
2. The magnetic induction wireless power transfer coil of claim 1, wherein the two anti-symmetric helical coils are made of metal conductors.
3. The magnetic induction wireless power transfer coil of claim 1, wherein the sum of the total number of turns of the two anti-symmetric helical coils ranges from 2 to 10000;
the coil adopts a segmented structure, and the range of the number of turns is an integer or a non-integer.
4. The magnetic induction wireless power transfer coil of claim 1, wherein the two anti-symmetric helical coils are located at two layers, respectively, and are fixed by a magnetic or non-magnetic dielectric plate or bracket.
5. The magnetic induction wireless power transfer coil of claim 1, wherein the two anti-symmetric helical coils are positioned at two layers and have adjustable layer spacing.
6. The magnetic induction wireless power transfer coil of claim 1, wherein the leads are made of a metallic conductor.
7. A magnetic induction wireless power transfer system comprising a wireless power transfer coil according to any of claims 1-6.
8. The magnetic induction wireless power transfer system of claim 7, comprising a transmitter, a receiver;
at the transmitting end, two electrodes of a high-frequency alternating current power supply are connected to two leads of a coil at the transmitting end;
at the receiving end, the two leads of the receiving coil are connected to a load.
9. The system of claim 8, wherein no compensation circuit is required between the high frequency ac power source and the transmitter coil, no compensation circuit is required between the load and the receiver coil, and the load is an ac load or an equivalent ac load comprising a rectifier, a filter, a regulator, and a dc load.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010002648.8A CN111092497B (en) | 2020-01-02 | 2020-01-02 | Magnetic induction wireless power transmission coil and magnetic induction wireless power transmission system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010002648.8A CN111092497B (en) | 2020-01-02 | 2020-01-02 | Magnetic induction wireless power transmission coil and magnetic induction wireless power transmission system |
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| CN111092497A CN111092497A (en) | 2020-05-01 |
| CN111092497B true CN111092497B (en) | 2022-01-11 |
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| CN113740582A (en) * | 2021-07-27 | 2021-12-03 | 中国电力科学研究院有限公司 | Magnetic field induction coil group for multi-dimensional balance magnetic field measurement, magnetic field sensing array and measurement system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1481207A (en) * | 2002-09-04 | 2004-03-10 | ���ǵ�����ʽ���� | Induction coupling plasma generater combined with two-layer coil antenna |
| CN204012949U (en) * | 2014-06-04 | 2014-12-10 | 中国矿业大学(北京) | Radio energy transmission system based on double-layer double-direction helical coil |
| CN105474459A (en) * | 2013-06-20 | 2016-04-06 | Lg伊诺特有限公司 | Receiving antenna and wireless power receiving apparatus comprising same |
| CN107146700A (en) * | 2017-05-02 | 2017-09-08 | 华中科技大学 | A kind of transmitting coil for being used to realize wireless charging plane constant-voltage charge |
| CN109787367A (en) * | 2019-03-08 | 2019-05-21 | 重庆大学 | EC-WPT system and its parameter optimization method based on stacked coupling mechanism |
-
2020
- 2020-01-02 CN CN202010002648.8A patent/CN111092497B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1481207A (en) * | 2002-09-04 | 2004-03-10 | ���ǵ�����ʽ���� | Induction coupling plasma generater combined with two-layer coil antenna |
| CN105474459A (en) * | 2013-06-20 | 2016-04-06 | Lg伊诺特有限公司 | Receiving antenna and wireless power receiving apparatus comprising same |
| CN204012949U (en) * | 2014-06-04 | 2014-12-10 | 中国矿业大学(北京) | Radio energy transmission system based on double-layer double-direction helical coil |
| CN107146700A (en) * | 2017-05-02 | 2017-09-08 | 华中科技大学 | A kind of transmitting coil for being used to realize wireless charging plane constant-voltage charge |
| CN109787367A (en) * | 2019-03-08 | 2019-05-21 | 重庆大学 | EC-WPT system and its parameter optimization method based on stacked coupling mechanism |
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Effective date of registration: 20211228 Address after: 186 Juxiang Road, Zhangpu Town, Kunshan City, Suzhou, Jiangsu 215321 Applicant after: JIANGSU HUASHENG AUTOMOTIVE ELECTRONICS Co.,Ltd. Address before: 200436 No. 99, upper road, Shanghai, Baoshan District Applicant before: Shanghai University |
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