CN111342567A - Dual-frequency omnidirectional wireless power transmission system - Google Patents
Dual-frequency omnidirectional wireless power transmission system Download PDFInfo
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- CN111342567A CN111342567A CN202010232615.2A CN202010232615A CN111342567A CN 111342567 A CN111342567 A CN 111342567A CN 202010232615 A CN202010232615 A CN 202010232615A CN 111342567 A CN111342567 A CN 111342567A
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- coil
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- matching
- transmitting coil
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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
- 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
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
Abstract
The invention discloses a dual-frequency omnidirectional wireless power transmission system which comprises a transmitting end and a receiving end. The transmitting end comprises a first transmitting coil, a second transmitting coil and a first matching coil; the receiving end comprises a receiving coil and a second matching coil; the first emitting coil is adjusted to work at a first frequency by connecting a first lumped capacitor in series; the second transmitting coil is adjusted to work at a second frequency by connecting a second lumped capacitor in series; the receiving coil is adjusted to work at a first frequency or a second frequency by connecting a third lumped capacitor or a fourth lumped capacitor in series, and corresponds to the double-frequency coil of the transmitting end to achieve optimal transmission efficiency; the first matching coil and the second matching coil are respectively used for matching the impedance of the transmitting end and the impedance of the receiving end to a preset value. The invention adopts a double-frequency omnidirectional wireless power transmission system to respectively supply power for equipment with different working frequencies, and simultaneously solves the problems of transverse offset and angle offset of the system in the charging process.
Description
Technical Field
The invention belongs to the technical field of radio, and particularly relates to a dual-frequency omnidirectional wireless power transmission system.
Background
With the improvement of the living standard of people and the development of science and technology, the information-based society changes the living style and working habits of people, simultaneously, challenges are provided for traditional houses, and more comfortable, convenient and safe home environments attract more and more attention of people. The rise of the internet of things technology brings a brand-new development space for the development of smart homes, so that the smart homes become a new research hotspot. The intelligent home has become a necessary trend and goes deep into thousands of households, and can mutually link various devices in the home through a wireless sensor network technology, so that not only can an information interaction function be provided, but also people can check the working conditions of home information and devices outside the home, thereby having the advantages of being capable of quickly managing housework, monitoring home environment, remotely controlling household electrical equipment and the like.
At present, the appearance of the internet of things enables the functions of the intelligent home system to be richer, diversified and personalized. The wired power supply form is adopted mostly to multiple equipment power supply in the intelligence house, and leads to the circuit ageing easily among the wired charging transmission process, produces transmission loss to easy friction produces the spark, has caused the potential safety hazard, shortens the service life of equipment. Therefore, a more flexible and convenient electric energy transmission mode is urgently needed to be found. The wireless power transmission technology is a mode for realizing electric energy transmission without physical connection, has the advantages of flexibility, convenience, safety, reliability, non-contact power supply, easiness in control, small influence from the outside and the like, and is judged as one of ten scientific research directions which will bring huge changes to human production and life modes in the future by the American magazine of technical comments.
Based on the analysis, it is a better choice to adopt the wireless power transmission technology to supply power to a plurality of devices simultaneously, however, the positions of the devices are not fixed and unchanged, and lateral offset and angular offset exist to a certain extent, which results in lower transmission efficiency. At present, most of research on wireless power transmission systems focuses on single-frequency omnidirectional power transmission, and the mode can solve the problem of offset in the power transmission process. However, the operating frequencies of various devices are different, and a plurality of frequency transmitting terminals are needed to ensure the normal operation of the devices, which not only occupies space resources, but also affects the beauty. Therefore, it is important to design a wireless power transmission system which is not limited by location and can efficiently charge devices with different operating frequencies.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to solve the technical problems that the existing radio transmission equipment is limited by position and cannot charge equipment with different working frequencies at the same time.
To achieve the above object, the present invention provides a dual-band omni-directional wireless power transmission system, comprising: a transmitting end and a receiving end;
the transmitting end comprises a first transmitting coil, a second transmitting coil and a first matching coil; the first transmitting coil and the second transmitting coil are connected through a first metal wire and are planar coils, the parameters of the first transmitting coil and the second transmitting coil are the same, the first transmitting coil and the second transmitting coil are coaxially and longitudinally arranged in parallel, the first matching coil comprises two planar coils which are connected through a second metal wire and have the same parameters, the planar coils are coaxially and longitudinally arranged in parallel, the first matching coil is positioned between the first transmitting coil and the second transmitting coil, and the diameter of the planar coil included by the first matching coil is smaller than that of the first transmitting coil; the plane where the first emitting coil is located is a first plane;
the receiving end comprises a receiving coil and a second matching coil which are coaxially, transversely and coplanar, and the diameter of the second matching coil is smaller than that of the receiving coil; the plane of the receiving coil is a second plane, the included angle between the first plane and the second plane is smaller than a preset angle, and the receiving end can work within an angle range of 360 degrees around the transmitting end on the premise that the size of the included angle is unchanged;
a first lumped capacitor is welded on one side, close to the first transmitting coil, of the first metal wire, and a second lumped capacitor is welded on one side, close to the second transmitting coil, of the first metal wire; the first transmitting coil and the first lumped capacitor are connected in series to enable the working frequency of the first transmitting coil to be a first frequency, and the second transmitting coil and the second lumped capacitor are connected in series to enable the working frequency of the second transmitting coil to be a second frequency.
Optionally, the receiving end further includes: a third lumped capacitor or a fourth lumped capacitor;
the receiving coil is connected with a third lumped capacitor in series, and the receiving end works at a first frequency; or
The receiving coil is connected with a fourth lumped capacitor in series, and the receiving end works at a second frequency.
Optionally, the transmitting end comprises a planar coil which can be wound into a square, a circle, a hexagon or a polygon.
Optionally, the first matching coil is connected to a power supply to supply power to a receiving end of the first frequency and a receiving end of the second frequency.
Optionally, the receiving end is printed on a PCB board.
Optionally, the first matching coil is used to impedance match the transmitting end such that the S11 parameter is below-10 dB.
Optionally, the preset angle is less than or equal to 30 degrees.
Generally, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:
(1) the dual-frequency omnidirectional wireless power transmission system provided by the invention can simultaneously realize efficient transmission of two frequency bands by reasonably designing the impedance matching circuit. The system has the advantages of small volume, simple manufacture and low cost.
(2) The dual-frequency omnidirectional wireless power transmission system provided by the invention can simultaneously supply power to a plurality of devices while meeting the simultaneous working of two frequency bands, is not limited by the placement position, and meets the requirements of practical application.
Drawings
Fig. 1 is a schematic diagram of a dual-band omni-directional wireless power transmission system according to an embodiment of the present invention;
fig. 2 is a schematic front view of a circular dual-band omni-directional transmitting end according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a partial enlargement of the first lumped capacitor and the second lumped capacitor according to the embodiment of the invention;
fig. 4 is a circuit diagram of a dual-band omni-directional transmitting end according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a receiving end rotating around a transmitting end according to an embodiment of the present invention;
fig. 6(a) is a diagram of transmission efficiency of a dual-band system when a receiving end of a square coil rotates 360 degrees according to an embodiment of the present invention;
fig. 6(b) is a diagram of transmission efficiency of a dual-band system when a receiving end of a circular coil rotates 360 degrees according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a receiving end with a tilt angle according to an embodiment of the present invention;
fig. 8 is a diagram of transmission efficiency when a receiving end has a tilt angle according to an embodiment of the present invention;
the same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein: 1 is a transmitting terminal, 10 is a first transmitting coil 10, 11 is a second transmitting coil, 12 is a first matching coil 12, 30 is a first lumped capacitor, 31 is a second lumped capacitor, 2 is a receiving terminal, 20 is a receiving coil, 21 is a second matching coil, 40 is a third lumped capacitor, and 41 is a fourth lumped capacitor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention discloses a dual-frequency omnidirectional wireless power transmission system which comprises a transmitting end and a receiving end. The transmitting end comprises a first transmitting coil, a second transmitting coil and a first matching coil; the receiving end comprises a receiving coil and a second matching coil; the first emitting coil is adjusted to work at a first frequency by connecting a first lumped capacitor in series; the second transmitting coil is adjusted to work at a second frequency by connecting a second lumped capacitor in series; the receiving coil is adjusted to work at a first frequency or a second frequency by serially connecting a third lumped capacitor or a fourth lumped capacitor, and corresponds to the double-frequency coil of the transmitting end to achieve optimal transmission efficiency; the first matching coil and the second matching coil are respectively used for matching the impedance of the transmitting end and the impedance of the receiving end to a preset value; the invention adopts a double-frequency omnidirectional wireless power transmission system to respectively supply power for wireless sensors with different distances and different powers, and simultaneously solves the problems of transverse offset and angular offset of the system in the charging process.
In view of the above technical problems, the technical problem to be solved by the present invention is to provide a dual-band omni-directional wireless power transmission system, which can ensure that a plurality of devices with different operating frequencies operate simultaneously, and can supply power to the devices at 360 degrees, thereby achieving the purpose of reducing cost and reducing space utilization.
In order to achieve the above object, the present invention provides a dual-band omni-directional wireless power transmission system, which includes a transmitting end and a receiving end; the transmitting end comprises a first transmitting coil, a second transmitting coil and a first matching coil; the receiving end comprises a receiving coil and a second matching coil.
Further, the first transmitting coil and the second transmitting coil are coaxially disposed.
Further, the transmitting end can be wound into the shapes of square, circle, hexagon, polygon and the like.
Further, the transmitting terminal can charge the receiving terminal in any direction of 360 degrees.
Further, the transmitting end has two resonant frequencies w01 and w02, w02 is a frequency-doubled or nearly frequency-doubled transmission frequency band of w 01.
Further, the resonant frequency w01 is a series circuit formed by the first transmitting coil and the first lumped capacitor, the resonant frequency w02 is a series circuit formed by the second transmitting coil connected in series with the second lumped capacitor, and the two resonant frequencies are obtained simultaneously.
Further, the dual-frequency transmitting terminal supplies power to the receiving terminals with different frequencies simultaneously.
Further, the receiving terminal is printed on the PCB board.
Furthermore, the resonant frequency of the receiving end is a single frequency, the third lumped capacitor or the fourth lumped capacitor is connected in series to adjust the receiving end to work at the first frequency or the second frequency, and the receiving end corresponds to the dual-frequency coil of the transmitting end so as to achieve the optimal transmission efficiency.
The dual-frequency omnidirectional wireless power transmission system provided by the invention, as shown in fig. 1, comprises a transmitting end 1 and a receiving end 2; the transmitting terminal 1 comprises a first transmitting coil 10, a second transmitting coil 11 and a first matching coil 12; the receiving end 2 comprises a receiving coil 20 and a second matching coil 21.
In the present embodiment, the first transmission coil 10 and the second transmission coil 11 are coaxially disposed. The length of the first transmitting coil 10 and the width of the second transmitting coil 11 are 14cm, the distance between the two coils is 16cm, the length of the first matching coil 12 is 10cm, the width of the first matching coil is 10cm, the height of the first matching coil is 10cm, and the radius of the first transmitting coil 10, the second transmitting coil 11 and the first matching coil 12 is 2 mm. The series circuit formed by the first transmitting coil 10 and the first lumped capacitor 30 enables the coil working frequency to be 13.56MHz, the series circuit formed by the second transmitting coil 11 and the second lumped capacitor 31 in series enables the coil working frequency to be 24.28MHz, and the two resonant frequencies are obtained simultaneously. The first matching coil 12 is used to impedance match the transmitting terminal 1 so that the S11 parameter is below-10 dB.
Fig. 2 is a schematic front view of a circular dual-band omni-directional transmitting end, in this embodiment, a first transmitting coil 10 and a second transmitting coil 11 are coaxially disposed. The radius of the first transmitting coil 10 and the second transmitting coil 11 is 7cm, the distance between the two coils is 16cm, the radius of the first matching coil 12 is 5cm, the height is 10cm, and the line radius of the first transmitting coil 10, the second transmitting coil 11 and the first matching coil 12 is 2 mm. The series circuit formed by the first transmitting coil 10 and the first lumped capacitor 30 enables the coil working frequency to be 13.56MHz, the series circuit formed by the second transmitting coil 11 and the second lumped capacitor 31 in series enables the coil working frequency to be 24.28MHz, and the two resonant frequencies are obtained simultaneously. The first matching coil 12 is used to impedance match the transmitting terminal 1 so that the S11 parameter is below-10 dB.
Fig. 3 is a partially enlarged schematic diagram of the first and second lumped capacitors provided in the embodiment of the present invention, and it can be seen that the first and second lumped capacitors 30 and 31 are soldered on the wire and connected in series with the first and second transmitting coils 10 and 11, respectively.
A receiving end 2 in a dual-frequency omnidirectional wireless power transmission system is printed on an FR4 board by adopting a PCB technology, the resonance frequency of the receiving end 2 is single frequency, a receiving coil 20 is adjusted to work at first or second frequency by connecting a third lumped capacitor 40 or a fourth lumped capacitor 41 in series, the receiving coil corresponds to a dual-frequency coil of a transmitting end 1 to achieve optimal transmission efficiency, a second matching coil 21 adjusts the S11 value of the receiving end to be lower than-10 dB, and the distance between the receiving end and the center of the transmitting end is 17 cm.
In order to analyze the transmission efficiency of the system, wherein an equivalent circuit diagram of the transmitting coil of the dual-frequency omnidirectional system is shown in fig. 4, the first transmitting coil 10 and the second transmitting coil 11 respectively form an equivalent circuit 1 and an equivalent circuit 2, thereby realizing dual-frequency wireless power supply.
Wherein VSThe input voltage represented; rS' represents the internal resistance of the first matching coil itself, which may be 50 ohms; rS，RT1And RT2Respectively representing the resistances of the first matching coil, the first transmitting coil and the second transmitting coil; l isS，LT1And LT2Equivalent inductances of the first matching coil, the first transmitting coil and the second transmitting coil respectively; mT12Representing a mutual inductance between the first transmit coil and the second transmit coil; cT1And CT2Respectively, a first lumped capacitor and a second lumped capacitor connected in series with the first transmitting coil and the second transmitting coil.
In analyzing the circuit model, all the mutual inductances are taken into consideration, including the mutual inductances between the first matching coil 12 and the first and second transmission coils 10, 11, the mutual inductance between the first matching coil 12 and the second matching coil 21, the mutual inductance between the first matching coil 12 and the reception coil 20, the mutual inductances between the first transmission coil 10, the second transmission coil 11 and the second matching coil 21, and the mutual inductance between the reception coil 20 and the second matching coil 21.
To verify the effectiveness of the proposed system, the receiving end 2 is adjusted to 13.56MHz and 24.28MHz, respectively, and the receiving end 2 rotates 360 degrees around the transmitting end 1 to monitor the system efficiency, as shown in fig. 5. The transmission efficiency of the square and circular coils at two frequencies is shown in fig. 6(a) and 6(b), respectively. It can be seen that the designed wireless power transmission system keeps the transmission efficiency basically consistent at any angle, and can supply power to equipment with two frequencies. In addition, the transmission efficiency of the square system is higher than that of the circular system.
In practical application scenarios, the angle of the receiving end 2 may not be completely parallel to the transmitting end 1, and there may be a certain degree of angle, as shown in fig. 7. In order to explore the rule of the transmission efficiency when a receiving end has a certain angle, experimental verification is carried out. Fig. 8 is a diagram of transmission efficiency when a tilt angle is present at the receiving end. It was found that the transmission efficiency of the system is substantially constant when the receiving end 2 has a small angle of tilt. Wherein the small angle may be less than or equal to 30 degrees.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A dual-band omni-directional wireless power transmission system, comprising: a transmitting end and a receiving end;
the transmitting end comprises a first transmitting coil, a second transmitting coil and a first matching coil; the first transmitting coil and the second transmitting coil are connected through a first metal wire and are planar coils, the parameters of the first transmitting coil and the second transmitting coil are the same, the first transmitting coil and the second transmitting coil are coaxially and longitudinally arranged in parallel, the first matching coil comprises two planar coils which are connected through a second metal wire and have the same parameters, the planar coils are coaxially and longitudinally arranged in parallel, the first matching coil is positioned between the first transmitting coil and the second transmitting coil, and the diameter of the planar coil included by the first matching coil is smaller than that of the first transmitting coil; the plane where the first emitting coil is located is a first plane;
the receiving end comprises a receiving coil and a second matching coil which are coaxially, transversely and coplanar, and the diameter of the second matching coil is smaller than that of the receiving coil; the plane of the receiving coil is a second plane, the included angle between the first plane and the second plane is smaller than a preset angle, and the receiving end can work within an angle range of 360 degrees around the transmitting end on the premise that the size of the included angle is unchanged;
a first lumped capacitor is welded on one side, close to the first transmitting coil, of the first metal wire, and a second lumped capacitor is welded on one side, close to the second transmitting coil, of the first metal wire; the first transmitting coil and the first lumped capacitor are connected in series to enable the working frequency of the first transmitting coil to be a first frequency, and the second transmitting coil and the second lumped capacitor are connected in series to enable the working frequency of the second transmitting coil to be a second frequency.
2. The dual-band omni-directional wireless power transmission system according to claim 1, wherein the receiving end further comprises: a third lumped capacitor or a fourth lumped capacitor;
the receiving coil is connected with a third lumped capacitor in series, and the receiving end works at a first frequency; or
The receiving coil is connected with a fourth lumped capacitor in series, and the receiving end works at a second frequency.
3. The dual-band omni-directional wireless power transmission system according to claim 1, wherein the transmitting end comprises a planar coil wound in a square, circular, hexagonal or polygonal shape.
4. The dual-band omni-directional wireless power transmission system according to claim 1, wherein the first matching coil is connected to a power supply to supply power to a receiving end of a first frequency and a receiving end of a second frequency.
5. The dual-band omni-directional wireless power transmission system according to claim 1, wherein the receiving end is printed on a PCB board.
6. The dual-band omni-directional wireless power transmission system according to any one of claims 1 to 4, wherein the first matching coil is used to impedance match a transmitting end such that the S11 parameter is below-10 dB.
7. The dual-band omni-directional wireless power transmission system according to any one of claims 1 to 4, wherein the preset angle is less than or equal to 30 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010232615.2A CN111342567A (en) | 2020-03-28 | 2020-03-28 | Dual-frequency omnidirectional wireless power transmission system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010232615.2A CN111342567A (en) | 2020-03-28 | 2020-03-28 | Dual-frequency omnidirectional wireless power transmission system |
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| CN111342567A true CN111342567A (en) | 2020-06-26 |
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| CN202010232615.2A Pending CN111342567A (en) | 2020-03-28 | 2020-03-28 | Dual-frequency omnidirectional wireless power transmission system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113300478A (en) * | 2021-05-26 | 2021-08-24 | 华中科技大学 | Anti-deviation wireless power transmission system for implantable medical equipment |
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| US20160099599A1 (en) * | 2014-10-03 | 2016-04-07 | Primax Electronics Ltd. | Wireless power transmission device |
| CN107408840A (en) * | 2015-03-06 | 2017-11-28 | 三星电子株式会社 | Wireless power transmitter |
| CN107689649A (en) * | 2016-08-04 | 2018-02-13 | 通用电气公司 | System and method for being charged to acceptor device |
| CN209913584U (en) * | 2019-04-25 | 2020-01-07 | 武汉大学 | Double-frequency wireless power transmission system with relay coil |
| CN110768310A (en) * | 2018-07-25 | 2020-02-07 | Oppo广东移动通信有限公司 | Charging device, electronic device and electronic system |
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2020
- 2020-03-28 CN CN202010232615.2A patent/CN111342567A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160099599A1 (en) * | 2014-10-03 | 2016-04-07 | Primax Electronics Ltd. | Wireless power transmission device |
| CN107408840A (en) * | 2015-03-06 | 2017-11-28 | 三星电子株式会社 | Wireless power transmitter |
| CN107689649A (en) * | 2016-08-04 | 2018-02-13 | 通用电气公司 | System and method for being charged to acceptor device |
| CN110768310A (en) * | 2018-07-25 | 2020-02-07 | Oppo广东移动通信有限公司 | Charging device, electronic device and electronic system |
| CN209913584U (en) * | 2019-04-25 | 2020-01-07 | 武汉大学 | Double-frequency wireless power transmission system with relay coil |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113300478A (en) * | 2021-05-26 | 2021-08-24 | 华中科技大学 | Anti-deviation wireless power transmission system for implantable medical equipment |
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Application publication date: 20200626 |