CN113285533A - Transmitting antenna for improving degree of freedom and distance for magnetic resonance wireless power transmission - Google Patents
Transmitting antenna for improving degree of freedom and distance for magnetic resonance wireless power transmission Download PDFInfo
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- CN113285533A CN113285533A CN202110707824.2A CN202110707824A CN113285533A CN 113285533 A CN113285533 A CN 113285533A CN 202110707824 A CN202110707824 A CN 202110707824A CN 113285533 A CN113285533 A CN 113285533A
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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
- H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
- H02J50/23—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves characterised by the type of transmitting antennas, e.g. directional array antennas or Yagi antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
Abstract
The invention discloses a transmitting antenna for improving the degree of freedom and distance in magnetic resonance wireless power transmission, which comprises an exciting coil and a transmitting resonant coil; the exciting coil is a planar multi-turn coil; the transmitting resonance coil is formed by connecting two planar multi-turn coils in series; the exciting coil is used for feeding electromagnetic energy and coupling the electromagnetic energy to the transmitting resonance coil, and the transmitting resonance coil couples the electromagnetic energy to the receiving coil through magnetic resonance. When different charging distances and high-distance inclination angles exist, the transmission efficiency of the transmitting antenna is kept stable; the invention is a broadband matching structure, when the antenna is received at different positions in the field of the transmitting antenna, the input impedance of the transmitting antenna changes little, and the matching between the output impedance of the power amplifier and the input impedance of the transmitting antenna is ensured.
Description
Technical Field
The invention belongs to the technical field of wireless power transmission, and particularly relates to a transmitting antenna for improving the degree of freedom and distance in magnetic resonance wireless power transmission.
Background
With the continuous development of electronic information technology and automation control technology, various home appliances, consumer electronics, mobile communication devices, etc. have been widely popularized, however, the conventional home appliances rely on the wired connection between the power line and the power socket to supply power, and the electronic devices using the built-in battery also need the wired connection between the charging wire and the power socket to charge, so we can see the wires for supplying power to the electronic devices everywhere. The wires not only occupy the activity space of people and limit the convenience of equipment use, but also create the hidden danger of safe electricity utilization. Therefore, with the increasing demand of people for portable devices and green energy systems that can be used completely wirelessly, research and application of wireless energy transmission technology is rapidly becoming the focus of academic and industrial circles at home and abroad. Currently, wireless charging technologies recognized in the industry are mainly classified into three types, one is the QI standard mainly pushed by the WPC alliance and is also called as a magnetic induction coupling technology, the other is a magnetic resonance coupling technology mainly pushed by the Airfuel alliance and is also an electromagnetic radiation type wireless energy transmission technology. Compared with a magnetic induction technology, the magnetic resonance coupling technology has obvious advantages in charging distance, spatial degree of freedom, one-to-many charging and power expansion; compared with the electromagnetic radiation type wireless energy transmission technology, the magnetic resonance coupling technology has more practical application value in the aspects of energy conversion efficiency, transmission power and electromagnetic safety. At present, this technique has been applied to equipment such as intelligence wearing, robot, AGV of sweeping floor gradually, gives the wireless function of charging of equipment to improve equipment's security and intelligent degree, promote user's use and experience. In addition, the application of the magnetic resonance coupling technology in the field of smart home will also subvert the use modes of traditional household appliances, mobile communication equipment and consumer electronics, a residence is used as a platform, all power lines in a home living area are thoroughly removed by utilizing a magnetic resonance wireless charging technology, a hidden wiring technology and an automatic control technology, wireless charging or continuous electric energy supply is carried out on the equipment, the safety, the convenience and the comfort of home are improved, and a high-efficiency, environment-friendly and energy-saving living environment is constructed.
The currently disclosed transmitting antenna for magnetic resonance wireless charging of electronic devices is mostly in a common single spiral winding manner, so that the following disadvantages exist: firstly, when receiving and transmitting are parallel, the horizontal degree of freedom is poor, namely, the difference of the transmission efficiency of a receiving antenna at different positions of a transmitting antenna is large; secondly, the horizontal degree of freedom is poor when the receiving antenna and the transmitting antenna form a certain angle; third, the common single spiral winding belongs to narrow band matching, and the input impedance of the transmitting antenna of the receiving antenna at different positions is greatly changed.
Disclosure of Invention
The invention aims to solve the problems that the horizontal degree of freedom of wireless power transmission in the current market is poor when receiving and transmitting antennas are parallel, the transmission efficiency of the receiving and transmitting antennas at different positions is greatly different when the receiving and transmitting antennas are at a certain angle, and the input impedance of the transmitting antenna is greatly changed when the receiving antenna is at different positions or different distances.
The technical scheme of the invention is as follows: a transmitting antenna for magnetic resonance wireless power transmission to improve the degree of freedom and distance comprises an exciting coil and a transmitting resonant coil;
the exciting coil is a planar multi-turn coil; the transmitting resonance coil is formed by connecting two planar multi-turn coils in series; the exciting coil is used for feeding electromagnetic energy and coupling the electromagnetic energy to the transmitting resonance coil, and the transmitting resonance coil couples the electromagnetic energy to the receiving coil through magnetic resonance.
Furthermore, edges and corners of the excitation coil and the emission resonance coil are both of smooth arc structures.
Furthermore, the exciting coil comprises a first microstrip line, a first connecting point of the exciting coil, a second microstrip line and a transmitting electromagnetic energy input port;
the first microstrip line is connected with the second microstrip line through a first connecting point of the exciting coil; the first electromagnetic energy input port is arranged on the first microstrip line.
Further, the adjustable capacitance of the exciting coil is 1pF-10 nF;
the length L _ Tx _ Driver of the first microstrip line is 100mm-300 mm;
the width H _ Tx _ Driver of the first microstrip line is 100mm-300 mm;
the width W _ Tx _ Driver of the microstrip line in the first microstrip line is 4mm-8 mm;
the gap S _ Tx _ Driver of the adjacent microstrip line in the first microstrip line is 3mm-7 mm.
Further, the transmission resonance coil is formed by two coils connected in series, and the centers of the two coils are deviated to two opposite directions.
Further, the transmitting resonant coil comprises a first resonant microstrip line, a second resonant microstrip line, a resonant coil first connection point, a resonant coil second connection point, a resonant port, a third resonant microstrip line, a resonant coil third connection point, a resonant coil fourth connection point and a fourth resonant microstrip line;
the first resonance microstrip line is connected with the second resonance microstrip line through a first connecting point of the resonance coil and a second connecting point of the resonance coil; the third resonance microstrip line passes through a third connecting point of the resonance coil and a fourth resonance microstrip line; the resonance port is arranged on the first resonance microstrip line.
Further, the adjustable capacitance of the transmitting resonance coil array is 1pF-10 nF;
the length L _ Tx _ Res of the first resonance microstrip line is 100mm-300 mm;
the width H _ Tx _ Res of the first resonance microstrip line is 100mm-300 mm;
the line width W _ Tx _ Res of the first resonance microstrip line is 4mm-8 mm;
the gap S _ Tx _ Res of the adjacent microstrip line in the first resonant microstrip line is 3mm-7 mm.
Furthermore, the first microstrip line and the first resonance microstrip line are rectangular coils with gaps; the notches are connected with resonant capacitors to form a high-frequency structure.
The invention has the beneficial effects that:
(1) when different charging distances and high-distance inclination angles exist, the transmission efficiency of the transmitting antenna is kept stable; the invention is a broadband matching structure, when the antenna is received at different positions in the field of the transmitting antenna, the input impedance of the transmitting antenna changes little, and the matching between the output impedance of the power amplifier and the input impedance of the transmitting antenna is ensured.
(2) The transmitting antenna improves the condition of poor horizontal degree of freedom of the traditional spiral winding, so that the variation range of the input impedance of the transmitting antenna is very small, the impedance matching between the output impedance of a power amplifier and the input impedance of the transmitting antenna is better realized, and when the charging distance and the included angle between the transmitting antenna and the receiving antenna are changed, the transmission efficiency is kept stable.
Drawings
FIG. 1 is a top view of an excitation coil;
FIG. 2 is a top view of a transmit resonant coil;
FIG. 3 is a top view of a receive coil;
FIG. 4 is a side view of the excitation coil and the resonant coil taken together;
FIG. 5 is a top view of different positions when receiving and transmitting are parallel;
FIG. 6 is a side view of different positions of receive and transmit parallelism;
FIG. 7 is a diagram of transmission efficiency at different positions when a transmitting common helical structure receives and transmits in parallel;
FIG. 8 is a top view of different positions at an angle of reception and transmission;
FIG. 9 is a side view of different positions at an angle of reception and transmission;
FIG. 10 is a graph of transmission efficiency at different positions when the transmitting conventional helical structure is angled for reception and transmission;
FIG. 11 is a graph of transmission efficiency at different positions when the transmitting antenna excites the resonant structure to receive and transmit in parallel;
FIG. 12 is a graph of transmission efficiency at different positions when the transmitting antenna excites the resonant structure to receive and transmit at an angle;
in the figure, 101, a first microstrip line; 102. an excitation coil first connection point; 103. a second microstrip line; 104. a transmitting electromagnetic energy input port; 201. a first resonant microstrip line; 202. a second resonant microstrip line; 203. a resonant coil first connection point; 204. a resonant coil second connection point; 205. a resonant port; 206. a third resonant microstrip line; 207. a third connection point of the resonant coil; 208. a resonant coil fourth connection point; 209. a fourth resonant microstrip line; 301. a first receiving microstrip line; 302. an input port for receiving electromagnetic energy; 303. a second receive microstrip line; 304. a connection point is received.
Detailed Description
The embodiments of the present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides a transmitting antenna for magnetic resonance wireless power transmission with improved degree of freedom and distance, including a transmitting antenna for magnetic resonance wireless power transmission and a receiving antenna for wireless power reception;
the transmitting antenna is an excitation resonance structure and comprises an excitation coil and a transmitting resonance coil; the exciting coil is a planar multi-turn coil; the transmitting resonance coil is formed by connecting two planar multi-turn coils in series; the exciting coil is used for feeding electromagnetic energy and coupling the electromagnetic energy to the transmitting resonance coil, and the transmitting resonance coil couples the electromagnetic energy to the receiving coil through magnetic resonance. Two multi-turn coils in the transmitting resonance coil can be crossed and overlapped or not, and are distributed at different spatial positions during overlapping, so that the two multi-turn coils are not influenced by each other.
The receiving antenna comprises a receiving coil; the receiving coil is a planar multi-turn coil and is used for receiving the electromagnetic energy transmitted by the transmitting resonant coil. The receiving coil includes a printed circuit and a dielectric plate.
In the embodiment of the invention, the edges and corners of the exciting coil, the transmitting resonant coil and the receiving coil are all of smooth circular arc structures.
The size and shape of the transmission resonance coil are the same as or different from those of the excitation coil.
In the embodiment of the present invention, as shown in fig. 1, the exciting coil includes a first microstrip line 101, an exciting coil first connection point 102, a second microstrip line 103, and a transmitting electromagnetic energy input port 104;
the first microstrip line 101 is connected with the second microstrip line 103 through an exciting coil first connecting point 102; the first electromagnetic energy input port 104 is disposed on the first microstrip line 101.
The exciting coil comprises a first microstrip line and a second microstrip line playing a role in connection, the first microstrip line is a rectangular coil with a gap, a first connecting point and a transmitting electromagnetic energy input port are arranged on the first microstrip line, and the first microstrip line is enabled to form a high-frequency structure through the first connecting point of the exciting coil. Electromagnetic energy is fed in through the first electromagnetic energy input port, passes through the first microstrip line, the first connecting point of the exciting coil and the second microstrip line and then is emitted to the near-field space where the resonant coil is located. The electromagnetic energy input port is directly connected with a power amplifier source after passing through the matching circuit, radio frequency signals are input into the exciting coil, and the first microstrip line forms a high-frequency structure with the exciting coil through the microstrip line.
In the embodiment of the invention, the adjustable capacitance of the exciting coil is 1pF-10 nF;
as shown in fig. 1, the length L _ Tx _ Driver of the first microstrip line 101 is 100mm to 300 mm;
the width H _ Tx _ Driver of the first microstrip line 101 is 100mm-300 mm;
the width W _ Tx _ Driver of the microstrip line in the first microstrip line 101 is 4mm-8 mm;
the gap S _ Tx _ Driver of the adjacent microstrip line in the first microstrip line 101 is 3mm to 7 mm.
In the embodiment of the invention, as shown in fig. 2, the transmitting resonant coil is formed by connecting two coils in series, the size and the number of turns of the two small coils are different, and the centers of the two coils are deviated to two opposite directions.
In the embodiment of the present invention, as shown in fig. 2, the transmitting resonant coil includes a first resonant microstrip line 201, a second resonant microstrip line 202, a resonant coil first connection point 203, a resonant coil second connection point 204, a resonant port 205, a third resonant microstrip line 206, a resonant coil third connection point 207, a resonant coil fourth connection point 208, and a fourth resonant microstrip line 209;
the first resonant microstrip line 201 is connected with the second resonant microstrip line 202 through a resonant coil first connection point 203 and a resonant coil second connection point 204; the third resonant microstrip line 206 passes through a resonant coil third connection point 207 and a resonant coil fourth connection point 208 and a fourth resonant microstrip line 209; the resonant port 205 is disposed on the first resonant microstrip line 201.
The transmitting antenna consists of an exciting coil and a transmitting resonant coil, wherein the exciting coil and the resonant coil are not connected, and the transmitting resonant coil feeds power in an inductive coupling feeding mode, so that no violent current discontinuous point exists on the antenna; the combined antenna structure of the exciting coil and the resonant coil can enable the transmitting antenna to have a wide input impedance bandwidth, namely when the position or height of the receiving antenna changes, the input impedance change range of the transmitting antenna is small, impedance matching between the defense output impedance and the antenna input impedance is facilitated, all parts of the antenna are separated and can be optimized respectively, the manufacturing process is relatively simple, physical manufacturing is easy, and the transmitting antenna structure is processed by adopting a metal cutting process, so that the transmitting antenna with a higher Q value can be obtained. Finally, the size difference of the receiving and transmitting antennas is large, when the charging distance and the included angle between the receiving and transmitting antennas are changed, the transmission efficiency is kept stable, and the requirements of wireless charging and power supply of a plurality of electronic devices can be met. Meanwhile, the length L _ Tx _ Driver and the width H _ Tx _ Driver of the excitation coil are not limited to the above-mentioned specific values, but may be specifically adjusted according to the size and structure of the transmission resonant coil.
In the embodiment of the invention, the adjustable capacitance of the transmitting resonance coil array is 1pF-10 nF;
as shown in fig. 2, the length L _ Tx _ Res of the first resonant microstrip line 201 is 100mm to 300 mm;
the width H _ Tx _ Res of the first resonant microstrip line 201 is 100mm to 300 mm;
the line width W _ Tx _ Res of the first resonant microstrip line 201 is 4mm to 8 mm;
the gap S _ Tx _ Res between adjacent ones of the first resonant microstrip lines 201 is 3mm to 7 mm.
According to the invention, through the optimized setting of each geometric parameter and electrical parameter in the transmitting antenna, the planar antenna structure of the exciting coil and the transmitting resonant coil array is adopted, and the resonant coil is fed by using an inductive coupling feeding mode, so that the receiving coil can keep a strong coupling state as far as possible, when the charging distance and the included angle between the transmitting and receiving antennas are changed, the transmission efficiency between the transmitting and receiving coils is kept at a higher state, the stable and efficient transmission efficiency is kept, the transmitting antenna is kept in a smaller change range, and the impedance matching between the power amplifier and the antenna is easy to realize.
In the embodiment of the present invention, as shown in fig. 3, the receiving coil includes a first receiving microstrip line 301, a receiving electromagnetic energy input port 302, a second receiving microstrip line 303, and a receiving connection point 304;
the first receiving microstrip line 301 is connected to the second receiving microstrip line 303 through a receiving connection point 304; the receiving electromagnetic energy input port 302 is disposed on the first receiving microstrip line 301.
In the embodiment of the invention, the adjustable capacitance of the receiving coil is 1pF-10 nF;
as shown in fig. 3, the length L _ Rx _ Load of the first receiving microstrip line 301 is 80mm to 140 mm;
the width H _ Rx _ Load of the first receiving microstrip line 301 is 50mm to 75 mm;
the line width W _ Rx _ Load of the first receiving microstrip line 301 is 1mm to 3 mm;
the gap S _ Rx _ Load between adjacent microstrip lines in the first receiving microstrip line 301 is 0.5mm to 1.5 mm.
The receiving antenna is of a multi-turn plane winding structure, adopts a printed circuit board processing technology and is rectangular in shape. The invention improves the coupling strength between the receiving and transmitting magnetic resonance coils and the quality factor of the receiving coil by optimizing the geometric parameters and the electrical parameters in the receiving antenna while ensuring the miniaturization of the receiving antenna, so as to be suitable for receiving wireless charging energy signals of electronic consumer products, communication equipment and LED lighting equipment, and a three-dimensional uniform magnetic field is formed in a transmitting field formed by the exciting coil and the resonance array coil, so that the stable and efficient transmission efficiency and the input impedance of the transmitting antenna with small variation range can be kept no matter the receiving antenna is placed at any position in the transmitting field of the transmitting antenna.
In the embodiment of the present invention, the first microstrip line 101, the first resonant microstrip line 201, and the first receiving microstrip line 301 are rectangular coils with gaps; the notches are connected with resonant capacitors to form a high-frequency structure.
In an embodiment of the present invention, fig. 4 is an integrated side view of an excitation coil and a resonance coil; the transmitting antenna consists of an exciting coil and a transmitting resonant coil, the size of the exciting coil is the same as that of the transmitting coil, the exciting coil and the transmitting resonant coil are overlapped, a certain interval is reserved between the exciting coil and the transmitting resonant coil, and the exciting coil can be arranged on the upper surface of the resonant coil or below the resonant coil.
In an embodiment of the present invention, fig. 5 is a top view of different positions when receiving and transmitting are parallel, wherein point a represents the center point of the receiving coil and points B-M represent the positions to which point a moves.
In the embodiment of the invention, fig. 6 is a top view of different positions when receiving and transmitting are parallel, wherein, point A represents the central point of the receiving coil, and points B-M represent the positions to which point A moves.
In the embodiment of the present invention, fig. 7 is a diagram of transmission efficiency at different positions when the transmitting common helical structure receives and transmits in parallel, where B-M represents the transmission efficiency at point a and point B-M, and it can be seen that when the transmitting antenna is a common helical winding, the transmission efficiency changes greatly, that is, the overall horizontal degree of freedom is poor, along with the change of the position of the receiving antenna in the transmitting antenna.
In an embodiment of the present invention, fig. 8 is a top view of different positions when the receiving and transmitting are at an angle, showing the top view of different positions when the receiving and transmitting are parallel, wherein point a represents the center point of the receiving coil, and points B-M represent the positions to which point a moves.
In an embodiment of the present invention, FIG. 9 is a side view of different positions of a receiver at an angle to a transmitter, where point A represents the center point of the receiver coil and points B-M represent the positions to which point A is moved.
In the embodiment of the present invention, fig. 10 is a diagram of transmission efficiency at different positions when the transmitting and receiving of the common spiral structure are at an angle, and it can be seen from the diagram that in the process of moving from the point B to the point M, the transmission efficiency of the transmitting and receiving antenna is slightly increased and then sharply decreased, and the total horizontal degree of freedom is very poor when the point M is less than twenty percent.
In the embodiment of the present invention, fig. 11 is a diagram of transmission efficiency at different positions when the excited resonant structure of the transmitting antenna receives and transmits data in parallel, the change of the overall transmission efficiency of the receiving antenna along with the change of the position is not large, and compared with the transmitting antenna which is a common helical structure, the overall horizontal degree of freedom of the excited resonant structure transmitting antenna is significantly improved.
In the embodiment of the present invention, fig. 12 is a diagram of transmission efficiency at different positions when the transmitting antenna excites the resonant structure to receive and transmit at an angle, and when the receiving antenna moves from the point B to the point M, the transmission efficiency between the transmitting and receiving antennas still changes greatly, the transmission efficiency is slightly improved, and then the transmission efficiency is gradually reduced with the distance from the point M, but the reduction is more gradual, so that the efficiency is greatly improved and the horizontal degree of freedom is greatly improved compared with a common winding structure.
In the embodiment of the present invention, the geometric structures of the excitation coil, the receiving coil and the transmission resonance coil include a circle, a rectangle and a rhombus; the exciting coil can be arranged above the transmitting resonant coil or below the resonant coil, the resonant coil resonates near the working frequency through a series capacitor, electromagnetic energy is fed from the exciting coil, the electromagnetic energy is transmitted into the air through the exciting coil, the resonant coil receives the energy transmitted by the exciting coil and then transmits the energy into the air, the distribution of a magnetic field can be changed through the structure of the resonant coil, the magnetic field is uniformly distributed on the whole transmitting plane, and therefore the horizontal degree of freedom between the transmitting antenna and the receiving antenna is improved; the resonance coil is formed by connecting two small coils in series, and the centers of the two small coils are deviated to two opposite directions, so that the magnetic field distribution of the transmitting antenna is deflected to the edge to improve the horizontal degree of freedom of the transmitting and receiving antenna.
The exciting coil and the resonance coil in the transmitting antenna adopt a metal cutting process to obtain the transmitting antenna with higher quality factor, and the material is a red copper plate with the thickness of 1 mm; the receiving antenna adopts a PCB process or a metal cutting process.
In this embodiment, it can be known from the equivalent circuit that the transceiver antenna adopts the design of the exciting coil, the receiving coil and the resonant coil array, and the matching circuits of the exciting coil and the receiving coil can be differential circuits, or from the perspective of the antenna end, a resonant capacitor is connected in parallel and a resonant capacitor is connected in series, and the capacitance value ranges of the two matching circuits of the exciting coil and the receiving coil are both 1pF-10 nF; the matching circuit of the transmitting resonance coil array is only connected with one resonance capacitor in series, wherein the value range of the capacitance value is 1pF-10nF, and the inductive coupling between the exciting coil and the transmitting resonance coil array, the resonant coupling between the transmitting resonance coil array and the receiving resonance coil array and the inductive coupling between the receiving resonance coil array and the receiving coil are realized through the resonance capacitor, so that a magnetic field which is uniformly distributed in a three-dimensional mode can be formed. The resonant coil in the circuit uses an inductive coupling feed mode, which is a non-contact excitation mechanism, all parts of the antenna are separated and can be respectively optimized, and the manufacturing process is relatively simple; the antenna adopting the feed mode has no violent current discontinuous points, can obtain wider impedance bandwidth, and is relatively easier to adjust impedance matching.
The working principle and the process of the invention are as follows: in order to provide a stable wireless power supply scheme for portable computers, communication products and consumer electronics products in a certain three-dimensional space range when the charging distance and the included angle between the transmitting and receiving antennas are changed, the invention provides a transmitting antenna for magnetic resonance wireless power transmission based on a magnetic resonance coupling wireless power transmission scheme.
The excitation is added on the excitation coil at the bottom of the transmitting antenna, the excitation signal generates electromagnetic oscillation on the first microstrip line 101, then the electromagnetic energy is transmitted to the first resonance coil 201 in a magnetic induction coupling feeding mode, then the transmitting resonance coil array is coupled with the receiving coil, the electromagnetic energy is transmitted into the first receiving microstrip line 301, the electromagnetic energy is output from a receiving electromagnetic energy output port 302 of the receiving antenna, and the electromagnetic energy is supplied to electronic consumer products, communication equipment and LED lighting equipment after rectification and voltage stabilization.
The invention has the beneficial effects that:
(1) when different charging distances and high-distance inclination angles exist, the transmission efficiency of the transmitting antenna is kept stable; the invention is a broadband matching structure, when the antenna is received at different positions in the field of the transmitting antenna, the input impedance of the transmitting antenna changes little, and the matching between the output impedance of the power amplifier and the input impedance of the transmitting antenna is ensured.
(2) The transmitting antenna improves the condition of poor horizontal degree of freedom of the traditional spiral winding, so that the variation range of the input impedance of the transmitting antenna is very small, the impedance matching between the output impedance of a power amplifier and the input impedance of the transmitting antenna is better realized, and when the charging distance and the included angle between the transmitting antenna and the receiving antenna are changed, the transmission efficiency is kept stable.
It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited embodiments and examples. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.
Claims (8)
1. A transmitting antenna for magnetic resonance wireless power transmission to improve the degree of freedom and distance is characterized by comprising an exciting coil and a transmitting resonant coil;
the exciting coil is a planar multi-turn coil; the transmitting resonance coil is formed by connecting two planar multi-turn coils in series; the exciting coil is used for feeding electromagnetic energy and coupling the electromagnetic energy to a transmitting resonance coil, and the transmitting resonance coil is used for coupling the electromagnetic energy to a receiving coil through magnetic resonance.
2. The transmitting antenna for improving the degree of freedom and distance of magnetic resonance wireless power transmission according to claim 1, wherein the corners of the exciting coil and the transmitting resonant coil are both smooth circular arc structures.
3. The transmitting antenna for improving the degree of freedom and the distance of magnetic resonance wireless power transmission according to claim 1, wherein the exciting coil comprises a first microstrip line (101), an exciting coil first connecting point (102), a second microstrip line (103) and a transmitting electromagnetic energy input port (104);
the first microstrip line (101) is connected with the second microstrip line (103) through an exciting coil first connecting point (102); the first electromagnetic energy input port (104) is arranged on the first microstrip line (101).
4. The transmit antenna for magnetic resonance wireless power transfer with increased degrees of freedom and distance as recited in claim 3, wherein the adjustable capacitance of the excitation coil is 1pF-10 nF;
the length L _ Tx _ Driver of the first microstrip line (101) is 100mm-300 mm;
the width H _ Tx _ Driver of the first microstrip line (101) is 100mm-300 mm;
the width W _ Tx _ Driver of the microstrip line in the first microstrip line (101) is 4mm-8 mm;
the gap S _ Tx _ Driver of the adjacent microstrip line in the first microstrip line (101) is 3mm-7 mm.
5. The transmit antenna for magnetic resonance wireless power transmission with improved degree of freedom and distance according to claim 1, wherein the transmit resonant coil is formed by two coils connected in series, and the centers of the two coils are deviated to two opposite directions.
6. The transmitting antenna for magnetic resonance wireless power transmission with improved degree of freedom and distance according to claim 1, wherein the transmitting resonant coil comprises a first resonant microstrip line (201), a second resonant microstrip line (202), a resonant coil first connection point (203), a resonant coil second connection point (204), a resonant port (205), a third resonant microstrip line (206), a resonant coil third connection point (207), a resonant coil fourth connection point (208) and a fourth resonant microstrip line (209);
the first resonance microstrip line (201) is connected with the second resonance microstrip line (202) through a resonance coil first connection point (203) and a resonance coil second connection point (204); the third resonance microstrip line (206) is connected with a fourth resonance microstrip line (209) through a third connection point (207) of the resonance coil and a fourth connection point (208) of the resonance coil; the resonance port (205) is arranged on the first resonance microstrip line (201).
7. The transmit antenna for magnetic resonance wireless power transfer with increased degrees of freedom and distance as recited in claim 6, wherein the tunable capacitance of the transmit resonant coil array is 1pF-10 nF;
the length L _ Tx _ Res of the first resonance microstrip line (201) is 100mm-300 mm;
the width H _ Tx _ Res of the first resonance microstrip line (201) is 100mm-300 mm;
the line width W _ Tx _ Res of the first resonance microstrip line (201) is 4mm-8 mm;
the gap S _ Tx _ Res of the adjacent microstrip line in the first resonance microstrip line (201) is 3mm-7 mm.
8. The transmit antenna for magnetic resonance wireless power transmission with improved degree of freedom and distance according to claim 7, characterized in that the first microstrip line (101) and the first resonant microstrip line (201) are rectangular coils with gaps; the notches are connected with resonant capacitors to form a high-frequency structure.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113497492A (en) * | 2021-09-07 | 2021-10-12 | 成都斯普奥汀科技有限公司 | Three-dimensional polyhedron magnetic resonance wireless charging transmission device based on multi-antenna switching |
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2021
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113497492A (en) * | 2021-09-07 | 2021-10-12 | 成都斯普奥汀科技有限公司 | Three-dimensional polyhedron magnetic resonance wireless charging transmission device based on multi-antenna switching |
| CN113497492B (en) * | 2021-09-07 | 2021-12-07 | 成都斯普奥汀科技有限公司 | Three-dimensional polyhedron magnetic resonance wireless charging transmission device based on multi-antenna switching |
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