High-robustness magnetic resonance wireless energy transmission system based on symmetrically distributed emission array

Abstract

The invention, which relates to the technical field of wireless energy transmission, discloses a high-robustness magnetic resonance wireless energy transmission system based on a symmetrically distributed emission array, comprising a source coil array, an emission coil array, a receiving coil array and a dielectric substrate. The medium substrate comprises three layers, and the source coil array, the transmitting coil array and the receiving coil array are respectively printed on the three layers of medium substrates. The multi-layer arrangement of the source coil array nested inside and outside is utilized, magnetic resonance coupling and magnetic field focusing in the direction where the source coil array is located can be maximized, the magnetic field intensity is enhanced, a large-range uniform and stable magnetic field is obtained through dense arrangement of the coils in the transmitting coil array, each coil is additionally provided with resonant capacitance, and the magnetic field intensity is improved. And each sub-coil can resonate at the working frequency, so that the sub-coil can be coupled with a receiving coil more conveniently, and the transmission efficiency is further enhanced. The provided technology for improving the magnetic resonance wireless energy transmission robustness has a good effect.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless energy transmission, and in particular to a high-robustness magnetic resonance wireless energy transmission system based on a symmetrical distributed transmitting array. Background Art

[0002] Wireless energy transfer has garnered significant attention in recent years. Magnetic resonance wireless energy transfer (MCR-WPT) utilizes resonant coupling between coils to transmit energy, offering high power transmission efficiency over medium and long distances. Due to its portability, safety, and low cost, it is widely used in portable electronics, implantable medical devices, electric vehicles, robotic systems, and energy harvesting devices. However, the transmission efficiency of conventional MCR-WPT systems can be significantly reduced due to angular or lateral offsets between the transmitting and receiving coils. Conventional single rectangular / circular coils and bipolar coils can only provide high efficiency within a limited range and are unable to maintain efficient transmission over a wide range. When the transmitting and receiving coils are offset, the transmission efficiency drops significantly. Therefore, wireless energy transfer systems require methods that can withstand distance variations and lateral offsets. In summary, it is important to investigate methods that can improve the robustness of wireless energy transfer systems.

[0003] In order to solve the above problems, researchers have proposed many solutions. Some researchers have proposed the use of a switch transmitting array. The array consists of four rectangular coils distributed in the four corners. When the receiving coil is offset to the corresponding area, the corresponding rectangular coil will be turned on to enhance the transmission power. Other researchers have proposed the use of circuit compensation topology. By using non-resonant compensation methods, the compensation parameters of the relay coil and the receiving coil are optimized to reduce losses and improve efficiency. However, the above existing designs are large in size and the circuit topology is too complex, making the system more sensitive to parameter changes and difficult to implement. To this end, a technology for improving the robustness of magnetic resonance wireless energy transmission is proposed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to propose a technology suitable for improving the robustness of the magnetic resonance wireless energy transmission system, so as to achieve the purpose of reducing the decrease in transmission efficiency when the transmitting part and the receiving end are offset.

[0005] To achieve the above objectives, the present invention provides a highly robust magnetic resonance wireless energy transmission system based on a symmetrically distributed transmitting array, comprising: a source coil array, a transmitting coil array, a receiving coil array, and a dielectric substrate; the dielectric substrate comprises three layers, and the source coil array, the transmitting coil array, and the receiving coil array are printed on the three layers of the dielectric substrate respectively.

[0006] Preferably, the source coil array is printed on the first layer of the dielectric substrate; the transmitting coil array is printed on the second layer of the dielectric substrate; the source coil array and the transmitting coil array are closely stacked together to form a transmitting end; the source coil array transmits energy to the transmitting coil array through coupling.

[0007] Preferably, the source coil array is composed of three layers of coils nested inside and outside, and the three layers of coils of different types are wound in opposite directions to concentrate the magnetic field and achieve impedance matching.

[0008] Preferably, the transmitting coil array is formed by eight four-turn triangular coils arranged in a rotation around a center, and a high-intensity, wide-range stable magnetic field is formed by the close arrangement of the coils.

[0009] Preferably, the source coil array is composed of a first winding, a second winding, a third winding, a fourth winding and a first capacitor; one end of the first winding is used to weld an SMA interface, and the other end is connected to the second winding; the second winding is a single-turn rectangular coil, and in the outermost layer of the source coil array, one end of the second winding is connected to the first winding, and the other end is connected to the third winding. At the same time, the first capacitor is connected in the middle of the first winding by reverse winding; the third winding is a single-turn rectangular coil, and in the middle of the second winding and the fourth winding, one end of the third winding is connected to the second winding, and the other end is connected to the fourth winding, and the internal current direction is opposite to that of the second winding; the fourth winding is a single-turn circular coil, and in the center position of the array, the internal current direction is opposite to that of the third winding, and both ends of the fourth winding are connected to the third winding to form a closed loop; the first capacitor is welded at the middle interval position of the second winding, and the two ends of the first capacitor are respectively connected to the second winding and added to the closed loop.

[0010] Preferably, the transmitting coil array is composed of a first resonant unit, a second resonant unit, a third resonant unit, a fourth resonant unit, a fifth resonant unit, a sixth resonant unit, a seventh resonant unit, and an eighth resonant unit printed on the front surface of the second layer of the dielectric substrate, and a second resonant capacitor, a third resonant capacitor, a fourth resonant capacitor, a fifth resonant capacitor, a sixth resonant capacitor, a seventh resonant capacitor, an eighth resonant capacitor, and a ninth resonant capacitor printed on the back surface of the second layer of the dielectric substrate; wherein the first resonant unit is connected to the second resonant capacitor via a metal through-hole; the second resonant unit is connected to the third resonant capacitor via a metal through-hole; the third resonant unit is connected to the fourth resonant capacitor via a metal through-hole; the fourth resonant unit is connected to the fifth resonant capacitor via a metal through-hole; the fifth resonant unit is connected to the sixth resonant capacitor via a metal through-hole; the sixth resonant unit is connected to the seventh resonant capacitor via a metal through-hole; the seventh resonant unit is connected to the eighth resonant capacitor via a metal through-hole; and the eighth resonant unit is connected to the ninth resonant capacitor via a metal through-hole; and the resonant units do not contact each other and are arranged in a rotation around the center.

[0011] Preferably, the receiving coil array includes a receiving coil and a loading coil, which are printed on the third layer of the dielectric substrate to form a receiving end.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] This invention utilizes a multi-layered arrangement of source coils nested within and outside the source coil array to maximize magnetic resonance coupling and magnetic field focusing in that direction, enhancing magnetic field strength. The dense arrangement of coils within the transmitting coil array produces a uniform and stable magnetic field over a wide range. Furthermore, the added resonant capacitance of each coil ensures that each sub-coil resonates at the operating frequency, facilitating coupling with the receiving coil and further enhancing transmission efficiency. The proposed technology for enhancing the robustness of magnetic resonance wireless energy transmission has shown promising results. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 This is the overall structure of the technology for improving the robustness of the magnetic resonance wireless energy transmission system according to the embodiment of the present invention;

[0016] Figure 2 is a source coil array structure according to an embodiment of the present invention;

[0017] Figure 3 is a structural diagram of a transmitting coil array according to an embodiment of the present invention;

[0018] Figure 4 is a structural diagram of a receiving end according to an embodiment of the present invention;

[0019] Figure 5 is an S-parameter curve diagram of the wireless energy transmission system in an embodiment of the present invention;

[0020] Figure 6 is a graph showing how the transmission efficiency of the wireless energy transmission system in an embodiment of the present invention varies with the offset distance.

[0021] Explanation of the accompanying drawings: 1. first winding; 2. second winding; 3. third winding; 4. fourth winding; 5. first capacitor; 6. first resonant unit; 7. second resonant unit; 8. third resonant unit; 9. fourth resonant unit; 10. fifth resonant unit; 11. sixth resonant unit; 12. seventh resonant unit; 13. eighth resonant unit; 14. second resonant capacitor; 15. third resonant capacitor; 16. fourth resonant capacitor; 17. fifth resonant capacitor; 18. sixth resonant capacitor; 19. seventh resonant capacitor; 20. eighth resonant capacitor; 21. ninth resonant capacitor; 22. receiving coil; 23. tenth resonant capacitor; 24. fifth winding; 25. sixth winding. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1:

[0025] like Figure 1As shown, a highly robust magnetic resonance wireless energy transmission system based on a symmetrically distributed transmitting array provided by an embodiment of the present invention includes: a source coil array, a transmitting coil array, a receiving coil array, and a dielectric substrate. The source coil array is printed on the back of a first dielectric substrate, and the transmitting coil array is printed on the back of a second dielectric substrate. The front of the first dielectric substrate and the back of the second dielectric substrate are in contact and stacked together. The receiving coil array is printed on the back of a third dielectric substrate, and is separated from the second dielectric substrate by a certain distance. The source coil array is composed of two layers of rectangular coils and one layer of circular coils nested together. The currents of the coils in adjacent layers are in opposite directions, which helps to maximize magnetic resonance coupling and magnetic field focusing in their respective directions, thereby transmitting energy to the transmitting coil array through coupling. The transmitting coil array is composed of eight triangular coils arranged in a rotational manner, with each coil not contacting each other. This arrangement can form a uniform and stable magnetic field within the range of the transmitting coil array, and can still achieve high transmission efficiency when the receiving coil 22 is offset.

[0026] Furthermore, the transmitter consists of a source coil array and a transmitter coil array. The source coil array and the transmitter coil array are printed on two dielectric substrates, with the source coil array printed on the back of the first dielectric substrate and the transmitter coil array printed on the back of the second dielectric substrate. Connecting wires and resonant capacitors are printed on the front. The front of the first dielectric substrate and the back of the second dielectric substrate are superimposed together to facilitate coupling between the source coil array and the transmitter coil array.

[0027] Further, if Figure 2 As shown, the source coil array is printed on the first dielectric substrate and consists of a first winding 1, a second winding 2, a third winding 3, a fourth winding 4, and a first capacitor 5. One end of the first winding 1 is used for soldering an SMA connector, and the other end is connected to the second winding 2. The second winding 2 is a single-turn rectangular coil located at the outermost layer of the array, with one end connected to the first winding 1 and the other end to the third winding 3. Simultaneously, a first capacitor 5 is connected in the middle of the first winding 1 through reverse winding. The third winding 3 is a single-turn rectangular coil located between the second winding 2 and the fourth winding 4, with one end connected to the second winding 2 and the other end to the third winding 3. The internal current direction is opposite to that of the second winding 2. The fourth winding 4 is a single-turn circular coil located at the center of the array, with the internal current direction opposite to that of the third winding 3. Both ends are connected to the third winding 3 to form a closed loop. The first capacitor 5 is soldered to the middle of the second winding 2 at a spacing point, with both ends connected to the second winding 2. This closed loop allows the source coil array to resonate at the operating frequency. This nested arrangement helps maximize magnetic resonance coupling and magnetic field focusing in that direction, further enhancing magnetic field strength. The parasitic capacitance created by the gaps between the rectangular coils helps with impedance matching and ensures magnetic field stability.

[0028] Further, if Figure 3 As shown, the transmitting coil array is printed on the second layer of the dielectric substrate and consists of a first resonant unit 6, a second resonant unit 7, a third resonant unit 8, a fourth resonant unit 9, a fifth resonant unit 10, a sixth resonant unit 11, a seventh resonant unit 12, an eighth resonant unit 13, a second resonant capacitor 14, a third resonant capacitor 15, a fourth resonant capacitor 16, a fifth resonant capacitor 17, a sixth resonant capacitor 18, a seventh resonant capacitor 19, an eighth resonant capacitor 20, and a ninth resonant capacitor 21; wherein the first resonant unit 6 is connected to the second resonant capacitor 14 on the back through a metal through-hole; the second resonant unit 7 is connected to the second resonant capacitor 14 on the back through a metal through-hole; The third resonant capacitor 15 on the back is connected; the third resonant unit 8 is connected to the fourth resonant capacitor 16 on the back through a metal through-hole; the fourth resonant unit 9 is connected to the fifth resonant capacitor 17 on the back through a metal through-hole; the fifth resonant unit 10 is connected to the sixth resonant capacitor 18 on the back through a metal through-hole; the sixth resonant unit 11 is connected to the seventh resonant capacitor 19 on the back through a metal through-hole; the seventh resonant unit 12 is connected to the eighth resonant capacitor 20 on the back through a metal through-hole; and the eighth resonant unit 13 is connected to the ninth resonant capacitor 21 on the back through a metal through-hole. The resonant units do not touch each other and are arranged in a rotation around the center. The transmitting coil array composed of eight triangular coils can form a uniform and stable magnetic field over a large range. The close arrangement of the coils makes the magnetic field stronger, which helps to enhance the coupling with the receiving coil 22 and further improve the transmission efficiency.

[0029] Furthermore, the receiving coil array consists of a receiving coil 22, a loading coil, and a tenth resonant capacitor 23, printed on a third dielectric substrate. The receiving coil 22 comprises a four-turn rectangular coil connected to the tenth resonant capacitor 23 on the back surface via a metal via. The loading coil, located inside the receiving coil 22, consists of two windings. The ends of the fifth winding 24 are connected to the ends of the sixth winding 25. One end of the sixth winding 25 is connected to the fifth winding 24, and the other end is soldered to an SMA connector. Energy is transferred to the receiving end through coupling between the receiving coil 22 and the transmitting coil array, and then to the loading coil through coupling between the receiving coil 22 and the loading coil.

[0030] Further, if Figure 4 As shown, the receiving end consists of a receiving coil array printed on the back of the third dielectric substrate. During operation, the receiving and transmitting ends are spaced a certain distance apart, with air between them, and facing each other. The design of the source and receiving coil arrays creates a wide, stable magnetic field within the transmitting array. Even if the receiving end deviates during operation, transmission efficiency remains high.

[0031] In this embodiment, a highly robust magnetic resonance wireless energy transmission system based on a symmetrically distributed transmitting array is provided. Energy enters the source coil array through an interface. The source coil array, which is composed of two rectangular coils and a circular coil nested in each other, helps to maximize the magnetic field concentration in the direction of magnetic resonance coupling, enhance the magnetic field strength, and transmit energy to each sub-coil through coupling with each sub-coil in the transmitting coil array. The dense arrangement of the sub-coils of the transmitting coil array enables it to generate a uniform and stable magnetic field over a large range, which helps to couple with the receiving coil 22. Energy is transmitted to the receiving end through the coupling between the receiving coil 22 and each sub-coil of the transmitting coil array. Due to the design of the transmitting coil array, even if the receiving coil 22 is offset during use, the transmission efficiency can still be maintained at a relatively stable level.

[0032] Example 2:

[0033] The specific dimensions of the coils and dielectric substrates in the embodiment of the present invention are as follows: the first and second dielectric substrates are of the same size and thickness, with a length of 135 mm, a width of 135 mm, and a thickness of 0.5 mm; the source coil array is printed on the first dielectric substrate with a copper coating of 0.035 mm thickness, and the first winding 1 has a length of 5 mm and a width of 1 mm; the second winding 2 is a rectangular coil with an outer diameter of 58 mm, a width of 58 mm, and a strip width of 1.9 mm; the third winding 3 is a rectangular coil with an outer diameter of 51 mm, a width of 51 mm, and a strip width of 2.3 mm; the fourth winding 4 is a circular coil with an outer diameter of 22 mm and a strip width of 2 mm; the transmitting coil array is printed on the second dielectric substrate with a copper coating of 0.035 mm thickness, and the eight triangular sub-coils are exactly the same size and are arranged in rotation according to different rotation centers. The triangular coil body is an isosceles right triangle, and the isosceles right triangle coil The waist length is 60mm, the total number of turns is five, the strip width of the coil is 1.52mm, the turn spacing is 0.95mm, and the eight sub-coils are arranged in a rotational manner according to different rotation centers and connected to the resonant capacitor on the back through metal through-holes on the dielectric substrate. The receiving coil 22 is printed on the back of the third dielectric substrate. The third dielectric substrate is 72mm long, 72mm wide, and 0.5mm thick. The receiving coil 22 is a rectangular coil with four turns, the strip width and turn spacing are the same, the outer diameter of the coil is 70mm, the length and width are the same, the strip width is 2.1mm, the turn spacing is 1mm, and it is rotated in a rectangular shape and connected to the resonant capacitor on the back through metal through-holes on the dielectric substrate. The load coil is a single-turn rectangular coil composed of two windings. The fifth winding 24 is 22mm long, 22mm wide, and has a strip width of 1.8mm. The sixth winding 25 is 6mm long and has a strip width of 1.8mm.

[0034] The magnetic resonance wireless energy transmission system consists of a source coil array, a transmitting coil array, a receiving coil 22, and a load coil printed on a dielectric board made of FR4. The dielectric board has a thickness of 0.5 mm, a relative dielectric constant of 4.4, and a loss tangent of 0.02. The first capacitor 5 is a 10pF CC0805 series capacitor manufactured by Yageo Corporation. The second resonant capacitor 14, the third resonant capacitor 15, the fourth resonant capacitor 16, the fifth resonant capacitor 17, the sixth resonant capacitor 18, the seventh resonant capacitor 19, the eighth resonant capacitor 20, and the ninth resonant capacitor 21 are all 180pF GRM2165 series capacitors manufactured by Murata Corporation. The tenth resonant capacitor 23 is a 75pF CC0805 series capacitor manufactured by Yageo Corporation.

[0035] In summary, the present invention provides a highly robust magnetic resonance wireless energy transmission system based on a symmetrical distributed transmitting array, which is applied to the field of near-field wireless energy transmission. Figure 5 As shown in FIG. 1 , the return loss parameter S11 of the wireless energy transmission system provided by the present invention is less than 10 dB at 13.56 MHz, indicating that good impedance matching can be achieved at this frequency. Figure 6 As shown, the wireless energy transmission system provided by the present invention can achieve an efficiency of 88% when the transmitting and receiving coils are fully aligned, and can maintain an efficiency of 82% when the lateral offset distance reaches 50 mm.

[0036] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A highly robust magnetic resonance wireless energy transmission system based on a symmetrical distributed transmitting array, characterized in that: include: A source coil array, a transmitting coil array, a receiving coil array and a dielectric substrate; The dielectric substrate includes three layers, and the source coil array, the transmitting coil array, and the receiving coil array are printed on the three layers of the dielectric substrate respectively. The transmitting coil array is composed of eight four-turn triangular coils arranged in a rotation around a center. The close arrangement of the coils improves the robustness of the magnetic field distribution.

2. The highly robust magnetic resonance wireless energy transmission system based on a symmetrical distributed transmitting array according to claim 1, characterized in that: The source coil array is printed on the first layer of the dielectric substrate; the transmitting coil array is printed on the second layer of the dielectric substrate; the source coil array and the transmitting coil array constitute a transmitting end; the source coil array transmits energy to the transmitting coil array through coupling.

3. The highly robust magnetic resonance wireless energy transmission system based on a symmetrical distributed transmitting array according to claim 1, characterized in that: The source coil array is composed of three layers of coils nested inside and outside, and the three layers of coils of different types are wound in opposite directions to concentrate the magnetic field and achieve impedance matching.

4. The highly robust magnetic resonance wireless energy transmission system based on a symmetrical distributed transmitting array according to claim 1, characterized in that: The receiving coil array includes a receiving coil and a loading coil, which are printed on the third layer of the dielectric substrate to form a receiving end.

5. The highly robust magnetic resonance wireless energy transmission system based on a symmetrical distributed transmitting array according to claim 1, characterized in that: The source coil array consists of a first winding, a second winding, a third winding, a fourth winding and a first capacitor.

6. The highly robust magnetic resonance wireless energy transmission system based on a symmetrical distributed transmitting array according to claim 5, characterized in that: One end of the first winding is used to weld the SMA interface, and the other end is connected to the second winding; the second winding is a single-turn rectangular coil, and at the outermost layer of the source coil array, one end of the second winding is connected to the first winding, and the other end is connected to the third winding. At the same time, the first capacitor is connected in the middle of the first winding by reverse winding; the third winding is a single-turn rectangular coil, and in the middle of the second winding and the fourth winding, one end of the third winding is connected to the second winding, and the other end is connected to the fourth winding, and the internal current direction is opposite to that of the second winding; the fourth winding is a single-turn circular coil, and at the center position of the array, the internal current direction is opposite to that of the third winding, and both ends of the fourth winding are connected to the third winding to form a closed loop; the first capacitor is welded at the middle interval position of the second winding, and the two ends of the first capacitor are respectively connected to the second winding and added to the closed loop.

7. The highly robust magnetic resonance wireless energy transmission system based on a symmetrical distributed transmitting array according to claim 1, characterized in that: The transmitting coil array is composed of a first resonant unit, a second resonant unit, a third resonant unit, a fourth resonant unit, a fifth resonant unit, a sixth resonant unit, a seventh resonant unit, an eighth resonant unit, and a second resonant capacitor, a third resonant capacitor, a fourth resonant capacitor, a fifth resonant capacitor, a sixth resonant capacitor, a seventh resonant capacitor, an eighth resonant capacitor, and a ninth resonant capacitor.

8. The highly robust magnetic resonance wireless energy transmission system based on a symmetrical distributed transmitting array according to claim 7, characterized in that: The first resonant unit is connected to the second resonant capacitor through a metal through-hole; the second resonant unit is connected to the third resonant capacitor through a metal through-hole; the third resonant unit is connected to the fourth resonant capacitor through a metal through-hole; the fourth resonant unit is connected to the fifth resonant capacitor through a metal through-hole; the fifth resonant unit is connected to the sixth resonant capacitor through a metal through-hole; the sixth resonant unit is connected to the seventh resonant capacitor through a metal through-hole; the seventh resonant unit is connected to the eighth resonant capacitor through a metal through-hole; and the eighth resonant unit is connected to the ninth resonant capacitor through a metal through-hole.

9. The highly robust magnetic resonance wireless energy transmission system based on a symmetrical distributed transmitting array according to claim 8, characterized in that: The first resonance unit, the second resonance unit, the third resonance unit, the fourth resonance unit, the fifth resonance unit, the sixth resonance unit, the seventh resonance unit, and the eighth resonance unit do not contact each other and are arranged in a rotation around a center.

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