A wireless energy transmission system based on fano resonance effect

Abstract

The application relates to the field of wireless transmission, in particular to a wireless energy transmission system based on Fano resonance effect. The system comprises a constant voltage source, a driving control module, an improved Fano resonance module, a wireless transmission module, a receiving module and a transmission detection module. The improved Fano resonance module comprises a dielectric layer and a six-helix structure on the dielectric layer. The input end and the output end of the wireless transmission module are connected with the driving control module and the receiving module respectively. The wireless energy transmission system based on Fano resonance effect has the advantages of high transmission efficiency, high transmission stability, support for medium and short distance high-efficiency transmission, wide application prospect and market potential.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wireless transmission, in particular to a wireless energy transmission system based on Fano resonance effect. BACKGROUND

[0002] With the rapid development of science and technology, wireless energy transmission technology has become a popular research trend, which transmits energy from the transmitting end to the receiving end through electromagnetic waves or other wireless methods without physical cable connection, and has great development potential and application prospect. The common wireless energy transmission technologies at present mainly include electromagnetic induction type, magnetic resonance type, microwave type and radio frequency type, etc. However, the electromagnetic induction type wireless energy transmission has simple structure and low cost, but the transmission distance is very limited, and the energy can only be effectively transmitted within a few centimeters, which is difficult to meet the scene requirements of some long-distance energy transmission. Although the magnetic resonance type wireless energy transmission can improve the transmission distance to a certain extent, the transmission efficiency is greatly affected by the quality factor of the coil, the matching degree of the resonance frequency, and the relative position and angle between the coils, etc., and it is difficult to maintain stable and efficient transmission in practical application, and the complexity and cost of the system are also relatively high.

[0003] In recent years, Fano resonance effect has gradually attracted the attention of researchers and shown unique application potential in the fields of optics and electromagnetics. Fano resonance is a special resonance phenomenon produced by the interference between discrete states and continuous states, which has the characteristics of sharp asymmetric spectral lines and can realize resonance localization and enhancement effect of electromagnetic field in a specific frequency range. The existing technology still remains in the initial stage of introducing Fano resonance effect into wireless energy transmission system, and there are still problems such as low efficiency and poor stability in the combination of Fano resonance effect and the actual structure of wireless energy transmission system. SUMMARY

[0004] The purpose of the present application is to provide a wireless energy transmission system based on Fano resonance effect to solve the above technical problems.

[0005] To achieve the above purpose, the present application provides a wireless energy transmission system based on Fano resonance effect, which comprises a constant voltage source and a driving control module, the constant voltage source is electrically connected with the driving control module, further comprising a wireless transmission module provided with an improved Fano resonance module, the improved Fano resonance module comprises a dielectric layer and a six-spiral structure on the dielectric layer, the input end and the output end of the wireless transmission module are connected with the driving control module and the receiving module respectively, and the receiving module is connected with a transmission detection module.

[0006] Preferably, the driving control module is a full-bridge inverter circuit, which outputs high-frequency alternating signals for driving the wireless transmission module to transmit energy.

[0007] Preferably, the wireless transmission module comprises a primary PCB plate and a secondary PCB plate, and double-layer parallel spiral coils are embedded in the primary PCB plate and the secondary PCB plate, and the two double-layer parallel spiral coils are arranged in a concentric and opposite manner, for energy transmission and reception, to realize wireless energy transmission.

[0008] Preferably, the medium layer is hexagonal, and metal shielding layers are arranged on the upper and lower surfaces.

[0009] Preferably, the six-spiral structure comprises six metal strips, one end of each of the six metal strips is arranged at the center of the medium layer, the other end of each of the six metal strips is arranged opposite to a corner of the medium layer, the six metal strips are arranged in a spiral manner, the spacing of the metal strips is uniformly distributed, the line width of the six metal strips is the same, and the six-spiral structure is arranged opposite to the double-layer parallel spiral coils of the primary PCB plate.

[0010] Preferably, the receiving module is a rectification and filtering circuit, and the received electric energy is supplied to the load after rectification and filtering.

[0011] Preferably, the transmission detection module comprises an adjustable load, an oscilloscope and an efficiency calculation submodule; the oscilloscope is used to collect data of the receiving module and the adjustable load.

[0012] Transmission coefficient The calculation formula is as follows:

[0013] ;

[0014] Among them, is the angular frequency, is the Fano parameter used to reflect the amplitude ratio of the discrete state path and the continuous state path, is the resonance frequency, is the resonance line width;

[0015] System output power The formula is as follows:

[0016] ;

[0017] Among them, is the mutual inductance coefficient generated by the two double-layer parallel spiral coils, is the load resistance, and are the first resistance and the second resistance in the driving control module, is the voltage value of the constant voltage source, is the system output current;

[0018] Transmission efficiency The calculation formula is as follows:

[0019] ;

[0020] wherein, for transmission efficiency, for system input current.

[0021] Therefore, the application adopts the above-mentioned wireless energy transmission system based on Fano resonance effect, which has the beneficial effects of improving transmission efficiency and enhancing anti-interference by combining the wireless transmission module with the improved Fano resonance module. The improved Fano resonance module suppresses multipath reflection and electromagnetic interference of metal obstacles, thereby improving transmission stability.

[0022] The technical solutions of the application will be further described in detail below with reference to the drawings and embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 Fig. 1 is a structural schematic diagram of a wireless energy transmission system based on Fano resonance effect according to the application;

[0024] Figure 2 Fig. 2 is a structural schematic diagram of an improved Fano resonance module according to the application;

[0025] Figure 3 Fig. 3 is a principle diagram of a wireless transmission module according to the application.

[0026] REFERENCE NUMERALS

[0027] 1, constant voltage source; 2, driving control module; 3, improved Fano resonance module; 31, dielectric layer; 32, metal shielding layer; 33, six-spiral structure; 4, wireless transmission module; 41, primary PCB board; 42, secondary PCB board; 43, double-layer parallel spiral coil; 5, receiving module; 6, transmission detection module; 61, adjustable load; 62, oscilloscope; 63, efficiency calculation sub-module. DETAILED DESCRIPTION

[0028] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0030] like Figure 1 As shown, a wireless power transmission system based on the Fano resonance effect includes a constant voltage source 1, a drive control module 2, and a wireless transmission module 4. The constant voltage source 1, powered by a 12V DC power supply, provides power to the system. The constant voltage source 1 is electrically connected to the drive control module 2. The drive control module 2 is a full-bridge inverter circuit that outputs a high-frequency alternating signal to drive the wireless transmission module 4 for power transmission. The wireless transmission module 4 includes a primary PCB board 41 and a secondary PCB board 42. Both the primary and secondary PCB boards 41 and 42 have embedded double-layer parallel spiral coils. The outer diameter of the primary and secondary PCB boards 41 and 42 is designed to be 100mm. The double-layer parallel spiral coils have an outer diameter of 84mm, an inner diameter of 20mm, a thickness of 70μm, and a line width and spacing of 1mm. This system is used for energy transmission and reception, achieving wireless power transmission, which is accomplished through near-field magnetic coupling electromagnetic induction. The primary and secondary coils are arranged concentrically to form a superimposed magnetic field region to enhance energy receiving efficiency. The coil density is evenly distributed to reduce eddy current losses.

[0031] The wireless transmission module 4 includes an improved Fano resonance module 3, which comprises a dielectric layer 31 and a six-helix structure 33 on the dielectric layer 31, such as... Figure 2As shown, the medium layer 31 is hexagonal, and the six-helix structure 33 adopts a six-arm structure, which has higher symmetry (six-fold rotational symmetry) and more resonance paths than the four-arm structure. This complexity is more likely to excite multi-mode coupling, providing more potential discrete states for Fano resonance to interfere with the continuous states of the double coil system, resulting in sharper and stronger Fano resonance peaks. The six-arm symmetric design helps to produce a more uniform magnetic field distribution in the receiving coil plane, improving the stability of energy capture. The equivalent LC resonant cavity formed by the six-arm structure has a higher Q value (quality factor), meaning that energy is more concentrated around the resonance frequency, with lower loss. This complements the localization of Fano resonance, effectively confining electromagnetic field energy in the vicinity of the receiving coil, further improving transmission efficiency. If more coils are introduced, it may lead to over-coupling and energy dispersion, and too many discrete resonance modes will complicate the interference with the continuous states of the double coil, resulting in broadening and splitting of the Fano resonance peaks, reducing the strength and stability of the main peak. Electromagnetic fields may also be dispersed to too many resonance paths, weakening the energy localization at the receiving coil. In terms of processing technology, the tolerance of eight arms and above is lower, so the six-arm structure is the optimal structure.

[0032] The upper and lower surfaces of the medium layer 31 are provided with a metal shielding layer 32 (copper material) with a thickness of 1 ounce. In the PCB, 1 ounce means that the thickness of copper uniformly laid on an area of 1 square foot weighs 1 ounce. The average thickness of the copper foil is expressed in terms of weight per unit area. The medium layer 31 uses Rogers RO4000 series high-frequency circuit material with a dielectric constant of 3.48 and a thickness of 15 mm. The six-helix structure 33 includes six metal strips (copper material), which are spirally distributed outward from the center of the hexagonal medium layer at 0°, 60°, 120°, 180°, 240°, and 300°, respectively. Each of the six metal strips is wound 15 times, i.e., one end of each of the six metal strips is arranged at the center of the medium layer 31, and the other end of each of the six metal strips is arranged opposite to each of the six corners of the medium layer 31. The six metal strips are spirally arranged with uniform spacing between the metal strips, and the line width of the six metal strips is the same, i.e., 1.5 mm. The six-helix structure is arranged opposite to the double-layer parallel spiral coil. The input end and the output end of the wireless transmission module 4 are respectively connected to the driving control module 2 and the receiving module 5. The receiving module 5 is connected to the transmission detection module 6. The receiving module 5 is a rectifier filter circuit, and the received electric energy is supplied to the load after rectification and filtering.

[0033] Constant voltage source 1 provides driving control module 2 with 12V DC power source, driving control module 2 drives improved Fano resonance module 3 and the double-layer parallel spiral coil of primary PCB board 41 through outputting high-frequency alternating signals, when improved Fano resonance module 3 and the double-layer parallel spiral coil of primary PCB board 41 are together, interference phenomenon occurs between narrow-band resonance and wide-band spectrum, which improves the transmission efficiency of wireless power transmission, the double-layer parallel spiral coil of primary PCB board 41 and the double-layer parallel spiral coil of secondary PCB board 42 transmit wireless power to receiving module 5 through near magnetic field coupling, and receiving module 5 supplies power to the load through rectification and filtering.

[0034] In order to obtain the performance of wireless transmission, transmission detection module 6 is connected behind receiving module 5, transmission detection module 6 includes adjustable load 61, oscilloscope 62 and efficiency calculation sub-module 63; oscilloscope 62 is used to collect data of receiving module 5 and adjustable load 61. The adjustable load 61 of the embodiment is a sliding rheostat, which is modulated to 5Ω, 10Ω and 15Ω respectively, so as to facilitate observation of the change of coefficient output when the load changes. Oscilloscope 62 is used to detect the waveform, voltage and current of the system output, which is convenient for subsequent calculation of transmission efficiency.

[0035] According to Fano formula, transmission coefficient The calculation formula is as follows:

[0036] ;

[0037] Among them, is the angular frequency, Fano parameter is used to reflect the amplitude ratio of two paths (discrete state and continuous state), is the resonance frequency, is the resonance line width. Transmission coefficient is used to characterize the transmission efficiency.

[0038] The geometric parameters of six spiral coils directly affect the Fano resonance characteristics and system transmission efficiency. The number of turns of each arm spiral , the line width , the turn spacing need to meet the total length:

[0039] ;

[0040] Among them, is the spiral starting diameter, the designed mm in the embodiment, is the spiral turn index.

[0041] The inductance of six spiral coils The calculation formula is as follows:

[0042] ;

[0043] wherein, is the average diameter, is the vacuum permeability.

[0044] Resonant frequency of the coil and quality factor The calculation formula is as follows:

[0045] ;

[0046] ;

[0047] wherein, is the compensation capacitor set by the drive control circuit to make it resonate with the PCB coil, so that the circuit works normally, is the internal resistance.

[0048] From the above formula, the inductance is positively correlated with the number of turns. When the number of turns of the coil increases, the inductance will increase, which will reduce the resonant frequency and affect the value, and thus affect the system transmission efficiency.

[0049] At high frequencies, conductor loss is dominated by skin effect, and the conductor resistance is:

[0050] ;

[0051] wherein is the skin depth, is the resistivity, is the permeability, is the relative permeability, and for non-ferromagnetic metals . It can be seen that the resistance is negatively correlated with the line width. When the line width increases, it will cause the conductor resistance to decrease. Too wide line width will increase the parasitic capacitance, causing the resonant frequency to deviate.

[0052] As shown in Figure 3 , the double-layer parallel spiral coils arranged in the primary PCB board 41 and the secondary PCB board 42 are respectively the transmitting coil and the receiving coil , and the transmitting coil and the receiving coil produce mutual inductance M, and the compensation capacitors between the transmitting coil and the receiving coil are and When the power supply is powered, a voltage will be generated on the receiving side to the transmitting coil, and the transmitting coil will also have a corresponding voltage acting on the receiving coil.

[0053] Based on the Kirchhoff voltage law, the equation set is written as follows to establish the input and output voltage and current relationship:

[0054] ;

[0055] ;

[0056] ;

[0057] wherein, and are the primary loop impedance and the secondary loop impedance respectively, , and are the resistance, inductance and capacitance of the primary loop respectively, is the imaginary unit; , and are the resistance, inductance and capacitance in the secondary loop respectively;

[0058] and are the system input current and output current respectively, is the system input voltage.

[0059] The system output power is calculated as follows:

[0060] ;

[0061] wherein, is the mutual inductance coefficient generated by the two double-layer parallel spiral coils, is the load resistance, and are the first resistance and the second resistance in the driving control module respectively, is the voltage value of the constant voltage source.

[0062] The transmission efficiency is calculated as follows:

[0063] ;

[0064] wherein, is the transmission efficiency.

[0065] The technical scheme of the embodiment has the Fano resonance module with six spiral coils, the energy transmission efficiency is improved to more than 85% (the traditional system is about 60%-70%), and the anti-interference is enhanced, the Fano resonance structure suppresses the multipath reflection and the electromagnetic interference of the metal obstacle, and the transmission stability is improved by about 40%. And support high-efficiency transmission in medium and short distances (0.5-2 meters), suitable for power supply of Internet of Things devices and mobile terminals in complex environments, and has broad application prospect and market potential.

[0066] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application but not to limit it, although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that: it can still modify or equivalently replace the technical solutions of the present application, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present application.

Claims

1. A wireless energy transmission system based on Fano resonance effect, comprising a constant voltage source and a driving control module, the constant voltage source being electrically connected with the driving control module, characterized in that: It also includes a wireless transmission module with an improved Fano resonance module. The improved Fano resonance module includes a dielectric layer and a six-helix structure on the dielectric layer. The input and output terminals of the wireless transmission module are respectively connected to the drive control module and the receiving module. The receiving module is connected to the transmission detection module. The dielectric layer is hexagonal; The six-helix structure consists of six metal strips, one end of which is located at the center of the dielectric layer, and the other end of which is located opposite the six corners of the dielectric layer. Each metal strip is wound 15 times.

2. The wireless energy transfer system based on Fano resonance effect of claim 1, wherein: The drive control module is a full-bridge inverter circuit. The full-bridge inverter circuit outputs a high-frequency alternating signal, which is used to drive the wireless transmission module for energy transmission.

3. The wireless energy transfer system based on Fano resonance effects of claim 2, wherein: The wireless transmission module includes a primary PCB board and a secondary PCB board. Both the primary and secondary PCB boards are embedded with double-layer parallel spiral coils, which are arranged concentrically opposite each other for energy transmission and reception, thereby realizing wireless energy transmission.

4. The wireless energy transfer system based on Fano resonance effects of claim 3, wherein: Metal shielding layers are provided on the top and bottom surfaces.

5. The wireless energy transfer system based on Fano resonance effects of claim 4, wherein: The six metal strips are spirally arranged with uniform spacing and the same line width. The six spiral structures are arranged opposite to the double-layer parallel spiral coils on the original PCB board.

6. The wireless energy transfer system based on Fano resonance effects of claim 5, wherein: The receiving module is a rectifier and filter circuit. The received electrical energy is rectified and filtered before being supplied to the load.

7. A wireless power transmission system based on the Fano resonance effect according to claim 6, characterized in that: The transmission detection module includes an adjustable load, an oscilloscope, and an efficiency calculation submodule; the oscilloscope is used to acquire data from the receiving module and the adjustable load. Transmission coefficient The calculation formula is as follows: in, Angular frequency, The Fano parameter is used to reflect the amplitude ratio of the discrete-state path and the continuous-state path. The resonant frequency, The resonant linewidth; System output power The formula is as follows: in, The mutual inductance coefficient generated by two double-layer parallel helical coils. For load resistance, and Divided into the first resistor and the second resistor in the drive control module, This is the voltage value of the constant voltage source. For system output current; Transmission efficiency The calculation formula is as follows: in, For transmission efficiency, Input current to the system.

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