Wireless energy transmission system based on Fano resonance effect

Abstract

The invention relates to the field of wireless transmission, in particular to a wireless energy transmission system based on a 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-spiral structure on the dielectric layer, and the input end and the output end of the wireless transmission module are connected with the driving control module and the receiving module respectively. By adopting the wireless energy transmission system based on the Fano resonance effect, the transmission efficiency is improved, the Fano resonance module is improved, the electromagnetic interference of multi-path reflection and metal obstacles is inhibited, the transmission stability is improved, medium and short distance efficient transmission is supported, and the wireless energy transmission system is suitable for power supply of Internet of Things equipment and a mobile terminal in a complex environment; wide application prospects and market potentials are realized.

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 coil 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. Transmission coefficient The calculation formula is as follows: ; Wherein, 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; System output power The formula is as follows: ; 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, is the voltage value of the constant voltage source, is the system output current; Transmission efficiency The calculation formula is as follows: ; Wherein, is the transmission efficiency, is the system input current.

[0012] Therefore, the application adopts the above-mentioned wireless energy transmission system based on Fano resonance effect, has the beneficial effects that: through the wireless transmission module combined with the improved Fano resonance module, the transmission efficiency is improved, and the anti-interference is enhanced, the improved Fano resonance module suppresses the multipath reflection and the electromagnetic interference of metal obstacles, and the transmission stability is improved.

[0013] The technical solutions of the application are described in further detail below with reference to the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 Fig. 1 is a structural schematic diagram of the wireless energy transmission system based on Fano resonance effect of the application; Figure 2 Fig. 2 is a structural schematic diagram of the improved Fano resonance module; Figure 3 Fig. 3 is a principle diagram of the wireless transmission module of the application.

[0015] REFERENCE NUMERALS 1, constant voltage source; 2, driving control module; 3, improved Fano resonance module; 31, dielectric layer; 32, metal shielding layer; 33, six helix structure; 4, wireless transmission module; 41, primary PCB board; 42, secondary PCB board; 43, double-layer parallel helical coil; 5, receiving module; 6, transmission detection module; 61, adjustable load; 62, oscilloscope; 63, efficiency calculation submodule. DETAILED DESCRIPTION

[0016] In the description of the application, it should be noted that the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the application is used, and are only for the convenience of describing the application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. In the description of the application, it should be noted that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be connected inside two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the application can be understood according to the specific circumstances.

[0017] The embodiments of the application are described in detail below with reference to the drawings.

[0018] As Figure 1As shown, a wireless energy transmission system based on 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 at the front end is used to supply energy to the system, and a 12V DC power supply is adopted. The constant voltage source 1 is electrically connected with the drive control module 2. The drive control module 2 is a full-bridge inverter circuit, which outputs a high-frequency alternating signal for driving the wireless transmission module 4 to transmit energy. The wireless transmission module 4 includes a primary PCB board 41 and a secondary PCB board 42, and double-layer parallel spiral coils are embedded in the primary PCB board 41 and the secondary PCB board 42. The outer diameter of the primary PCB board 41 and the secondary PCB board 42 is designed as 100mm, the double-layer parallel spiral coil is designed with an outer diameter of 84mm, an inner diameter of 20mm, a thickness of 70μm, and a line width and a spacing of 1mm. The wireless energy transmission is realized by energy emission and reception, and the energy transmission is completed by receiving near-field magnetic coupling electromagnetic induction. The primary coil and the secondary coil are arranged concentrically to form a superimposed magnetic field region to enhance the energy receiving efficiency, and the coil density is uniformly distributed to reduce eddy current loss.

[0019] An improved Fano resonance module 3 is arranged in the wireless transmission module 4. The improved Fano resonance module 3 includes a dielectric layer 31 and a six-spiral structure 33 on the dielectric layer 31, as shown in Figure 2 The dielectric layer 31 is a hexagon, and the six-spiral structure 33 adopts a six-arm structure, which has higher symmetry (six-fold rotational symmetry) and more resonance paths than a 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 state of the double-coil system, resulting in a sharper and stronger Fano resonance peak. 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, which can more effectively confine electromagnetic field energy in the vicinity of the receiving coil, thereby further improving transmission efficiency. If more coils are introduced, it may cause over-coupling and energy dispersion. Too many discrete resonance modes will complicate the interference with the continuous state of the double-coil, resulting in Fano resonance peak broadening and splitting, reducing the strength and stability of the main peak. Electromagnetic field may also be dispersed to too many resonance paths, weakening the energy localization at the receiving coil. In terms of processing technology, the precision requirements of line width and spacing increase dramatically, and the tolerance of eight arms and above is lower, so the six-arm structure is the optimal structure.

[0020] The medium layer 31 is provided with a metal shielding layer 32 (copper material) on the upper and lower surfaces, and the thickness is 1 ounce. In the PCB, 1 ounce means that the thickness of the copper uniformly laid on the area of 1 square foot is 1 ounce. The average thickness of the copper foil is expressed by the weight per unit area. The dielectric constant of the medium layer 31 is 3.48, and the high-frequency circuit material of the Rogers RO4000 series is used, and the thickness is 15 mm. The six spiral structure 33 includes six metal strips (copper material), and the six metal strips 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 for 15 turns, that is, one end of the six metal strips is arranged at the center of the medium layer 31, and the other end of the six metal strips is arranged opposite to the six corners of the medium layer 31, respectively. The six metal strips are spirally arranged, and the spacing of the metal strips is uniformly distributed. The line width of the six metal strips is the same, and the line width and the spacing are both 1.5 mm. The six spiral 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 with the driving control module 2 and the receiving module 5. The receiving module 5 is connected with 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.

[0021] The constant voltage source 1 supplies the driving control module 2 with a 12V direct current source. The driving control module 2 drives the improved Fano resonance module 3 and the double-layer parallel spiral coil of the primary PCB board 41 by outputting a high-frequency alternating signal. When the improved Fano resonance module 3 and the double-layer parallel spiral coil of the primary PCB board 41 are together, the interference phenomenon occurs between the narrow-band resonance and the wide-band spectrum line, which improves the transmission efficiency of the wireless electric energy transmission. The double-layer parallel spiral coil of the primary PCB board 41 and the double-layer parallel spiral coil of the secondary PCB board 42 transmit wireless electric energy to the receiving module 5 through near magnetic field coupling. The receiving module 5 supplies power to the load through rectification and filtering.

[0022] In order to obtain the performance of wireless transmission, the receiving module 5 is connected with the transmission detection module 6. The transmission detection module 6 includes an adjustable load 61, an oscilloscope 62 and an efficiency calculation sub-module 63. The oscilloscope 62 is used to collect data of the receiving module 5 and the adjustable load 61. The adjustable load 61 of the embodiment is a sliding rheostat. The sliding rheostat is modulated to 5Ω, 10Ω and 15Ω, respectively, which is convenient for observing the change of the coefficient output when the load changes. The oscilloscope 62 is used to detect the waveform, voltage and current of the system output, which is convenient for subsequent calculation of the transmission efficiency.

[0023] According to the Fano formula, the transmission coefficient The calculation formula is as follows: ; Among them, is the angular frequency, Fano parameter is used to reflect the amplitude ratio of two paths (discrete state and continuous state), resonant frequency, resonant line width. Transmission coefficient is used to characterize the transmission efficiency.

[0024] The geometric parameters of the six spiral coils directly affect the Fano resonance characteristics and the system transmission efficiency. The number of turns of each arm , line width , turn spacing The total length needs to meet: ; Where, is the starting diameter of the spiral, the designed mm, is the turn index of the spiral.

[0025] The inductance of the six spiral coils The calculation formula is as follows: ; Where, is the average diameter, is the vacuum permeability.

[0026] The resonant frequency of the coil and the quality factor The calculation formula is as follows: ; ; Where, 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.

[0027] From the above formula, the inductance and the number of turns are positively correlated. When the number of turns of the coil increases, the inductance will increase, which will cause the resonant frequency to decrease and will affect the value, and in turn will affect the system transmission efficiency.

[0028] At high frequencies, the conductor loss is dominated by the skin effect, and the conductor resistance is: ; Where 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 and line width are negatively correlated. When the line width increases, the conductor resistance decreases. Overly wide line width will increase the parasitic capacitance, causing the resonance frequency to shift.

[0029] 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 a transmitting coil and a receiving coil , mutual inductance M is generated between the transmitting coil and the receiving coil , and the compensation capacitances between the transmitting coil and the receiving coil are and respectively. When the power supply is powered, a voltage is generated to the transmitting coil on the receiving side, and the transmitting coil also has a corresponding voltage acting on the receiving coil.

[0030] Based on Kirchhoff's voltage law, the equation group is established to establish the input and output voltage and current relationship as follows: ; ; ; Among them, 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; and are the system input current and output current respectively, is the system input voltage.

[0031] The system output power is calculated as follows: ; 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 respectively, is the voltage value of the constant voltage source.

[0032] The transmission efficiency is calculated as follows: ; wherein, for transmission efficiency.

[0033] The technical scheme of the embodiment improves the energy transmission efficiency to more than 85% (about 60%-70% in traditional systems) by using the Fano resonance module with six spiral coils, and enhances the anti-interference, the Fano resonance structure of which suppresses the multipath reflection and electromagnetic interference of metal obstacles, and the transmission stability is improved by about 40%. And it supports high-efficiency transmission in medium and short distances (0.5-2 meters), and is suitable for power supply of Internet of Things devices and mobile terminals in complex environments, and has broad application prospects and market potential.

[0034] 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: the technical solutions of the present application can still be modified or replaced by equivalents, 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 the Fano resonance effect, comprising a constant voltage source and a drive control module, wherein the constant voltage source and the drive control module are electrically connected, and characterized in that: It also includes a wireless transmission module equipped 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 ends 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.

2. The wireless energy transmission system based on the Fano resonance effect according to claim 1, characterized in that: The drive control module is a full-bridge inverter circuit, which outputs a high-frequency alternating signal for driving the wireless transmission module to transmit energy.

3. The wireless energy transmission system based on the Fano resonance effect according to claim 2, characterized in that: The wireless transmission module includes a primary PCB board and a secondary PCB board. Both the primary PCB board and the secondary PCB board are embedded with double-layer parallel spiral coils, and the two double-layer parallel spiral coils are concentrically arranged opposite each other for energy transmission and reception to achieve wireless energy transmission.

4. The wireless energy transmission system based on the Fano resonance effect according to claim 3, characterized in that: The dielectric layer is hexagonal and has metal shielding layers on the upper and lower surfaces.

5. The wireless energy transmission system based on the Fano resonance effect according to claim 4, characterized in that: The six-helix structure includes six metal strips, one end of each of which is set at the center of the dielectric layer, and the other ends of the six metal strips are respectively set opposite to the six corners of the dielectric layer. The six metal strips are set in a spiral and the spacing between the metal strips is evenly distributed. The line width of the six metal strips is the same. The six-helix structure is set opposite to the double-layer parallel spiral coil of the primary PCB board.

6. The wireless energy transmission system based on Fano resonance effect according to claim 5, characterized in that: The receiving module is a rectifier and filter circuit, which supplies power to the load after receiving the electric energy through rectification and filtering.

7. The wireless energy 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 collect data from the receiving module and the adjustable load; Transmission coefficient The calculation formula is as follows: ； in, is the angular frequency, The Fano parameter is used to reflect the amplitude ratio of the discrete state path and the continuous state path. is the resonant frequency, is the resonance linewidth; System output power The formula is as follows: ； in, is the mutual inductance coefficient generated by two double-layer parallel spiral coils, is the load resistance, and Divided into the first resistor and the second resistor in the drive control module, is the voltage value of the constant voltage source, is the system output current; Transmission efficiency The calculation formula is as follows: ； in, For transmission efficiency, Input current to the system.

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