Multi-coil wireless energy transmission system, design method, equipment and storage medium

Abstract

The invention provides a multi-coil wireless energy transmission system, a design method, equipment and a storage medium. The multi-coil wireless energy transmission system comprises an inverter circuit, a rectifying circuit and a plurality of coils, the plurality of coils comprise a transmitting coil, a receiving coil and a plurality of repeating coils which are arranged according to optimized intervals and a preset sequence, the optimized intervals of two adjacent coils in the plurality of coils are different, and the interval of the two adjacent coils is determined based on an external load; the transmitting coil is connected with the inverter circuit, and the receiving coil is connected with the rectifier circuit. According to the multi-coil wireless energy transmission system, the multiple coils can be arranged according to the optimized intervals, the intervals of every two adjacent coils in the multiple coils are different after optimization, the transmission distance and efficiency of the multi-coil wireless energy transmission system under different loads can be improved, and the power supply problem of high-potential online monitoring equipment is effectively solved.

Description

Technical Field

[0001] The present invention relates to the field of wireless power transmission technology, and in particular to a multi-coil wireless power transmission system, a design method, a device and a storage medium. Background Art

[0002] High-voltage transmission lines are usually directly exposed in the wild and are easily damaged. In order to promptly detect potential safety hazards, more and more online monitoring devices are being used to monitor the working conditions of high-voltage transmission lines. Existing power supply usually uses current transformers, solar photovoltaic panels and lithium batteries for energy storage, which are subject to unstable power supply due to factors such as unstable line flow, uncertain weather and limited lithium battery capacity.

[0003] Wireless power transmission technology uses electromagnetic fields to transmit energy, and has the advantages of safety, reliability, and isolation. However, the efficiency of wireless power transmission systems decreases rapidly with increasing distance, and how to achieve efficient wireless power transmission has become a hot and difficult issue in research. Summary of the invention

[0004] In order to solve the problem of how to achieve efficient wireless power transmission in the prior art, the present invention proposes a multi-coil wireless power transmission system, including: an inverter circuit, a rectifier circuit and multiple coils;

[0005] The multiple coils include a transmitting coil, a receiving coil and a plurality of relay coils arranged according to an optimized spacing and a preset order, wherein the optimized spacings of two adjacent coils in the multiple coils are different, and the spacings of the two adjacent coils are determined based on an external load; the transmitting coil is connected to the inverter circuit, and the receiving coil is connected to the rectifier circuit;

[0006] The inverter circuit converts the current input into the multi-coil wireless energy transmission system into alternating current, transmits the alternating current to the multiple relay coils through the transmitting coil, transmits the alternating current to the receiving coil through the multiple relay coils, and the receiving coil inputs the alternating current into the rectifier circuit, which converts the alternating current into new direct current to supply power to an external load.

[0007] Optionally, the diameter of each coil in the plurality of coils is less than or equal to a preset diameter threshold, and each coil is a three-dimensional solenoid coil, and the three-dimensional solenoid coil comprises a hollow solenoid Litz coil on the outer layer of the coil and an ultra-thin magnetic conductive body portion of the coil split longitudinally;

[0008] The ultra-thin magnetic conductive part of the coil is embedded in the hollow solenoid Litz coil, and the thickness of the ultra-thin magnetic conductive part of the coil is less than or equal to a preset thickness threshold.

[0009] Optionally, the reactive power compensation of each coil is compensated by connecting a compensation capacitor and a parasitic resistor in series.

[0010] Optionally, the inverter circuit includes a first MOS tube, a second MOS tube, a third MOS tube, a fourth MOS tube, a common mode inductor and a filter branch, the filter branch includes a plurality of capacitors connected in parallel, and the parasitic resistance of the first MOS tube, the second MOS tube, the third MOS tube and the fourth MOS tube is 0.15Ω;

[0011] The first MOS tube and the third MOS tube are connected in series to form a first bridge arm, the second MOS tube and the fourth MOS tube are connected in series to form a second bridge arm, and the first bridge arm and the second bridge arm are connected in parallel to form a full-bridge inverter;

[0012] The full-bridge inverter is connected to the common-mode inductor through the filter branch.

[0013] Optionally, the rectifier circuit includes a first diode, a second diode, a third diode and a fourth diode, and the first diode, the second diode, the third diode and the fourth diode are all common cathode Schottky diodes with a conduction voltage drop of 0.86V;

[0014] The first diode and the third diode are connected in series to form a third bridge arm, the second diode and the fourth diode are connected in series to form a fourth bridge arm, and the third bridge arm and the fourth bridge arm are connected in parallel.

[0015] Based on the same inventive concept, the present invention also proposes a design method for a multi-coil wireless energy transmission system, the method comprising:

[0016] Based on the topological structure of the multi-coil wireless energy transmission system, an equivalent circuit model of the multi-coil wireless energy transmission system is established;

[0017] Determine an optimized spacing between two adjacent coils among the multiple coils based on an equivalent circuit model, an objective function, constraints and an optimization algorithm of the multi-coil wireless energy transmission system;

[0018] Based on the optimized spacing and the design parameters of each coil, the multi-coil wireless energy transmission system is constructed.

[0019] Optionally, determining the optimized spacing between two adjacent coils among the multiple coils based on an equivalent circuit model, an objective function, a constraint condition and an optimization algorithm of the multi-coil wireless energy transmission system includes:

[0020] Based on the equivalent circuit model of the multi-coil wireless energy transmission system, constructing a loop equation of the multi-coil wireless energy transmission system;

[0021] Solving the loop equation to obtain output current and AC input voltage expressions and current recursive expressions, wherein the output current is the output current of the multi-coil wireless energy transmission system, and the AC input voltage is the AC input voltage of the magnetic coupling mechanism;

[0022] Based on the current recursive expression and the mutual inductance values ​​of the coils at different spacings, a curve of the relationship between the output current and the coil spacing is obtained by fitting;

[0023] Based on the constraint conditions, the output current and coil spacing relationship curve and the output current and AC input voltage expression, the objective function is maximized to obtain the optimized spacing between two adjacent coils in the multiple coils.

[0024] Optionally, constructing a loop equation of the multi-coil wireless energy transmission system based on an equivalent circuit model of the multi-coil wireless energy transmission system includes:

[0025] The loop equation is constructed based on the output current, compensation capacitance, self-inductance parameter and parasitic resistance of each coil in the equivalent circuit model, the mutual inductance parameter of any two coils among the multiple coils and the AC voltage of the input magnetic coupling mechanism of the full-bridge inverter.

[0026] Optionally, before determining the optimized spacing between two adjacent coils among the multiple coils based on the equivalent circuit model, objective function, constraint conditions and optimization algorithm of the multi-coil wireless energy transmission system, the method further includes:

[0027] Determining the objective function based on the equivalent resistance of the rectifier circuit and the subsequent circuit of the rectifier circuit, the output current and the parasitic resistance of each coil in the plurality of coils;

[0028] Determining the constraint condition based on an equivalent resistance of a full-bridge rectifier and a subsequent circuit of the full-bridge rectifier, and a distance between two adjacent coils among a plurality of coils;

[0029] The objective function satisfies the following formula:

[0030]

[0031] The constraints satisfy the following formula:

[0032]

[0033] Where η is the system efficiency, I i is the output current of the ith coil, I n is the output current of the nth coil, R i is the parasitic resistance of the ith coil, R eqis the equivalent resistance of the rectifier circuit and the subsequent circuit of the rectifier circuit, d1 is the distance between the first coil and the second coil, d n-1 is the distance from the n-1th coil to the nth coil, d total is the transmission distance of the multi-coil wireless energy transmission system, R given is a given equivalent resistance value.

[0034] Optionally, after determining the optimized spacing between two adjacent coils among the multiple coils based on the equivalent circuit model, objective function, constraint conditions and optimization algorithm of the multi-coil wireless energy transmission system, the method further includes:

[0035] Performing circuit simulation on the optimized spacing to obtain optimized system efficiency;

[0036] When the optimized system efficiency is less than or equal to the system efficiency before optimization, the spacing between two adjacent coils in the multiple coils is re-optimized, wherein the system efficiency before optimization is the efficiency of the multi-coil wireless energy transmission system when the multiple coils are arranged in an equal spacing manner.

[0037] Based on the same inventive concept, the present invention also provides an electronic device, comprising: one or more processors;

[0038] The processor is used to store one or more programs;

[0039] When the one or more programs are executed by the one or more processors, the above-mentioned design method of the multi-coil wireless energy transmission system is implemented.

[0040] Based on the same inventive concept, the present invention also proposes a computer-readable storage medium on which a computer program is stored. When the computer program is executed, the design method of the multi-coil wireless energy transmission system described above is implemented.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] The present invention provides a multi-coil wireless energy transmission system, comprising: an inverter circuit, a rectifier circuit and a plurality of coils; the plurality of coils comprises a transmitting coil, a receiving coil and a plurality of relay coils arranged according to an optimized spacing and a preset order, the optimized spacing between two adjacent coils in the plurality of coils is different, and the spacing between two adjacent coils is determined based on an external load; the transmitting coil is connected to the inverter circuit, and the receiving coil is connected to the rectifier circuit; the inverter circuit converts the current input into the multi-coil wireless energy transmission system into alternating current, transmits the alternating current to the plurality of relay coils through the transmitting coil, transmits the alternating current to the receiving coil through the plurality of relay coils, the receiving coil inputs the alternating current into the rectifier circuit, and the rectifier circuit converts the alternating current into a new direct current to supply power to the external load. The plurality of coils can be arranged according to the optimized spacing, and the optimized spacing between two adjacent coils in the plurality of coils is different, so that the transmission distance and efficiency of the multi-coil wireless energy transmission system under different loads can be improved, and the power supply problem of high-voltage online monitoring equipment can be effectively solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A topological structure diagram of a multi-coil wireless energy transmission system provided by the present invention;

[0044] Figure 2 A schematic diagram of the structure of another multi-coil wireless energy transmission system provided by the present invention;

[0045] Figure 3 A schematic diagram of the arrangement of five coils provided by the present invention;

[0046] Figure 4 A schematic diagram of a simulation circuit provided by the present invention;

[0047] Figure 5 A schematic diagram of a system equidistant simulation result provided by the present invention (the load is 40Ω);

[0048] Figure 6 A schematic diagram of a system optimization spacing simulation result provided by the present invention (the load is 40Ω);

[0049] Figure 7 A schematic diagram of another system equidistant simulation result provided by the present invention (load is 80Ω);

[0050] Figure 8 Schematic diagram of another system optimization spacing simulation result provided by the present invention (load is 80Ω)

[0051] Fig. 9 A schematic structural diagram of a three-dimensional solenoid coil provided by the present invention;

[0052] Fig.10A schematic diagram of the structure of a hollow solenoid Litz coil provided by the present invention;

[0053] Fig.11 A schematic diagram of the structure of a longitudinally split ultra-thin magnetic conductive part of a coil provided by the present invention;

[0054] Fig.12 A schematic diagram of a three-dimensional solenoid magnetic coupling structure based on an ultra-thin planar magnetic core provided by the present invention;

[0055] Fig.13 A schematic diagram of an inverter circuit provided by the present invention;

[0056] Fig.14 A schematic diagram of a PWM generation circuit provided by the present invention;

[0057] Fig.15 A schematic diagram of an inverter circuit provided by the present invention;

[0058] Fig.16 A flow chart of a design method for a multi-coil wireless energy transmission system provided by the present invention;

[0059] Fig.17 A schematic diagram of an equivalent circuit model of a multi-coil wireless energy transmission system provided by the present invention;

[0060] Fig.18 A flow chart of a design method for a multi-coil wireless energy transmission system provided by the present invention;

[0061] Fig.19 A schematic diagram of an electronic device provided by the present invention. DETAILED DESCRIPTION

[0062] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0063] Embodiment 1:

[0064] Figure 1 A topological structure diagram of a multi-coil wireless energy transmission system provided by the present invention, such as Figure 1As shown, the multi-coil wireless energy transmission system may include: an inverter circuit 101, a rectifier circuit 102 and multiple coils; the multiple coils may include a transmitting coil 103, a receiving coil 104 and multiple relay coils 105 arranged according to an optimized spacing and a preset order, and the optimized spacings of two adjacent coils in the multiple coils are different, and the spacings of the two adjacent coils are determined based on an external load; the transmitting coil may be connected to the inverter circuit, and the receiving coil may be connected to the rectifier circuit; the inverter circuit 101 may convert the current input into the multi-coil wireless energy transmission system into alternating current, transmit the alternating current to the multiple relay coils 105 through the transmitting coil 103, transmit the alternating current to the receiving coil through the multiple relay coils 105, and the receiving coil 104 inputs the alternating current into the rectifier circuit 102, and the rectifier circuit 102 converts the alternating current into new direct current to supply power to the external load.

[0065] Wherein, the reactive power compensation of each coil is compensated by connecting in series with a compensation capacitor and a parasitic resistance. By means of series compensation, different transformation ratios can be obtained by changing the position of the coil, which can reduce the loss of components and improve system efficiency. The multi-coil wireless energy transmission system can be embedded in a high-voltage insulating pillar to play an insulating and isolating role to ensure that the multi-coil wireless energy transmission system (high-voltage transmission line) and the monitoring equipment are at the same potential on the high-voltage side. The inverter circuit 101 may include a power access terminal, which can be used to connect an external DC power supply, and the rectifier circuit 102 can be used to connect an external load. When the inverter circuit 101 receives direct current power input from an external direct current power supply, it obtains alternating current power by inverting the input direct current power, and transmits the alternating current power to the relay coil 105 adjacent to the transmitting coil 103 through the transmitting coil 103. The multiple relay coils 105 can be used to transmit the alternating current power to the receiving coil 104, so that when the receiving coil 104 receives the alternating current power, it can input the alternating current power into the rectifier circuit 102. The rectifier circuit 102 obtains new direct current power after rectifying the alternating current power, and supplies power to the external load.

[0066] It should be noted that the front and back stages of the multi-coil wireless energy transmission system need to design corresponding converters. The front stage adopts a full-bridge inverter topology. In order to reduce the loss of switching devices, a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) with a parasitic resistance of 0.15Ω and a model IRF640NPBF is used, and common-mode inductance and capacitor filtering are added after the DC power supply to reduce ripple interference; the back stage of the system adopts a full-bridge uncontrolled rectifier topology. In order to reduce the loss of switching devices and maintain a large conduction current capability, a common cathode Schottky diode with a conduction voltage drop of 0.86V and a model MBR40200WT is used.

[0067] In order to solve the problems existing in the power supply mode of online monitoring equipment in the current power grid, the present invention adopts a multi-coil wireless energy transmission system to power the high-voltage transmission line monitoring equipment, designs a constant voltage compensation topology, and at the same time, the design method of the multi-coil wireless energy transmission system optimizes the coil spacing and the arrangement position of the coil, which greatly improves the transmission distance and efficiency of the multi-coil wireless energy transmission system and effectively solves the power supply problem of high-potential online monitoring equipment.

[0068] For example, Figure 2 A schematic diagram of another multi-coil wireless energy transmission system provided by the present invention is shown in FIG. Figure 2As shown, the multi-coil wireless energy transmission system may include an inverter circuit, a transmitting coil L1, a first relay coil L2, a second relay coil L3, a third relay coil L4, a receiving coil L5 and a rectifier circuit. The transmitting coil L1, the first relay coil L2, the second relay coil L3, the third relay coil L4 and the receiving coil L5 are arranged in sequence according to the optimized spacing. The first end of the transmitting coil L1 is connected to the midpoint of the first bridge arm of the inverter circuit (i.e., point A) through a parasitic resistor R1 and a compensation capacitor C1, and the second end of the transmitting coil L1 is connected to the second bridge arm of the inverter circuit. The midpoint of the receiving coil L5 is connected (i.e., point B), the first relay coil L2 is connected in series with the parasitic resistor R2 and the compensation capacitor C2 to form a first compensation loop, the first relay coil L3 is connected in series with the parasitic resistor R3 and the compensation capacitor C3 to form a second compensation loop, the third relay coil L4 is connected in series with the parasitic resistor R4 and the compensation capacitor C4 to form a third compensation loop, the first end of the receiving coil L5 is connected to the midpoint of the first bridge arm of the rectifier circuit (i.e., point a), the second end of the receiving coil L5 is connected to the midpoint of the second bridge arm of the rectifier circuit (i.e., point b), and the output end of the rectifier circuit is used to connect an external load R. Among them, the actual parasitic resistance of each coil is about 1.8Ω, the inductance value of the transmitting coil L1 can be 308.75μH, and the capacitance value of the compensation capacitor C1 can be 8.37nF; the inductance value of the first relay coil L2 can be 306μH, and the capacitance value of the compensation capacitor C2 can be 8.45nF; the inductance value of the second relay coil L3 can be 305.88μH, and the capacitance value of the compensation capacitor C3 can be 8.15nF; the inductance value of the third relay coil L4 can be 308.16μH, and the capacitance value of the compensation capacitor C4 can be 8.35nF; the inductance value of the receiving coil L5 can be 312.52μH, and the capacitance value of the compensation capacitor C5 can be 8.64nF.

[0069] like Figure 3 As shown, Figure 3 The schematic diagram of the arrangement of the five coils provided by the present invention, the spacing (air gap width) between the transmitting coil L1 and the first relay coil L2 is d1, the spacing between the first relay coil L2 and the second relay coil L3 is (air gap width) d2, the spacing between the second relay coil L3 and the third relay coil L4 is (air gap width) d3, and the spacing (air gap width) between the third relay coil L4 and the receiving coil L5 is d4, wherein the spacing (air gap width) d1, d2, d3 and d4 between each two coils are different. In addition, the rectifier circuit is connected to different external loads, and d1, d2, d3 and d4 are also different. Under different external loads, the optimized spacing and efficiency simulation results of the transmitting coil L1, the first relay coil L2, the second relay coil L3, the third relay coil L4 and the receiving coil L5 are shown in Table 1:

[0070]

[0071] Table 1

[0072] According to the contents in Table 1, it can be clearly seen that under the same external load, d1, d2, d3 and d4 of the multi-coil wireless energy transmission system after the optimized spacing are different, and the efficiency of the multi-coil wireless energy transmission system after the optimized spacing is significantly higher than that of the multi-coil wireless energy transmission system in the comparative example, wherein the spacings between the multiple coils in the multi-coil wireless energy transmission system in the comparative example are all equal; under different external loads, the spacings between any two adjacent coils in the multi-coil wireless energy transmission system after the optimized spacing are also different (i.e., d1, d2, d3 and d4 are different), for example: when the external loads are 40Ω, 60Ω and 80Ω respectively, the spacing d1 between the transmitting coil L1 and the first relay coil L2 is different, the spacing d2 between the first relay coil L2 and the second relay coil L3 is different, the spacing d3 between the second relay coil L3 and the third relay coil L4 is different, and the spacing d4 between the third relay coil L4 and the receiving coil L5 is also different.

[0073] The comparative example shown in Table 1 above is a five-coil wireless energy transmission system. The difference between the comparative example and the embodiment is that the spacing between the five coils of the comparative example is equidistant, and the spacing is 15 cm. The operating frequency of the comparative example system is 100kHz, and when the multiple coils in the system are placed at equal spacing (15 cm), the mutual inductance of two adjacent coils is 46.515μH. Table 1 is the optimized spacing of the system under different loads and the DC and DC simulation efficiency results of the system calculated by the optimization program. It can be seen from the simulation results that with the increase of the load resistance, the efficiency of the comparative example decreases more significantly. When the load resistance is 40Ω, 60Ω, 80Ω and 100Ω, the efficiency of the embodiment is improved by 8.47%, 4.43%, 10.13% and 12.38% respectively compared with the efficiency of the comparative example. The method proposed in the present invention by optimizing the coil spacing can enable the multi-coil wireless energy transmission system to maintain a high level of energy transmission efficiency under different loads, and can effectively solve the power supply problem of high-voltage online monitoring equipment. The simulation circuit diagram of the system is shown in Figure 4 As shown, Figure 5 , Figure 6 , Figure 7 and Figure 8 The specific simulation results when the system load is 40Ω and 80Ω respectively. The physical quantities in the simulation waveform are: the system input current I in , load current I out and load voltage V out .

[0074] Fig. 9 A schematic diagram of the structure of a three-dimensional solenoid coil provided by the present invention is shown in FIG. Fig. 9As shown, the diameter of each of the multiple coils is less than or equal to a preset diameter threshold, and each coil is a three-dimensional solenoid coil, which includes a hollow solenoid Litz coil on the outer layer of the coil and a longitudinally split ultra-thin magnetic conductive portion of the coil; the ultra-thin magnetic conductive portion of the coil is embedded in the hollow solenoid Litz coil, and the thickness of the ultra-thin magnetic conductive portion of the coil is less than or equal to a preset thickness threshold.

[0075] Among them, the preset diameter threshold can be 25cm (i.e., the diameter of the coil is ≤25cm), and the preset thickness threshold can be 1.5mm (i.e., the thickness of the ultra-thin magnetic conductor is ≤1.5mm). The longitudinally split ultra-thin magnetic conductor core is embedded in the Litz wire solenoid coil. The relative magnetic permeability of the magnetic conductor at a frequency of 100kHz is ≥400. The magnetic core of the ultra-thin magnetic conductor part of the coil can be an ultra-thin nanocrystalline material, such as: nanocrystalline magnetic conductor and nanocrystalline alloy strip. The nanocrystalline magnetic conductor has excellent soft magnetic properties such as low coercive force, high magnetic permeability and low loss. It can solve the problems of high loss of crystalline silicon steel materials, high noise of amorphous devices, and low magnetic induction of soft ferrites. The saturation magnetic induction intensity is more than three times that of ferrite, and it has the characteristics of good temperature stability and lightness.

[0076] It should be noted that the three-dimensional solenoid coil can increase the inductance value of the coil. The present invention designs a coil with a three-dimensional solenoid structure, which has a strong magnetic field confinement capability and a small parasitic resistance (coil parasitic resistance), and reduces the volume of the magnetic core by means of secondary longitudinal splitting, so that the weight and manufacturing cost of the coil are reduced while maintaining a high coupling coefficient of the coil. At the same time, the magnetic core of the coil is made of ultra-thin nanocrystalline material to further reduce the volume and weight of the coil, and reduce the influence of eddy current loss and core saturation.

[0077] For example, Fig.10 A schematic diagram of the structure of a hollow solenoid Litz coil provided by the present invention is shown in FIG. Fig.10 As shown, the coil diameter D of the three-dimensional solenoid coil C It can be 220mm. The three-dimensional solenoid coil can also include a coil height H C , coil thickness T C And the number of coil turns, coil height H C It can be 180mm, and the number of coil turns can be 29 turns. Fig.11 A schematic diagram of the structure of a longitudinally split ultra-thin magnetic conductor portion of a coil provided by the present invention, such as Fig.11 As shown, the ultra-thin magnetic conductive part of the coil may include a plurality of ultra-thin magnetic conductive cores, each of which has a height H F Can be 180mm, core thickness T F 1.5mm, core width L FThe centrifugal angle between two adjacent cores is θ F The centroid angle is 22.5° (the centroid angle can reflect the number of longitudinal divisions of the core), so that each core is longitudinally divided 16 times, and the diameter of the cylinder surrounded by the core is D F It is 207mm. Fig.12 A schematic diagram of a three-dimensional solenoid magnetic coupling structure based on an ultra-thin planar magnetic core provided by the present invention, such as Fig.12 As shown, for a multi-coil WPT (Wireless Power Transfer) system, a three-dimensional coil with an ultra-thin magnetic conductor added to the coil has a strong focusing ability on the spatial magnetic lines of force, can effectively concentrate the magnetic field, reduce leakage magnetic flux, and significantly improve the coupling coefficient between two adjacent coils.

[0078] Fig.13 A schematic diagram of an inverter circuit provided by the present invention is shown in FIG. Fig.13 As shown, the inverter circuit includes a first MOS tube Q1, a second MOS tube Q2, a third MOS tube Q3, a fourth MOS tube Q4, a common-mode inductor 1011 and a filter branch 1012, the filter branch 1012 includes a plurality of capacitors connected in parallel, and the parasitic resistance of the first MOS tube Q1, the second MOS tube Q2, the third MOS tube Q3 and the fourth MOS tube Q4 is 0.15Ω; the first MOS tube Q1 and the third MOS tube Q3 are connected in series to form a first bridge arm, the second MOS tube Q2 and the fourth MOS tube Q4 are connected in series to form a second bridge arm, and the first bridge arm and the second bridge arm are connected in parallel to form a full-bridge inverter; the full-bridge inverter is connected to the common-mode inductor 1011 through the filter branch 1012.

[0079] The first MOS tube Q1 , the second MOS tube Q2 , the third MOS tube Q3 and the fourth MOS tube Q4 can all be IRF640NPBF, and the parasitic resistance of the MOS tube is 0.15Ω.

[0080] It should be noted that, by controlling the on / off of the first MOS transistor Q1, the second MOS transistor Q2, the third MOS transistor Q3 and the fourth MOS transistor Q4 through PWM (Pulse Width Modulation), PWM can be generated through a PWM generating circuit. For example, the connection relationship of the PWM generating circuit can be as follows: Fig.14 As shown, the PWM generation circuit includes: a driver U1, a diode D1, a bypass capacitor C1 and a bootstrap capacitor C2; the driver U1 includes V CC pin, COM pin, V B Pin, V S pin, HO pin and LO pin, V CCThe pin is connected to the positive electrode of bypass capacitor C1 and the anode of diode D1, the COM pin is connected to the negative electrode of bypass capacitor C1 and grounded, V B The pin is connected to the cathode of diode D1 and the positive terminal of bootstrap capacitor C2, V S The pin is connected to the negative electrode of the bootstrap capacitor C2, and the HO pin and the LO pin are used to connect the MOS tube and output PWM to the MOS tube to control the on or off of the MOS tube. Among them, the driver U1 can be a chip of the IRS21867STRPBF model, and the capacitance value of the bypass capacitor C1 and the bootstrap capacitor C is 1uF.

[0081] Fig.15 A schematic diagram of an inverter circuit provided by the present invention is shown in FIG. Fig.15 As shown, the rectifier circuit may include a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4. The first diode D1, the second diode D2, the third diode D3 and the fourth diode D4 may all adopt a common cathode Schottky diode with a conduction voltage drop of 0.86V; the first diode and the third diode may be connected in series to form a third bridge arm, the second diode and the fourth diode may be connected in series to form a fourth bridge arm, and the third bridge arm may be connected in parallel with the fourth bridge arm.

[0082] It should be noted that the common cathode Schottky diode has a large conduction current capability, and the conduction voltage drop is 0.86V. The model of the common cathode Schottky diode may be MBR40200WT.

[0083] The present invention can arrange multiple coils according to optimized spacing, and the optimized spacing between two adjacent coils in the multiple coils is different, which can improve the transmission distance and efficiency of the multi-coil wireless energy transmission system under different loads and effectively solve the power supply problem of high-voltage online monitoring equipment.

[0084] Embedding wireless power transmission devices into the long air gap of high-voltage insulating pillars can effectively solve the power supply problem of high-voltage online monitoring equipment. The most widely used magnetic induction wireless energy transmission technology currently has a main operating frequency of tens of kHz to hundreds of kHz, and the existing high-voltage insulating pillar wireless energy transmission operating frequency is concentrated in hundreds of kHz. At this frequency, strengthening the coupling degree between coils by adding magnetic conductors is an effective way to improve the efficiency and distance of wireless energy transmission in insulating pillars. Nanocrystalline magnetic conductors have excellent soft magnetic properties such as low coercivity, high magnetic permeability and low loss. They can solve the problems of high loss of crystalline silicon steel materials, high noise of amorphous devices, and low magnetic induction of soft ferrites. The saturation magnetic induction intensity is more than three times that of ferrites, and it has good temperature stability and is light and thin. This makes it possible to apply high magnetic induction intensity and low loss nanocrystalline alloy strips to long air gap wireless energy transmission devices for high-voltage insulating pillars to solve the problem of power supply difficulties for monitoring devices.

[0085] In addition, traditional wireless energy transmission systems generally place coils at equal intervals. As the load changes, the efficiency of the system cannot always be maintained at a high level. Considering the system circuit structure, the coil spacing can be changed by optimizing the design to achieve efficient operation of the system. The present invention proposes a series compensation wireless energy transmission system based on an ultra-thin magnetic conductive core. The magnetic coupling mechanism adopts a three-dimensional solenoid structure. The design is capable of realizing a system with a long air gap of 1.5m for wireless energy transmission. By optimizing the arrangement of the coils, an energy transmission efficiency of more than 40% can be achieved.

[0086] Embodiment 2:

[0087] The present invention based on the same inventive concept also provides a design method for a multi-coil wireless energy transmission system.

[0088] Fig.16 A flow chart of a design method for a multi-coil wireless energy transmission system provided by the present invention, such as Fig.16 As shown, the design method of the multi-coil wireless energy transmission system may include the following steps:

[0089] In step 101, an equivalent circuit model of a multi-coil wireless energy transmission system is established based on the topological structure of the multi-coil wireless energy transmission system.

[0090] It should be noted that the topological structure of the multi-coil wireless energy transmission system is as follows Figure 1 As shown in Figure 2, the equivalent circuit model of the multi-coil wireless energy transmission system is as follows: Fig.17 As shown. The topological structure of the multi-coil wireless energy transmission system can be input to identify the electronic components in the topological structure, determine the connection relationship between each electronic component (for example, series connection, parallel connection, and mixed connection, etc.), and establish an equivalent circuit model of the multi-coil wireless energy transmission system.

[0091] Possible implementation methods of this step may be (1) proposing a novel multi-coil wireless energy transmission system topology, analyzing the novel multi-coil wireless energy transmission system topology, and establishing an ESR (Equivalent Series Resistance) equivalent circuit model of the multi-coil wireless energy transmission system.

[0092] In step 102, based on the equivalent circuit model, objective function, constraint conditions and optimization algorithm of the multi-coil wireless energy transmission system, an optimized distance between two adjacent coils among the multiple coils is determined.

[0093] Among them, the specific implementation method of the optimization algorithm can be: classify the optimization problem into a mathematical linear programming problem, assume that the current value of the last coil is 1, and obtain the relationship between the coil coupling coefficient and the coil spacing through the following current recursive relationship and the actual measurement of the mutual inductance value at different distances of the coil. The maximum efficiency of the multi-coil wireless energy transmission system is taken as the optimization goal. Under given constraints, the linear programming problem is solved in the MATHEMETICA software according to the system loop equation to obtain the optimization result of the coil spacing (that is, the optimized spacing between two adjacent coils in multiple coils).

[0094] It should be noted that before executing this step, the method may also include the following steps: determining the objective function based on the equivalent resistance of the rectifier circuit and the subsequent circuit of the rectifier circuit, and the output current and parasitic resistance of each coil in the multiple coils; determining the constraint conditions based on the equivalent resistance of the full-bridge rectifier and the subsequent circuit of the full-bridge rectifier, and the spacing between two adjacent coils in the multiple coils.

[0095] The objective function satisfies the following formula:

[0096]

[0097] In the above formula, I n It can be understood as a function of the output current and the coil spacing.

[0098] The constraints satisfy the following formula:

[0099]

[0100] Where η is the system efficiency, I i is the output current of the ith coil, I n is the output current of the nth coil, R i is the parasitic resistance of the ith coil, R eqis the equivalent resistance of the rectifier circuit and the subsequent circuit of the rectifier circuit, d1 is the distance between the first coil and the second coil, d n-1 is the distance from the n-1th coil to the nth coil, d total is the transmission distance of the multi-coil wireless energy transmission system, R given is a given equivalent resistance value.

[0101] After executing this step, the method may further include: performing circuit simulation on the optimized spacing to obtain the optimized system efficiency; when the optimized system efficiency is less than or equal to the system efficiency before optimization, re-optimizing the spacing between two adjacent coils in the multiple coils, wherein the system efficiency before optimization is the efficiency of the multi-coil wireless energy transmission system when the multiple coils are arranged in an equal spacing manner.

[0102] It should be noted that through Figure 4 The simulation circuit shown performs circuit simulation on the optimized spacing to obtain the system efficiency shown in the above Table 1. In general, the efficiency of the optimized multi-coil wireless energy transmission system obtained by the design method of the multi-coil wireless energy transmission system provided by the present invention is higher than the efficiency of the multi-coil wireless energy transmission system with equal spacing. The simulation circuit can avoid the phenomenon that the efficiency of the optimized multi-coil wireless energy transmission system is lower than the efficiency of the multi-coil wireless energy transmission system with equal spacing, and the reliability of the design method can be improved.

[0103] In step 103, the multi-coil wireless energy transmission system is constructed based on the optimized spacing and the design parameters of each coil.

[0104] Among them, the design parameters include the coil diameter D C , coil height H C and the number of coil turns, and the core height H F , core thickness T F , Core width L F , the centrifugal angle between two adjacent cores is θ F , and may also include inductance parameters, capacitance parameters, and parasitic resistance parameters. Each coil may be a three-dimensional solenoid coil to increase the inductance value, and the three-dimensional solenoid coil includes a hollow solenoid Litz coil on the outer layer of the coil and a longitudinally split ultra-thin magnetic conductive part of the coil; the ultra-thin magnetic conductive part of the coil is embedded in the hollow solenoid Litz coil, and the thickness of the ultra-thin magnetic conductive part of the coil is less than or equal to a preset thickness threshold.

[0105] The implementation method of this step can be to design a three-dimensional coil structure through the design parameters of the coil, and arrange the three-dimensional coil according to the optimized spacing, as shown in the following example. Figure 1In the manner shown, the transmitting coil in the coil is connected to the inverter circuit, and the receiving coil is connected to the rectifier circuit to obtain a multi-coil wireless energy transmission system.

[0106] It should be noted that, unlike the traditional equidistant system, the present invention can achieve the highest efficiency of the multi-coil wireless energy transmission system under different loads through the above optimized spacing design method for different loads. Taking the maximum system efficiency as the objective function, according to the constraints, the corresponding optimized coil spacing value when the system is connected to different load resistances can be calculated by writing a program, and a multi-coil wireless energy transmission system can be constructed according to the optimized coil spacing value to achieve efficient energy transmission under different loads.

[0107] For example, Fig.10 As shown, the coil diameter D of the three-dimensional solenoid coil C It can be 220 mm (or, coil diameter ≤ 25 cm), and the three-dimensional solenoid coil can also include a coil height H C And the number of coil turns, coil height H C It can be 180mm, and the number of coil turns can be 29. Fig.11 As shown, the ultra-thin magnetic conductive part of the coil may include a plurality of ultra-thin magnetic conductive cores, each of which has a height H F Can be 180mm, core thickness T F 1.5mm, core width L F The centrifugal angle between two adjacent cores is θ F The centroid angle is 22.5° (the centroid angle can reflect the number of longitudinal divisions of the core), so that each core is longitudinally divided 16 times, and the diameter of the cylinder surrounded by the core is D F The maximum energy transmission distance of the multi-coil wireless energy transmission system is ≥1.50m, the maximum power supply power is ≥50W, and the maximum transmission efficiency of DC input-DC output is ≥40%.

[0108] Optionally, the simulation circuit diagram of the system is as follows Figure 4 As shown, the multi-coil wireless energy transmission system is simulated and verified.

[0109] For example, the optimized spacing is input into PSIM (Power Simulation) circuit simulation software, and the optimized system efficiency is simulated and analyzed in the PSIM circuit simulation software. The simulation is performed when the system load is 40Ω and 80Ω respectively. Figure 5 , Figure 6 , Figure 7 and Figure 8 The specific simulation results when the system load is 40Ω and 80Ω respectively. The physical quantities in the simulation waveform are: the system input current Iin , load current I out and load voltage V out . Figure 5 and Figure 7 It is a schematic diagram of simulation results of a comparative example. The five coils of the comparative example are equidistantly spaced with a spacing of 15 cm. The operating frequency of the comparative example system is 100 kHz, and the mutual inductance of two adjacent coils is 46.515 μH.

[0110] Fig.18 A flow chart of a design method for a multi-coil wireless energy transmission system provided by the present invention, such as Fig.18 As shown above Fig.16 Possible implementations of step 102 shown may include the following steps:

[0111] In step 1021, a loop equation of the multi-coil wireless energy transmission system is constructed based on an equivalent circuit model of the multi-coil wireless energy transmission system.

[0112] The specific implementation method of this step can be to construct the loop equation based on the output current, compensation capacitance, self-inductance parameter and parasitic resistance of each coil in the equivalent circuit model, the mutual inductance parameter of any two coils among the multiple coils and the AC voltage of the input magnetic coupling mechanism of the full-bridge inverter.

[0113] It should be noted that the distance between two non-adjacent coils in the multi-coil wireless energy system is much larger than the distance between two adjacent coils. Therefore, the mutual inductance between two non-adjacent coils is much smaller than the mutual inductance between two adjacent coils. Only the mutual inductance between two adjacent coils needs to be considered, that is, M 12 With M (n与1)n .like Fig.17 In the equivalent circuit model of the multi-coil wireless energy transmission system shown in FIG. 1 , the last-stage receiving coil is connected to the rectifier circuit at the output end, so the voltage and current passing through the rectifier bridge in the rectifier circuit are in phase.

[0114] The loop equation can satisfy the following formula:

[0115]

[0116] Where ω is the operating frequency of the multi-coil wireless energy transmission system, C i is the series compensation capacitor of the i-th coil (i can be 1, 2…n), L i is the self-inductance parameter of the i-th coil (i can be 1, 2…n), X i is the reactance parameter of the i-th coil (i can be 1, 2…n), R eq is the equivalent resistance of the full-bridge rectifier and the subsequent circuit of the full-bridge rectifier, U ABis the AC voltage of the magnetic coupling mechanism input to the full-bridge inverter, U in is the DC voltage input to the multi-coil wireless energy transmission system, R i is the parasitic resistance of the i-th coil (i can be 1, 2…n), M ab is the mutual inductance parameter between the ath coil and the bth coil (a can be 1, 2…n-1, b can be 2, 3…n, a and b are different), I i is the output current of the i-th coil (i can be 1, 2...n).

[0117] For example, Figure 2 As shown, the multi-coil wireless energy transmission system may include an inverter circuit, a transmitting coil L1, a first relay coil L2, a second relay coil L3, a third relay coil L4, a receiving coil L5 and a rectifier circuit. The loop equation of the multi-coil wireless energy transmission system may be as follows:

[0118]

[0119] Among them, the multi-coil wireless energy transmission system has the characteristics of constant voltage input and constant voltage output, and its transformation ratio G V Can be:

[0120]

[0121] Among them, U out is the DC voltage output by the multi-coil wireless energy transmission system, U ab is the AC voltage of the input rectifier, the transformation ratio G V It can be used to calculate the efficiency of multi-coil wireless energy transfer systems.

[0122] In step 1022, the loop equation is solved to obtain expressions of output current and AC input voltage and a current recursive expression.

[0123] Among them, the output current is the output current of the multi-coil wireless energy transmission system, and the AC input voltage is the AC input voltage of the magnetic coupling mechanism.

[0124] It should be noted that due to the parasitic resistance R1 and R n It is usually small and can be ignored when analyzing the ideal output characteristics of the system. By deriving the loop equation, the output current I of the multi-coil wireless energy transmission system can be obtained. n With AC input voltage U AB The relationship between the output current and the AC input voltage can be expressed as follows:

[0125]

[0126] Among them, In is the output current of the nth coil, U AB The AC voltage of the magnetic coupling mechanism is input to the full-bridge inverter. G1 and G2 are constants related to the mutual inductance coefficient obtained by calculating the system loop matrix in the calculation tool MATLAB according to the specific value of n. In order to meet the goal of the present invention to provide a constant voltage, the system should select an odd number of coils. In the actual system, the parasitic resistance R1 and R n There will be a small voltage drop and power loss. When the load fluctuates within a certain range, the system's constant voltage input and constant voltage output characteristics can be considered unchanged.

[0127] The current recursive expression can be expressed as follows:

[0128]

[0129] Among them, R eq is the equivalent resistance of the full-bridge rectifier and the subsequent circuit of the full-bridge rectifier, X i is the reactance parameter of the i-th coil (i can be 1, 2…n), R i is the parasitic resistance of the i-th coil (i can be 1, 2…n), M ab is the mutual inductance parameter between the ath coil and the bth coil (a can be 1, 2…n-1, b can be 2, 3…n, a and b are different), I i is the output current of the i-th coil.

[0130] In step 1023, based on the current recursive expression and the mutual inductance values ​​of the coils at different spacings, a curve of the relationship between the output current and the coil spacing is fitted.

[0131] It should be noted that the mutual inductance values ​​of the coils at different spacings can be obtained through actual measurement.

[0132] In step 1024, based on the constraint conditions, the output current and coil spacing relationship curve and the output current and AC input voltage expression, the objective function is maximized to obtain the optimized spacing between two adjacent coils in the plurality of coils.

[0133] It should be noted that maximizing the objective function can be understood as taking the maximum efficiency of the multi-coil wireless energy transmission system as the goal.

[0134] The present invention determines the optimized spacing between two adjacent coils among multiple coils through the equivalent circuit model, objective function and constraint conditions of the multi-coil wireless energy transmission system, and constructs the multi-coil wireless energy transmission system through the optimized spacing, which can improve the transmission distance and efficiency of the multi-coil wireless energy transmission system under different loads and effectively solve the power supply problem of high-voltage online monitoring equipment.

[0135] Embodiment 3:

[0136] Based on the same inventive concept, the present invention also provides an electronic device, such as Fig.19 As shown, Fig.19 A schematic diagram of an electronic device provided by the present invention, the electronic device includes a processor and a memory, the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, and is specifically suitable for loading and executing one or more instructions in a computer storage medium to implement the corresponding method flow or corresponding functions, so as to implement the steps of a design method of a multi-coil wireless energy transmission system in the above embodiment.

[0137] Embodiment 4:

[0138] Based on the same inventive concept, the present invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in an electronic device for storing programs and data. It can be understood that the computer-readable storage medium here can include both built-in storage media in electronic devices and, of course, extended storage media supported by electronic devices. The computer-readable storage medium provides a storage space that stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by a processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of a design method for a multi-coil wireless energy transmission system in the above embodiment.

[0139] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0140] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0141] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0142] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0143] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. A multi-coil wireless energy transmission system, characterized in that: include: An inverter circuit, a rectifier circuit and a plurality of coils; The multiple coils include a transmitting coil, a receiving coil and a plurality of relay coils arranged according to an optimized spacing and a preset order, wherein the optimized spacings of two adjacent coils in the multiple coils are different, and the spacings of the two adjacent coils are determined based on an external load; the transmitting coil is connected to the inverter circuit, and the receiving coil is connected to the rectifier circuit; The inverter circuit converts the current input into the multi-coil wireless energy transmission system into alternating current, transmits the alternating current to the multiple relay coils through the transmitting coil, transmits the alternating current to the receiving coil through the multiple relay coils, and the receiving coil inputs the alternating current into the rectifier circuit, which converts the alternating current into new direct current to supply power to an external load.

2. The system according to claim 1, characterized in that The diameter of each coil in the plurality of coils is less than or equal to a preset diameter threshold, and each coil is a three-dimensional solenoid coil, and the three-dimensional solenoid coil comprises a hollow solenoid Litz coil on the outer layer of the coil and an ultra-thin magnetic conductive body portion of the coil split longitudinally; The ultra-thin magnetic conductive part of the coil is embedded in the hollow solenoid Litz coil, and the thickness of the ultra-thin magnetic conductive part of the coil is less than or equal to a preset thickness threshold.

3. The system according to claim 2, characterized in that The reactive power compensation of each coil is compensated by connecting the compensation capacitor and the parasitic resistance in series.

4. The system according to claim 1, characterized in that The inverter circuit includes a first MOS tube, a second MOS tube, a third MOS tube, a fourth MOS tube, a common mode inductor and a filter branch, the filter branch includes a plurality of capacitors connected in parallel, and the parasitic resistance of the first MOS tube, the second MOS tube, the third MOS tube and the fourth MOS tube is 0.15Ω; The first MOS tube and the third MOS tube are connected in series to form a first bridge arm, the second MOS tube and the fourth MOS tube are connected in series to form a second bridge arm, and the first bridge arm and the second bridge arm are connected in parallel to form a full-bridge inverter; The full-bridge inverter is connected to the common-mode inductor through the filter branch.

5. The system according to claim 1, characterized in that The rectifier circuit includes a first diode, a second diode, a third diode and a fourth diode, and the first diode, the second diode, the third diode and the fourth diode are all common cathode Schottky diodes with a conduction voltage drop of 0.86V; The first diode and the third diode are connected in series to form a third bridge arm, the second diode and the fourth diode are connected in series to form a fourth bridge arm, and the third bridge arm and the fourth bridge arm are connected in parallel.

6. A design method for a multi-coil wireless energy transmission system, characterized in that: The method comprises: Based on the topological structure of the multi-coil wireless energy transmission system, an equivalent circuit model of the multi-coil wireless energy transmission system is established; Determine an optimized spacing between two adjacent coils among the multiple coils based on an equivalent circuit model, an objective function, constraints and an optimization algorithm of the multi-coil wireless energy transmission system; Based on the optimized spacing and the design parameters of each coil, the multi-coil wireless energy transmission system is constructed.

7. The method according to claim 6, characterized in that The step of determining the optimized spacing between two adjacent coils among the multiple coils based on the equivalent circuit model, objective function, constraint conditions and optimization algorithm of the multi-coil wireless energy transmission system includes: Based on the equivalent circuit model of the multi-coil wireless energy transmission system, constructing a loop equation of the multi-coil wireless energy transmission system; Solving the loop equation to obtain output current and AC input voltage expressions and current recursive expressions, wherein the output current is the output current of the multi-coil wireless energy transmission system, and the AC input voltage is the AC input voltage of the magnetic coupling mechanism; Based on the current recursive expression and the mutual inductance values ​​of the coils at different spacings, a curve of the relationship between the output current and the coil spacing is obtained by fitting; Based on the constraint conditions, the output current and coil spacing relationship curve and the output current and AC input voltage expression, the objective function is maximized to obtain the optimized spacing between two adjacent coils in the multiple coils.

8. The method according to claim 7, characterized in that The equivalent circuit model of the multi-coil wireless energy transmission system is used to construct a loop equation of the multi-coil wireless energy transmission system, including: The loop equation is constructed based on the output current, compensation capacitance, self-inductance parameter and parasitic resistance of each coil in the equivalent circuit model, the mutual inductance parameter of any two coils among the multiple coils and the AC voltage of the input magnetic coupling mechanism of the full-bridge inverter.

9. The method according to claim 6 or 7, characterized in that: Before determining the optimized spacing between two adjacent coils among the multiple coils based on the equivalent circuit model, objective function, constraint conditions and optimization algorithm of the multi-coil wireless energy transmission system, the method further includes: Determining the objective function based on the equivalent resistance of the rectifier circuit and the subsequent circuit of the rectifier circuit, the output current and the parasitic resistance of each coil in the plurality of coils; Determining the constraint condition based on an equivalent resistance of a full-bridge rectifier and a subsequent circuit of the full-bridge rectifier, and a distance between two adjacent coils among a plurality of coils; The objective function satisfies the following formula: The constraints satisfy the following formula: Where η is the system efficiency, I i is the output current of the ith coil, I n is the output current of the nth coil, R i is the parasitic resistance of the ith coil, R eq is the equivalent resistance of the rectifier circuit and the subsequent circuit of the rectifier circuit, d1 is the distance between the first coil and the second coil, d n-1 is the distance from the n-1th coil to the nth coil, d total is the transmission distance of the multi-coil wireless energy transmission system, R given is a given equivalent resistance value.

10. The method according to claim 6, characterized in that After determining the optimized spacing between two adjacent coils among the multiple coils based on the equivalent circuit model, objective function, constraint conditions and optimization algorithm of the multi-coil wireless energy transmission system, the method further includes: Performing circuit simulation on the optimized spacing to obtain optimized system efficiency; When the optimized system efficiency is less than or equal to the system efficiency before optimization, the spacing between two adjacent coils in the multiple coils is re-optimized, wherein the system efficiency before optimization is the efficiency of the multi-coil wireless energy transmission system when the multiple coils are arranged in an equal spacing manner.

11. An electronic device, characterized in that: include: one or more processors; The processor is used to store one or more programs; When the one or more programs are executed by the one or more processors, the design method of the multi-coil wireless energy transmission system according to any one of claims 6 to 10 is implemented.

12. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed, the design method of the multi-coil wireless energy transmission system as described in any one of claims 6 to 10 is implemented.

Images