A dynamic tuning method for a multi-stage magnetic resonance wireless power transmission system embedded in an insulator

Abstract

This invention discloses a dynamic tuning method for a multi-stage magnetic resonant wireless power transmission system with embedded insulators. The multi-stage magnetic resonant wireless power transmission system includes an adjustable inductor that adjusts the phase difference at the system's transmitting end. The dynamic tuning method includes: constructing an equivalent model of the system based on the circuit model of the multi-stage magnetic resonant wireless power transmission system; determining the relationship between the system input phase angle and the inductance value of the adjustable inductor at system resonance based on the equivalent model; determining the number of coil turns of the adjustable inductor based on the relationship between the system input phase angle and the inductance value of the adjustable inductor and the magnetoresistive equivalent model; and adjusting the adjustable inductor according to the number of coil turns to dynamically tune the multi-stage magnetic resonant wireless power transmission system. By implementing this invention, dynamic tuning of the multi-stage magnetic resonant wireless power transmission system is achieved. This solves the technical problem of system detuning caused by parameter disturbances in existing wireless power transmission devices.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wireless power supply, in particular to a dynamic tuning method of a multi-stage magnetic resonance wireless energy transmission system embedded in an insulator. BACKGROUND

[0002] Wireless power transmission based on near-field electromagnetic coupling principle is a new emerging power supply technology that is safe and flexible, and has no wire contact, and can adapt to various harsh weather environments, and has been widely used in the fields of biological medicine, consumer electronics, electric vehicles and intelligent industry. At present, the safety of power grid needs a large number of modern monitoring equipment to be put into operation, and the working state of the power transmission network can be remotely observed through the monitoring equipment. In recent years, some scholars combine the wireless power supply system with the insulator to form a wireless power supply system based on the insulator to supply power to the monitoring equipment, and the structure of the insulator does not change, but it has both insulation and energy transmission electrical characteristics.

[0003] In order to solve the problem of near-field coupling transmission distance limitation, more and more scholars take multi-relay coil structure and domino coil structure to increase the transmission distance of the system. At present, the method of long-distance wireless power transmission is to add a relay side structure unit between the energy transmitting end structure unit and the energy receiving end structure unit, and to realize energy transmission under long-distance by using the magnetic coupling resonance of the relay coil. Due to the increase of the number of elements and the complex coupling relationship between the multiple coils, the system is more sensitive to parameter changes. The system in the resonant state is a necessary condition to realize high-efficiency and stable energy transmission. Therefore, how to control the system to be in the resonant state is very important for power transmission. SUMMARY

[0004] Therefore, the embodiment of the present application provides a dynamic tuning method of a multi-stage magnetic resonance wireless energy transmission system embedded in an insulator to solve the technical problem of system detuning caused by parameter disturbance of the existing wireless power transmission device in the prior art.

[0005] The technical scheme provided by the present application is as follows:

[0006] The first aspect of the embodiment of the present application provides a dynamic tuning method of a multi-stage magnetic resonance wireless energy transmission system embedded in an insulator, wherein the multi-stage magnetic resonance wireless energy transmission system comprises an adjustable inductance for adjusting the phase difference of the system transmitting end, and the dynamic tuning method comprises the following steps: constructing a system equivalent model according to the circuit model of the multi-stage magnetic resonance wireless energy transmission system; determining the relationship between the system input phase angle and the inductance value of the adjustable inductance when the system is in resonance according to the system equivalent model; determining the number of turns of the coil of the adjustable inductance based on the relationship between the system input phase angle and the inductance value of the adjustable inductance and the magnetic resistance equivalent model; and adjusting the adjustable inductance according to the number of turns of the coil, and dynamically tuning the multi-stage magnetic resonance wireless energy transmission system.

[0007] Optionally, the relationship between the input phase angle of the system and the inductance value of the adjustable inductor when the system is in resonance is determined according to the equivalent model of the system, comprising: determining the relationship between the self-induction of each coil in the system and the resonance capacitance when the system is in resonance according to the equivalent model of the system; when the mutual inductance of adjacent coils in the system is equal and the equivalent load of each coil is equal, determining the relationship between the input phase angle of the system and the inductance value of the adjustable inductor according to the relationship between the self-induction of each coil in the system and the resonance capacitance.

[0008] Optionally, the number of turns of the coil of the adjustable inductor is determined based on the relationship between the input phase angle of the system and the inductance value of the adjustable inductor and the equivalent model of the magnetic resistance, comprising: determining the relationship between the number of turns of the main coil and the inductance based on the equivalent model of the magnetic resistance, the main magnetic flux, and the relationship between the flux linkage and the main magnetic flux, the number of turns of the coil, and the inductance; determining the number of turns of the main coil based on the relationship between the input phase angle of the system and the inductance value of the adjustable inductor and the relationship between the number of turns of the main coil and the inductance; and determining the number of turns of the auxiliary coil based on the relationship between the minimum magnetic permeability and the maximum magnetic density of the core of the adjustable inductor.

[0009] Optionally, after the number of turns of the coil of the adjustable inductor is determined based on the relationship between the input phase angle of the system and the inductance value of the adjustable inductor and the equivalent model of the magnetic resistance, the method further comprises: changing the coil parameters in the multi-stage magnetic resonance wireless power transmission system, and determining the inductance value of the adjustable inductor when the system is at the resonance point; when the inductance value of the adjustable inductor is less than zero when the system is at the resonance point, adjusting the resonance capacitance of the transmitting coil in the multi-stage magnetic resonance wireless power transmission system; and re-determining the number of turns of the coil of the adjustable inductor according to the adjusted resonance capacitance.

[0010] Optionally, the number of turns of the coil of the adjustable inductor is determined based on the relationship between the input phase angle of the system and the inductance value of the adjustable inductor and the equivalent model of the magnetic resistance, comprising: determining the relationship between the number of turns of the main coil and the inductance based on the equivalent model of the magnetic resistance, the main magnetic flux, and the relationship between the flux linkage and the main magnetic flux, the number of turns of the coil, and the inductance; determining the number of turns of the main coil based on the relationship between the input phase angle of the system and the inductance value of the adjustable inductor and the relationship between the number of turns of the main coil and the inductance; and determining the number of turns of the auxiliary coil based on the relationship between the minimum magnetic permeability and the maximum magnetic density of the core of the adjustable inductor.

[0011] Optionally, the multi-stage magnetic resonance wireless power transmission system dynamic tuning method further comprises: determining the system output voltage gain expression according to the definition of the voltage gain; and calculating the output voltage gain variation when the self-induction of the coil in the system is changed with and without the adjustable inductor adjustment according to the output voltage gain expression.

[0012] The second aspect of the embodiment of the present application provides a dynamic tuning system of a multi-stage magnetic resonance wireless power transmission system embedded with an insulator, comprising: a microprocessor and a transmitting circuit, a resonance coil and a receiving circuit connected in sequence, wherein the transmitting circuit comprises an adjustable inductor for adjusting the phase difference of the transmitting end of the system, the transmitting circuit, the resonance coil and the receiving circuit connected in sequence are used for energy transmission, and the microprocessor constructs a system equivalent model according to the circuit model of the transmitting circuit, the resonance coil and the receiving circuit connected in sequence; determines the relationship between the system input phase angle and the inductance value of the adjustable inductor when the system is in resonance according to the system equivalent model; determines the number of turns of the coil of the adjustable inductor based on the relationship between the system input phase angle and the inductance value of the adjustable inductor and the magnetic resistance equivalent model; adjusts the adjustable inductor according to the number of turns of the coil, and dynamically tunes the multi-stage magnetic resonance wireless power transmission system.

[0013] Optionally, the microprocessor is further configured to determine the relationship between the self-inductance of each coil in the system and the resonance capacitance when the system is in resonance according to the system equivalent model; and when the mutual inductance of adjacent coils in the system is equal and the equivalent load of each coil is equal, determine the relationship between the system input phase angle and the inductance value of the adjustable inductor according to the relationship between the self-inductance of each coil in the system and the resonance capacitance.

[0014] Optionally, the microprocessor is further configured to determine the relationship between the number of turns of the main coil and the inductance based on the magnetic resistance equivalent model, the main magnetic flux, and the relationship between the flux linkage and the main magnetic flux, the number of turns of the coil and the inductance; determine the number of turns of the main coil based on the relationship between the system input phase angle and the inductance value of the adjustable inductor and the relationship between the number of turns of the main coil and the inductance; and determine the number of turns of the auxiliary coil based on the relationship between the minimum magnetic permeability and the maximum magnetic density of the core of the adjustable inductor.

[0015] Optionally, the microprocessor is further configured to change the coil parameters in the multi-stage magnetic resonance wireless power transmission system, determine the inductance value of the adjustable inductor when the system is at the resonance point; when the inductance value of the adjustable inductor is less than zero when the system is at the resonance point, adjust the resonance capacitance of the transmitting coil in the multi-stage magnetic resonance wireless power transmission system; and re-determine the number of turns of the coil of the adjustable inductor according to the adjusted resonance capacitance.

[0016] Optionally, the microprocessor is further configured to collect the voltage and current of the inverter port in the multi-stage magnetic resonance wireless power transmission system; compare the phase determined according to the voltage and current with a reference phase, generate an adjustment signal according to the comparison result; and adjust the number of turns of the coil of the adjustable inductor according to the adjustment signal, and dynamically tune the multi-stage magnetic resonance wireless power transmission system.

[0017] Optionally, the microprocessor is further configured to determine an output voltage gain expression of the system according to the definition of the voltage gain; and calculate the output voltage gain variation when the self-inductance of the coil in the system is changed, with and without the adjustable inductor adjustment, according to the output voltage gain expression.

[0018] The third aspect of the embodiment of the present application provides a dynamic tuning device of an embedded insulator multi-stage magnetic resonance wireless power transmission system, comprising: the multi-stage magnetic resonance wireless power transmission system comprises an adjustable inductor for adjusting the phase difference of the transmitting end of the system; the dynamic tuning device comprises: a model construction module, configured to construct a system equivalent model according to a circuit model of the multi-stage magnetic resonance wireless power transmission system; a relationship determination module, configured to determine the relationship between the system input phase angle and the inductance value of the adjustable inductor when the system is in resonance according to the system equivalent model; a coil turn number determination module, configured to determine the coil turn number of the adjustable inductor based on the relationship between the system input phase angle and the inductance value of the adjustable inductor and a magnetic resistance equivalent model; and a tuning module, configured to adjust the coil turn number of the adjustable inductor according to the coil turn number, and dynamically tune the multi-stage magnetic resonance wireless power transmission system.

[0019] Optionally, the relationship determination module is specifically configured to determine the relationship between the self-induction of each coil in the system and the resonance capacitance when the system is in resonance according to the system equivalent model; and when the mutual inductance of adjacent coils in the system is equal and the equivalent load of each coil is equal, the relationship between the system input phase angle and the inductance value of the adjustable inductor is determined according to the relationship between the self-induction of each coil in the system and the resonance capacitance.

[0020] Optionally, the coil turn number determination module is specifically configured to determine the relationship between the main coil turn number and the inductance based on the main magnetic flux and the relationship between the flux linkage and the main magnetic flux, the coil turn number and the inductance; determine the main coil turn number based on the relationship between the system input phase angle and the inductance value of the adjustable inductor and the relationship between the main coil turn number and the inductance; and determine the auxiliary coil turn number based on the relationship between the minimum magnetic permeability and the maximum magnetic density of the core of the adjustable inductor.

[0021] Optionally, the dynamic tuning device of the embedded insulator multi-stage magnetic resonance wireless power transmission system further comprises: a judgment module, configured to change the coil parameters in the multi-stage magnetic resonance wireless power transmission system, and judge the inductance value of the adjustable inductor when the system is at the resonance point; an adjustment module, configured to adjust the resonance capacitance of the transmitting coil in the multi-stage magnetic resonance wireless power transmission system when the inductance value of the adjustable inductor is less than zero when the system is at the resonance point; and a turn number adjustment module, configured to redetermine the coil turn number of the adjustable inductor according to the adjusted resonance capacitance.

[0022] Optionally, the tuning module is specifically configured to collect the voltage and current of the inverter port in the multi-stage magnetic resonance wireless power transmission system; compare the phase determined according to the voltage and current with a reference phase, and generate an adjustment signal according to the comparison result; and adjust the coil turn number of the adjustable inductor according to the adjustment signal, and dynamically tune the multi-stage magnetic resonance wireless power transmission system.

[0023] Optionally, the dynamic tuning device for the multi-stage magnetic resonance wireless power transmission system with embedded insulators further includes: a gain determination module, used to determine the system output voltage gain expression according to the definition of voltage gain; and a change determination module, used to calculate the output voltage gain change when the coil self-inductance in the system is changed, with and without adjustable inductance adjustment, according to the output voltage gain expression.

[0024] A fourth aspect of the present invention provides a computer-readable storage medium storing computer instructions for causing the computer to perform the dynamic tuning method for a multi-stage magnetic resonant wireless power transmission system with embedded insulators as described in the first aspect and any one of the first aspects of the present invention.

[0025] A fifth aspect of the present invention provides an electronic device, comprising: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the dynamic tuning method for a multi-stage magnetic resonant wireless power transmission system with embedded insulators as described in the first aspect and any one of the first aspects of the present invention.

[0026] The technical solution provided by this invention has the following effects:

[0027] The present invention provides a dynamic tuning method for a multi-stage magnetic resonant wireless power transmission system with embedded insulators. This method involves adding an adjustable inductor to the system, determining the relationship between the system input phase angle and the inductance value of the adjustable inductor based on a system equivalent model constructed from the system's circuit model, and thereby determining the number of turns of the adjustable inductor coil. Adjusting the adjustable inductor then enables dynamic tuning of the multi-stage magnetic resonant wireless power transmission system. This solves the technical problem of system detuning caused by parameter disturbances in existing wireless power transmission devices.

[0028] The dynamic tuning method for a multi-stage magnetic resonance wireless power transmission system with embedded insulators provided in this invention can reduce the total system loss and increase the system output voltage gain by setting an adjustable inductor in the transmitter and adjusting the adjustable inductor. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1This is a flowchart of a dynamic tuning method for a multi-stage magnetic resonant wireless power transmission system with embedded insulators according to an embodiment of the present invention;

[0031] Figure 2 This is a circuit diagram of a multi-stage magnetic resonant wireless power transmission system with embedded insulators according to an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the structure of a coil with an embedded insulator according to an embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of the system equivalent model according to an embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of the structure of an adjustable inductor according to an embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the inductance value of the adjustable inductor under different parameter combinations in the simulation verification results according to an embodiment of the present invention;

[0036] Figure 7 This is a schematic diagram of the inductance value of the adjustable inductor in the simulation verification results under different parameter combinations after adjusting the resonant capacitor according to an embodiment of the present invention.

[0037] Figure 8 This is a schematic diagram of the dynamic tuning control process according to an embodiment of the present invention;

[0038] Figure 9 This is a phase diagram illustrating system detuning under different parameter combinations without the addition of an adjustable inductor;

[0039] Figure 10 This is a phase diagram of different parameter combinations after adding an adjustable inductor according to an embodiment of the present invention;

[0040] Figure 11 This is a schematic diagram of voltage gain before and after adding an adjustable inductor under different parameter combinations according to an embodiment of the present invention;

[0041] Figure 12 This is a structural block diagram of a dynamic tuning device for a multi-stage magnetic resonance wireless power transmission system with embedded insulators according to an embodiment of the present invention.

[0042] Figure 13 This is a schematic diagram of the structure of a computer-readable storage medium provided according to an embodiment of the present invention;

[0043] Figure 14 This is a schematic diagram of the structure of an electronic device provided according to an embodiment of the present invention. Detailed Implementation

[0044] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0045] The terms "first," "second," "third," "fourth," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0046] According to an embodiment of the present invention, a dynamic tuning method for a multi-stage magnetic resonant wireless power transmission system with embedded insulators is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0047] This embodiment provides a dynamic tuning method for a multi-stage magnetic resonant wireless power transfer system with embedded insulators, which can be used in electronic devices such as computers, mobile phones, and tablets. Figure 1 This is a flowchart of a dynamic tuning method for a multi-stage magnetic resonant wireless power transfer system with embedded insulators according to an embodiment of the present invention. The multi-stage magnetic resonant wireless power transfer system includes an adjustable inductor for adjusting the phase difference at the system's transmitting end, such as... Figure 1 As shown, the method includes the following steps:

[0048] Step S101: Construct an equivalent model of the system based on the circuit model of the multi-stage magnetic resonant wireless power transfer system; specifically, such as... Figure 2As shown, the multi-stage magnetic resonant wireless power transmission system includes a transmitting circuit, a resonant coil, and a receiving circuit connected in sequence, with the transmitting circuit constituting the transmitting end. The transmitting circuit includes an inverter composed of thyristors S1-S4 and a transmitting coil. An adjustable inductor is connected in series in the transmitting coil, which can adjust the phase difference at the transmitting end of the system. Multiple resonant coils are connected in sequence as repeaters. The receiving circuit includes a rectifier composed of diodes D1-D4 and a load R. L Filter capacitor C f And the receiving coil. The transmitting coil, resonant coil, and receiving coil all include coils and resonant capacitors, such as... Figure 2 As shown, L1-L7 are the coil self-inductance, C1-C7 are the capacitances at the system resonant frequency, i.e., the resonant capacitances, and M... ij This represents the mutual inductance between the coils, and R1-R7 are the internal resistances of the coils.

[0049] For example Figure 2 The multi-stage magnetic resonant wireless power transfer system shown converts the alternating current flowing from the energy source into the required direct current voltage V after passing through an AC-DC converter. dc This DC voltage is the system's input voltage V. in The DC voltage enters the inverter, where it generates AC power. Energy is transferred through multiple resonant coils, and the DC power is then rectified and delivered to the load. Adding a resonant coil as a repeater between the transmitting and receiving circuits can extend the transmission distance while maintaining system efficiency or power. Furthermore, the coils in the system are embedded in insulators, achieving both insulation and energy transfer electrical characteristics. Its structure is as follows: Figure 3 As shown.

[0050] In constructing the equivalent model of this multi-stage magnetic resonant wireless power transfer system, it is assumed that all switching elements in the system are lossless ideal switching devices. Since the fundamental frequency component is much larger than the harmonic components generated by the resonant network, the equivalent model of the system can be obtained based on the fundamental frequency analysis method, as shown below. Figure 4 As shown. Based on the equivalent model of this system, the relationship between the output voltage on the inverter side and the system input voltage can be expressed as:

[0051]

[0052] The equivalent load consisting of the rectifier, filter capacitor, and load can be expressed as:

[0053]

[0054] Step S102: Determine the relationship between the system input phase angle and the inductance value of the adjustable inductor at system resonance based on the system equivalent model; specifically, after determining the system equivalent model, at system resonance, the self-inductance of each coil and the resonant capacitance satisfy the following formula requirements:

[0055]

[0056] Meanwhile, assuming that the mutual inductance between adjacent coils is equal, the relationship between the system input phase angle and the inductance value of the adjustable inductor can be obtained.

[0057] Step S103: Determine the number of turns of the adjustable inductor based on the relationship between the system input phase angle and the inductance value of the adjustable inductor, as well as the equivalent magnetoresistive model. Specifically, according to the basic principles of electromagnetism, for an adjustable inductor, an equivalent magnetoresistive model is established based on the magnetic flux path, which allows us to obtain the relationship between the number of turns of the main coil and the inductance value. When the system is in resonance, the system input phase angle difference is zero. Based on the relationship between the system input phase angle and the inductance value of the adjustable inductor, the inductance value of the adjustable inductor can be determined, thereby obtaining the number of turns of the coil.

[0058] Step S104: Adjust the adjustable inductor according to the number of coil turns to dynamically tune the multi-stage magnetic resonant wireless power transfer system. Specifically, after determining the number of coil turns of the adjustable inductor, changing the number of coil turns connected to the system and adjusting the size of the adjustable inductor can change the system impedance, thereby enabling dynamic tuning of the multi-stage magnetic resonant wireless power transfer system.

[0059] The present invention provides a dynamic tuning method for a multi-stage magnetic resonant wireless power transmission system with embedded insulators. This method involves adding an adjustable inductor to the system, determining the relationship between the system input phase angle and the inductance value of the adjustable inductor based on a system equivalent model constructed from the system's circuit model, and thereby determining the number of turns of the adjustable inductor coil. Adjusting the adjustable inductor then enables dynamic tuning of the multi-stage magnetic resonant wireless power transmission system. This solves the technical problem of system detuning caused by parameter disturbances in existing wireless power transmission devices.

[0060] In one embodiment, determining the relationship between the system input phase angle and the inductance value of the adjustable inductor at system resonance based on the system equivalent model includes: determining the relationship between the self-inductance and resonant capacitance of each coil in the system at system resonance based on the system equivalent model; and determining the relationship between the system input phase angle and the inductance value of the adjustable inductor based on the relationship between the self-inductance and resonant capacitance of each coil in the system when the mutual inductance of adjacent coils in the system is equal and the equivalent load of each coil is equal.

[0061] Specifically, to facilitate determining the expression for the system input phase angle, i.e., the relationship between the system input phase angle and the inductance value of the adjustable inductor, it is assumed that the mutual inductance between adjacent coils is equal, and the equivalent loads of the transmitting coil, relay coil, and receiving coil are equal, that is:

[0062] M 12 =M 23 LM 67 =M

[0063] R1=R2=L R7=R

[0064] Based on this, the total impedance and phase of the system are represented as follows:

[0065]

[0066] Where 'a' can be represented by the following formula:

[0067] a=((ωM) 6 +(ωM) 4 (3R 2 +3R·R eq )+(ωMR) 2 (4R·R eq +R 2 )+R eq R 5 ) / ((ωM) 4 (3R+R eq )

[0068] +(ωM) 2 (4R 2 +6R eq )+3(ωM) 2 R eq +R 4 +4R 3 R eq )

[0069] L v Z represents an adjustable inductor. ref This represents the reflected impedance from the resonant coil and secondary coil to the primary coil. a and b represent the real and imaginary parts of the input impedance, respectively. The system input phase angle difference is the phase difference between the voltage and current; therefore, the phase relationship is expressed using the above total impedance expression.

[0070] In one embodiment, the number of turns of the adjustable inductor is determined based on the relationship between the system input phase angle and the inductance value of the adjustable inductor, as well as the reluctance equivalent model, including the following steps:

[0071] Step S201: Based on the reluctance equivalent model, determine the relationship between the number of turns and the inductance of the main coil according to the relationship between the main magnetic flux and the magnetic flux linkage, the number of coil turns, and the inductance. Specifically, as follows... Figure 5 As shown, the adjustable inductor model is a stack of double E-type magnetic cores. Based on the reluctance equivalent model, the magnetic circuit equation is written for the path through which the main magnetic flux flows, and the expression for the main magnetic flux can be obtained:

[0072]

[0073] Among them, R g R1 and R2 represent the equivalent magnetic reluctance of the air gap, magnetic circuit 1, and magnetic circuit 2, respectively, and N ac Indicates the number of coil turns, I ac This indicates the current in the coil.

[0074] The equivalent magnetic reluctance is expressed by the following formula:

[0075]

[0076] l1, l2, l g Let A1, A2, and A2 represent the equivalent magnetic path lengths of magnetic path 1 and magnetic path 2, and the equivalent air gap length, respectively. g These represent the cross-sectional areas of magnetic circuit 1 and magnetic circuit 2, as well as the cross-sectional area of ​​the air gap, respectively. μ g μ represents the air gap permeability. μ1 and μ2 represent the permeability of ferromagnetic materials.

[0077] The relationship between magnetic flux linkage, main magnetic flux, number of coil turns, and inductance determines the number of turns in the main coil, as shown in the following formula:

[0078]

[0079] Considering that the air gap reluctance is much greater than the magnetic circuit reluctance, the formula for calculating the number of turns and inductance of the main coil is:

[0080]

[0081] Step S202: Determine the number of turns of the main coil based on the relationship between the system input phase angle and the inductance value of the adjustable inductor, as well as the relationship between the number of turns of the main coil and the inductance. Specifically, the inductance value of the adjustable inductor when the input phase angle is 0 can be determined based on the relationship between the system input phase angle and the inductance value. Then, the calculated inductance value of the adjustable inductor is substituted into the calculation formula between the number of turns of the main coil and the inductance to obtain the number of turns of the main coil.

[0082] Step S203: Determine the number of turns of the auxiliary coil based on the relationship between the minimum permeability and the maximum magnetic density of the adjustable inductor core. Specifically, since permeability is an inverse function of magnetic density, the minimum permeability μ of the core in the adjustable inductor... 2-min It must correspond to the maximum magnetic density H max To maximize the adjustment range of the adjustable inductor, the following conditions must be met:

[0083]

[0084] After determining the core material required for the experiment, consult the product parameter curves to obtain the corresponding magnetic flux density that maximizes the adjustment range of the adjustable inductor. Then, the formula for calculating the number of turns of the auxiliary coil can be derived as follows:

[0085]

[0086] In the formula I max To account for losses caused by excessive current, a maximum value needs to be set.

[0087] In one embodiment, after determining the number of turns of the adjustable inductor based on the relationship between the system input phase angle and the inductance value of the adjustable inductor, and the equivalent magnetoresistive model, the following steps are further included:

[0088] Step S301: Change the coil parameters in the multi-stage magnetic resonant wireless power transfer system to determine the inductance value of the adjustable inductor when the system is at its resonant point. Specifically, after determining the number of coil turns, it needs to be verified. During verification, the coil parameters in the system are changed, the inductance value of the adjustable inductor is adjusted, and the resonant point of the system is found. Then, it is determined whether the inductance value of the adjustable inductor is less than 0 when the system is at its resonant point. It should be noted that this verification process can be implemented through simulation. Figure 6 As shown, under different parameter combinations, i.e. combinations 1 to 21, when the system is in a resonant state, the inductance value of the adjustable inductor VI is negative.

[0089] Step S302: When the inductance value of the adjustable inductor is less than zero at the system's resonant point, adjust the resonant capacitor of the transmitting coil in the multi-stage magnetic resonant wireless power transmission system. Specifically, if the inductance value of the adjustable inductor is less than zero at the system's resonant point, the size of the resonant capacitor needs to be adjusted; if the inductance value of the adjustable inductor is greater than or equal to zero at the system's resonant point, no adjustment is needed. The size of the resonant capacitor to be adjusted can be calculated based on the following formula:

[0090]

[0091] C1 = C reson -ΔC m

[0092] In the formula, C1 represents the resonant capacitance of the transmitting coil after adjustment; Creson represents the resonant capacitance before adjustment, -ΔC m This indicates the calculated adjustment value.

[0093] Step S303: Redetermine the number of turns of the adjustable inductor coil based on the adjusted resonant capacitor. Specifically, when the resonant capacitor is adjusted, the inductance value of the adjustable inductor also changes accordingly. Then, based on the new inductance value, steps S201 to S203 are used to redetermine the number of turns of the main coil and the number of turns of the auxiliary coil of the adjustable inductor.

[0094] Specifically, after adjusting the resonant capacitor, the corresponding adjustable inductance values ​​under different parameter combinations, i.e., combinations case 1 to case 21, are as follows: Figure 7 As shown, its maximum value Lv_max is 9.21H. To retain a certain margin, the maximum value of 10H is used for the design of the number of turns. The relevant parameters are shown in Table 1:

[0095] Table 1

[0096]

[0097] I max To account for losses caused by excessive current, a maximum value needs to be set, namely I. max =2A. The number of turns in the main coil and the auxiliary coil can be obtained using the formula, as shown in the table above.

[0098] In one embodiment, dynamically tuning the multi-stage magnetic resonant wireless power transfer system by adjusting the adjustable inductor according to the number of coil turns includes: acquiring the voltage and current at the inverter port of the multi-stage magnetic resonant wireless power transfer system; comparing the phase determined based on the voltage and current with a reference phase, generating an adjustment signal based on the comparison result; and adjusting the number of coil turns of the adjustable inductor according to the adjustment signal to dynamically tune the multi-stage magnetic resonant wireless power transfer system.

[0099] Specifically, such as Figure 8 As shown, to achieve dynamic tuning, this multi-stage magnetic resonant wireless power transfer system also includes a phase detection circuit, a PI controller, and a Buck circuit. The phase detection circuit collects the voltage and current at the inverter output port for phase detection, then compares the detected phase with a reference phase (the reference phase value is 0). The difference between the detected phase and the reference phase is used as the input to the PI controller. The PI controller outputs a PWM waveform signal based on this difference, which is then used as a MOSFET drive signal input to the Buck circuit. The Buck circuit changes the current in the auxiliary coil based on this drive signal. Adjusting the adjustable inductor changes the system impedance, thereby achieving dynamic tuning of the multi-stage magnetic resonant wireless power transfer system. Alternatively, dynamic tuning can also be achieved by adjusting the adjustable inductor through software control or other methods.

[0100] In one embodiment, the dynamic tuning method for the multi-stage magnetic resonant wireless power transmission system with embedded insulators further includes: determining the system output voltage gain expression according to the definition of voltage gain; and calculating the output voltage gain changes when the coil self-inductance in the system is changed, using adjustable inductance adjustment and not using adjustable inductance adjustment, according to the output voltage gain expression.

[0101] Specifically, a multi-stage magnetic resonant wireless power transfer system employs a seven-coil structure, including a transmitting coil, a receiving coil, and five repeater coils, with no adjustable inductor in the transmitting coil. Capacitors are tuned to the system's resonant frequency, ensuring each coil is in resonance. The system frequency is 350kHz, RL represents the load (40Ω), the equivalent internal resistance of the coils R1-R7 is 0.2Ω, the self-inductance of the coils L1-L7 is 41.2μH, and the resonant capacitors C1-C7 are 5.015nF. The DC input voltage is 15V. To simulate changes in system parameters, the self-inductance of any two coils among the seven coils is arbitrarily changed, resulting in a phase difference between the input voltage and current as shown below. Figure 9 As shown in the diagram, it can be seen that with different parameter combinations, i.e., combinations 1 to 21, the input phase angle varies considerably, meaning the system is not always in a resonant state. When an adjustable inductor is set in the system, adjusting the adjustable inductor, as shown... Figure 10 As shown, the phase difference between voltage and current is close to zero, the input phase angle is zero, the total impedance is zero, and the system can operate in a resonant state.

[0102] Furthermore, when an adjustable inductor is set in the system, based on the definition of voltage gain, the expression for the system output voltage gain at system resonance is as follows:

[0103]

[0104] If the coupling relationship between each coil is equivalent to a controlled source, then the calculation formula for I7 is derived in the secondary structure, where I7 is the system output current.

[0105]

[0106] Based on the above formula and design parameters, the changes in voltage gain are calculated when the coil self-inductance parameters are changed, with and without an adjustable inductor. The results are as follows. Figure 11 As shown in the figure, it can be seen that after adding the adjustable inductor VI, the voltage gain Gain is significantly improved under different parameter combinations, i.e., combinations 1 to 21.

[0107] The dynamic tuning method for a multi-stage magnetic resonance wireless power transmission system with embedded insulators provided in this invention can reduce the total system loss and increase the system output voltage gain by setting an adjustable inductor in the transmitter and adjusting the adjustable inductor.

[0108] This invention also provides a dynamic tuning system for a multi-stage magnetic resonant wireless power transfer system embedded with an insulator, comprising: a microprocessor and a transmitting circuit, a resonant coil, and a receiving circuit connected in sequence. The transmitting circuit includes an adjustable inductor. The sequentially connected transmitting circuit, resonant coil, and receiving circuit are used for energy transmission. The microprocessor constructs an equivalent model of the system based on the circuit model of the sequentially connected transmitting circuit, resonant coil, and receiving circuit; determines the relationship between the system input phase angle and the inductance value of the adjustable inductor when the system resonates based on the equivalent model; determines the number of coil turns of the adjustable inductor based on the relationship between the system input phase angle and the inductance value of the adjustable inductor and the magnetoresistive equivalent model; and adjusts the adjustable inductor according to the number of coil turns to dynamically tune the multi-stage magnetic resonant wireless power transfer system.

[0109] The multi-stage magnetic resonant wireless power transmission system with embedded insulators provided in this invention features a dynamic tuning system. By adding an adjustable inductor to the system, and constructing an equivalent system model based on the system's circuit model to determine the relationship between the system input phase angle and the inductance value of the adjustable inductor, the number of coil turns of the adjustable inductor is determined. Adjusting the adjustable inductor then enables dynamic tuning of the multi-stage magnetic resonant wireless power transmission system. This solves the technical problem of system detuning caused by parameter disturbances in existing wireless power transmission devices.

[0110] Optionally, the microprocessor is further configured to determine the relationship between the self-inductance and resonant capacitance of each coil in the system at system resonance based on the system equivalent model; when the mutual inductance of adjacent coils in the system is equal and the equivalent load of each coil is equal, the microprocessor determines the relationship between the system input phase angle and the inductance value of the adjustable inductor based on the relationship between the self-inductance and resonant capacitance of each coil in the system.

[0111] Optionally, the microprocessor is further configured to determine the relationship between the number of turns and the inductance of the main coil based on the magnetoresistive equivalent model, according to the relationship between the main magnetic flux and the magnetic flux linkage, the number of coil turns, and the inductance; determine the number of turns of the main coil based on the relationship between the system input phase angle and the inductance value of the adjustable inductor, as well as the relationship between the number of turns and the inductance of the main coil; and determine the number of turns of the auxiliary coil based on the relationship between the minimum permeability and the maximum magnetic density of the adjustable inductor core.

[0112] Optionally, the microprocessor is further configured to change the coil parameters in the multi-stage magnetic resonant wireless power transmission system, determine the inductance value of the adjustable inductor when the system is at the resonant point; when the inductance value of the adjustable inductor is less than zero when the system is at the resonant point, adjust the resonant capacitance of the transmitting coil in the multi-stage magnetic resonant wireless power transmission system; and redetermine the number of coil turns of the adjustable inductor based on the adjusted resonant capacitance.

[0113] Optionally, the microprocessor is further configured to acquire the voltage and current at the inverter port of the multi-stage magnetic resonant wireless power transfer system; compare the phase determined based on the voltage and current with a reference phase; generate an adjustment signal based on the comparison result; and adjust the number of turns of the adjustable inductor coil according to the adjustment signal to dynamically tune the multi-stage magnetic resonant wireless power transfer system.

[0114] Optionally, the microprocessor is further configured to determine the system output voltage gain expression according to the definition of voltage gain; and to calculate the output voltage gain change when the coil self-inductance in the system is changed, using adjustable inductance regulation and not using adjustable inductance regulation, according to the output voltage gain expression.

[0115] For a detailed description of the function of the dynamic tuning system of the multi-stage magnetic resonance wireless power transmission system with embedded insulators provided in the embodiments of the present invention, please refer to the description of the dynamic tuning method of the multi-stage magnetic resonance wireless power transmission system with embedded insulators in the above embodiments.

[0116] This invention also provides a dynamic tuning device for a multi-stage magnetic resonant wireless power transmission system embedded with an insulator. The multi-stage magnetic resonant wireless power transmission system includes an adjustable inductor for adjusting the phase difference at the system's transmitting end, such as... Figure 12 As shown, the dynamic tuning device includes:

[0117] The model building module is used to build an equivalent model of the system based on the circuit model of the multi-stage magnetic resonance wireless power transmission system; for details, please refer to the corresponding part of the above method embodiment, which will not be repeated here.

[0118] The relationship determination module is used to determine the relationship between the system input phase angle and the inductance value of the adjustable inductor when the system is in resonance, based on the system equivalent model; for details, please refer to the corresponding part of the above method embodiment, which will not be repeated here.

[0119] The coil turns determination module is used to determine the coil turns of the adjustable inductor based on the relationship between the system input phase angle and the inductance value of the adjustable inductor, as well as the magnetoresistive equivalent model; for details, please refer to the corresponding part of the above method embodiment, which will not be repeated here.

[0120] The tuning module is used to adjust the adjustable inductance according to the number of coil turns, thereby dynamically tuning the multi-stage magnetic resonant wireless power transmission system. For details, please refer to the corresponding sections of the above method embodiments, which will not be repeated here.

[0121] The dynamic tuning device for a multi-stage magnetic resonant wireless power transmission system with embedded insulators provided in this invention addresses the relationship between the system input phase angle and the inductance value of the adjustable inductor by adding an adjustable inductor to the system and constructing an equivalent system model based on the system's circuit model. This determines the number of turns in the adjustable inductor's coil. Adjusting the adjustable inductor then enables dynamic tuning of the multi-stage magnetic resonant wireless power transmission system. This solves the technical problem of system detuning caused by parameter disturbances in existing wireless power transmission devices.

[0122] Optionally, the relationship determination module is specifically used to determine the relationship between the self-inductance and resonant capacitance of each coil in the system when the system is in resonance, based on the system equivalent model; when the mutual inductance of adjacent coils in the system is equal and the equivalent load of each coil is equal, the relationship between the system input phase angle and the inductance value of the adjustable inductor is determined based on the relationship between the self-inductance and resonant capacitance of each coil in the system.

[0123] Optionally, the coil turns determination module is specifically used to determine the relationship between the number of turns and inductance of the main coil based on the magnetic reluctance equivalent model, according to the relationship between the main magnetic flux and the magnetic flux linkage, the number of coil turns, and the inductance; to determine the number of turns of the main coil based on the relationship between the system input phase angle and the inductance value of the adjustable inductor, as well as the relationship between the number of turns and inductance of the main coil; and to determine the number of turns of the auxiliary coil based on the relationship between the minimum permeability and the maximum magnetic density of the adjustable inductor core.

[0124] Optionally, the dynamic tuning device for the multi-stage magnetic resonant wireless power transmission system with embedded insulators further includes: a judgment module, used to change the coil parameters in the multi-stage magnetic resonant wireless power transmission system and judge the inductance value of the adjustable inductor when the system is at the resonance point; an adjustment module, used to adjust the resonant capacitance of the transmitting coil in the multi-stage magnetic resonant wireless power transmission system when the inductance value of the adjustable inductor is less than zero when the system is at the resonance point; and a turns adjustment module, used to redetermine the coil turns of the adjustable inductor based on the adjusted resonant capacitance.

[0125] Optionally, the tuning module is specifically used to collect the voltage and current of the inverter port in the multi-stage magnetic resonant wireless power transmission system; compare the phase determined based on the voltage and current with a reference phase, generate an adjustment signal based on the comparison result; and adjust the number of turns of the adjustable inductor coil according to the adjustment signal to dynamically tune the multi-stage magnetic resonant wireless power transmission system.

[0126] Optionally, the dynamic tuning device for the multi-stage magnetic resonance wireless power transmission system with embedded insulators further includes: a gain determination module, used to determine the system output voltage gain expression according to the definition of voltage gain; and a change determination module, used to calculate the output voltage gain change when the coil self-inductance in the system is changed, with and without adjustable inductance adjustment, according to the output voltage gain expression.

[0127] For a detailed description of the function of the dynamic tuning device for the multi-stage magnetic resonance wireless power transmission system with embedded insulators provided in this embodiment of the invention, please refer to the description of the dynamic tuning method for the multi-stage magnetic resonance wireless power transmission system with embedded insulators in the above embodiments.

[0128] This invention also provides a storage medium, such as... Figure 13 As shown, a computer program 601 is stored on it. When executed by a processor, this program implements the steps of the dynamic tuning method for the multi-stage magnetic resonant wireless power transmission system with embedded insulators in the above embodiments. The storage medium also stores audio and video stream data, feature frame data, interactive request signaling, encrypted data, and preset data sizes. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk drive (HDD), or solid-state drive (SSD), etc.; the storage medium may also include combinations of the above types of memory.

[0129] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk drive (HDD), or solid-state drive (SSD), etc.; the storage medium can also include combinations of the above types of memory.

[0130] This invention also provides an electronic device, such as... Figure 14 As shown, the electronic device may include a processor 51 and a memory 52, wherein the processor 51 and the memory 52 may be connected via a bus or other means. Figure 14 Taking the example of a connection between China and Israel via a bus.

[0131] Processor 51 can be a central processing unit (CPU). Processor 51 can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or combinations of the above types of chips.

[0132] The memory 52, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as the corresponding program instructions / modules in the embodiments of the present invention. The processor 51 executes various functional applications and data processing by running the non-transitory software programs, instructions, and modules stored in the memory 52, thereby realizing the dynamic tuning method of the multi-stage magnetic resonant wireless power transmission system with embedded insulators in the above method embodiments.

[0133] The memory 52 may include a program storage area and a data storage area. The program storage area may store applications required for operating the device and at least one function; the data storage area may store data created by the processor 51, etc. Furthermore, the memory 52 may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 52 may optionally include memory remotely located relative to the processor 51, and these remote memories may be connected to the processor 51 via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0134] The one or more modules are stored in the memory 52, and when executed by the processor 51, they perform the following: Figure 1 The embodiment shown illustrates a dynamic tuning method for a multi-stage magnetic resonant wireless power transmission system with embedded insulators.

[0135] For specific details regarding the aforementioned electronic devices, please refer to the relevant documentation. Figure 1 The relevant descriptions and effects in the illustrated embodiments are for understanding purposes only and will not be repeated here.

[0136] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A dynamic tuning method for a multi-stage magnetic resonant wireless power transfer system with embedded insulators, characterized in that, The multi-stage magnetic resonant wireless power transmission system includes an adjustable inductor for adjusting the phase difference at the system's transmitting end, and the dynamic tuning method includes: Construct an equivalent model of the system based on the circuit model of the multi-stage magnetic resonant wireless power transfer system; The relationship between the system input phase angle and the inductance value of the adjustable inductor at system resonance is determined based on the system equivalent model. The number of coil turns of the adjustable inductor is determined based on the relationship between the system input phase angle and the inductance value of the adjustable inductor, as well as the magnetoresistive equivalent model. The multi-stage magnetic resonant wireless power transmission system is dynamically tuned by adjusting the adjustable inductor according to the number of coil turns. The relationship between the system input phase angle and the inductance value of the adjustable inductor at system resonance is determined based on the system equivalent model, including: The relationship between the self-inductance and resonant capacitance of each coil in the system at resonance is determined based on the equivalent model of the system. When the mutual inductance of adjacent coils in the system is equal and the equivalent load of each coil is equal, the relationship between the system input phase angle and the inductance value of the adjustable inductor is determined based on the relationship between the self-inductance and the resonant capacitance of each coil in the system. The number of turns of the adjustable inductor is determined based on the relationship between the system input phase angle and the inductance value of the adjustable inductor, as well as the equivalent reluctance model. Based on the magnetoresistive equivalent model, the relationship between the main coil turns and the inductance is determined according to the relationship between the main magnetic flux and the magnetic flux linkage, the main magnetic flux, the number of coil turns, and the inductance. The number of turns of the main coil is determined based on the relationship between the system input phase angle and the inductance value of the adjustable inductor, as well as the relationship between the number of turns of the main coil and the inductance. The number of turns of the auxiliary coil is determined based on the relationship between the minimum permeability and the maximum magnetic density of the adjustable inductor core.

2. The dynamic tuning method for a multi-stage magnetic resonant wireless power transfer system with embedded insulators according to claim 1, characterized in that, After determining the number of turns of the adjustable inductor based on the relationship between the system input phase angle and the inductance value of the adjustable inductor, and using the reluctance equivalent model, the following steps are also included: By changing the coil parameters in the multi-stage magnetic resonance wireless power transmission system, the inductance value of the adjustable inductor when the system is at the resonance point is determined. When the system is at the resonant point, if the inductance value of the adjustable inductor is less than zero, adjust the resonant capacitance of the transmitting coil in the multi-stage magnetic resonant wireless power transmission system. The number of turns of the adjustable inductor coil is re-determined based on the adjusted resonant capacitor.

3. The dynamic tuning method for a multi-stage magnetic resonant wireless power transfer system with embedded insulators according to claim 1, characterized in that, The multi-stage magnetic resonant wireless power transmission system is dynamically tuned by adjusting the adjustable inductor according to the number of coil turns, including: Collect the voltage and current at the inverter port of the multi-stage magnetic resonant wireless power transmission system; The phase determined based on the voltage and current is compared with a reference phase, and an adjustment signal is generated based on the comparison result. The number of coil turns of the adjustable inductor is adjusted according to the adjustment signal to dynamically tune the multi-stage magnetic resonance wireless power transmission system.

4. The dynamic tuning method for a multi-stage magnetic resonant wireless power transfer system with embedded insulators according to claim 1, characterized in that, Also includes: Determine the expression for the system output voltage gain based on the definition of voltage gain; The output voltage gain changes when the coil self-inductance in the system is changed, based on the aforementioned output voltage gain expression, are calculated using adjustable inductance regulation and without adjustable inductance regulation.

5. A dynamic tuning system for a multi-stage magnetic resonant wireless power transfer system with embedded insulators, characterized in that, include: The system includes a microprocessor and a transmitting circuit, a resonant coil, and a receiving circuit connected in sequence. The transmitting circuit includes an adjustable inductor for adjusting the phase difference at the transmitting end of the system. The sequentially connected transmitting circuit, resonant coil, and receiving circuit are used for energy transfer. The microprocessor constructs an equivalent system model based on the circuit model of the sequentially connected transmitting circuit, resonant coil, and receiving circuit; it determines the relationship between the system input phase angle and the inductance value of the adjustable inductor when the system resonates based on the equivalent system model; it determines the number of coil turns of the adjustable inductor based on the relationship between the system input phase angle and the inductance value of the adjustable inductor and the magnetoresistive equivalent model; and it adjusts the adjustable inductor according to the number of coil turns to dynamically tune the multi-stage magnetic resonant wireless power transmission system. The microprocessor is also used to determine the relationship between the self-inductance and resonant capacitance of each coil in the system when the system is in resonance, based on the equivalent model of the system; when the mutual inductance of adjacent coils in the system is equal and the equivalent load of each coil is equal, the microprocessor determines the relationship between the system input phase angle and the inductance value of the adjustable inductor based on the relationship between the self-inductance and resonant capacitance of each coil in the system. The microprocessor is also used to determine the relationship between the number of turns and the inductance of the main coil based on the magnetoresistive equivalent model, according to the relationship between the main magnetic flux and the magnetic flux linkage, the number of coil turns, and the inductance; to determine the number of turns of the main coil based on the relationship between the system input phase angle and the inductance value of the adjustable inductor, as well as the relationship between the number of turns and the inductance of the main coil; and to determine the number of turns of the auxiliary coil based on the relationship between the minimum permeability and the maximum magnetic density of the adjustable inductor core.

6. The dynamic tuning system of the multi-stage magnetic resonant wireless power transmission system with embedded insulators according to claim 5, characterized in that, The microprocessor is also used to change the coil parameters in the multi-stage magnetic resonance wireless power transmission system, determine the inductance value of the adjustable inductor when the system is at the resonance point; when the inductance value of the adjustable inductor is less than zero when the system is at the resonance point, adjust the resonant capacitance of the transmitting coil in the multi-stage magnetic resonance wireless power transmission system; and redetermine the number of coil turns of the adjustable inductor based on the adjusted resonant capacitance.

7. The dynamic tuning system of the multi-stage magnetic resonant wireless power transmission system with embedded insulators according to claim 5, characterized in that, The microprocessor is also used to acquire the voltage and current of the inverter port in the multi-stage magnetic resonance wireless power transmission system; compare the phase determined based on the voltage and current with a reference phase, generate an adjustment signal based on the comparison result; and adjust the number of turns of the adjustable inductor coil according to the adjustment signal to dynamically tune the multi-stage magnetic resonance wireless power transmission system.

8. The dynamic tuning system of the multi-stage magnetic resonant wireless power transmission system with embedded insulators according to claim 5, characterized in that, The microprocessor is also used to determine the system output voltage gain expression according to the definition of voltage gain; and to calculate the output voltage gain change when the coil self-inductance in the system is changed, using adjustable inductance adjustment and not using adjustable inductance adjustment, according to the output voltage gain expression.

9. A dynamic tuning device for a multi-stage magnetic resonant wireless power transmission system with embedded insulators, characterized in that, include: The multi-stage magnetic resonant wireless power transmission system includes an adjustable inductor for adjusting the phase difference at the system's transmitting end, and the dynamic tuning device includes: The model building module is used to build an equivalent model of the system based on the circuit model of the multi-stage magnetic resonant wireless power transfer system. The relationship determination module is used to determine the relationship between the system input phase angle and the inductance value of the adjustable inductor when the system is at resonance, based on the system equivalent model. The coil turns determination module is used to determine the coil turns of the adjustable inductor based on the relationship between the system input phase angle and the inductance value of the adjustable inductor, as well as the magnetoresistive equivalent model. The tuning module is used to adjust the adjustable inductance according to the number of coil turns to dynamically tune the multi-stage magnetic resonant wireless power transmission system. The relationship determination module is specifically used to determine the relationship between the self-inductance and resonant capacitance of each coil in the system when the system is in resonance, based on the system equivalent model; when the mutual inductance of adjacent coils in the system is equal and the equivalent load of each coil is equal, the relationship between the system input phase angle and the inductance value of the adjustable inductor is determined based on the relationship between the self-inductance and resonant capacitance of each coil in the system. The coil turns determination module is specifically used to determine the relationship between the number of turns and inductance of the main coil based on the magnetoresistive equivalent model, according to the relationship between the main magnetic flux and the magnetic flux linkage, the number of coil turns, and the inductance; to determine the number of turns of the main coil based on the relationship between the system input phase angle and the inductance value of the adjustable inductor, as well as the relationship between the number of turns and inductance of the main coil; and to determine the number of turns of the auxiliary coil based on the relationship between the minimum permeability and the maximum magnetic density of the adjustable inductor core.

10. The dynamic tuning device for a multi-stage magnetic resonant wireless power transmission system with an embedded insulator according to claim 9, characterized in that, Also includes: The judgment module is used to change the coil parameters in the multi-stage magnetic resonance wireless power transmission system and determine the inductance value of the adjustable inductor when the system is at the resonance point. An adjustment module is used to adjust the resonant capacitance of the transmitting coil in the multi-stage magnetic resonance wireless power transmission system when the inductance value of the adjustable inductor is less than zero at the system's resonant point. The turns adjustment module is used to redetermine the number of coil turns of the adjustable inductor based on the adjusted resonant capacitor.

11. The dynamic tuning device for a multi-stage magnetic resonant wireless power transmission system with an embedded insulator according to claim 9, characterized in that, The tuning module is specifically used to collect the voltage and current at the inverter port of the multi-stage magnetic resonance wireless power transmission system; compare the phase determined based on the voltage and current with a reference phase, generate an adjustment signal based on the comparison result; and adjust the number of turns of the adjustable inductor coil according to the adjustment signal to dynamically tune the multi-stage magnetic resonance wireless power transmission system.

12. The dynamic tuning device for a multi-stage magnetic resonant wireless power transmission system with an embedded insulator according to claim 9, characterized in that, Also includes: The gain determination module is used to determine the system output voltage gain expression based on the definition of voltage gain. The change determination module is used to calculate the change in output voltage gain when the coil self-inductance in the system is changed, with and without adjustable inductance regulation, based on the output voltage gain expression.

13. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing the computer to execute the dynamic tuning method for a multi-stage magnetic resonant wireless power transfer system with embedded insulators as described in any one of claims 1-4.

14. An electronic device, characterized in that, include: The system includes a memory and a processor, which are communicatively connected to each other. The memory stores computer instructions, and the processor executes the computer instructions to perform the dynamic tuning method for a multi-stage magnetic resonant wireless power transmission system with embedded insulators as described in any one of claims 1-4.

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