Adaptive wpt system and method based on symmetric anti-resonance-resonance

Abstract

The application relates to a self-adaptive WPT system and method based on a symmetric anti-resonance-resonance, which comprises an anti-resonance-resonance structure, an anti-resonance structure at a transmitting end and a resonant structure at a receiving end, the anti-resonance structure comprises a first resonant unit and a second resonant unit which are coupled to each other, the resonant structure comprises a third resonant unit which can be coupled to the near field of the second resonant unit, the third resonant unit is connected with a load, and the anti-resonance-resonance structure is configured to satisfy; a controllable gain module is connected between a power supply and the anti-resonance structure, and is used for dynamically adjusting the input voltage value transmitted to the anti-resonance structure, so that the system is kept. The application can adaptively track the BIC condition in the mode of adjusting the electrical parameters of the circuit, the control method is simple and easy to realize, and can be used for complex and changeable application scenes.

Description

Technical Field

[0001] This invention relates to the field of wireless power transfer technology, and in particular to an adaptive WPT system and method based on symmetric anti-resonance-resonance. Background Technology

[0002] Wireless power transfer (WPT) technology has received widespread attention and application in recent years in fields such as consumer electronics, electric vehicles, robotics, and implantable medical devices. Traditional magnetic resonance WPT systems (such as the published patent CN102255398A) typically use two resonant coils for energy coupling, offering advantages such as long transmission distance and high efficiency. However, with increasingly complex application scenarios, traditional WPT systems have revealed many shortcomings in terms of stability, transmission efficiency, and frequency robustness.

[0003] First, traditional magnetic resonance WPT systems suffer from "frequency splitting." When the distance between the transmitting and receiving coils changes, the system coupling strength changes accordingly, causing the system's intrinsic frequencies to split and significantly reducing transmission efficiency. To address this, existing technologies typically introduce frequency tracking circuits to maintain efficient transmission by adjusting the operating frequency in real time. However, frequency tracking circuits are complex in structure, contain numerous components, have poor system stability, and are prone to failure in high-power scenarios, severely impacting system reliability.

[0004] Secondly, WPT systems based on parity-time (PT) symmetry have been proposed to address the problems associated with frequency tracking. PT-symmetric systems achieve real eigenvalues ​​within a certain coupling strength range by introducing a balance between gain and loss, thereby ensuring stable system operating frequency. However, PT-symmetric systems have stringent operating conditions; gain and loss must be precisely matched. Once PT symmetry is broken, the system eigenvalues ​​become complex, and transmission efficiency drops sharply, making it difficult to adapt to diverse real-world application scenarios.

[0005] Furthermore, in recent years, WPT systems based on anti-parity-time (Anti-PT) symmetry have been proposed, such as the multi-load wireless power transfer system based on high-order Anti-PT symmetry in application number CN202211389897.2. By introducing a "W-type" anti-resonance structure, the Anti-PT symmetric system can achieve the "level pinning" effect, fixing the system's intrinsic frequency to the center frequency, avoiding frequency splitting, and improving system stability. However, satisfying Anti-PT symmetry requires special coil structures such as synthesis dimension to achieve natural matching of coupling coefficients at a specific operating point, and requires a high degree of consistency in the structure and parameters of each resonant unit. Even a small deviation will break the condition of equal coupling coefficients, making adjustment too difficult and difficult to achieve. Summary of the Invention

[0006] To address the aforementioned issues, this invention provides an adaptive WPT system and method based on symmetrical anti-resonance-resonance. This system can dynamically adjust the gain rate by regulating electrical parameters through the circuit, enabling the system to adaptively track BIC conditions according to load changes. This significantly improves the system's environmental adaptability and robustness, and the control method is simple and easy to implement.

[0007] This invention is achieved through the following scheme: an adaptive WPT system based on symmetric anti-resonance-resonance, comprising:

[0008] An anti-resonance-resonance structure includes an anti-resonance structure at the transmitting end and a resonant structure at the receiving end. The anti-resonance structure includes a first resonant unit and a second resonant unit coupled to each other. The resonant structure includes a third resonant unit that can be near-field coupled to the second resonant unit. The third resonant unit is connected to a load, and the anti-resonance-resonance structure is configured to satisfy... ;

[0009] A controllable gain module, connected between the power supply and the anti-resonance structure, is used to dynamically adjust the input voltage value transmitted to the anti-resonance structure to maintain the system's stability. ;

[0010] in, This is expressed as the gain rate at the system's transmitting end; This is expressed as the loss rate at the system receiver. This is expressed as the coupling rate between the first resonant unit and the second resonant unit; This represents the coupling rate between the second and third resonant units.

[0011] A further improvement of the system of the present invention is that a detection point is provided between the controllable gain module and the anti-resonance structure, and / or between the resonant structure and the load. The system also includes a detection module for real-time detection of electrical quantities at the detection point and feedback to the controllable gain module.

[0012] A further improvement of the system of the present invention is that the detection point is located at the first resonant unit. When the first resonant unit and the second resonant unit are inductively coupled, the electrical quantity is the coil current or mutual inductance; when the first resonant unit and the second resonant unit are capacitively coupled, the electrical quantity is the plate voltage or capacitive reactance.

[0013] A further improvement of the system of the present invention is that the controllable gain module includes an inverter circuit, a drive unit, and a control chip. The inverter circuit is connected between the power supply and the anti-resonance structure and is used to invert DC to AC. The drive unit is connected to the inverter circuit and controlled by the control chip. The control chip is used to acquire the electrical quantity and dynamically control the drive unit according to the change of the electrical quantity to adjust the AC voltage value output by the inverter circuit.

[0014] A further improvement of the system of the present invention is that the inverter circuit is any one of a full-bridge inverter circuit, a half-bridge inverter circuit, a full-bridge LLC circuit, a half-bridge LLC circuit, and a phase-shifted full-bridge circuit.

[0015] A further improvement of the system of the present invention is that the resonant structure further includes a compensation element connected to the third resonant unit to form a compensation network circuit.

[0016] An adaptive WPT method based on symmetric anti-resonance-resonance includes the following steps:

[0017] S1. Provide the adaptive WPT system based on symmetric anti-resonance-resonance as described above;

[0018] S2. During wireless power transmission using the system, the input voltage value is adjusted using a controllable gain module, and the system is kept in a constant state. .

[0019] This invention includes, but is not limited to, the following beneficial effects:

[0020] 1. This invention can dynamically adjust the gain rate by adjusting electrical parameters through circuitry, enabling the system to adaptively track BIC (Bound state in the continuum) conditions according to load changes during energy transmission. This allows the system to meet a wider range of BIC conditions, achieving efficient and stable transmission at the center frequency, significantly improving the system's environmental adaptability and robustness. Furthermore, the control method is simple and easy to implement, making it suitable for complex and ever-changing application scenarios. It overcomes the shortcomings of existing technologies and meets the urgent needs of future intelligent devices for wireless power transmission technology.

[0021] 2. By employing an anti-resonance-resonance WPT system, the efficiency of coupling naturally decreases more slowly than that of a dual-resonance WPT system when the distance to the receiver changes, and it also naturally has the effect of field strength suppression. Attached Figure Description

[0022] Figure 1 A block diagram of the adaptive WPT system is shown.

[0023] Figure 2A physical model diagram of the anti-resonance-resonance WPT system is shown.

[0024] Figure 3 The equivalent circuit model diagram of the anti-resonance-resonance WPT system under five compensation networks is shown.

[0025] Figure 4 The circuit diagram of a controllable full-bridge inverter is shown.

[0026] Figure 5 The PWM waveform with a duty cycle of 10% is shown.

[0027] Figure 6 The PWM waveform with a duty cycle of 50% is shown.

[0028] Figure 7 A schematic diagram comparing the field strength of the transmitting and receiving coils of a conventional resonant-resonant WPT system and the anti-resonant-resonant WPT system of the present invention is shown. Detailed Implementation

[0029] To address the challenge of maintaining stable and efficient transmission in complex and ever-changing application scenarios using existing WPT systems, this invention provides an adaptive WPT system and method based on symmetric anti-resonance-resonance. This system dynamically adjusts the gain rate by regulating electrical parameters through circuitry, enabling it to adaptively track BIC conditions based on load changes. This significantly improves the system's environmental adaptability and robustness, and the control method is simple and easy to implement. The following detailed description, in conjunction with the accompanying drawings, further illustrates this adaptive WPT system and method based on symmetric anti-resonance-resonance.

[0030] See Figures 1-7 As shown, an adaptive WPT system based on symmetric anti-resonance-resonance includes an anti-resonance-resonance structure and a controllable gain module.

[0031] This anti-resonance-resonance structure, when connected between the power supply and the load, can form an anti-resonance-resonance WPT system, such as... Figure 2 As shown, in the system, the anti-resonance-resonance structure includes an anti-resonance structure located at the transmitting end and a resonance structure located at the receiving end. The anti-resonance structure includes a first resonant unit 1 and a second resonant unit 2 that are coupled to each other. The coupling between the two is virtual, and the coupling coefficient is [value missing]. The resonant structure includes a third resonant unit 3 that can be near-field coupled to the second resonant unit 2; the two are physically coupled with a coupling coefficient of [value missing]. The second resonant unit 3 is connected to the load. The coupling form between the first resonant unit 1 and the second resonant unit 2 in this anti-resonance structure has diverse characteristics and can be flexibly selected according to application requirements, specifically including inductive coupling and capacitive coupling. The inductive coupling form can use two independent coils to form an inductive coupling structure, achieving energy transfer through magnetic field induction between the coils. Alternatively, a lumped transformer coupling can be used, utilizing the coupling characteristics of the primary and secondary windings of the transformer to improve the directionality and efficiency of energy transmission, suitable for short-distance, high-power transmission scenarios. The capacitive coupling form further includes two forms: lumped capacitance coupling and distributed capacitance coupling. Lumped capacitance coupling constructs the coupling path through external independent capacitor elements. Distributed capacitance coupling utilizes the distributed capacitance formed by two parallel plates to achieve energy transfer, requiring no additional discrete components, resulting in a more compact structure suitable for miniaturized, low-power electronic devices. The anti-resonance structure and the resonant structure form different anti-resonance-resonance structures by adapting different coupling forms, for example:

[0032] 1. Use inductive coupling (independent coil), such as... Figure 3 As shown: The first resonant unit 1 includes a first inductor connected in parallel. (i.e., lumped inductance) and the first capacitor The second resonant unit 2 includes a second inductor connected in parallel. (i.e., the transmitting resonant coil) and the second capacitor The first resonant unit 1 and the second resonant unit 2 are connected by a coupling capacitor. Coupling is performed; the third resonant unit 3 consists of a receiving end resonant coil. and the third capacitor Parallel connection, receiving end resonant coil Coupled with the transmitting resonant coil, the coupling coefficient κ is the coupling coefficient between the second resonant unit 2 and the third resonant unit 3. First capacitor Second capacitor and the third capacitor All of them are resonant capacitors.

[0033] 2. Inductive coupling (lumped transformer): The anti-resonance structure consists of the primary winding of the lumped transformer (equivalent to the first inductor). ) and secondary winding (equivalent second inductor) And the first capacitor is connected in parallel. Second capacitor The third resonant unit 3 is composed of a receiving end resonant coil. and the third capacitor It is composed of parallel connections.

[0034] 3. Use capacitive coupling (lumped capacitance): In the anti-resonance structure, connect lumped coupling capacitors in series / parallel to replace part of the inductive coupling structure, forming a capacitor-dominated anti-resonance coupling path. This path, along with the third resonant unit of the receiving end resonant structure (including the receiving end resonant coil),... and the third capacitor in parallel )coupling.

[0035] 4. Capacitive Coupling (Distributed Capacitance): Two parallel metal plates are used as the anti-resonance structure at the transmitting end and the resonant structure at the receiving end, respectively. The plates are coupled to the first inductance of the corresponding circuit. Second inductor and the first capacitor Second capacitor A resonant system is constructed, and the energy coupling at the transmitter is achieved by utilizing the distributed capacitance.

[0036] The resonant structure can also be constructed by connecting the third resonant unit with compensation components such as capacitors and inductors to form a compensation network circuit. This ensures system stability, and the compensation network configuration offers diverse characteristics, such as... Figure 3 As shown in the figure, the equivalent circuit diagrams of the S-type compensation network, P-type compensation network, LCL-type compensation network, LCC-type compensation network, and LCCC-type compensation network are displayed from top to bottom. Among them, the inductor... ,capacitance All of these are compensation components. Each resonant unit in the system consists of a high-quality inductor and a resonant capacitor with low equivalent series resistance (ESR), forming a precise LC resonant circuit. The resonant frequency of each circuit is precisely tuned to the system's center frequency. Coupling coefficient It is determined by the mutual inductance M between the coils, and exhibits an exponential decay characteristic as it changes with distance.

[0037] The aforementioned anti-resonance-resonance WPT system can be constructed to satisfy the Anti-PT symmetry condition so that the system operates in BIC mode, as follows:

[0038] In the anti-resonance-resonance WPT system using inductive coupling, the system's equation of motion is:

[0039]

[0040] (Formula 1)

[0041]

[0042] in, ( () represents the complex amplitude of the energy stored in different resonant units. Indicates the amplitude value. ω represents the phase factor, used to describe the phase term of energy oscillation over time, and ω represents the system's intrinsic frequency, ω=2πf, where f is the actual operating frequency; , and This represents the ohmic loss of different resonant units; This is expressed as the gain rate at the system's transmitting end; This is expressed as the loss rate at the system receiver. As the distance between the resonant units increases, they all exhibit an exponential decay characteristic; This represents the complex amplitude of the input wave. When the system satisfies the zero reflection condition... hour, Indicates the complex amplitude of the reflected wave. That is Considering the case without inherent losses, the characteristic equation of the system's eigenvalues ​​can be obtained as follows:

[0043] (Formula 2)

[0044] The equivalent Hamiltonian of the system is expressed as:

[0045] (Formula 3)

[0046] In the anti-resonance-resonance WPT system with capacitive coupling, the system's equation of motion is:

[0047]

[0048] (Formula 4)

[0049]

[0050] When the system satisfies the zero reflection condition, considering the case without intrinsic loss, the characteristic equation of the system's eigenvalues ​​can be obtained as follows:

[0051] (Formula 5)

[0052] The equivalent Hamiltonian of the system is expressed as:

[0053] (Formula 6)

[0054] When the system satisfies the Anti-PT symmetry condition (i.e.) and When the system's intrinsic frequency ω is "pinned" to its inherent center frequency ω0, the system operates in BIC mode, enabling frequency-fixed transmission and effectively avoiding frequency splitting. The derivation and verification of this conclusion are prior art; for details, please refer to the published patent (application number: CN202211389897.2), which will not be elaborated here.

[0055] For the above Anti-PT symmetry conditions The conditions can be met by adapting the hardware structure and parameters (such as through mutual inductance M between coils) when constructing the anti-resonance-resonance structure. For The present invention achieves this condition by introducing a controllable gain module to adjust electrical parameters through circuitry, and the change of these electrical parameters will not affect the coupling coefficient of the predetermined system, provided that the system is built according to the following conditions. The conditions do not change due to variations in electrical parameters; therefore, during wireless power transmission in the system, only adjustments are needed. This allows the system to meet a wider range of BIC conditions, achieving efficient and stable transmission at the center frequency ω0. It significantly improves the system's environmental adaptability and robustness, and the control method is simple and easy to implement, making it suitable for complex and ever-changing application scenarios. It overcomes the shortcomings of existing technologies and meets the urgent needs of future intelligent devices for wireless power transmission technology.

[0056] Specifically: such as Figure 1 and Figure 2 As shown, the controllable gain module is connected between the power supply and the anti-resonance structure (i.e., the first resonant unit 1) to dynamically adjust the input voltage value transmitted to the anti-resonance structure, thereby increasing the system's gain rate. With loss rate To achieve the above dynamic adjustment, detection points need to be set between the controllable gain module and the anti-resonance structure, and / or between the resonant structure and the load. The detection module collects the electrical quantities at the detection points in real time and feeds them back to the detection module of the controllable gain module. In this embodiment, the detection point is set at the first resonant unit. When the first resonant unit and the second resonant unit are inductively coupled, the electrical quantity is the coil current or mutual inductance, which can be detected by a current transformer. The coupling coefficient can be estimated based on the phase difference of the coil current or the change in mutual inductance. When the first resonant unit and the second resonant unit are capacitively coupled, the electrical quantity is the plate voltage or capacitive reactance, which can be detected by a voltage sensor. The coupling strength can be obtained based on the plate voltage change or capacitive reactance characteristics.

[0057] Further reading Figure 4As shown, the controllable gain module includes an inverter circuit, a drive unit, and a control chip. The inverter circuit is connected between the power supply and the anti-resonance structure and is used to invert DC to AC. Any one of the following can be used: a full-bridge inverter circuit, a half-bridge inverter circuit, a full-bridge LLC circuit, a half-bridge LLC circuit, and a phase-shifted full-bridge circuit. Figure 4 The inverter circuit shown is a full-bridge inverter circuit (i.e., a Class D amplifier). This circuit uses four GaN power switches to form a full-bridge structure. This full-bridge inverter circuit is suitable for inductively coupled high-power scenarios, as the GaN switches can improve power capacity. For capacitively coupled low-power scenarios, components adapted to lower power can be used, simplifying the circuit structure and reducing its size. The drive unit is connected to the inverter circuit and controlled by the control chip. The control chip acquires the electrical quantity and dynamically controls the drive unit based on changes in the electrical quantity to adjust the AC voltage value output by the inverter circuit (i.e., the input voltage value to the transmitter of the anti-resonance structure). This example uses a full-bridge inverter circuit and utilizes the control chip and drive unit for control and drive, ensuring that the system can respond to changes in the external environment within milliseconds. By controlling the phase shift of the inverter circuit or adjusting the duty cycle or frequency of the PWM signal, the AC voltage value output by the inverter circuit is affected, thereby achieving precise control of the equivalent gain rate. The purpose. Figure 5 and Figure 6 The PWM waveforms with duty cycles of 10% and 50% are shown respectively. This drive unit can use a dedicated isolated drive chip, which can ensure the accuracy and safety of the switching signals.

[0058] The gain rate of the system can be adjusted by regulating the AC voltage output of the inverter circuit. The principle of regulation is as follows, and will be explained below. Figure 3 The five types of compensation network circuits shown are explained below:

[0059] For S-type compensation networks (i.e.) Figure 3 (The first image in the text)

[0060] The formulas for Kirchhoff's Current Law (KCL) and Voltage Law (KVL) are as follows:

[0061]

[0062]

[0063]

[0064] in, The imaginary unit is used to characterize the phase relationship between voltage and current. These represent the complex current amplitudes of the first, second, and third resonant units, respectively. Represented as the equivalent source resistance at the transmitter; This is represented as the equivalent load resistance at the receiving end.

[0065] According to the above formula, we can see that... The equivalent physical quantity expression is as follows:

[0066] , , ,

[0067] Therefore, the conditional expression for the system to satisfy Anti-PT symmetry can be transformed into:

[0068]

[0069]

[0070] For P-type compensation networks (i.e.) Figure 3 (The second image in the image)

[0071] The formulas for Kirchhoff's Current Law (KCL) and Voltage Law (KVL) are as follows:

[0072]

[0073]

[0074]

[0075] in, This represents the complex amplitude of the voltage at the core node of the receiving end.

[0076] According to the above formula, we can see that... The equivalent physical quantity expression is as follows:

[0077] , , ,

[0078] Therefore, the conditional expression for the system to satisfy Anti-PT symmetry can be transformed into:

[0079]

[0080]

[0081] For LCL type compensation networks (i.e.) Figure 3 (The third picture in the picture)

[0082] The formulas for Kirchhoff's Current Law (KCL) and Voltage Law (KVL) are as follows:

[0083]

[0084]

[0085]

[0086]

[0087] According to the above formula, we can see that... The equivalent physical quantity expression is as follows:

[0088] , , ,

[0089] Therefore, the conditional expression for the system to satisfy Anti-PT symmetry can be transformed into:

[0090]

[0091]

[0092] For LCC type compensation networks (i.e.) Figure 3 (The fourth picture in the picture)

[0093] The formulas for Kirchhoff's Current Law (KCL) and Voltage Law (KVL) are as follows:

[0094]

[0095]

[0096]

[0097]

[0098] According to the above formula, we can see that... The equivalent physical quantity expression is as follows:

[0099] , , ,

[0100] Therefore, the conditional expression for the system to satisfy Anti-PT symmetry can be transformed into:

[0101]

[0102]

[0103] For LCCC type compensation networks (i.e. Figure 3(Fifth picture in the series)

[0104] The formulas for Kirchhoff's Current Law (KCL) and Voltage Law (KVL) are as follows:

[0105]

[0106]

[0107]

[0108]

[0109] According to the above formula, we can see that... The equivalent physical quantity expression is as follows:

[0110] , , ,

[0111] Therefore, the conditional expression for the system to satisfy Anti-PT symmetry can be transformed into:

[0112]

[0113]

[0114] It is quite evident from the conditional expressions for the above systems to satisfy Anti-PT symmetry that... The conditions are mainly related to the system structure and physical parameters. When these conditions are disrupted due to changes in the external working environment, the mutual inductance of the coils can be adjusted. To re-satisfy the condition. When the condition is broken, electrical parameters can be adjusted. To achieve this, according to Ohm's law, the... The gain rate is directly proportional to the transmitter voltage (i.e., the AC voltage output by the controllable gain module). Therefore, by introducing the controllable gain module, the gain rate can be dynamically adjusted by regulating the electrical parameters of the circuit. This allows the system to adaptively track BIC conditions based on changes in the external working environment, such as load, enabling the system to meet a wider range of BIC conditions. In BIC mode, regardless of the coupling form of the anti-resonance structure, the system's intrinsic frequency is locked at the center frequency, eliminating the need for an external frequency tracking circuit. This achieves efficient and stable energy transfer, significantly improving the system's environmental adaptability and robustness. Furthermore, the control method is simple and easy to implement, making it suitable for complex and ever-changing application scenarios. It overcomes the shortcomings of existing technologies and meets the urgent needs of future intelligent devices for wireless power transfer technology.

[0115] An adaptive WPT method based on symmetric anti-resonance-resonance, specifically employing the dynamic BIC adjustment method of this adaptive WPT system: during wireless power transfer using this system, the input voltage value is adjusted using a controllable gain module to achieve the desired gain rate. To equal the loss rate .

[0116] The controllable gain module can be controlled by a high-performance microcontroller (MCU, DSP, FPGA, etc.). The controller incorporates a BIC conditional tracking algorithm adaptable to various coupling configurations. It monitors electrical quantities at detection points in real time via a high-speed ADC channel to accurately estimate the coupling coefficient. Based on the coupling state identification results, the controller runs a BIC tracking algorithm based on model predictive control to dynamically calculate the required gain rate. The optimal value is determined, and the inverter circuit is adjusted in real time by means of phase shifting or changing the duty cycle of the PWM wave.

[0117] Furthermore, this invention employs an anti-resonance-resonance WPT system, which naturally slows down the efficiency degradation of coupling as the distance to the receiver changes compared to a dual-resonance WPT system, and also naturally has a field strength suppression effect. Specifically, as follows... Figure 7 As shown, the upper right figure illustrates a traditional resonant-resonant MC-WPT scheme based on the WiTricity patent (CN102255398A) architecture, where the magnetic field strengths of both coils are very high. The lower right figure shows the novel anti-resonant MC-WPT scheme of this invention. Clearly, the magnetic field of the transmitting coil is completely suppressed, exhibiting a natural field strength suppression effect.

[0118] In summary, the core principle of this invention lies in dynamically establishing and maintaining mode "pinning" characteristics through a combination of precise circuit design and intelligent control algorithms, thereby achieving bound-in-state (BIC) in the continuous domain and obtaining frequency-stable and highly efficient wireless power transfer characteristics. This system overcomes the performance limitations of traditional WPT systems under varying distance and load conditions, realizing truly adaptive power transfer.

[0119] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. Those skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention, and the scope of protection of the present invention shall be defined by the appended claims.

Claims

1. An adaptive WPT system based on symmetric anti-resonance-resonance, characterized in that, include: An anti-resonance-resonance structure includes an anti-resonance structure at the transmitting end and a resonant structure at the receiving end. The anti-resonance structure includes a first resonant unit and a second resonant unit coupled to each other. The resonant structure includes a third resonant unit that can be near-field coupled to the second resonant unit. The third resonant unit is connected to a load, and the anti-resonance-resonance structure is configured to satisfy... ; A controllable gain module, connected between the power supply and the anti-resonance structure, is used to dynamically adjust the input voltage value transmitted to the anti-resonance structure to maintain the system's stability. ; in, This is expressed as the gain rate at the system's transmitting end; This is expressed as the loss rate at the system receiver. This is expressed as the coupling rate between the first resonant unit and the second resonant unit; This represents the coupling rate between the second and third resonant units.

2. The adaptive WPT system based on symmetric anti-resonance as described in claim 1, characterized in that, The controllable gain module and the anti-resonance structure are provided with detection points, and / or the resonance structure and the load are provided with detection points. The system also includes a detection module for real-time detection of electrical quantities at the detection points and feedback to the controllable gain module.

3. The adaptive WPT system based on symmetric anti-resonance as described in claim 2, characterized in that, The detection point is located at the first resonant unit. When the first resonant unit and the second resonant unit are inductively coupled, the electrical quantity is the coil current or mutual inductance. When the first resonant unit and the second resonant unit are capacitively coupled, the electrical quantity is the plate voltage or capacitive reactance.

4. The adaptive WPT system based on symmetric anti-resonance as described in claim 2, characterized in that, The controllable gain module includes an inverter circuit, a drive unit, and a control chip. The inverter circuit is connected between the power supply and the anti-resonance structure and is used to invert DC to AC. The drive unit is connected to the inverter circuit and controlled by the control chip. The control chip is used to acquire the electrical quantity and dynamically control the drive unit according to the change of the electrical quantity to adjust the AC voltage value output by the inverter circuit.

5. The adaptive WPT system based on symmetric anti-resonance as described in claim 4, characterized in that, The inverter circuit can be any one of a full-bridge inverter circuit, a half-bridge inverter circuit, a full-bridge LLC circuit, a half-bridge LLC circuit, and a phase-shifted full-bridge circuit.

6. The adaptive WPT system based on symmetric anti-resonance as described in claim 1, characterized in that, The resonant structure also includes a compensation element connected to the third resonant unit to form a compensation network circuit.

7. An adaptive WPT method based on symmetric anti-resonance-resonance, characterized in that, Including the following steps: S1. Provide an adaptive WPT system based on symmetric anti-resonance-resonance as described in any one of claims 1 to 6; S2. During wireless power transmission using the system, the input voltage value is adjusted using a controllable gain module, and the system is kept in a constant state. .

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