Bilateral impedance trajectory optimization high-frequency wireless power transmission system and method based on multi-mode matching network integration and near-zero impedance angle rectifier

Abstract

The invention discloses a double-side impedance trajectory optimization high-frequency wireless electric energy transmission system and method based on multi-mode matching network integration and a near-zero impedance angle rectifier, and relates to the field of high-frequency wireless electric energy transmission. The problems that the impedance conversion function of an existing high-frequency resonant rectifier structure shows nonlinear capacitive change, a large number of reactive components are generated, the impedance angle fluctuates greatly along with the load, the voltage stress is high, the efficiency is sharply reduced in the wide load range and the like are solved. One end of a multi-mode matching network is connected with a Class-E power amplifier and the other end of the multi-mode matching network is connected with a coupling coil through impedance track optimization at a primary side, so that output power change compression under wide-range load change is realized; the secondary side is connected with the coupling coil through a near-zero impedance angle rectifier, the near-zero impedance angle rectifier comprises a three-unit novel resonant rectifier, the three-unit novel resonant rectifier comprises three-mode smooth input impedance, the three-mode smooth impedance is connected in parallel, and impedance angle compression and high-efficiency operation under a wide load are achieved.

Description

Technical Field

[0001] This invention relates to the field of high-frequency wireless power transmission technology, specifically to a high-frequency wireless power transmission system and method based on dual-sided impedance trajectory optimization using multi-mode matching network integration and near-zero impedance angle rectifier. Background Technology

[0002] Impedance matching technology is crucial in high-frequency wireless power transfer (WPT) systems. Currently, there is extensive research on static and dynamic impedance matching, including static impedance matching network transformation models, impedance window compression and shifting designs, secondary-side inductor / capacitor conjugate matching networks, dynamic active reactance redirection, and variable parameter devices. However, static matching lacks sufficient wide-range impedance transformation capability, while dynamic matching has low power density. Although linear cascading of these two technologies can enhance impedance regulation, it fails to fully leverage their respective advantages and still cannot meet the demands for high power density and wide-range regulation. Furthermore, most current research does not optimize the impedance trajectory at various points in the high-frequency wireless system. Facing wide-range load variations, mathematical optimization models for the impedance trajectories of the secondary side, reflector stage, and power amplifier output are urgently needed to achieve functional output (constant power) and improve system efficiency.

[0003] In terms of topology, there has been extensive research on Class E resonant topologies and bridge power converter performance optimization, including the introduction of auxiliary zero-voltage switching (ZVS) circuits, integrated multiplexing design of rectification and voltage regulation functions, and synchronous rectification control. Currently, most research focuses on power amplifier topologies, and there is an urgent need for high-frequency rectifier structure design theories with wide range, low voltage stress, zero impedance angle, no energy circulating current, and adjustable impedance, in order to improve the high-efficiency conversion capability at the energy pickup end.

[0004] In summary, the following key scientific issues currently exist in high-frequency wireless power transfer systems: 1. The impedance conversion function of high-frequency resonant rectifiers exhibits nonlinear capacitive variation, generating a large amount of reactive power. This leads to problems such as significant impedance angle fluctuations with load, high voltage stress, and a sharp decline in efficiency over a wide load range, thus hindering system performance improvement. Furthermore, a unified efficiency optimization model for the secondary side is lacking in the face of wide-range load variations.

[0005] 2. High-frequency power amplifiers have a relatively narrow high-efficiency impedance range, which limits the system's adjustment capability for a wide range of applications and lacks a unified impedance trajectory design method.

[0006] 3. The high voltage stress of the topology, the limited high-efficiency impedance operating range, and the high-frequency parasitic effects affect the output power capability of a single-stage high-frequency wireless power transfer system.

[0007] Therefore, this invention explores a wide-range, high-density, multi-segment impedance network integrated multiplexing design and impedance trajectory customization method, and conducts research on high-frequency high-performance rectifiers. It has certain scientific significance and application value, and will provide a theoretical basis for enhancing the power regulation capability, improving the robustness, and optimizing the operating efficiency of high-frequency wireless power transmission systems. Summary of the Invention

[0008] This invention addresses the challenges of nonlinear capacitive impedance transformation in existing high-frequency resonant rectifiers, which generates significant reactive power components, leads to large impedance angle fluctuations with load, high voltage stress, and a sharp decline in efficiency over a wide load range, thus hindering system performance improvement. Furthermore, it clarifies the lack of a unified efficiency optimization model for the secondary side in the face of wide load variations; the relatively narrow high-efficiency impedance range of high-frequency power amplifiers limits system adjustment capabilities for wide-range applications, and the lack of a unified impedance trajectory design method. Additionally, it addresses issues such as high voltage stress in the topology, limited high-efficiency impedance operating range, and the impact of high-frequency parasitic effects on the output power capability of single-stage high-frequency wireless power transfer systems. Therefore, this invention proposes a dual-sided impedance trajectory optimization high-frequency wireless power transfer system and method based on multi-mode matching network integration and a near-zero impedance angle rectifier.

[0009] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: Option 1: This invention proposes a high-frequency wireless power transfer system based on dual-sided impedance trajectory optimization using a multi-mode matching network integration and a near-zero impedance angle rectifier. The system includes a Class-E power amplifier, a multi-mode matching network, a coupling coil, and a near-zero impedance angle rectifier. On the primary side, impedance trajectory optimization is achieved by connecting one end of a multimode matching network to a Class-E power amplifier and the other end to a coupling coil to compress output power variations under a wide range of load changes. The secondary side is connected to the coupling coil through a near-zero impedance angle rectifier. The near-zero impedance angle rectifier includes a three-unit novel resonant rectifier, which includes a three-mode smooth input impedance. The three-mode smooth impedances are connected in parallel to achieve impedance angle compression and high-efficiency operation under wide loads.

[0010] Furthermore, in a preferred embodiment, the Class-E power amplifier includes an input power supply voltage. V dc Choke inductor L f Switching transistor Q 1. CapacitorC S Filter resonant capacitor C 0. Filter resonant inductor L 0; The input power supply voltage V dc One end is connected to the choke inductor L f One end is connected to the other end, and the other end is connected to the switching transistor. Q 1 phase connection, the switching transistor Q 1 parallel capacitor C S Parallel capacitors C S Series filter resonant capacitor C 0. Series filter resonant inductor L 0, the filter resonant inductor L The other end of 0 is connected to a multimodal matching network.

[0011] Furthermore, a preferred embodiment is provided, wherein the multimodal matching network includes a dynamic matching network DIMN. The dynamic matching network DIMN includes dynamic matching network a, dynamic matching network b, and dynamic matching network c. Dynamic matching network a includes three resonant elements XTa1 to XTa3, dynamic matching network b includes three resonant elements XTb1 to XTb3, and dynamic matching network c includes three resonant elements XTc1 to XTc3. The nine resonant elements are simplified into a four-element switching network.

[0012] Furthermore, a preferred embodiment is provided, wherein the method for achieving impedance angle compression and high-efficiency operation of the near-zero impedance angle rectifier under wide load is as follows: the real part of the input impedance Rrec of the rectifier unit is placed in the high-efficiency impedance range of the coil to reduce the impedance angle variation range; a real impedance adaptation transformation is performed on the input side to determine an energy-free circulating current clamping structure to achieve high-efficiency operation of the coil and rectifier.

[0013] Option 2: A high-frequency wireless power transfer method based on dual-sided impedance trajectory optimization of multi-mode matching network integration and near-zero impedance angle rectifier. This method is implemented based on the system described in Option 1 and includes the following steps: Step 1: Design the parameters of the near-zero impedance angle rectifier, obtain the trajectory curve of the rectifier input impedance Zrec as a function of load, and place the impedance trajectory of the input impedance Zrec into the high efficiency range of the coil, thus completing the secondary side impedance trajectory optimization. Step 2: Based on the input impedance Zrec described in Step 1, the impedance trajectory is reflected by the coupling coil to obtain the coil reflection impedance Zcoil. The impedance trajectory of the reflection impedance Zcoil is then processed by the multimode matching network DIMN to obtain the power amplifier output impedance Zpa. The output impedance Zpa trajectory is placed in the high-efficiency range of the power amplifier and extended along the constant power output range, thus completing the first-order side impedance trajectory optimization. Step 3: Perform parameter integration and device reuse on dynamic matching network a, dynamic matching network b, and dynamic matching network c in the multimodal matching network. At the same time, perform parameter integration on inductors L0 and L1 to obtain LI1, C4 and CtX to obtain CIP, and Crx and LSX to obtain CIS. Step 4: Through the integrated matching network of three rectifier units, the coil reflection impedance is reduced. Z coil Convert to output impedance Z pa This enables high-efficiency operation of the power amplifier and compression of output power variations.

[0014] Furthermore, a preferred embodiment is provided, wherein the method for calculating the input impedance Zrec in step 1 is as follows: Input impedance Z rec_RU The calculation method is as follows: (1) (2) (3) That is, the calculation method for the input impedance of a near-zero impedance angle rectifier is as follows: (4) in, d It is the diode's duty cycle. It is the initial phase angle of the rectifier input current. N Represents the number of parallel rectifier modules. C i and C ii For capacitors, L T , C T and C r The parameter is the resonance.

[0015] Furthermore, a preferred embodiment is provided, in which the method further includes a step of comparing the diode voltage stress of the three rectifier units with that of a full-wave rectifier under the same load and power conditions.

[0016] Furthermore, a preferred embodiment is provided, in which the method for comparing the diode voltage stress of three rectifier units and a full-wave rectifier under the same load and power conditions is as follows:

[0017] Among them, V D_FW The peak voltage stress of the diode in the full-wave rectifier is V. D_N3 The peak voltage stress of the three rectifier units.

[0018] Option 3: A computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the method described in Option 2.

[0019] Option 4: A computer device, including a memory and a processor, wherein the memory stores a computer program, and when the processor runs the computer program stored in the memory, the processor executes the method described in Option 2.

[0020] The advantages of this invention are: The core objective of this invention, a high-frequency wireless power transfer system and method based on multi-mode matching network integration and a near-zero impedance angle rectifier with optimized dual-side impedance trajectory, is to simultaneously optimize the performance of both the primary and secondary sides of the high-frequency wireless power transfer system. It proposes a principle for enhancing the system's wide-range adjustment capability and an efficiency improvement scheme, providing technical support and theoretical basis for the practical application of high-frequency WPT systems. On the primary side, a multi-mode matching network (i.e., a multi-segment impedance trajectory) is used to fully utilize the high-efficiency impedance range of the power amplifier, thereby compressing output power variations under a wide range of load changes. On the secondary side, a novel near-zero impedance angle resonant rectifier is proposed. By introducing a resonant network to optimize the phase relationship, the reactive component on the secondary side is reduced, and the efficiency of the coupling coil is improved. A multi-unit series-parallel architecture is adopted to disperse voltage stress, achieving impedance angle compression and high-efficiency operation under wide loads.

[0021] The tri-mode integrated impedance matching network (IMN) proposed in this invention reduces power supply size, ensures smooth tri-mode impedance connection, achieves efficiency improvement and power variation range compression under a wide range of load changes, and fully integrates the complementary advantages of dynamic and static impedance matching.

[0022] The novel three-unit resonant rectifier topology proposed in this invention ensures a near-zero input impedance angle design for the rectifier under a wide range of load variations, significantly reduces diode voltage stress in the rectifier, ensures a non-circulating current design, increases the range of device selection, and broadens the application scenarios of high-frequency WPT systems.

[0023] The mathematical model for synchronous optimization of the primary / secondary impedance trajectories of the high-frequency WPT system proposed in this invention achieves synergistic optimization of efficiency, volume, stress, and wide-range adjustment capability.

[0024] Based on the traditional high-frequency wireless power transfer (WPT) system architecture, this invention proposes a novel near-zero impedance angle rectifier and a multi-mode matching network from the perspective of optimizing the impedance trajectory on both sides, achieving simultaneous optimization of system efficiency, stress, and functional output. This invention is simple to implement, has stable and reliable performance, and has broad application prospects in the field of high-frequency wireless power transfer. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the high-performance resonant rectifier construction method described in Embodiment 1.

[0026] Figure 2 This is a schematic diagram illustrating the rectifier input impedance angle compression and coil efficiency improvement described in Embodiment 1.

[0027] Figure 3 This is a schematic diagram of the output performance of the Class-E power amplifier based on the reflection impedance Zpa as described in Implementation Method 1.

[0028] Figure 4 This is a schematic diagram of the high-efficiency impedance range of the Class-E power amplifier described in Implementation Method 1.

[0029] Figure 5 This is a schematic diagram of the output power variation compression range of the Class-E power amplifier described in Implementation Method 1.

[0030] Figure 6 This is a schematic diagram of the architecture of the novel high-frequency wireless power transmission system described in Implementation Method 1.

[0031] Figure 7 This is a schematic diagram of the architecture of the novel near-zero impedance angle rectifier described in Embodiment 1.

[0032] Among them, (a) is a schematic diagram of the topology, (b) is a schematic diagram of the rectifier input impedance trajectory and coil efficiency model, and (c) is a schematic diagram of the rectifier input impedance value, impedance angle and coil efficiency variation.

[0033] Figure 8 This is a schematic diagram illustrating the stress optimization effect of the novel near-zero impedance angle rectifier described in Implementation Method 1.

[0034] Figure 9 This is a schematic diagram of the novel WPT system combining a multimodal matching network and a near-zero impedance angle rectifier as described in Implementation Method 1.

[0035] Figure 10This is a schematic diagram of the system impedance trajectory change process described in Implementation Method 1.

[0036] Figure 11 This is a schematic diagram of the power amplifier, the three-unit novel rectifier, and the coil current changes under the 80Ω condition described in Embodiment 1.

[0037] Figure 12 This is a schematic diagram of the power amplifier, the three-unit novel rectifier, and the coil current changes under the 140Ω condition described in Embodiment 1.

[0038] Figure 13 This is a schematic diagram of the power amplifier, the three-unit novel rectifier, and the coil current changes under the 180Ω condition described in Embodiment 1.

[0039] Figure 14 This is a schematic diagram of the mode switching process described in Implementation Method 1.

[0040] Figure 15 This is a schematic diagram illustrating the changes in output power, efficiency, and voltage with load as described in Implementation Method 1. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them.

[0042] Implementation Method 1: This implementation method proposes a high-frequency wireless power transfer system and method based on dual-sided impedance trajectory optimization using multi-mode matching network integration and near-zero impedance angle rectifiers, specifically including the following steps: This implementation method achieves optimal efficiency tracking on the secondary side by compressing the nonlinear capacitive impedance variation of the high-frequency rectifier and employing a static impedance trajectory parameterization design method. It analyzes the mathematical relationship between the rectifier unit input impedance and the load, duty cycle, and resonant parameters. Based on the harmonic injection principle of the second-order impedance network, it proposes a wide-range, low-pressure-stress, highly symmetrical, zero-impedance-angle rectifier topology construction method. A unified mathematical model of rectifier input impedance and coil efficiency is established, exploring a reasonable matching mechanism between the rectifier input impedance and the high-efficiency impedance range of the coil, compressing reactive power components, and improving system efficiency.

[0043] For the construction method of the new rectifier, please refer to Figure 1 As shown, by introducing a resonant network, the inherent characteristic impedance of the basic rectifier unit is transformed, the phase relationship of the input voltage and current in the rectifier stage is optimized, and an adaptive integrated rectifier structure model is established by combining the optimal combination of multiple unit modules with configurable connections. Simultaneously, the real component of the rectifier's input impedance is... Rrec Place it in the high-efficiency impedance range of the coil and narrow the range of impedance angle variation, such as Figure 2 As shown, resistance values ​​are divided for the output-side load to adjust the load range of a single rectifier unit, further achieving wide-range impedance angle compression and low-voltage stress operation of the rectifier. For the input side, real impedance adaptation is performed to find an energy-free circulating current clamping structure, thereby improving the efficiency of the coil and rectifier.

[0044] This paper analyzes the simplified impedance trajectory design theory for multimodal systems, revealing the principle behind enhanced power regulation capability of single-stage systems. Through the design of a high-power-density matching network with wide-range impedance regulation, the advantages of dynamic and static impedance matching are fully integrated to achieve multi-mode, robust, and high-performance output. By analyzing and comparing the utilization rate of impedance networks in limited impedance space, methods for reducing power amplifier losses and maintaining functionality under wide load variations are studied. Integrated parameter design and device reuse criteria for multimodal matching networks are proposed, a mathematical model for multi-segment simplified impedance trajectory setting is established, and a stability-adaptive mode-switching control strategy based on state detection is explored.

[0045] Figure 3 Give the output performance of the Class-E circuit, in terms of the power amplifier output impedance. Z pa The analysis is based on this. The red area represents the high-efficiency impedance range of the Class-E circuit, and the soft-switching effect becomes increasingly ideal as one moves closer to the center, exhibiting neither severe hard switching nor excessive reverse conduction. Regarding output power, as... Z pa As the impedance shifts to the upper right, the output energy of the Class-E circuit gradually decreases. Observe the diagram. ŋ pai and P pai This will allow for a clearer understanding of the circuit's characteristics (i=1,2,3,4). ŋ pai Corresponding to different circuit efficiency contour lines P pai These correspond to different output power contour lines. To ensure high system efficiency, it is necessary to... Z pa Try to get as close as possible to the red target area. At this point, an impedance matching network is needed to transform it, such as... Figure 4 As shown. Furthermore, another function of the impedance matching network is to ensure the functional output of the system; in this invention, this means the ability to compress variations in the output power of the load branch, such as... Figure 5 As shown.

[0046] Based on multimodal matching networks and near-zero impedance angle rectifier design, a novel high-frequency wireless power transfer system architecture is proposed (e.g., Figure 6As shown in the figure, the impedance trajectories of the primary and secondary sides are optimized simultaneously. A multi-mode simplified impedance trajectory design theory is adopted to enhance the system's power regulation capability, significantly compress the system's power output fluctuation range under wide load variations, and reduce the size of passive components by utilizing parameter integration and device reuse methods. Combined with a three-unit rectifier design, the high voltage stress generated under wide load variations is significantly reduced, reactive power components are decreased, and coil efficiency is improved.

[0047] Figure 7 (a) A novel near-zero impedance angle rectifier topology is presented, where RU-1 to RU-N are identical independent rectifier modules connected in a "parallel input, series output" configuration. The proposed near-zero impedance angle rectifiers are configured and combined according to power level, voltage pressure, and load variation requirements to meet practical needs. (Input impedance of independent rectifier modules) Z rec_RU as follows: (1) (2) (3) in, d It is the diode's duty cycle. This is the initial phase angle of the rectifier input current (starting from the diode turn-off moment). The input impedance of the near-zero impedance angle rectifier is as follows: (4) N Represents the number of parallel rectifier modules, capacitors C i and C ii Its main function is to isolate the DC component and decouple the DC output of multiple rectifier units from the AC input, thereby ensuring the independence of each energy channel. L T (1.1962μH) C T (1201pF) and C r A 500pF diode participates in resonance, compressing the nonlinear effect of the diode capacitor and reducing impedance angle variation. Combined with power combining concepts and configurable design, this provides the possibility of building a high-power MHz WPT system. Series connection of multiple rectifier modules at the output facilitates compression of a wide range of load variations, while parallel connection of the inputs allows adjustment of the secondary impedance to suit the high-efficiency range of the coil. Notably, each basic rectifier unit retains a choke inductor to reduce high-frequency interference to subsequent loads.

[0048] from Figure 7(b) It can be seen that the rectifier input impedance trajectory described in this invention is located in the high-efficiency range of the coil efficiency model. L tx , L rx With a mutual inductance of 1.25 μH and a mutual inductance of 6.35 μH, the efficiency of the secondary side was improved. Figure 7 (c) provides specific values ​​for the rectifier impedance change, the corresponding impedance angle change, and the coil efficiency. It can be seen that the maximum impedance angle is below 15°, and the coil efficiency is above 97%, which is in line with expectations. Figure 8 The paper presents a comparison of diode voltage stress between the proposed three-unit rectifier and a traditional full-wave rectifier under the same load and power conditions, showing a stress reduction of approximately 55%. The voltage stress reduction ratio is defined as follows: (4) The peak voltage stress of a traditional full-wave rectifier diode is V D_FW The peak voltage stress of the proposed three-unit rectifier is V D_N3 . Figure 9 A novel WPT system combining a multimode matching network and a near-zero impedance angle rectifier is presented. Through parameter integration and device reuse, while retaining the design freedom of the three-segment impedance trajectory (i.e., wide-range functional maintenance-output power variation compression), the three-unit matching network (9 passive resonant devices) is simplified into a 4-element switching network. Table 1 shows the multimode device reuse under different load variations.

[0049] Table 1. Multimodal device reuse status

[0050] Figure 10 The impedance trajectory variation process of the entire new WPT system is given: the input impedance of the three-unit rectifier under a load variation of 80-200Ω. Z rec Extending along the horizontal axis of the zero imaginary part (the trajectory of the green triangle), the reflected impedance is obtained through the action of the coupling coil. Z coil (Red square trajectory), at this time Z coil Outside the high-efficiency range of the power amplifier, through the action of a three-unit integrated matching network, Z coil Switch to Z pa (Blue circular trajectory), thereby achieving high-efficiency operation of the power amplifier and compression of output power variation.

[0051] Table 2 provides the system integration parameters. Figures 11 to 13The current characteristics of the power amplifier, the new three-unit rectifier, and the coil are presented for 80Ω, 140Ω, and 180Ω circuits, respectively. It can be seen that the power amplifier maintains soft-switching characteristics, the new rectifier achieves stress reduction and eliminates circulating current, and the primary and secondary currents are nearly 90° misaligned, thus reducing the reactive component on the secondary side. Figure 14 The three-stage mode switching process is presented. No surge overshoot problem occurred in the system, thanks to the similar energy states at the impedance trajectory switching points. Figure 15 The system power and efficiency are given as a function of load fluctuations, and the expected power variation compression effect is achieved.

[0052] Table 2 Multimodal System Integration Parameter Values

[0053] In summary, based on the traditional high-frequency WPT system architecture, this invention proposes a near-zero impedance angle rectifier and a multi-mode matching network from the perspective of dual-sided impedance trajectory optimization, achieving simultaneous optimization in terms of system efficiency, stress, and functional output. This invention is simple to implement, has stable and reliable performance, and has broad application prospects in the field of high-frequency wireless power transmission.

[0054] Those skilled in the art will understand that the above description is merely a preferred embodiment of the present invention, and the features described in the various embodiments and / or claims of this disclosure can be combined or combined in various ways, even if such combinations or combinations are not explicitly described in this disclosure. This is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0055] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention. Clearly, those skilled in the art can make various alterations and modifications to the invention without departing from its spirit and scope. Thus, if these modifications and modifications of the invention fall within the scope of the claims and their equivalents, the invention is also intended to include these modifications and modifications.

Claims

1. A high-frequency wireless power transfer system based on dual-sided impedance trajectory optimization using multi-mode matching network integration and near-zero impedance angle rectifier, characterized in that, The system includes a Class-E power amplifier, a multimode matching network, a coupling coil, and a near-zero impedance angle rectifier; On the primary side, impedance trajectory optimization is achieved by connecting one end of a multimode matching network to a Class-E power amplifier and the other end to a coupling coil to compress output power variations under a wide range of load changes. The secondary side is connected to the coupling coil through a near-zero impedance angle rectifier. The near-zero impedance angle rectifier includes a three-unit novel resonant rectifier, which includes a three-mode smooth input impedance. The three-mode smooth impedances are connected in parallel to achieve impedance angle compression and high-efficiency operation under wide loads.

2. The high-frequency wireless power transfer system based on multi-mode matching network integration and near-zero impedance angle rectifier with optimized dual-sided impedance trajectory as described in claim 1, characterized in that, The Class-E power amplifier includes an input power supply voltage. V dc Choke inductor L f Switching transistor Q 1. Capacitor C S Filter resonant capacitor C 0. Filter resonant inductor L 0; The input power supply voltage V dc One end is connected to the choke inductor L f One end is connected to the other end, and the other end is connected to the switching transistor. Q 1 phase connection, the switching transistor Q 1 parallel capacitor C S Parallel capacitors C S Series filter resonant capacitor C 0. Series filter resonant inductor L 0, the filter resonant inductor L The other end of 0 is connected to a multimodal matching network.

3. The high-frequency wireless power transfer system based on multi-mode matching network integration and near-zero impedance angle rectifier with optimized dual-sided impedance trajectory as described in claim 1, characterized in that, The multimodal matching network includes a dynamic matching network DIMN. The dynamic matching network DIMN includes dynamic matching network a, dynamic matching network b, and dynamic matching network c. Dynamic matching network a includes three resonant elements XTa1 to XTa3, dynamic matching network b includes three resonant elements XTb1 to XTb3, and dynamic matching network c includes three resonant elements XTc1 to XTc3. The nine resonant elements are simplified into a four-element switching network.

4. The high-frequency wireless power transfer system based on multi-mode matching network integration and near-zero impedance angle rectifier with optimized dual-sided impedance trajectory as described in claim 1, characterized in that, The method for achieving impedance angle compression and high-efficiency operation under wide load in the near-zero impedance angle rectifier is as follows: the real part of the input impedance Rrec of the rectifier unit is placed in the high-efficiency impedance range of the coil to reduce the impedance angle variation range; the real part impedance adaptation transformation is performed on the input side to determine the energy-free circulating current clamping structure to achieve high-efficiency operation of the coil and rectifier.

5. A high-frequency wireless power transfer method based on dual-sided impedance trajectory optimization of multi-mode matching network integration and near-zero impedance angle rectifier, characterized in that... The method is implemented based on the system described in claim 1, and the method includes the following steps: Step 1: Design the parameters of the near-zero impedance angle rectifier, obtain the trajectory curve of the rectifier input impedance Zrec as a function of load, and place the impedance trajectory of the input impedance Zrec into the high efficiency range of the coil, thus completing the secondary side impedance trajectory optimization. Step 2: Based on the input impedance Zrec described in Step 1, the impedance trajectory is reflected by the coupling coil to obtain the coil reflection impedance Zcoil. The impedance trajectory of the reflection impedance Zcoil is then processed by the multimode matching network DIMN to obtain the power amplifier output impedance Zpa. The output impedance Zpa trajectory is placed in the high-efficiency range of the power amplifier and extended along the constant power output range, thus completing the first-order side impedance trajectory optimization. Step 3: Perform parameter integration and device reuse on dynamic matching network a, dynamic matching network b, and dynamic matching network c in the multimodal matching network. At the same time, perform parameter integration on inductors L0 and L1 to obtain LI1, C4 and CtX to obtain CIP, and Crx and LSX to obtain CIS. Step 4: Through the integrated matching network of three rectifier units, the coil reflection impedance is reduced. Z coil Convert to output impedance Z pa This enables high-efficiency operation of the power amplifier and compression of output power variations.

6. The high-frequency wireless power transfer method based on dual-sided impedance trajectory optimization of multi-mode matching network integration and near-zero impedance angle rectifier according to claim 5, characterized in that, The method for calculating the input impedance Zrec in step 1 is as follows: Input impedance Z rec_RU The calculation method is as follows: (1) (2) (3) That is, the calculation method for the input impedance of a near-zero impedance angle rectifier is as follows: (4) in, d It is the diode's duty cycle. It is the initial phase angle of the rectifier input current. N Represents the number of parallel rectifier modules. C i and C ii For capacitors, L T , C T and C r The parameter is the resonance.

7. The high-frequency wireless power transfer method based on dual-sided impedance trajectory optimization of multi-mode matching network integration and near-zero impedance angle rectifier according to claim 5, characterized in that, The method also includes a step of comparing the diode voltage stress of the three rectifier units with that of a full-wave rectifier under the same load and power conditions.

8. The high-frequency wireless power transfer method based on dual-sided impedance trajectory optimization of multi-mode matching network integration and near-zero impedance angle rectifier according to claim 7, characterized in that, The method for comparing the diode voltage stress of the three rectifier units and the full-wave rectifier under the same load and power conditions is as follows: in, This represents the peak voltage stress of the full-wave rectifier diode. The peak voltage stress of the three rectifier units.

9. A computer storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the method of claim 5.

10. A computer device, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the method of claim 5.

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