A Wide Dynamic Load Wireless Energy Transmission System and Method Based on Dual-Tone Signals

Abstract

The present invention discloses a wide dynamic load wireless energy transmission system and method based on a dual-tone signal. The wide dynamic load wireless energy transmission system dynamically adjusts the circuit structure through a feedback loop to achieve impedance matching; the feedback loop includes a voltage divider structure and a switching component; the switching component includes a junction field effect transistor, an operational amplifier, and a reference resistor; different connection structures are arranged at different positions on the primary coil; the drain of the junction field effect transistor is connected to the corresponding connection structure; the source of the junction field effect transistor is grounded; the gate of the junction field effect transistor is connected to the output of the operational amplifier; the negative input of the operational amplifier is connected to the voltage divider structure; and the positive input of the operational amplifier is connected between the reference resistor and the reference voltage. The present invention can not only maintain efficient power transmission under dynamic load conditions, but also significantly simplify the control structure, reducing system complexity and cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of wireless power transmission, and in particular relates to a wide dynamic load wireless energy transmission system and method based on dual-tone signals. Background Art

[0002] Wireless power transfer (WPT) technology plays a vital role in modern electronic devices. It transfers energy between a transmitter and receiver via radio frequency or microwave signals, enabling efficient wireless transmission of electrical energy. This technology is widely used in scenarios ranging from low-power radio frequency identification (RFID) to higher-power IoT and medical devices. Particularly in low-power applications (e.g., in the 1-200mW range), the effectiveness of WPT technology plays a crucial role in system performance. Low-power WPT systems must ensure efficient and stable power transmission within a limited energy budget. In these low-power applications, WPT systems typically require efficient rectification and impedance matching to minimize transmission losses and improve the overall energy efficiency of the system.

[0003] To improve power transmission efficiency in wireless power transfer (WPT) systems, dynamic impedance matching technology based on novel topologies has emerged. A common implementation approach is to further develop new structures such as the isolated SEPIC converter (single-ended primary inductor converter) and Zeta converter based on the traditional Buck and Boost topologies of DC-DC converters.

[0004] like Figure 1 As shown in the figure, the design based on the Zeta converter adaptively adjusts the matching of input and load impedance by adjusting the parameters of the converter to ensure a stable improvement in power conversion efficiency (PCE). Impedance matching is achieved by the inductors L1 and L2 and the coupling capacitor C1. The Zeta converter operates in discontinuous conduction mode (DCM). When the switch is turned on, the inductors L1 and L2 store energy synchronously; when the switch is turned off, the energy in the inductor is released to the load end to maintain stable power output of the system. By controlling the duty cycle of the switch, the Zeta converter can effectively adjust the input impedance R in , so that it can adapt to different load requirements, thereby ensuring that the system can still achieve efficient energy transmission and impedance matching when the load changes frequently.

[0005] like Figure 2As shown in Figure 1, the isolated SEPIC converter utilizes maximum power point tracking (MPPT) technology to dynamically adjust the duty cycle to achieve efficient impedance matching over a wide load range. In the isolated SEPIC converter, impedance matching is achieved through the coordinated operation of inductor L1, inductor L2, and coupling capacitor C1. Specifically, when switch S1 turns on, inductor L1 begins to store energy, and capacitor C1 transfers some of the charge to inductor L2 to maintain current supply to the load. As S1 switches on and off, the inductor and capacitor alternately transfer energy in different modes to maintain a stable voltage at the load. By adjusting the switch duty cycle, the input impedance of the SEPIC converter can dynamically adapt to different loads, achieving efficient impedance matching.

[0006] These topologies achieve dynamic impedance matching by adjusting the duty cycle in real time, significantly improving power conversion efficiency (PCE) and maintaining efficient energy transfer even with large load variations. This reduces reliance on traditional independent matching networks and reduces system complexity. However, these designs require high control precision, especially when the load changes rapidly. The dynamic response speed is limited, and to achieve efficient dynamic feedback, these topologies often require more components. In addition, DCDC converters have inherent switching losses at high frequencies, which can significantly reduce power conversion efficiency (PCE) under low-power conditions (1-200mW), hindering overall system performance.

[0007] Another common implementation method is to achieve impedance matching by adjusting the transformer's turns ratio. This type of design, such as forward and flyback converters, can achieve high energy transfer efficiency across a wide voltage range and offer the advantage of electrical isolation, making it suitable for a variety of WPT scenarios. Impedance matching is achieved through the synergistic effect of transformers TR1 and TR2. First, TR1 adjusts the turns ratio between the primary and secondary sides to convert the collected low-voltage signal to a voltage range suitable for the startup circuit, thereby achieving initial impedance matching. After startup, TR2 continues to fine-tune the system's input impedance, dynamically adapting to varying load conditions through its transformer characteristics to ensure that the load impedance matches the input impedance, optimizing energy transfer efficiency. TR1 and TR2 work together to ensure effective impedance matching under varying voltage and load conditions.

[0008] However, these approaches have several drawbacks. First, transformer impedance adjustment typically relies on a preset turns ratio or limited switching options, resulting in a slow response to frequent load changes and difficulty achieving precise real-time adjustment. Furthermore, achieving precise impedance matching often requires the design of complex circuit switching structures, increasing system complexity and cost. Furthermore, these approaches have poor adaptability outside of specific frequency and load ranges, making them less effective than other dynamic adjustment techniques in scenarios with frequent load and power fluctuations. Summary of the Invention

[0009] The object of the present invention is to provide a wide dynamic load wireless energy transmission system and method based on dual-tone signals.

[0010] In the first aspect, the present invention provides a wide dynamic load wireless energy transmission system based on a dual-tone signal, which includes a transmitting end and a receiving end; the receiving end includes a feedback loop and a receiving antenna, a coupling capacitor C1, a front-end rectifier and voltage regulator module, a transformer, a terminal rectifier and voltage regulator module and a load Z connected in sequence. L .

[0011] The feedback loop includes a voltage divider structure and a switching component; the voltage divider structure is connected in parallel to the load Z L The switching assembly includes a soft switching element and a reference resistor. The primary coil of the transformer is provided with a connection structure between the input terminal and the ground terminal. The soft switching element is connected between the connection structure of the primary coil of the transformer and the ground terminal. The control interface of the soft switching element is connected to the voltage divider position on the voltage divider structure and is connected to the ground line through the reference resistor.

[0012] Preferably, the feedback loop includes multiple switching components; the number of connection structures on the primary coil is equal to and corresponds one to one to the number of switching components; different connection structures are arranged at different positions of the primary coil; the switching component also includes an operational amplifier; the negative input terminal of the operational amplifier is connected to the voltage divider structure; and the operational amplifier is arranged between the voltage divider structure and the soft switching element.

[0013] Preferably, the output terminal of the operational amplifier is connected to the gate of the soft switching element; the positive input terminal of the operational amplifier is connected between the reference resistor and the reference voltage; and the negative input terminal of the operational amplifier is connected to the voltage divider structure.

[0014] Preferably, the order of arrangement of the reference resistors of each switching component along the reference voltage to the ground line is consistent with the order of the connection structures corresponding to each switching component along the ground end to the input end of the primary coil.

[0015] Preferably, the soft switching element is a junction field effect transistor.

[0016] Preferably, the front-end rectifier and voltage stabilization module includes a front-end rectifier and a front-end filter; the front-end rectifier includes a diode D1, an inductor L1 and a capacitor C2; one end of the coupling capacitor C1 is connected to the receiving antenna, and the other end is connected to the diode D1 and one end of the capacitor C2; the other ends of the diode D1 and the capacitor C2 are connected to one end of the inductor L1, and the other end of the inductor L1 is grounded; the front-end filter includes an inductor L2 and a capacitor C3; one end of the inductor L2 is connected to the output of the front-end rectifier, and the other end is grounded through the capacitor C3;

[0017] The terminal rectifier and voltage stabilization module includes a diode D2, an inductor L3, a capacitor C4 and a capacitor C5; the positive electrode of the diode D2 is connected to the input end of the terminal rectifier and voltage stabilization module, and the negative electrode of the diode D2 is grounded through two parallel branches; the first branch is provided with a capacitor C4; the second branch is provided with an inductor L3 and a capacitor C5 connected in series.

[0018] Preferably, the operating frequency of the wireless power transmission system is 1mW~200mW.

[0019] In the second aspect, the present invention provides a wide dynamic load wireless energy transmission method based on a dual-tone signal, which uses the above-mentioned wide dynamic load wireless energy transmission system. The wide dynamic load wireless energy transmission method includes the following steps: the transmitting end transmits a dual-tone signal with a DC component; the receiving antenna receives the dual-tone signal and processes the dual-tone signal in sequence through a coupling capacitor C1, a front-end rectifier, a front-end filter, a transformer, and a terminal rectifier and voltage stabilization module, and then inputs the dual-tone signal to the load Z L ;

[0020] The resistors R1 and R2 in the feedback loop divide the output voltage of the terminal rectifier and voltage regulator module to obtain the feedback voltage V fb , and input into the negative input terminal of the operational amplifier; the reference resistor generates a reference voltage V ref , and input into the positive input terminal of the operational amplifier; by comparing the reference voltage V ref and feedback voltage V fb The size of controls the on and off of the soft switching element and adjusts the turns ratio of the secondary coil to the primary coil.

[0021] As an advantage, the coupling capacitor C1 filters out the DC component in the dual-tone signal; the front-end rectifier generates the sum frequency component, the difference frequency component and the second harmonic, and the output signal ; The front-end filter is used to filter the signal Perform low-pass filtering to retain only the signal The DC component and difference frequency component in the output signal The transformer inputs the signal of the primary coil After coupling to the secondary coil, the output AC signal enters the terminal rectifier voltage regulator module; the terminal rectifier voltage regulator module converts the AC signal output by the transformer into a DC signal and then inputs it into the load Z L .

[0022] Preferably, the turns ratio of the secondary coil to the primary coil is adjusted in multiple stages; the number of stages of adjustment is equal to the number of soft switching elements plus one.

[0023] The present invention has the following beneficial effects:

[0024] 1. By dynamically modifying the circuit structure and simplifying the control strategy, this invention not only maintains efficient power transmission under dynamic load conditions, improving the system's adaptability and stability under dynamic load conditions, but also significantly simplifies the control structure, requiring only a basic resistive feedback loop to achieve dynamic feedback, reducing system complexity and cost. Furthermore, the present invention exhibits low power consumption, effectively optimizing energy transmission efficiency and reducing power loss in low-power applications (e.g., 1-200mW), thereby enhancing the stability of the wireless power transmission system and the adaptability of impedance matching.

[0025] 2. The present invention achieves impedance matching through a flexible circuit connection structure, can flexibly switch between different taps of the transformer, change the turns ratio, and significantly expand the load adaptation range in low-power scenarios through dynamic adjustment of the circuit structure, adapting to various power transmission scenarios and achieving a nearly full impedance matching effect.

[0026] 3. The present invention adopts JFET soft switching and utilizes fast on-and-off adjustment to significantly shorten the dynamic response time. It can complete impedance matching adjustment within milliseconds, ensuring that energy transmission in the range of 1 to 200 mW is always in the best matching state. At the same time, through real-time adjustment of dynamic impedance matching technology, the system can effectively reduce energy loss during transmission, thereby achieving an energy transfer efficiency of more than 90% in the low-power range. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The topology diagram of the Zeta converter; (a) is the schematic diagram; (b) is the actual diagram.

[0028] Figure 2 The Sepic converter structure diagram is shown in Figure 1. (a) is the schematic diagram and (b) is the actual diagram.

[0029] Figure 3 This is a system workflow diagram of Example 1 of the present invention.

[0030] Figure 4 This is a schematic diagram of the system structure of Example 1 of the present invention.

[0031] Figure 5 This is a time domain waveform diagram of a dual-tone signal according to embodiment 1 of the present invention.

[0032] Figure 6 This is a waveform change diagram of the dual-tone signal during the rectification and filtering process of Example 1 of the present invention.

[0033] Figure 7 This is a feedback diagram of Example 1 of the present invention.

[0034] Figure 8 This is a feedback diagram of Example 2 of the present invention. DETAILED DESCRIPTION

[0035] The present invention will be further described below with reference to the accompanying drawings.

[0036] Example 1

[0037] like Figure 3 and 4 As shown in the figure, a wide dynamic load wireless energy transmission system based on dual-tone signal focuses on efficient impedance matching optimization in low-power applications (such as 1mW~200mW), which includes a transmitter and a receiver; the transmitter includes a base station and a transmitting antenna connected in sequence; the receiving end includes a feedback loop and a receiving antenna, a coupling capacitor C1, a front-end rectifier and voltage regulator module, a transformer, a terminal rectifier and voltage regulator module and a load Z connected in sequence. L . Among them, the transformer and the feedback loop constitute a dynamic impedance matching network. The front-end rectification and voltage regulation module includes a front-end rectifier and a front-end filter; the front-end rectifier includes a diode D1, an inductor L1 and a capacitor C2; one end of the coupling capacitor C1 is connected to the receiving antenna, and the other end is connected to one end of the diode D1 and the capacitor C2 respectively; the other ends of the diode D1 and the capacitor C2 are connected to one end of the inductor L1, and the other end of the inductor L1 is grounded. The front-end filter includes an inductor L2 and a capacitor C3; one end of the inductor L2 is connected to the positive pole of the diode D1, and the other end is grounded through the capacitor C3. The transformer includes a primary coil and a secondary coil coupled to each other; one end of the primary coil is connected to the end of the capacitor C3 away from the ground, and the other end is grounded; one end of the secondary coil is connected to the input end of the terminal rectification and voltage regulation module, and the other end is grounded. The terminal rectifier and voltage stabilization module includes a diode D2, an inductor L3, a capacitor C4 and a capacitor C5; the positive electrode of the diode D2 is connected to the input end of the terminal rectifier and voltage stabilization module, and the negative electrode of the diode D2 is grounded through two parallel branches; the first branch is provided with a capacitor C4; the second branch is provided with an inductor L3 and a capacitor C5 connected in series.

[0038] The feedback loop includes a voltage divider structure and a switching component; the voltage divider structure is connected in parallel to the load Z L two ends; the voltage divider structure includes resistors R1 and R2 connected in series; the switching component includes a junction field effect transistor (JFET) and a reference resistor R3; one end of the reference resistor R3 is grounded, and the other end is connected to the gate of the junction field effect transistor; the gate of the junction field effect transistor is connected to the voltage divider position on the voltage divider structure, the drain is connected to the tap provided on the primary coil, and the source is grounded.

[0039] The working process of the wireless power transmission system based on transformer impedance matching is as follows: Figure 3 As shown; the base station generates a dual-tone signal with a DC component (the frequencies are 、 ), and is sent from the transmitting antenna to the receiving antenna; the time domain waveform of the dual-tone signal is as follows Figure 5 As shown in the figure, the DC component DC in the dual-tone signal is filtered out by coupling capacitor C1 and input into the front-end rectifier for processing. The frequency components of the dual-tone signal after filtering out the DC component DC are f1 and f2 respectively. At this time, the dual-tone signal Expressed as:

[0040]

[0041] Among them, A1 and A2 are the amplitudes of the two frequency components respectively; t is the time series.

[0042] like Figure 6 As shown, in the front-end rectifier, due to the nonlinear characteristics of diode D1, the dual-tone signal When passing through the diode, sum frequency components, difference frequency components and second harmonics will be generated; the signal output by the front-end rectifier Expressed as:

[0043]

[0044] Front-end filter for signal Perform low-pass filtering to make the signal The high-frequency components in the signal are greatly attenuated, leaving only the DC component and the difference frequency component. Expressed as:

[0045]

[0046] The signal input to the primary coil is converted through the transformer After coupling to the secondary coil, the output AC signal enters the terminal rectifier and voltage regulator module; the input voltage of the transformer V in and the output voltage V out The relationship can be expressed as ; Therefore, the equivalent impedance transformation relationship of the transformer is ; Among them, N1 and N2 are the turns of the primary coil and the secondary coil respectively; by adjusting the turns ratio , impedance matching can be achieved. The AC signal output by the transformer is converted into a DC signal through the terminal rectifier and voltage regulator module and then input into the load Z L .

[0047] like Figure 7 As shown in Figure 1, the feedback circuit of the system is optimized for low power scenarios. The circuit only uses resistors R1, R2, reference resistor R3, and junction field effect transistors to form the feedback loop, minimizing the power consumption of the feedback circuit and thus improving the overall efficiency. Under low power conditions, the load Z LSmall changes in impedance can cause impedance mismatch, significantly impacting the overall system efficiency. Therefore, JFETs are used as soft-switching elements. Their voltage-sensitive switching characteristics enable rapid on- and off-state switching when the load changes. Furthermore, JFETs typically have lower drive power than other transistors, further reducing the power consumption of the drive circuit and making them particularly suitable for low-power applications.

[0048] The output voltage of the terminal rectifier voltage regulator module is divided to generate the feedback voltage V fb , the feedback voltage V fb It is used to control the conduction state of the junction field effect transistor (JFET), thereby dynamically adjusting the turns ratio at both ends of the transformer to cope with the impact of load changes on system efficiency.

[0049] In the feedback loop, the on and off states of the junction field effect transistor depend on the gate-source voltage V gs With the threshold voltage V th Since the source of the junction field effect transistor in this circuit is grounded, the gate-source voltage V gs The value is equal to the gate voltage V g , and the gate voltage V g By the feedback voltage V fb control.

[0050] Specifically, when V g >V th When the junction field effect tube is turned on, the current path of the primary coil is as follows: Figure 7 As shown by the blue arrow, the current flows from the center tap of the transformer to the ground terminal, and the turns ratio is n1:n2; where n1 is the number of turns of the secondary coil; n2 is the number of turns between the primary coil tap and the terminal away from ground.

[0051] When V g <V th When the junction field effect tube is turned off, the current path of the primary coil is as follows: Figure 7 As shown by the brown arrow, the turns ratio becomes n1:n3; n3 is the number of turns of the primary coil, and the turns ratio is reduced.

[0052] By switching the JFET's on and off states, the turns ratio can be dynamically adjusted. This method can effectively reduce impedance mismatches caused by load changes, thereby improving the system's adaptability and efficiency in low-power applications.

[0053] In some implementations, one of a MOSFET (field effect transistor), an IGBT (insulated gate bipolar transistor), and a GaN (gallium nitride) transistor is selected as the switch in the feedback loop.

[0054] Example 2

[0055] The difference from Example 1 is that this embodiment combines multiple operational amplifiers and multiple junction field-effect transistors in the feedback loop to perform multi-stage adjustment on the number of turns of the primary coil.

[0056] like Figure 8 As shown, a wide dynamic load wireless energy transmission system based on dual-tone signal includes a transmitter and a receiver; the transmitter includes a base station and a transmitting antenna connected in sequence; the receiving end includes a receiving antenna, a coupling capacitor C1, a front-end rectifier and voltage regulator module, a transformer, a terminal rectifier and voltage regulator module, a feedback loop and a load Z L . The front-end rectifier and voltage regulator module includes a front-end rectifier and a front-end filter; the front-end rectifier includes a diode D1, an inductor L1 and a capacitor C2; one end of the coupling capacitor C1 is connected to the receiving antenna, and the other end is connected to one end of the diode D1 and the capacitor C2 respectively; the other ends of the diode D1 and the capacitor C2 are connected to one end of the inductor L1, and the other end of the inductor L1 is grounded. The front-end filter includes an inductor L2 and a capacitor C3; one end of the inductor L2 is connected to the positive electrode of the diode D1, and the other end is grounded through the capacitor C3. The transformer includes a primary coil and a secondary coil coupled to each other; one end of the primary coil is connected to the end of the capacitor C3 away from the ground, and the other end is grounded; taps are provided at three different positions on the primary coil; one end of the secondary coil is connected to the input end of the terminal rectifier and voltage regulator module, and the other end is grounded. The terminal rectifier and voltage stabilization module includes a diode D2, an inductor L3, a capacitor C4 and a capacitor C5; the positive electrode of the diode D2 is connected to the input end of the terminal rectifier and voltage stabilization module, and the negative electrode of the diode D2 is grounded through two parallel branches; the first branch is provided with a capacitor C4; the second branch is provided with an inductor L3 and a capacitor C5 connected in series.

[0057] The feedback loop includes a voltage divider structure and three switching components; the voltage divider structure is connected in parallel to the load Z L The voltage divider structure includes resistors R1 and R2 connected in series. The three switching components each include a junction field-effect transistor (JFET), an operational amplifier (OPA), and a reference resistor. The three JFETs are J1, J2, and J3. The three operational amplifiers are U1, U2, and U3. The three reference resistors are R3, R4, and R5. The drain of the JFET is connected to a tap on the primary coil. The source of the JFET is grounded. The gate of the JFET is connected to the output of the operational amplifier. The negative input of the operational amplifier is connected to the voltage divider position on the voltage divider structure. The positive input of the operational amplifier is connected between the reference resistor and the reference voltage. The three reference resistors are connected in series between the reference voltage and ground.

[0058] The process of achieving four-level changes in the feedback loop of this wireless power transmission system is as follows:

[0059] The resistors R1 and R2 divide the output voltage of the terminal rectifier voltage regulator module to generate a feedback voltage V fb At the same time, a reference voltage is introduced, and different reference voltages V are generated through reference resistors R3, R4 and R5 respectively. ref1 、V ref2 、V ref3 and feed it into the positive input of the three operational amplifiers. At the same time, the feedback voltage V fb Feed into the negative input of the operational amplifier.

[0060] Assuming load Z L Starting from the maximum value of the matching range, the load value is positively correlated with the output voltage, and the feedback voltage V fb Proportional to the output voltage; if the load is near the maximum value, that is, V fb > V ref1 >V ref2 >V ref3 When the three operational amplifiers all output low voltage, the three junction field effect transistors are all in the cut-off state, and the turns ratio of the secondary coil to the primary coil is 4:4; if different reference voltages and feedback voltages V fb The voltage relationship becomes V ref1 > V fb > V ref2 > V ref3 At this time, the junction field effect transistor J1 is turned on, and the turns ratio of the secondary coil to the primary coil is 4:3; if the load is further reduced, the different reference voltages and the feedback voltage V fb The voltage relationship becomes V ref1 >V ref2 >V fb > V ref3 At this time, the junction field effect transistor J2 is turned on, and the turns ratio of the secondary coil to the primary coil is 4:2; if the reference voltage and feedback voltage V fb The voltage relationship becomes V ref1 >V ref2 > V ref3 >V fb At this time, the junction field effect tube J3 is turned on, and the turns ratio of the secondary coil to the primary coil is 4:1. L As the voltage decreases, JFETs J1, JFET J2, and JFET J3 are turned on in sequence, and the turns ratio increases continuously, effectively overcoming the impedance mismatch problem caused by load changes. This multi-stage adjustment method can increase the response accuracy to load changes and effectively improve the matching performance of the circuit, ensuring stable operation of the system under different load conditions.

Claims

1. A wide dynamic load wireless energy transmission method based on dual-tone signal, the wide dynamic load wireless energy transmission system used includes a transmitting end and a receiving end; the receiving end includes a feedback loop and a receiving antenna, a coupling capacitor C1, a front-end rectifier and voltage regulator module, a transformer, a terminal rectifier and voltage regulator module and a load Z connected in sequence L The front-end rectifier and voltage regulator module includes a front-end rectifier and a front-end filter; characterized in that: The feedback loop includes a voltage divider structure and a switching component; the voltage divider structure is connected in parallel to the load Z L two ends; the switching component includes a soft switching element and a reference resistor; the primary coil of the transformer is provided with a connection structure located between the input end and the ground end; the soft switching element is connected between the connection structure of the primary coil of the transformer and the ground end; the control interface of the soft switching element is connected to the voltage dividing position on the voltage dividing structure and is connected to the ground wire through the reference resistor; The feedback loop includes a plurality of switching components; the number of connection structures on the primary coil is equal to and corresponds to the number of switching components; different connection structures are arranged at different positions on the primary coil; the switching components also include an operational amplifier; the negative input terminal of the operational amplifier is connected to the voltage divider structure; the operational amplifier is arranged between the voltage divider structure and the soft switching element; The wide dynamic load wireless energy transmission method comprises the following steps: the transmitting end transmits a dual-tone signal with a DC component; the receiving antenna receives the dual-tone signal and processes the dual-tone signal in sequence through a coupling capacitor C1, a front-end rectifier, a front-end filter, a transformer, and a terminal rectifier and voltage stabilization module, and then inputs the dual-tone signal into the load Z L ; The resistors R1 and R2 in the feedback loop divide the output voltage of the terminal rectifier and voltage regulator module to obtain the feedback voltage. V fb , and input to the negative input terminal of the operational amplifier; the reference resistor generates a reference voltage V ref , and input into the positive input terminal of the operational amplifier; by comparing the reference voltage V ref and feedback voltage V fb The size of controls the on and off of the soft switching element and adjusts the turns ratio of the secondary coil to the primary coil; The coupling capacitor C1 filters out the DC component in the dual-tone signal; the front-end rectifier generates the sum frequency component, the difference frequency component and the second harmonic, and the output signal ; The front-end filter is used to filter the signal Perform low-pass filtering to retain only the signal The DC component and difference frequency component in the output signal The transformer inputs the signal of the primary coil After coupling to the secondary coil, the output AC signal enters the terminal rectifier voltage regulator module; the terminal rectifier voltage regulator module converts the AC signal output by the transformer into a DC signal and then inputs it into the load Z L .

2. The method for wireless energy transmission of a wide dynamic load based on a dual-tone signal according to claim 1, wherein: The output end of the operational amplifier is connected to the gate of the soft switching element; the positive input end of the operational amplifier is connected between the reference resistor and the reference voltage; and the negative input end of the operational amplifier is connected to the voltage divider structure.

3. The method for wireless energy transmission of a wide dynamic load based on a dual-tone signal according to claim 1, wherein: The order of arrangement of the reference resistors of each switching component along the reference voltage to the ground line is consistent with the order of the connection structures corresponding to each switching component along the ground end to the input end of the primary coil.

4. The method for wireless energy transmission of a wide dynamic load based on a dual-tone signal according to claim 1, wherein: The soft switching element adopts a junction field effect tube.

5. The method for wireless energy transmission of a wide dynamic load based on a dual-tone signal according to claim 1, wherein: The front-end rectifier and voltage stabilization module includes a front-end rectifier and a front-end filter; the front-end rectifier includes a diode D1, an inductor L1, and a capacitor C2; one end of the coupling capacitor C1 is connected to the receiving antenna, and the other end is connected to the diode D1 and one end of the capacitor C2; the other ends of the diode D1 and the capacitor C2 are connected to one end of the inductor L1, and the other end of the inductor L1 is grounded; the front-end filter includes an inductor L2 and a capacitor C3; one end of the inductor L2 is connected to the other end of the coupling capacitor C1; the other end of the inductor L2 is grounded through the capacitor C3; The terminal rectifier and voltage stabilization module includes a diode D2, an inductor L3, a capacitor C4 and a capacitor C5; the positive electrode of the diode D2 is connected to the input end of the terminal rectifier and voltage stabilization module, and the negative electrode of the diode D2 is grounded through two parallel branches; the first branch is provided with a capacitor C4; the second branch is provided with an inductor L3 and a capacitor C5 connected in series.

6. The method for wireless energy transmission of a wide dynamic load based on a dual-tone signal according to claim 1, wherein: The operating power of this wireless energy transmission system is 1mW~200mW.

7. The method for wireless energy transmission of a wide dynamic load based on a dual-tone signal according to claim 1, characterized in that: The turns ratio of the secondary coil to the primary coil is adjusted through multiple stages; the number of stages adjusted is equal to the number of soft switching elements plus one.

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