Wide dynamic load wireless energy transmission system and method based on dual-tone signal

Abstract

The 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 a circuit structure through a feedback loop to realize impedance matching; the feedback loop comprises a voltage dividing structure and a switching assembly; the switching assembly comprises a junction field effect transistor, an operational amplifier and a reference resistor; different connecting structures are arranged at different positions on the primary coil; drain electrodes of the junction field effect transistors are connected with the corresponding connecting structures; the source electrode of the junction field effect transistor is grounded; the grid electrode of the junction field effect transistor is connected with the output end of the operational amplifier; the negative input end of the operational amplifier is connected to the voltage dividing structure; the positive input end of the operational amplifier is connected between the reference resistor and the reference voltage. Efficient power transmission can be maintained under the dynamic load condition, the control structure is remarkably simplified, and the complexity and cost of the system are reduced.

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 an important role in modern electronic devices. It transmits energy between the transmitter and the receiver through radio frequency or microwave signals to achieve efficient wireless transmission of electrical energy. This technology is widely used in scenarios ranging from low-power radio frequency identification (RFID) to higher power demand IoT and medical devices. Especially in low-power applications (such as in the range of 1~200mW), the effectiveness of WPT technology plays a decisive role in system performance. Low-power WPT systems need to ensure efficient and stable power transmission under extreme energy budgets. In these low-power applications, WPT systems usually require efficient rectification and impedance matching to minimize transmission losses and improve the overall energy efficiency of the system.

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

[0004] like Figure 1 As shown in the figure, the design based on the Zeta converter adjusts the parameters of the converter to adaptively adjust the matching of the input and load impedances to ensure a stable improvement in the power conversion efficiency (PCE). Impedance matching is accomplished by inductors L1 and L2 and coupling capacitor C1. The Zeta converter operates in discontinuous conduction mode (DCM). When the switch is turned on, 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 a 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 the figure, the isolated SEPIC converter uses the 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 work of inductor L1, inductor L2, and coupling capacitor C1. Specifically, when switch S1 is turned on, inductor L1 begins to store energy, and capacitor C1 transfers part of the charge to inductor L2 to maintain the current supply of the load. With the switching operation of S1, the inductor and capacitor alternately transfer energy in different modes to maintain the stability of the voltage at the load end. By adjusting the duty cycle of the switch, the input impedance of the SEPIC converter can dynamically adapt to different loads, thereby achieving efficient impedance matching.

[0006] These topologies achieve dynamic impedance matching by adjusting the duty cycle in real time, which significantly improves the power conversion efficiency (PCE) and can maintain efficient energy transmission under large load changes, reducing the reliance on traditional independent matching networks and reducing system complexity. However, this type of design requires high control accuracy, especially when the load changes rapidly, the dynamic response speed is limited, and in order to achieve efficient dynamic feedback, these topologies often require more components. In addition, DCDC converters have inherent switching losses under high-frequency operation, which will cause a significant reduction in power conversion efficiency (PCE) under low-power conditions (1-200mW), dragging down the overall performance of the system.

[0007] Another commonly used implementation method is to achieve impedance matching based on adjusting the turns ratio of the transformer. This type of design, such as forward and flyback conversion, can achieve high energy transmission efficiency in different voltage ranges, and has the advantage of electrical isolation, which is suitable for a variety of WPT scenarios. The impedance matching part is achieved through the synergy of transformers TR1 and TR2. First, TR1 converts the collected low-voltage signal to a voltage range suitable for the startup circuit by adjusting the turns ratio between the primary and secondary sides, thereby achieving preliminary impedance matching. After startup, TR2 continues to fine-tune the input impedance of the system, dynamically adapting to different load conditions through its transformer characteristics, so that the impedance of the load end matches the input end, optimizing the energy transmission efficiency. TR1 and TR2 work together to ensure effective impedance matching under different voltage and load conditions.

[0008] However, this type of method has some shortcomings: First, the impedance adjustment of the transformer usually relies on the preset turns ratio or limited switching options, which has a slow response speed when the load changes frequently, making it difficult to achieve real-time precise adjustment. In addition, in order to achieve precise impedance matching, it is usually necessary to design a complex circuit switching structure, which increases the complexity and cost of the system, and has poor adaptability outside of a specific frequency and load range. Therefore, it is not as ideal as other dynamic adjustment technologies in scenarios where load and power conditions fluctuate frequently. 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 component includes a soft switch element and a reference resistor; the primary coil of the transformer is provided with a connection structure between the input end and the ground end; the soft switch element is connected between the connection structure of the primary coil of the transformer and the ground end. The control interface of the soft switch element is connected to the voltage dividing position on the voltage dividing structure and is connected to the ground wire 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 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 arrangement order of the reference resistors of each switching component from the reference voltage to the ground line is consistent with the order of the connection structures corresponding to each switching component from 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 rectifying and voltage stabilizing module comprises a front-end rectifier and a front-end filter; the front-end rectifier comprises 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 end of the diode D1 and the capacitor C2 is connected to one end of the inductor L1, and the other end of the inductor L1 is grounded; the front-end filter comprises 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; The terminal rectifier and voltage regulator 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 regulator 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.

[0017] Preferably, the operating frequency of the wireless power transmission system is 1mW~200mW.

[0018] 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, and 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 regulator module, and then inputs 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 conduction and shutdown of the soft switching element and adjusts the turns ratio of the secondary coil to the primary coil.

[0019] As a preferred embodiment, 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 for 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 and voltage regulator module; the terminal rectifier and voltage regulator module converts the AC signal output by the transformer into a DC signal and then inputs it into the load Z L .

[0020] Preferably, the turns ratio of the secondary coil to the primary coil is adjusted in multiple stages; the number of stages adjusted is equal to the number of soft switch elements plus one.

[0021] The present invention has the following beneficial effects: 1. The present invention can not only maintain efficient power transmission under dynamic load conditions by dynamically changing the circuit structure and simplifying the control strategy, but also improve the adaptability and stability of the system under dynamic load conditions. It also significantly simplifies the control structure, and only requires a basic resistance feedback loop to achieve dynamic feedback, reducing system complexity and cost. At the same time, the present invention has the characteristics of low power consumption. In low-power (such as 1~200mW) application scenarios, it can effectively optimize energy transmission efficiency and reduce power loss, enhancing the stability of the wireless power transmission system and the adaptability of impedance matching.

[0022] 2. The present invention realizes 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, adapt to a variety of power transmission scenarios, and achieve a nearly full impedance matching effect.

[0023] 3. The present invention adopts JFET soft switch and utilizes fast on-and-off adjustment to significantly shorten the dynamic response time, and can complete impedance matching adjustment within milliseconds, ensuring that energy transmission in the range of 1~200mW 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

[0024] Figure 1 The topological structure diagram of the Zeta converter; (a) is the schematic diagram; (b) is the actual diagram.

[0025] Figure 2 The Sepic converter structure diagram, where (a) is the schematic diagram and (b) is the actual diagram.

[0026] Figure 3 This is a system workflow diagram of Example 1 of the present invention.

[0027] Figure 4 This is a schematic diagram of the system structure of Example 1 of the present invention.

[0028] Figure 5 This is a time domain waveform diagram of a dual-tone signal according to Embodiment 1 of the present invention.

[0029] Figure 6 This is a waveform change diagram of the dual-tone signal in the process of rectification and filtering in Example 1 of the present invention.

[0030] Figure 7 This is a feedback diagram of Example 1 of the present invention.

[0031] Figure 8 This is a feedback diagram of Embodiment 2 of the present invention. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings.

[0033] Example 1 like Figure 3 and 4 As shown, a wide dynamic load wireless energy transmission system based on dual-tone signals focuses on high-efficiency 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 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; 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 regulator 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 regulator 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.

[0034] 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.

[0035] 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 DC (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 5As 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. It is expressed as:

[0036] Among them, A1 and A2 are the amplitudes of two frequency components respectively; t is the time series.

[0037] like Figure 6 As shown, in the front-end rectifier, due to the nonlinear characteristics of diode D1, the two-tone signal When passing through the diode, sum frequency components, difference frequency components and second harmonics are generated; the signal output by the front-end rectifier It is expressed as: 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. It is expressed as: The signal input to the primary coil is transmitted through the transformer After coupling to the secondary coil, the output AC signal enters the terminal rectifier and voltage regulator module; the input voltage V in and output voltage V out The relationship can be expressed as ; Therefore, the equivalent impedance transformation relationship of the transformer is ; Where 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 .

[0038] like Figure 7 As shown in the figure, 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 a feedback loop, which minimizes the power consumption of the feedback circuit and improves the overall efficiency. Under low power conditions, the load Z LA small change in the impedance may cause impedance mismatch, which has a significant impact on the overall efficiency of the system. For this reason, JFET is used as a soft switching element, whose voltage-sensitive switching characteristics can achieve fast turn-on and turn-off when the load changes. At the same time, compared with other transistors, the driving power of JFET is usually smaller, which further reduces the power consumption of the driving circuit, especially suitable for low-power application scenarios.

[0039] The output voltage of the terminal rectifier and 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.

[0040] 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.

[0041] 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 the ground.

[0042] 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.

[0043] By switching the JFET on and off, the turns ratio can be dynamically adjusted. This method can effectively reduce the impedance mismatch caused by load changes, thereby improving the system's adaptability and efficiency in low-power application scenarios.

[0044] 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 a switch in the feedback loop.

[0045] Example 2 The difference from Embodiment 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.

[0046] like Figure 8 As shown, a wide dynamic load wireless energy transmission system based on dual-tone signal includes a transmitting end and a receiving end; the transmitting end 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 rectifying and voltage regulating module, a transformer, a terminal rectifying and voltage regulating module, a feedback loop and a load Z L . 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 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 rectification and voltage regulation module, and the other end is grounded. The terminal rectifier and voltage regulator 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 regulator 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.

[0047] 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 two ends; the voltage divider structure includes resistors R1 and R2 connected in series; the three switching components all include junction field effect transistors, operational amplifiers and reference resistors; the three junction field effect transistors 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 junction field effect transistor is connected to the tap provided on the primary coil; 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 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 the ground wire.

[0048] The process of achieving four-level changes in the feedback loop in this wireless power transmission system is as follows: The resistors R1 and R2 divide the output voltage of the terminal rectifier and voltage regulator module to generate a feedback voltage V fbAt the same time, a reference voltage is introduced to generate different reference voltages V through reference resistors R3, R4 and R5. 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.

[0049] Assuming the 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 transistor J3 is turned on, and the turns ratio of the secondary coil to the primary coil is 4:1. L As the voltage decreases, the JFET J1, JFET J2 and JFET J3 are turned on in sequence, and the turns ratio increases continuously, thereby effectively overcoming the impedance mismatch problem caused by load changes. Through this multi-level adjustment method, the response accuracy to load changes can be increased, and the matching performance of the circuit can be effectively improved, ensuring the stable operation of the system under different load conditions.

Claims

1. A wide dynamic load wireless energy transmission system based on dual-tone signal, comprising a transmitting end and a receiving end; the receiving end comprises 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 ; It is characterized by: 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.

2. A wide dynamic load wireless energy transmission system based on dual-tone signal according to claim 1, characterized in that: The feedback loop includes multiple 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 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; the operational amplifier is arranged between the voltage divider structure and the soft switching element.

3. A wide dynamic load wireless energy transmission system based on dual-tone signal according to claim 2, characterized in that: 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.

4. A wide dynamic load wireless energy transmission system based on dual-tone signal according to claim 2, characterized in that: The arrangement order 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 of the primary coil to the input end.

5. A wide dynamic load wireless energy transmission system based on dual-tone signal according to claim 1, characterized in that: The soft switch element adopts a junction field effect transistor.

6. A wide dynamic load wireless energy transmission system based on dual-tone signal according to claim 1, characterized in that: The front-end rectifying and voltage stabilizing 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; The terminal rectifier and voltage regulator 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 regulator 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.

7. A wide dynamic load wireless energy transmission system based on dual-tone signal according to claim 1, characterized in that: The operating frequency of this wireless power transmission system is 1mW~200mW.

8. A method for wireless energy transmission of a wide dynamic load based on a dual-tone signal, characterized in that: Using a wide dynamic load wireless energy transmission system based on a dual-tone signal as described in claim 2, 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 regulator module, and then inputs the dual-tone signal to a 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 conduction and shutdown of the soft switching element and adjusts the turns ratio of the secondary coil to the primary coil.

9. The method for wireless energy transmission of a wide dynamic load based on a dual-tone signal according to claim 8, characterized in that: 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 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 and voltage regulator module; the terminal rectifier and voltage regulator module converts the AC signal output by the transformer into a DC signal and then inputs it into the load Z L .

10. The method for wireless energy transmission of a wide dynamic load based on a dual-tone signal according to claim 8, characterized in that: The turns ratio of the secondary coil to the primary coil is adjusted in multiple stages; the number of stages adjusted is equal to the number of soft switch elements plus one.

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