Wireless power transmission circuit based on active disturbance rejection control

Abstract

The utility model discloses a wireless electric energy transmission circuit based on active-disturbance-rejection control. The wireless electric energy transmission circuit comprises a primary side circuit, a secondary side circuit and an active-disturbance-rejection controller, the primary side circuit transmits current and voltage signals of an alternating current power supply to an inductor L2 of the secondary side circuit through magnetic coupling of an inductor L1; the secondary side circuit transmits current and voltage signals received by the inductor L2 to a load RL after being boosted by the rectifying circuit and the Boost circuit; the active disturbance rejection controller can carry out closed-loop control on the current of the secondary side circuit. The beneficial effects of the utility model are that through closed-loop control of the active-disturbance-rejection controller, current stability can be maintained even under the condition of load change or external interference, current fluctuation can be effectively suppressed, and electric energy transmission efficiency can be improved, thereby improving system stability; the boost of the receiving current is realized through the boost effect of the Boost circuit, so that the requirements of different loads on the voltage can be met, and the flexibility and the practicability of the system are improved.

Description

Technical Field

[0001] This utility model relates to the field of power transmission and control technology, and in particular to a circuit for wireless power transmission based on active disturbance rejection control. Background Technology

[0002] Wireless power transfer technology, as a cutting-edge energy transmission method, has received widespread attention and rapid development in recent years in fields such as electric vehicles, portable electronic devices, and smart homes. This technology uses electromagnetic fields as a medium to achieve wireless power transmission, offering significant advantages such as no physical contact and flexible deployment. With the gradual standardization of wireless charging standards and the improvement of power levels, wireless power transfer technology is gradually expanding from low-power applications to high-power applications, and the requirements for its transmission efficiency and system stability are also increasing.

[0003] However, existing technologies still have certain shortcomings in terms of the stability and efficiency of wireless power transmission. On the one hand, due to load changes and external environmental interference, the output current of existing systems fluctuates significantly, making precise control difficult. On the other hand, the adaptability and robustness of traditional control strategies in the face of system parameter changes and external disturbances need to be strengthened. In addition, there is room for improvement in existing technologies in terms of improving the power factor, optimizing resonant frequency matching, and enhancing the overall energy efficiency of the system. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0005] In view of the problems existing in the above or prior art, this utility model is proposed.

[0006] Therefore, the purpose of this invention is to provide a wireless power transfer circuit based on active disturbance rejection control, wherein the active disturbance rejection controller performs closed-loop control on the current of the secondary circuit, effectively suppressing current fluctuations caused by load changes and external disturbances, and improving the stability of the system.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a wireless power transmission circuit based on active disturbance rejection control, comprising a primary side circuit, a secondary side circuit, and an active disturbance rejection controller; the primary side circuit transmits the current and voltage signals of the AC power supply to the inductor L2 of the secondary side circuit through inductor L1 via magnetic coupling; the secondary side circuit transmits the current and voltage signals received by inductor L2 to the load RL after being boosted by a rectifier circuit and a boost circuit; the active disturbance rejection controller can perform closed-loop control of the current of the secondary side circuit.

[0008] As a preferred embodiment of the wireless power transmission circuit based on active disturbance rejection control described in this utility model, the primary side circuit includes a full-bridge inverter module and a first resonant module, and the analog signal is modulated and transmitted to the first resonant module through the full-bridge inverter module.

[0009] As a preferred embodiment of the wireless power transmission circuit based on active disturbance rejection control described in this utility model, the full-bridge inverter module includes first transistors Q1, Q2, Q3 and Q4. The first transistors Q1, Q2, Q3 and Q4 receive feedback from the feedback network through their bases and alternately conduct to generate high-frequency AC signals.

[0010] As a preferred embodiment of the wireless power transmission circuit based on active disturbance rejection control described in this utility model, the first resonant module includes a resonant inductor L3. The resonant inductor L3 and the first transistors Q1, Q2, Q3 and Q4 are alternately turned on to form a resonance and generate a high-frequency oscillating current. The current is detected and the oscillation of the resonant circuit is reduced by damping resistors R1 and R3. The resonant frequency is adjusted by the resonant capacitor C3 and the resonant inductor L3 and transmitted to the inductor L2. The resonant capacitor C3 stores energy when the switching element is turned off.

[0011] In a preferred embodiment of the wireless power transmission circuit based on active disturbance rejection control described in this utility model, the first resonant module is further provided with a compensation capacitor C1 to improve the power factor of the primary circuit.

[0012] In a preferred embodiment of the wireless power transmission circuit based on active disturbance rejection control described in this utility model, the secondary side circuit is further provided with a second resonant module; the inductor L2 of the second resonant module receives current and voltage signals through magnetic coupling with the inductor L1 of the first resonant module; the inductor L2 receives the current and voltage signals, adjusts the resonant frequency through the resonant capacitor C2 to match the transmission efficiency, and detects the current and reduces the oscillation of the resonant circuit through the damping resistor R2.

[0013] As a preferred embodiment of the wireless power transmission circuit based on active interference rejection control described in this utility model, the rectifier circuit includes a full-wave rectifier bridge composed of diodes D1, D2, D3 and D4; diodes D1, D2, D3 and D4, and convert AC power into DC power through diodes D1, D2, D3 and D4.

[0014] In a preferred embodiment of the wireless power transfer circuit based on active disturbance rejection control described in this utility model, the Boost circuit includes a transistor Q5; the collector of transistor Q5 is connected to the boost inductor L4, and the collector of transistor Q5 is also connected to the anode of diode D5; the emitter of transistor Q5 is connected to capacitor C4, and the emitter of transistor Q5 is also connected to the load RL; the base of transistor Q5 is connected to the output terminal of the active disturbance rejection controller.

[0015] As a preferred embodiment of the wireless power transfer circuit based on active disturbance rejection control described in this utility model, the Boost circuit further includes a boost inductor L4, a filter capacitor C4 and a filter capacitor C5, and a freewheeling diode D5; the boost inductor L4, the freewheeling diode D5 and the transistor Q5 work together to boost the voltage to the level required by the load.

[0016] As a preferred embodiment of the wireless power transfer circuit based on active disturbance rejection control described in this utility model, the active disturbance rejection controller includes a sampling module for acquiring the current of the sampling resistor Req, a target current module for setting the system target current, an ADRC controller for comparing the sampled current with the target current, and a PWM modulation for generating a PWM signal; the active disturbance rejection controller also has a PWM amplitude limit, which ensures that the amplitude of the PWM signal is within a safe range.

[0017] The beneficial effects of this utility model are as follows: This utility model uses an active disturbance rejection controller to perform closed-loop control of the current in the secondary circuit, which can maintain the stability of the current even under load changes or external interference, effectively suppressing current fluctuations, significantly reducing current fluctuations, improving the efficiency of power transmission, and thus improving the stability and reliability of the system; the boost circuit's voltage boosting effect enables the receiving current to be boosted, which can not only adapt to the voltage requirements of different loads, but also improve the flexibility and practicality of the system. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0019] Figure 1 This is a schematic diagram of the overall structure of a wireless power transfer circuit based on active disturbance rejection control.

[0020] Figure 2 A structural diagram showing the addition of an active disturbance rejection controller to the secondary circuit of a wireless power transfer circuit based on active disturbance rejection control. Detailed Implementation

[0021] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0022] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0023] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0024] Example 1

[0025] Reference Figures 1-2 This is the first embodiment of the present invention. This embodiment provides a wireless power transmission circuit based on active disturbance rejection control, which includes a secondary side circuit 200 receiving current and voltage signals of AC power transmitted from the primary side circuit 100 through magnetic coupling, and an active disturbance rejection controller 300 controlling the current of the secondary side circuit 200 through closed-loop control, which can dynamically adjust the operating state of the circuit to adapt to load changes and external disturbances.

[0026] Furthermore, a wireless power transfer circuit based on active disturbance rejection control includes a primary side circuit 100, a secondary side circuit 200, and an active disturbance rejection controller 300. The primary side circuit 100 transmits the current and voltage signals of the AC power supply to the inductor L2 of the secondary side circuit 200 through magnetic coupling of inductor L1. The secondary side circuit 200 transmits the current and voltage signals received by inductor L2 to the load RL after being boosted by rectifier circuit 201 and boost circuit 202. The active disturbance rejection controller 300 can perform closed-loop control of the current of the secondary side circuit 200.

[0027] In summary, the beneficial effects of a wireless power transfer circuit based on active disturbance rejection control are that, through precise current control and voltage regulation, the circuit can adapt to different operating conditions. By using active disturbance rejection control technology, the efficiency and stability of wireless power transfer are optimized, especially under load changes and external disturbances, thereby improving the practicality and reliability of wireless power transfer.

[0028] Example 2

[0029] Reference Figure 1 This is the second embodiment of the present invention. Unlike the previous embodiment, this embodiment provides a wireless power transmission circuit based on active disturbance rejection control, which includes a full-bridge inverter module 101 that alternately conducts to generate high-frequency AC signals; a first resonant module 102 and a second resonant module 203 that optimize the efficiency of power transmission.

[0030] Furthermore, the primary side circuit 100 includes a full-bridge inverter module 101 and a first resonant module 102. The analog signal is modulated by the full-bridge inverter module 101 and then transmitted to the first resonant module 102.

[0031] Furthermore, the full-bridge inverter module 101 includes first transistors Q1, Q2, Q3 and Q4. The first transistors Q1, Q2, Q3 and Q4 receive feedback from the feedback network through their bases and alternately conduct to generate high-frequency AC signals.

[0032] Furthermore, the first resonant module 102 includes a resonant inductor L3. The resonant inductor L3 and the first transistors Q1, Q2, Q3 and Q4 are alternately turned on to form a resonance and generate a high-frequency oscillating current. The current is detected by damping resistors R1 and R3 and the oscillation of the resonant circuit is reduced. The resonant frequency is adjusted by the resonant capacitor C3 and the resonant inductor L3 and transmitted to the inductor L2. The resonant capacitor C3 stores energy when the switching element is turned off.

[0033] Furthermore, the first resonant module 102 is also provided with a compensation capacitor C1 to improve the power factor of the primary circuit.

[0034] Furthermore, the secondary side circuit 200 is also provided with a second resonant module 203; the inductor L2 of the second resonant module 203 receives current and voltage signals through magnetic coupling with the inductor L1 of the first resonant module 102; the inductor L2 receives current and voltage signals, adjusts the resonant frequency through the resonant capacitor C2 to match the transmission efficiency, and detects the current and reduces the oscillation of the resonant circuit through the damping resistor R2.

[0035] Furthermore, the rectifier circuit 201 includes a full-wave rectifier bridge composed of diodes D1, D2, D3 and D4; and converts AC power into DC power through diodes D1, D2, D3 and D4.

[0036] In operation, the analog signal first generates a high-frequency AC signal by switching on the first transistors Q1, Q2, Q3, and Q4. The resonant frequency is adjusted by the resonant inductor L3 and the resonant capacitor C3 and then transmitted to the inductor L1. The compensation capacitor C1 improves the power factor of the circuit during this process. The inductor L2 receives the current and voltage information transmitted by the inductor L1 through magnetic coupling. The resonant frequency is adjusted by the resonant capacitor C2, and the current is detected by the damping resistor R2, which reduces the oscillation of the resonant circuit. Then, the rectifier circuit 201 converts the AC power into DC power through the full-wave rectifier bridge composed of diodes D1, D2, D3, and D4. After the rectified DC power is smoothed by the filter capacitor C4, it is transmitted to the load RL.

[0037] In summary, the beneficial effects of a wireless power transfer circuit based on active disturbance rejection control are: achieving efficient magnetic coupling transmission of electrical energy through the generation of high-frequency AC signals by the full-bridge inverter module, effectively improving the efficiency and distance of power transmission; and reducing energy loss during transmission by using magnetic coupling transmission through the first and second resonant modules, thereby improving the system's transmission efficiency.

[0038] Example 3

[0039] Reference Figure 1 This is the third embodiment of the present invention. Unlike the previous embodiment, this embodiment provides a wireless power transfer circuit based on active disturbance rejection control, which includes a Boost circuit that can adapt to the voltage requirements of different loads.

[0040] Furthermore, the Boost circuit 202 includes a transistor Q5; the collector of transistor Q5 is connected to the boost inductor L4, and the collector of transistor Q5 is also connected to the anode of diode D5; the emitter of transistor Q5 is connected to the filter capacitor C4, and the emitter of transistor Q5 is also connected to the load RL; the base of transistor Q5 is connected to the output terminal of the active disturbance rejection controller 300.

[0041] Furthermore, the Boost circuit 202 also includes a boost inductor L4, filter capacitors C4 and C5, and a freewheeling diode D5; the boost inductor L4, the freewheeling diode D5, and the transistor Q5 work together to boost the voltage to the level required by the load.

[0042] It should be noted that the function of both filter capacitor C4 and filter capacitor C5 is to smooth the output voltage. Filter capacitor C4 is used to smooth the DC current after rectification by rectifier circuit 201, and filter capacitor C5 is used to smooth the current of transistor Q5 boost, so as to reduce voltage fluctuations.

[0043] It should be noted that the resonant inductor L3 is also used to improve power conversion efficiency and reduce switching losses.

[0044] It should be noted that the freewheeling diode D5 ensures that the current in the boost inductor L4 can continue to flow when the transistor Q5 is in operation, thus preventing the current in the inductor from being suddenly interrupted.

[0045] In operation, when transistor Q5 is turned on, current flows through transistor Q5, boost inductor L4, and freewheeling diode D5, storing energy through boost inductor L4. When transistor Q5 is turned off, the energy stored in boost inductor L4 is released through freewheeling diode D5, and simultaneously filtered by filter capacitors C4 and C5, providing a stable DC voltage to the load RL. During this process, freewheeling diode D5 ensures that the current in boost inductor L4 can continue to flow while transistor Q5 is in operation, preventing sudden interruption of current in the inductor.

[0046] In summary, the beneficial effect of a wireless power transfer circuit based on active disturbance rejection control is that, through the boost circuit 202, it can adapt to the voltage requirements of different loads, not only improving energy transfer efficiency and reducing losses, but also enhancing the system's flexibility and practicality.

[0047] Example 4

[0048] Reference Figure 2 This is the third embodiment of the present invention. Unlike the previous embodiment, this embodiment provides a wireless power transfer circuit based on active disturbance rejection control (ADRC). It includes an ADRC controller 300 that adjusts the switching state of transistor Q5 by monitoring current and voltage to achieve stable control of the output voltage.

[0049] Furthermore, the active disturbance rejection controller 300 includes a sampling module 301 for acquiring the current of the sampling resistor Req, a target current module 302 for setting the system target current, an ADRC controller 303 for comparing the sampled current with the target current, and a PWM modulation 304 for generating a PWM signal.

[0050] Furthermore, the active disturbance rejection controller 300 is also equipped with a PWM amplitude limit 305, which ensures that the amplitude of the PWM signal is within a safe range.

[0051] In use, the sampling module 301 monitors the current flowing through the inductor L2 through the detection resistor Req, compares the current information with the setting of the target current module 302, and feeds it back to the ADRC controller 303. The PWM modulation 304 generates a PWM signal based on the output of the ADRC controller 303 to control the switching state of the transistor Q5.

[0052] In summary, the beneficial effects of a wireless power transfer circuit based on active disturbance rejection control are that the active disturbance rejection controller, through the synergistic effect of ADRC controller and PWM modulation, can accurately control the circuit's operating state, optimize power transfer efficiency, and reduce electromagnetic interference, thereby achieving stable control of the output voltage and improving the system's robustness and dynamic performance.

[0053] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0054] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0055] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0056] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A circuit for wireless power transfer based on active disturbance rejection control, characterized in that: include, Primary circuit (100), secondary circuit (200) and active disturbance rejection controller (300); The primary circuit (100) transmits the current and voltage signals of the AC power supply to the inductor L2 of the secondary circuit (200) through magnetic coupling of inductor L1. The secondary side circuit (200) transmits the current and voltage signals received by the inductor L2 to the load RL after being boosted by the rectifier circuit (201) and the boost circuit (202); The active disturbance rejection controller (300) is capable of closed-loop control of the current in the secondary circuit (200).

2. The wireless power transfer circuit based on active interference rejection control as described in claim 1, characterized in that: The primary side circuit (100) includes a full-bridge inverter module (101) and a first resonant module (102). The analog signal is modulated by the full-bridge inverter module (101) and then transmitted to the first resonant module (102).

3. The wireless power transfer circuit based on active disturbance rejection control as described in claim 2, characterized in that: The full-bridge inverter module (101) includes first transistors Q1, Q2, Q3 and Q4. The first transistors Q1, Q2, Q3 and Q4 receive feedback from the feedback network through their bases and alternately conduct to generate high-frequency AC signals.

4. The wireless power transfer circuit based on active disturbance rejection control as described in claim 3, characterized in that: The first resonant module (102) includes a resonant inductor L3. The resonant inductor L3 and the first transistors Q1, Q2, Q3 and Q4 are alternately turned on to form a resonance and generate a high-frequency oscillation current. The current is detected by the damping resistors R1 and R3 and the oscillation of the resonant circuit is reduced. The resonant frequency is adjusted by the resonant capacitor C3 and the resonant inductor L3 and transmitted to the inductor L2. Furthermore, the resonant capacitor C3 stores energy when the switching element is turned off.

5. The wireless power transfer circuit based on active interference rejection control as described in claim 4, characterized in that: The first resonant module (102) is also provided with a compensation capacitor C1 to improve the power factor of the primary circuit.

6. The wireless power transfer circuit based on active interference rejection control as described in claim 5, characterized in that: The secondary side circuit (200) is also provided with a second resonant module (203); The inductor L2 of the second resonant module (203) receives current and voltage signals through magnetic coupling with the inductor L1 of the first resonant module (102); The inductor L2 receives current and voltage signals, adjusts the resonant frequency through the resonant capacitor C2 to match the transmission efficiency, and detects the current through the damping resistor R2 to reduce the oscillation of the resonant circuit.

7. The wireless power transfer circuit based on active disturbance rejection control as described in claim 6, characterized in that: The rectifier circuit (201) includes a full-wave rectifier bridge composed of diodes D1, D2, D3 and D4; The diodes D1, D2, D3, and D4 are used to convert alternating current into direct current.

8. The wireless power transfer circuit based on active interference rejection control as described in claim 7, characterized in that: The Boost circuit (202) includes transistor Q5; The collector of transistor Q5 is connected to boost inductor L4, and the collector of transistor Q5 is also connected to the anode of diode D5. The emitter of transistor Q5 is connected to capacitor C4, and the emitter of transistor Q5 is also connected to load RL; The base of transistor Q5 is connected to the output terminal of the active disturbance rejection controller (300).

9. The wireless power transfer circuit based on active disturbance rejection control as described in claim 8, characterized in that: The Boost circuit (202) also includes a boost inductor L4, a filter capacitor C4 and a filter capacitor C5, and a freewheeling diode D5; The boost inductor L4, freewheeling diode D5, and transistor Q5 work together to boost the voltage to the level required by the load.

10. The wireless power transfer circuit based on active interference rejection control as described in claim 8, characterized in that: The active disturbance rejection controller (300) includes a sampling module (301) for acquiring the current of the sampling resistor Req, a target current module (302) for setting the target current of the system, an ADRC controller (303) for comparing the sampled current with the target current, and a PWM modulation (304) for generating a PWM signal. The active disturbance rejection controller (300) is also provided with a PWM amplitude limit (305), which ensures that the amplitude of the PWM signal is within a safe range.

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