Magnetic coupling resonant wireless power transmission system

Abstract

The invention discloses a magnetic coupling resonant wireless power transmission system, which belongs to the technical field of wireless power transmission and comprises a transmitting end, a magnetic coupling structure and a receiving end. The transmitting end comprises a rectifying circuit, a high-frequency inverter circuit and a first compensation structure; the magnetic coupling structure comprises a transmitting coil and a receiving coil, the rectifying circuit is used for acquiring an external alternating current, converting the external alternating current into a direct current and transmitting the direct current to the high-frequency inverter circuit, so that the high-frequency inverter circuit converts the direct current into a stably output high-frequency alternating current and transmits the high-frequency alternating current to the transmitting coil through the first compensation structure; and the transmitting coil transmits the high-frequency alternating current to a receiving end through electromagnetic coupling. According to the wireless power transmission system, the problems of unstable frequency and low transmission efficiency of a wireless power transmission system in the prior art can be solved, and the stability and efficiency of wireless power transmission are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless power transmission, and in particular to a magnetic coupling resonant wireless power transmission system. Background Art

[0002] Wireless power transmission technologies can be categorized by transmission mechanism into electromagnetic induction, electromagnetic resonance, electromagnetic radiation, laser, electric field coupling, and ultrasonic methods. Electromagnetic induction, electromagnetic resonance, and electric field coupling are near-field coupled wireless power transmission, while electromagnetic radiation and laser are far-field radiative wireless power transmission.

[0003] Electromagnetic induction and electromagnetic resonance wireless power transmission technologies utilize the alternating magnetic field generated by a transmitting coil to couple electrical energy to a receiving coil, thereby achieving wireless power transmission to a load. Electromagnetic induction coupling is a more mature technology, boasting higher transmission power and high efficiency over shorter transmission distances. However, this efficiency decreases rapidly with increasing transmission distance. Electromagnetic resonance, a special case of magnetic induction coupling, achieves efficient non-radiative energy transmission through the magnetic coupling resonance of the transmitting and receiving coils. Its transmission distance is greater than that of magnetic induction, making it a medium-range wireless power transmission technology.

[0004] However, both the electromagnetic induction and electromagnetic resonance circuit structures lack high-frequency inverter circuits and compensation structures, resulting in frequency drift at the transmitter when the existing circuits transmit wireless power, resulting in poor frequency stability at the transmitter, and thus low overall power transmission efficiency of the circuit when transmitting wireless power. Summary of the Invention

[0005] An embodiment of the present invention provides a magnetically coupled resonant wireless power transmission system, which can solve the problem that the existing electromagnetic induction and electromagnetic resonance circuit structures lack a high-frequency inverter circuit and a compensation structure, resulting in the existing circuits having a frequency drift at the transmitting end when transmitting wireless power, resulting in poor frequency stability at the transmitting end. By adding a high-frequency inverter circuit and a first compensation structure, after the rectifier circuit in the transmitting end obtains the external AC current, the high-frequency inverter circuit converts the DC current into a stable high-frequency AC current, which is then stably output to the receiving end through the first compensation structure and the transmitting coil. This can reduce frequency drift, allowing the receiving end to receive more stable wireless power, thereby improving the overall wireless power transmission efficiency of the system.

[0006] An embodiment of the present invention provides a magnetically coupled resonant wireless power transmission system, comprising: a transmitting end, a magnetic coupling structure, and a receiving end;

[0007] The transmitting end includes: a rectifier circuit, a high-frequency inverter circuit and a first compensation structure;

[0008] The magnetic coupling structure includes: a transmitting coil and a receiving coil;

[0009] One end of the rectifier circuit is used to be connected to an external AC power supply, the other end of the rectifier circuit is connected to one end of the high-frequency inverter circuit, the other end of the high-frequency inverter circuit is connected to one end of the first compensation structure, and the other end of the first compensation structure is connected to the transmitting coil; the receiving coil is connected to one end of the receiving end, and the other end of the receiving end is connected to an external load;

[0010] The rectifier circuit is used to obtain external AC current and convert the external AC current into DC current and transmit it to the high-frequency inverter circuit, so that the high-frequency inverter circuit converts the DC current into a high-frequency AC current with a stable output, and transmits the high-frequency AC current to the transmitting coil through the first compensation structure, so that the transmitting coil transmits the high-frequency AC current to the receiving end through electromagnetic coupling.

[0011] Furthermore, the receiving end includes: a second compensation structure and a rectification and filtering circuit;

[0012] One end of the second compensation structure is connected to the receiving coil, and the other end of the second compensation structure is connected to one end of the rectifier and filter circuit;

[0013] The other end of the rectifier and filter circuit is connected to an external load.

[0014] Furthermore, the rectifier circuit includes: a first capacitor, a second capacitor, a first resistor, a second resistor, a first diode and a transistor;

[0015] A first end of the first capacitor is connected to an external AC power supply, and a second end of the first capacitor is grounded;

[0016] The first end of the first resistor is connected to the first end of the first capacitor, the second end of the first resistor is connected to the first end of the second capacitor, and the second end of the second capacitor is grounded;

[0017] The first end of the second resistor is connected to the first end of the first resistor, and the second end of the second resistor is connected to the collector of the transistor;

[0018] The anode of the first diode is connected to the second end of the second capacitor, and the cathode of the first diode is connected to the base of the transistor and the second end of the first resistor respectively.

[0019] Furthermore, the high-frequency inverter circuit includes: a third capacitor, a fourth capacitor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and an integrated circuit;

[0020] The emitter of the transistor is connected to the first end of the third capacitor, and the second end of the third capacitor is grounded;

[0021] The first end of the third resistor is connected to the first end of the third capacitor, and the second end of the third resistor is connected to the first pin of the integrated circuit;

[0022] A first end of the fourth capacitor is connected to the first pin of the integrated circuit, and a second end of the fourth capacitor is connected to the seventh pin of the integrated circuit;

[0023] The first end of the sixth resistor is connected to the second end of the fourth capacitor, and the second end of the sixth resistor is connected to the first end of the third resistor and the eighth pin of the integrated circuit respectively;

[0024] The first end of the fourth capacitor is connected to the second end of the third resistor, and the second end of the fourth resistor is connected to the second pin of the integrated circuit;

[0025] A first end of the fifth resistor is connected to the fourth pin and the sixth pin of the integrated circuit respectively, and a second end of the fifth resistor is grounded;

[0026] The fifth pin of the integrated circuit is grounded, and the third pin of the integrated circuit is connected to the seventh pin of the integrated circuit.

[0027] Furthermore, the first compensation structure includes: a fifth capacitor and a connector;

[0028] The first end of the fifth capacitor is respectively connected to the second pin of the connector and the external AC power supply, and the second end of the fifth capacitor is respectively connected to the external AC power supply and the first end of the transmitting coil;

[0029] The first pin of the connector is connected to the sixth pin of the integrated circuit, the third pin of the connector is grounded, and the third pin of the connector is connected to the second end of the transmitting coil.

[0030] Furthermore, the second compensation structure includes: a sixth capacitor and a seventh capacitor;

[0031] The first end of the sixth capacitor is connected to the first end of the seventh capacitor, and the second end of the sixth capacitor is connected to the second end of the seventh capacitor;

[0032] A first end of the seventh capacitor is connected to a first end of the external load, and a second end of the seventh capacitor is connected to a second end of the external load.

[0033] Furthermore, the rectification and filtering circuit includes: a second diode, a third diode, a fourth diode, a fifth diode and an eighth capacitor;

[0034] The anode of the second diode is connected to the first end of the eighth capacitor, the second end of the eighth capacitor is connected to the first end of the receiving coil, the cathode of the second diode is connected to the cathode of the fourth diode, the anode of the second diode is connected to the cathode of the third diode, the anode of the third diode is connected to the anode of the fifth diode, the anode of the fifth diode is connected to the second end of the sixth capacitor, the cathode of the fifth diode is connected to the anode of the fourth diode, the cathode of the fourth diode is connected to the first end of the sixth capacitor, and the cathode of the fifth diode is connected to the second end of the receiving coil.

[0035] Furthermore, the eighth capacitor is a resonant capacitor.

[0036] Furthermore, the model of the integrated circuit is XKT-801.

[0037] Furthermore, the model of the connector is XKT1151.

[0038] The following beneficial effects are achieved by implementing the present invention:

[0039] The present invention provides a magnetically coupled resonant wireless power transmission system, comprising a transmitting end, a magnetic coupling structure and a receiving end; the transmitting end comprises: a rectifier circuit, a high-frequency inverter circuit and a first compensation structure; the magnetic coupling structure comprises: a transmitting coil and a receiving coil; one end of the rectifier circuit is used to be connected to an external AC power supply, the other end of the rectifier circuit is connected to one end of the high-frequency inverter circuit, the other end of the high-frequency inverter circuit is connected to one end of the first compensation structure, and the other end of the first compensation structure is connected to the transmitting coil; the receiving coil is connected to one end of the receiving end, and the other end of the receiving end is connected to an external load. The system of the present invention solves the problem that the existing electromagnetic induction and electromagnetic resonance circuit structures lack high-frequency inverter circuits and compensation structures, resulting in frequency drift at the transmitter when transmitting wireless power, and poor frequency stability at the transmitter, by adding high-frequency inverter circuits and first compensation structures. By adding high-frequency inverter circuits and first compensation structures, after the rectifier circuit in the transmitter obtains external AC current, the high-frequency inverter circuit converts the DC current into a stable high-frequency AC current, which is then stably output to the receiving end through the first compensation structure and the transmitting coil. This can reduce frequency drift, enable the receiving end to receive more stable wireless power, and thereby improve the overall wireless power transmission efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a structural diagram of a magnetically coupled resonant wireless power transmission system provided by one embodiment of the present invention.

[0041] Figure 2The present invention provides a schematic diagram of a circuit structure of a transmitting end of a magnetically coupled resonant wireless power transmission system according to an embodiment of the present invention.

[0042] Figure 3 The present invention provides a schematic diagram of a circuit structure of a receiving end of a magnetically coupled resonant wireless power transmission system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0044] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions in this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0046] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0047] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0048] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0049] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0050] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0051] like Figure 1 As shown, in order to solve the problem that the existing electromagnetic induction and electromagnetic resonance circuit structures lack high-frequency inverter circuits and compensation structures, resulting in the existing circuits having a transmitter frequency drift when transmitting wireless power, resulting in poor transmitter frequency stability, the present invention provides a magnetic coupling resonant wireless power transmission system, including: a transmitter, a magnetic coupling structure and a receiver;

[0052] The transmitting end includes: a rectifier circuit, a high-frequency inverter circuit and a first compensation structure;

[0053] The magnetic coupling structure includes: a transmitting coil and a receiving coil;

[0054] One end of the rectifier circuit is used to be connected to an external AC power supply, the other end of the rectifier circuit is connected to one end of the high-frequency inverter circuit, the other end of the high-frequency inverter circuit is connected to one end of the first compensation structure, and the other end of the first compensation structure is connected to the transmitting coil; the receiving coil is connected to one end of the receiving end, and the other end of the receiving end is connected to an external load;

[0055] The rectifier circuit is used to obtain external AC current and convert the external AC current into DC current and transmit it to the high-frequency inverter circuit, so that the high-frequency inverter circuit converts the DC current into a high-frequency AC current with a stable output, and transmits the high-frequency AC current to the transmitting coil through the first compensation structure, so that the transmitting coil transmits the high-frequency AC current to the receiving end through electromagnetic coupling.

[0056] Specifically, the magnetically coupled resonant wireless power transmission system of the present invention is primarily composed of three parts: a transmitter, a magnetic coupling structure, and a receiver. The transmitter includes a rectifier circuit, a high-frequency inverter circuit, and a first compensation structure. One end of the rectifier circuit is connected to an external AC power source, the other end of the rectifier circuit is connected to one end of the high-frequency inverter circuit, the other end of the high-frequency inverter circuit is connected to one end of the first compensation structure, and the other end of the first compensation structure is connected to a transmitter coil in the magnetic coupling structure. The transmitter coil and receiver coil in the magnetic coupling structure are wirelessly connected, with data transmission achieved through magnetic field coupling. The receiver coil in the magnetic coupling structure is connected to one end of the receiver, and the other end of the receiver is connected to an external load.

[0057] In a preferred embodiment, the receiving end includes: a second compensation structure and a rectifier filter circuit; one end of the second compensation structure is connected to the receiving coil, and the other end of the second compensation structure is connected to one end of the rectifier filter circuit; the other end of the rectifier filter circuit is connected to an external load.

[0058] Specifically, in the above system structure, the rectifier circuit is used to obtain external AC current generated by an external AC power source. This external AC current is input into the rectifier circuit, where it is converted into DC current. The rectifier circuit transmits the rectified DC current to the high-frequency inverter circuit, which inverts the DC current into high-frequency AC current (the inversion process of the high-frequency inverter circuit is implemented based on field-effect transistors). The high-frequency AC current provides an energy carrier for magnetic field coupling. The high-frequency inverter circuit transmits the high-frequency AC current to the first compensation structure, so that the first compensation structure and the transmitting coil form a resonant circuit. After the first compensation structure and the transmitting coil form a resonant circuit, the resonant circuit can match the high-frequency inverter frequency, improve the magnetic field radiation efficiency and stability between the transmitting coil and the receiving coil, and suppress frequency drift. The first compensation structure inputs a resonant high-frequency AC current into the transmitting coil. The transmitting coil uses electromagnetic induction to convert this high-frequency AC current into an electrical signal in a spatial alternating magnetic field, which is then radiated outward and wirelessly transmitted to the receiving coil via magnetic field coupling. The receiving coil receives the transmitting coil's alternating magnetic field, converts it into a high-frequency induced AC current (this conversion process is the reverse of electromagnetic induction), and transmits this high-frequency induced AC current to the second compensation structure. The second compensation structure receives the high-frequency induced AC current and forms a resonant circuit with the receiving coil. This resonant circuit matches the transmitting frequency, thereby enhancing energy harvesting and reducing energy loss during wireless transmission. The second compensation structure generates a resonant high-frequency AC current through the resonant circuit and transmits this high-frequency AC current to a rectifier and filter circuit. The rectifier and filter circuit rectifies the resonant high-frequency AC current into a stable DC voltage, which is then input into the load, providing stable DC power to the load. In practical applications, this load is typically a device that needs to be charged, such as a battery. Through the above-mentioned magnetically coupled resonant wireless power transmission, the transmitting end can generate stable high-frequency alternating current and provide a stable electromagnetic field for the transmitting coil and the receiving coil under the magnetic coupling structure. When wireless power is transmitted under electromagnetic induction, the frequency drift and electromagnetic field instability caused by unstable current at the transmitting end can be reduced, the frequency stability during wireless power transmission can be improved, and on this basis, the efficiency of wireless power transmission can be improved simultaneously.

[0059] The following is a detailed description of the circuit structures of each part of the present invention. Figure 2 FIG. 1 is a schematic diagram of the circuit structure of the transmitting end of the present invention.

[0060] In a preferred embodiment, the rectifier circuit includes: a first capacitor C4, a second capacitor C1, a first resistor R1, a second resistor R2, a first diode D1, and a transistor Q2; the first end of the first capacitor C4 is connected to an external AC power source AC, and the second end of the first capacitor C4 is grounded; the first end of the first resistor R1 is connected to the first end of the first capacitor C4, the second end of the first resistor R1 is connected to the first end of the second capacitor C1, and the second end of the second capacitor C1 is grounded; the first end of the second resistor R2 is connected to the first end of the first resistor R1, and the second end of the second resistor R2 is connected to the collector (C) of the transistor Q2; the anode of the first diode D1 is connected to the second end of the second capacitor C1, and the cathode of the first diode D1 is connected to the base (B) of the transistor Q2 and the second end of the first resistor R1, respectively. The emitter (E) of the transistor Q2 is connected to the first end of the third capacitor C2 in the high-frequency inverter circuit, and the second end of the third capacitor C2 is grounded.

[0061] In a preferred embodiment, the high-frequency inverter circuit includes: a third capacitor C2, a fourth capacitor C3, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and an integrated circuit U1, wherein the integrated circuit U1 includes eight pins, and the first pin to the eighth pin correspond to Figure 2 The numbers 1 to 8 under U1 indicate that the model of the integrated circuit U1 is XKT-801. The first pin is the power input pin, the second pin is the signal input pin, the third pin is the electrical signal feedback pin, the fourth pin is the signal transmission control pin, the fifth pin is the ground pin, the sixth pin is the signal output pin, the seventh pin is the multi-function pin, and the eighth pin is the frequency control pin. The first end of the third resistor R3 is connected to the first end of the third capacitor C2, and the second end of the third resistor R3 is connected to the first pin of the integrated circuit U1. The first end of the fourth capacitor C3 is connected to the second end of the third resistor R3, and the second end of the fourth capacitor C3 is connected to the first pin of the integrated circuit U1. Seven pins are connected; a first end of the sixth resistor R6 is connected to the second end of the fourth capacitor C3, and a second end of the sixth resistor R6 is respectively connected to the first end of the third resistor R3 and the eighth pin of the integrated circuit U1; a first end of the fourth capacitor C3 is connected to the second end of the third resistor R3, and a second end of the fourth resistor R4 is connected to the second pin of the integrated circuit U1; a first end of the fifth resistor R5 is respectively connected to the fourth pin of the integrated circuit U1 and the sixth pin of the integrated circuit U1, and a second end of the fifth resistor R5 is grounded; the fifth pin of the integrated circuit U1 is grounded, and the third pin of the integrated circuit U1 is connected to the seventh pin of the integrated circuit U1.

[0062] In a preferred embodiment, the first compensation structure includes: a fifth capacitor C6 and a connector Q1, wherein the model of the connector Q1 is XKT1151, and the connector Q1 includes three pins, the first pin is a signal input pin, the second pin is a signal output pin, and the third pin is a power pin. The first pin to the third pin correspond to Figure 2 The first end of the fifth capacitor C6 is connected to the second pin of the connector Q1 and the external AC power supply AC, and the second end of the fifth capacitor C6 is connected to the external AC power supply AC and the first end of the transmitting coil, respectively. The first pin of the connector Q1 is connected to the sixth pin of the integrated circuit U1, and the third pin of the connector Q1 is grounded. The third pin of the connector Q1 is connected to the second end of the transmitting coil.

[0063] In the above circuit structure, transistor Q2 is MMBTA42LT1 G. As a current amplifier, transistors can amplify weak electrical signals. The first diode D1 is MM1 Z12. Diodes have unidirectional conductivity and can be used for rectification and voltage stabilization in circuits. Here, a Zener diode is used for D1, stabilizing the voltage within the circuit and achieving better rectification. Capacitors (C1, C2, C3, C4, and C6) store charge, filter, and couple signals. For example, C1 and C4 may be used for power supply filtering to remove high-frequency interference, while C3 and C6 are used for signal coupling or filtering. Resistors (R1-R6) primarily limit current and divide voltage. Working in conjunction with other components, they determine the operating current and voltage within the circuit. Integrated circuit U1 is XKT-801. It integrates multiple electronic components and is the core of the circuit. When the first compensation structure and variable compensation are added, they can be controlled collaboratively to achieve dynamic variable compensation. The model of connector Q1 is XKT1151. The connector is used to connect external devices or circuit boards to facilitate circuit expansion and connection.

[0064] like Figure 3 FIG. 1 is a schematic diagram of the circuit structure of the receiving end of the present invention. The receiving end includes a second compensation structure and a rectifier filter circuit.

[0065] In a preferred embodiment, the second compensation structure includes: a sixth capacitor C 17 and the seventh capacitor C 18 The sixth capacitor C 17 The first end and the seventh capacitor C 18 The first end of the sixth capacitor C 17 The second end of the seventh capacitor C 18 The second end of the seventh capacitor C 18 The first end is connected to the external load R LThe first end of the seventh capacitor C 18 The second end is connected to the external load R L The second end of the

[0066] In a preferred embodiment, the rectifier and filter circuit includes: a second diode VD5, a third diode VD6, a fourth diode VD7, a fifth diode VD8 and an eighth capacitor (resonant capacitor); the anode of the second diode VD5 is connected to the first end of the eighth capacitor, the second end of the eighth capacitor is connected to the first end of the receiving coil, the cathode of the second diode VD5 is connected to the cathode of the fourth diode VD7, the anode of the second diode VD5 is connected to the cathode of the third diode VD6, the anode of the third diode VD6 is connected to the anode of the fifth diode VD8, the anode of the fifth diode VD8 is connected to the sixth capacitor C 17 The cathode of the fifth diode VD8 is connected to the anode of the fourth diode VD7, and the cathode of the fourth diode VD7 is connected to the sixth capacitor C 17 The first end of the receiving coil is connected, and the cathode of the fifth diode VD8 is connected to the second end of the receiving coil.

[0067] In a preferred embodiment, the eighth capacitor is a resonant capacitor.

[0068] In the above circuit, the resonant capacitor is used to form a resonant circuit with the secondary coil. By adjusting the capacitance value and other circuit parameters, the circuit can be made to resonate at a specific frequency, thereby improving energy transmission efficiency or achieving specific circuit functions. The diodes (VD5, VD6, VD7, and VD8) form a rectifier bridge structure. The unidirectional conductivity of the diodes is used to convert the AC signal output by the secondary coil into a DC signal, thereby providing a stable DC current to the load. The capacitor (C 17 and C 18 ) plays a filtering role, smoothing the rectified DC voltage, reducing voltage fluctuations, and making the output voltage more stable. External load (R L ) represents the electrical equipment in the circuit, which consumes the electrical energy after rectification and filtering.

[0069] It should be noted that the system embodiment described above is merely illustrative, wherein the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed across multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment. In addition, in the drawings of the system embodiment provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which can be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art can understand and implement the present invention without inventive work.

[0070] Those skilled in the art will clearly understand that for the sake of convenience and brevity, the specific working process of the device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0071] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A magnetically coupled resonant wireless power transmission system, characterized in that: include: Transmitter, magnetic coupling structure and receiver; The transmitting end includes: a rectifier circuit, a high-frequency inverter circuit and a first compensation structure; The magnetic coupling structure includes: a transmitting coil and a receiving coil; One end of the rectifier circuit is used to be connected to an external AC power supply, the other end of the rectifier circuit is connected to one end of the high-frequency inverter circuit, the other end of the high-frequency inverter circuit is connected to one end of the first compensation structure, and the other end of the first compensation structure is connected to the transmitting coil; the receiving coil is connected to one end of the receiving end, and the other end of the receiving end is connected to an external load; The rectifier circuit is used to obtain external AC current and convert the external AC current into DC current and transmit it to the high-frequency inverter circuit, so that the high-frequency inverter circuit converts the DC current into a high-frequency AC current with a stable output, and transmits the high-frequency AC current to the transmitting coil through the first compensation structure, so that the transmitting coil transmits the high-frequency AC current to the receiving end through electromagnetic coupling.

2. The magnetically coupled resonant wireless power transmission system according to claim 1, wherein: The receiving end includes: a second compensation structure and a rectification and filtering circuit; One end of the second compensation structure is connected to the receiving coil, and the other end of the second compensation structure is connected to one end of the rectifier and filter circuit; The other end of the rectifier and filter circuit is connected to an external load.

3. The magnetically coupled resonant wireless power transmission system according to claim 2, wherein: The rectifier circuit includes: a first capacitor, a second capacitor, a first resistor, a second resistor, a first diode and a transistor; A first end of the first capacitor is connected to an external AC power supply, and a second end of the first capacitor is grounded; The first end of the first resistor is connected to the first end of the first capacitor, the second end of the first resistor is connected to the first end of the second capacitor, and the second end of the second capacitor is grounded; The first end of the second resistor is connected to the first end of the first resistor, and the second end of the second resistor is connected to the collector of the transistor; The anode of the first diode is connected to the second end of the second capacitor, and the cathode of the first diode is connected to the base of the transistor and the second end of the first resistor respectively.

4. The magnetically coupled resonant wireless power transmission system according to claim 3, wherein: The high-frequency inverter circuit includes: a third capacitor, a fourth capacitor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and an integrated circuit; The emitter of the transistor is connected to the first end of the third capacitor, and the second end of the third capacitor is grounded; The first end of the third resistor is connected to the first end of the third capacitor, and the second end of the third resistor is connected to the first pin of the integrated circuit; A first end of the fourth capacitor is connected to the first pin of the integrated circuit, and a second end of the fourth capacitor is connected to the seventh pin of the integrated circuit; The first end of the sixth resistor is connected to the second end of the fourth capacitor, and the second end of the sixth resistor is connected to the first end of the third resistor and the eighth pin of the integrated circuit respectively; The first end of the fourth capacitor is connected to the second end of the third resistor, and the second end of the fourth resistor is connected to the second pin of the integrated circuit; A first end of the fifth resistor is connected to the fourth pin and the sixth pin of the integrated circuit respectively, and a second end of the fifth resistor is grounded; The fifth pin of the integrated circuit is grounded, and the third pin of the integrated circuit is connected to the seventh pin of the integrated circuit.

5. The magnetically coupled resonant wireless power transmission system according to claim 4, wherein: The first compensation structure includes: a fifth capacitor and a connector; The first end of the fifth capacitor is respectively connected to the second pin of the connector and the external AC power supply, and the second end of the fifth capacitor is respectively connected to the external AC power supply and the first end of the transmitting coil; The first pin of the connector is connected to the sixth pin of the integrated circuit, the third pin of the connector is grounded, and the third pin of the connector is connected to the second end of the transmitting coil.

6. The magnetically coupled resonant wireless power transmission system according to claim 5, wherein: The second compensation structure includes: a sixth capacitor and a seventh capacitor; The first end of the sixth capacitor is connected to the first end of the seventh capacitor, and the second end of the sixth capacitor is connected to the second end of the seventh capacitor; A first end of the seventh capacitor is connected to a first end of the external load, and a second end of the seventh capacitor is connected to a second end of the external load.

7. The magnetically coupled resonant wireless power transmission system according to claim 6, wherein: The rectification and filtering circuit includes: a second diode, a third diode, a fourth diode, a fifth diode and an eighth capacitor; The anode of the second diode is connected to the first end of the eighth capacitor, the second end of the eighth capacitor is connected to the first end of the receiving coil, the cathode of the second diode is connected to the cathode of the fourth diode, the anode of the second diode is connected to the cathode of the third diode, the anode of the third diode is connected to the anode of the fifth diode, the anode of the fifth diode is connected to the second end of the sixth capacitor, the cathode of the fifth diode is connected to the anode of the fourth diode, the cathode of the fourth diode is connected to the first end of the sixth capacitor, and the cathode of the fifth diode is connected to the second end of the receiving coil.

8. The magnetically coupled resonant wireless power transmission system according to claim 7, wherein: The eighth capacitor is a resonant capacitor.

9. The magnetically coupled resonant wireless power transmission system according to claim 8, wherein: The model of the integrated circuit is XKT-801.

10. The magnetically coupled resonant wireless power transmission system according to claim 9, wherein: The model of the connector is XKT1151.

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