An anti-interference wireless charging transmitting system

Abstract

The utility model discloses a kind of anti-interference wireless charging transmitting systems belonging to wireless power transmission technical field, including metal impedance substrate, transmitting coil, magnetic material layer, transmitting circuit, the metal impedance substrate is equipped with transmitting coil, transmitting coil is equipped with magnetic material layer between metal impedance substrate, transmitting coil is used to generate time-varying magnetic field, metal impedance substrate is electromagnetically coupled to generate reflected impedance by magnetic material layer and transmitting coil, the side of metal impedance substrate is equipped with transmitting circuit, transmitting circuit is electrically connected with transmitting coil, transmitting circuit includes preset complex impedance, for and reflected impedance mutual cancellation balance.The utility model generates reflected impedance by metal impedance substrate transmitting coil electromagnetically coupled, and utilize transmitting circuit to set up preset complex impedance and with reflected impedance mutual matching, suppress interference, construct stable transmitting environment, without variable assembly or real-time control circuit, realized the consistency of high degree and reliability.

Description

Technical Field

[0001] This utility model belongs to the field of wireless power transmission technology, and in particular relates to an anti-interference wireless charging transmission system. Background Technology

[0002] Wireless power transmitters, especially those operating on the principles of inductive coupling or magnetic resonance, are highly sensitive to their electromagnetic environment. A long-standing technical challenge is that when such transmitters are installed on or near conductive structures (such as metal tables or reinforced concrete floors), the presence of these materials significantly alters the complex impedance (equivalent inductance and equivalent resistance) of the transmitting coil due to eddy current induction. This impedance change can cause the transmitter's resonant circuit to detune, leading to a sharp decrease in energy transfer efficiency, increased heat generation, and potentially even system instability.

[0003] Existing technologies employ various strategies to address this issue, but each has its limitations. Both traditional passive shielding and complex real-time adaptive impedance matching systems suffer from high cost, complex design, and insufficient adaptability to static installation environments.

[0004] Therefore, the industry urgently needs a simple, low-cost, practical, and reliable solution. Utility Model Content

[0005] This utility model provides an anti-interference wireless charging transmitter system, which aims to solve the problems of existing wireless transmitters that suffer from resonance detuning due to eddy current induction effect, affecting energy transmission efficiency, high overall cost, complex design, and insufficient adaptability to static installation environments.

[0006] To achieve the above objectives, this utility model provides an anti-interference wireless charging transmission system, including a metal impedance substrate, a transmitting coil, a magnetic material layer, and a transmitting circuit. The transmitting coil is disposed on the metal impedance substrate, and a magnetic material layer is disposed between the transmitting coil and the metal impedance substrate. The transmitting coil is used to generate a time-varying magnetic field. The metal impedance substrate generates a reflected impedance through electromagnetic coupling with the transmitting coil via the magnetic material layer. A transmitting circuit is disposed on one side of the metal impedance substrate, and the transmitting circuit is electrically connected to the transmitting coil. The transmitting circuit includes a preset complex impedance for mutual cancellation and balance with the reflected impedance.

[0007] Preferably, the metal impedance substrate is a non-magnetic metal material with high electrical conductivity.

[0008] Preferably, the magnetic material layer is ferrite, and the magnetic material layer comprises one or more ferrite sheets combined.

[0009] Preferably, the reflective impedance generated by the metal impedance substrate is represented by the equivalent inductance and equivalent resistance values.

[0010] Preferably, the preset complex impedance is a resonant network impedance, the equivalent inductance and equivalent resistance of which are equal in magnitude and opposite in phase to the equivalent inductance and equivalent resistance of the reflection impedance, respectively.

[0011] The advantages of this utility model over the prior art are:

[0012] This invention provides an anti-interference wireless charging transmission system. It generates a reflected impedance through electromagnetic coupling of the transmitting coil on a metal impedance substrate, and uses a preset complex impedance in the transmitting circuit to match the reflected impedance, thereby suppressing interference and building a stable transmission environment. It achieves high consistency and reliability without the need for variable components or real-time control circuits.

[0013] To more clearly illustrate the structural features and effects of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0014] Figure 1 This is a side sectional view of the present invention.

[0015] Figure 2 This is a schematic diagram of the axial side structure of this utility model;

[0016] Figure 3 This is a schematic diagram of the shape of the metal impedance substrate in this utility model;

[0017] Figure 4 This is a schematic diagram of the second shape of the metal impedance substrate in this utility model; Explanation of reference numerals in the attached figures

[0018] 1. Metal impedance substrate; 2. Transmitting coil; 3. Magnetic material layer; 4. Transmitting circuit. Detailed Implementation

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0020] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0021] To achieve the above objectives, this utility model provides an anti-interference wireless charging transmission system, as shown in the reference. Figure 1-4 As shown, the device includes a metal impedance substrate 1, a transmitting coil 2, a magnetic material layer 3, and a transmitting circuit 4. The transmitting coil 2 is disposed on the metal impedance substrate 1, and the magnetic material layer 3 is disposed between the transmitting coil 2 and the metal impedance substrate 1. The transmitting coil 2 is used to generate a time-varying magnetic field. The metal impedance substrate 1 generates a reflected impedance through electromagnetic coupling with the transmitting coil 2 via the magnetic material layer 3. The transmitting circuit 4 is disposed on one side of the metal impedance substrate 1 and is electrically connected to the transmitting coil 2. The transmitting circuit 4 includes a preset complex impedance, which is used to cancel and balance the reflected impedance.

[0022] Furthermore, the metal impedance substrate 1 is a non-magnetic metal material with high conductivity, the magnetic material layer 3 is ferrite, and the magnetic material layer 3 includes one or more ferrite layers. The reflection impedance generated by the metal impedance substrate 1 is represented by the equivalent inductance value and the equivalent resistance value. The preset complex impedance is the resonant network impedance, and the equivalent inductance value and equivalent resistance value contained therein are equal in magnitude and opposite in phase to the equivalent inductance value and equivalent resistance value of the reflection impedance, respectively.

[0023] In this embodiment, the anti-interference function is achieved by correspondingly setting and arranging the metal impedance substrate 1, the transmitting coil 2, and the magnetic material layer 3. The overall structure is simple and does not require variable components or real-time control circuits, which greatly improves the stability and reliability of the system.

[0024] The metal impedance substrate 1 is made of a non-magnetic metal material with high conductivity, such as copper or aluminum. Its geometry can be flexibly set to any suitable shape, such as rectangle, hexagon, or circle, according to the industrial design requirements of the product. The thickness of the metal impedance substrate 1 and its relative position with the transmitting coil 2 can be adjusted according to the actual impedance requirements to form a stable electromagnetic coupling between the metal impedance substrate 1 and the transmitting coil 2. The magnetic material layer 3 is disposed between the transmitting coil 2 and the metal impedance substrate 1, preferably a ferrite material, and can be installed in the form of one or more layers. Its function is to enhance the electromagnetic coupling effect between the transmitting coil 2 and the metal impedance substrate 1. When the electromagnetic coupling effect is sufficient... It is strong enough that ferrite can be omitted, while providing a stable magnetic conduction path for the time-varying magnetic field of the transmitting coil 2; the transmitting coil 2 is electrically connected to the transmitting circuit 4, so that a time-varying magnetic field can be generated after being energized. The magnetic field passes through the magnetic material layer 3 and acts on the metal impedance substrate 1, providing the basic conditions for the generation of reflection impedance; the transmitting circuit 4 integrates the network parameters of the preset complex impedance. The network parameters are calibrated once during the design or manufacturing stage. For example, the impedance is adjusted by adjusting the capacitor to calibrate the network parameters, accurately matching the parameters of the preset complex impedance of the combination of the transmitting coil 2 and the metal impedance substrate 1, thereby achieving mutual cancellation balance between the preset complex impedance and the reflection impedance.

[0025] In one embodiment, the geometry, thickness, and mounting distance between the metal impedance substrate 1 and the transmitting coil 2 are first determined according to design requirements. Then, the magnetic material layer 3 of ferrite material is fixed between the two to complete the electrical connection between the transmitting coil 2 and the transmitting circuit 4. After that, the network parameters of the transmitting circuit 4 are calibrated once, and its resonant circuit or impedance matching network parameters are adjusted to ensure that the system reaches the optimal working state at the preset working frequency. After calibration, it can be directly installed and used without additional debugging or real-time control. No matter how the installation environment changes, it can maintain stable energy transmission efficiency and working performance.

[0026] The calibration process is a static, one-time calibration performed during the production phase:

[0027] Measurement: At a defined operating frequency (e.g., 6.78MHz, commonly used for wireless charging), a professional instrument such as an impedance analyzer is used to accurately measure the actual reflected impedance value generated by the combination of the transmitting coil 2, ferrite, and metal impedance substrate 1.

[0028] Calculation and selection: Based on the measured values, calculate the precise values ​​of the capacitance and inductance required in the matching network;

[0029] Confirm the parameter range. The parameters of the preset complex impedance (i.e., the capacitance value of the capacitor and the inductance value of the matching network) do not have a universal fixed range. These parameter values ​​depend entirely on the physical structure of each specific design (such as the number of coil turns, the thickness of the metal plate material, the spacing, etc.) and the selected operating frequency, so they are highly customized.

[0030] Working principle: When the transmitting coil 2 is energized, it generates a time-varying magnetic field. The magnetic field passes through the magnetic material layer 3 and induces eddy currents inside the metal impedance substrate 1. The secondary magnetic field generated by the eddy current couples a dominant and stable reflective impedance to the transmitting coil 2. Here, the reflective impedance can be represented by the equivalent inductance and equivalent resistance values. Since the network parameters of the transmitting circuit 4 have been pre-calibrated, the preset complex impedance can cancel out and balance the reflective impedance, so that the total impedance of the transmitting system remains stable. At this time, the influence of the eddy current induction effect caused by the external installation environment (such as a metal table or reinforced concrete floor) on the system impedance is negligible compared with the internal stable reflective impedance, thereby avoiding detuning of the resonant circuit.

[0031] This invention provides an anti-interference wireless charging transmission system. It generates a reflected impedance through electromagnetic coupling of the transmitting coil 2 on the metal impedance substrate 1, and uses the transmitting circuit 4 to set a preset complex impedance that matches the reflected impedance to suppress interference and build a stable transmission environment. It has high reliability without the need for variable components or real-time control circuits.

[0032] The technical principles of this utility model have been described above with reference to specific embodiments, which are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments; all technical solutions falling within the scope of this utility model's concept are protected. Those skilled in the art can conceive of other specific embodiments of this utility model without creative effort, and these embodiments will all fall within the protection scope of this utility model.

Claims

1. An anti-interference wireless charging transmission system, characterized in that, The device includes a metal impedance substrate, a transmitting coil, a magnetic material layer, and a transmitting circuit. The transmitting coil is disposed on the metal impedance substrate, and a magnetic material layer is disposed between the transmitting coil and the metal impedance substrate. The transmitting coil is used to generate a time-varying magnetic field. The metal impedance substrate generates a reflected impedance through electromagnetic coupling with the transmitting coil via the magnetic material layer. A transmitting circuit is disposed on one side of the metal impedance substrate. The transmitting circuit is electrically connected to the transmitting coil. The transmitting circuit includes a preset complex impedance, which is used to cancel and balance the reflected impedance.

2. The anti-interference wireless charging transmission system according to claim 1, characterized in that, The metal impedance substrate is a non-magnetic metal material with high electrical conductivity.

3. The anti-interference wireless charging transmission system according to claim 1, characterized in that, The magnetic material layer is ferrite, and the magnetic material layer includes one or more ferrite sheets combined.

4. The anti-interference wireless charging transmission system according to claim 1, characterized in that, The reflected impedance generated by the metal impedance substrate is represented by the equivalent inductance and equivalent resistance values.

5. The anti-interference wireless charging transmission system according to claim 4, characterized in that, The preset complex impedance is the resonant network impedance, and its equivalent inductance and equivalent resistance values ​​are equal in magnitude and opposite in phase to the equivalent inductance and equivalent resistance values ​​of the reflection impedance, respectively.

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