Array type UWPT system

Abstract

The invention discloses an array-type UWPT system, and the system comprises an energy inversion module which comprises a DC power supply and a full-bridge inversion circuit, and the DC power supply is connected with the input end of the full-bridge inversion circuit through a wire, and provides energy for the inversion process of the system; the resonance compensation network comprises a transmitting / receiving side compensation capacitor, and the transmitting / receiving side compensation capacitor comprises a transmitting side compensation capacitor Ctx and a transmitting side compensation capacitor Crx; the reconfigurable coupling mechanism comprises n transmitting coil groups Ltx and m receiving coil groups Lrx; the energy receiving module comprises a bridge rectifier circuit and a load RL; the direct-current power supply is connected with the full-bridge inverter circuit in series, the full-bridge inverter circuit is connected with the transmitting / receiving side compensation capacitor, and the transmitting side compensation capacitor Ctx and the transmitting coil assembly Ltx are connected in series and then connected to the output end of the full-bridge inverter circuit to form an LC series resonance circuit. The n transmitting coil groups and the m receiving coil groups perform energy transmission through electromagnetic coupling, and the receiving coil groups generate high-frequency alternating current after sensing magnetic field changes of the transmitting coils and are connected to the input end of the bridge rectifier circuit through wires.

Description

Technical Field

[0001] This invention relates to the field of array-type magnetic coupling mechanism technology, and more particularly to an array-type UWPT system. Background Technology

[0002] In different application scenarios, the transmitting and receiving ends of the power transmission mechanism will inevitably be offset, causing the coupling coefficient to decay exponentially, which in turn causes problems such as system detuning and a sharp drop in efficiency, severely restricting the engineering application of wireless power transmission technology.

[0003] Currently, anti-migration technology focuses on three paths. Dynamic compensation network reconstruction: integrating multiple compensation topology characteristics to expand the anti-migration range, but parameter matching and control strategies still need to be optimized to suppress reactive power loss; Control strategy optimization: using duty cycle modulation, frequency tracking, and phase-shifting modulation to improve anti-migration performance, but limited by the narrow anti-migration range bottleneck; Magnetic coupling mechanism optimization: improving anti-migration capability through the design of uniform magnetic field distribution, which is recognized as the core technology path.

[0004] Compared to traditional single-coil structures, array-type magnetic coupling mechanisms optimize the magnetic field distribution through multi-coil excitation and coordinated control, effectively extending their offset resistance range and demonstrating significant potential in the field of wireless power transmission. Their excitation modes mainly include: 1. Current amplitude and phase modulation adaptively based on the receiver position; 2. Single-coil activation with the largest coupling coefficient; 3. Preset fixed activation mode; 4. Multi-coil activation with efficiency or power closed-loop control; 5. Full activation mode. Modes 1 and 5 have limited offset resistance ranges due to the poor extensibility of the transmitting array.

[0005] In the research field of offset resistance performance of array-type magnetic coupling mechanisms, existing strategies suffer from multiple fundamental constraints, including structural complexity, offset robustness, and high efficiency. Specifically, single-layer transmitter arrays are limited by layout constraints, resulting in generally insufficient energy transfer efficiency; three-layer transmitter arrays offer excellent energy transfer efficiency, but increase design complexity and cost; and two-layer transmitter arrays offer balanced overall performance. Summary of the Invention

[0006] To address the problems existing in the prior art, this invention discloses an array-type UWPT system, comprising:

[0007] The energy inverter module includes a DC power supply and a full-bridge inverter circuit. The DC power supply is connected to the input terminal of the full-bridge inverter circuit through wires to provide energy for the inverter process of the system.

[0008] The resonant compensation network includes transmit / receive side compensation capacitors, wherein the transmit / receive side compensation capacitors include a transmit side compensation capacitor C. tx and the transmitting side compensation capacitor C rx ;

[0009] The reconfigurable coupling mechanism includes n transmitting coil groups L tx and m receiving coil groups L rx ;

[0010] The energy receiving module includes a bridge rectifier circuit and a load RL;

[0011] The DC power supply and the full-bridge inverter circuit are connected in series. The full-bridge inverter circuit is connected to the transmitter / receiver side compensation capacitor, wherein the transmitter side compensation capacitor C... tx With transmitting coil group L tx After being connected in series, they are connected to the output of the full-bridge inverter circuit to form an LC series resonant circuit. The n transmitting coil groups and the m receiving coil groups transmit energy through electromagnetic coupling. After the receiving coil group senses the change in the magnetic field of the transmitting coil, it generates high-frequency AC, which is connected to the input of the bridge rectifier circuit through wires.

[0012] Furthermore, the n transmitting coil groups L tx The dual-layer transmitting array is arranged with alternating layers, and the m receiving coil groups L rx It features a dual-coil structure with axial overlap. This expands the magnetic field coverage area, enabling "area-like" energy transfer and supporting simultaneous charging of multiple devices. It also reduces mutual inductance interference between coils by optimizing the magnetic field distribution through staggered arrangement.

[0013] Furthermore, the receiving coil L i With the transmitting coil L j The coupling coefficient is k ij Adjusting the operating state of the transmitting coil group, including activating different layers of coils and changing the coil current phase, to adapt to changes in the position of the receiving equipment and dynamically optimize the coupling coefficient k. ij .

[0014] Furthermore, the bridge rectifier circuit structure includes a bridge structure composed of four diodes, which converts AC power into pulsating DC power, which is then smoothed by a filter capacitor before supplying power to the load.

[0015] By employing the above-mentioned technical solutions, this invention provides an array-type UWPT system. This system overcomes the dependence of traditional single-coil modes on high-precision positioning and fixed docking, offering an effective magnetic coupling mechanism solution for underwater wireless power transmission systems that combines flexible docking, high energy efficiency, and strong dynamic offset tolerance. The system adopts a single-input single-output (SISO) transmission mode, dynamically selecting the optimal transmit-receive coil combination for activation through a switching matrix, avoiding cross-coupling effects in multi-excitation modes, thereby further improving the coupling coefficient and increasing system efficiency. At the transmitting end, a double-layer staggered transmit coil architecture is adopted, and the coupling compensation mechanism improves the coverage of the high-coupling area of ​​the system, significantly enhancing the robustness of energy transmission. The receiving array is designed with an overlapping dual-coil arrangement, utilizing the complementary effect of spatial magnetic fields to expand the high-coupling area and improve coupling stability under dynamic offset conditions. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a structural block diagram of an array-type UWPT system according to the present invention.

[0018] Figure 2 This is a schematic diagram of the double-layer array structure of the transmitting coil group in this invention.

[0019] Figure 3 This is a schematic diagram of the configuration of the receiving coil group in this invention. Detailed Implementation

[0020] To make the technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention:

[0021] like Figure 1 The illustrated array-type UWPT system includes an energy inverter module comprising a DC power supply and a full-bridge inverter circuit. The DC power supply is directly connected to the input terminal of the full-bridge inverter circuit via wires to provide energy for the system's inverter process. The system also includes a resonant compensation network, a reconfigurable coupling mechanism, and an energy receiving module. The resonant compensation network includes transmit / receive side compensation capacitors, and the transmit / receive side compensation capacitors include a transmit-side compensation capacitor C. tx and the transmitting side compensation capacitor C rx The reconfigurable coupling mechanism includes n transmitting coil groups L txand m receiving coil groups L rx The energy receiving module includes a bridge rectifier circuit and a load RL. The DC power supply is connected in series with the full-bridge inverter circuit, which is connected to the transmitter / receiver side compensation capacitor, wherein the transmitter side compensation capacitor C... tx With transmitting coil group L tx After being connected in series, they are connected to the output of the full-bridge inverter circuit to form an LC series resonant circuit. The n transmitting coil groups and the m receiving coil groups transmit energy through electromagnetic coupling. After the receiving coil group senses the change in the magnetic field of the transmitting coil, it generates high-frequency AC, which is connected to the input of the bridge rectifier circuit through wires.

[0022] like Figure 2 As shown, the transmitting coil array features a double-layered, staggered arrangement of coils in the upper and lower layers, forming a grid-like magnetic field coverage. The interlayer spacing is typically 1 / 5 to 1 / 3 of the coil diameter to prevent magnetic field cancellation. Each transmitting coil group can be independently switched on / off or its current phase adjusted, dynamically activating coils in the corresponding area based on the location of the receiving device to optimize the coupling coefficient.

[0023] like Figure 3 As shown, the receiving coil group is arranged with two coils overlapping axially. The two coils are stacked along the vertical direction (axial direction) with their central axes coinciding. The spacing between the coils is usually smaller than the coil radius. The double-coil structure is equivalent to increasing the receiving area, and the axial overlap causes the magnetic field induction intensity to be superimposed. Even if the receiving device is offset in the vertical direction, it can still maintain a high coupling coefficient.

[0024] Example

[0025] The array-type UWPT system disclosed in this invention includes an energy inverter module, a resonant compensation network, a reconfigurable coupling mechanism, and an energy receiving module. The reconfigurable coupling mechanism comprises n transmitting coil groups (switched by switches S1-Sn, with an equivalent series resistance of Rtx) and m receiving coil groups (switched by switches K1-Km, with an equivalent series resistance of Rrx), and its coupling coefficient matrix is ​​represented as k = [kij]n×m;

[0026] This system employs a single-input single-output (SISO) transmission mode, dynamically selecting the optimal transmitter-receiver coil pair for activation via a switching matrix. Based on relevant formulas, its energy transfer efficiency is:

[0027]

[0028] Where k is the coupling coefficient, ω is the angular frequency, Ltx and Lrx are the self-inductances of the transmitting / receiving coils, RL is the load, and R'L is the equivalent resistance of the rectifier circuit and the load.

[0029] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An array-type UWPT system, characterized in that... include: The energy inverter module includes a DC power supply and a full-bridge inverter circuit. The DC power supply is connected to the input terminal of the full-bridge inverter circuit through wires to provide energy for the inverter process of the system. The resonant compensation network includes transmit / receive side compensation capacitors, wherein the transmit / receive side compensation capacitors include a transmit side compensation capacitor C. tx and the transmitting side compensation capacitor C rx ; The reconfigurable coupling mechanism includes n transmitting coil groups L tx and m receiving coil groups L rx ; The energy receiving module includes a bridge rectifier circuit and a load RL; The DC power supply and the full-bridge inverter circuit are connected in series. The full-bridge inverter circuit is connected to the transmitter / receiver side compensation capacitor, wherein the transmitter side compensation capacitor C... tx With transmitting coil group L tx After being connected in series, they are connected to the output of the full-bridge inverter circuit to form an LC series resonant circuit. The n transmitting coil groups and the m receiving coil groups transmit energy through electromagnetic coupling. After the receiving coil group senses the change in the magnetic field of the transmitting coil, it generates high-frequency AC, which is connected to the input of the bridge rectifier circuit through wires.

2. The array-type UWPT system according to claim 1, characterized in that: The n transmitting coil groups L tx The dual-layer transmitting array is arranged with alternating layers, and the m receiving coil groups L rx It has a double coil structure and is arranged in an axially overlapping manner.

3. The array-type UWPT system according to claim 1, characterized in that: The receiving coil L i With the transmitting coil L j The coupling coefficient is k ij Adjusting the operating state of the transmitting coil group, including activating different layers of coils and changing the coil current phase, to adapt to changes in the position of the receiving equipment and dynamically optimize the coupling coefficient k. ij .

4. The array-type UWPT system according to claim 1, characterized in that: The bridge rectifier circuit structure includes a bridge structure composed of four diodes, which converts AC power into pulsating DC power, and then smooths it through a filter capacitor before supplying power to the load.

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