A multi-load constant voltage power supply method and device for a relay type wireless energy transmission system

Abstract

This invention discloses a method and apparatus for multi-load constant voltage power supply in a relay-type wireless power transfer system. The method includes: establishing a circuit equivalent model of the relay-type wireless power transfer system; using the condition that the loop currents of n energy transmission coils decrease by 90° at each stage, classifying the cross-coupling effects according to the current phase relationship, and canceling the cross-coupling effects at the circuit level; deriving the loop voltages and loop currents of the n energy transmission coils, determining the current phase distribution, current expression, and voltage expression of the constant current stage coil and the constant voltage stage coil; based on the current phase distribution, determining the coil loop phase configuration conditions for multi-load constant voltage output and forming a coil arrangement scheme; deriving the multi-load output voltage expression of the relay-type wireless power transfer system based on the current expression of the constant current stage coil, and optimizing the corresponding coil arrangement scheme based on the constant voltage power supply requirements of the zero-value monitoring sensor.

Description

Technical Field

[0001] This invention relates to the field of online monitoring and power supply technology for zero-value insulators, and more specifically, to a multi-load constant voltage power supply method and device for a relay-type wireless power transmission system. Background Technology

[0002] To ensure the safe operation of the power grid, a large number of intelligent online monitoring devices have been put into operation, enabling comprehensive monitoring of the power grid by collecting data from outdoor transmission lines. However, traditional methods such as solar power and battery power cannot meet the continuous and reliable power supply requirements of these online monitoring devices. Wireless power transmission based on near-field electromagnetic coupling is a safe, flexible, and reliable emerging power supply technology that can adapt to various harsh weather conditions such as rain, fog, and humidity, providing a feasible way to power online monitoring equipment for outdoor transmission lines. In recent years, some scholars have combined wireless power transmission technology with CT power extraction technology to extract power from high-voltage lines and wirelessly transmit it to towers to power low-voltage online monitoring equipment. Since the distance from the transmission line to the tower increases with the voltage level, the relay-type magnetic coupling wireless power transmission technology adds a relay-side structural unit between the energy transmitting and receiving structural units, utilizing the magnetic coupling resonance of the relay coil to achieve energy transmission over medium and long distances, solving the problem of limited transmission distance caused by near-field coupling. Currently, relay coils are mounted on insulator strings for on-site installation and deployment. The last stage coil provides constant voltage output to power the load terminal. However, for applications such as zero-value detection of insulator strings, multiple zero-value monitoring sensors need to be distributed on the insulator strings. The power supply for these sensors urgently needs to solve the problem of constant voltage output for multiple loads in relay wireless power transmission systems under complex cross-coupling. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a multi-load constant voltage power supply method and device for a relay-type wireless power transmission system.

[0004] According to one aspect of the present invention, a multi-load constant voltage power supply method for a relay wireless power transmission system is provided, comprising: Establish a circuit equivalent model for a relay-type wireless power transmission system. The circuit equivalent model includes one transmitting coil, n-1 relay coils (a total of n power transmission coils), and s receiving coils. With the premise that the loop current of n energy transmission coils decreases by 90° step by step, the cross-coupling effect between non-adjacent energy transmission coils is analyzed, and the cross-coupling effect is classified according to the current phase relationship to cancel the cross-coupling effect at the circuit level. Under the condition of eliminating coil cross-coupling, the loop voltage and loop current of n energy transmission coils are derived, and the current phase distribution, current expression and voltage expression of the constant current stage coil and the constant voltage stage coil are determined. Based on the current phase distribution, the phase configuration conditions of the coil circuit for multi-load constant voltage output are determined, and the coil arrangement scheme of the transmitting coil node, relay coil node, and receiving coil node is formed. Based on the current expression of the constant current stage coil, the multi-load output voltage expression of the repeater wireless power transmission system is derived. Based on the constant voltage power supply requirements of the zero-value monitoring sensor, the corresponding coil layout scheme is optimized.

[0005] Optionally, the cross-coupling effects between non-adjacent energy transfer coils are analyzed, and the cross-coupling effects are categorized according to the current phase relationship, including: Taking the loop current of the current k-th stage energy transfer coil as the 0 reference phase, the cross-coupling effects between non-adjacent energy transfer coils are categorized by coil current phase, including: Type 1: If the current phase of the non-adjacent g-th stage energy transmission coil is -90° or 90°, it is classified as a self-eliminating cross-coupling. The second type: If the current phase of the non-adjacent g-th stage energy transmission coil is 0° or 180°, it is classified as a compensated elimination type of cross coupling.

[0006] Optionally, the elimination principle of self-eliminating cross-coupling is as follows: The non-adjacent g-th stage energy transmission coil generates a first induced voltage in the circuit of the k-th stage energy transmission coil, and the adjacent (k-1)-th and (k+1)-th stage energy transmission coils generate a second induced voltage in the circuit of the k-th stage energy transmission coil. When the first induced voltage and the second induced voltage are in opposite phase, the first induced voltage is canceled out. The principle of compensation-based cross-coupling elimination is as follows: The self-induced voltage and capacitor voltage of the k-th stage energy transfer coil circuit are used to compensate for the cross-coupling effects caused by non-adjacent g-th stage energy transfer coils with current phases of 0° or 180°, where the k-th stage energy transfer coil circuit is the self-induced voltage and capacitor voltage. k The self-inductance, capacitance, and compensated cross-coupling of the stage coil circuit satisfy the following conditions: In the formula, U Lk Representing the k The self-induced voltage of the stage coil circuit, U Ck Representing the k The voltage of the compensation capacitor in the stage coil circuit. U kg Representing the g The first stage coil k The induced voltage of the coil.

[0007] Optionally, under the condition of eliminating coil cross-coupling, the loop current of each stage of the energy transfer coil decreases by 90° step by step, and the resulting current phase distribution is expressed as: in, U inv This is the input voltage of the transmitting coil circuit. I i Indicates the first i The current in the stage coil, M i(i+1) R represents the mutual inductance between adjacent coils. eqi Indicates the first i The equivalent impedance of the coil, where ω is the system angular frequency; The current expression for the constant current stage coil circuit and the output voltage expression for the constant voltage stage coil circuit are as follows: The constant voltage stage coil current phase is 0° / -180°, and the constant current stage coil current phase is -90° / 90°. U inv This represents the output voltage of the inverter. M (2i+1)(2i) This represents the mutual inductance between the (2i+1)th stage coil and the 2ith stage coil. M (2i-1)(2i) This represents the mutual inductance between the 2i-1 level coil and the 2i level coil. I k_even Representing the k The current in the constant current stage coil, U k_odd Representing the k The voltage of the constant voltage stage coil.

[0008] Optionally, the constant current stage coil is an energy transmission coil with a current phase of -90° or 90°, and the constant voltage stage coil is an energy transmission coil with a current phase of 0° or -180°.

[0009] Alternatively, the coil arrangement can be as follows: The transmitting coil node is used to achieve energy injection; Relay coil nodes are used to achieve relay transmission of energy; The receiving coil node corresponds to the load terminal to provide power to the load. All receiving coils couple energy only from constant current stage coils, and each receiving coil is a constant voltage stage coil to achieve one-way multi-load constant voltage output; The constant current stage coil serves as the energy flow branch node between the receiving coil and the next stage relay coil; The next stage relay coil after the constant current stage coil is the constant voltage stage coil. The sum of the voltages across all impedances in the circuit of the constant voltage stage coil is constant.

[0010] Optionally, the arrangement scheme and corresponding phase configuration conditions of the transmitting coil and each relay coil of the multi-load constant voltage output are as follows: Transmitting coil (0°) → Relay coil (-90°) → Relay coil (-180°) → Relay coil (90°) → Relay coil (0°) → ……; Furthermore, receiving coils with current phases of -180° or 0° are configured to couple energy from corresponding constant current stage coils with current phases of -90° or 90°, respectively, to form load terminal output.

[0011] Optionally, the multi-load output voltage expression is: In the formula, M k_oj For the first k The constant current stage relay coil and the first stage j indivual( j =1,2,…, s The mutual inductance between the receiving coils U oj For the first j indivual( j =1,2,…, s The output voltage of the load, ω is the system angular frequency. I k_even Representing the k The current in the constant current stage coil, U inv This represents the output voltage of the inverter. M (2i+1)(2i) This represents the mutual inductance between the (2i+1)th stage coil and the 2ith stage coil. M (2i-1)(2i) This represents the mutual inductance between the 2i-1 level coil and the 2i level coil.

[0012] Optionally, based on the constant voltage power supply requirements of the zero-value monitoring sensor, the corresponding coil arrangement scheme is optimized, including: By adjusting the mutual inductance between the energy transmission coil and the receiving coil, the constant voltage power supply requirement of the zero-value monitoring sensor is met. The optimization design sequence is as follows: using the number of turns and radius of each level of coil as optimization variables, and following the hierarchical optimization sequence of first optimizing the energy transmission coil and then optimizing the receiving coil, design the corresponding transmitting coil, relay coil and receiving coil.

[0013] According to another aspect of the present invention, a multi-load constant voltage power supply device for a relay wireless power transmission system is provided, comprising: A module is established to build the circuit equivalent model of the relay wireless power transmission system. The circuit equivalent model includes one transmitting coil, n-1 relay coils (a total of n power transmission coils), and s receiving coils. The elimination module is used to analyze the cross-coupling effect between non-adjacent energy transmission coils, with the loop current of n energy transmission coils decreasing by 90° step by step as a prerequisite. It also classifies the cross-coupling effect according to the current phase relationship and cancels the cross-coupling effect at the circuit level. The determination module is used to derive the loop voltage and loop current of n energy transmission coils under the condition of eliminating coil cross-coupling, and to determine the current phase distribution, current expression and voltage expression of the constant current stage coil and the constant voltage stage coil. The module is used to determine the phase configuration conditions of the coil circuit for multi-load constant voltage output based on the current phase distribution, and to form the coil arrangement scheme of the transmitting coil node, relay coil node, and receiving coil node. The optimization module is used to derive the multi-load output voltage expression of the relay wireless power transmission system based on the current expression of the constant current stage coil, and optimize the design of the corresponding coil layout scheme based on the constant voltage power supply requirements of the zero-value monitoring sensor.

[0014] According to another aspect of the present invention, a computer-readable storage medium is provided, the storage medium storing a computer program for performing the methods described in any of the above aspects of the present invention.

[0015] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising: a processor; a memory for storing executable instructions of the processor; the processor being configured to read the executable instructions from the memory and execute the instructions to implement the method described in any of the preceding aspects of the present invention.

[0016] Therefore, this invention proposes a multi-load constant voltage power supply method for a relay-type wireless power transmission system for online monitoring of zero-value insulators. First, an equivalent circuit model of the relay-type wireless power transmission system is established. Under the premise that the current in the relay coil loops differs by 90° at each stage, the cross-coupling effect between non-adjacent coils is analyzed, and a method to eliminate cross-coupling between non-adjacent coils is given. The coils are arranged according to the transmitting coil node, relay coil node, and terminal coil node, and the relationship between the current phase of each coil node and the multi-load constant voltage output is analyzed to determine the coil loop phase configuration conditions for multi-load constant voltage output. The multi-load output voltage expression of the relay-type magnetically coupled wireless power supply system is derived. Based on the constant voltage power supply requirements of the zero-value monitoring sensor, the mutual inductance value between coils is deduced, and the corresponding transmitting coil, relay coil, and terminal coil are designed to realize the multi-load constant voltage output of the relay-type wireless power transmission system with multiple loads in one channel. This invention achieves multi-load constant voltage output by adding terminal coils to each constant current stage relay coil node, overcoming the drawback of the current relay-type wireless power transmission system that only provides one constant voltage output, and providing a solution for power supply scenarios for online monitoring of zero-value insulators. Attached Figure Description

[0017] Exemplary embodiments of the present invention can be more fully understood by referring to the following figures: Figure 1 This is a flowchart illustrating a multi-load constant voltage power supply method for a relay wireless power transmission system provided in an exemplary embodiment of the present invention. Figure 2 This is a circuit topology diagram of a relay wireless power transmission system with 3 load outputs provided in an exemplary embodiment of the present invention; Figure 3 This is an exemplary embodiment of the present invention. Figure 2 The equivalent circuit diagram; Figure 4a , Figure 4b This is an exemplary embodiment of the present invention, which uses the current of the current in the current k-th stage coil circuit as the reference phase of 0, and the current phase of the non-adjacent k±(1+2a)-th stage coil is... At this time, the cross-coupling between the coils is reduced to a self-eliminating cross-coupling schematic diagram; Figure 5a , Figure 5b This is an exemplary embodiment of the present invention, which uses the current of the current in the current k-th stage coil circuit as the reference phase of 0, and the current phase of the non-adjacent k±2a-th stage coil is... At this time, the cross-coupling between the coils is reduced to a compensated elimination type cross-coupling diagram.

[0018] Figure 6 This is a schematic diagram of an experimental prototype provided in an exemplary embodiment of the present invention; Figures 7a-7dThe inverter output voltage provided by an exemplary embodiment of the present invention ( U inv ), current in each stage of the coil ( I 1. I 2. I 3. I 4) and the current of the receiving coil ( I p1 , I p2 , I p3 The experimental waveform diagram; Figures 8a-8c This is an experimental waveform diagram of the output voltage of three DC loads (RL1, RL2, RL3) being changed sequentially according to an exemplary embodiment of the present invention. Figure 9 This is a schematic diagram of the structure of a multi-load constant voltage power supply device for a relay wireless power transmission system provided in an exemplary embodiment of the present invention. Figure 10 This is the structure of an electronic device provided in an exemplary embodiment of the present invention. Detailed Implementation

[0019] Hereinafter, exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments of the present invention. It should be understood that the present invention is not limited to the exemplary embodiments described herein.

[0020] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention.

[0021] Those skilled in the art will understand that the terms "first," "second," etc., in the embodiments of the present invention are only used to distinguish different steps, devices, or modules, and do not represent any specific technical meaning, nor do they indicate a necessary logical order between them.

[0022] It should also be understood that in the embodiments of the present invention, "multiple" can refer to two or more, and "at least one" can refer to one, two or more.

[0023] It should also be understood that any component, data or structure mentioned in the embodiments of the present invention can generally be understood as one or more unless explicitly defined or given contrary instructions in the context.

[0024] Furthermore, the term "and / or" in this invention is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this invention generally indicates that the preceding and following related objects have an "or" relationship.

[0025] It should also be understood that the description of the various embodiments in this invention emphasizes the differences between the various embodiments, and the similarities or similarities can be referred to each other. For the sake of brevity, they will not be described in detail.

[0026] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0027] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0028] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0030] The embodiments of this invention can be applied to electronic devices such as terminal devices, computer systems, and servers, and can operate together with a wide range of other general-purpose or special-purpose computing system environments or configurations. Well-known examples of terminal devices, computing systems, environments, and / or configurations suitable for use with electronic devices such as terminal devices, computer systems, and servers include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, handheld or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network PCs, minicomputer systems, mainframe computer systems, and distributed cloud computing environments including any of the above systems, etc.

[0031] Electronic devices such as terminal devices, computer systems, and servers can be described in the general context of computer system executable instructions (such as program modules) executed by a computer system. Typically, program modules can include routines, programs, object programs, components, logic, data structures, etc., which perform specific tasks or implement specific abstract data types. Computer systems / servers can be implemented in distributed cloud computing environments, where tasks are executed by remote processing devices linked through communication networks. In distributed cloud computing environments, program modules can reside on local or remote computing system storage media, including storage devices.

[0032] Exemplary methods Figure 1 This is a schematic flowchart illustrating a multi-load constant voltage power supply method for a relay-type wireless power transfer system provided in an exemplary embodiment of the present invention. This embodiment can be applied to electronic devices, such as... Figure 1 As shown, the multi-load constant voltage power supply method 100 for a relay wireless power transmission system includes the following steps: Step 101: Establish the circuit equivalent model of the relay wireless power transmission system. The circuit equivalent model includes one transmitting coil, n-1 relay coils (a total of n power transmission coils), and s receiving coils. Step 102: Taking the condition that the loop current of the n energy transmission coils decreases by 90° step by step as a prerequisite, analyze the cross-coupling effect between non-adjacent energy transmission coils, and classify the cross-coupling effect according to the current phase relationship to cancel the cross-coupling effect at the circuit level. Step 103: Under the condition of eliminating coil cross-coupling, derive the loop voltage and loop current of n energy transmission coils, and determine the current phase distribution, current expression and voltage expression of the constant current stage coil and the constant voltage stage coil. Step 104: Based on the current phase distribution, determine the phase configuration conditions of the coil circuit for multi-load constant voltage output, and form a coil arrangement scheme for the transmitting coil node, relay coil node, and receiving coil node. Step 105: Based on the current expression of the constant current stage coil, derive the multi-load output voltage expression of the relay wireless power transmission system, and optimize the design of the corresponding coil layout scheme based on the constant voltage power supply requirements of the zero-value monitoring sensor.

[0033] Specifically, this invention proposes a multi-load constant voltage power supply method for a relay-type wireless power transmission system for online monitoring of zero-value insulators. First, an equivalent circuit model of the relay-type wireless power transmission system is established. Under the premise that the current in the relay coil loops differs by 90° at each stage, the cross-coupling effect between non-adjacent coils is analyzed, and a method to eliminate cross-coupling between non-adjacent coils is given. The coils are arranged according to the transmitting coil node, relay coil node, and terminal coil node, and the relationship between the current phase of each coil node and the multi-load constant voltage output is analyzed to determine the coil loop phase configuration conditions for multi-load constant voltage output. The multi-load output voltage expression of the relay-type magnetically coupled wireless power supply system is derived. Based on the constant voltage power supply requirements of the zero-value monitoring sensor, the mutual inductance value between coils is deduced, and the corresponding transmitting coil, relay coil, and terminal coil are designed to realize the multi-load constant voltage output of the relay-type wireless power transmission system with multiple loads in one channel. This invention achieves multi-load constant voltage output by adding terminal coils to each constant current stage relay coil node, overcoming the drawback of the current relay-type wireless power transmission system that only provides one constant voltage output, and providing a solution for power supply scenarios for online monitoring of zero-value insulators.

[0034] This invention provides a multi-load constant voltage power supply method for a relay wireless power transmission system for online monitoring of zero-value insulators, comprising the following steps: S1. Establish a circuit equivalent model of the relay wireless power transmission system. This circuit equivalent model includes one transmitter, ... n-1 One relay n One energy transmission coil and s One receiving coil; S2, with n The premise is that the current in each energy transmission coil loop decreases by 90° step by step. The cross-coupling effect between non-adjacent coils is analyzed. The cross-coupling effect of the coils is classified according to the current phase relationship, and the cross-coupling effect of the coils is canceled at the circuit level. S3. Derivation under the condition of no coil cross-coupling n The current phase distribution of the constant current stage coil and the constant voltage stage coil is determined by the loop voltage and loop current of the energy transmission coil. S4. Based on step S3, further analyze the relationship between the current phase of the constant current stage and the constant voltage stage coil node and the multi-load constant voltage output, determine the coil circuit phase configuration conditions for the multi-load constant voltage output, and form the coil arrangement scheme of the transmitting coil node, the relay coil node, and the receiving coil (corresponding to the load terminal) node. S5. Based on the constant current stage coil current expression, the multi-load output voltage expression of the relay wireless power transmission system is derived. Based on the constant voltage power supply requirements of the zero-value monitoring sensor, the corresponding transmitting coil, relay coil and receiving coil are optimized.

[0035] Further, in step S2, with the current number...k The current in the primary coil circuit is at zero reference phase. The cross-coupling effects between non-adjacent coils are categorized based on the coil current phase: Category 1: If not adjacent g The phase of the coil current is This boils down to self-eliminating cross-coupling; the self-elimination principle is: Non-adjacent g The first stage coil k The induced voltage in the stage coil circuit is: in, I g Indicates the first g The current in the stage coil, M kg Indicates the first g The first coil and the second k Cross-inductance between coils θ g Indicates the first g The current phase of the stage coil.

[0036] Consider the first k The preceding adjacent coil of the first stage coil is the second stage coil. k -1 grade coil and phase is , No. k The next coil after the first stage of the coil is the second stage. k +1 level coil and phase is - At this time, the adjacent coils of the preceding and following stages are in the th stage. k The induced voltage in the stage coil circuit is: in, I k-1 , I k+1 They represent the first k- Level 1, No. k+ The current in the first-stage coil, M k(k-1) , M k(k+1) They represent the first k- Level 1 coil and the first k Level coil, first k+ Level 1 coil and the first k Cross-inductance between coils θ k-1 , θ k+1 They represent the first k- Level 1 coil, the first k+ The current phase of the first-stage coil.

[0037] Adjacent coils in the preceding and following stages are in the first stage k The induced voltage generated by the first-stage coil circuit and the non-adjacent first-stage coil circuit g The first stage coil k The induced voltage generated in the coil circuit exhibits either in-phase or out-of-phase behavior. Since the induced voltage between adjacent coils is always numerically larger, the system can cancel out the current phase. Non-adjacent g The induced voltage of the first-stage coil, however, due to the cancellation of the induced voltage in the circuit, the first type of cross-coupling will cause the current second-stage coil to be affected. k The current in the stage coil circuit changes.

[0038] Category 2: If not adjacent g The phase of the coil current is or This boils down to a compensation-elimination type of cross-coupling, where the non-adjacent first... g The first stage coil k The induced voltage in the stage coil circuit is: No. k The self-induced voltage and capacitor voltage of the stage coil circuit are: Similarly, by utilizing the in-phase or out-of-phase relationship of voltage, the first... k The self-induced voltage compensation phase of the stage coil circuit is - The cross-coupled induced voltage, while the capacitor voltage compensation phase is The cross-coupled induced voltage.

[0039] Therefore, the first k The self-inductance, capacitance, and compensated cross-coupling of the stage coil circuit satisfy the following conditions: The classification is complete; adjust the compensation capacitor. C k The capacitance value is calculated based on the coil current, coil self-inductance, and the second type of cross-coupling. When the above conditions are met, the cross-coupling effect can be eliminated.

[0040] Step S3: Under the condition of eliminating coil cross-coupling in step S2, the current in each coil loop decreases by 90° step by step, resulting in the current phase distribution, which is expressed as: in, U inv This is the input voltage of the transmitting coil circuit. I i Indicates the first i The current in the stage coil, M i(i+1)R represents the mutual inductance between adjacent coils. eqi Indicates the first i The equivalent impedance of the coil, where ω is the system angular frequency.

[0041] The equivalent impedance of each coil loop conforms to the formula: Substituting the equivalent impedance expression into the current expression, we obtain the current in the constant current stage coil circuit and the output voltage in the constant voltage stage coil circuit as follows: The constant voltage stage coil current phase is 0° / -180°, and the constant current stage coil current phase is -90° / 90°.

[0042] Step S4: Further, the transmitting coil node is used to realize energy injection, the relay coil node is used to realize energy relay transmission, and the receiving coil node corresponds to the load terminal to realize load power supply.

[0043] All receiving coils couple energy only from the constant current stage relay coils at -90° / 90° as determined in step S3, and all receiving coils are constant voltage stage coils at 0° / -180° to achieve one-way multi-load constant voltage output.

[0044] The constant current stage relay coil is the energy flow branch node between the receiving coil and the next stage relay coil.

[0045] The next stage of the constant current stage relay coil is the constant voltage stage relay coil. The constant voltage characteristic of the constant voltage stage relay coil circuit means that the sum of the voltages across all impedances in the circuit is constant.

[0046] The arrangement and corresponding phase configuration of the transmitting coil and relay coils for a multi-load constant voltage output circuit are as follows: Transmitting coil (0°) -> Relay coil (-90°) -> Relay coil (-180°) -> Relay coil (90°) -> Relay coil (0°) -> ... Furthermore, the receiving coils (-180°, 0°) are configured to couple energy from the corresponding constant current relay coils (-90°, 90°) to form load terminal outputs.

[0047] S5: Based on the constant current stage coil current expression in S3, the expression for a multi-load output voltage is derived as follows: in, M k_oj For the first k The constant current stage relay coil and the first stage j indivual( j =1,2,…,s The mutual inductance between the receiving coils U oj For the first j indivual( j =1,2,…, s The output voltage of the load.

[0048] The current in each receiving coil loop is in line with the current. or The phase coil cross-coupling still needs to be compensated for and eliminated using the self-inductance and capacitance of the receiving coil circuit.

[0049] Furthermore, the load voltage output gain is affected by the mutual inductance between the energy transmission coil and the receiving coil. By adjusting the mutual inductance between the coils, the constant voltage power supply requirement of the zero-value monitoring sensor can be met. Using the number of turns and radius of each stage of the coil as optimization variables, the corresponding transmitting coil, relay coil and receiving coil are designed according to the hierarchical optimization order of first the energy transmission coil and then the receiving coil.

[0050] In a specific embodiment of the present invention, the following experimental steps are performed: (1) Step S1 The circuit equivalent model of a relay wireless power transfer system is as follows: Figure 2 As shown, it includes one transmitting circuit, three relay circuits, and three receiving circuits. The transmitting circuit includes a DC power supply. U in A high-frequency inverter (composed of switching transistors S1~S4, with output current and voltage expressed as follows) U inv and I 1) Transmitting coil (current is also...) I 1) Series compensation capacitor for the transmitting coil. The repeater circuit includes three repeater loops, each including a repeater coil and a series compensation capacitor for the repeater coil. The receiving circuit includes three load termination loops, each including a receiving coil, a series compensation capacitor, and a rectifier filter circuit (including diodes). D 1~ D A full-bridge rectifier and filter capacitor consisting of 4 components C f ) and load R Lj (Current and voltage are respectively represented by...) I oj and U oj express). Figure 2 In this circuit, there are four stages of power transmission coils: a transmitting coil and a multi-stage relay coil. The receiving coil corresponds to three load terminals. The mutual inductance between two adjacent coils is represented by M. i(i+1) , i =1,2,3, No.k The self-inductance of a coil is expressed as L k The internal resistance is expressed as R k The current is expressed as I k , No. k The series compensation capacitor of the stage coil is expressed as: C k , k =1,2,3,4, No. j The self-inductance of the receiving coil is expressed as L pj The internal resistance is expressed as R pj The current is expressed as I pj , No. j The series compensation capacitor of each receiving coil is expressed as: C pj , j =1,2,3.

[0051] Assuming all switching elements in the inverter are lossless ideal switching devices, and since the fundamental frequency component is much larger than the harmonic components generated by the resonant network, the equivalent model of the system is obtained based on the fundamental frequency analysis method as follows: Figure 3 As shown.

[0052] The relationship between the inverter's output voltage and the DC input voltage can be expressed as: (1) The equivalent load consisting of the rectifier, filter capacitor, and load can be expressed as: (2) Meanwhile, for ease of analysis, it is assumed that the equivalent load of the transmitting coil, relay coil, and receiving coil are all 0, that is: (3) (2) Step S2 With the current number k The current in the primary coil circuit is at 0 reference phase, and the cross-coupling effects between non-adjacent coils are categorized by the coil current phase.

[0053] Among them, the coil nodes of the self-eliminating cross-coupling type are as follows: Figure 4a , Figure 4b As shown. The ( ) k ±(1+2 a The first coil and the second coil k Cross-coupling between coils M k(k±(1+2a)) , where 1≤ k±(1+2 a )≤ n and a It is a positive integer. The ( )th k ±(1+2 a The current phase of the first coil is compared to that of the second coil. k The current phase of each coil leads or lags by 90°. At this time, the current phase of adjacent coils in the preceding and following stages is... k The induced voltage generated by the first-stage coil circuit is related to the non-adjacent ( k ±(1+2 a The first stage coil is in the... k The induced voltage generated in the coil circuit exhibits either in-phase or out-of-phase behavior. Since the induced voltage between adjacent coils is always numerically larger, the system can self-eliminate the current phase. Non-adjacent ( k ±(1+2 a The cross-coupling effect of the )) level coil.

[0054] Compensated and eliminated cross-coupling coil nodes, such as Figure 5a , Figure 5b As shown. The ( ) k ±2 a ) coil and the first k Cross-coupling between coils M k(k±2a) , where 1≤ k ±2 a ≤ n and a It is a positive integer. The ( )th k ±2 a The current phase of the first coil is -180° (out of phase) or 0° (in phase), and its phase is... k An induced voltage of ±90° is generated in the first-stage coil circuit. Therefore, the first... k The self-induced voltage compensation phase of the stage coil circuit is - The cross-coupled induced voltage, while the capacitor voltage compensation phase is The cross-coupled induced voltage, the first k The self-inductance, capacitance, and compensated cross-coupling of the stage coil circuit satisfy the conditions. (3) Step S3 Under conditions of no coil cross-coupling, the current in the 4-stage energy transfer coil loop decreases by 90° at each stage and is expressed as follows: in, U inv This is the input voltage of the transmitting coil loop. The equivalent impedance of each coil loop conforms to the formula: Substituting the equivalent impedance expression into the current expression, we obtain the current in the constant current stage coil circuit and the output voltage in the constant voltage stage coil circuit as follows: Furthermore, the phase of the constant voltage stage coil current is 0° / -180°, and the phase of the constant current stage coil current is -90° / 90°.

[0055] (4) Step S4 Step S4 involves analyzing the relationship between the coil node current phase and the multi-load constant voltage output based on the constant current stage coil distribution characteristics of the relay-type power transfer coil, determining the coil circuit phase configuration conditions for the multi-load constant voltage output, and forming a coil arrangement scheme for the transmitting coil node, relay coil node, and receiving coil (corresponding to the load terminal) node, as follows: All receiving coils couple energy only from constant current stage relay coils at -90° / 90°, and all receiving coils are constant voltage stage coils at 0° / -180° to achieve one-channel multi-load constant voltage output.

[0056] The constant current stage relay coil is the energy flow branch node between the receiving coil and the next stage relay coil.

[0057] The next stage of the constant current stage relay coil is the constant voltage stage relay coil. The constant voltage characteristic of the constant voltage stage relay coil circuit means that the sum of the voltages across all impedances in the circuit is constant.

[0058] The coil arrangement and corresponding phase configuration conditions for the resulting multi-load constant voltage output are as follows: Transmitting coil (0°) -> Relay coil (-90°) -> Relay coil (-180°) -> Relay coil (90°) -> Relay coil (0°) -> ... (5) Step S5 Both the second and fourth stage energy transmission coils are constant current stage relay coils. Energy is coupled from the constant current stage relay coils to form the load terminal output. If the mutual inductance between the first load receiving coil and the second stage relay coil is... M 2_o1 The mutual inductance between the second load receiving coil and the fourth relay coil is M 4_o2 The mutual inductance between the third load receiving coil and the fourth relay coil is M 4_o3 The expressions for the output voltages of the three loads are as follows: The current in each receiving coil loop is in line with the current. or The cross-coupling of the phase coils still needs to be compensated and eliminated using the self-inductance and capacitance of the receiving coil circuit. The compensation capacitance of each coil is calculated based on the compensation elimination type cross-coupling suppression method.

[0059] Based on the 5V constant voltage power supply requirement of the zero-value monitoring sensor, the number of turns and radius of each stage of the planar spiral coil were designed and optimized, and the inductance matrix of the corresponding transmitting coil, relay coil and receiving coil was finally obtained as shown in Table 1 (unit: μH).

[0060] Table 1

[0061] In the inductance matrix of Table 1, the diagonal elements represent self-inductance, and the others represent the mutual inductance between the corresponding two coils. The compensation capacitance of the coil circuit calculated according to the compensation elimination type cross-coupling suppression method is shown in Table 2 (unit: nF).

[0062] Table 2

[0063] The following experiment uses a repeater wireless power transfer system with 3 load outputs for verification. The experimental prototype is as follows: Figure 6 As shown.

[0064] After configuring the compensation capacitors for each stage of the coil, the current phase distribution of each stage of the coil is analyzed, such as... Figures 7a-7d As shown, the experimental waveforms of the input voltage and the current of each stage of the coil are presented. From Figures 7a-7d It can be seen that, with the input voltage as the reference phase of 0, the current of each stage of the coil... I 1. I 2. I 3. I The phase of 4 is -4.7. o -88.9 o -174.5 o 87.7 o This formed approximately 90 o A phase distribution pattern that decreases progressively.

[0065] Furthermore, the DC load at each coil terminal was changed, and the effect of the DC load change on the system output voltage was observed. Figure 8a , Figure 8c As shown. From Figure 8a It can be seen that when the DC load R L1 When the impedance changes from 30Ω to 60Ω to 90Ω, the load output voltage at all three coil terminals maintains a constant output voltage; Figure 8b It can be seen that when the DC load R L2When the impedance changes from 30Ω to 60Ω to 90Ω, the load output voltage at all three coil terminals maintains a constant output voltage; Figure 8c It can be seen that when the DC load R L3 When the voltage changes from 30Ω to 60Ω to 90Ω, the load output voltage at all three coil terminals can maintain a constant output voltage.

[0066] The experimental results show that the multi-load constant voltage power supply method for a relay-type wireless power transmission system for online monitoring of zero-value insulators provided by this invention achieves multi-load constant voltage output of the relay-type wireless power transmission system by designing a receiving coil coupled to the constant current stage coil. Furthermore, the magnetic coupling coil structure designed in this invention is simple and facilitates practical installation and deployment. Therefore, in practical applications, multiple receiving coils can be flexibly arranged according to the spatial distribution of the zero-value monitoring sensors to achieve continuous and reliable power supply to the zero-value insulator monitoring sensors.

[0067] Therefore, the present invention provides a multi-load constant voltage power supply method for a relay-type wireless power transmission system for online monitoring of zero-value insulators. This method uses the current phase configuration of each coil circuit as the condition for achieving multi-load constant voltage output. Furthermore, by deriving the multi-load output voltage expression of the relay-type wireless power transmission system, it guides the design of transmitting coils, relay coils, and terminal coils that meet the constant voltage power supply requirements of zero-value insulators, thus realizing multi-load constant voltage output of a relay-type wireless power transmission system with multiple loads on a single line. The present invention achieves multi-load constant voltage output by adding terminal coils at each constant current stage relay coil node, overcoming the drawback of current relay-type wireless power transmission systems that only provide one constant voltage output. It eliminates the need for complex decoupling coil structures and circuit compensation topologies, providing a solution for power supply scenarios for online monitoring of zero-value insulators.

[0068] Exemplary device Figure 9 This is a schematic diagram of the structure of a multi-load constant voltage power supply device for a relay wireless power transmission system provided in an exemplary embodiment of the present invention. Figure 9 As shown, the device 900 includes: Module 910 is used to establish the circuit equivalent model of the relay wireless power transmission system. The circuit equivalent model includes one transmitting coil, n-1 relay coils (a total of n power transmission coils), and s receiving coils. Elimination module 920 is used to analyze the cross-coupling effect between non-adjacent energy transmission coils with the premise that the loop current of n energy transmission coils decreases by 90° step by step, and classifies the cross-coupling effect according to the current phase relationship, thereby canceling the cross-coupling effect at the circuit level. The module 930 is used to derive the loop voltage and loop current of n energy transmission coils under the condition of eliminating coil cross-coupling, and to determine the current phase distribution, current expression and voltage expression of the constant current stage coil and the constant voltage stage coil. The forming module 940 is used to determine the coil circuit phase configuration conditions for multi-load constant voltage output based on the current phase distribution, and to form the coil arrangement scheme of the transmitting coil node, the relay coil node, and the receiving coil node. The optimization module 950 is used to derive the multi-load output voltage expression of the relay wireless power transmission system based on the current expression of the constant current stage coil, and to optimize the design of the corresponding coil layout scheme based on the constant voltage power supply requirements of the zero-value monitoring sensor.

[0069] Optionally, the cross-coupling effects between non-adjacent energy transfer coils are analyzed, and the cross-coupling effects are categorized according to the current phase relationship, including: Taking the loop current of the current k-th stage energy transfer coil as the 0 reference phase, the cross-coupling effects between non-adjacent energy transfer coils are categorized by coil current phase, including: Type 1: If the current phase of the non-adjacent g-th stage energy transmission coil is -90° or 90°, it is classified as a self-eliminating cross-coupling. The second type: If the current phase of the non-adjacent g-th stage energy transmission coil is 0° or 180°, it is classified as a compensated elimination type of cross coupling.

[0070] Optionally, the elimination principle of self-eliminating cross-coupling is as follows: The non-adjacent g-th stage energy transmission coil generates a first induced voltage in the circuit of the k-th stage energy transmission coil, and the adjacent (k-1)-th and (k+1)-th stage energy transmission coils generate a second induced voltage in the circuit of the k-th stage energy transmission coil. When the first induced voltage and the second induced voltage are in opposite phase, the first induced voltage is canceled out. The principle of compensation-based cross-coupling elimination is as follows: The self-induced voltage and capacitor voltage of the k-th stage energy transfer coil circuit are used to compensate for the cross-coupling effects caused by non-adjacent g-th stage energy transfer coils with current phases of 0° or 180°, where the k-th stage energy transfer coil circuit is the self-induced voltage and capacitor voltage. k The self-inductance, capacitance, and compensated cross-coupling of the stage coil circuit satisfy the following conditions: In the formula, U Lk Representing the k The self-induced voltage of the stage coil circuit, U Ck Representing the k The voltage of the compensation capacitor in the stage coil circuit.U kg Representing the g The first stage coil k The induced voltage of the coil.

[0071] Optionally, under the condition of eliminating coil cross-coupling, the loop current of each stage of the energy transfer coil decreases by 90° step by step, and the resulting current phase distribution is expressed as: in, U inv This is the input voltage of the transmitting coil circuit. I i Indicates the first i The current in the stage coil, M i(i+1) R represents the mutual inductance between adjacent coils. eqi Indicates the first i The equivalent impedance of the coil, where ω is the system angular frequency; The current expression for the constant current stage coil circuit and the output voltage expression for the constant voltage stage coil circuit are as follows: The constant voltage stage coil current phase is 0° / -180°, and the constant current stage coil current phase is -90° / 90°. U inv This represents the output voltage of the inverter. M (2i+1)(2i) This represents the mutual inductance between the (2i+1)th stage coil and the 2ith stage coil. M (2i-1)(2i) This represents the mutual inductance between the 2i-1 level coil and the 2i level coil. I k_even Representing the k The current in the constant current stage coil, U k_odd Representing the k The voltage of the constant voltage stage coil.

[0072] Optionally, the constant current stage coil is an energy transmission coil with a current phase of -90° or 90°, and the constant voltage stage coil is an energy transmission coil with a current phase of 0° or -180°.

[0073] Alternatively, the coil arrangement can be as follows: The transmitting coil node is used to achieve energy injection; Relay coil nodes are used to achieve relay transmission of energy; The receiving coil node corresponds to the load terminal to provide power to the load. All receiving coils couple energy only from constant current stage coils, and each receiving coil is a constant voltage stage coil to achieve one-way multi-load constant voltage output; The constant current stage coil serves as the energy flow branch node between the receiving coil and the next stage relay coil; The next stage relay coil after the constant current stage coil is the constant voltage stage coil. The sum of the voltages across all impedances in the circuit of the constant voltage stage coil is constant.

[0074] Optionally, the arrangement scheme and corresponding phase configuration conditions of the transmitting coil and each relay coil of the multi-load constant voltage output are as follows: Transmitting coil (0°) → Relay coil (-90°) → Relay coil (-180°) → Relay coil (90°) → Relay coil (0°) → ……; Furthermore, receiving coils with current phases of -180° or 0° are configured to couple energy from corresponding constant current stage coils with current phases of -90° or 90°, respectively, to form load terminal output.

[0075] Optionally, the multi-load output voltage expression is: In the formula, M k_oj For the first k The constant current stage relay coil and the first stage j indivual( j =1,2,…, s The mutual inductance between the receiving coils U oj For the first j indivual( j =1,2,…, s The output voltage of the load, ω is the system angular frequency. I k_even Representing the k The current in the constant current stage coil, U inv This represents the output voltage of the inverter. M (2i+1)(2i) This represents the mutual inductance between the (2i+1)th stage coil and the 2ith stage coil. M (2i-1)(2i) This represents the mutual inductance between the 2i-1 level coil and the 2i level coil.

[0076] Optionally, based on the constant voltage power supply requirements of the zero-value monitoring sensor, the corresponding coil arrangement scheme is optimized, including: By adjusting the mutual inductance between the energy transmission coil and the receiving coil, the constant voltage power supply requirement of the zero-value monitoring sensor is met. The optimization design sequence is as follows: using the number of turns and radius of each level of coil as optimization variables, and following the hierarchical optimization sequence of first optimizing the energy transmission coil and then optimizing the receiving coil, design the corresponding transmitting coil, relay coil and receiving coil.

[0077] Exemplary electronic devices Figure 10 This is the structure of an electronic device provided in an exemplary embodiment of the present invention. For example... Figure 10 As shown, the electronic device 100 includes one or more processors 101 and memory 102.

[0078] The processor 101 may be a central processing unit (CPU) or other form of processing unit with data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device to perform desired functions.

[0079] The memory 102 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 101 may execute the program instructions to implement the methods of the software programs of the various embodiments of the present invention described above, and / or other desired functions. In one example, the electronic device may also include an input device 103 and an output device 104, these components being interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0080] In addition, the input device 103 may also include, for example, a keyboard, a mouse, etc.

[0081] The output device 104 can output various information to the outside. The output device 104 may include, for example, a display, a speaker, a printer, and a communication network and its connected remote output devices, etc.

[0082] Of course, for the sake of simplicity, Figure 10 Only some of the components of this electronic device relevant to the present invention are shown, omitting components such as buses, input / output interfaces, etc. In addition, the electronic device may include any other suitable components depending on the specific application.

[0083] Exemplary computer program products and computer-readable storage media In addition to the methods and apparatus described above, embodiments of the present invention may also be computer program products, which include computer program instructions that, when executed by a processor, cause the processor to perform the steps in the methods according to various embodiments of the present invention described in the "Exemplary Methods" section above.

[0084] The computer program product can be written in any combination of one or more programming languages ​​to perform the operations of the embodiments of the present invention. The programming languages ​​include object-oriented programming languages ​​such as Java and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0085] Furthermore, embodiments of the present invention may also be computer-readable storage media storing computer program instructions thereon, which, when executed by a processor, cause the processor to perform the steps of the methods according to various embodiments of the present invention described in the "Exemplary Methods" section above.

[0086] The computer-readable storage medium may be any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, system, or device, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0087] The basic principles of the present invention have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in the present invention are merely examples and not limitations, and should not be considered as essential features of each embodiment of the present invention. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the present invention to the necessity of employing the aforementioned specific details.

[0088] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For system embodiments, since they largely correspond to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0089] The block diagrams of devices, systems, devices, and systems involved in this invention are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, systems, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0090] The methods and systems of the present invention may be implemented in many ways. For example, they may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order of steps for the methods is for illustrative purposes only, and the steps of the methods of the present invention are not limited to the order specifically described above unless otherwise specifically stated. Furthermore, in some embodiments, the present invention may also be implemented as a program recorded on a recording medium, the program comprising machine-readable instructions for implementing the methods according to the present invention. Thus, the present invention also covers recording media storing programs for performing the methods according to the present invention.

[0091] It should also be noted that in the systems, apparatus, and methods of the present invention, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered equivalents of the present invention. The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the invention. Therefore, the invention is not intended to be limited to the aspects shown herein, but rather to be carried out within the widest scope consistent with the principles and novel features disclosed herein.

[0092] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the invention to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations therein.

Claims

1. A method for constant voltage power supply for multiple loads in a relayed wireless power transfer system, characterized in that, include: Establish a circuit equivalent model for a relay-type wireless power transmission system, wherein the circuit equivalent model includes one transmitting coil, n-1 relay coils (a total of n power transmission coils), and s receiving coils; With the premise that the loop current of the n energy transmission coils decreases by 90° step by step, the cross-coupling effect between non-adjacent energy transmission coils is analyzed, and the cross-coupling effect is classified according to the current phase relationship to cancel the cross-coupling effect at the circuit level. Under the condition of eliminating the cross-coupling of the coils, the loop voltage and loop current of the n energy transmission coils are derived, and the current phase distribution, current expression and voltage expression of the constant current stage coil and the constant voltage stage coil are determined. Based on the current phase distribution, the phase configuration conditions of the coil circuit for the multi-load constant voltage output are determined, and a coil arrangement scheme for the transmitting coil node, relay coil node, and receiving coil node is formed. Based on the current expression of the constant current stage coil, the multi-load output voltage expression of the relay wireless power transmission system is derived, and the constant voltage power supply requirement of the zero-value monitoring sensor is used to optimize the design of the corresponding coil layout scheme.

2. The method of claim 1, wherein, The cross-coupling effects between non-adjacent energy transfer coils are analyzed, and these effects are categorized according to current phase relationships, including: Taking the loop current of the current k-th stage energy transfer coil as the 0 reference phase, the cross-coupling effects between non-adjacent energy transfer coils are categorized by coil current phase, including: Category 1: If the current phase of the non-adjacent energy transmission coils of the g-th stage is -90° or 90°, it is classified as a self-eliminating cross-coupling. Category 2: If the current phase of the energy transmission coil of the non-adjacent g-th stage is 0° or 180°, it is classified as a compensated elimination type cross-coupling.

3. The method of claim 2, wherein, The elimination principle of the self-eliminating cross-coupling is as follows: The non-adjacent energy transmission coil of the g-th stage generates a first induced voltage in the circuit of the energy transmission coil of the k-th stage, and the adjacent energy transmission coils of the (k-1)-th and (k+1)-th stages generate a second induced voltage in the circuit of the energy transmission coil of the k-th stage. When the first induced voltage and the second induced voltage are in opposite phase, the first induced voltage is canceled out. The principle of eliminating the compensated cross-coupling is as follows: The self-induction voltage and the capacitance voltage of the energy transmission coil loop of the kth stage are used to compensate the cross-coupling effect generated by the energy transmission coil of the non-adjacent gth stage with a current phase of 0° or 180°, wherein the kth stage is adjacent to the gth stage. k The self-induction, capacitance and compensation elimination cross-coupling of the coil loop of the kth stage satisfy the condition: In the formula, U Lk Representing the k The self-induced voltage of the stage coil circuit, U Ck Representing the k The voltage of the compensation capacitor in the stage coil circuit. U kg Representing the g The first stage coil k The induced voltage of the coil.

4. The method of claim 3, wherein, Under the condition of eliminating the cross-coupling of the coils, the loop current of each stage of the energy transmission coil decreases by 90° step by step, and the resulting current phase distribution is expressed as follows: in, U inv This is the input voltage of the transmitting coil circuit. I i Indicates the first i The current in the stage coil, M i(i+1) R represents the mutual inductance between adjacent coils. eqi Indicates the first i The equivalent impedance of the coil, where ω is the system angular frequency; The current expression for the constant current stage coil circuit and the output voltage expression for the constant voltage stage coil circuit are as follows: The constant voltage stage coil current phase is 0° / -180°, and the constant current stage coil current phase is -90° / 90°. U inv This represents the output voltage of the inverter. M (2i+1)(2i) This represents the mutual inductance between the (2i+1)th stage coil and the 2ith stage coil. M (2i-1)(2i) This represents the mutual inductance between the 2i-1 level coil and the 2i level coil. I k_even Representing the k The current in the constant current stage coil, U k_odd Representing the k The voltage of the constant voltage stage coil.

5. The method according to claim 4, characterized in that, The constant current stage coil is the energy transmission coil with a current phase of -90° or 90°, and the constant voltage stage coil is the energy transmission coil with a current phase of 0° or -180°.

6. The method according to claim 1, characterized in that, The coil arrangement scheme is as follows: The transmitting coil node is used to achieve energy injection; The relay coil node is used to realize the relay transmission of energy; The receiving coil node corresponds to the load terminal to provide load power. All of the receiving coils couple energy only from the constant current stage coil, and each of the receiving coils is a constant voltage stage coil, to achieve a single multi-load constant voltage output; The constant current stage coil serves as the energy flow branch node between the receiving coil and the next-level relay coil; The next stage of the constant current stage coil is the relay coil, and the sum of the voltages across all impedances in the circuit of the constant voltage stage coil is constant.

7. The method according to claim 6, characterized in that, The arrangement scheme and corresponding phase configuration conditions of the transmitting coil and each relay coil of the multi-load constant voltage output are as follows: Transmitting coil (0°) → Relay coil (-90°) → Relay coil (-180°) → Relay coil (90°) → Relay coil (0°) → ……; Furthermore, the receiving coil configured with a current phase of -180° or 0° couples energy from the corresponding constant current stage coil with a current phase of -90° or 90°, respectively, to form a load terminal output.

8. The method according to claim 1, characterized in that, The expression for the multi-load output voltage is: In the formula, M k_oj For the first k The constant current stage relay coil and the first stage j indivual( j =1,2,…, s The mutual inductance between the receiving coils U oj For the first j indivual( j =1,2,…, s The output voltage of the load, ω is the system angular frequency. I k_even Representing the k The current in the constant current stage coil, U inv This represents the output voltage of the inverter. M (2i+1)(2i) This represents the mutual inductance between the (2i+1)th stage coil and the 2ith stage coil. M (2i-1)(2i) This represents the mutual inductance between the 2i-1 level coil and the 2i level coil.

9. The method according to claim 1, characterized in that, Based on the constant voltage power supply requirements of the zero-value monitoring sensor, the corresponding coil arrangement scheme is optimized, including: By adjusting the mutual inductance between the energy transmission coil and the receiving coil, the constant voltage power supply requirement of the zero-value monitoring sensor is met. The optimization design sequence is as follows: using the number of turns and radius of each level of coil as optimization variables, and following a hierarchical optimization sequence of first optimizing the energy transmission coil and then optimizing the receiving coil, the corresponding transmitting coil, relay coil and receiving coil are designed.

10. A multi-load constant voltage power supply device for a relay wireless power transmission system, characterized in that, include: A module is established to establish a circuit equivalent model of a relay wireless power transmission system. The circuit equivalent model includes one transmitting coil, n-1 relay coils (a total of n power transmission coils), and s receiving coils. The elimination module is used to analyze the cross-coupling effect between non-adjacent energy transmission coils, with the loop current of the n energy transmission coils decreasing by 90° step by step as a prerequisite, and to classify the cross-coupling effect according to the current phase relationship, thereby canceling the cross-coupling effect at the circuit level. The determination module is used to derive the loop voltage and loop current of the n energy transmission coils under the condition of eliminating the cross coupling of the coils, and to determine the current phase distribution, current expression and voltage expression of the constant current stage coil and the constant voltage stage coil. The forming module is used to determine the coil circuit phase configuration conditions of the multi-load constant voltage output coil based on the current phase distribution, and to form the coil arrangement scheme of the transmitting coil node, the relay coil node, and the receiving coil node. The optimization module is used to derive the multi-load output voltage expression of the relay wireless power transmission system based on the current expression of the constant current stage coil, and optimize the design of the corresponding coil arrangement scheme based on the constant voltage power supply requirements of the zero-value monitoring sensor.

11. The apparatus according to claim 10, characterized in that, The cross-coupling effects between non-adjacent energy transfer coils are analyzed, and these effects are categorized according to current phase relationships, including: Taking the loop current of the current k-th stage energy transfer coil as the 0 reference phase, the cross-coupling effects between non-adjacent energy transfer coils are categorized by coil current phase, including: Category 1: If the current phase of the non-adjacent energy transmission coils of the g-th stage is -90° or 90°, it is classified as a self-eliminating cross-coupling. Category 2: If the current phase of the energy transmission coil of the non-adjacent g-th stage is 0° or 180°, it is classified as a compensated elimination type cross-coupling.

12. The apparatus according to claim 11, characterized in that, The elimination principle of the self-eliminating cross-coupling is as follows: The non-adjacent energy transmission coil of the g-th stage generates a first induced voltage in the circuit of the energy transmission coil of the k-th stage, and the adjacent energy transmission coils of the (k-1)-th and (k+1)-th stages generate a second induced voltage in the circuit of the energy transmission coil of the k-th stage. When the first induced voltage and the second induced voltage are in opposite phase, the first induced voltage is canceled out. The principle of eliminating the compensated cross-coupling is as follows: The self-induced voltage and capacitor voltage of the energy transfer coil circuit of the k-th stage are used to compensate for the cross-coupling effect caused by the non-adjacent energy transfer coils of the g-th stage with current phases of 0° or 180°, wherein the k-th stage... k The self-inductance, capacitance, and compensated cross-coupling of the stage coil circuit satisfy the following conditions: In the formula, U Lk Representing the k The self-induced voltage of the stage coil circuit, U Ck Representing the k The voltage of the compensation capacitor in the stage coil circuit. U kg Representing the g The first stage coil k The induced voltage of the coil.

13. The apparatus according to claim 12, characterized in that, Under the condition of eliminating the cross-coupling of the coils, the loop current of each stage of the energy transmission coil decreases by 90° step by step, and the resulting current phase distribution is expressed as follows: in, U inv This is the input voltage of the transmitting coil circuit. I i Indicates the first i The current in the stage coil, M i(i+1) R represents the mutual inductance between adjacent coils. eqi Indicates the first i The equivalent impedance of the coil, where ω is the system angular frequency; The current expression for the constant current stage coil circuit and the output voltage expression for the constant voltage stage coil circuit are as follows: The constant voltage stage coil current phase is 0° / -180°, and the constant current stage coil current phase is -90° / 90°. U inv This represents the output voltage of the inverter. M (2i+1)(2i) This represents the mutual inductance between the (2i+1)th stage coil and the 2ith stage coil. M (2i-1)(2i) This represents the mutual inductance between the 2i-1 level coil and the 2i level coil. I k_even Representing the k The current in the constant current stage coil, U k_odd Representing the k The voltage of the constant voltage stage coil.

14. A computer-readable storage medium, characterized in that, The storage medium stores a computer program for performing the method described in any one of claims 1-9.

15. An electronic device, characterized in that, The electronic device includes: processor; Memory used to store the processor's executable instructions; The processor is configured to read the executable instructions from the memory and execute the instructions to implement the method described in any one of claims 1-9.

Images