A multi-load wireless power transmission system and design method

Abstract

This invention belongs to the field of underwater wireless power transmission technology and discloses a multi-load wireless power transmission system and design method. The system includes a multi-load coil coupling mechanism and a resonant compensation circuit. The multi-load coil coupling mechanism is used to perform operational tasks, and the resonant compensation circuit is used to transmit power to the multi-load coil coupling mechanism. The invention can be used in environments with any number of loads, has minimal interference between secondary sides, and provides stable multi-load transmission. The coil structure is simple, significantly reducing design complexity.

Description

Technical Field

[0001] The present invention belongs to the technical field of underwater wireless power transmission, and in particular relates to a multi-load wireless power transmission system and a design method thereof. Background Art

[0002] With the continuous deepening of ocean research and the increasing complexity of military needs, multi-underwater vehicle collaborative systems have become a new hotspot in the underwater vehicle field. A typical example is the mother-and-child split-type multi-payload underwater vehicle, which consists of a large mother AUV and multiple smaller daughter AUVs. The daughter AUVs can detach freely and operate independently; the mother AUV stays in the rear, providing energy and issuing commands, and collaborates with the daughter AUVs to carry out tasks such as mine laying, maritime hunting, mine countermeasures, underwater protection, ocean surveys, and intelligence monitoring.

[0003] For a cluster of parent-child separated underwater vehicles, the child AUVs need to be powered in a timely manner to achieve efficient work. However, the conductivity of seawater and the impact of ocean currents make traditional wet-plug cable charging prone to entanglement and wear when powering multiple loads at the same time, resulting in poor flexibility and great safety hazards.

[0004] Current underwater wireless power transmission technology utilizes the principle of magnetic coupling induction to wirelessly transmit electrical energy from one end to another, offering an innovative solution to the underwater energy resupply problem for AUVs. However, practical application of wireless power transmission in "mother-and-child" split-type, one-to-many underwater vehicles still faces challenges. Conventional magnetic coupling mechanisms operate on a one-to-one basis, making them impractical for wireless charging in such split-type, one-to-many underwater vehicles. Furthermore, magnetic coupling between loads can lead to interference in one-to-many underwater wireless power transmission. Therefore, achieving simultaneous energy transmission without interference between multiple loads and improving power transmission efficiency is an urgent issue.

[0005] Current research mainly realizes multi-load wireless charging through the following two aspects of design: one is the design of magnetic coupling mechanism, which mainly includes the coupling design of primary and secondary coils and the decoupling design between secondary coils; the other is the design of resonant compensation circuit. Summary of the Invention

[0006] To solve the problems existing in the prior art, the present invention provides a multi-load wireless power transmission system and design method, which are designed to realize multi-load wireless charging: one is the design of the magnetic coupling mechanism, which mainly includes the coupling design of the primary and secondary coils and the decoupling design between the secondary coils; the other is the design of the resonant compensation circuit.

[0007] To achieve the above object, the present invention provides the following solutions:

[0008] A multi-load wireless power transmission system, comprising: a multi-load coil coupling mechanism and a resonance compensation circuit;

[0009] A multi-load coil coupling mechanism is used to perform operational tasks;

[0010] The resonant compensation circuit is used to transfer power to the multi-load coil coupling mechanism.

[0011] Preferably, the multi-load coil coupling mechanism includes two parts: a mother AUV transmitting coil and a daughter AUV receiving coil;

[0012] The mother AUV transmitting coil is a cylindrical solenoid coil, and the daughter AUV receiving coil is a curved solenoid coil. The transmitting and receiving side magnetic cores are placed on the inside of the solenoid.

[0013] Preferably, the resonant compensation circuit adopts an LCC-S compensation topology.

[0014] The present invention also provides a design method for a multi-load wireless power transmission system, which is implemented by the aforementioned system and includes:

[0015] Based on actual application requirements, namely the number of sub-AUVs and transmission distance, the constraints of small mutual inductance between the receiving coils of each sub-AUV and large mutual inductance between the transceiver coils of the parent and sub-AUVs are added to design the parameters of the mother AUV's transmitting coil and the receiving coils of each sub-AUV.

[0016] Electromagnetic simulation was performed in Ansys Maxwell software to obtain the self-inductance L of the mother AUV transmitting coil. p , the self-inductance L of each sub-AUV receiving coil s1 ~L si , the mutual inductance M between the transmitting and receiving coils ps1 ~M psi , the mutual inductance M between the receiving coils s(i)(j) , verify the correctness of the designed mother-child underwater vehicle wireless power transmission coupling mechanism, where i, j = 1, 2, ..., n, n is the number of sub-AUVs;

[0017] Based on the electromagnetic simulation results, according to the resonance calculation formula Design the series compensation inductor L f1 , parallel compensation capacitor C f1 , series compensation capacitors C1 and C2 component parameters;

[0018] Using Simiulink software, we built a circuit model of the LCC-S resonant compensation wireless power transmission system for simulation analysis to verify whether the power and efficiency of the energy transmission circuit meet the requirements.

[0019] The current parameters obtained from the simulation are brought into the Maxwell electromagnetic simulation to detect whether the magnetic core is saturated. If it is saturated, the magnetic core structure is redesigned. If it is not saturated, the wireless power transmission system design is completed.

[0020] Preferably, electromagnetic simulation is performed in Ansys Maxwell software to obtain the self-inductance L of the mother AUV transmitting coil. p , the self-inductance L of each sub-AUV receiving coil s1 ~L si , the mutual inductance M between the transmitting and receiving coils ps1 ~M psi , the mutual inductance M between the receiving coils s(i)(j) ,The method for verifying the correctness of the designed wireless power transmission coupling mechanism of the mother-and-child underwater vehicle includes:

[0021] Let k be the coupling coefficient between coils, and the relationship between the coil self-inductance and mutual inductance is as follows:

[0022] ;

[0023] Among them, k psi is the coupling coefficient between the mother AUV transmitting coil and the i-th child AUV receiving coil, k ij is the coupling coefficient between the i-th and j-th receiving coils. The coupling coefficient represents the magnetic coupling state between the coils. The coupling coefficient < 0.05 is considered decoupling. The self-inductance L of the mother AUV transmitting coil obtained by simulation is p and the self-inductance L of the AUV receiving coil si , Mutual inductance of the transceiver coil M psi , the mutual inductance M between the receiving coils sij , calculate the coupling coefficient k psi 、k ij , k psi >0.05, k ij <0.05, the transceiver coils of the parent and child AUVs are magnetically coupled, and the receiving coils of the child AUVs are decoupled from each other.

[0024] Preferably, the energy transmission circuit structure adopts LCC-S topology, and the energy transmission frequency is ω p , V in is the input voltage, L f1 、C f1 , C1, L p They are respectively represented by the primary side compensation inductance, parallel compensation capacitor, series compensation capacitor, and coupling coil self-inductance; C 2i 、L si Respectively represent the i-th secondary side compensation capacitor and coupling coil self-inductance; M psi represents the mutual inductance between the i-th receiving coil and the transmitting coil, R Li With V out_i is the load and receiving voltage of the i-th energy receiving end, P out_i is the receiving end power, and the parameters must satisfy the following relationship:

[0025] ;

[0026] Get the output voltage V out-i , the transmission power of electric energy P out-i as follows:

[0027] .

[0028] Preferably, there is no interference between the loads of each sub-AUV, that is, when the number of coils at the receiving end changes, the wireless power transmission system still has the ability to work normally, and the number of loads can be changed as required.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. Can be used in any number of load environments.

[0031] 2. The interference between the secondary sides is small, and the multi-load transmission effect is stable.

[0032] 3. The coil structure is simple, greatly reducing the design complexity. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 This is a flow chart of a design method for a multi-load wireless power transmission system according to an embodiment of the present invention;

[0035] Figure 2 Schematic diagram of the coil coupling mechanism of the wireless power transmission system under load conditions in Example 3 of the present invention;

[0036] Figure 3 Schematic diagram of a wireless power transmission circuit system based on LCC-S resonance compensation according to an embodiment of the present invention. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Example 1

[0040] This embodiment provides a multi-load wireless power transmission system, the system comprising: a multi-load coil coupling mechanism and a resonance compensation circuit;

[0041] A multi-load coil coupling mechanism is used to perform operational tasks;

[0042] The resonant compensation circuit is used to transfer power to the multi-load coil coupling mechanism.

[0043] In this embodiment, the multi-load coil coupling mechanism includes two parts: a mother AUV transmitting coil and a daughter AUV receiving coil;

[0044] The coupling mechanism consists of two parts: the mother AUV's transmitting coil and the daughter AUV's receiving coil. The mother AUV's transmitting coil is a cylindrical solenoid coil, while the daughter AUV's receiving coil is a curved solenoid coil. The transmitting and receiving magnetic cores are placed inside the solenoids to improve magnetic field distribution and enhance the coupling strength between the transmitting and receiving coils.

[0045] In this embodiment, the resonant compensation circuit adopts an LCC-S compensation topology.

[0046] Specifically, taking the 1 to 3 structure as an example, Figure 2 This is the wireless power transmission coupling mechanism for a mother-and-child underwater vehicle. A cylindrical helical tube transmitting coil is placed in the mother AUV, while a curved helical tube receiving coil is placed in the daughter AUV. The transmitting and receiving magnetic cores are placed flush against the inner sides of the helical tubes to improve magnetic field distribution and reduce interference with electronic components in the central area. When multiple daughter vehicles need to charge, they can approach the mother AUV and begin charging by pointing their receiving coils toward the mother.

[0047] Example 2

[0048] Wireless power transmission system design process Figure 1 As shown, the present invention also provides a design method for a multi-load wireless power transmission system, which is implemented by the aforementioned system and includes:

[0049] Based on actual application requirements, namely the number of sub-AUVs and transmission distance, the constraints of small mutual inductance between the receiving coils of each sub-AUV and large mutual inductance between the transceiver coils of the parent and sub-AUVs are added to design the parameters of the mother AUV's transmitting coil and the receiving coils of each sub-AUV. The transceiver coils of the parent and sub-AUVs are large in size and have many turns, and their own self-inductance is large.

[0050] Electromagnetic simulation was performed in Ansys Maxwell software. Based on the design parameters mentioned above, a cylindrical solenoid transmitting coil and an arc-shaped solenoid coil model were established, and electromagnetic simulation was performed at the required operating frequency. According to the electromagnetic simulation results, the number of coil turns, the spacing between the mother and child transceiver coils, and other parameters were adjusted until the self-inductance of the mother and child transceiver coils, the mutual inductance between the mother and child transceiver coils, and their coupling coefficients were appropriate. Excessive self-inductance will cause the voltage at both ends of the coil to be too high, causing the connector to break down. However, the compensation capacitor voltage is low and the capacitor volume is reduced. Its size is determined according to the actual withstand voltage and capacitor volume requirements. The mutual inductance and coupling coefficient affect the coil transmission performance. Usually, the power transmission between the primary and secondary sides is confirmed based on the coupling coefficient. A coupling coefficient of <0.05 is considered decoupling. The mother AUV transmitting coil self-inductance L is obtained. p , the self-inductance L of each sub-AUV receiving coil s1 ~L si , the mutual inductance M between the transmitting and receiving coils ps1 ~M psi , the mutual inductance M between the receiving coils s(i)(j) etc., to verify the correctness of the designed mother-and-child underwater vehicle wireless power transmission coupling mechanism, where i, j = 1, 2, …, n, n is the number of sub-AUVs;

[0051] The power transmission circuit adopts LCC-S compensation topology, which has the characteristics of constant current in the transmitting coil and constant voltage in the receiving coil. Based on the electromagnetic simulation results, according to the resonance calculation formula Design the series compensation inductor L f1 , parallel compensation capacitor C f1 , series compensation capacitors C1, C2 and other component parameters;

[0052] Using Simiulink software, we built a circuit model of the LCC-S resonant compensation wireless power transmission system for simulation analysis. We substituted the parameters obtained from the previous electromagnetic simulation and the component parameters derived from the resonance relationship, observed the input and output voltage waveforms and input and output power, and verified whether the power and efficiency of the energy transmission circuit met the requirements.

[0053] The current parameters obtained from the simulation are brought into the Maxwell electromagnetic simulation to detect whether the magnetic core is saturated. If it is saturated, the magnetic core structure is redesigned. If it is not saturated, the wireless power transmission system design is completed.

[0054] In this embodiment, electromagnetic simulation is performed in Ansys Maxwell software to obtain the self-inductance L of the mother AUV transmitting coil. p , the self-inductance L of each sub-AUV receiving coil s1 ~L si , the mutual inductance M between the transmitting and receiving coils ps1 ~M psi , the mutual inductance M between the receiving coils s(i)(j),The method for verifying the correctness of the designed wireless power transmission coupling mechanism of the mother-and-child underwater vehicle includes:

[0055] Let k be the coupling coefficient between coils, and the relationship between the coil self-inductance and mutual inductance is as follows:

[0056] ;

[0057] Among them, k psi is the coupling coefficient between the mother AUV transmitting coil and the i-th child AUV receiving coil, k ij is the coupling coefficient between the i-th and j-th receiving coils. The coupling coefficient indicates the magnetic coupling state between the coils. Usually, the coupling coefficient < 0.05 is considered decoupling. The self-inductance L of the mother AUV transmitting coil obtained by simulation is p and the self-inductance L of the AUV receiving coil si , Mutual inductance of the transceiver coil M psi , the mutual inductance M between the receiving coils sij , calculate the coupling coefficient k psi 、k ij , k psi >0.05, k ij <0.05, the transceiver coils of the parent and child AUVs are magnetically coupled, and the receiving coils of the child AUVs are decoupled from each other.

[0058] In this embodiment, if Figure 3 As shown, the energy transmission circuit structure adopts LCC-S topology, and the energy transmission frequency is ω p , V in is the input voltage, L f1 、C f1 , C1, L p They are respectively represented by the primary side compensation inductance, parallel compensation capacitor, series compensation capacitor, and coupling coil self-inductance; C 2i 、L si Respectively represent the i-th secondary side compensation capacitor and coupling coil self-inductance; M psi represents the mutual inductance between the i-th receiving coil and the transmitting coil, R Li With V out_i is the load and receiving voltage of the i-th energy receiving end, P out_i is the receiving end power, and the parameters must satisfy the following relationship:

[0059] ;

[0060] Get the output voltage V out-i , the transmission power of electric energy P out-i as follows:

[0061] .

[0062] There is no interference between the loads of each sub-AUV, that is, when the number of coils at the receiving end changes, the wireless power transmission system still has the ability to work normally, and the number of loads can be changed as required.

[0063] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A multi-load wireless power transmission system, characterized in that: The system includes: a multi-load coil coupling mechanism and a resonance compensation circuit; A multi-load coil coupling mechanism is used to perform operational tasks; The resonant compensation circuit is used to transmit power to the multi-load coil coupling mechanism; The multi-load coil coupling mechanism consists of two parts: the mother AUV transmitting coil and the daughter AUV receiving coil; The mother AUV's transmitting coil is a cylindrical solenoid coil, and the daughter AUV's receiving coil is a curved solenoid coil. The transmitting and receiving magnetic cores are placed inside the solenoids. The design method of multi-load wireless power transfer system includes: Based on actual application requirements, namely the number of sub-AUVs and transmission distance, the constraints of small mutual inductance between the receiving coils of each sub-AUV and large mutual inductance between the transceiver coils of the parent and sub-AUVs are added to design the parameters of the mother AUV's transmitting coil and the receiving coils of each sub-AUV. Electromagnetic simulation was performed in Ansys Maxwell software to obtain the self-inductance L of the mother AUV transmitting coil. p , the self-inductance L of each sub-AUV receiving coil s1 ~L si , the mutual inductance M between the transmitting and receiving coils ps1 ~M psi , the mutual inductance M between the receiving coils s(i)(j) , verify the correctness of the designed mother-child underwater vehicle wireless power transmission coupling mechanism, where i, j = 1, 2, ..., n, n is the number of sub-AUVs; Based on the electromagnetic simulation results, according to the resonance calculation formula Design the series compensation inductor L f1 , parallel compensation capacitor C f1 , series compensation capacitors C1 and C2 component parameters; Using Simiulink software, we built a circuit model of the LCC-S resonant compensation wireless power transmission system for simulation analysis to verify whether the power and efficiency of the energy transmission circuit meet the requirements. The current parameters obtained from the simulation are brought into the Maxwell electromagnetic simulation to detect whether the magnetic core is saturated. If so, the magnetic core structure is redesigned. If not, the wireless power transmission system design is completed. Electromagnetic simulation was performed in Ansys Maxwell software to obtain the self-inductance L of the mother AUV transmitting coil. p , the self-inductance L of each sub-AUV receiving coil s1 ~L si , the mutual inductance M between the transmitting and receiving coils ps1 ~M psi , the mutual inductance M between the receiving coils s(i)(j) ,The method for verifying the correctness of the designed wireless power transmission coupling mechanism of the mother-and-child underwater vehicle includes: Let k be the coupling coefficient between coils, and the relationship between the coil self-inductance and mutual inductance is as follows: Among them, k psi is the coupling coefficient between the mother AUV transmitting coil and the i-th child AUV receiving coil, k ij is the coupling coefficient between the i-th and j-th receiving coils. The coupling coefficient represents the magnetic coupling state between the coils. The coupling coefficient < 0.05 is considered decoupling. The self-inductance L of the mother AUV transmitting coil obtained by simulation is p and the self-inductance L of the AUV receiving coil si , Mutual inductance of the transceiver coil M psi , the mutual inductance M between the receiving coils sij , calculate the coupling coefficient k psi 、k ij , k psi >0.05, k ij <0.05, the transceiver coils of the parent and child AUVs are magnetically coupled, and the receiving coils of the child AUVs are decoupled from each other.

2. The system according to claim 1, wherein: The resonant compensation circuit adopts LCC-S compensation topology.

3. A method for designing a multi-load wireless power transmission system, the method being implemented by the system according to any one of claims 1 to 2, characterized in that: The method includes: the energy transmission circuit structure adopts LCC-S topology, the energy transmission frequency is ω p , V in is the input voltage, L f1 、C f1 , C1, L p They are respectively represented by the primary side compensation inductance, parallel compensation capacitor, series compensation capacitor, and coupling coil self-inductance; C 2i 、L si Respectively represent the i-th secondary side compensation capacitor and coupling coil self-inductance; M psi represents the mutual inductance between the i-th receiving coil and the transmitting coil, R Li With V out_i is the load and receiving voltage of the i-th energy receiving end, P out_i is the receiving end power, and the parameters must satisfy the following relationship: Get the output voltage V out-i , the transmission power of electric energy P out-i as follows:

4. The method according to claim 3, characterized in that There is no interference between the loads of each sub-AUV, that is, when the number of coils at the receiving end changes, the wireless power transmission system still has the ability to work normally, and the number of loads can be changed as required.

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