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An eit-like multi-relay wireless power transmission system and its design method

A technology of wireless energy transmission and design method, applied in circuit devices, electrical components and other directions, can solve the problems of limited energy efficiency improvement effect, difficulty in popularizing and applying multi-relay coils, and parameter design method dependence, etc., to enhance coupling strength, improve energy efficiency, The effect of improving transmission efficiency

Active Publication Date: 2022-01-07
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To solve this problem, the existing solutions are to optimize the relevant parameters for a specific relay coil structure system, so the effect of energy efficiency improvement is limited
And the corresponding parameter design method depends on the specific structural system, it is difficult to apply to any multi-relay coil structure

Method used

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  • An eit-like multi-relay wireless power transmission system and its design method
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  • An eit-like multi-relay wireless power transmission system and its design method

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Embodiment 1

[0040] This embodiment proposes a design method for an EIT-like multi-relay wireless power transmission system, including two parts: system design and parameter design.

[0041] The design of the system part is as follows: a number of cascaded relay circuits are added between the primary circuit and the secondary circuit of the wireless power transmission system, and each relay circuit is coupled with the front and rear circuits respectively to realize power transmission; Both the side circuit and the relay circuit are equivalent to RLC series resonant circuits, and an equivalent circuit model containing n RLC series resonant circuits is obtained, as shown in figure 1 shown. figure 1 In , there are n coils, and each coil is connected in series with a compensation capacitor to form a corresponding oscillation circuit, and the variable with subscript j represents the relevant electrical parameters of the jth circuit. R pj , L j and C j Represent the internal resistance, self...

Embodiment 2

[0067] In this embodiment, the three-coil system is taken as an example to analyze the conditions to be satisfied by the EIT-like magnetic coupling wireless power transfer system. The inductance matrix and capacitance matrix of the system are respectively

[0068]

[0069] Let λ=ω q 2 , substituting into formula (5) can get

[0070]

[0071] Substituting equation (12) into the above equation, we can get

[0072]

[0073] According to the EIT-like principle, let Solvable

[0074]

[0075] The eigenfrequency of the system can be obtained as

[0076]

[0077] The two formulas in the simultaneous formula (15) can be obtained

[0078] (M 12 m 23 L 1 -M 12 2 m 13 )C 1 =(M 12 m 23 L 3 -M 23 2 m 13 )C 3 (17)

[0079] Therefore, the conditions to be met by the EIT-like magnetically coupled wireless power transfer system are:

[0080]

[0081] Suppose L 1 =L 2 =L 3 , C 1 =C 2 =C 3 , substituted into Equation (18), and simplified to obtain ...

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Abstract

The invention proposes an EIT-like multi-relay wireless power transmission system and a design method thereof. The invention uses the principle of electromagnetic induction transparency in the quantum system for reference, and ensures that the system works in the eigenstate by designing parameters to realize the maximum power output. On this basis, the eigenvector of the system is designed to ensure that the element corresponding to the relay coil in the eigenvector of the system is 0, so that the relay coil can effectively enhance the coupling and consume very little energy, so as to improve the efficiency of the system while taking into account the system output power and transmission efficiency. The technical solution proposed by the invention can be applied to any system with multiple relay coil structures.

Description

technical field [0001] The invention relates to a wireless power transmission system, in particular to an EIT-like multi-relay wireless power transmission system and a design method thereof. Background technique [0002] Aiming at the contradiction between the energy efficiency and the effective energy transmission distance of the magnetic coupling wireless power transfer (MC-WPT) system, the commonly used solution is to add a relay coil between the transmitting end and the receiving end to This improves the energy efficiency and space capacity of the system. The essence of adding a relay is to increase the coupling strength between the transmitting end and the receiving end by adding a relay coil. But the relay coil itself usually adds extra loss, so the system energy consumption will be reduced accordingly. To solve this problem, the existing solutions are to optimize the relevant parameters for a specific relay coil structure system, so the effect of energy efficiency i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J50/12H02J50/50
CPCH02J50/12H02J50/50
Inventor 廖志娟冯其凯马帅吴镇夏晨阳伍小杰
Owner CHINA UNIV OF MINING & TECH