Shielding metamaterial with zero magnetic conductivity for wireless charging of electric cars

A wireless charging and electric vehicle technology, applied in the electromagnetic field, can solve the problems of high loss, unfavorable wireless coupling system simplicity and practicality, and heavy weight, and achieve the effect of strong electromagnetic shielding characteristics, shielding electromagnetic radiation, and low cost

Inactive Publication Date: 2018-06-08
HUAZHONG UNIV OF SCI & TECH +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a zero-permeability shielding metamaterial for wireless charging of electric vehicles, thereby solving the problems of traditional metal shielding materials due to their large volume, weight and high loss. Technical issues that are not conducive to the simplicity and practicality of the electric vehicle wireless coupling system

Method used

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  • Shielding metamaterial with zero magnetic conductivity for wireless charging of electric cars
  • Shielding metamaterial with zero magnetic conductivity for wireless charging of electric cars
  • Shielding metamaterial with zero magnetic conductivity for wireless charging of electric cars

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Embodiment 2

[0037] The technical parameters used in the simulation of embodiment 2 are: the copper wire width w is 1mm, the line spacing s is 1mm, the number of coil turns is 7 turns, the opening spacing g is 5mm, the substrate is an FR-4 substrate, and the dielectric constant is 4.2. The loss tangent value is 0.02, the thickness is 2mm, the size of the metamaterial is 120mm×120mm, that is, L=120mm, and the capacitance of the high-voltage in-line CBB capacitor is 1uf. The metamaterial in this specific embodiment corresponds to zero magnetic permeability around 85KHz, and the metamaterial can be produced by PCB printing technology, which is beneficial to mass production of the metamaterial at low cost.

Embodiment 3

[0038] The technical parameters used in the simulation of embodiment 3 are: the copper wire width w is 6mm, the line spacing s is 4mm, the number of coil turns is 3 turns, the opening spacing g is 20mm, the substrate is an FR-4 substrate, and the dielectric constant is 4.6. The loss tangent value is 0.02, the thickness is 2mm, the size of the metamaterial is 120mm×120mm, that is, L=120mm, and the capacitance of the high-voltage in-line CBB capacitor is 1.4uf. The metamaterial in this specific embodiment corresponds to zero magnetic permeability around 85KHz, and the metamaterial can be produced by PCB printing technology, which is beneficial to mass production of the metamaterial at low cost.

Embodiment 4

[0039]The technical parameters used in the simulation of embodiment 4 are: the copper wire width w is 1mm, the line spacing s is 4mm, the number of coil turns is 7 turns, the opening spacing g is 5mm, the substrate is an FR-4 substrate, and the dielectric constant is 4.2. The loss tangent value is 0.02, the thickness is 2mm, the size of the metamaterial is 120mm×120mm, that is, L=120mm, and the capacitance of the high-voltage in-line CBB capacitor is 1.4uf. The metamaterial in this specific embodiment corresponds to zero magnetic permeability around 85KHz, and the metamaterial can be produced by PCB printing technology, which is beneficial to mass production of the metamaterial at low cost.

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Abstract

The invention discloses a shielding metamaterial with the zero magnetic conductivity for wireless charging of electric cars. The shielding metamaterial comprises dielectric substrates, resonant capacitors and resonant structures which are attached to the medium substrates and periodically arranged, wherein the resonant structures are square open resonant rings and resonant coils connected throughmetal wires, and the resonant capacitors are welded to the back faces of the medium substrates and connected with the resonant structures. By designing and optimizing the unit geometry size, the metamaterial achieves the equivalent zero magnetic conductivity characteristic nearby the wireless power transmission work frequency. When electromagnetic waves are incident on the metamaterial with the zero magnetic conductivity, the electromagnetic waves can generate reflection, therefore, a good shielding effect is achieved on a magnetic field outside a transmission channel, and meanwhile the transmission efficiency of a wireless power transmission system is improved. The shielding metamaterial with the zero magnetic conductivity for wireless charging of the electric cars is suitable for solvingthe problem of the influences of electromagnetic radiation on human and environment in an existing concerned electric car wireless charging technology.

Description

technical field [0001] The invention belongs to the field of electromagnetics, and more specifically relates to a zero-permeability shielding metamaterial for wireless charging of electric vehicles. Background technique [0002] Metamaterials are new sub-wavelength-scale artificial composite materials with periodic or specific geometric structures. Through the ingenious design of their structures, electromagnetic waves and electromagnetic fields can be effectively regulated, breaking through the physical limits of traditional materials, so as to achieve a single natural material that cannot or is difficult. The specific electromagnetic properties achieved, such as: negative refraction, super absorption, optical stealth, etc. [0003] Since 2007, the magnetic resonance wireless power transmission technology has developed rapidly. The principle is that the magnetic field coupling resonance realizes the wireless transmission of electric energy. Uneven distribution leads to pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00H02J50/70
CPCH02J50/70H05K9/0081
Inventor 刘明海黄修涛路聪慧荣灿灿王圣明胡朝阳陶雄
Owner HUAZHONG UNIV OF SCI & TECH
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