A composite shielding structure suitable for electric vehicle wireless power supply system

Abstract

The invention is a composite shielding structure suitable for a wireless power supply system of an electric vehicle. The structure includes an aluminum cover, an alumina ceramic heat-conducting plate, a magnetic material shielding plate, a receiving coil and a bakelite substrate; the magnetic material shielding plate includes a shielding plate chamfer and a split plate; the split plate is made of manganese-zinc power iron Oxygen and iron-based nanocrystalline alloy two kinds of magnetic materials are spliced ​​into plate structures of various shapes. The receiving coil is set between the inner frame boundary of the bakelite substrate and the outer frame boundary of the substrate, the magnetic material shielding plate is covered on the receiving coil, the alumina ceramic heat conduction plate is covered on the magnetic material shielding plate, and the aluminum cover is covered on the oxide Above the aluminum ceramic heat conduction plate, it is fixed as a whole by screws and the Bakelite substrate. The invention not only can rationally utilize the magnetic material to shield electromagnetic radiation, but also can conduct the heat generated in the charging process to ensure the effective operation of the system.

Description

technical field [0001] The invention relates to the field of wireless power transmission of electric vehicles, in particular to a composite shielding structure suitable for wireless power supply systems of electric vehicles. Background technique [0002] Electric vehicle wireless power transmission technology is a non-contact charging technology. During the charging process, the system will generate a certain degree of electromagnetic radiation, and when the amount of electromagnetic radiation exceeds the human body safety standard, it will cause adverse effects on the human body. In order to reduce the electromagnetic radiation of the electric vehicle wireless power transmission system to ensure the safety of organisms, electromagnetic shielding design needs to be added in the process of designing the electric vehicle coupling mechanism. [0003] In the practical application of electric vehicle wireless power supply system, materials with high magnetic permeability and less...

AI Technical Summary

Problems solved by technology

However, as the output power and frequency of the electric vehicle wireless power supply system continue to increase, using a whole ferrite plate as a magnetic shielding structure can no longer meet the safety radiation standards for electromagnetic shielding

In addition, the system will generate a lot of heat during the charging process, which will affect the power transmission efficiency and shielding effect. How to dissipate heat more effectively is still a problem to be solved

[0004] The square magnetic shielding structure proposed in the literature (Wang Chaohui. Research on Electromagnetic Shielding Characteristics of Electric Vehicle Wireless Charging System) is made of PC95 manganese-zinc power ferrite material, and is completely covered above the receiving coil. This shielding method has a bulky structure. , the magnetic permeable material is not fully utilized, and the shielding effect of using a single ferrite material will affect the transmission efficiency and gradually fail to meet the development needs of future technology. In the shielding structure designed in this document, no heat dissipation device is added to conduct The heat generated during charging

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