A loosely coupled transformer device for wireless charging of electric vehicles

Abstract

The invention discloses a loosely coupled transformer device for wirelessly charging an electric vehicle. The device comprises an emission module, a reception module and two shielding cover plates, wherein the emission module and the reception module are coupled to each other. According to the technical scheme of the invention, the magnetic leakage at the back of a transformer can be well shielded by the shielding cover plates. Meanwhile, a magnetic conductive core structure is arranged in each shielding cover plate, so that the flow direction of the magnetic leakage at the back of the transformer can be guided by the magnetic conductive core structure. The coupling coefficient of primary and secondary sides is increased. Meanwhile, the loss of the cover plates is reduced and the efficiency of the whole device is improved. At the same time, a plurality of strands of litz wires are connected in parallel to form a coil, so that the coil loss of the transformer is reduced. A strip-shaped magnetic core reduces the weight of the transformer and increases the coupling coefficient of primary and secondary sides. By means of an insulating plate, the magnetic core and the coil can be conveniently fixed. Therefore, the above transformer device is good in shielding performance, simple, firm, high in coupling coefficient of primary and secondary sides, and high in overall efficiency. As a result, the device is very suitable for the wireless charging of electric vehicles.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle wireless charging, and in particular relates to a loose coupling transformer device used for electric vehicle wireless charging. Background technique [0002] Currently on the market, the charging method of electric vehicles mainly adopts the contact type, that is, the charging equipment is directly contacted with the electric vehicle for charging by using wires. The use of contact charging mainly has the characteristics of low safety performance, inconvenient operation, and poor adaptability to the environment, while the use of wireless charging can overcome the problems of contact charging. Since wireless charging technology does not require physical wire connection, it has a higher safety factor than ordinary contact charging systems, and is more suitable for harsh charging environments, such as mine operations, rainy and snowy weather, etc. Electric vehicles have better application p...

AI Technical Summary

Problems solved by technology

Because the metal plate has a shielding effect on the electromagnetic field, it can weaken most electromagnetic radiation problems. However, when the wireless charging system is working, there is an eddy current in the metal plate, so the loss is large, and the main function of the metal plate is to offset the magnetic flux leakage on the back, so In general, the use of back magnetic flux leakage is not considered, resulting in poor performance of the entire transformer

Because the magnetic flux leakage on the back is an important part of the entire magnetic field distribution, if it is only absorbed by the metal plate device, the overall coupling performance will be reduced, and the radiation problem is relatively serious

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