Magnetic coupling mechanism and compensating circuit design for wireless charging of electric vehicle

Abstract

The invention discloses a magnetic coupling mechanism and compensation circuit design for wireless charging of an electric vehicle, the magnetic coupling mechanism comprises a transmitting module, a relay module and a receiving module, the transmitting module is arranged at the ground end, the receiving module is arranged at the bottom of a vehicle body, and the transmitting module and the receiving module are respectively composed of a metal shielding plate, an insulating plate, an inductance coil and a magnetic core; the relay module is arranged between the transmitting module and the receiving module and consists of an inductance coil and a magnetic core; two separated coil windings of the transmitting module, the relay module and the receiving module are spirally wound on two sides of a magnetic core; the invention further comprises a compensation topology circuit structure composed of the active relays. The transmitting side adopts an LCC compensation circuit, a relay coil compensation circuit adopts series compensation, in order to improve the system performance, a relay coil is energized, and a power supply of the relay coil is the same as an inverter power supply of a transmitting coil; and the receiving side adopts LCC compensation. According to the invention, the transmission power of the system is improved, the anti-offset capability of the system is enhanced, and the transmission distance of wireless electric energy is increased.

Description

technical field [0001] The invention relates to the technical field of wireless power transmission, in particular to a magnetic coupling mechanism and compensation circuit design for wireless charging of electric vehicles. Background technique [0002] Wireless Power Transfer (WPT) uses the principle of electromagnetic induction to transmit electric energy from the primary side to the secondary side through the air medium, with the advantages of no contact sparks, small footprint, and strong environmental adaptability. It is widely used in various fields, such as mobile phone electronics, medical equipment, electric vehicles, robots, etc. Among them, wireless charging not only reduces the size of the vehicle battery, but also has stronger flexibility in the charging process, and has a better development prospect. [0003] At present, there are still some shortcomings in the application of wireless power transmission technology to electric vehicle charging: [0004] During t...

AI Technical Summary

Problems solved by technology

Due to the large height between the tires of the car and the ground, there is a large transmission air gap in the wireless system, and the transmission power of wireless energy is further limited

[0006] Generally, the magnetic coupling capability of the coil is enhanced by increasing the size of the transmitting-receiving coil and changing its shape, but in practical applications, the size of the coil is easily limited by the surrounding environment

[0007] In order to increase the distance of wireless power transmission, relay coils are generally added on the transmitting side and the receiving side. With the increase in the number of relay coils, additional losses will be brought to the system, and it is difficult to provide high-power wireless power transmission.

[0008] In view of the above reasons, traditional magnetic coupling mechanisms and compensation topology circuits are difficult to apply wireless charging to the field of electric vehicle charging with long-distance, high offset, and high power requirements.

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