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Wireless charging using a resonant auxiliary winding

Inductive power transfer for charging of electric vehicles is rising as a viable solution for charging of electric vehicles. There is a potential for fully automatic charging of the vehicle without messing with cables, which is the case with conductive chargers. The handling is also safe without risk of injuries due to high voltage.
The inductive power transfer takes place between two coils of which one is buried in the ground and the other one is placed under the car. The distance between the coils can be relatively large which means that the leakage factor is rather high.  There is also a need for reactive power in the form of capacitors, which will be used for compensating for the big air gap, which can be as high as 15-20 cm. In order to manage the power transfer a resonant circuitry is used at relatively high frequency.
During the project several designs of inductive power transmitters shall be studied and in what way an extra coil can be beneficial for the design. The extra coil will carry the necessary reactive power for the function of the transmitter. The voltage may be chosen relatively freely in the extra coil and high voltage capacitors may be used.

The work will evaluate different designs and also investigate the use of an extra resonant winding. A high voltage capacitor may be used on the extra winding which could enhance the resulting power transfer.

Ladda ner rapporten: Wireless charging using a resonant auxiliary winding (170 kB)

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