project center in trichy
Electric vehicles (EVs) are
becoming increasingly popular as a means of future transport for sustainable
living. However, wireless charging of EVs poses a number of challenges related
to interoperability, safety, pad misalignment etc. In particular, pad-misalignments
invariably cause changes in system parameters which in turn lead to increase in
losses as well as reduction in power throughput, making the charging process
long and inefficient. Consequently, wireless charging systems that are less
sensitive to pad-misalignments have become preferable. This paper, therefore,
presents a hybrid Wireless Power Transfer (WPT) system that charges EVs at
constant rate despite large misalignments between charging pads. The proposed
charging system uses a combination of two different resonant networks to
realize a constant and efficient charging process. A mathematical model is also
developed, showing as to how the two resonant networks can be combined to
compensate for pad-misalignments. To demonstrate the validity of the proposed
concept as well as the accuracy of the mathematical model, theoretical
performance is compared with both simulations and experimental results of a
prototype 3.3 kW hybrid bidirectional WPT system. Results clearly indicate that
the proposed hybrid WPT system is efficient and offers a constant charging
profile over a wide range of spatial (3D) pad-misalignments.
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