A Method to Create More Degrees of Freedom for Designing WPT Systems—Coil Splitting
It has been proved in Chap. 4 that adding relay resonators in between the transmitter and receiver can substantially increase WPT efficiency. But in many real applications, it is not practical to insert a relay resonator in the middle of the power transfer path. The alternative way is to place the relay resonator on the same side of the transmitting coil or the receiving coil. This chapter presents a study on a WPT system with its transmitting coil split into two, i.e. forming a new transmitting coil and the relay coil. The splitting and compensation schemes are analyzed in detail. It is found that after properly splitting the transmitting coil and optimally compensating the resultant coils, the efficiency can be improved compared to that before splitting.