A Novel Coil for Wireless Power Transfer System

Wireless power transfer (WPT) technology is now widely used because it's safe, convenient and efficient. The performance of the WPT system is largely determined by the coupling between the transmitter coil and the receiver coil. This paper proposed a novel coil that concludes a main coil and two auxiliary coils and the three coils are electrically connected in series with one another. The design parameters of the proposed coil and its effects are analyzed. Results show that, with properly chosen design parameters, the proposed coil could not only reduce the electromagnetic field (EMF) formed in a location away from the coils but also prevent or minimize a reduction in power transmission efficiency.