A new design of wireless power transfer system using hellical resonators applicapable to multi-channel power transmission

Wireless power transfer (WPT) technology via electromagnetic resonant coupling shows the probability of removing wires. Many researches have been published and have shown promising results. However, there were few studies to use a helical resonator for wireless power transfer, though it has great benefits of low resonant frequency and simple configuration. We present a new approach to design a wireless power transfer system using helical coil (transmitter) and LC resonant coil (receiver). The proposed system was optimized at self-resonant frequency of 3.4MHz and transmission parameters were measured by a vector network analyzer. We achieved that a minimum efficiency is about 40% when the transmitter-to-receiver distance is 1m. It was also shown that the transmit coil with helical resonator can be easily expanded to multi-channel wireless power transmitters.