Investigation into Wireless Power Transfer in near Field using Induction Technique

Abstract

Wireless Power Transfer (WPT) enables transfer of electric power from the source to electrical load(s) in the absence of any physical link. This mode of transmission is favourable especially when it is not feasible or convenient to connect wires together. In WPT, the most important parameter is the efficiency, where the energy transmitted by the ‘plant’ is obtained by the receiver, thereby defining the economic importance of such system. This study is aimed at showing how electrical energy can be transferred on a near field basis using induction. In order to achieve this aim, the transmitter converts the DC source from an oscillator, with the high frequency AC, which is linked with the wireless power transmitting coil. The experiment showed how electricity can be transmitted at certain distances from a resonating coil. The project showed that the mutual inductance of two coupled coils resonating at a considerably high frequency is proportional to the power output of the systems. It was observed that inductors wrapped around an iron core placed on the same axis to each other with 56 turns of copper wire resulted in a more efficient power transfer and a higher power output than when inductors placed at different axis to each. An instantaneous increase in voltage was also measured while power was gradually built up in the resonating coil. This project can be applied in the industry for the generation transmission of power without conducting cables.