Abstract:
This paper depicts the design, implementation and analysis of efficient resonant based
wireless power transfer (WPT) technique using three magnetic coupled coils. This work is suitable for
mid ranged device due to small form factor while minimizing the loading effect. A multi turned loop
size resonator is exploited for both the transmitter and receiver for longer distance. In this paper, class-
E power amplifier (class-E PA) is introduced with an optimum power tracking mechanism of WPT
system to enhance the power capability at mid-range with a flat gain. A robust method of finding
optimum distance is derived with an experimental analysis of the designed system. In this method, the
load sensitive issue of WPT is resolved by tuning coupling coefficient at considerable distances. Our
designed PA with a drain efficiency of 77.8% for a maximum output of 5W is used with adopted
tuning technique that improves the overall WPT system performance by 3 dB at various operating
points.
