A novel resonant inductive magnetic coupling wireless charger with TiO2 compound interlayer

A nonradiative energy transformer exploiting TiO2 nano-powder and (C4H6O2)(x) latex as a combined interlayer is proposed. The transformer works on 'strong coupling' between two coils (i.e., resonators), which are physically separated from each other by distances that are longer than the characteristic sizes of each resonator, to realize efficient wireless energy transfer. Nonradiative energy transfer between the two resonators is facilitated through the coupling of their resonant-field evanescent tails. Finite element analysis and experiments have been carried out to facilitate quantitative comparison. The efficiency of the proposed system is 70.6% at 5 cm and 26.3% at 15 cm at an operating frequency of 1.74 MHz. When compared with typical magnetic inductive coupling energy transmission devices with low dielectric constants, the efficiency of the proposed system is much higher. (C) 2011 American Institute of Physics. [doi:10.1063/1.3536558]