A novel wireless power driving and controlling system is proposed, which is based on the electrical driving and
controlling characteristic of liquid crystal micro-lens array with tunable focal length. The system consists of two isolated
circular copper stacked coils with circular cross section. Both of coils are air-cored. The big one, used to generate
electromagnetic field, has the wire diameter of ~1mm, and the coil diameter of ~38mm and the height of 10mm. By
contrast, the small one, used to produce electromotive force by induction effect, is ~1mm, ~13mm and ~18mm,
respectively. The varying electromotive force is generated in the small coil by the variable intensity of magnetic field
resulting from changing the time of current through the big coil. The agreement of experimental results with the
theoretical analysis proves that the electromotive force can be continuously changed from 0 to 30Vrms (root mean
square), when the duration of current through the big coil is reasonablely selected. It is very important that the clear
image can be got and the image quality of liquid crystal micro-lens array can be comparable to that of conventional
optical micro-lens array.
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