Update: you can watch it my new video "20W Wireless power transfer" at:
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Wireless power transfer (WPT), wireless power transmission, wireless energy transmission (WET), or electromagnetic power transfer is the transmission of electrical energy without wires as a physical link. In a wireless power transmission system, a transmitter device, driven by electric power from a power source, generates a time-varying electromagnetic field, which transmits power across space to a receiver device, which extracts power from the field and supplies it to an electrical load.
Project presented ov video is Wireless Power Transfer between two coupled parallel LC tuned circuits, each consisting of a copper conductor loop acting as an inductor and a capacitor. Both LC circuits are tuned to equal individual resonant frequencies. Basically this is a ZVS driver circuit. I used SW3205 Mosfet, but you can use other power Mosfet such as IRF540 or IRFZ44. Transmitter loop is a copper pipe of 1cm in size. Its diameter is 18cm.
I did this kind of experiment 3 years ago and made a 40 cm distance transfer. More precisely at such a distance I managed to activate 10 watts LED diode without using wires.
This time, by fine tuning the LC circuits and by entering Passive tank circuits (passive LC - oscillators) , I managed to activate 10W LED diode at a distance of a amazing 75cm. And even more, a regular LED diode is activated at a distance of 90-100 cm. Device is powered by 12 volts DC and draw about 3A , total 36W. Scematics are presented at the end of the video, and you can also download them at the links below.

Schematics :

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and [ Ссылка ]

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by mircemk
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