Strong coupled magnetic resonance has been convinced to be a new and efficient wireless power transfer way by the previous work conducted by MIT and Intel researchers. It offers the promise for automobile electric vehicles and mobile consumer electronic devices to be wireless charged efficiently and safely. For the first time, a wireless charger prototype based on this technology is presented in this paper. Schematics and design considerations are also discussed. Experimental results show that this prototype can wirelessly charge a NOKIA cell phone over a distance 40cm with an input power of less than 4 watt, and has an efficiency of 52% over a 32cm distance.
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