Wireless power charging system for mobile device based on magnetic resonance coupling

In this paper, the development wireless power charging system for mobile device based on magnetic resonance coupling is proposed. The system is comprised of three parts; a transmitter circuit to generate the AC signal to be transferred, transmitting and receiving radiators to transfer the power of AC signal wirelessly, and a receiver circuit to convert the received AC signal into DC voltage for charging the mobile device. The system is designed to work at frequency of 10MHz empowered by an Op-Amp AD8067ART at the transmitter to produce the AC signal. The radiators for transmitting and receiving 10MHz AC signal are implemented using microstrip line which is separated each other by narrow space to obtain the optimum coupling. Whilst the receiver is constructed of a simple voltage doubler circuit which also works as a rectifier. From the experimental characterization, it is demonstrated that the wireless power charging system with 0.8mm distance of radiators is able to produce 4.08V DC at the output of receiver circuit chargeable a battery of mobile phone in which this voltage is equivalent to 12.2VPP AC signal at the transmitter circuit.