Wireless power transfer study using class E inverters and synchronous rectifiers

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Wireless power transfer systems are an emerging technology with the aim of completely eliminating cables forpowering electrical devices. Wireless power systems are typically limited to short distances up to 50 cm, andapplications of the technology are broad ranging from the elimination of wiring harnesses in automobile andaerospace applications to powering implanted biomedical devices. One of the main challenges in wirelesspower systems is compensating for impedance changes created by spatial variation. The compensation ofspatial impedance change is essential to obtain efficient and robust power transfer.In this research project, wireless links with class E inverters and class E synchronous rectifiers will beinvestigated. Designs for three different frequency bands (13.56 MHz, 27.12 MHz and 40.68 MHz) will beimplemented. A comparison of the power transfer over a capacitively coupled wireless link will be evaluatedfor a range of spatial variation from 10 to 40 cm. Conclusions will be made regarding the robustness of theclass E circuit topology when subjected to spatial impedance changes as well as the impact of link frequency onspatial impedance sensitivity.