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Resonant wireless power transfer (WPT) using magneto quasi-static fields is an attractive means for delivering power in many applications. Central to the efficient delivery of power in these systems is the use of high-ratio impedance transformers to impedance-match the load to the source via the WPT network. Mini-loop transformers, which use a resonant tank for impedance matching, have become popular...
We report on an automatic impedance tuning network for mobile receivers in magnetoquasistatic wireless power transfer (WPT). We experimentally investigate a WPT system with a mobile receiver placed over a 3 × 6 spatial grid and demonstrate that the impedance change due to spatial location can be compensated through the use of two digitally tunable capacitors. We show an improved power transfer efficiency...
In this paper we report on a resonant wireless power delivery system using magnetoquasistatic fields. The system consists of a source coil impedance matched to a function generator using a resonant circuit and one or more repeater, or relay, resonant tanks that couple energy from source coil to loads distributed in the system. We experimentally map the power distribution for one and multiple loads...
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