Abstract
This paper presents a method for finding the optimum load resistance that maximizes the power efficiency of a tuned-resonant inductive power transfer (IPT) system. In this method, the equivalent AC circuit of the IPT system is transformed to match the topology of a reference ladder prototype. This simplifies the design problem, because the ladder prototype offers intuitive and accurate closed-form approximations for the optimum load resistance and maximum power efficiency. The process is graphical in the sense that manipulations and transformations are made directly on the circuit diagram. Compared to traditional circuit analysis, the ladder prototype approach does not entail complicated systems of equations or matrix manipulations. We show the utility of our method by designing a practical IPT system.
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