A Design Technique for Optimizing Resonant Coils and the Energy Transfer of Inductive Links

Power transfer efficiency (PTE) is a key performance parameter in development work on resonant inductive power (IPT) systems. Geometrically optimizing the transmitter (Tx) and receiver (Rx) coil pair way of improving IPT system's efficiency. In this article, new figure-of-merit (FoM) proposed to find an optimum geometry which maximizes PTE. The employed FoM parameter, called “strong coupling factor” (P scf ), defined such that its value indicates how strongly Tx Rx coils are linked together. Considering application physical size constraints, proper selection method for identifying numerical P essential optimal design. This article presents iterative algorithm assist most favorable provides maximized PTE designed geometry. Design examples two nominal systems at frequencies 415 0.1 MHz used investigate design algorithm. Theoretical calculations show system operating MHz, with coefficient (K) 0.2, can achieve maximum 85.70%. Measurements presented from practical Tx/Rx link K = 0.05, 83.10% against calculated 84.11% validating process.