Dynamic Optimization of Two-Coil Power-Transfer System Using L-Section Matching Network for Magnetically Coupled Intrabody Communication

Abstract

This study examined a novel intrabody communication method using magnetic coupling. For designing transceivers utilizing this communication method, it is important to understand the power-transfer characteristic between the sending and receiving coils of the transceivers and to develop a technique for maximizing the transceiver efficiency. This study targeted a two-coil wireless power-transfer system with an L-section matching network. The maximum power-transfer efficiency (PTE)—0.53—was achieved by adjusting the matching network under a carrier frequency of 2 MHz and a mutual inductance of 14.7 nH (coupling coefficient = 0.006). Additionally, by dynamically estimating the mutual inductance between the sending and receiving coils, the optimum PTE with respect to the positional relation was shown to be achievable. The proposed wireless power-transfer system is promising as a magnetic intrabody communication system.