Highly-efficient power transmitter coil design for small wireless sensor nodes

摘要

We present a power transmitter coil design for millimeter-size small wireless sensor nodes to improve coupling coefficient. We also develop a wireless power transfer (WPT) system using resonant coupling to achieve higher power transfer efficiency. Simulation results demonstrated that the power transfer efficiency was 60% at z-gap = 10 mm. Compared with conventional system, coupling coefficient was improved about 2.5 times higher and the power transfer efficiency was improved by 3% when z-gap = 10 mm.