Three-dimensional multidirectional inductance coil owning environmental conformal feature for wireless power transfer

Abstract

For wireless power transfer (WPT) application with multi-load or multi-repeater, the system must need some inductance coil possessing the characteristic of transmitting power to multiple directions. This paper proposes a novel three-dimensional hexagon coil with simple structure, which is fabricated conveniently and easy to conformal with surrounding environment. The formula to calculate self-and mutual-inductances for the coil are given with the direction feature also introduced. Furthermore, numerical simulations and experimental results show mutual inductance is very stable in a wide scope of direction angle, to be applied in WPT with multidirectional transmission characteristics.

A bernoulli spiral coil transmitter for charging various small electronic devices

“…As a 3D structure transmitter that can transmit power from various directions, two plane faces (butterfly-shaped) [26], three plane faces [27], four plane faces [28], five plane faces [29], and six plane faces (cube) [30] have been presented. Moreover, as a transmitter for charging multiple loads, a cylindrical transmitter that can generate a stable rotating magnetic field [31], a bowl-shaped transmitter optimized to provide a uniform omnidirectional electric field distribution [32], and an omnidirectional transmitter consisting of three orthogonal circular coils [33,34] have been presented.…”