Abstract
Due to the different application prospects, the coils of inductive power transfer (IPT) system varies. The coils on printed circuit boards (PCB) have drawn considerable attention gradually. However, the applications mainly involve portable equipment and implantable medical devices operating at a high frequency, not fit for IPT system. In this paper, an IPT system based on PCB coils were designed. All the characteristics of single turn coils on a single-layer, multi turns coils on a single-layer and multi turns coils on multi-layers of printed spiral coils (PSCs) were analysed and calculated. The self-inductance and mutual inductance of the series windings on PSCs were modeled and calculated firstly. An equivalent circuit of coils were proposed to simplify the calculation and facilitate the analysis. Furthermore, in order to increase mutual inductance and transfer more power, the multi-layer coils connecting in series were designed for the first time and the inductance parameters can be acquired by the means of proposed method. The analyses on coils model were verified by simulations using finite element method and measuring. Finally, the coil characteristics on IPT system were verified by the circuit simulation and experiment results and the designed coils can meet the desired requirements.
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