A Compact Wireless Charger Design with Decoupled Quadruple-D Inductor for LCC-Series Topologies

Abstract

For inductive power transfer (IPT), inductor¬capacitor-capacitor-series (LCC-S) compensation network is one of the most prevalent topologies. In LCC-S IPT, by performing inductor integration, which integrates the input inductor to the primary-side coil, the system can become more compact. Nonetheless, one drawback of inductor integration is that the mutual coupling between the input inductor and the IPT coils can degrade system efficiency and output, especially under misaligned conditions. This paper purposes a decoupled quadruple-D inductor design that achieves inductor integration while has negligible coupling to the IPT coils within the whole operating region. A 1kW LCC-series compensated IPT prototype with the purposed inductor design has been developed, and the experimental results verify that the purposed design has almost identical electrical performance as conventional stand-alone inductors, while requiring no additional space.