High-Frequency Resonant Inverter for Power Transfer Between Distributed Modules of a Biomedical Implant

This paper presents a resonant inverter architecture appropriate for wired power transfer between distributed modules of a biomedical implant. The proposed inverter comprises a full-bridge inverter and two T-LCC resonant networks that help generate the required ac output voltage. It is demonstrated that this T-LCC resonant inverter topology can maintain near-constant output voltage across a wide load range without closed-loop control. The proposed inverter can also achieve high efficiency by minimizing circulating currents and maintaining soft-switching across a wide load range. A 130-mW, 1-MHz prototype T-LCC resonant inverter achieves a full-power efficiency of 86% and maintains efficiency above 80% across a two-to-one power range.