Resonant Circuits and Soft Switching Application Note 2019-11-12 1 © 2019 Toshiba Electronic Devices & Storage Corporation Outline: This document discusses the principles of resonant circuits and soft switching and describes application examples of LLC resonant converters and resonant inverters (an inductive-heating circuit and a discharge tube drive). Resonant Circuits and Soft Switching (LLC Resonant Converter and Resonant Inverter)