Triple-Mode Wide-Input Range Resonant DC-DC Converter With Extended Asymmetric Modulation

This article proposes a triple-mode resonant converter operating over a wide input voltage range for renewable energy harvesting applications. The proposed converter operates in a pure series-resonant mode with a nominal input voltage, an asymmetric resonant boost mode with a low-input voltage, and an asymmetric pulse-width-modulation series-resonant buck mode with a high-input voltage. This converter adopts an asymmetric half-bridge-type voltage-doubler to reduce the transformer turns ratio and number of active components. Moreover, its extended asymmetric modulation reduces hard switching turn-on losses compared to conventional symmetric modulations. Consequently, the proposed converter attains high power conversion efficiency and power density over a wide input voltage range. The operating principles and steady-state analysis are presented in detail herein. Finally, a 300-W/380-V prototype is presented to validate the feasibility of the proposed converter over an input voltage range of 30-60 V.

Automated summary

This article proposes a triple-mode resonant converter that can operate over a wide input voltage range for renewable energy harvesting applications. The converter operates in different modes depending on the input voltage, allowing for efficient power conversion. The use of asymmetric modulation and an asymmetric half-bridge-type voltage-doubler contributes to higher power conversion efficiency and power density. A prototype is presented to validate the feasibility of the proposed converter.