Design and analysis of resonant inverter for a wide range of input voltage

This paper proposes a resonant inverter topology for a wide range of input voltage. It has a higher power density compared to two-stage system, because it utilizes the same passive components as a conventional Class-E inverter and even with a smaller input inductance. The steady-state analysis for maintaining a constant power while satisfying soft-switching conditions such as zero-voltage switching (ZVS) and zero-derivative switching (ZDS) is conducted. Experimental results from a 24W, 12V-48V input voltage, 3-MHz GaN-based prototype verify the feasibility and the effectiveness of the proposed circuit topology. The peak efficiency of the prototype reaches 96.4% at the lowest input voltage.