Design of Load-Independent Class-Φ3 Resonant Inverter
Yutaro Komiyama, Wenqi Zhu, Akihiro Konishi, Kien Nguyen, and Hiroo Sekiya
IEEE Energy Conversion Congress and Exposition (ECCE), Oct., 2024. [pdf document]

<Abstract>

This paper proposes the design of a load-independent class-Φ3 resonant inverter. The feasibility of achieving the load-independent operation in the class-Φ3 inverter is investigated through an analysis. The analysis reveals the load-independent design conditions of the class-Φ3 inverter. The load-independent class-Φ3 inverter inherently achieves zero-voltage switching (ZVS) and a constant output-voltage amplitude against load variations without any controls. Experimental verifications were carried out at 6.78 MHz with a prototype inverter. The load-independent class-Φ3 inverter achieved 87.5 %-95.9 % power-conversion efficiency within a tenfold change in the load resistance, showing the effectiveness of the proposed inverter.