Identification of ZVS soft switching boundaries for three-phase dual active bridge converters using harmonic analysis

While Three-Phase Dual-Active Bridge (DAB) converters are inherently capable of Zero-Voltage-Switching (ZVS), this operating region can be difficult to precisely identify for practical converter systems. This paper presents a new analytical approach based on harmonic analysis that accurately predicts the ZVS boundaries for Three-Phase DAB´s with any interconnecting impedance network under all operating conditions.