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One of the primary requirements of dual active bridge (DAB) dc-dc converters is to operate under zero voltage switching (ZVS), to reduce switching losses and increase operating efficiency. However, three-phase DAB converters are known to have limited capability to operate in ZVS, particularly at low power levels, because of their inherent two-level six-step phase shifted square wave modulation strategy...
Unbalanced transformer impedances for three-phase dual active bridge (DAB) converters cause different zero voltage switching (ZVS) boundaries for each phase leg, which limit the converter soft switching regions. This paper uses harmonic analysis to demonstrate how asymmetrical PSSW modulation can be applied to shape each phase leg's ZVS boundary. The conclusions from the analysis provide guidelines...
One of the central requirements of a Dual Active Bridge (DAB) converter is to operate under Zero Voltage Switching (ZVS) conditions, to reduce switching losses and increase operating efficiency. This paper shows how frequency domain analysis can be used to design and operate a DAB to ensure ZVS across the entire operating range by using transformers with a reduced winding coupling factor and adaptive...
Dual Active Bridge (DAB) converters offer an unmatched capability to transfer energy in either direction between two DC sources, especially when they are operated under Zero Voltage Switching (ZVS) conditions. However, the parasitic commutation inductance within the bridge phase leg devices can still lead to significant energy losses at device turn-off despite operating under ZVS conditions. These...
For energy conversion systems that require bidirectional energy transfer between two DC sources, the generally preferred converter topology is a Dual Active Bridge (DAB), particularly when galvanic source isolation is required. However, for maximum efficiency the two bridges should operate under Zero-Voltage-Switching (ZVS) conditions, and hence it is important to be able to accurately identify this...
Dual Active Bridge (DAB) converters offer an unmatched capability to transfer energy in either direction between two DC sources, while also providing galvanic isolation and high conversion efficiency. However, to operate at high efficiencies, the bridges must operate with Zero-Voltage-Switching (ZVS) over as wide an operating range as possible. The conventional approach to determine ZVS operation...
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