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Modulation strategy of dual active bridge DC-DC converter for a complete zero voltage switching operation

A dual active bridge (DAB) dc-dc converter has a limited soft-switching range and high circulating current with the conventional phase shift modulation (PSM) when a voltage variation occurs in the input/output voltage. To overcome these issues, single pulse-width modulation (SPWM) and dual pulse-width modulation (DPWM) were proposed and combined into one modulation strategy called combined pulse-width modulation (CPWM). However, this modulation strategy still operates in the hard-switching at the low power transfer with the DPWM. This paper modifies the DPWM to operate in a complete zero voltage switching (ZVS) operation. The efficiency of the modified DPWM are compared with a prototype for buck and boost operation. The experimental results demonstrate the increase in the efficiency with the modified modulation strategy by operating in the complete ZVS even if the voltage variation occurs in the input/output voltage.