Resonant Multiport Converter with High Interconnection Capability and Lower Parameter Deviations

Abstract:
DC/DC converters for high-current applications have an important role in onboard systems in electric vehicles (EVs). The converter has to achieve high power density and high efficiency for minimizing weight, maximizing range operation, and saving space in EVs. Further, the interconnection of multiple energy sources becomes crucial in this system for supporting the load at different operation points. Parameter deviations from the transformer and resonant elements can impact the operation of resonant multiport converters by increasing the uneven power flow among the ports and reducing efficiency. Thus, this paper investigates an isolated multiport topology with a reduced number of reactive elements and a planar multiwinding transformer (MWT) to achieve a low parameter deviation and hence balance the power processing in each port of the converter. The causes and effects of this parameter deviation are discussed and the effectiveness of the DC/DC Converter is validated with a prototype.