Split-winding type three limb core structured HF transformer for integrating PV and energy storage(ES)

The work presented in this paper focuses on the drawbacks of three limb three winding transformer for use in three port dc-dc converter and proposes a split-winding type transformer approach using three limb core for use in three port dc-dc converter. The three limb three winding type transformer has drawback due to limitation of power flow when one port is idle and also has a very limited ZVS operating region for phase shift control. The proposed split-winding type transformer has the equivalent circuit of single core based transformer, has no limitation of power flow when one of the three port is idle and has wide ZVS range. Detailed analysis for idle condition operation, equivalent circuit derivation and ZVS operating range analysis is carried out in this paper.