D08.2 - Mode Transition Analysis for Multifunctional Secondary Stage Three Port Integrated Dual Input DC-DC Converter for On-Board Charging Applications

This paper proposes a secondary-stage three-port integrated dual input DC–DC converter for on-board charging applications, designed to interface seamlessly with a half-bridge power factor correction (PFC) stage. The proposed topology possesses inherent voltage-balancing capability, effectively eliminating capacitor voltage mismatch issues in the half-bridge PFC stage. A detailed analysis of the operating modes, based on link current characteristics, is presented along with the boundary conditions governing mode transitions. The Pulse Width Modulation (PWM) control strategy for the three-port converter including power sharing capability from the input sources is proposed and validated through both simulation and experimental results, demonstrating its suitability for high-performance OBC systems.