A low component count high efficiency and high-power density non-isolated three-port DC-DC converter named UNIPEC is introduced for commercial trucks auxiliary power unit (APU) application. With peak efficiency of 97.3% and power density of 12.6 kW/L, proposed unit is an attractive candidate for conventional and refrigerated freight transportation applications. Power flow control logic is discussed for various integration scenarios. Comparison study with recent literature and initial low power experimental results are presented. A 1 kW lab-scale prototype is designed and is under development to validate the full system performance. Preliminary reliability analysis for lifetime estimation of the UNIPEC is also presented.
