Input Impedance Analysis for Cascaded GaN DC-DC Converter with Dead Time

Abstract

This paper presents a modified small-signal model ofGaNDC-DCconverter with dead time, which improves the accuracy of converter input impedance for Cascaded system. The reverse voltage drop and reverse conducting resistance for e-GaN HEMTs are studied in the presented small-signal model. A schematic of presented model is derived based on the state-space averaging method for GaN DC-DC Converter with dead time, which provides the modified input impedance model. The dynamic input current of synchronous Buck converter shows a 8.85% increasement in the accuracy of modified input impedance model under a step variation of source voltage. A 120-W prototype is built to verify the feasibility of the proposed high-frequency.