Modularized Bridge Rectifier (mBR) is a promising architecture of single-stage solid-state transformer. Without the presence of AC/DC active rectifier, the system performance solely depends on the control and optimization of isolated DC/DC converters. This paper presents a comprehensive analysis of DC/DC converters in mBR, covering topology selection, efficiency optimization, and design considerations. Additionally, under the specifications of 750kW and 10 kVac/760 Vdc, two existing control methods of mBR are compared with a focus on their impact on the performance of DC/DC converters.