Modular DCX Blocks with Autonomous Synchronization for Power Distribution Subsystem of Satellites

Abstract

This paper proposes the utilization of power electronics building blocks to standardize the power distribution subsystems in space applications. The main objective is to offer a viable strategy to expedite development with enhanced reliability, proposing an electronic-transformer-based (DCX) module. The DCX is an open-loop isolated converter that presents high efficiency and fast dynamics and enables series and parallel connections to accommodate various voltage and power requirements. The resonant full-bridge converter is studied as the DCX solution for the proposed system. Given its necessity of synchronized switching between modules, a concept of Modular Distributed Synchronization System (MDSS) is introduced. The MDDS is designed to ensure the synchronization of the switches of the modules and thus equal power sharing among connected modules, integrating redundancy and self-sustained operation, providing the flexibility needed for the DC-DC conversion. The present paper outlines the conceptual framework of the proposed system and presents a prototype for a modular Full Bridge (FB) DCX, integrated with a MDDS. The results are centered on the validating of the DCX module feasibility and in the MDSS performance in normal operation and its recovery from operational failures.