High-Power-Density, Rad-hard, SiC Based, Intelligent Multi Module DC/DC Converter PMAD System For Optimal Energy Utilization

Increasing power density and efficiency, reducing size and weight, and introducing standardization of electronics systems are all goals of the STSS program. The performance of Power Management and Distribution (PMAD) systems has great impact on the energy storage systems of the spacecraft or satellite. APEI, Inc proposes to develop rad-hard SiC based modular DC/DC converter PMAD systems. The modular rad-hard SiC PMAD concept will enable seamless scalability and power sharing among modules for space applications. It will also allow the electrical removal of a failed module to provide uninterrupted power. APEI’s proposed modular converter technology is also the gateway to two advanced optimal energy utilization techniques: 1) Battery run-time extension—Battery capacity decreases with increasing discharge load current. By using the modular PMADs, the current load can be distributed among different batteries (from the existing redundant systems), which increases the amount of the maximum nominal capacity utilized. 2) Maximum efficiency tracking—The efficiency of a typical converter diminishes as the power demand decreases; thus, relegating the operation of the converter to a low-efficiency point for low power demands. APEI’s proposed modular PMAD technology will dynamically tailor the number of “active/inactive” modular PMADs to the existing power demands in order to always operate at maximum efficiency.