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The main objective of this activity was to study the B3R converter [1] and to confirm its flexibility and performance (mainly efficiency and mass reduction) versus solutions that is implemented in a satellite PCU. For details see [2] ESTEC SOW. An architecture with centralised regulated bus, single battery and centralised solar array was selected for this study. Project Plan: - Study, design and development of an evaluation prototype, based on the B3R topology (including protections and control loops). - Study, design and development of an Electrical Elegant Breadboard including three power stages, based on the B3R topology (including protections and control loops). - Laboratory tests of these converters (power stages, control loops and protections). - Conclude the study by comparing the achieved performances (including efficiency and mass) versus current solutions implemented on a satellite PCU. Summary of the pros and cons of the use of the B3R concept.