Groupe activités spatiales

1. SRA Lines SAS S3R BCC + Battery - BDC + User DC/DC Variable loads - • KEY WORDS - Satellite - Power transmission • - Data transmission - Slip Ring • - Contactless • - Power simulation • - Power electronics RETS (Robust Electrical Transfer System) & CPDT (Contactless Power and Data Transmission) • RETS (Robust Electrical Transfer System) • for Solar Array Drive Mechanism • Problematic • - Understanding of arcing phenomena in space environment • - Over voltage and over current phenomena in slip-ring arrays • Solutions • - Simulation of the equivalent circuit to understand the electric phenomena (IESE-HEIG) • - Simulation of over voltage and over current conditions (IESE-HEIG) • - Arcing conditions (CRPP-EPFL) • Advantage / Results - Knowledge of the arcing ignition conditions (CRPP-EPFL) • Optimization of the power transfer (IESE) • CPDT (Contactless Power and Data transmission) • Problematic • Power transfer with a DC-DC converter based a classical Flyback. Transformer composed by U-core ferrite. Measurement not possible on rotative side. (RUAG/IESE) • Data transfer complying with the standard MIL 1553B (IESE) • Solutions • Power : asymmetrical transformer design for 200 W and output voltage controlled by measurement of input voltage • Data : investigation ironless data transfer (IESE) • Advantage / Results • High efficiency system • Modular transformer Financial support RETS-ESA CPDT-SSO Academic partner: - CRPP-EPFL Industrial partner : - RUAG Aerospace - ESA Project duration: RETS: 2009-ongoing CPDT: 2010 Groupe activités spatiales Contacts Industry RUAG Switzerland Daniel Bommottet Head of development ch. de la Vuarpillière 29 CH - 1260 Nyon +(41) 22 361 77 33 Daniel.Bommottet@ruag.com www.ruag.com Institut d’Energie et des Systèmes Electriques (IESE) Luc Bossoney Mauro Carpita Professeurs Rte. De Cheseaux 1 CH-1400 Yverdon-les-Bains +41 (0)24 557 61 72 +41(0)24 557 63 05 luc.bossoney@heig-vd.ch mauro.carpita@heig-vd.ch iese.heig-vd.ch