Groupe activités spatiales

Groupe activités spatiales

RETS (Robust Electrical Transfer System) &CPDT (Contactless Power and Data Transmission)

KEY WORDS

- Satellite- Power transmission- Data transmission- Slip Ring- Contactless- Power simulation- Power electronics

Contacts

IndustryRUAG Switzerland Daniel Bommottet Head of developmentch. de la Vuarpillière 29CH - 1260 Nyon+(41) 22 361 77 33 Daniel.Bommottet@ruag.comwww.ruag.com

Institut d’Energie et des Systèmes Electriques (IESE)Luc BossoneyMauro CarpitaProfesseursRte. De Cheseaux 1CH-1400 Yverdon-les-Bains+41 (0)24 557 61 72+41(0)24 557 63 05luc.bossoney@heig-vd.chmauro.carpita@heig-vd.chiese.heig-vd.ch

Financial supportRETS-ESACPDT-SSO

Academic partner:- CRPP-EPFLIndustrial partner :- RUAG Aerospace- ESAProject duration:RETS: 2009-ongoingCPDT: 2010

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

SRALines

+

-

SAS S3R

Battery

BCC

BDC

User DC/DC

Variable loads

+

-

Rshunt

Csnubber

Dsnubber

Rsnubber

Dout

Cout

UC1842

Differentialamplifier

+-

Sample & hold

Rload

Idealrectifier

Uin

Uout

0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.0925

30

35

40

45

50

55

60Output Voltage

t [s]

Uout

[V]

Output voltage

measurememt voltage ⋅20