SRU @BUS

Objectives

More than ever, the telecom Geo satellites industry is facing a highly competitive market, where the technical and cost performances have to be improved constantly.

The existing Alcatel ETCA PCU products (dedicated to the Alcatel SPACEBUS platforms) are the SPACEBUS 3000 PCU (from 2kW to 5.4 kW at 50V) and SPACEBUS 4000 PCU (from6kW to 21 kW at 100V). However, in its low end (from 6 to 15kW), the SB4000-PCU is not optimised due to the impact of the non-modular functions which are dimensioned for the full power (connections, battery charger, bus capacitor and the solar array regulation module).

In the frame of the common Alcatel-Astrium @BUS platform, a new generation of PCU shall be developed in order to improve its competitiveness in terms of mass, efficiency, power modularity and above all cost. Optimisation shall be performed in the nominal @Bus power range (13 to 19 kW), but extension from 8 to 26 kW shall be analysed. In addition, retrofit to the present Alcatel platform (SB4000) and Astrium platform (EUROSTAR 3000) shall be also investigated as far as possible.

The design and development of the SRU will be based on the SB4-PCU experience, but with important upgrades (design to cost activity mainly based on the design rules simplification, new generation of power components, topologies review, update of the environment constraints., & ) in order to meet the following objectives:

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• Improvement of the Conductance Susceptibility bus performances (including higher TDMA load modulation)

• Compatibility with the new mult

Challenges

Not Applicable.

Plan

Not Applicable.

Current Status

The predevelopment has been completed by the Architecture Review held end of June 2004.