PAGE CONTENTS
Objectives
The project concerns the development and qualification of two modules of the Payload Distribution and/or Interface Units. This development will increase the range of potential Platforms that can implement this unit and will avoid problems with export restrictions (ITAR free design).
The two modules are:
RT1553 module: This module forms the interface between the 1553 external bus and the internal OBDH bus.
CVIU module: This power supply module needs to be redeveloped in order to cover the full range of potential MAIN BUS voltages (28V, 50V, 100V) with ITAR free solution.
The objective of the project is to develop and qualify two RDIU/PLIU/PLDIU modules that allow covering a larger range of telecommunication platforms by increasing the range of Primary Power Bus voltages. In addition, export restrictions are avoided by implementing ITAR free solutions.
Two modules are concerned:
- CVIU module: This module provides the internal supply voltages of the complete unit. It needs to be redeveloped in order to cover the full range of potential MAIN BUS voltages (28V non regulated, 50V, 100V) with ITAR free solution.
- RT1553 module: This module forms the interface between the 1553 external bus and the internal OBDH bus. It needs evolution to become ITAR free and replace obsolete EEE parts.
Two RT1553 modules (Nominal and Redundant) together with two CVIU modules (Nominal and Redundant) constitute the centralized management core of Power Distribution and Interface Units for export telecommunication payloads.
The main activity consists in the design, development and qualification of these two modules.
RT1553 module  click for larger image |
CVIU module click for larger image |
Challenges
The key issues in this project are:
- Increase main power bus application range up to 100V,
- Documentation including PLIU equipment documentation (for topics related to module), CVIU and RT1553 module documentation,
- EM of CVIU (50V) and RT1553 module,
- Testing and reporting at CVIU and RT1553 module level,
- Qualification testing and reporting at unit level.
Plan
The development activities are:
- Design, development and documentation of the new CVIU and RT1553 boards including 50V and 100V version for CVIU.
- CVIU (only 50V version) and RT1553 EM boards manufacturing and electrical validation testing including complete electrical tests at ambient, hot and cold temperatures and emission and susceptibility conducted EMC tests on Main Power Bus for CVIU.
- Qualification of the new modules on a complete PLIU PFM.
- This approach of qualification on the first PFM is acceptable due to the large reuse of existing modules for the other RDIU functions and because of the complete CVIU and RT1553 electrical validation on a representative EM.
- The qualification test sequence that will be performed on this PFM includes vibrations, thermal vacuum tests and EMC emission and susceptibility tests on Main Bus.
Current Status
CVIU Module:
- Design and development of the module are completed,
- Manufacturing files are completed,
- EM board tests are completed,
- FM board tests are completed.
RT1553 Module:
- Design and development of the module are completed,
- Manufacturing files are completed,
- EM board tests are completed,
- FM board tests are completed.
CVIU and RT1553 FM modules have been integrated in an equipment (PLIU) and successfully qualified in a PLIU PFM during the 1st quarter of 2011.