PAGE CONTENTS
Objectives
The aim of the medium & high power EPC program is to answer to high power SSPA needs in terms of power supply covering a wide range of output voltages (typically from 8 to 60V on main rail) with two possible primary buses at 50V and 100V.
Benefits
The expected benefits are to answer the expectations of innovative equipment to be used in the near future for telecommunication applications with a market target cost product.
Features
The features of the product are :
- Input Bus voltage should be compatible with both 50V and 100V regulated
- Output power should be up to a140W for medium power and 250W for high power
- Efficiency > 90%
- Output ripple on main rail < 5mV rms
- Sequencing requirements have to be met between auxiliary rails and main rail
- Mass lower than 570 g
- Interface temperature > 70°C at EPC feet
The two modules uses the same architecture described in the following block diagram:
Challenges
The challenge was to have a single product developed, with different options depending on input/output characteristics using the same technologies, the same electrical architecture, the same electronic design modules, a common definition and justification file, the same PCB, and a maximum of common EEE parts.
Plan
The development plan was based on 4 work packages :
- Generic design specification, covering both GaAs SSPA and GaN SSPA’s
- Preliminary design with 2 EM manufacturing : 1 EPC for GaAs SSPA, 1 EPC for GaN SSPA.
- Technological qualification
- Final design and 1 EPC EQM manufacturing for GaN SSPA with Qualification
Current Status
The project takes benefit from the experience already acquired by Airbus D&S through development of DC/DC for Inmarsat I-XL payload and of EPC for SSPA (Solid State Power Amplifier) for the export market (20W RF power).
The two EM EPC have been characterized: one medium power and one high power. Both embed new parts for which qualifications have been made.
An EPC HP EQM has passed a qualification campaign.
