document title / titre du document TRP W ORK PLAN ... - emits - ESA

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TRP Work Plan 2005-2007 Description of Activities TEC-SB/7935/dc 12/Feb/09 TRP Reference: Title: T604-06EP Nanotechnology for Space Solar Cells Nanotechnology could permit a new degree of freedom for solar cell design (as already for other electronic components such as lasers) due to the possibility to engineer quantum opto-electronic properties that are otherwise fixed for a given material. This project will develop ideas for new structures which use the structural design of a solar cell to tailor the absorption properties in an advantageous way, as already underway in Europe mainly for terrestrial applications and elsewhere in NASA funded projects for space].This study will consist of two phases: the first one will study of the feasibility of at least one design for incorporation of nanotechnology in solar cells for space applications, especially in relation to the technology to be developed. This is intended to involve collaboration between universities / research centers to introduce nanotechnology concepts and eg. a space cell manufacturer or other partner to contribute relevant experience of space requirements. The second phase will consist in the manufacturing and testing of demonstration devices to evaluate potential for space. Deliverables: Report on feasibility/potential benefit of nanotechnology for space photovoltaics. Demonstration model: 25 cells incorporating nanotechnology (such as quantum wells or dots, Bragg reflector layers etc.). Current TRL: TRL1 Target TRL: TRL2 Application Need/Date: TRL5 by 2012 Application/Mission: Applicability to all missions Contract Duration: 12 months SW Clause : - Dossier0 Ref.: T-7806 Consistency with Harmonisation Roadmap and Conclusions: Solar Generators & Solar Cells Page 141 of 227
TRP Work Plan 2005-2007 Description of Activities TEC-SB/7935/dc 12/Feb/09 TRP Reference: T604-07EP Efficient Low Cost Power Conversion for Standard and Advanced Fast Digital Title: Electronics In Europe, and in spite of the many development efforts performed so far, it is not possible to procure efficient, low cost converters as Off-The-Shelf (OTS) items readily available on the market and suitable for space missions. European users are therefore more and more considering the use of OTS converters from US, where market conditions exist to enable specialised companies to live on their converter products. The large commercial or military market-base of such companies allows them to propose OTS converters for space at competitive prices, when intermediate quality levels are offered (for example, class H hybrids according to MIL-PRF-38534 specification). The present activity is aimed at establishing the initial steps towards the development and qualification of a European set of efficient, low cost, readily available OTS converters for standard and advanced digital electronics. The set of converters shall cover all the required output voltage ranges for digital equipments (very low voltages for advanced technologies – 2.5V and even 1.8V - and usual 3.3V and 5V for standard technologies). A couple of power levels (5W, 15W) shall envelope the typical applications required for payload users on board of the spacecraft, and the input voltage levels will be specified to cope with the regulated or unregulated bus standards around 28V or 50V. The initial development steps (to be covered under TRP) are the following: • definition and implementation of an COTS (Commercial Off The Shelf) EEE components policy for the specific application; • converter design, manufacturing and test (at prototype level); • basic verification on key performances in environmental conditions ( radiation verification, above all). The next essential steps to ensure that the final product will be effectively available on the market is manufacturing of representative QMs, and their qualification by an adequate and thorough test campaign (to be pursued later via a GSTP or other funding). Note that this second phase is essential for the success of the initiative. Important remark: The target markets for these converters are s/c payloads and not essential platform units (like PCU, PDU, CDMU, RTU, TX, RX). For essential platform units the proposed approach is deemed still too advanced, and the use of specific converter designs, to be developed on a case by case basis with space-grade EEE parts is still the preferred option. Note that European key players do recognise the power supply and conditioning of their essential platform units as a strategic asset for ensuring overall reliability, and therefore they have specific in-house converter development capabilities. Deliverables: • Definition and implementation of an OTS EEE components policy (using COTS) for the specific converter application; • Set of converter demonstrators showing the suitability of the selected design to cover the range of application. Current TRL: TRL1 Target TRL: TRL1-2 Application Need/Date: TRL5 by 2008 Application/Mission: Applicability to all missions Contract Duration: 18 months SW Clause : - Dossier0 Ref.: T-7811 Consistency with Harmonisation Roadmap and Conclusions: Page 142 of 227
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