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Power

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  1. Power Sajeew Shanmuganathan

  2. Outline • Derived Requirements • Power and Energy Budget • Energy Distribution • Mass Budget • System Layout • Auxiliary System • Schedule SajeewShanmuganathan

  3. Derived Requirements • The power subsystem shall: • Operate between -20⁰C to +50⁰C [TBC] • Provide average power of 2 W [TBC] • Have mass less than 1 Kg [TBC] SajeewShanmuganathan

  4. Power and Energy Budget SajeewShanmuganathan

  5. Energy Distribution Communication8% Energy distribution after penetration SajeewShanmuganathan

  6. Mass Budget • Lithium-ion cells • Higher energy density • Relatively low weight • Lithium Thionyl Chloride (LiSOCl2) • Highest energy density • Low self discharge Specific energy of lithium ion chemistry SajeewShanmuganathan

  7. Mass Budget • 5 ‘Type D’ cells required • Supplied by Saft (France) Property of LiSOCL2 cell 60 mm 33 mm Ref: http://www.saftbatteries.com SajeewShanmuganathan

  8. Subsystem Layout Switch Feedback Loop DC-DC Converter …. Battery Capacitor Load Power subsystem layout configuration SajeewShanmuganathan

  9. Auxiliary System • Thin-film lithium-ion cells incorporated for redundancy • Can be made to any shape or size and are flexible Ref: http://www.oakridgemicro.com/ SajeewShanmuganathan

  10. Auxiliary System • Advantages: • Redundancy • Require low volume • Unaffected by heating up to 280⁰C • Disadvantages: • Complexity • Not space tested • Mass SajeewShanmuganathan

  11. Schedule SajeewShanmuganathan

  12. Questions?