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Orbital Transfer Vehicle (OTV) Power Systems

Orbital Transfer Vehicle (OTV) Power Systems. Ian Meginnis February 12, 2009 Group Leader - Power Systems Phase Leader - Translunar Injection. OTV Solar Arrays. Two, circular Ultraflex solar arrays from Able Engineering Based on 2kW power needs: Total Deployed Area = 6.67m 2

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Orbital Transfer Vehicle (OTV) Power Systems

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  1. Orbital Transfer Vehicle (OTV) Power Systems Ian Meginnis February 12, 2009 Group Leader - Power Systems Phase Leader - Translunar Injection Ian Meginnis Power Systems

  2. OTV Solar Arrays Ian Meginnis Power Systems • Two, circular Ultraflex solar arrays from Able Engineering • Based on 2kW power needs: • Total Deployed Area = 6.67m2 • Total Stowed Volume = 0.068m3 • Total Mass = 13.3kg • Total Cost = $2 million • Structural Requirements • Stowed Maximum Acceleration: 25g normal; 30g lateral • Deployed Maximum Acceleration: 0.1g (all axes) • Lunar lander batteries can support 2kW of OTV operations for up to 50mins during periods of darkness

  3. OTV Power Configuration Solar Array <200V Solar Array Acronym Definitions: PCDU - Power Conditioning and Distribution Unit PPU - Power Processing Unit LL - Lunar Lander DC - Direct Current Note: Not to scale Ian Meginnis Power Systems Battery (LL) DC-DC Converters Individual OTV Components PCDU 100V 100V PPU (Electric Propulsion)

  4. Backup Slide Ian Meginnis Power Systems • Calculation of Solar Array Dimensions • Solar Array Mass: • Total Power Consumption: 2kW • Solar Array Power Density: 150W/kg • 2000W / 150W/kg = 13.3kg • Solar Array Storage Volume: • Thickness: 0.102m • Height: 0.326m • Radius: 1.03m • 0.102m x 0.326m x 1.03m = 0.0342m3 • Solar Array Cost: • Cost/Watt: $1000/W • 2000W x $1000/W = $2 million

  5. Backup Slide (cont.) Ian Meginnis Power Systems • PCDU Specifications • Terma Power Management and Distribution System • Power Capacity: 2kW • Voltage Output: 100V • Mass: 14kg • Volume: 0.0247m3

  6. Backup Slide (cont.) Ian Meginnis Power Systems • DC-DC Converter Information • 100 VDC Input Spacecraft Bus, Radiation Hardened • Produced by Modular Devices Incorporated • Available power output: 6.5W-80W • Various output voltages available • Separate DC-DC converter used for each device • All converters integrated into single-box design

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