Design and Implementation of On-board Electrical Power ... - OUFTI-1

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8.1.2 DesignA model of Li-Po battery from KOKAM was selected. Batteries are delivered with a batteryprotection circuit, which we will use. The solar cells are the new 30% efficiency solar cellsfrom Azurspace.The dissipation system, the battery heater, the three DC/DC converters, the input filtersof the converters, the antenna deployment system, and the protection circuit were completelydesigned as part of our work (electrical schematics and components selection).The design procedures were explained in detail to make the development of our futureCubeSats easier.8.1.3 Implementation and testsBreadboard prototypes of the dissipation system and the protection circuit were made andtested (tests are reported in [1]). (The breadboard prototype of the converters and the firstdissipation systemm were made by Philippe Ledent.)The engineering model of the EPS electronic card was made. The PCB routing andmanufacturing were made by Deltatec, our subcontractor. The engineering model includesthe dissipation system, the three DC/DC converters, the input filters of the converters, theantenna deployment system, the measurement system (designed in [10]), and the protectioncircuit for the measurement system. The circuits of the engineering model were tested withoutthe batteries and solar panels, with a temperature range of -30 ◦ C to 70 ◦ C (tests are reportedin [1]).8.2 Future workThis is a non-exhaustive list of work that remains to be done.• Improve the design of the 7.2V converter to upgrade the frequency stability of theconverter (optional).• Measure the I-V curve of the solar panels and compare the result with the Matalabmodel.• Make the engineering model of the batteries electronic card.• Test the batteries heater.• Test the protection circuit module (PCM).• Test the complete engineering model.• Test the compatibility between the EPS and the EPS2 when connecting the 3.3V outputstogether.• Test the EPS with all other subsystems, both in the laboratory and in appropriateenvironmental conditions.100
Bibliography[1] Pierre Thirion, Test of prototypes of the EPS of student nanosatellite OUFTI-1, InternshipReport, University of Liège, Liège, Belgium, 2009.[2] Philippe Ledent, Design and Implementation of On-board Digitally Controlled ElectricalPower Supply of Student Nanosatellite OUFTI-1 of University of Liege, Master’s Thesis,University of Liège, Liège, Belgium, 2009.[3] Philippe Ledent, Architecture et design de l’EPS de OUFTI-1, Internship Report, Universityof Liege, Liège, Belgium, 2009.[4] Stephania Galli, Mission Design for the CubeSat OUFTI-1, Master’s Thesis, Universityof Liège, Liège, Belgium, 2008.[5] Gauthier Pierlot, Oufti-1: structural integrity, system configuration and vibration testing.,Master’s Thesis, University of Liège, Liège, Belgium, 2009.[6] Vincent Beukelaers, From mission analysis to space flight simulation of the OUFTI-1nano-satellite, Master’s Thesis, University of Liège, Liège, Belgium, 2009.[7] Lionel Jacques, Thermal Design of the OUFTI-1 nanosatellite, Master’s Thesis, Universityof Liège, Liège, Belgium, 2009.[8] François Mahy, Design and Implementation of On-board Telecommunication System ofStudent Nanosatellite OUFTI-1 of University of Liège, Master’s Thesis, University ofLiège, Liège, Belgium, 2009.[9] Damien Teney, Design and Implementation of On-Board Computer of Student NanosatelliteOUFTI-1 of University of Liège, Master’s Thesis, University of Liège, Liège, Belgium,2009.[10] Nicolas Evrard, Développement de l’infrastructure de mesure du nanosatellite OUFTI-1.,Master’s Thesis, Liege: Hemes-Gramme Institute, Academic year 2008-2009.[11] Cal Poly State University, Cubesat Community Website, http://cubesat.atl.calpoly.edu/,consulted in may 2009.[12] Cal Poly State University, CubeSat Design Specification, Revision 11, 11/02/2008.[13] Ryan Connoly, ”The P-POD Payload Planner’s Guide”, 2000[14] Edouard Perez, VEGA launch vehicle User’s Manual, ARIANESPACE, March, 2006.101
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AcknowledgementsI want to thank the
Page 4 and 5:
Contents1 Introduction 91.1 Cubesat
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4.4.2 Mean case . . . . . . . . . .
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B Power budget worksheet 106C Pictu
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design and the tests are delegated
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Chapter 2Requirements of the EPS2.1
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• The Single-Event Upset (SEU)Thi
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the P-POD. RBF pins must fit within
Page 18 and 19:
Figure 2.6: Top view of the PC104 c
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Chapter 3Design of EPS architecture
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• Voltage (4) and current (5) at
Page 24 and 25:
Figure 3.6: The equivalent circuit
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of our Lithium-Polymer batteries va
Page 28 and 29:
Figure 3.12: I-V curve of a solar p
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3.3.3 CapacityA important value to
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Parameter SLPB723870H4 SLPB554374HN
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of the batteries is kept between -2
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Over Charge Prohibition 4.275 ± 0.
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supplied in 5V. The circuit will be
Page 40 and 41:
Chapter 4The Power Budget4.1 Introd
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Figure 4.1: P-V curve of a solar pa
Page 44 and 45:
4.3.2 Efficiency of convertersTo at
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Figure 4.3: Consumptions in % in me
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Chapter 5Electrical Design of EPS5.
Page 50 and 51: V outV in= D. (5.1)Since D ≤ 1, t
Page 52 and 53: The power losses in the inductor ar
Page 54 and 55: ∆i L,1 + ∆i L,2 = 0, (5.16)V in
Page 56 and 57: Using the value of ∆i L given by
Page 58 and 59: There is no data about the case to
Page 60 and 61: Capacitor selectionFour 10µF ceram
Page 62 and 63: • Output voltage: 5V.• Maximum
Page 64 and 65: Figure 5.12: Burst mode operation (
Page 66 and 67: Figure 5.14: Simplified schematics
Page 68 and 69: Figure 5.15: Worksheet for 3.3V con
Page 70 and 71: sequently, the k was chosen above 0
Page 72 and 73: where G 1 is the initial control-to
Page 74 and 75: Figure 5.21: Measured Bode diagram
Page 76 and 77: Figure 5.26: Equivalence between th
Page 78 and 79: C f =12πf f R 0f,L f = R 2 0f C f
Page 80 and 81: Figure 5.37: Schematics of the firs
Page 82 and 83: R KR >1.45V100mA − 1.3A35= 23.07
Page 84 and 85: The schematics is shown on figure 5
Page 86 and 87: A commercial model meets all requir
Page 88 and 89: Figure 5.45: Schematics of the heat
Page 90 and 91: PrefixX7X5Y5Z5SuffixTemperature ran
Page 92 and 93: 6.2.1 The second dissipation system
Page 94 and 95: • The antenna deployment system.
Page 96 and 97: 6.3.3 TestsThe engineering model of
Page 98 and 99: 7.3 ActivitiesAs OUFTI-1 is designe
Page 102 and 103: [15] Fabien Jordan, Phase B Electri
Page 104 and 105: TaK = 273 + TaC;%Photo-current ther
Page 106 and 107: Appendix BPower budget worksheetIn
Page 108 and 109: 108
Page 110 and 111: Appendix CPictures of the prototype
Page 112 and 113: Appendix DSchematics of the enginee
Page 114 and 115: 876543213V3 CONVERTER AND INPUT FIL
Page 116: 87654321ANTENNA DEPLOYMENT CIRCUITB
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