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

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Contents1 Introduction 91.1 Cubesat Concept . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91.2 Mission Objectives of OUFTI-1 . . . . . . . . . . . . . . . . . . . . . . . . . . 91.2.1 D-STAR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101.2.2 The Experimental Electrical Power System (EPS2 . . . . . . . . . . . 101.2.3 New generation solar cells . . . . . . . . . . . . . . . . . . . . . . . . . 101.3 Role of Electrical Power System . . . . . . . . . . . . . . . . . . . . . . . . . 102 Requirements of the EPS 122.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122.2 Constraints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132.2.1 Space Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132.2.2 Launch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152.2.3 Mechanical architecture of OUFTI-1 . . . . . . . . . . . . . . . . . . . 162.3 Functionalities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172.3.1 Power source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172.3.2 Power storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172.3.3 Power conditionning . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182.3.4 Housekeeping parameters . . . . . . . . . . . . . . . . . . . . . . . . . 192.3.5 Antennas Deployment System . . . . . . . . . . . . . . . . . . . . . . . 193 Design of EPS architecture 203.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203.2 Solar Cells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203.2.1 Theory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203.2.2 Azurspace’s solar cells . . . . . . . . . . . . . . . . . . . . . . . . . . . 224
3.2.3 Simple model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233.2.4 Matlab model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243.2.5 Solar panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253.3 Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293.3.1 Technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293.3.2 Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293.3.3 Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303.3.4 Redundancy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 313.3.5 KOKAM batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 313.4 Battery protection circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 343.4.1 Electrical characteristic . . . . . . . . . . . . . . . . . . . . . . . . . . 343.4.2 Over charge protection (i.e. over-voltage protection) . . . . . . . . . . 353.4.3 Over discharge protection (i.e. under-voltage protection) . . . . . . . . 353.4.4 Over current protection . . . . . . . . . . . . . . . . . . . . . . . . . . 353.5 Dissipation system (Shunt regulator) . . . . . . . . . . . . . . . . . . . . . . . 363.6 Battery heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 363.6.1 Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 363.6.2 Supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 373.7 USB battery charger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 373.8 Power conditioning unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 383.9 Protection circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 383.10 Measurement system (Housekeeping parameters measurements) . . . . . . . . 383.11 Antennas deployment circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . 393.12 About the experimental EPS . . . . . . . . . . . . . . . . . . . . . . . . . . . 394 The Power Budget 404.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 404.2 Estimation of input power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 404.3 Estimation of consumed power . . . . . . . . . . . . . . . . . . . . . . . . . . 414.3.1 Operation modes of subsystems and corresponding power needs . . . . 424.3.2 Efficiency of converters . . . . . . . . . . . . . . . . . . . . . . . . . . . 444.4 Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 444.4.1 Cold case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Page 2 and 3: AcknowledgementsI want to thank the
Page 6 and 7: 4.4.2 Mean case . . . . . . . . . .
Page 8 and 9: B Power budget worksheet 106C Pictu
Page 10 and 11: design and the tests are delegated
Page 12 and 13: Chapter 2Requirements of the EPS2.1
Page 14 and 15: • The Single-Event Upset (SEU)Thi
Page 16 and 17: the P-POD. RBF pins must fit within
Page 18 and 19: Figure 2.6: Top view of the PC104 c
Page 20 and 21: Chapter 3Design of EPS architecture
Page 22 and 23: • Voltage (4) and current (5) at
Page 24 and 25: Figure 3.6: The equivalent circuit
Page 26 and 27: of our Lithium-Polymer batteries va
Page 28 and 29: Figure 3.12: I-V curve of a solar p
Page 30 and 31: 3.3.3 CapacityA important value to
Page 32 and 33: Parameter SLPB723870H4 SLPB554374HN
Page 34 and 35: of the batteries is kept between -2
Page 36 and 37: Over Charge Prohibition 4.275 ± 0.
Page 38 and 39: supplied in 5V. The circuit will be
Page 40 and 41: Chapter 4The Power Budget4.1 Introd
Page 42 and 43: Figure 4.1: P-V curve of a solar pa
Page 44 and 45: 4.3.2 Efficiency of convertersTo at
Page 46 and 47: Figure 4.3: Consumptions in % in me
Page 48 and 49: 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
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There is no data about the case to
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Capacitor selectionFour 10µF ceram
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• Output voltage: 5V.• Maximum
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Figure 5.12: Burst mode operation (
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Figure 5.14: Simplified schematics
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Figure 5.15: Worksheet for 3.3V con
Page 70 and 71:
sequently, the k was chosen above 0
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where G 1 is the initial control-to
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Figure 5.21: Measured Bode diagram
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Figure 5.26: Equivalence between th
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C f =12πf f R 0f,L f = R 2 0f C f
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Figure 5.37: Schematics of the firs
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R KR >1.45V100mA − 1.3A35= 23.07
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The schematics is shown on figure 5
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A commercial model meets all requir
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Figure 5.45: Schematics of the heat
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PrefixX7X5Y5Z5SuffixTemperature ran
Page 92 and 93:
6.2.1 The second dissipation system
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• The antenna deployment system.
Page 96 and 97:
6.3.3 TestsThe engineering model of
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7.3 ActivitiesAs OUFTI-1 is designe
Page 100 and 101:
8.1.2 DesignA model of Li-Po batter
Page 102 and 103:
[15] Fabien Jordan, Phase B Electri
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TaK = 273 + TaC;%Photo-current ther
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Appendix BPower budget worksheetIn
Page 108 and 109:
108
Page 110 and 111:
Appendix CPictures of the prototype
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Appendix DSchematics of the enginee
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876543213V3 CONVERTER AND INPUT FIL
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87654321ANTENNA DEPLOYMENT CIRCUITB
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Design and Implementation of On-board Electrical Power ... - OUFTI-1

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