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

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Figure 4.3: Consumptions in % in mean case, with V batt = 3.7V, η ampl = 30%, and a Tx usageof 31%.4.4.3 Hot caseAssumptions:• No eclipse.• Solar panels temperature of 45 ◦ C.• Battery Heater turned off.• 3.3V supplied by EPS2.• The mean power produced by an effective surface of one A panel at 4.2V is 1.9W.We stated that the produced power at a given voltage was proportional to A eff when thebatteries voltage was under the MPP voltage. This condition was true for voltage between2.6V and 4.2V when the temperature was under 15 ◦ C. This is thus not true anymore in thehot case.Figure 4.4 shows the P-V curve of one solar panel at a temperature of 45 ◦ C facing thesun and the cumulated P-V curve of three solar panels at a temperature of 45 ◦ C when acorner of the CubeSat is oriented toward the sun (then A eff = √ 3A panel . In the first case,the produced power is around 1.7W at 4.2V while in the second case the produced power isaround 3.5W at 4.2V (which corresponds to 2W per A panel ). In the second case, the MPPvoltage is higher. This is due to the fact that when a face receives less insolation, its MPPvoltage is higher.In either case, the MPP voltages is higher than 3.7V. For voltage of 3V and 3.7V, theproduced power is thus still proportional to A eff .46
Figure 4.4: P-V curve of one solar panel facing the sun, and of three solar panels when thecorresponding corner is oriented toward the sun, at T = 45 ◦ C.Batteries voltage [V] 3 3.7 4.2Power input per orbit [mWh] 2,566.5 3,228.8 3,559.9Tx usage (η ampl = 30%) % 34 51 55Tx usage (η ampl = 50%) % 64 92 9947
Page 2 and 3: AcknowledgementsI want to thank the
Page 4 and 5: Contents1 Introduction 91.1 Cubesat
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 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
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 100 and 101:
8.1.2 DesignA model of Li-Po batter
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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