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

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4.4.2 Mean case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 454.4.3 Hot case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 465 Electrical Design of EPS 485.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 485.2 Design of Converters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 485.2.1 Theory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 485.2.2 Design of 7.2V converter . . . . . . . . . . . . . . . . . . . . . . . . . . 565.2.3 Design of 5V converter . . . . . . . . . . . . . . . . . . . . . . . . . . . 615.2.4 Design of 3.3V converter . . . . . . . . . . . . . . . . . . . . . . . . . . 655.2.5 Remarks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 685.3 Design of input filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 705.3.1 Type of filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 705.3.2 Stability problem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 705.3.3 Middlebrook’s criterion . . . . . . . . . . . . . . . . . . . . . . . . . . 715.3.4 Comparison between Middlebrook’s criterion (Z D (s) and Z N (s)) andmeasured Z in (s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 725.3.5 Measurements of the input impedance of the converters . . . . . . . . 735.3.6 Frequency design of the filters . . . . . . . . . . . . . . . . . . . . . . . 765.4 Design of the dissipation system (shunt regulator) . . . . . . . . . . . . . . . 785.4.1 Choice of Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 785.4.2 First version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 795.4.3 Second version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 805.4.4 Components design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 815.5 Design of the protection circuits . . . . . . . . . . . . . . . . . . . . . . . . . . 835.5.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 835.5.2 Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 835.6 Design of the antennas deployment circuit . . . . . . . . . . . . . . . . . . . . 845.6.1 Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 845.6.2 Implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 845.6.3 Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 855.6.4 Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 855.7 Design of the battery heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . 865.7.1 Control by the OBC . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
5.7.2 Independent control . . . . . . . . . . . . . . . . . . . . . . . . . . . . 865.8 Design of the measurement system . . . . . . . . . . . . . . . . . . . . . . . . 885.9 Components selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 895.9.1 Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 895.9.2 Capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 895.9.3 Dielectric . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 895.9.4 Rated voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 905.9.5 Bending strength . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 905.10 Schematics of the EPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 906 Prototypes of the EPS 916.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 916.2 The breadboards model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 916.2.1 The second dissipation system . . . . . . . . . . . . . . . . . . . . . . 926.2.2 The protection circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . 926.3 The engineering model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 936.3.1 Included systems and interfaces . . . . . . . . . . . . . . . . . . . . . . 936.3.2 Implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 956.3.3 Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 967 Miscellanous activities, presentations and publications 977.1 Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 977.2 Presentations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 977.3 Activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 988 Conclusions 998.1 Accomplished work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 998.1.1 Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 998.1.2 Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1008.1.3 Implementation and tests . . . . . . . . . . . . . . . . . . . . . . . . . 1008.2 Future work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100A Matlab code for the I-V curves of solar panels 103
Page 2 and 3: AcknowledgementsI want to thank the
Page 4 and 5: Contents1 Introduction 91.1 Cubesat
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
Page 68 and 69:
Figure 5.15: Worksheet for 3.3V con
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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
Page 114 and 115:
876543213V3 CONVERTER AND INPUT FIL
Page 116:
87654321ANTENNA DEPLOYMENT CIRCUITB
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Design and Implementation of On-board Electrical Power ... - OUFTI-1

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