Design and Implementation of On-board Electrical Power ... - OUFTI-1
Design and Implementation of On-board Electrical Power ... - OUFTI-1 Design and Implementation of On-board Electrical Power ... - OUFTI-1
• The antenna deployment system.• Sensors and ADC for the measurement of the housekeeping parameters of EPS and thetemperatures of the faces.• The protection circuit for the measurement system.The engineering model has the following interfaces:• Main PC104 connector of 4 × 26 pins. The pins attribution was managed by the OBCteam [9].• Five 2-pins connectors for the solar panels (Schottky rectifiers are included on the PCB).• One 4-pins connector for the batteries card.• Two 2- pins connectors for the shunt resistances of the dissipation system.• One 2-pins connector for the thermo-cutter of the antennas deployment system.• Nine 3-pins connectors for the temperatures probes.The card also include tests points and jumpers.• Four jumpers on each DC/DC converter:– between the batteries bus and the (+) input of the input filter,– between the (+) output of the input filter and the (+) input of the converter,– between the (+) output of the converter and the corresponding power bus,– and in the feed-back loop (to open the loop, for tests).• One jumper to short-cut a Schottky rectifier on the output of the 3.3V (for the testswith EPS2).• One jumper between the batteries bus and the connector to the batteries card.• One jumper between the batteries bus and the dissipation system.• One jumper between the 3.3V bus and the protection circuit of measurement system.The engineering model of the batteries card was not concretized yet. The batteries cardwill have to include: the batteries, the PCM’s, the USB charger, and the batteries heater.94
6.3.2 ImplementationThe implementation of the EPS is a complex work.The EPS card holds a lot of circuits and connectors. The density of components per unityof surface will is high. A multi-layer PCB is required. There are very sensible measurementscircuits and noisy DC/DC converters on the same card, which can make the layout morecomplex. The PCB also have to make the heat circulation from the transistor of the dissipationsystem to “cold points” easier.We took the decision to subcontract the realization of the engineering model PCB. Thesubcontractor was Deltatec.DeltatecDeltatec is a small company based in Ans near Liège. The company is specialized in electronics,hardware and software. They have an experience in the production of space-certifiedPCB’s as they were one of the subcontractors of Thales Alenia Space.Documents provided to DeltatecA complete document was written for Deltatec. This document included:1. The complete electrical schematics of the engineering model of the EPS card.2. The complete list a used components, with manufacturer’s reference and the commandcode of a distributor. This list can be found in the Appendix.3. The datasheets of used components.4. A quick presentation of the EPS.5. Mechanical, electrical and thermal specifications for the EPS card (mechanical andthermal specifications were written with the MECH and THER teams.Work done by DeltatecDeltatec had to make the layout of the card. The company had to order the components,subcontract the manufacturing of the PCB and was responsible of the assembly of the componentson the PCB.Final productThe final product of Deltatec was two complete cards (PCB with soldered components andPC104 connector) and tree empty cards (only PCB with layout and PC104 port). No electricaltests were made by Deltatec.95
- 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
- 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 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
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- 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
• The antenna deployment system.• Sensors <strong>and</strong> ADC for the measurement <strong>of</strong> the housekeeping parameters <strong>of</strong> EPS <strong>and</strong> thetemperatures <strong>of</strong> the faces.• The protection circuit for the measurement system.The engineering model has the following interfaces:• Main PC104 connector <strong>of</strong> 4 × 26 pins. The pins attribution was managed by the OBCteam [9].• Five 2-pins connectors for the solar panels (Schottky rectifiers are included on the PCB).• <strong>On</strong>e 4-pins connector for the batteries card.• Two 2- pins connectors for the shunt resistances <strong>of</strong> the dissipation system.• <strong>On</strong>e 2-pins connector for the thermo-cutter <strong>of</strong> the antennas deployment system.• Nine 3-pins connectors for the temperatures probes.The card also include tests points <strong>and</strong> jumpers.• Four jumpers on each DC/DC converter:– between the batteries bus <strong>and</strong> the (+) input <strong>of</strong> the input filter,– between the (+) output <strong>of</strong> the input filter <strong>and</strong> the (+) input <strong>of</strong> the converter,– between the (+) output <strong>of</strong> the converter <strong>and</strong> the corresponding power bus,– <strong>and</strong> in the feed-back loop (to open the loop, for tests).• <strong>On</strong>e jumper to short-cut a Schottky rectifier on the output <strong>of</strong> the 3.3V (for the testswith EPS2).• <strong>On</strong>e jumper between the batteries bus <strong>and</strong> the connector to the batteries card.• <strong>On</strong>e jumper between the batteries bus <strong>and</strong> the dissipation system.• <strong>On</strong>e jumper between the 3.3V bus <strong>and</strong> the protection circuit <strong>of</strong> measurement system.The engineering model <strong>of</strong> the batteries card was not concretized yet. The batteries cardwill have to include: the batteries, the PCM’s, the USB charger, <strong>and</strong> the batteries heater.94
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