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Space Grant Satellite Power Distribution Control Unit

Develop a power distribution control unit for Colorado Space Grant’s Satellite Citizen Explorer. Implement commands from the flight computer to manage power to subsystems and monitor temperatures and power buses. Features solid state relays, voltage dividers, and PCB board with rigorous power supply testing. Includes basic software functions for control. Division of labor among team members. Milestones include prototype completion and PCB design.

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Space Grant Satellite Power Distribution Control Unit

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  1. Power Distribution Control Unit Michael Davies Andrew Mountain Dan Hoang Daniel Brink

  2. Functionality • Power Distribution Control Unit for Colorado Space Grant’s Satellite Citizen Explorer • Implement commands from the satellite’s flight computer to provide the desired power to the unit’s subsystems • Monitor specified temperatures and power buses

  3. Schematic

  4. Distribution of Power • 17 – 4-Pin solid state relays • Control using 5V logic • Direct I/O with PIC • Connected with desired voltage

  5. Schematic

  6. Temperature • Voltage Divider • Maximum range voltage – low power consumption • Analog multiplexer • A/D converter on chip

  7. Schematic

  8. Power Supplies • Rigorously test power supplies • Power draw on each bus • Concern with noise on 5V power bus • Pi-Filter near each chip that require 5V

  9. PCB Board • 4-Layer Board • 2 Parallel 7.15" X 7.65" boards • Through hole parts for stability 7.15" X 7.65"

  10. Parts List • Microcontroller: PIC 16C77 • Relays: DMO063 • Clock: ACH-20.000MHz • Thermistor: YSI44901 • 12v to 15v/-15v Converter: JR12D15-330 • 12v to 24v Boost Converter: SI12S24-1250 • 12v to 5v Converter: LANC1205W5S • Flight Computer Interface: RS485/422 Max3082ESH • PC Interface: Max208CN6

  11. Microcontroller

  12. Relays

  13. Thermistors

  14. Flight Computer InterfaceSerial Communication

  15. PC Interface

  16. Basic Software Functions INITIALIZE VOLTAGES DELAY CURRENTS TEMPS SEND INFO?

  17. Basic Software Functions SET ANALOG SWITCH POS 1 VOLTAGES SAVE VOLTAGE 1 SET ANALOG SWITCH POS 2 SAVE VOLTAGE 2 SET ANALOG SWITCH POS n SAVE VOLTAGE n A/D CONVERSION RETURN

  18. Basic Software Functions INTERRUPT TRANSMIT RECEIVE OTHER? RETURN

  19. Basic Software Functions RECEIVE READ BYTE SET RELAYS SEND INFO RETURN

  20. Basic Software Functions BOOT SEQUENCE CD&H 1 min delay REQUIRED -extra delay for FC ADCS 3-5 sec delay Mnet 3-5 sec delay ARBITRARY Science 3-5 sec delay Deploy

  21. Schedule

  22. Division of Labor • Michael Davies: Software • Andrew Mountain: PCB/Schematic Design • Daniel Brink: Hardware layout • Dan Hoang: Hardware/Software interfacing

  23. Milestones • Milestone 1: Completed Prototype (wire wrap) and interface-able test code • Milestone 2: Completed PCB Design and ready to order (first revision) • Design Expo

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