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Team MADD Michael Davies Andrew Mountain Dan Hoang Daniel Brink

Power Distribution Control Unit. Team MADD Michael Davies Andrew Mountain Dan Hoang Daniel Brink. History/Background Citizen Explorer. Citizen Explorer-I (CX-I). Designed and built by students at Colorado Space Grant Consortium in Boulder.

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Team MADD Michael Davies Andrew Mountain Dan Hoang Daniel Brink

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

  2. History/Background Citizen Explorer

  3. Citizen Explorer-I (CX-I) • Designed and built by students at Colorado Space Grant Consortium in Boulder. • The mission design allows K-12 schools around the world to be involved as ground stations available to receive science data and telemetry from CX-I. • Two instruments, an aerosol meter and UV detector, will be used by the K-12 students to take measurements on the surface of the Earth. • A low level of artificial intelligence will be supplied to the spacecraft through the use of the Automated Scheduling and Planning Environment (ASPEN). ASPEN is used to maintain a spacecraft schedule in order to achieve the objectives a mission operator would normally have to complete.

  4. MADD Project Purpose Design a new Power Distribution Control Unit (PDCU) for the Colorado Space Grant Consortium’s Citizen Explorer spacecraft. The new PDCU must meet CSGC’s reliability requirements and integrate as a functional subsystem the satellite.

  5. MADD Objectives Software Functionality • Control the power distribution to seventeen component systems of the spacecraft Receive desired state commands from the flight controller and ensure that the component system is in the desired state – otherwise send flight computer an error message Store the state of each relay into memory every 5 seconds, in case of a power failure • Check for proper functionality of flight computer • Authorize digital signature from flight controller, otherwise provide a power pulse to restart flight controller • Relay the status of the PDCU through voltage, current and temperature readings

  6. MADD Objectives Hardware Functionality • Using a 12V source, provide four alternate voltage power buses • Secondary Objective is to design the 24V boost converter • Using relays that receive a signal from the micro controller, control the power distribution to seventeen component parts of the system • Fit the dimensions – 7.15" X 7.65" X 2.7" • Build wire wrapped prototype • Transfer to PCB

  7. MADD Objectives Reliability • Nature of project reliability is a critical concern • Included in design should be ability to check proper function of system • Devise a system for testing to prove reliability Expand the test to use LED or other display devices • Emphasis on very tight, consistent and reliable code

  8. Flight Computer Battery PCB PDCU Micro Controller Power Converters Thermistors Relays Critical Decoder ADCS COMM Science

  9. CPU PCB RS485 Micro Controller Flash Memory Therm Power Converters Therm 17 Relays LED LED LED LED

  10. Hardware Micro Controller • Manufacturer: Microchip Technology • Part number: PIC16C877 • Micro controller specified by CSGC • Choose the 877 over 77 because of the flash memory incorporated into the chip RS-422/485 chip • Manufacturer: Maxim Integrated Products • Part number: Max3082E • Provides communication between micro controller and flight computer

  11. Hardware RS-232 chip • Manufacturer: Maxim Integrated Products • Part number: Max208 • Provides mechanism for interface with PC serial port, can be converted to RS-422/485 Relays • Manufacturer: Crydom • Part number: DM063 • Part specification from CSGC

  12. Hardware Thermistors • Manufacturer: Yellow Springs Instrument • Part number: YSI44901 Memory • Flash or FRAM • Looking into the necessity of memory in addition to the memory on the micro controller, depends on program storage requirements • FRAM more stable for space conditions • Decision to be made within a week

  13. Hardware Power • 24V boost converter • CSGC design • Power Buses all capable of 5 watts • 15V converter • -15V converter • 5V converter • 12V converter

  14. Risks/Contingency • Contingency • Help from Space Grant • Order parts early • Drop PCB • UROP/Space Grant Risks • Unfamiliar technology • Part availability • Time constraints • Funding

  15. Project Schedule

  16. Divisions of Labor • Mountain: PCB Design • Brink: Hardware Layout • Davies: RS422/485 Protocol, PIC Programming • Hoang: RS422/485 Protocol, PIC Programming

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