Project

# Title Team Members TA Documents Sponsor
35 Power Board for IlliniSat-3
 Dongze Lu
Robert Maksimowicz
 Zhen Qin design_document0.pdf
final_paper0.pdf
presentation0.pptx
proposal0.pdf
# Team members:
Robert Maksimowicz - rmaksi2
Dongze Lu - dlu13

# Web Board Link:
https://courses.engr.illinois.edu/ece445/pace/view-topic.asp?id=27639

# Problem:
* Laboratory for Advanced Space Systems at Illinois’ (LASSI) attempts to redesign its current IlliniSat-2 bus, which is “too centralized”, to a new implementation - IlliniSat-3 bus. Currently, the Control and Data Handling (CDH) board controls the whole bus and almost every aspect of its functionality. To make a satellite mission more reliable once deployed, an existing commercial standard should be used, such as CAN (Controller Area Network) bus for inter-board communications. A new power board design has to be implemented, which is the goal of this project.

# Solution:
*We propose to redesign the power board, which will be responsible for battery charging, voltage regulation and output channel control. We plan on using the ATSAMS70 micro-controller, but this might change for a less powerful micro-controller. The board will have an RS-422 connection which will be connected to Control and Data Handling board for in flight updates. There will be a CAN transceiver chip included on the board.

The power board would be responsible for:
1. Battery charging
1a. Charge two 2-cell Lithium Ion battery packs
1b. Read battery voltage and current
1c. The battery pack itself is made in the house, and it handles the over-protection. We just have to focus on charging the battery
2. Voltage regulation
2a. voltage rails for 3.3V, 5V and custom (3-18V)
3. Output channel control
3a. Ten (10) configurable outputs
3b. programmable over-current limit
3c. short circuit protection
3d. hot swappable output
3e. current and voltage monitoring
3f. Configuration stored in software (FRAM for example)
4. Battery heater control
4a. Maintain healthy battery temps by controlling Kapton battery heaters based on temp. sensors

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