IlliniSat-3 Power Board Channing Philbrick (ECE) Michael F. Lembeck, Ph.D. (AE)

Laboratory for Advanced Space Systems at Illinois (LASSI) LASSI supports students, faculty, and other customers utilizing small satellite resources designed, developed, and tested at the University of Illinois at Urbana-Champaign

CubeSat Development History CapSat CubeSail LAICE LASSI is responsible for five active spacecraft flight programs, which will be delivered for launch in 2019. SpaceIce SASSI^2

IlliniSat-2 Bus CubeSail LAICE CAPSat SpaceICE SASSI^2 CubeSat Class 2 X 1.5 U 6U 3U Science Mission Objective Ultra-Sail 260 m-long, 20 m2 solar reflecting film ribbon deployment experiment Atmospheric gravity wave studies Active cooling for CubeSats, quantum annealing, and fine pointing control via solar panel deformation Freeze-casting experiments to measure solidification velocity, dendrite and wall width, and particle concentration Spectrometer studies of chemical reactions and chemical species present during re-entry  Mass 3.5 kg 6.5 kg 2.8 kg 3.4 kg 3.3 kg Orbit Average Power 13.2 W 24 W 17.3 W 15.6 W Collaborators JPL CU Aerospace VA Polytechnic ARC NSF Northwestern Purdue Sponsor NASA ELaNa NASA USIP Launch Date 1Q2019 TBD 4Q2018 4Q2019

In-house interdisciplinary design, development, and test LASSI offers off-the-shelf bus components or custom hardware solutions depending on customer needs Aerospace systems engineering services Electrical engineering services Mechanical engineering services In-house test and operations capabilities Thermal vacuum chamber Vacuum bake-out Sun simulator for solar array testing Electromagnetic torquer Helmholtz test apparatus Weight and balance and inertial properties (Near-by vibration testing facility available on-call) Ground station, telemetry, tracking, and control

IlliniSat-3 Power Board Multi-semester project initiated last semester to develop power control and distribution board for next generation CubeSat Basic requirements and initial design completed and documented Several features not completed, unsuccessfully implemented, or considered out of scope in initial design Objective for this semester is to understand remaining, scope a subset of it for completion this semester, and provide implementation plan for remaining work Channing will provide an overview of what has been accomplished and what still needs to be worked out…

Power board features Battery management system Power management system Charging Status monitoring Temperature control Power management system Hot swap control 7V4, 3V3, 1V2 bus regulation Control system TI TMS570 series MCU CAN bus communication Watchdog timer Non-volatile memory

Power board features System Component Current Status Battery Management Battery charger Not yet implemented Status monitoring Successfully implemented Power Management Voltage regulation First iteration failure Hot swap controllers Integration failure Control Unit CAN Transceiver RS422 debug port Watchdog timer Non-volatile memory TMS570 MCU CAN not implemented