This page serves as the central hub of Power Systems documentation for the 2024-2026 LHRs design cycle.
We use ClickUp for project management, please refer to this board for our 2026 tasks, deadlines, and status updates.
Power Systems projects are divided into three subsystems:
LV - low voltage power distribution/management and supplemental battery pack management
https://cloud.wikis.utexas.edu/wiki/spaces/LHRSOLAR/pages/186450500 - manages LV power distribution using eFuses and output status monitoring to alert the driver of faults
https://cloud.wikis.utexas.edu/wiki/spaces/28278790/pages/edit-v2/368157879/ - selects between supplemental LV battery and DC-DC converter output (main battery) to power all LV systems
https://cloud.wikis.utexas.edu/wiki/spaces/28278790/pages/edit-v2/368188475/ - reads temp and flow sensors, controls fans and water cooling pump
https://cloud.wikis.utexas.edu/wiki/pages/createpage.action?spaceKey=lhrsolar&title=%5BWIP%5D%20Supplemental%20Monitoring%20Board&linkCreation=true&fromPageId=28305861 - continually monitors voltage and current of the supplemental LV battery
HV - high voltage power distribution (contactors) and motor/regen control
https://cloud.wikis.utexas.edu/wiki/spaces/LHRSOLAR/pages/359697952 - drives motor/motor precharge contactors based on ignition/precharge state, controls motor based on driver inputs and car state (FSM), controls regenerative braking based on BPS state
https://cloud.wikis.utexas.edu/wiki/spaces/LHRSOLAR/pages/230884959 - houses precharge resistors and measures voltage difference fed into an isolated ADC to determine when precharge is complete
https://cloud.wikis.utexas.edu/wiki/spaces/LHRSOLAR/pages/453148675 - CAN bus and LV interface board for the Elcon fast charger
BPS - battery protection system, manages voltage, current, and temperature of the main battery pack
https://cloud.wikis.utexas.edu/wiki/spaces/LHRSOLAR/pages/28286841 - reads data from VoltTemp and Amperes boards over PCAN_BPS, communicates with critical systems over CarCAN to send safe/charging/trip messages
https://cloud.wikis.utexas.edu/wiki/spaces/LHRSOLAR/pages/28285429 - one board per battery segment (8 total) to continually measure voltage/temperature of cells
https://cloud.wikis.utexas.edu/wiki/spaces/LHRSOLAR/pages/172360934 - measures total pack current using a low-side shunt resistor