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Štěpán Rydlo 1c2a0b8cb5
COMM: Complete power supply share and convertor
2 years ago
diagrams diagrams: add diagram of proposed EPS module 3 years ago
modules COMM: Complete power supply share and convertor 2 years ago
resources resources: add script for renaming gerber to Gatema standard 3 years ago
.gitignore COMM: Create possibilty of switching between two battery 2 years ago
README.md notes: update notes with design of EPS 3 years ago

README.md

BUTCube

Modules:

  • Solar panels (XY, Z) (not in stack)
  • EPS
  • Flight Computer
  • Mission computer
  • Communication
  • Sun sensor module (not in stack)
  • ? Attitude control
  • Access port module (not in stack)

Solar panels

Solar cells

SM141K04L

  • Link: https://www.digikey.nl/short/fvpwbf4h
  • Panel count: 8 (2S 4P)
  • Maximal power: 0.98 W
  • Voltage: 4.46 V (MPPT)
  • Dimensions: 29 x 23 mm
  • Weight: 3g (24g)
  • Price (for 1 side): 28 € (750 CZK)

SM141K04LV

  • Link: https://www.digikey.cz/short/r589mmbj
  • Panel count: 8 (2S 4P)
  • Maximal power: 0.98 W
  • Voltage: 4.46 V (MPPT)
  • Dimensions: 45 x 15 mm
  • Weight: 2.5g (20g)
  • Price (for 1 side): 28 € (750 CZK)

Solar module

  • Two sizes of solar panel PCBs
    • Z - 100x100 mm with cutouts in corners for rails
    • X,Y - 100x83
  • In center of module is hole for another module
    • Approximate size of module is 46x30 mm
    • Mounting to frame is via 4 bolts in corners of board
  • Integrated components: Optodiode, temperature measuring IC

Sensors

  • Temperature sensor: AT30TS74
  • Photo diode:
    • VEMD5510C - 550nm (450-750) - visible
    • VEMD5060X - 800nm (500-1000) - visible + IR
    • VEMD5160X - 850nm (750-950) - IR (used)
  • ADC for photodiode: ADS7142

Cables

Stack connector

EPS

  • Two identical modules on one board
  • Both connected to stack connector
  • Other board could be connected to both or one of then
    • Power oring must be solved
  • Connected to main CAN

Power output

  • 3 regulated and monitored power rails - 1V8, 3V3, 5V
    • Output regulator - TPS63002DRCR
    • 0.8A (boost) up to 1.2A (buck) output
    • 2.2 uH coil
  • 1 unregulated output of battery, monitored
  • Monitoring via current sensors (INA??)

Battery

Battery heating

Access port module

Connectors:

  • USB-C

    • data connected to mission computer or flight computer
    • power connected to EPS for battery charging
  • 2x SWD port for programing and debugging of Flight and Mission computer

  • main CAN bus connector

  • UART debug port

  • Realized as stack of two PCB boards

    • Front acts only as cover for connectors
    • Connectors are mounted on rear board
    • Connectors are accessible via cutouts in frontz board
    • Rear board is mounted to front via column spacers

Other parts:

  • LTC4415 - Dual ideal diode with ORing
  • MAX16171 - Ideal Diode Controller with Reverse-Current Protection
  • BQ25798 - solar battery charger with dual-input selector and MPPT, I2C, https://www.ti.com/product/BQ25798
  • BAT54W-G - Low drop shottky diode, solar blocking diode
  • BQ27421YZFT-G1A - Fuel gauge

Digikey orders

https://www.digikey.cz/short/8nmn4tr3 https://www.digikey.cz/short/d4n94tbz