Propose v0.3.0 functional, safety, and performance requirements

[dimembermatt]

From meeting notes:

Safety

• temperature monitoring of high risk components
  • gate driver
  • FETs
  • inductor
• antisurge protection
  • resistor + high voltage (max boost voltage * SF) diode path at switch node to handle voltage spike
    • yes it's a snubber circuit but no it's not supposed to be active during normal use
• extra hardware lockouts
• fan header support for additional active cooling (1W @ 12V) - M3 holes (default state on if unplugged)
• heat sink support for additional passive cooling
• potential new connector for ease of use and current capacity

Functional

• swap down from Nucleo to chip (aim for 50% size reduction) (pull from existing team sch)
• USB C connector, DCDC regulator (isolated? or with reverse polarity protection)
• noniso CAN (pull from existing team sch)
• higher performance MCU -> aim for 200 MHZ
• dedicated ICs for current and voltage monitoring instead of the STM ADC
  • use I2C/SPI protocol
  • 12 bit
  • 100 kHz sampling rate
  • possibly autobuffer
• shrink pcb size

Performance

• battery specs
  • 80V - 134V
  • use same model, assume 10A max input
• array specs
  • 0V - 80V VOC (25V - 70V, >100W)
  • 6.15A ISC
• 25% SF
• input inductor current ripple: N/A
• input capacitor voltage ripple: 1 V
• output capacitor voltage ripple: 1 V
• target efficiency: 99.5% at MPP

Cost Estimate for 5 PCBS

• PCB
  • 4 Layer
  • 2oz copper
  • both sides assembly
  • ~200 - 250$
• Additional Components
  • 500$
• Labor
  • priceless (worthless)

150 USD per PCB

Action Items

• 4/30: List of comprehensive tasks to be performed on optimization pipeline, simulation, sch/pcb, testing, etc (put on Github Project)
• 5/1: Preliminary schematic with BoM, begin initial review
• 5/4: Finalize schematic after full approval by (3) reviewers
• 5/4: Order initial test equipment
• 5/8: Preliminary layout, begin initial review
• 5/11: Finalize layout after full approval by (3) reviewers
• 5/12: Order pcbs and components
• 5/18: PCBs arrive, begin assembly
• 5/20: PCBs assembled, initial testing
• 5/30: Finish prelim testing, ship back to Austin