We should have calculations, sound reasoning, and documentation for all the values chosen for the following changes.
Inputs
- Find Lower Resistance Fuse (Voltage Drops in Power Path Selection)
Ideally with a smaller package size as well (the fuse could be old therefore having higher resistance?)
MINI 297 (ATM)
Fuse Holder: Keystone Electronics 3568 - Digikey Link
Fuses: LittleFuse Mini 297, or Cooper Bussmann ATM - Digikey Link
MICRO (ATR)
Fuse Holder: I can’t seem to find any dedicated ones, but the Keystone contacts for the Mini series (without the cover) should work but is not as elegant.
Fuses: LittleFuse Micro2 327 or Cooper Bussmann ATR - Digikey Link - Use only 2 parallel FETs for the power selection inputs (Power Path FETs Power Dissipation and Temp Rise)
- Find connector to replace screw terminal for easier assembly (not high priority)
TE ET Power, recommended per the Stanford Connector Selection document:
Part numbers are on Pg 102 of this PDF: https://www.ttiinc.com/content/dam/ttiinc/manufacturers/te-connectivity/PDF/sg_tyco_ENG_CS_1773096_FULL_POWER_CATALOG_0512.pdf
Housing: https://octopart.com/1982299-1-te+connectivity-44516067?r=pap
Connector: https://octopart.com/2042274-1-te+connectivity-44516073
Crimps: https://www.digikey.ca/product-detail/en/te-connectivity-amp-connectors/927829-5/A122186CT-ND/5418209 - Add current sense to power supply input (instead of 0 ohm resistor)
Unless there was a good reason it was not there to start - Aux Switch Implementation (to completely turn off the car)
Reset Loop
Power Distribution Testing for Switchover and Loops
- Refine Capacitor values for lowering the inrush current
- Reduce Gate Slew rate for DC-DC and Power Supply
- Verify DC-DC voltage limits for UV (keeping in mind inrush current and voltage drop while running at 17A)
- Check the AUX under-voltage time extension capacitor
- Fix voltage sense locations (so that it is not affected by inrush current from capacitor to capacitor)
Temperature Sensing
- Update temperature sense RC filter values
- Check with Aashmika to get the DC-DC temperature sense pinout correct
- Change 3V0 LDO to a non-QFN package
- Separate the AUX power and thermistor connectors
So we can do a higher current connector for power and a small footprint connector for sense
General
- Add fuse to output for output cable protection
- Add block diagram
- Consider making all current sense resistors the same
- Consider adding input for the Charger 12V 5.5A output - so that we power the car from the wall when charging.