Pre-Charge [MSXV]

Link to Previous Proposed Changes for Pre-Charge:

Link:

Changes for MCI Rev 2.0

New Suggestions

• Motor controller capacitors are currently charged with a constant voltage source and series resistor. This is always 50% efficient. For a challenger vehicle, it might be better to have a switching circuit (buck topology) to charge with constant current (which would also be faster).

• Keep to 12V by removing DC DC inversion

• Add hall effect sensor

• Make simpler by removing irrelevant portions (e.g. fan control and thermistor may have been exclusive to MOV since shorts less of an issue?)

Research Summary

• Simplify Charge Pump and Depletion Mode FET

  • U4

    • Original parts

      • Charge pump switch regulator

        • https://www.digikey.ca/en/products/detail/microchip-technology/tc7662beoa713/418710

      • Depletion mode FET

        • https://www.digikey.ca/en/products/detail/ixys/ixth6n50d2/2183273

    • New Change

      • Find closed switch to replace the two components

        • Solid-state relay

• Smaller changes

  • Removing:

    • Fan control

      • Remove fan connector

      • Remove entire fan control sheet

    • Thermistor

      • Remove thermistor connector

      • Remove entire thermistor sheet

  • Add jumpers near AND gate to skip it