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

• Switching Circuit [Need Research]

• Remove DC-DC

  • Remove all isolated 12V connection

  • Replace with VBAT

• Replace HV FET with solid-state relays [Need Research]

  • Q1 and Q2 system to be entirely replaced with solid-state relays

    • End changes

      • One end from HV_IN

      • Other end to pre-charge

        • iso_latch_out might be removed?

    • Links

      • https://electronics.stackexchange.com/questions/261711/how-can-i-replace-a-relay-with-a-mosfet-transistor

        • Reverse it?

      • https://electronics.stackexchange.com/questions/561102/can-i-use-mosfet-as-replacement-for-the-ssr-or-em-relay

  • Part Search

    • Check ratings

      • [Need to find parts that can handle 150V]

    • https://www.digikey.ca/en/products/detail/panasonic-electric-works/AQY221R2MY/1964538

      • ?

    • https://www.digikey.ca/en/products/detail/bright-toward-industrial-co-ltd/AA58F/14302559

      • ?

    • https://www.digikey.ca/en/products/detail/panasonic-electric-works/AQV101AZ/646033

      • ?

• Add Hall Effect Current Sensor [Need Research]

  • Remove entire middle section with Hall Effect Current Sensor

    • Must connect to IN+ and IN-

      • Unsure if AND gate and MOSFETs need to be changed

  • Part search

    • Check ratings (Current and voltage)

    • https://www.digikey.ca/en/products/detail/allegro-microsystems/ACS756SCB-050B-PFF-T/5400760

      • ?

    • https://www.digikey.ca/en/products/detail/lem-usa-inc/HO-8-NP-0000/4331974

      • ?

• Revision 1.2 revert?

  • Removing:

    • Fan control

    • Thermistor

  • Can we revert back to 1.1 and use that for 2.0?