“ We could remove the DC-DC, replace the HV FETs with solid-state relays, and use a Hall Effect current sensor to detect the end of precharge. Everything would be isolated from HV, so we wouldn’t need an isolated 12V rail.
Or we could just add a forward-biased diode in series with the DC-DC input. ”

List:

Remove DC-DC

• It is not needed as we don’t need the isolated 12V rail

• Find out if every single thing for the 12V is removed or just some

  • What will replace ISO_12V and ISO_12V_SW

HV FET with solid-state relays

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

  • https://www.homemade-circuits.com/solid-state-relay-ssr-circuit-using-mosfets/

  • One end from HV_IN

  • Other end to pre-charge

    • iso_latch_out might be removed?

• Part Search

  • 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

Hall Effect Current Sensor

• 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

  • 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

Top Sheet Connections Changes:

• ISO_12V_SW

• IN+ (Stay)

• IN- (Stay)

• ISO_LATCH_OUT

• ISO_GND

• ISO_12V