PLC EVSE

For use together with pyPLC.

This is a KiCad 8 project. Only the schematic, no board.

BOM

• C1, C2, C3: elcap, 100µF, 25V
• C20: ceramic, 1nF (something between 1nF and 2.2nF is fine)
• U1: op-amp LF355
• U2, U3: isolated DCDC converter, 5V to 12V, 1W, e.g. B0512S-1WR3
• R1: 1k
• R2: 270ohm
• R5: 56k
• R6: 100k
• R7: 220k
• R8, R9: 120k (does not really matter, also 100k would be fine)
• R20: 180ohm (does not really matter. Something between 100ohm and 330ohm.)
• D1, D2: LEDs WS2812B. Also one would be sufficient.
• RV1: potentiometer e.g. 10k linear (also 1k or 22k would be fine)
• A1: Arduino Nano
• Prototyping board 100mm x 106mm
• Housing 3D printed, FreeCad mini-evse-housing.FCStd, or step: mini-evse-housing.step
• For power supply: USB A cable, cutted and soldered to the board.

References

• Better alternative TLV1805 instead of the old-fashioned LF355, with high slew rate and better output swing: https://github.com/SebiR/EVSE_Emulator_Shield/blob/master/output/EVSE_Arduino_Shield_SCH.pdf
• Reference design for EVSE using the TLV1805 from TI: https://www.ti.com/tool/TIDA-010239