Power path: grid filter -> 3-phase rectifier -> buck stage -> output.
Let me walk you through this electric mayhem - again
Ingredients
- Metal enclosure that has to be lurking about in your basement (don't buy new)
- Heat sink (must also be left over from a previous project - EMW charger in my case)
- Fan (large 120mm from EMW charger)
- Rev2 or 3 inverter brain board
- Rev2 gate driver - half populated
- About 50A IGBT brick, 1200V! (in fact I use a 400A brick)
- 100A or so 3-phase diode rectifier (cheap as chips, these)
- an EMC grid filter (or your fuses will sing, also we want to be nice to the grid)
- Current sensor (here: half populated legacy sensor board)
- inductor (buck inductor from EMW charger)
- A 420µF film cap and a precharge resistor, discharge resistor (ooops, forgot about the latter)
- IC sockets (that are hot-glued to the Anderson connector to carry the ChaDeMo control signals)
Operation:
- Plug in ChaDeMo (best do this first, as the output goes live as soon as you plug in - who needs an output relay )
- Plug in mains, hit start
- The cars battery relay is closed
- The configured max charge current is transmitted via ChaDeMo
- The current command from ChaDeMo is obeyed
If you're interested I can upload the software to github. Works the same as the inverter software. Web interface, CAN mapping and all that. It's the same software as the 1-phase version.
But strong disclaimer: this charger is a mayhem, it offers multiple chances to be electrocuted - don't do this at home.