3phase EMW charger variant
Posted: Mon Apr 26, 2021 9:29 am
I got some requests for schematics and code for EMW charger variant i am using.
I am posting the latest code here together with my design files and Wifi module link Dima prepared for remote starting.
https://github.com/dimecho/ESP8266-EMW-Charger
Be advised code is semi-opensource. There is a disclaimer in the code header. As long as you use it for your own application you are good.
My configuration of the charger is in 3phase RST operating from phase voltage 400Vac. This means 600Vdc rectified voltage.
It can operate reliably down to cca 200Vdc with 200A IGBT.
https://github.com/arber333/3phase-EMW-kind-of-charger
My latest design is using old V9 schematic with two ISO124 isolated op amps and DCDC +/-15V supplies.
Power board is used just so i can mount driver board directly to IGBT and pickup input and output voltages and current.
ISO124 enable me to use direct voltage sensing without need for calibration before connection to a car. This eliminates that dogy uLCD and its library.
I just use D1 mini Wifi interface i linked in the start and set my voltage and current.
Since V14 code uses effective PID it is really soft on start so you dont trip any fuses and it keeps charger within 0.5A and 1Vdc range
In case i need 1phase charging i use a trick. I have 2x 5000uF capacitors rated 450Vdc wired in series for 900Vdc work. If i need to create 600Vdc from 320Vdc rectified single phase i connect N line directly to middle cap bracket. Result is good 640Vdc but sustained load is a lot less than 3.6kW single phase should allow! https://ec.kemet.com/blog/voltage-doublers/
Ill post some photos later...
I am posting the latest code here together with my design files and Wifi module link Dima prepared for remote starting.
https://github.com/dimecho/ESP8266-EMW-Charger
Be advised code is semi-opensource. There is a disclaimer in the code header. As long as you use it for your own application you are good.
My configuration of the charger is in 3phase RST operating from phase voltage 400Vac. This means 600Vdc rectified voltage.
It can operate reliably down to cca 200Vdc with 200A IGBT.
https://github.com/arber333/3phase-EMW-kind-of-charger
My latest design is using old V9 schematic with two ISO124 isolated op amps and DCDC +/-15V supplies.
Power board is used just so i can mount driver board directly to IGBT and pickup input and output voltages and current.
ISO124 enable me to use direct voltage sensing without need for calibration before connection to a car. This eliminates that dogy uLCD and its library.
I just use D1 mini Wifi interface i linked in the start and set my voltage and current.
Since V14 code uses effective PID it is really soft on start so you dont trip any fuses and it keeps charger within 0.5A and 1Vdc range
In case i need 1phase charging i use a trick. I have 2x 5000uF capacitors rated 450Vdc wired in series for 900Vdc work. If i need to create 600Vdc from 320Vdc rectified single phase i connect N line directly to middle cap bracket. Result is good 640Vdc but sustained load is a lot less than 3.6kW single phase should allow! https://ec.kemet.com/blog/voltage-doublers/
Ill post some photos later...