Public charger CP control

[evMacGyver]

Had some bad experience with public AC chargers so I need to know am I doing something wrong. Never got problems with home chargers which have no identification/payment delay.

Car detects charging plug from PP and charger supplies 12V and detects plugged car via CP (diode and 2.7k to ground). This is normal.
When CP should be controlled when using public charging station that is activated after plugging charging cable?

Does public station delay switching CP from 12V to PWM? If they do, could public stations get angry and not recover from it if car activates charging (by additional 1.3k CP to ground) before identification phase is done ?

Also could be that charging station does not supply CP at all before payment is done. If car activates CP charging state just after detecting PP, charging station gets angry and not recover.

Don't recall my charging control code right now, these are just my current thoughts what could happen.

[arber333]

Had some bad experience with public AC chargers so I need to know am I doing something wrong. Never got problems with home chargers which have no identification/payment delay.

Car detects charging plug from PP and charger supplies 12V and detects plugged car via CP (diode and 2.7k to ground). This is normal.
When CP should be controlled when using public charging station that is activated after plugging charging cable?

Does public station delay switching CP from 12V to PWM? If they do, could public stations get angry and not recover from it if car activates charging (by additional 1.3k CP to ground) before identification phase is done ?

Also could be that charging station does not supply CP at all before payment is done. If car activates CP charging state just after detecting PP, charging station gets angry and not recover.

Don't recall my charging control code right now, these are just my current thoughts what could happen.

Could be that EVSE needs a bit of time between "PP present", "Charger Ready" and "Cp activate" signals... I remember Tesla Level 2 EVSE had a thing for 30s delay from when i would connect cable and "manually" signal charging (1K3 resistor on a switch).

I would suggest you put a bit (0,5s) of delay after PP is sensed. Use millis delay loop.
Set transmitime variable to some value....

Code: Select all

  if(millis()-last > transmitime)  //Nominally set for xxx ms - do stuff on xxx ms non-interrupt clock
    {   
     last=millis();        //Zero our timer   
       }

[Bigpie]

I had same issue. Public charge point wanted to see car connected state for a brief period before extra resistor is brought in

[grgumxlm]

You can build as a fallback a manual adapter to activate by hand the AC current to a 32A CEE plug. You can get a cheap PCB here if you want it as compact as possible.



https://evsim.gonium.net

[evMacGyver]

Ok, delaying CP activation like 0,5 sec would improve things, but is that solution for all public chargers to function?

Have anyone checked does public chargers actually give PWM before payment identification is done? Because after connecting charge cable to a car, payment could delay charging process quite a bit because of these too many different sh***y apps, tags and all.

I'm just thinking if charge station does not give valid current limit before payment identification is done, it would be possible for EV to wait for valid current limit PWM and activate CP after that - not just delay after PP.