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Chademo Update

 While I'd managed to get Chademo working on some units, the ChargePoint CPE250 units that Instavolt use weren't working, I'd taken multiple logs and it looked like the units wasn't following the specification.

Basically, the station gives 12v on one pin, to initiate the process, when seeing this the car needs to send certain messages and give a signal to the station that the car is happy to proceed. Then the station locks the connector and starts it's isolation and various checks, ramps the voltage up to about 480v and then lets it fall again to under 20v. At this point the station grounds and other pin to close the Chademo contactors in the car and start the process. 

In my case my controller was seeing the station ground the pin to close the contactors at the same time as the 12v, I spent a log time pouring over the software looking for issues and making changes, assuming I'd got the hardware right :D


It turns out I'd got a resistor in the wrong place to pull up the final signal pin, a small silly mistake, but a quick fudge on the board and away we went.



Another quick change to the design and a 3 week wait now for JLCPCB to make up the bare board to make sure I've got it right this time 





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