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Discussion Starter #1 (Edited)

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I bought this heater last year together with a few other parts, after doing a lot of reading and watching I decided to try and figure out some of the workings, I watched Damien's videos over and over again to get this far. thanks to open source :)

Please contribute freely
Fabulous... thank you for sharing :D
 

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Discussion Starter #4
Very nice, so a drop inboard should be super simple.

monitor the three temperature sensors to keep it in check, reading the onboard current sensor should be easy.

it is an ACS current sensor. https://www.allegromicro.com/en/Products/Current-Sensor-ICs/Fifty-To-Two-Hundred-Amp-Integrated-Conductor-Sensor-ICs.aspx

simple 0-5V output, only question is if it is offset (bidirectional) or starting from 0V (unidirectional).
Yes, ACS758 with 0.680v @ 0 amps and 0.979v @ 5 amps
 

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cool so it is the X050U version with 60mv/A scaling with a 0.6V offset.

Used plenty with arduinos, however I would advise against using an Atmega328p as the control chip does run into some issues.

What frequency you driving the igbts during test? Mind looking at the input voltage with the scope to see if it is noisy?
 

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cool so it is the X050U version with 60mv/A scaling with a 0.6V offset.

Used plenty with arduinos, however I would advise against using an Atmega328p as the control chip does run into some issues.

What frequency you driving the igbts during test? Mind looking at the input voltage with the scope to see if it is noisy?
I was getting some buzzing at 976hz so I increased it to 30khz and its quiet as a mouse
 

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Discussion Starter #7
Tomdb I brought the frequency down to 122hz. Pic one shows the input PWM and pic 2 shows the out from pin 10 of the ACPL 38JT and pic 3 shows out from the one next to it.
Three of the outs show clean and three show a little noise, but the thing is if I unplug the noisey three I still hear the buzzing but a little softer
The HV I am testing at is around 80v so the IGBT'S don't get hot, not sure how they would fair at a higher voltage
 

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