An Arduino AC Power Supply - I've been working on

[threephase03]

Hi All
Thought Id share a project I'm working on. Its at really early stages so far as I plan to go a lot further with it. But I'm using an Arduino Mega, AD9851, Digital potentiometer and a Class D amplifier, to create an AC signal from 45 - 65 Hz (limited by my ability to measure it). And a Energy Metering IC to measure the output.

Results with it so far have been mixed, with high impedance loads it seems to work quite well but the more power needed for lower impedance loads appears to be quite challenging.

Anyway thanks for reading and hope you get a chance to watch my progress so far, and any input you might also have.

Ill post a link to the first of four videos I've made so far of my progress.



 
     

[threephase03]

If anyone is semi-interested in the code watch this video, otherwise it might be a bit boring. It isn't anything special just a screen recording of me going through the code kinda quickly.
Thanks for watching if you get a chance.

https://youtu.be/XkytWO63umo

[threephase03]

https://youtu.be/qm2Nbl3WlTI

Does anyone know if I should look at matching a transformer with the desired voltage for when the amplifier is at max.

Kind Regards

[floobydust]

I can't understand the project without schematics or some design numbers, like watts, amps, sine, square etc?

Check your code: if (limits = true)  should be if (limits == true)

[threephase03]

Ok, The codes change's a fair bit, so there will probably be a couple of errors in there. But ill check out that thanks for letting me know.

So what I am trying to build is a Variable AC power supply that can regulate 50Hz or 51 52 with a perfect sine wave.
I will need to power at least
3 High voltage transformers - (doesn't add much load already checked and able to)
At least a 100VA Burden
And A High Impedance bridge

Once I can supply the burden at different voltages I think the rest I can do.

Thanks for checking out the video
 
 

[jbb]

Edit: realised first reply wasn’t helpful.

If you’ve got enough voltage but the waveforms are messy, you could try is to measure the AC output waveform with the microcontroller and use feedback to fix the non-linearity of the amplifier. It does involve some maths, though, so a bigger badder Arduino might be required.

[threephase03]

This is a video of before I was really getting into building it, I stepped it up through high voltage transformers. The video is pretty crappy at the time it wasn't going to go on youtube

[threephase03]

For those that are interested where i am at.