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Registered Member #62053
Joined: Mon Dec 25 2017, 09:18AM
Location: Austria
Posts: 3
Hello everybody
I am currently 16 years old and i am from Austria. have finished building my first DRSSTC about 3 months ago and now i want to build a QCWDRSSTC.
Here you can see a video about my first DRSSTC. I am very happy with the results:
I think the most difficult part of a QCW is the buck converter and because of that, i want to build the buck converter first. I tried uploading this code to my Arduino UNO, but i am having issues with it: (I scrolled all the way down for the final version) Instead of a PWM ramp signal, i am only getting square wave pulses:
Maybe the issue is that i am using an Arduino UNO instead of an Arduino DUE?
Registered Member #59110
Joined: Mon Apr 11 2016, 04:35PM
Location: Camarillo, California
Posts: 74
Phoenix,
You are heading in the right direction. I used the same code to make a QCW based on loneoceans design. I started with the dual IGBJT Buck switch but moved to the Brick. I recommend going directly to the Brick.
I am assuming that you added the correct variant.h file so that the Arduino can go up to 20kHz PWM?
As far as the Uno vs the Due I used the Due which is the board Finn used. I am a microproccesor idiot but if I were you that would be the first thing to address.
Finally, Finn's program generates a ramp and an interrupter pulse. Are you sure you are looking at the right output pin?
Registered Member #62053
Joined: Mon Dec 25 2017, 09:18AM
Location: Austria
Posts: 3
Thank you very much for your response, alan
I am going to use a Brick from the beginning for the buck converter, because is still have some left over from my DRSSTC. They are Semikron SKM200´s and they are rated for 300A hard switching.
I have now probed the PWM output instead of the Pulse output, but it still does not look right to me:
I already tried to change the PWM frequency in the Variant.h file, but there is no file named like that. I believe only the DUE has such a directory. Maybe the UNO is locked to a lower PWM frequency (arround 950 Hz) that can´t be changed. I think i am going to have to buy a DUE.
Edit: I just found out that you can actually change the PWM frequency in the TCCRnB register to 62.5 kHz. I am going to try that later when i get back home.
Registered Member #62053
Joined: Mon Dec 25 2017, 09:18AM
Location: Austria
Posts: 3
It has been 2 years and now I actually started this project. Last week I got the parts for the buck and the buck works perfectly fine. I made my own PCB and used a powerful IXD630 Driver IC with 30A of peak current in order to drive a SKM600 Brick. For the choke I used 3 T400-2 Amidon cores and put 45 Turns on them in order to get 115uH.
Here is a video of the buck pushing 150A into a resistive wire:
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First QCWDRSSTC: Questions
