Author Topic: Dual Tesla Coils + STM32 Interrupter  (Read 649 times)

Offline buchtawill

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Dual Tesla Coils + STM32 Interrupter
« on: November 08, 2022, 01:55:09 AM »
Hi all,

I've been working a while to finish my latest project: Dual tesla coils.
I built the coil in the background (https://highvoltageforum.net/index.php?topic=1820.msg13736#msg13736) last year, and the one in the foreground is from High School, but I just recently remade the bridge.

Large DRSSTC Specs:
*Two 15,000uF 350V aluminum electrolytics in series for 7,500uF @ 700 VDC rating
*Power thru variac for up to 400V on the bus
*FF450 series IGBTs, 1200Vce
*15 strings of 4 942C20P15K caps in series for ~550nF @ 8KVDC, 1.4KV rms derated.
*Resonant frequency of around 65kHz
*Secondary coil is 2600 turns of 26AWG wire on 6" PVC, ~43" long. Coated with 2 layers of epoxy
*Primary is 5-6 turns of 3/8" copper tubing. Connections to primary and MMC are 2 strands of 6 AWG wire
*Primary circuit is mounted on large heat sink, all connected by 4mm copper busbar

The small DRSSTC is mostly the same setup with the following differences:
*Two 7500uF 450V caps in parallel for bus
*FF300 IGBTs
*8 Strings of 3 942c's for 400nF
The builds are in more detail at tinyurl.com/jwbportfolio

The controller is an STM32 that I've been working on for some time. Picture:
https://drive.google.com/file/d/15Gp3NMeHEMvSUrNwgxKkPHHWWeDvV4nO/view?usp=sharing

It works great, but note that I put the micro SD card footprint facing 180 degrees the wrong way - the type of mistake you only make once lol. It still works, it's just a bit tricky to get the card out sometimes. The whole thing is connected to a 20x4 LCD via I2C. I made a custom file format for it as well; I wrote some python that essentially takes the MIDI file and spits out a binary with the timing/frequency/pulse width of notes.

This was my first time testing the whole thing together, and it was nice to see it work. Let me know what you think!

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Dual Tesla Coils + STM32 Interrupter
« on: November 08, 2022, 01:55:09 AM »

 


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