Author Topic: Ebay Bipolar Tesla Coil Rebuild  (Read 205 times)

Offline Razerwire

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Ebay Bipolar Tesla Coil Rebuild
« on: June 30, 2022, 05:19:18 AM »
So after doing all the research I've decided on replacing the obsolete (blown up) IGBTs from my ebay bipolar coil with APT50GS60BRDQ2G x2. Have any of you more experienced builders used these before? Thoughts? I'd appreciate any feedback. Thanks.
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Offline Razerwire

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Re: Ebay Bipolar Tesla Coil Rebuild
« Reply #1 on: July 01, 2022, 05:54:57 PM »
Update... the APT50GS60BRDQ2G TO-247 IGBTs are working very well after making some changes to the driver and removing a flat washers worth of topload. I added 960uF of electrolytic capacitance directly off of the voltage doubler. I wound another single wire to my trifilar wound 1:1:1 GDT, tucking the wire in between the twisted windings to and holding in place with hot glue to maximize coupling. I also have a GDT coming from CoilCraft (for my OCD LOL). After doing the GDT work I briefly had a stress attack because I was suddenly getting no output. ZERO. Thought it out for awhile after unsoldering and testing the high side IGBT... it was the feedback coil! Since I reinstalled the GDT and the primary winding is not polarized (I should say, it IS polarized but it's polarity doesn't affect the secondaries. However it will cause switching out of phase with the drive circuit!) I had simply soldered the primary GDT leads opposite of the way they were so the option was switch the GDT primary leads around or swap the single loop feedback leads around and I chose the later as it WA easier. Finally I added another 0.33uF MKP to the primary and my God did this baby come alive! It SCREAMS now. 30+cm arcs between posts... this bipolar coil is a completely new type to me but I do like the arc form and how much power out you can achieve vs power in. So now if I'm not careful how I wind the coil up with the interrupter, I also now get arcing from primary to secondary and long sparks running along the secondary from torroid to torroid! Basically  I have to get the BPM up before I apply too much power otherwise the arc will tend to jump out of the primary and shoot along the entire length of the secondaries surface. I haven't noticed any damage at this point but I need to somehow correct this going forward. Any advice on snuffing out the racing arcs and pri/sec flash over would be much appreciated! I've never dealt with it anywhere near this bad.... pics/video to follow soon. Feel free to ask questions or chip in with any tips or suggestions. Everything I've done so far was accomplished on my own by studying and experimenting and I'd like to share the experience now that I have something to share. I welcome all the advice I can get. Thanks guys. -Rex-
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Offline Mads Barnkob

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Re: Ebay Bipolar Tesla Coil Rebuild
« Reply #2 on: July 02, 2022, 09:14:29 PM »
Low BPS racing sparks and flash-overs is also a problem I have with my DRSSTC1 at BPS rates below 100 Hz, maybe some lower than that, but generally it gets unstable and will not oscillate properly and starts to do racing sparks.
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Re: Ebay Bipolar Tesla Coil Rebuild
« Reply #2 on: July 02, 2022, 09:14:29 PM »

 


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