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Banned on 3/17/2009. Registered Member #487
Joined: Sun Jul 09 2006, 01:22AM
Location:
Posts: 617
Hmm the layout on those boards is horrible. Ihe igbt placement and heat sink solution is well, horrible too. I would agree with Steve, looks like primary feedback through an opto. I don't know of anything but optos that are 6 pin. What I don't get is if he is using a resonant primary which he must be if he's using primary feedback is why he doesn't increase break rate and decrease on time, but then again do I care?
Registered Member #1107
Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
I think that the only way that we are going to solve this mystery is to have someone "not me" buy one of those boards and reverse engineer it and come up with a schematic. Also i dont think the design is robust at all just by looking how tiny those heatsinks are. My opinion on how it works is pretty simple. The igbt's could really be scr's and those large elec caps are getting charged up with a buckboost converter and then being discharged into the primay coil. and that is why it can only run up to 5bps because any higher rep rate and caps will not charge in time. That also could explain Steve Ward's optocoupler theory because that could be driving the scr's So technically it is not a true resonant tesla coil and more of alarge pulse transformer.
Registered Member #1153
Joined: Mon Dec 03 2007, 07:27PM
Location: Croatia
Posts: 213
teslacoolguy wrote ...
I think that the only way that we are going to solve this mystery is to have someone "not me" buy one of those boards and reverse engineer it and come up with a schematic. Also i dont think the design is robust at all just by looking how tiny those heatsinks are. My opinion on how it works is pretty simple. The igbt's could really be scr's and those large elec caps are getting charged up with a buckboost converter and then being discharged into the primay coil. and that is why it can only run up to 5bps because any higher rep rate and caps will not charge in time. That also could explain Steve Ward's optocoupler theory because that could be driving the scr's So technically it is not a true resonant tesla coil and more of alarge pulse transformer.
I emailed him to purchase one board. Then we will reverse engineer it for 4hv
Registered Member #1025
Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
Here is a concept of an older model from this guy. It is IGBT H-bridge with antena feedback, so I do not expect that he switched to some crazy SCR technology...It is simply DRSSTC, but I'm still pretty curious about the schematics
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
It is a direct-feedback design (without gate drive electronics) pulsed at a very low rate (see @ ). This is also why the transistors can survive without overheating.
Banned on 3/17/2009. Registered Member #487
Joined: Sun Jul 09 2006, 01:22AM
Location:
Posts: 617
Must be a bad design if he needs line powered fan while only running at 5bps. Funny this conversation hasn't come up sooner. This guy has been on ebay for a long time.
Registered Member #1153
Joined: Mon Dec 03 2007, 07:27PM
Location: Croatia
Posts: 213
Tom540 wrote ...
Must be a bad design if he needs line powered fan while only running at 5bps. Funny this conversation hasn't come up sooner. This guy has been on ebay for a long time.
Because he use too little heat sinks and probably fan is for safety. People run this coils for hours without stop and it just work
Banned on 3/17/2009. Registered Member #487
Joined: Sun Jul 09 2006, 01:22AM
Location:
Posts: 617
yeah you have a point. but hes tested it for hours according to his site. He should test to see if that fan is really needed if not would probably cut a lot of cost out. his heat sinks look like they are cut from a bigger heat sink.
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What is he using?
