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Registered Member #125
Joined: Fri Feb 10 2006, 01:52PM
Location: Aalborg, Denmark
Posts: 155
Hi All,
It's been a while since my last post, I have been stressed at work, as I now design mechanical parts for robots and satellites at Aalborg University.
But I am now in to coiling again:-)
The DRSSTC I made is at a children's fare at the University now, and it has passed some EMI tests today, with no comments at all! So I´m really happy about the results, as I used over two months building the darn cage and coil:-)
Registered Member #570
Joined: Wed Mar 07 2007, 03:41PM
Location: Winchester Uk
Posts: 42
Hi Finn and Daniel,
I like your predikter circuit. It looks like a very sound design, and you have great results!
You could take the output of your precision rectifier and feed it into an RMS-DC converter with long time constant and then have a measure of the RMS current in your primary which could be interesting.
One thing I was not sure about was running the gate drivers from a signal with different timings for each driver. Do these not drive a gate drive transformer? I would have thought that you would want them both to change at the same time if driving a GDT. Or is the additional delay in the dead time circuit to prevent shoot through or something? I think I must be missing something.
Registered Member #205
Joined: Sat Feb 18 2006, 11:59AM
Location: Skørping, Denmark
Posts: 741
Paul Benham wrote ...
Hi Finn and Daniel,
I like your predikter circuit. It looks like a very sound design, and you have great results!
You could take the output of your precision rectifier and feed it into an RMS-DC converter with long time constant and then have a measure of the RMS current in your primary which could be interesting.
One thing I was not sure about was running the gate drivers from a signal with different timings for each driver. Do these not drive a gate drive transformer? I would have thought that you would want them both to change at the same time if driving a GDT. Or is the additional delay in the dead time circuit to prevent shoot through or something? I think I must be missing something.
Cheers,
Paul.
Paul,
Thanks for your kind comments. About the RMS circuit: Yes, sounds interesting, and would be nice with another meter on the front of the controll box. The deadtime does not work with the gate transformers, as you noted. Deadtime was a leftover from the revision where optocouplers were used, but they were postponed for later refinement.
Registered Member #2750
Joined: Sun Mar 21 2010, 08:47PM
Location: Poland
Posts: 46
Hi Finn and Daniel,
I woud like to pass a question about your drive. I recently build my first DRSSTC using clasical Steve's driver. I have a problem with IGBT failures. I think that the reason is ringing and spikes on IGBT. I want to try use predikter to solve this problem. Daniel hanged supply voltage for UCC drivers from 5 to 15V and I want to do the same thing in my predikter but I would like to know from where did you get 15V ? I think it is possible to use 15V from supply for analog section (AD790 and LM7171) but I fear if this does not adversely affect the work of this part of the circuit. Resonant frequency of my secondary is about 60kHz power consumption is about 5kW. I need to make accurate measurement but it is not at this moment the most important.
Registered Member #205
Joined: Sat Feb 18 2006, 11:59AM
Location: Skørping, Denmark
Posts: 741
mmt wrote ...
plz... the link is broken, cant wait to see it
I will try to locate .BRD and :SCH files for re-upload. You know how it is: new PC's, not too well backed up structure, but it is there somewhere, if only I could remember...
Registered Member #2750
Joined: Sun Mar 21 2010, 08:47PM
Location: Poland
Posts: 46
Changing the PCB is not a problem for me. I have the original designs of predikter from "Thumper" thread (btw. tkis is the most amayzing tesla project I've ever seen ). I just know if what I want to do: get 15V for UCC drivers from AD790 supply will not cause any undesirable effects as the transfer of interference by the power rails or other bad things that could cause incorrect operation of sensitive comparators. I'm not so good in designing analog circuits.
Registered Member #205
Joined: Sat Feb 18 2006, 11:59AM
Location: Skørping, Denmark
Posts: 741
Dzejwor wrote ...
Changing the PCB is not a problem for me. I have the original designs of predikter from "Thumper" thread (btw. tkis is the most amayzing tesla project I've ever seen ). I just know if what I want to do: get 15V for UCC drivers from AD790 supply will not cause any undesirable effects as the transfer of interference by the power rails or other bad things that could cause incorrect operation of sensitive comparators. I'm not so good in designing analog circuits.
Well that's easy, then. Feel free to tap into the 15V supply, to feed the UCC drivers. Remember to add generous decoupling next to UCC's.
Registered Member #2750
Joined: Sun Mar 21 2010, 08:47PM
Location: Poland
Posts: 46
I changed the design today. UCC now are powered from 15V. There was one new small track on the top layer. I asked for the review and any comments if I did something wrong. I would like to order board for my coil in PCB company - I tried to eth them at home but I have a big problem with drilling small pads. Project is here
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Hammertone "Predikter", the DRSSTC driver for the rest of the century.
