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Messages - Marty

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1
Dual Resonant Solid State Tesla coils / Re: Strange gdt waveforms
« on: May 10, 2019, 12:38:27 AM »
Hi and thanks,
Every scope is taken behind coupling capacitor. Picture in reply #10 is driver output without GDT connected.
Here is output signal (which is going into gate of 1 IGBT):


I had the same problem as you. You have two outputs (2 wires), but one of them is square wave and the other one is 0. This causes that your gdt core is doing these wierd things. Your driver must have both sides with square (of course phase shifted half cycle). But be careful when scoping this, you can short it with your osciloscope. Use diferential probe or measure one side between 0V potential on the board and then the second.

2
Dual Resonant Solid State Tesla coils / Re: Strange gdt waveforms
« on: March 18, 2019, 05:32:43 AM »
Sorry for double post but...

Its f***ing working !!!! my first DRSSTC.. after hundreds of hours and a lot of efort :D



1.8m long spark, OCD set to only 500A, 230VAC, CM300s are cold, but the coil need still tune a bit.

Thank you guys

3
Dual Resonant Solid State Tesla coils / Re: Strange gdt waveforms
« on: March 09, 2019, 04:24:45 PM »
It is working !
Problem was with LT1016 ultra fast compator. It has output Q and Q' (with negation). Q works normally, but Q' not. There was square wave, but only 1.92V. This goes into 74HC08 (AND gate), so I think it was not enough to be logical 1. And thats why UCC27423 wasn't switching two mosfets.  So I put 7404 invertor on Q and replace that Q'. And it works ! Update: On 74HC14 (hex schmidt invertor) there is one invertor unconnected, so I don't need another IO after all.


This is the driver output.

Today I'm going to test my IGBTs with some bus voltage and load to see real gate waveforms. Thanks for your advice,

4
Dual Resonant Solid State Tesla coils / Re: Strange gdt waveforms
« on: March 01, 2019, 04:48:39 PM »
@T3sl4co1l: No, its not that circuit. Its UD2.7C THT version (its written above second picture).
Here : * ud27-schematic.pdf

Next week I will post my results, thank you.

5
Dual Resonant Solid State Tesla coils / Re: Strange gdt waveforms
« on: February 26, 2019, 10:04:08 PM »
Thank you for your responses.
Yes, you were right. The driver output is only +24 and the other side is 0.
Its connected correctly, no wire to GND.
I checked all 4 mosfets and they are ok, so I think UCC27423 could be the problem. I will buy new one and post my results.

6
Dual Resonant Solid State Tesla coils / Strange gdt waveforms
« on: February 24, 2019, 04:08:35 PM »
Hi everyone,

My GDT is behaving very strangely, maybe I'm doing something wrong or maybe i have bad core material.
The core material is 3E25, AI=6900nH, dimensions are: 57.8 x 40.5 x 17.9 mm, cross section Ae=152.4 mm2, 14 turns of CAT5 wire)
When I plug my signal generator into GDT, this is the output on the secondary side (i think its not bad, maybe i should add some turns):


When I connect GDT into my driver (UD2.7C THT, which is working correctly), it behaves strangely. Gdt output with no load looks like this:


With 4,7 Ohms resistor across secondary, it looks like this:


What could be wrong ? Or should I try to connect it to my CM300s ?
I would be thankful for every information or help, thank you :)

7
Dual Resonant Solid State Tesla coils / Re: DRSSTC impedance
« on: July 13, 2018, 12:45:17 PM »
Thanks for your reply,
I didn´t buy the pipe yet because they dont have it (maybe some sign :D ).. so if the impedance is not that crucial, I will use 16x70cm and nice skeleton toroid which will also lower f and Z... Again, thank you for helping me with understanding this mystery :D

8
Dual Resonant Solid State Tesla coils / DRSSTC impedance
« on: July 12, 2018, 08:14:38 PM »
Hi everyone!

After a lot of reading, learning, doing calculations etc. I chose these specs for my medium DRSSTC:

Secondary coil: 20x80cm (8x32"), 0.5mm (24AWG), about 1454 turns, with toroid 81kHz and 48.5kOhm impedance (I want "smaller", but with low frequency about 70-80kHz)
I will be using CM300DY-24H, so I need low frequency to lower switching losses.
I wanted to use 16cm dia secondary, but the frequency will be a bit to high and if I use for example 0.35mm wire dia (27AWG) the frequency will be about the same, but impedance will be far away from "magic 50k".

But I saw other coilers (loneocans etc.) using 16x70cm secondary with 0.35mm wire (1850turns,f=80kHz, Z=61kOhm), so
I´m asking what is better, lower impedance (about 50k) or higher with more turns and more suitable h/d raito ?

Thank you for answers

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