Author Topic: Please help me in choosing a driver circuit  (Read 370 times)

Offline bogdan

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Please help me in choosing a driver circuit
« on: February 03, 2019, 10:06:21 AM »
Hello, i am new to this forum and i am searching for some answers, i build a secondary for my tc, It is build from 80cm of pvc pipe with 110mm diameter, magnet wire is 0,118mm...a lot of windings, top load 110mm aluminium pipe, primary 10 turns of 2.5mm copper wire, i made a slayer exciter circuit and found out it resonates at ~141kHz, now i am stuck at the question of how to drive it, any answer is welcome

Offline Mads Barnkob

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Re: Please help me in choosing a driver circuit
« Reply #1 on: February 03, 2019, 10:47:03 AM »
Hi bogdan and welcome to HVF

You have made a very high ratio secondary coil, that can hinder performance a bit, but do not worry too much about that now, you are on a learning path :)

Could you please post some pictures of your coil?

I would say you should start with a half-bridge steve ward mini sstc / sstc5: http://kaizerpowerelectronics.dk/tesla-coils/kaizer-sstc-i/ and when you have that working you can upgrade to a full-bridge version: http://kaizerpowerelectronics.dk/tesla-coils/kaizer-sstc-ii/

The SSTC is fairly simple in terms of driving topology and feedback, contains very few parts and will give you a fair spark length.

A DRSSTC is more advanced and here there  is many more fallpits if you are not familiar with Tesla coils in general, so a SSTC is a good place to start.
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline bogdan

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Re: Please help me in choosing a driver circuit
« Reply #2 on: February 03, 2019, 12:28:29 PM »
here are some photos, i checked the schematic, and i ca't find the UCC37322 and UCC37321, can you please provide some similar ic that are easier to find?
 

Offline Laci

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Re: Please help me in choosing a driver circuit
« Reply #3 on: February 03, 2019, 04:11:19 PM »
Search for TC/MCP/MIC preffix parts like the TC4429,just make sure you have one inverted and one non-inverted version,with high output current capability and enable pin if you want to easily use an interrupter.
The second option is to use an NPN/PNP output stage,like this:



The secondary coil ratio is really high,as Mads said,with just under a 1:4 ratio secondary coil,the streamers were limited in my case,so had to wind a smaller secondary.

Offline bogdan

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Re: Please help me in choosing a driver circuit
« Reply #4 on: February 04, 2019, 07:06:37 PM »
The first schematic looks a lot more easier, i have tc4427, but it doesn't have the enable pin for the interrupter, so i still need some replacement options.

Offline bogdan

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Re: Please help me in choosing a driver circuit
« Reply #5 on: February 05, 2019, 09:55:04 AM »
So i woke up this morning, i am free from work, and what can i do better that online searching, among replacement for the ic i am missing. I found out that i can do better with my slayer exciter circuit, with a mosfet and a mosfet driver. I had lying around an irfp150n and a tc4427, said and done, grabbed my breadboard, and started doing stuff. I decided that i will power the ic from a 5v battery power pack, so i did, the + from power supply, and from the power bank i connected together. At around 8 volts it draws about 1A, and at 12V about 3A, happy about it, grabbed a screwdriver and made about 1 cm of arcs, turned on my oscilloscope, and i realized 2 things happened
1-the frequency dropped
2-i forgot to turn on the battery pack
i turned on my battery pack, the power draw went down, and the sparks were gone
wo power bank

with power bank

now, i don't know what happened, but i would like for someone to explain.

edit: aparently, idk how to insert links here...
« Last Edit: February 05, 2019, 12:32:47 PM by Mads Barnkob »

Offline Teravolt

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Re: Please help me in choosing a driver circuit
« Reply #6 on: February 05, 2019, 03:11:53 PM »
4046 drivers can be dificult to use and you should have a solid 12 and 5v reglated supply to start this so you can rule it out.
a simlpe 7812,7805 could be built. even some ebay power supply or switcher will do. do you have a picture of your circuit

Offline bogdan

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Re: Please help me in choosing a driver circuit
« Reply #7 on: February 06, 2019, 03:27:39 PM »
yes, this is the circuit

Offline bogdan

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Re: Please help me in choosing a driver circuit
« Reply #8 on: February 20, 2019, 03:20:24 PM »
So i decided to go with a half-bridge steve ward mini sstc, after a lot of reading and reading, i still have a few questions
-is it ok to use polyester caps for the 100nF including the one right before GDT?
-is there some way to test the permeability of the GDT (i saw a lot of problems regarding this one)

The rest of my components are on their way, so only waiting now.

Offline Mads Barnkob

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Re: Please help me in choosing a driver circuit
« Reply #9 on: February 21, 2019, 09:37:55 AM »
Both polypropylene and polyester have about the same properties when it comes to be used as coupling/DC blocking capacitor. So yes you have use a polyester capacitor, only disadvantages

Testing a GDT could be done from these two resources, albeit it might be easier to just order a suitable core. http://thedatastream.4hv.org/gdt_index.htm and http://www.richieburnett.co.uk/temp/gdt/gdt2.html
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline bogdan

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Re: Please help me in choosing a driver circuit
« Reply #10 on: February 21, 2019, 06:41:27 PM »
ok, thank you very much, i will wait for my components, and keep you updated :)

Offline L_Mangold

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Re: Please help me in choosing a driver circuit
« Reply #11 on: Today at 02:40:13 AM »
Hi bogdan, I'm new to this forum as well. I started building solid state circuits for Tesla coils about a year ago, but for GDT's, I have had good experiences with EPCOS toroids made from type n30 material and cat 5 wire, as well as commercially available pre-wound transformers like 673-PH9400233ANLT from Mouser.

If you do end up winding a smaller secondary, the slayer resonator circuit you were using is where I started as well. The power supply I used was just a mid-sized 60hz iron core transformer, bridge rectifier and electrolytic as a bare bones unregulated supply.

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Re: Please help me in choosing a driver circuit
« Reply #11 on: Today at 02:40:13 AM »

 


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