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Topics - oneKone

Pages: [1]
1
Dual Resonant Solid State Tesla coils / Drsstc 4 (new direction)
« on: October 07, 2019, 02:57:57 AM »
Ok....
Originally I was going to document my 4th drsstc, but thinking about it I don't really see the point of another small simple drsstc build. I'm still going to build it, just in the background.

So the coil I'm planning on building!

The secondary form is being donated by a "mining" company. It's 230mm diameter with a fibreglass construction. I'm thinking of a 1:5 ratio which will make the length 1150mm, with a wire diameter of 23awg (temco wire diameter is 0.63 with polyurethane coating).

The MMC will be the same as the capacitors I used in my drsstc 3, expect in a 4p X 4s configuration for overhead.

The bridge, after much hesitation will.be skm400gb-12x. I'm not sure with 124, 125 or 128 as of yet.

I still have a lot to figure out and this is very much early days. This will be the largest drsstc I can build at my house, I'll be right on the limit of the 25a outlet I have.

 My basic plan is to get one part of the drsstc each month. Hopefully by the end of this month or the start of next I'll have the secondary wound. The cost of parts when you go large is pretty daunting...

2
Electronic circuits / Differences with AliExpress irfp460
« on: April 30, 2019, 08:16:20 AM »
In my absence form drsstc I've been getting into standard sstc and flyback drivers. This lead me to try different vendors on AliExpress for MOSFETs.  So far I've tried 3 different vendors with mixed results. All tests are 20v at the gate.
Type 1: tested upto 1.7kw (dual h-bridge), 1kw dual half bridge
Type 2: failed at 1kw dual half bride. Smaller die size is the suspect
Type 3: completely useless, appears to have smaller package in silicon.

Pictures are in order type 1-3





(ATM this post may seem fragmented, will update tonight)

3
Solid state Tesla coils / 160mm PLL sstc
« on: August 28, 2018, 03:32:40 AM »
I've decided to build a PLL sstc while saving for my drsstc build.

For a while now I've wanted a big-ish CW sstc, so I've decided to pull the 160mm secondary off the shelf I used for my second sstc. For the driver I'll be using this: https://www.mikrocontroller.net/attachment/284427/U3RBsZAI.png

One question I have is how to tune it! On pins 11/12 I have 10k resistors with 50k pots so I can easily set the lower and upper frequency limits.... But I think that's where I get confused!

I've read that I set the upper and lower limits by adjusting the vco pot. So by turning the vco pot all the way in one direction set pin 11, then turn the vco in the other direction and set pin 12, then finally fine adjust the frequency with the vco to get a perfect waveform (or as close as possible) on the output of the bridge. So basically if I had a secondary with a fres of 170khz the upper limit would be 190khz and the lower 150khz and the vco would be tuned to 170khz.

Hopefully I haven't made a total mess of the paragraphs and it can be understood! The problem with things like this is I read too much into it without getting an understanding and just end up getting more confused!

4
Having no option but to put my drsstc build on hold i still wanted to work on a high voltage project, but remain cheap at the same time. I've had a few flyback cores sitting for a long time so i decided to make use of one of them. i was looking online when i saw the internals of a flyback (how it was wound) so i thought i'd give it a go.

for a driver i'm using mads circuit except rather than using max4420 i'm using a ucc37325 and 2 pairs of irf9540/540 to handle the switching. The igbt of choice is what i had laying around..... a cm300 

 the OD of the bobbin is 40mm with a winding depth of 7.5mm, this should give 225 turns per section but it was wound by spinning a drill and getting the wire to go from left to right within the section. So as a pure guess i'm going to say the amount of turns would be in the 1500 range. The first bobbin i tried didn't have enough of a wall between the core and the windings as well as i didn't give the oil long enough time to penetrate, this resulted in a very short life. The next bobbin wall thickness was increased by 2.5mm and the oil was given 8hrs to penetrate. this is the current bobbin i am running now. The oil i'm using is synthetic engine oil.

I think the next step would be to get a cheap vacuum pump and epoxy the next bobbin rather than oil. 

/>





5
Dual Resonant Solid State Tesla coils / Drsstc 3
« on: March 26, 2018, 04:13:08 AM »
While my second drsstc is on hold i thought I'd start trying to design another drsstc. The two coils I'm thinking of are:

110mm diameter, 440mm winding length, 0.3mm wire, 1460 turns. As for the bridge I was thinking about a full bridge of 82N120. Eric Goodchild wrote that 82N120 can run at the same frequency as the ixgn60n60. I'm thinking of using the 82n120 so I can go up to 600v bus.

Or

160 diameter, 640mm winding length, 0.3mm wire, 2130 turns.
With a fullbridge of cm300du-24.

As for the driver I'm on the fence to go with a 1.3b or an 2.7c driver, especially because I have an unpopulated 2.7c board, or if there's a point when  phase shift should be added to a coil,  at what point it's necessary. I'm hoping someone could maybe provide some insight with these more larger coils.



6
Dual Resonant Solid State Tesla coils / Micro drsstc
« on: February 27, 2018, 03:19:48 AM »
After completing a version of mads drsstc ii I've now caught the drsstc bug! So time to get building a new one.

The secondary was originally wound for a sstc but the fres seems low enough for a small to-247 half bridge setup, in which i'll try some 60n60 igbts from aliexpress.

current actual/ calculated specs;

Secondary: 76 mm od, 129 mm long, 104 mm winding length, 0.13mm wire, about 800 turns
Topload: 160mm diameter, 40mm high spun aluminium toroid. Secondary and toroid give 370khz
Primary: aiming for 7 turns of 3.2mm copper tube tapped at 4.8 turns
Primary resonance capacitor: 47nf  Cornell-Dubilier Polypropylene 3kv
Full bridge of to-247 60n60
Driver: a steve ward 1.3b variation from ebay
___________________________________________

One thing i might try is to wind a dual? 1:33:33 ct using 3 epcos n30 ferrite rings (https://au.rs-online.com/web/p/products/2120982/). something similar to loneoceans drsstc 3 ct arraignment. The last time i ordered one of these driver it took quite a long time to get here. so potentiality this project could appear to be abandoned, in reality it would be me waiting for parts to arrive. 

core to the left*





7
General chatting / Ideas needed!
« on: February 25, 2018, 07:31:40 AM »
hi,

i recently picked up a decommissioned mig welder from a mate. he said for some reason the case and handle was missing but the internals are all still good. so it got me thinking.... what could i use these cores for? i'm thinking as an inductor for a boost converter?  being a mig welder it would just be a big step down transformer with most likely a 12-40v output at 80 amps. 


8
Solid state Tesla coils / Mini tesla
« on: February 11, 2018, 09:24:43 AM »
So because I'll have to wait another week or two for some igbts I thought I'd make another Tesla coil! This one is 75mm diameter and about 115mm in winding length, so about 885 turns. The secondary still has some sanding and coats of polyurethane to be applied but hoping to get it finished by the end of the week. It will use an existing sstc driver and a simple irfp460 halfbridge.

 As for the topload I think I'll use this 150mm diameter one and order a 200-250mm diameter to replace the one for my drsstc.

9
Solid state Tesla coils / sstc drive method
« on: January 04, 2018, 03:52:45 AM »
hey,

every now and then when i run my "big" sstc and occasionally blow some igbts, other times it works flawlessly. the problem is the breakout point and antenna needs to be positioned perfectly or else i start to have drive issues, essentially cutting out. 

so it got me thinking.... would it just be better to convert it to a pll driver and still interrupt it using the enable pins of the ucc3732x drivers.

any help is highly appreciated.

cheers.

10
With my drsstc project on the horizon I had to start thinking about the driver. I've seen many rev 2.7c boards and the awesome through hole 1.3b board mads has created, but one thing I haven't seen are many Chinese boards being used.

My overall goal for this thread will be to have different Chinese driver boards so people can basically have another option without completely buying in the dark.

I've just ordered this board to test after I build my drsstc. If all goes well I'll order different variations and see how they go.

Link to the first board:
 http://s.aliexpress.com/viAVr6Vb

11
General chatting / subcooledheatpump YouTube channel
« on: October 05, 2017, 02:15:30 PM »
I've just come across a YouTube channel called "subcooledheatpump"  i haven't watched a great deal of he's videos but from what i have watched they are extremely informative. it's worth a visit i think.

link to he's channel: https://www.youtube.com/user/subcooledheatpump
 

12
Dual Resonant Solid State Tesla coils / My first drsstc
« on: September 21, 2017, 05:14:54 AM »
So I'm already thinking of my next coil and I think it's time to tackle a drsstc. I still have a stupid amount to learn so I was going to start with something basic.

The two drivers I'm looking at are oneTesla and Steve wards sstc 5 for simplicity. I know people recommend the ud driver but to start with I'd rather build my own (still copying someones design) and learn from it. As for the secondary I was going to go with the kaizer drsstc ii.

The two drivers circuits:
http://onetesla.com//media/wysiwyg/downloads/tsschem.png
https://www.stevehv.4hv.org/DRSSTC-.5/DRSSTC-.5sch.JPG

13
Electronic circuits / Estimating spark length voltage
« on: September 06, 2017, 02:29:57 AM »
Hey,
A while ago (about 7 years) I read somewhere that a general rule of thumb for estimating a spark length is 1kv for 1mm. I've been blindly using this concept without actually looking into it. I've tried to find some answers but it seems my Google skills are not upto the task!

So basically the question is, is 1kv equal to 1mm or is this far from accurate....... I'm equating my 400mm spark length on my sstc is 400kv.

Cheers,
Chris

14
Solid state Tesla coils / My 160 (?)mm sstc
« on: July 26, 2017, 11:02:43 AM »
So I think it's time for my next coil... I'll be using the same basic driver everyone uses (22/21 pair) except the one thing I'm not sure of is to buffer the interrupter signal through the same 74hc14 as the antenna buffer or use a seperate chip to reduce on interference (this is an absolute guess)

My local hardware shop sells 150mm PVC pipe (I'm guessing around 160mm od) so I'm thinking about 450mm wind length using 30awg wire I have laying around, with this I should get about 1500 turns (the wire measures 0.3mm).

For the inverter I was going to go with a 40n60 fullbridge as I've ordered some igbt from AliExpress and am keen to see what they go like.

This coil is really just to use up the existing wire I have before I order more..... Any criticism is welcomed.

15
Solid state Tesla coils / My sstc 1 build log
« on: June 25, 2017, 10:07:30 AM »
After a few small zvs drivers and extremely simple sstc's I wanted to make a proper sstc. I saw loneoceans sstc how-to guide and that inspired my driver (essentially based off his)

Because of work the progress will be slow but hopefully steady. The main two things I've accomplished this weekend have been designing/routing the control PCB and mocking up the interrupter on a breadboard, which is based on one Tesla's as interrupter. I'm currently drawing the interrupter to be as a shield for the Arduino Uno.

Hopefully I get some time during the week...



16
General chatting / Hi from Australia
« on: June 23, 2017, 02:37:24 AM »
Hi,
I thought I'd introduce myself before posting away!

I was referred to this forum by an eBay member that I bought a universal drsstc driver board from. I've been involved in electronics for a couple of years now but am very much still a beginner.

I've built one very basic sstc but am starting on my first "proper" driver this weekend. It will be  based around the 74hc14 and a ucc27425.

I look forward to learning from other members and hopefully oneday help others.

Cheers,
Chris

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