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1
Transformer (ferrite core) / Re: Homemade flyback on 60N60DLF full bridge
« on: February 12, 2019, 09:17:29 PM »
Hi Mads, I work in welding/engineering and I can take home old disused welding equipment so I took a few welding inverter boards and "remanufactured" them into a power bridge for my flyback and I guess they would make a powerful induction heater too, this uses sd6835 and I added 4 60N60DLF IGBTs

/>
This board uses current mode control in the new video terrible build quality though as that's all I had on hand  :-*

Hard to see the arcs but massive current as alot of UV being emitted I can stretch them too 2 feet when done fast


2
Transformer (ferrite core) / Homemade flyback on 60N60DLF full bridge
« on: February 10, 2019, 08:36:12 PM »
Hi guys as we all love arcs I thought I'd share a video of my homemade flyback running at about 3Kw from a isolation transformer off a full bridge of 60N60s

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Excuse the M10 bolts  ;D I lashed it up quick to see some arcs

3
Electronic circuits / Re: Chinese DRSSTC driver woes...
« on: February 05, 2019, 05:51:13 PM »
Yes I found out that it is, the other identical boards use NE555 from Texas Insutruments, so I've ordered the same ones in the same package SOIC8, the left hand 555 gets very hot I saw arcing from the strong RF output of the coil which was close by

4
Electronic circuits / Re: Chinese DRSSTC driver woes...
« on: February 04, 2019, 07:53:07 PM »
I see, ohh well I guess mine will go in the bin.

I get nothing at any input voltage

Well modulation is working as i can hear the tone changing when I change frequency potentiometer (the one you turn in the video) by checking the diode by the feedback ct



Got it working, bad SMD capacitor on the back, now an IC has shorted I will replace it

Any idea what this IC Is? Boards says 555 under it

5
Electronic circuits / Re: Chinese DRSSTC driver woes...
« on: February 04, 2019, 02:20:33 PM »
I don't think it uses 555, only 74hc08 and 74hc14, does yours work on less than 150vdc?

6
Electronic circuits / Re: Chinese DRSSTC driver woes...
« on: February 04, 2019, 01:57:52 PM »
Thank you, yes I have changed feedback, also I only have 95v power supply, and there are 2 LEDs orange and blue but the blue one never illuminates, does yours? On less than 150vdc

7
Electronic circuits / Re: Chinese DRSSTC driver woes...
« on: February 04, 2019, 01:26:04 PM »
Just checked them they are okay, none of the ICs get warm too but the 5 and 9v regulators are working

8
Electronic circuits / Re: Chinese DRSSTC driver woes...
« on: February 01, 2019, 06:07:37 PM »
I was hoping that many Tesla enthusiasts would jump in on this one.  I haven't played with a Tesla coil since 1956, so I know  nothing.
But----  Isn't that little toriod  that is hanging off the side of the board supposed to be the "feedback" element?  Shouldn't the power wires or something make one turn through it, as in one of the pictures show in the "details" link in the aliexpress ad?
  I attempted to add a picture of the feedback setup on their earlier model, but I don't see it here.

Hi Pete, thanks for the reply as I thought at least a few would give me some pointers, yes that toroid is a feedback CT which uses the ground side of the secondary coil to sense frequency and I assume the control circuitry locks the coil in time by continually adjusting to it, I have also checked the full bridge and half the bridge is seeing input voltage and the other half just over 2 volts (input was 70)

I really don't know what's going on as the board seems fine, I've also tried flipping the feedback but nothing, surely there would be some output even if the feedback wasn't used, no output at all

9
Electronic circuits / Chinese DRSSTC driver woes...
« on: January 31, 2019, 09:03:59 PM »
Hello everybody, recently I purchased a Chinese DRSSTC driver from AliExpress, 10days later I recieved it. I'm am sure it is faulty and wondering if anybody can help find the fault. There is no oscillations at all with various primary coils, I have checked the voltage regulators for the drive ICs so far and are correctly working, supply voltage is up to 311v and the seller recommends a variac rectified with stleast 2kw output. I have so far tried up to 90v (seller says 40v produces 30mm arcs, 150v 300mm) 90v is supplied by a boost converter and the full bridge of 500v 20a FETs don't pull any current, even when disconnected the capacitors from my boost converter don't even drain so no current pull at all

Any recommendations as to find what's going on? Thanks

https://www.aliexpress.com/i/32913086209.html

10
Solid state Tesla coils / Re: SGTC secondary used in SSTC mode?
« on: January 24, 2019, 08:24:49 PM »
Sounds like a reasonable secondary for a (DR)SSTC - you'll want to use reasonable fast IGBTs as it I estimate will resonate around 200-250kHz with a sensible size topload, but good TO-247 IGBTs should handle it OK (try FGY75N60SMD/FGA60N65SMD/FGH60N60SMD). There are some designs in this forum which could get you started with a full bridge PCB (order from a cheap chinese PCB house), and for a driver you could again use a design found here or get something off ebay/aliexpress (again, check the forum for reviews and options).

As you didn't mention having a toroid already, as an option I am happily using one of these with a secondary of the same 110mm diameter: https://www.ebay.co.uk/itm/Spun-Aluminium-Toroid-for-Tesla-Coil-HV-High-Voltage-300mm-by-75mm/113538948995
For that price it's not worth trying to DIY one! (Note comes in 2 halves, to hold it together either use the mounting bolt or roughen up the flat area on the inside and epoxy together).


Hi Hydron, thank you for the detailed and helpful reply, if I remember from JavaTC inputs the Fres was about 234khz, I have some spare 60H60 trench gate field stop IGBTs leftover from another full bridge build I done which is used to power a homemade flyback, I have had a look at the Chinese drivers but I am struggling to come to conclusion which one would be most appropriate as all the descriptions are meaningless to me, if I post a few could you help me make a decision?

As for the toroid, luckily I work in engineering and could have one made to spec for free, thanks for the heads up though.

Thank you 👍

11
Solid state Tesla coils / SGTC secondary used in SSTC mode?
« on: January 24, 2019, 05:29:44 PM »
Hello HVF, recently I made a secondary coil using 110mmOD drain pipe, 0.24mm wire with about 1200 turns, height diameter ratio is about 1-4 as I originally intended to use it as a medium sized SGTC of around 3kw. Now I'd like to use it in solid state mode and was wondering if I could use it at all and would I run into any problems?

Also as a additional question is there any decent full bridge driver I could buy as I'm struggling for time to build one as I have a newborn daughter

Thanks in advance


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