Winding a MOSFET gate circuit transformer for a 4046 PLL SSTC / Tesla Coils / Forums

Forums

4hv.org :: Forums :: Tesla Coils

« Previous topic | Next topic »

Winding a MOSFET gate circuit transformer for a 4046 PLL SSTC

previous 1 2 3 next

Move Thread

LAN_403

Justin

Sat Aug 29 2015, 07:07AM

Registered Member #46164 Joined: Wed May 07 2014, 08:16AM
Location: California, USA
Posts: 89

tarakan2 wrote ...

Halfdead wrote ...

tarakan2 wrote ...

What GDS toroidal core is used in this project:

"Its a N30 material ferrite toroid, properly around 30 mm in outer diameter. Find one with a permability above 4000."

Read the page comments, you can find lots of information there.

I read it but is it a circuit author who is answering? Is permeability more important or uH/turns?

The toroids on DigiKey with permeability of 4000 are expensive, large and it looks like they aren't for GDT purposes.
Why are there so many circuits that use GDT and so little informetion about how to choose ferrite cores for them?

Thank you.

Mads Barnkob is who replied, he's the author of that website, he's also a moderator on here who goes by the same name.

The webpage I linked to earlier in this thread has all the information you would need on this subject.

tarakan2

Sat Aug 29 2015, 08:12PM

Registered Member #3859 Joined: Sun May 01 2011, 03:47PM
Location:
Posts: 179

495-3860-ND I bought this toroid from digikey
thank you for advice.

tarakan2

Wed Sept 09 2015, 07:00AM

Registered Member #3859 Joined: Sun May 01 2011, 03:47PM
Location:
Posts: 179

I received the toroid and I am holding it in my hand.
There are dots on the transformer in the circuit diagram.

Do I wind all coils in the same direction?
Do dots indicate how I hook it up or how I wind it?

I saw that some are wound with three wires at once (for a 10:10:10) ratio. Is that how I should wind my transformer?

I am afraid that two MOSFETs will open at once and burn everything.

GrantX

Wed Sept 09 2015, 09:02AM

Registered Member #4074 Joined: Mon Aug 29 2011, 06:58AM
Location: Australia
Posts: 335

The dots in the schematic represent the phasing of each winding. The easiest and "best" way to wind a GDT is to first twist all your conductors together and then wind all 3 (or 5 for a full bridge) coils at once with your twisted trifilar wires.

Once all your coils are wound in the same direction, you will need to ensure the phasing of each coil is correct at the gates. This part is pretty easy: Lets say you connect end A to the high-side gate, and end B to the high-side source. For the low-side device's coil simply connect end B to the gate and end A to the source. Now one coil is wired in "reverse" compared to the other, so one gate will be seeing a positive voltage relative to it's source while the other swings negative.

tarakan2

Tue Sept 22 2015, 11:28PM

Registered Member #3859 Joined: Sun May 01 2011, 03:47PM
Location:
Posts: 179

Thank you for explaining about how to wind the transformer.

MEDIUM

So for 120 volt operation I can replace the rectifier diode in this 230V circuit with a full bridge rectifier?

Justin

Wed Sept 23 2015, 04:27PM

Registered Member #46164 Joined: Wed May 07 2014, 08:16AM
Location: California, USA
Posts: 89

tarakan2 wrote ...

Thank you for explaining about how to wind the transformer.

MEDIUM

So for 120 volt operation I can replace the rectifier diode in this 230V circuit with a full bridge rectifier?

Yes

nzoomed

Wed Sept 23 2015, 11:23PM

Registered Member #54503 Joined: Sun Feb 22 2015, 10:35PM
Location: New Zealand
Posts: 288

This is a very interesting thread indeed as i was going to just start a thread about winding my GDT using cat5 cable, and i too was concerned about phasing as i expect there would be serious consequences if both sides of the bridge were out of phase.

Im using 2 cm300 series modules with this schematic, im not too sure how to work out how to detirmine the "top" and bottom of each winding on the cat5 cable.

Is there any articles on constructing these? I cant find much info, from looking at the photos i assume you just tie each coloured pair together?
ISSTC Sch2

dexter

Thu Sept 24 2015, 05:59AM

Registered Member #42796 Joined: Mon Jan 13 2014, 06:34PM
Location:
Posts: 195

nzoomed wrote ...

Is there any articles on constructing these? I cant find much info, from looking at the photos i assume you just tie each coloured pair together?

GrantX

Thu Sept 24 2015, 07:00AM

Registered Member #4074 Joined: Mon Aug 29 2011, 06:58AM
Location: Australia
Posts: 335

dexter wrote ...

nzoomed wrote ...

Is there any articles on constructing these? I cant find much info, from looking at the photos i assume you just tie each coloured pair together?

Combine that video with this website and you should have everything you need:

tarakan2

Mon Sept 28 2015, 01:22AM

Registered Member #3859 Joined: Sun May 01 2011, 03:47PM
Location:
Posts: 179

So what do those dots mean?
If I see a dot on the bottom of a transformer symbol in schematics, then that means that I need to flip the polarity?

If !C goes to G1, does 1B or 2B go to G2?

I am really afraid to burn this circuit. Thank you.

I didn't twist my wires. I don't want to because my wires are solid and aren't very flexible.

Thank you.

previous 1 2 3 next

Moderator(s): Chris Russell, Noelle, Alex, Tesladownunder, Dave Marshall, Dave Billington, Bjørn, Steve Conner, Wolfram, Kizmo, Mads Barnkob