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4hv.org :: Forums :: Tesla Coils
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need help about GDT winding
Move Thread LAN_403
raff
Sun Jan 31 2010, 11:34PM Print
raff Registered Member #2315 Joined: Tue Aug 25 2009, 02:35AM
Location: Leyte, PH
Posts: 161
 		guys,

winding a 1:1:1 is EASY cheesey

but HOW do you PROPERLY wind a 1:2:2?

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101111
Mon Feb 01 2010, 09:11AM
101111 Registered Member #575 Joined: Sun Mar 11 2007, 04:00AM
Location: Norway
Posts: 263
 		If 1 = 10 turns then 1:1:1 will be 10:10:10.
If 2 = 20 turns then 1:2:2 will be 10:20:20
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raff
Mon Feb 01 2010, 09:54AM
raff Registered Member #2315 Joined: Tue Aug 25 2009, 02:35AM
Location: Leyte, PH
Posts: 161
 		I know... ;D

but how is it wound ?
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Steve Conner
Mon Feb 01 2010, 10:19AM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
 		A way to do it with low leakage inductance is:

Wind a 1:1:1:1:1 with a bundle of 5 wires all twisted together

Series up two pairs of windings to get a 1:(1+1):(1+1) = 1:2:2

For still lower leakage inductance you can take a piece of Cat5 ethernet cable (8 cores) and wind it round a ferrite toroid. Identify the 4 twisted pairs of wires. One wire in each pair is a primary, and you parallel them up, to get 4 parallel primaries. The remaining four wires are secondaries and you can series two pairs of them to get a 1:2:2.

If you're going to such lengths to minimize leakage inductance, then all of the leads going from the transformer to the gate driver and FETs must be in tightly twisted pairs too.
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101111
Mon Feb 01 2010, 10:40AM
101111 Registered Member #575 Joined: Sun Mar 11 2007, 04:00AM
Location: Norway
Posts: 263
 		You should also look at these links for reference and some formulas:
Link2 Link2 Link2 Link2
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HV Enthusiast
Mon Feb 01 2010, 02:44PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
raff wrote ...

guys,

winding a 1:1:1 is EASY cheesey

but HOW do you PROPERLY wind a 1:2:2?



Easy.

Say your turns ratio is 10:20:20 which is a 1:2:2 transformer.

1. Take three strands of wire and twist them tightly together using drill or similar

2. Wind all three strands 10 times through the core.

3. At the tenth turn, pull out a small loop of the primary wire a few inches out.

4. Continue winding the three strands an additional 10 times.

5. Cut the loop that you previous pulled out. You now should have the primary divided into two equal sections of 10 turns each

6. Connected the (4) leads of the primary now so that that you have two 10T primaries in parallel. Be sure to have correct phasing. VERY IMPORTANT

7. Voila' You're done!

You end up with 10T//10T:20T:20T or a 1:2:2 transformer
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raff
Tue Feb 02 2010, 04:05AM
raff Registered Member #2315 Joined: Tue Aug 25 2009, 02:35AM
Location: Leyte, PH
Posts: 161
 		Hi Steve, Dan, 10111

thanks for the informative bits! cheesey

I finally managed to make one... 10primary (210uH) , 20T sec (around 800uH) x 2 with a leakage inductance of about 0.40uH.. I think its OK enough ...though I made it on a SMALLish TV flyback UU core..ferrite torroids (>1" OD)are VERY hard to come by...

some pics...

primary winding "bundled" whites..

1265083263 2315 FT83546 Img 3242


here is my core cheesey.. but it DOES work

1265083263 2315 FT83546 Img 3243


the secondaries

1265083263 2315 FT83546 Img 3244


its on my 2nd (soon to be DR) SSTC... secondary running on 218KHz with topload...
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