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Does this look like it would work? (My first SSTC)

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Tom540

Sun Dec 16 2007, 07:29PM

Banned on 3/17/2009.
Registered Member #487 Joined: Sun Jul 09 2006, 01:22AM
Location:
Posts: 617

I would say that little toroid might be okay for a gate drive on a small sstc. I have a big H-bridge board from work that uses little toroid transformers for its gate drive and they are 17mm OD. They only have 6 turns trifilar on them and run at 100KHz. I think you'll just have to experiment. Just use thicker wire.

HDR

Tue Dec 18 2007, 07:51PM

Registered Member #1165 Joined: Sun Dec 09 2007, 04:41AM
Location: GA, USA
Posts: 35

How critical is the value of the 470nF capacitors? I just realized I ordered the wrong part, and I can't get the 470nF locally. And what voltage rating is required for that cap? I can get some 250V 1.0uF caps easily.

Marko

Wed Dec 19 2007, 12:09AM

Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145

You guys definitely overkill regarding toroid core size - power is there tiny, and it's just the matter of fitting enough wire through it with good insulation.

I used 5 turns of mini coax cable on a tiny 10mm OD, 4mm tall toroid from CFL lamp and it worked well.
I later used a larger toroid just to fit better insulated wire in it, and that one is a 15mm OD and like 15mm tall.

The huge toroids like you guys use are hard to come by here, anyone who has them saves them for power transformers (usable for 100's of watts at frequencies we use them in SSTC's).

DRSSTC's driven with 30V need double secondary turns so larger core must be used, or two smaller separate transformers. and etc.

I also notice too much of you use a way overkill numbers of turns - make sure you calculate the minimum number of turns by following thedatastream's site. Apart from being able to use smaller core you'l have better performance!

Tom540

Wed Dec 19 2007, 01:24AM

Banned on 3/17/2009.
Registered Member #487 Joined: Sun Jul 09 2006, 01:22AM
Location:
Posts: 617

Marko wrote ...

You guys definitely overkill regarding toroid core size - power is there tiny, and it's just the matter of fitting enough wire through it with good insulation.

I used 5 turns of mini coax cable on a tiny 10mm OD, 4mm tall toroid from CFL lamp and it worked well.
I later used a larger toroid just to fit better insulated wire in it, and that one is a 15mm OD and like 15mm tall.

The huge toroids like you guys use are hard to come by here, anyone who has them saves them for power transformers (usable for 100's of watts at frequencies we use them in SSTC's).

DRSSTC's driven with 30V need double secondary turns so larger core must be used, or two smaller separate transformers. and etc.

I also notice too much of you use a way overkill numbers of turns - make sure you calculate the minimum number of turns by following thedatastream's site. Apart from being able to use smaller core you'l have better performance!

I agree Marko, the only problem is if you don't have the specs on the core you're going to use you cant calculate anything you have to just experiment and use your best judgment. I dropped my standard 15 turns down to 7 which could still be overkill since my cores are about 1.2" OD.

uzzors2k

Wed Dec 19 2007, 10:06AM

Registered Member #95 Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308

You can make assumptions and measurements. For most ferrites flux density should be between 0.2 and 0.3T, and cross-sectional area only takes basic math to calculate from measurements. You'd be surprised how few turns you can get away with, I sometimes want to add more just to make the GDT look better.

HDR

Fri Dec 21 2007, 03:36PM

Registered Member #1165 Joined: Sun Dec 09 2007, 04:41AM
Location: GA, USA
Posts: 35

This is driving me crazy... I have a second order of 2 or 3 parts, including my MOSFETs that was shipped out on the 10th, its been 11 DAYS!! and its still not here

they better not have lost my most expensive package...

Ultra7

Fri Dec 21 2007, 04:31PM

Registered Member #1157 Joined: Thu Dec 06 2007, 12:11PM
Location: Houston, TX
Posts: 307

Bah, prolly just Santa's elves jambing up the shipping lanes with presents for the good lil boys and girls.

Steve Conner

Fri Dec 21 2007, 04:45PM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

Congratulations, you win this year's Most Useless First Post award. Welcome to 4hv.org!

Ultra7

Sat Dec 22 2007, 01:52AM

Registered Member #1157 Joined: Thu Dec 06 2007, 12:11PM
Location: Houston, TX
Posts: 307

Egad!
It's December 21st and close to the end of the year, and mine is the worst?
I was just trying to be funny.

HDR

Sat Dec 22 2007, 09:37PM

Registered Member #1165 Joined: Sun Dec 09 2007, 04:41AM
Location: GA, USA
Posts: 35

Looks like the project is going to be delayed until after christmas, since the post office seems to have lost my parts, that were supposed to be here A WEEK AGO

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