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Registered Member #2591
Joined: Fri Jan 01 2010, 11:58AM
Location: netherlands
Posts: 76
Hi everybody, Im making a DRSSTC, and I have made an seconday of 4" diameter 20" tall with 36 AWG wire with a total of 3600 turns. the dc-resistence is 1.7 Kohm, can i use this coil, or is it better to make another one with thicker wire and less turns.
Registered Member #2390
Joined: Sat Sept 26 2009, 02:04PM
Location: Milwaukee Wisconsin
Posts: 381
I believe that will depend on the resonant frequency, and if you match it to that of your primary. Take into consideration your mmc as well. Download wintesla or javatc and punch the existing numbers in and go from there!
Registered Member #2591
Joined: Fri Jan 01 2010, 11:58AM
Location: netherlands
Posts: 76
I wanted the resonant frequentie verry low, that's why I wound this coil, but now I'm reading on the internet that i have to aim at +/-1000 turns, or is it different with drsstc.
I wan't to run this coil on the minibrute driver, but I have ordered the book so I think that I'm going to make the same secondary coil as well.
Registered Member #2390
Joined: Sat Sept 26 2009, 02:04PM
Location: Milwaukee Wisconsin
Posts: 381
Getting the book is a good idea, you will find some very critical information in there! As for the secondary in the book; it is 4.5" with a 12" winding of 30awg wire. Fres no topload is approx 297khz. Dans book is a great addition to any collection! I have both of his books and they are extremely usefull!
You can probably get away with this. Most DRSSTC coils use 1600 to 2800 turns. The main reason is to keep the res freq down to a value around 50-60 kHz maximum. Most IGBTs start having serious switching problems above 60 KHZ. I usually design for 40 to 50 KHZ max.
Another trick is to use a rather large dia. sec, like 6 to 12 inch dia. This also keeps res freq down, usually with around 2,000 turns or slightly less.
And don't overcouple the coils. Values above 0.18 are unneccessary and usually asking for racing spark trouble. 0.2 would be an absolute max for reliable operation.
Registered Member #2390
Joined: Sat Sept 26 2009, 02:04PM
Location: Milwaukee Wisconsin
Posts: 381
You should set the modulator to 250us pulse width and 100hz pulse repetition frequency to start with. I made the mistake of powering up with mine with the modulator set wrong and fried the igbts.
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secondary coil inefficient or not?
