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Registered Member #1107
Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
I was wondering what the formula is for calculating that tank cap size for drsstc use? The secondary specs are 18" tall wound on 4.5" former with 30g wire.
Registered Member #989
Joined: Sat Sept 08 2007, 02:15AM
Location: São Paulo, Brazil
Posts: 476
I think its like a common SGTC, that L1 * C1 = L2 * C2 but the resistive loses are more complicated in DRSSTC because it works with relative low voltages and very high peak currents (some get impressive 400A of peak on the primary)
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Yes, the above is correct, but since L1 and C1 are two unknowns, you need one more equation, and here it is
Assuming you already know the resonant frequency of your secondary with toroid, and you've chosen your IGBTs, use the formula for impedance of a capacitor (Xc = 1/(2*pi*f*C)) to find C. Set Xc equal to 10 times your DC bus voltage divided by your IGBTs' rated current, set f equal to the resonant frequency of your resonator, then solve for C.
The voltage rating of the tank cap is 10 times the DC bus voltage, and if you set your OCD to the value you assumed above, you know it won't be overvolted. If you want to run the IGBTs above their rated current, decide what current you want and use that in the formula.
For a half bridge divide the DC bus voltage by 2. Heck, there may even be a factor of 4/pi in there but I just ignore it, the cap value isn't that critical, since you'll do final tuning with the primary tap point. Just mess with it until you get the amount of primary current that you assumed to start with.
Registered Member #1107
Joined: Thu Nov 08 2007, 10:09PM
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Posts: 792
Ok. You kind of lost me on that . I have never really done these equations before so i am very new to this. Can you explain this in a little better detail? *starts scrounging for his notebook*
JAVATC will allow you to explore a wide range of options with both pri cap and pri inductor.
After running you intial "test case" with perhaps a 10 turn primary and 0.15 uF cap value, then check your coeff. of coupling. Adjust sec coil height and also pri-sec distance to get a k value of around 0.16 for most solid state coils.
Then, play around with your cap size and see the number of primary turns required to resonance it.
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calculating cap size for a drsstc?
. I have never really done these equations before so i am very new to this. Can you explain this in a little better detail? *starts scrounging for his notebook*
