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Re: Resonant cap?
Original poster: "JT Bowles" <jasotb@xxxxxxxxxxx>
For your 30KHz transformer, the formulas that you want are these:
Zout = Vs_oc_rms/Is_sc_rms
Cres (nf) = 10^9 / (2*pi*freq*Zout)
use 30KHz for your frequency. The assumption here is that the
winding resistance is insignificant compared to the current limiting
leakage reactance. If you can measure the primary and secondary
winding resistance, we can verify the assumption.
For the...thrid time now, online calculators only work for 50/60Hz.......
My Transformer runs at 30kHz, 2KV AC, 10ma.
Again, you cannot use an online calculator in this case. Go back to
deep fried neon. Look above where you put in the voltage and current.
It has a selection for"50 Hz" and "60Hz". NO 30KHZ.
So far, I have only received one real response; 26.5pF. I calculated
by hand and received a similar answer. I need some more opinions though.
From: "Tesla list" <tesla@xxxxxxxxxx>
Subject: Re: Resonant cap?
Date: Fri, 26 Jan 2007 21:36:10 -0700
Original poster: otmaskin5@xxxxxxx
JT, there is called Deep Fried Neon which I've found very helpful in
designing a coil and calculating what you want. I don't recall
seeing this site discussed on this list & the other TC design
softward is probably considerably more refined and accurate - I
don't know - but the I have used the Deep Fried site & it seems to
work for me. It is S-I-M-P-L-E & easy to use, which is why I have
used it. I'm still a relative newbie.
There is an icon to click on to calculate required capacitance for a
given transformer. Just plug in the 2 key variables 2KVA & 10mA - &
it will tell you what resonant capacitance you need. You'll want to
take this value & increase it by 50% to help protect your
transformer & for other reasons.
Anyway, check you the site. There are significantly more
knowledgeable people on this list, so I'd be interested in their
assessment of design software on the Deep Fried Neon site. Safe
coiling, Dennis Hopkinton MA.
Sent: Fri, 26 Jan 2007 12:56 AM
Subject: Resonant cap?
Original poster: "JT Bowles" <<mailto:jasotb%40hotmail.com>jasotb@xxxxxxxxxxx>
Its me again. I have looked all over the net for the appropriate
equation, but I have not found it.
Can someone tell me what the resonant capacitor would be for a
2KVAC, 10ma transformer, running at 30khz?
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