[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

OLTC - Re: Primary resonators with very low L/C ratio



Original poster: "Terry Fritz" <teslalist-at-qwest-dot-net>

Hi,

>Higher Fo frequencies really help this!  I was trying to get away with 
>120BPS (AC resonant line charging) so to get power I needed larger primary 
>caps.  Which lead to lower Fo, which lead to very large Lsec, which lead 
>to High series losses in the secondary...  For higher power coils, 
>resonate charging (even at 360 BPS three phase) may not be an option.  To 
>get very high BPS rates we seem to need a type of DC charger like Steve 
>used.  My OLTC was a little too big for resonant charging and it's 120BPS 
>limit.  But resonant AC charging does vasty reduce weight and 
>complexity.  Probably great for a smaller or even "table top" OLTC...

I should mention that we could also borrow the idea of the "leak tester" 
recently discussed.  In a very real way, it is an OLTC too!!  AC line 
current charges a very small cap and fires with a very high BPS rate (on 
the AC cycle peaks):

http://hot-streamer-dot-com/temp/030707-01.gif

Note the 60uS burst spacing:

http://hot-streamer-dot-com/temp/030707-02.gif

1 / 60uS = 16666 BPS!!  So instead of using super high primary currents, 
they use super high BPS!!  One could replace the vibrating contacts with 
solid state IGBTs or FETs to get lower loss and any BPS rate one could wish 
for.  A reasonably simple AC line rectifier charging a BIG filter cap could 
be used to provide DC charging to a small cap.

I am not sure what cap size the leak testers use, but we can think it 
through...

20000 BPS, 160Volts firing (rectified AC), 1000 watts....

Joules per bang is 1000W / 20000BPS = 0.050J

0.050 = 1/2 x C x 160^2   C == 3.9uF

With a 650nF primary you would get 100kHz for Fo.

A 100kHz disruptive Tesla coil operating at 1000W and 20,000BPS would be 
"different"....

Something to think about....

Cheers,

         Terry