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Re: De-Q-ing diodes



Original poster: "S & J Young" <youngs-at-konnections-dot-net> 

Rob,

I use 40 1N5408s in series for de-Qing with my resonant charging setup (72
inch streamers) and they seem to do just fine.  My max DC voltage is 12 KV.
I put mine on the power supply side of the reactor, hoping the reactor
filters out most of the high frequency pulses from the coil.  The 1N5408 is
in essence a 3 amp version of the 1N4007, with slow recovery time.  You
might consider using the more beefy 1N5408s - if you look around, you can
find them for a cost of not much more than the 1N4007s.
--Steve Y.

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, November 30, 2003 9:29 AM
Subject: De-Q-ing diodes


 > Original poster: Rob Maas <robm-at-nikhef.nl>
 >
 > Hi All,
 >
 > Recently Daniel Barrett wrote:
 >
 >
 >  >Original poster: "Daniel Barrett" <dbarrett1-at-austin.rr-dot-com>
 >  >
 >  > Gee, I feel like an advertisement for these things, but the 1N4007,
though
 >  >cheap, is a little slow for the 200uS-ish pulse from the coil. I
 >  >experimented with this a year ago and they are inefficient, get hot and
die
 >  >fast when used with anything but a 60Hz sine wave due to a very slow
reverse
 >  >recovery time. Better to use then UF4007 (A string of 50 for your
 >  >application). More expensive but will work as expected for higher
frequency
 >  >stuff like ignition coil rectifiers and DC Tesla coil "De-Q-ing" diodes.
Get
 >  >these from Mouser or similar. Digikey does not carry them.
 >  >db
 >
 >
 > I was just planning to construct a de-Q-ing diode from a string of
1N4007's.
 > Now I am worried. I thought a de-Q-ing diode basically 'sees' only as
highest
 > frequency BPS_max, say 400-600 Hz ?
 > Has anybody experience (good or bad) with using 1N4007's in such
applications.
 > The UF4007 certainly is 'better' than the common 1N4007, but also MUCH
more
 > expensive (I need at least 40...).
 >
 > Any reaction greatly appreciated,    Rob Maas
 >
 >
 >