Re: Charging inductors for resonant charging

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "gtyler" <gtyler-at-drummond-dot-org.za> 

Look at it this way: A choke can handle a DC current, but a transformer
will saturate with a very small dc current (the better the transformer
the lower the current required to saturate it). A transformer will not
pass a dc current from one winding to the other.
     So: The choke will see an AC current, and the transformer a DC
current and will saturate. Try it!

George
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, February 05, 2004 5:16 PM
Subject: RE: Charging inductors for resonant charging


 > Original poster: "Steve Conner" <steve.conner-at-optosci-dot-com>
 >
 >  >Hysteresis?
 >
 >  >The problem is that when the current is 0, there
 >  >is still flux left in
 >  >the core. Right? How would an airgap prevent this from happening?
 >
 > In the light of what we have discussed, the "flux left in the core"
thing is
 > probably not happening, and I feel a bit dumb for bringing it up now
X-6
 >
 > As far as I understand, the only way to have "flux left in the core"
would
 > be if the core had lots of hysteresis. Transformer iron is specially
made to
 > have as little hysteresis as possible, so it shouldn't be possible to
have a
 > significant amoutn of flux remaining at zero current. I think it is
more
 > proabaly as Malcolm Watts said, ungapped iron cores aren't designed to
store
 > energy.
 >
 >  >I was
 >  >talking about using a
 >  >transformer to step the voltage down so you could use a low voltage
 >  >inductor. I was saying that
 >  >the transformer shouldn't need an airgap.
 >
 > Maybe :-0 After all, people who run their coils off
pigs/PTs/bombarders with
 > primary side ballast chokes are sort of doing this already, but
backwards,
 > and with AC, not pulsed DC.
 >
 > I think it would work as long as you used discontinuous current and
never
 > exceeded the volt-second capacity of the transformer core. I.e. you
never
 > fed it more than the equivalent of a half-cycle of its rated frequency
at
 > its rated voltage.
 >
 > <scratches head>
 >
 > Steve C.
 >
 >
 >