Re: Charging inductors for resonant charging

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

Original poster: "Jim Lux" <jimlux-at-earthlink-dot-net> 


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, January 29, 2004 8:30 PM
Subject: Re: Charging inductors for resonant charging


 > Original poster: "S & J Young" <youngs-at-konnections-dot-net>
 >
 > Jim,
 > I have used the secondaries of MOTs successfully.  MOTs range from 6 to
20+
 > Henry, so you may have to measure a few of them to get the value you want.
 > If you want to control saturation, it only takes a few minutes to hacksaw
 > through the core welds and put a small air gap in the magnetic path (e.g.
a
 > few layers of masking tape).  I didn't bother to remove the magnetic
shunts.
 >
 > I don't know what your end use is, but if it is a TC, consider using a RSG
 > configured as a SPDT switch.  This is used to charge the tank cap, then
 > discharge it through the primary.  Your power supply is totally
disconnected
 > from the tank circuit as it discharges.  In this configuration, the
charging
 > reactor only needs to be around 0.2 Henry and can easily be made with a
few
 > air coil solenoids in series to withstand the voltage.


The application is a triggered spark gap TC (actually, more than one, fed
from a large, stiff (and mindbendingly lethal) DC supply).  Interesting
idea, though of SPDT configuration. Two triggered gaps, one to charge the
tank, one to discharge it.  Hmmm.. elegant, albeit probably a bit lossy, but
heck, what's a few kW.

 > --Steve Y.
 > .
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Thursday, January 29, 2004 5:52 PM
 > Subject: Re: Charging inductors for resonant charging
 >
 >
 >  > Original poster: Jim Lux <jimlux-at-earthlink-dot-net>
 >  >
 >  > At 08:01 AM 1/29/2004 -0700, you wrote:
 >  > >Original poster: Ed Phillips <evp-at-pacbell-dot-net>
 >  > >Tesla list wrote:
 >  > > >
 >  > > > Original poster: Jim Lux <jimlux-at-earthlink-dot-net>
 >  > > >
 >  > > > What sort of sources are there for a 5-15 Henry charging inductor
for
 > a
 >  > > > resonant charging circuit? RMS current would be in the 1-2 Amp
range.
 >  > > >
 >  > > > Is this a "wind it on a MOT core" kind of thing?
 >  > >
 >  > >         I'm no a magnetics designer but that sounds like a HUGE
device
 > to me!
 >  > >If the charging frequency was 120 Hz the reactance of the 5 henry
choke
 >  > >would be about 3770 ohms and the voltage across it at 1 amp would then
 >  > >be 3770 volts.  If it is to pass 1 amp the wire size would probably
have
 >  > >to be around #22 even for intermittent operation, and the resulting
wire
 >  > >area would require a large core.  Real designers step forward?
 >  >
 >  >
 >  > So then, what ARE people using for charging chokes in resonant charging
 >  > systems..
 >  >
 >  >
 >  >
 >  >
 >  >
 >
 >