Re: Charging inductors for resonant charging

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

Original poster: jimmy hynes <chunkyboy86-at-yahoo-dot-com> 

You sure? I still think it should work.

The current will be unidirectional, but the voltage wont, so the current 
wont build up like it
would with a DC voltage. Most of the flux generated by the secondary will 
just be cancelled out by
the secondary. The only flux is due to magnetizing current. Since the 
voltage across the primary
is a sine wave, to find the magnetizing current, it is just V/2*pi*F*L. The 
frequency is probably
going to be higher than the normal 60hz, so unless you are overvolting it, 
it should be farther
from saturation. Do you still disagree?
--- Tesla list <tesla-at-pupman-dot-com> wrote:
 > Original poster: Bert Hickman <bert.hickman-at-aquila-dot-net>
 >
 > Jimmy,
 >
 > That's why I originally thought it should work. However, because of the
 > de-Q'ing diode in the current path, the charging inductor's current will
 > only be unidirectional, which will drive the ungapped core into saturation.
 >
 > -- Bert --
 >
 > Tesla list wrote:
 >
 > >Original poster: jimmy hynes <chunkyboy86-at-yahoo-dot-com>
 > >In a DC resonant charging system, the voltage across the inductor is AC.
 > >The voltage across the
 > >inductor changes polarity when the voltage across the capacitor goes from
 > >< VDC to > VDC. The
 > >transformer should work without a gap, all the energy is stored in the low
 > >voltage inductor.
 > >--- Tesla list <tesla-at-pupman-dot-com> wrote:
 > >  > Original poster: Bert Hickman <bert.hickman-at-aquila-dot-net>
 > >  >
 > >  > Hmmm... you're right! I suppose that's why it sounded too easy!  :^)
 > >  >
 > >  > For a DC resonant charging system there appears to be no avoiding 
the need
 > >  > for an air gap in the inductor's magnetic circuit. However, if the 
core of
 > >  > a moderately sized DT could be cut to introduce an air gap, then this
 > >  > approach might still have some merit. The approach would provide 
high BIL
 > >  > and current handling and a means to external adjust the charging
 > > inductance
 > >  > without resorting to a custom wound inductor. Now, the challenge 
becomes
 > >  > how to cleanly cut the core of one of these beasts.
 > >  >
 > >  > -- Bert --
 > >  >
 > >  > Tesla list wrote:
 > >  >
 > >  > >Original poster: "gtyler" <gtyler-at-drummond-dot-org.za>
 > >  > >Are you not using this choke on DC? If so the transformer will 
saturate.
 > >  > >----- Original Message -----
 > >  > >From: "Tesla list" <tesla-at-pupman-dot-com>
 > >  > >To: <tesla-at-pupman-dot-com>
 > >  > >Sent: Sunday, February 01, 2004 2:57 AM
 > >  > >Subject: Re: Charging inductors for resonant charging
 > >  > >
 > >  > >  > Original poster: "Jim Lux" <jimlux-at-earthlink-dot-net>
 > >  > >  >
 > >  > >  > Very, very clever... I like it!
 > >  > >  > One could make a very sophsticated system if one wanted, and 
you'd be
 > >  > >  > working at "reasonable" voltages
 > >  > >  > ----- Original Message -----
 > >  > >  > From: "Tesla list" <tesla-at-pupman-dot-com>
 > >  > >  > To: <tesla-at-pupman-dot-com>
 > >  > >  > Sent: Saturday, January 31, 2004 10:25 AM
 > >  > >  > Subject: Re: Charging inductors for resonant charging
 > >  > >  >
 > >  > >  >
 > >  > >  >  > Original poster: Bert Hickman <bert.hickman-at-aquila-dot-net>
 > >  > >  >  >
 > >  > >  >  > Ed, Jim and all,
 > >  > >  >  >
 > >  > >  >  > Here's an idea I was kicking around with Ed Wingate a while 
back.
 > >  > >You
 > >  > >  > could
 > >  > >  >  > simply use another distribution transformer and ballast as a HV
 > >  > >charging
 > >  > >  >  > inductor. Use the HV winding in series as the charging 
inductor.
 > >  > >Connect
 > >  > >  >  > the low voltage side of the DT to high current ballast 
(welder or
 > >  > >  >  > adjustable high current inductive ballast). The DT will 
multiply
 > >  > >the LV
 > >  > >  >  > side ballast inductance by its turns ratio squared, easily 
making
 > >  > >the HV
 > >  > >  >  > side look like a large, adjustable, HV inductor. And a properly
 > >  > >sized DT
 > >  > >  >  > already has the necessary BIL and current rating required.
 > >  > >  >  >
 > >  > >  >  > By selecting the proper distribution transformer and 
ballast, you
 > >  > >should
 > >  > >  > be
 > >  > >  >  > able to get almost infinite flexibility with without the 
need to
 > >  > >resort to
 > >  > >  >  > a custom HV choke.
 > >  > >  >  >
 > >  > >  >  > Best regards,
 > >  > >  >  >
 > >  > >  >  > -- Bert --
 > >  > >  >  > --
 > >  > >
 > >  >
 > >  >
 > >
 > >=====
 > >Jimmy
 > >
 > >.
 >
 >
 >
 >
 >


=====
Jimmy

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