Re: Charging inductors for resonant charging

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

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
>
>.