Re: An Economical Magnecharger (inductive charger)

[Rich Rudman <rmanzan@tscnet.com>]

Lee Hart wrote:
> 
> Justin Southam wrote:
> >             what is the impact of not interleaving?
> 
> Think of a transformer somewhat like a torque converter. If the primary
> and secondary are tightly coupled, then efficiency is highest and we
> have a precise ratio between input and output voltages. Like a torque
> converter or clutch that is locked up; nearly 100% efficiency, exactly
> the same speed in and out.
> 
> As you separate the windings, the coupling gets looser; it can "slip"
> like a torque converter, which lowers efficiency. But it can also change
> the voltage and current ratios (like a torque converter can multiply
> torque and reduce speed).
> 
> > If we mount the primary bobbin and the I stack in a frame with a
> > handle, can't we slide the bobbin over the E then the I stack meets
> > the E stack as normal with maybe a quarter turn of the handle to lock
> > and clamp (some sort of taper arrangement) them together.
> 
> I think you mean like this (view with fixed width font):
>  ___________________
> |                   |
> |___________________| paddle assembly
>      PPP     PPP
>      PPP     PPP
> 
>  ___     ___     ___
> |   |   |   |   |   |
> |   |   |   |   |   |
> |   |SSS|   |SSS|   | secondary assembly
> |   |SSS|   |SSS|   |
> |    ---     ---    |
> |___________________|
> 


Lee et All.
	First I would find the Stock supplier of the Lam Es and Is. Like start
with a VERY common size and shape. Get a stack of them and then play
with adding and subtracting them to get a BIG enough Transformer.

	Also of note. The PFC20s use a inductor, and 40Khz of switching. This
makes for a LOT smaller inductor transformer. Also you can get Powdered
Iron Es. Get two and have your primary on one side and your Secondary on
the other. This lets you make the hardware a LOT smaller and may allow
your to get decent coupling and power conversion Eff.
	 Also I call Lams "Stacked Razzor blades". I am not sure that I would
want to handel them offten.
	In the PFC20s we are stuffing 5+ kw thru a 4 inch Torroidal core. It's
even smaller than the Avcon receptical. With HF we could get this thing
pretty darn small.

	If a PFC20 control and power stage would help. Let me know. The concept
is the Power stage has some pretty fast Vsat current limits, and feed
backs for current limits and wave form generations. We could look at the
PFC20 front end as the "Primary side driver". The Freq can be dialed up
over 100K and well under 1Khz.
	This of course is not a dumd cheap 60 Hz solution. Still the safties
and mode shifting abilities may be needed to pull off this concept even
at 60 Hz.

Oh yea snowing In Seattle. And I just shipped my 5.6 Kw space heater to
Portland. It is the first PFC20 in Green metal. I bet Ralph Merwin has
the cover off in Oh 5 Min for the time he trips over on his door step. I
better get another one dialed up so I don't freeze in here tonight.

And the limit??? well the 7200 watter Beta ate it's 35 amp rectifier
bridge.. OOPss! 
Yea Turn it DOWN Madman!