Re: [TCML] quench times again

[FutureT@xxxxxxx]

In a message dated 11/24/2007 11:45:11 A.M. US Eastern Standard Time,  
list@xxxxxxxxxxxxxxxxxxxxxxxxx writes:

... I  was looking from the reverse that as 
frequency goes up mutual inductance  goes down and you get a faster rate...

It sounds to me like MPH is the  mutual inductance term, not exactly the 
frequency ? Though both factors  alter in respect to eachother  anyway.....


Chris



Chris,
 
There's two ways to get a faster rate of transfer.  You can use a  higher
frequency (in a way) or a tighter coupling.  Using a tighter  coupling will 
reduce
gap losses during the transfer, but the gap will be harder to quench,
so it probably won't quench on first notch unless a ground strike  occurs.
If coupling is too tight, you'll get racing sparks and pri to sec  arc-overs.
 
Using a higher frequency will mean the gap is firing for a shorter  time.
The rate of energy transfer will be faster (from a clock point of  view,
not from an RF cycle point of view), so the losses will also be
speeded up.  In the end the gap losses will be the same.  The  key
is how you measure *rate of transfer*.  If you measure it with  the
clock (in microseconds), then yes a high frequency will give a faster
energy transfer.  But if you measure by the RF cycle, then for
a given coupling value, the same number of RF cycles will be
needed to reach the notch whether the frequency is low or high.
 
Think of it this way:  Suppose you are shoveling coal.  You  shovel
at the rate of 1 shovelfull per second.  But each time you  handle
the shovel, some coal (10%) falls off the shovel and never makes
it into the dumptruck you are trying to fill.  This 10% of the  coal
represents the losses.  Now lets say you start shoveling twice
as fast.  You shovel at the rate of two shovelfulls per second.
Now 10% of each shovelfull will still fall off the shovel each time
you handle the shovel.  In the end of the job, the dumptruck
will be full of coal, but there wlll be another 10% as much forming
a pile of coal on the ground that fell off the shovel.  This pile  will
be the same size whether you shovel fast or slow.  The coal
losses are the same for fast or slow (high or low frequency)
shoveling (or coiling).
 
Regarding your other email, I don't know of anyone who used
a 1000uF cap at 2mHz at very low voltage with an SCR system.  
 
John



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