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[TCML] RE: Tesla Digest: BPS upper limit?



Pardon my ignorance, but isn't there a point where the break rate is so high that the capacitors can't discharge fully before quenching occurs? It seems from your discussions that maximum energy can be delivered to the secondary when the break rate is highest, but shouldn't there be an upper limit coinciding with the peak of the charging waveform in the secondary? I mean, the maximum energy we can deliver to the sec. circuit will equal our input - and this will happen when our bps is highest possible? In other words, efficiency is directly proportional to bps?
Etienne Dreyer
 

--Forwarded Message Attachment--
From: bturner@xxxxxxxx
To: tesla@xxxxxxxxxx
Date: Tue, 7 Feb 2012 11:50:42 -0800
Subject: Re: Sync vs. async - was Re: [TCML] 3 phase sync.

Higher break rates don't equate into longer discharge lengths. Given that
the primary circuit isn't swamping out the transformer (saturating) a
higher BPS results in simply more bangs per second from the secondary, ie;
transfer of greater energy OVER TIME.
 
In my 'medium-size' coil system, I have 0.6uF and originally ran at
120BPS. Got 6 foot discharges that nicely wandered around. I upped the BPS
to 240 and the discharges did not increase in length, but became FAR more
energetic.
 
Most recently, a gap re-design produced 600BPS(!). Of course the power
draw (or suck??) went up, but the discharges, though still only about 6
feet in length, are FAT, NOISY and HOT. White-hot! And my transformer is
only 1:100 ratio, meaning 12Kv output voltage.
 
If we step back and think about it for a moment, that's why Tesla had such
a high BPS in the Magnifying Transmitter - High Cp and low Hp equals FAST
field build and collapse which couples a lot more energy, which makes
sense as the 'secondary' was merely a high-current signal source for the
extra coil.
 
It's also important to note that the gap dwell time plays a BIG role in
energy transfer as well. Long dwell in low Z systems is detrimental due to
a portion of the magnetic field being lost BACK through the gap. Ideally,
dwell is such that the gap duration *JUST* cuts off when the resonant rise
in the secondary peaks. Since my system has only 4 turns in the primary,
and approximately 240 turns in the secondary, it is a relatively high Q,
low Z system. So a short gap time and high BPS then allow a helluva lot of
energy to be coupled to the secondary.
 
Crude math approximation revealed approximately 18 joules(!) of peak
discharge energy occurring at 600 times per second. Given the uS rate of
secondary discharge duration, that worked out to something like 18MW(!) of
peak secondary impulse energy. (And I sit on top of THAT...)
 
No wonder Tesla was able to coax 100+ foot discharges off the top of the
'Transmitter'. (Also no wonder why if I'm not careful, a power-arc will
literally throw me off the table.)
 
- brent  		 	   		  _______________________________________________
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