Re: [TCML] Voltage - Gap

[jhowson4@xxxxxxxxxxx]

I actually have no idea how to do the calculations you speak of, not even a ball park idea. Is there a specific parameter on the data sheet that tells you how much energy these can dissipate in the form of heat? And if so could you give a few hints as to how I would go about these calculations. 



Thanks, 
John "Jay" Howson IV 


"Why thank you, I will be happy to take those electrons off your hands." 

----- Original Message -----
From: "Jim Lux" <jimlux@xxxxxxxxxxxxx> 
To: tesla@xxxxxxxxxx 
Sent: Monday, January 30, 2012 10:29:07 AM 
Subject: Re: [TCML] Voltage - Gap 

On 1/29/12 7:02 PM, jhowson4@xxxxxxxxxxx wrote: 
> Interesting, 
> Thank you John and Gary for your responses in particular. 
> 
> 
> So, It would require direct measurement to determine which notch the gap is quenching on. Something I can do after I am done the coil. But I could also directly measure the dwell time from that as well. 
> But it does not really help me right now. This is still all part of my trying to write a program to aid in MMC design. Of which the RMS current is an important factor. So I will have to rely on an estimation. I think its save to assume that we are not really going to ever go beyond 3 energy transfer periods. So one could make a good estimation on the dwell time solely based on the time for one period of total energy transfer X3. This would be the maximium theoretical it could be. Unless I am wrong on that. 
> 
> At some point in the near future I will do the math and see if the time between the initial conduction set by the breakdown voltage of whatever it is in air and the the electrode moving away from the stationary electrode and the total energy transfer time x3 are at all comparable, if so then it might make a good estimation. if not then I will need to find something else. 
> 

before you work too hard modeling fine details, do a simple subset and 
see if it makes a significant difference. You might find that in an RMS 
current, heating sense that it doesn't make much difference between one 
big pulse at Imax and 3 successive pulses at Imax/3, because the duty 
factor is lower at the former. (Yes, heating goes as the square of 
current, so that's clearly not true in this specific example, but it's 
what I was able to come up with before my coffee as a direction to look) 

The thing is that you only have a certain amount of energy in the system 
at the beginning of a "bang", so that sets an upper bound on the energy 
that could be dissipated in your capacitors (worst case - ALL of it is 
in the caps). You may find that the lamest capacitors available can 
take the full load, so there's not much point in optimizing further. 
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