[Open_electroporator] Culture Shock yardboard testing
Nathan McCorkle
nmz787 at gmail.com
Mon Jun 27 15:28:01 UTC 2016
On Jun 27, 2016 7:46 AM, "John Griessen" <john at industromatic.com> wrote:
>
> On 06/27/2016 02:42 AM, Nathan McCorkle wrote:
>>
>> Am I reading it correctly that the pulse, though 5msec short in
>> duration, is providing 100 amps? Does that mean we need a power coil?
>> Or because we know we aren't using it with a constant duty-cycle
>> (should actually be relatively very low compared to normal power
>> applications), can we use a lesser transformer (I guess it will heat
>> up faster relative to a heftier coil)?
>
>
> We are designing for 30k Ohms and have been from the start, as in
"non-salty solutions".
Yes I can follow the timeline of development, but my reason for posting
such specifications was exactly because it is different by 10x. It could
easily be major design flaw, of course only testing will tell unless we
find historical information. You also addressed none of what I actually
asked.
> Yes the all purpose one you used was able to do that huge power transfer,
and it had
> a huge box
No actually, it was quite small, equivalent if not less than a toaster in
volume (compared to other electroporation units it was small). Also I
don't care if the box is huge, more that it works and is effective and
obtainable for others.
> We need one that does relatively more than the 2 amps during the pulse
that this tested one does,
So you're thinking 50x less impulse than the "100 amps" the commercial unit
quoted is OK? What reasoning/logic? Or can you respond to my previous
question/comments on this amperage quote?
> > topology. I checked a few days ago and it seems car ignition coils are
> > 100 turns ratio.
>
> Turns ratio is just the same as open circuit voltage ratio, so car
ignition coils
> of the ordinary kind cause sparks that jump 1/4 inch, or 10 kV, so the
ratio is more like 833.
This seems childish, but I read what I read on a product listing, google
also confirms with first hit:
https://www.google.com/search?q=car+ignition+coil+turns+ratio
>
> I just googled 'diy high current pulse' and got this
> > link which uses car ignition coils... way bigger than what we want and
> > way higher duty-cycle for sure:
> >
http://www.rmcybernetics.com/projects/DIY_Devices/homemade_power_pulse_generator.htm
> >
> > Maybe it can help, or not...
>
>
> I'm working on engineering which is the balance of cost and performance.
have not given up in favor of
> overkill by 100X yet.
Please please please don't misinterpret research and learning links with me
nudging you to go develop something overkill. I expected you'd read the
paper by skimming quickly, then report on how their topology is
similar/different and how it did/didn't inspire you for this project.
> Way bigger than we want is definitely a minus for using in a product.
*sigh* I feel like I am being misinterpreted and my comments and discussion
being ignored/devalued.
>
> On 06/27/2016 03:33 AM, Nathan McCorkle wrote:
> > Another possibly helpful link for schematics or theory discussion:
> >
https://www.pes.ee.ethz.ch/uploads/tx_ethpublications/__TPS_Optimal_Design_of_a_3.5kV11kW_DC-DC_Converter_for_Charging_Capacitor_Banks_of_Power_Modulators_02.pdf
>
> Thanks Nathan. Our optimization problem is to get small and light and
use what we know we need,
I know, what do you think of the paper though after skimming for 45
seconds?
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