[Open_electroporator] Why a flyback pulser ?

[Nathan McCorkle]

The HV switch the MOSFET pulser paper used was parallel MOSFETs right?
On Nov 11, 2013 10:13 AM, "John Griessen" <john at industromatic.com> wrote:

> http://www.dos4ever.com/flyback/flyback.html
>
> is a good write up of flyback transformer use.  this part from a good ways
> down is key:
>
> "Finally you can check for yourself the equation derived for the output
> voltage of the boost converter also holds for the flyback converter. This
> is not really surprising, like in the boost converter the flyback converter
> is based on the dumping of the energy from an inductor or the primary
> winding of a transformer in the load. The transformer just serves to lower
> the voltage over the switch. "
>
> The reason for dealing with the complexity of the flyback transformer
> instead of using
> a HV switch is HV switches are expensive or unreliable+dangerous, take
> your pick.
> A copper knife switch will do, if you like frankenstein like
> laboratories...but it will wear from the arcs on it.
>
> They make HV switches that are in a vacuum and weigh a pound and are just
> a relay.
>
> Very low performance -- slow.  Would not be possible to stretch out a
> pulse by repeated
> input switchings and the ratchet pumping effect of the HV diode.
>
> The HV diode is cheap, since they are used in microwave ovens everywhere.
>  HV switches are
> $75 used on ebay and $2K new.  Go figure.
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