Any idea of the rise time and duration of the 15KV
spike?
Spark gaps or quench tubes can be useful , but they
are slow, and can raise much havoc if not carefully
applied.
A TVS can help after the divider.
As far as pcb isolation gaps, you may want to check
the CE standards. My gut feel suggest a 3/8" gap
should be ok, but be sure to check the standards, as
my memory... well you know.
Optical isolation is pretty much the norm. If the 15kV
is long duration, you may want to use optical fiber,
as standard opto isolators are only good to a few
thousand volts.
Ron
--- Dave Mucha <
dave_mucha@...> wrote:
> Hi all,
>
> I'm looking to measure a 300 volt line and drop it
> to 5 volts. One
> of the many problems is that there is also the
> potential of a 15kV
> spike on the line.
>
> I would appreciate any help finding parts that can
> withstand the high
> voltage. And any links to information on what to
> watch out for.
>
>
> But, for this group. Does anyone have any ideas on
> how to determine
> the slices in a PCB around chips ? I would like to
> isolate the 15kV
> pulse from the rest of the board. A second board
> is a very good
> possibility.
>
> VERY open to suggestions.
>
> Dave
>
>
>
>
>
>
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