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@REPLYADDR John Larkin <jl@997arbor.com>
@REPLYTO 2:5075/128 John Larkin
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On Sun, 24 Sep 2023 09:18:31 -0700, John Larkin <
jl@997arbor.com>
wrote:
>
>This is pleasingly weird.
>
>
https://www.dropbox.com/sh/sif3efs69dxe1mg/AACY0RJGXl4k8CVvauUbJtYFa?dl=0
>
>Sort of a baseline-boosted multi-auto-transformer voltage-doubler
>flyback.
>
>What`s strange is that adding the two snubbers increases the LT spice
>sim speed radically, about 10:1.
OK, this has become sort of a background hobby, waiting on the
customer to get serious.
https://www.dropbox.com/scl/fi/60nb1pcrnl17c07tk8xeu/T875_HV_9.jpg?rlkey=9uv466e
dcuvddmjldgepcyi0u&raw=1
All the caps are a part that we have, 100nF 630 volts 1812. Of course
the capacitance plummets as voltage goes up, so the Spice values have
to be adjusted appropriately. C is only 20nF at 500 volts.
The RCD snubber is nice. It softens the rise at the fet drain and
dissipates less power than a simple RC that damps ringing about the
same.
10 ms of sim runs in about 30 seconds on a wimpy laptop, which is
tolerable.
I just got four new monster Win11 machines which should be blinding
fast with Spice. We`re setting up one to look and behave sensibly (ie,
like Win7 did) and will clone the other three when I`m happy with
that.
We did manage to get the PADS pcb programs to install. That`s always
an adventure.
Windows keeps getting worse. It has become an ad+annoy vehicle for
Microsoft. At boot time, the home screen is a full-screen ad for Edge
that won`t go away. Explorer drag-and-drop is insane. Screen capture
is insane.
I can`t make Irfanview the default image viewer. Another annoyance.
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