Re: LTSpice model for a SiC MOSFET

On Mon, 19 May 2025 16:13:40 +0100, liz@poppyrecords.invalid.invalid
(Liz Tuddenham) wrote:

Bill Sloman <bill.sloman@ieee.org> wrote:
>

I'm looking at a problem where somebody wants to step down a 1kV low
current source to 3.3V.
 
The Baxandall class-D oscillator could do it, but it needs a pair 1.7kV
MOSFETs for the job. The Infineon SiC IMH170R450M1 would do it - though
it's a much higher current part (10A) than the job needs (about 1mA).
 
I've dived into the Infineon rabbit-hole which promises LTSpice models,
but wasn't able to find one.
 
Does anybody know of a similar - ideally cheaper and smaller - part for
which there is an LTSpice model?

>
How about a piezoelectric transformer run in reverse?  Neon tubes
illuminating a solar cell?  Capacitive divider using a spare core in the
mains supply lead as one plate of the capacitor?  (Depending on supply
frequency and required output current.)

There was once a piezo-based isolator that could move some milliwatts.

I've used PV isolators to power floating mosfet gate drivers, but they
top out well under 100 uA so can't power a lot of stuff.

Capacitive dividers are inherently lossy. Transformers are a PITA but
are best for high-voltage-ratio power conversion.

I want to design something with one cheap drum core inductor on the
top of a PCB coupling to another one on the bottom. Just don't have a
use for it now.

I've seen scopes and such that have a "line" trigger, where the pickup
was an insulated wire wrapped around the highside insulated AC power
lead. Scopes don't always have line triggers much any more.

Some of our instruments have line trigger capability, but we ask the
user to plug a transformer-type wart into the back for that.

Going from 1KV to 3.3v has interesting possibilities. The easy way is
a resistor and a zener. Efficiency about 0.3%.

More efficient would be a resistor and a zener and then a buck
switcher. 5% maybe.