Sounds like a ferroresonant power conditioner. Does that ring a
bell? I don't think they are very efficient, but they are quite
effective at producing sine waves from all kinds of nasty inputs.
Donald.
On 2023-07-05 04:00, Kerim via
groups.io wrote:
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I guess many of
you, if not all, heard of pure sinewave inverters which use
conventional two-winding iron core transformers.
Their transformer
is driven by a MOSFET bridge which, in turn, is driven by a
sinewave PWM (for 60/50 Hz) whose frequency could be 16 KHz, for
example.
This means that
the transformer, with or without load, can also act as an
effective low pass filter (perhaps with a very small ripple on
its output voltage).
?
My first thought
is that the transformer¡¯s leakage inductances play the main
element(s) in its function as LPF. But there must be another
element to complete the LPF. Is it the stray capacitances, the
core losses or both?
?
In vain, I have
searched a linear model which could be used in simulating a
transformer in such application.
I wonder if
someone recalls that such a model could exist in the group¡¯s
archive so that I will redo my search looking for it.
?
Thank you.
Kerim
