Guru
Joined: 13/10/2014
Location: AustraliaPosts: 2018
| Posted: 02:12am 12 Jan 2023 |
I wondered if a small cap at the output of the choke might help roll off signals > 20kHz, but once a value was high enough to make a change, it was for the worse, more noise on the waveform at the output from the choke - values from .002 to .1 tried.
Looking at the output from the Choke, I adjusted the inductance of the choke for the lowest noise, it only raised the idle current by 30ma and required an extra two turns, but really cleaned it up some.
I find that a second choke in the Lo bridge to toriod lead, while making the waveform slightly smoother, resulted in an occasional spike on output waveform (240V out) when the load was witched on or off, but not all the time, it does not happen with just one Choke, I even tried reducing the inductance of each choke in case I was seeing an inductive spike, but made no difference.
Just out of interest, when the single choke is moved to the Lo side, the AC output has that very noticeable familiar ripple, I thought it would be a lot worse, and still runs fine, but again only tested with a light load, I'm limited to a few hundred watts at the moment. Yes, I put choke back on the correct High side.
Before the choke.
After the Choke (primary of toriod).
AC output.
Apology for bury images.
Edited 2023-01-12 12:17 by KeepIS