Guru
Joined: 21/06/2018
Location: AustraliaPosts: 1172
| Posted: 09:35am 10 Jun 2024 |
That sure is a scary looking piece of equipment - I think I will stick to inverters.
Is that a type of magnetron ? It sure is a complicated looking pie warmer. Is that actually MHz on the tuning scale?
Now to the mains filter. I would not put it there personally I would connect it at the exit point where the Mains exits your cabinet, it will better filter inverter and MPPT noise on the external mains wires. It should not matter about its impedance where it is, as it is in a servo loop, so the inverter regulates to wherever the sense wires are connected after the filter, as you have it set up.
I prefer to have the voltage sense feedback wires connected direct to the toroid winding. As far as a bit of droop after the Filter at the final output, which the inverter wont know about, I say ignore it. Ok so the light might slightly flicker when things turn on or off not much different to the street mains supply in most cases.
As far as the voltage increase goes I suspect that if you measure at the sense wires for loaded and unloaded the readings should be the same. If not it might be due to an imperfection in the "precision rectifier", as it is an AC Peak not an AC RMS circuit, so if there is any distortion of the sine wave it will not be a perfect result so a minor change of a volt or so can be ignored.
Before you relegate the chokes to the waste bin you should find my earlier communication I dont remember the exact details but thought was it 11 turns would be good but you used 13 (I think those were the numbers) so reducing the ampere turns a little will help reduce the heat a bit. Anyway hope it is performing to your expectations now.
To help reduce radiated noise from the inverter I would find 2 x 4,7 - 10n capacitors of at least 250VAC rating and place them at the 2 nodes where the chokes connect to the toroid (27VAC?) and the other end of the Caps to chassis ground. Place the caps as close to the chokes as convenient, that should help tame some of the harmonics of the fast switching FETs. Maybe your radio might suffer less.
Edited 2024-06-10 19:40 by wiseguy