Nano Power Inverter - Roll Your Own Style

Author	Message
Revlac Guru Joined: 31/12/2016 Location: Australia Posts: 1027	Posted: 12:10pm 09 Jul 2022       I can see how much fun you had, that's kind of fun you try not to have again ....I think thats how it works. The amount of capacitance required to get it to 75Hz is definitely unique to each built, can't even guess what it would be....I tried that.......failed.   Quote   The remanence in the transformer can apparently change the resonant frequency by nearly 100%.To confirm my findings I ran the nano code with a slow stop. Then I checked my resonant frequency and it was 76 Hz. Next I turned on a variable source with 1V @ 0.5A and placed it across the mains winding momentarily. Bingo! the resonance peak dropped and after a re-tune the peak was now at 132Hz. I then ran the nano code & soft stop and we're back to 76Hz AT LAST I finally nailed it !!  Even 50mA momentarily injected could cause a 20Hz shift in the peak I didn't run into the problem of the resonance change, I did the testing a little different. The signal generator was set to 75Hz to begin with, connected to the secondary winding and running, then add capacitance until the the peak could be seen on the OSC, or go a little past it with another cap to be sure, then removed the capacitors make a note of what size I need. Start and stop with caps removed, I don't think I had the choke connected any time at all. Anyway glad you found what it needs.