Jerry Walker - 2020-03-09
In this video I give a simple explanation of how a ferroresonant transformer works.
Dear Mr. Walker,
Thank You very much, really appreciate You and your contributions. I simply could not resist myself to say thanks. I do believe that your time invested in knowledge sharing and educating young engineers will be well rewarded one day, wishing you all the best and looking forward for more content like this.
With love, dignity and respect,
T.
Well if you don't mind going into more detail, I would love to hear how the resonance circuit works and what it does. I think I have an idea what it does but I want to hear it from the master. BTW great explanation so far, hope to hear more.
I honestly had never heard of this type of transformer before your videos - great insights..
Facinating! I knew these things existed, but had no idea how they work. I suppose I thought they just had some magic iron inside, which I suppose is sort of true. :-) After watching your video, I took a look to see if there's more to be learned in "The Art of Electronics" and was disappointed to see the topic wasn't covered there, either in the the 3rd editor or "The x-chapters". I'm looking forward to your next video to gain more insight in how these beasts work.
Wow! Thank you very much for that simplified explanation because I’m a D student in electronics engineering class because of my lack of math ability. Sense I build class a amplifiers as a hobby with a large in rush current in capacitor banks. Sounds like I would definitely have to build in a current limiting circuit over a period time to get this transformer properly started. And then once it started I can take out the current limiting circuit, if I’m correctly understanding the way these types of transformers work. I can’t wait to get my hands on one to try to apply it to a CLASS A audio amplifier. But in your previous video you mentioned about the noise that might be an issue.
You may want to wait until the next video as there are some other things to be aware of. An FR transformer could cause a lot of 'noise' and in an amplifier the load variation may cause issues. Also note in the video that the AC voltage was 44V and the DC was 54V (in a normal transformer system then something closer to 44V and 61V would be expected). They are also 'mechanically' noisy.
Jerry Walker thanks for the updated info. Then maybe not so suited for audio linear power supplies. Awaiting your next video 👍
Very interesting transformer that I had never heard of. Thank you!
I wonder how the capacitors influences the power factor. My guess it that it will be low at low loads but I wouldn’t even guess what it would be at high loads.
The capacitor is part of a resonant circuit which includes the secondary core flux and is only there to push the core into saturation. The primary current is surprisingly isolated. Power factor is very poor if the transformer is operated outside the resonant range but in normal operation is much better. I will show the primary and secondary and capacitor current waveforms in the next video.
Jerry Walker
Tx! I was ‘afraid’ 😉 you were going to discuss it in the third video.
How can I decrease the output voltage.is my cap getting week?
Please help me for my dialysis machine, its came with 120v60hz input, 24v 15amp output, 30uf capacitor,...... How can i calculated for modify for same input output on 50hz supply....Or haw can i calculat a new transformer for 50hz on same input output...i have knowledge about general transformer winding calculation.. Please help....
wishing you all the best🙏👏👏👏👏
jontscott - 2020-03-09
Look forward to seeing it in operation, neat that it can handle overloads gracefully. I would enjoy seeing the waveforms (voltage and current would be cool) to help better picture what is going on when it regulates over different voltage inputs.