Morning all...
I know it's not easy for experienced guys to work with this kind of stuff, disregarding a bunch of technical details that are needed for this to work, even in a minimal environment. But the more details you plug in, the harder this becomes.
I made some simple calcs in my post #21 that were "contested" by @Jony130 and then fixed by me but I got no confirmation yet about if that fix is now more reasonable or not for the conditions given! Can anyone confirm it? I've been in this question in the last few days and I have exam in one week and I would like to post here more problems to try to solve them with your help!
Thanks
Psy
Hi,
Just to recap a little, i can see how we might place a largish inductor in series with the input to the buck. That would make the input filter of the buck a "choke input filter" and that is an option used in high power systems because the peak currents can be outrageous. I could even see a swinging choke there too, but a large one would be good for study.
So if we just take an SCR bridge like you have, and a standard buck circuit with large input caps withj low ESR, and connect the two grounds together and connect a large inductor from the output of the SCR bridge to the input of the buck, we have s system that meets the requirements of your problem statement and it is also practical.
The addition of the inductor actually makes the problem a little easier because the inductor makes it easier to calculate the reaction switch times of the SCR's (or diodes) which is very very hard to calculate with a capacitor input filter alone as load. The reaction swtich times are the times when the SCR's or diodes switch off, but can also be the times when they switch on if the gate pulse does not turn them on right away.
And yes, there are many times a difference between school work problems and real life problems until you get into higher technical education. The school problems are very good though, and as we see this one can be turned into a practical problem quite easily.