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I just wanted to ask you one more question!
About the forward converter compensator.
I constructed and tested voltage mode controller for buck converter and it was working very good.
The parameters of forward converter are the same (same L,C, R and turns ratio is 1), so I tested it on forward...
Thank you everyone for your help! Sorry I wasn't here these days, I was very busy.
In the meantime I've tried adding snubber and it helped reducing voltage spikes. Now the spikes are about 100 V. I don't think that solved the problem because the MOS waveforms still don't match the regular...
If I wind 32 turns on my tertiary winding, then the maximum (allowed) duty cycle is 0.5, right?
Can you please give me more detailed explanation why should I try with more turns on tertiary winding?
I've read about some examples where P:T was also 2:1, but I've never heard about that problem...
Hi Goldsmith!
I'm using 32 turns for primary and secondary and 16 turns for reset winding. PExprt calculations showed everything was ok
I'm using single ended I guess :)
I'm still hoping it's snubber cause it's easier to modify, but you're the expert :)
I have RCD snubber fo flyback (D in series wit RC parallel (R=8k, C=47nF)). The biggest problem is time, I have my diploma thesis defense on Friday :)
...so I will first try with what I have. If that wouldn't work, I'll try with RC :)
Of course, I understand.
The transformer was wounded by our laborer by hand so that could likely be the problem.
I'll try to add RCD snubber in parallel with primary winding (the same as for flyback) and see what will happen
Thank you for your reply :)
I know, what's the snubber, I used it on my flyback transformer and it's working like a charm :)
I just though I wouldn't need one on my forward converter.
Am I right about high leakage inductance causing the spikes?
Hi everyone,
I had to design and construct flyback and forward converters for my Power Electronics course project. After testing and measurements the flyback converter is working like a charm, but I have some issues regarding my forward converter. :)
Here are some specs:
Input voltage 25V...
Can you give me a simple explanation why, please? :)
...because the second one has more sense to me. Anyway I believe you're right, I'm still new in magnetics :)
I don't know if it is important in this case, but just to mention, both my primary and secondary windings are placed on central leg
I have one small doubt regarding to flyback core air gap :)
As I live in a crappy country, I could only get RM 14 core with no air gap, so I have to make my own.
My calculated air gap is about 0.2 mm.
So I've put spacers (paper) in each leg (0.1 mm each gap). Which gap length should I achieve...
Well, as I can remember my friend used regulator with two zeroes and three poles. The goal was to achieve lead-lag compensator. Here's little something.
This is a great literature, control theory in practice. Start from page 55. The compensator he used is described on page 69 (2.69)
hope it...
Here are the simuluations for all 3 non-isolated topologies :)
I asked my friend and he said he knows nothing about CCM, he's got some experience only with Voltage control :/
Could you send me your flyback model, just to check it out? :)
btw. I'm using Simplorer 9, but that won't be a problem
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