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Old 28th May 2011, 08:33 PM   #31
luka is offline luka  Slovenia
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I would still let him do it, you will understand it as you should if someone explains what is what, and what does what, and so on...to say nothing else, he is good at what he does here!
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Old 28th May 2011, 11:25 PM   #32
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Hi Sekhar!
Of course I do not want to kill your DIY spirit.
Originally you contacted me for support on some inductor questions.
In the mean time I understood, that you are going to learn the entire SMPS topic from scratch.
Basically there is nothing wrong with your intension, but I am not able to spend enough time on your project to give you the required support.

One more comment:
I am not aware of your skill set.
You do not need to be a SMPS specialist, but please do not step into DIYing of offline SMPS, without good knowledge and experience in mains voltage appliances and the required survival rules.

Take care
Markus
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Old 29th May 2011, 07:48 AM   #33
sekhar is offline sekhar  India
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my frnds thanks for the due concern.............. I think i have the required skillls in electronics to work with offline smps......
Just point out my mistakes and tell me hw to correct them..............


regards
sekhar
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Old 9th July 2011, 05:43 AM   #34
sekhar is offline sekhar  India
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my dear frnds........
my inductor works.........it has worked fine for 350W with a pf 0f 0.97-0.99 from 90V to 270V.............

regards
sekhar
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Old 12th July 2011, 06:44 AM   #35
sekhar is offline sekhar  India
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i have a little problem ...........at 90V the inductor gets very hot with 400W output .........any help


regards
sekhar
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Old 13th July 2011, 02:47 PM   #36
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The inductor may be saturating. You can check this by looking at the current through the current sense resistor.
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Old 16th July 2011, 07:41 AM   #37
Audia is offline Audia  United States
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what core you are using?
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Old 16th July 2011, 10:53 AM   #38
sekhar is offline sekhar  India
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core etd 34 with N87 grade.....................


regards
sekhar
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Old 17th July 2011, 10:33 AM   #39
Audia is offline Audia  United States
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Quote:
Originally Posted by sekhar View Post
@audia
core etd 34 with N87 grade.....................


regards
sekhar
hmmm


Circuit optimization with that core wont be an easy task, I saw in commercial SMPS ETD29 at 100KHZ doing ONLY 400W (music).

I think you should spend more time doing some research for best cores for PFC.

Dont forget, Mosfet, Diodes, every thing will affect performance of your PFC.

No idea about your budget for this project.
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