Inducor for grid tied inverter 3kw?

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treez

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Hello,
We are doing a 3kw Grid tied inverter. We need a 1mH inductor capable of carrying 25 Amps peak, and with 13 Amps RMS. Switching frequency is 17khz
(as per app note on page 23)…

https://www.st.com/web/en/resource/technical/document/application_note/CD00253868.pdf

We went through all the powder core torroids on mag-inc.com and they all need too many turns and are too physically big.
Do you know of a core material we can use with this and get a smaller inductor?
 

For low frequencies like 17 kHz, laminated iron respectively cut tape core with air gap is usually the preferred solution.
 
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Thanks, we cannot find off-the-shelf torroids of these, we found metglas but they don't seem to have torroid families
 

I didn't specifically refer to toroid form, rather thinking of SMxx transformer cores.

We went through all the powder core torroids on mag-inc.com and they all need too many turns and are too physically big.
Do you know of a core material we can use with this and get a smaller inductor?
Click to expand...
At which core size did you arrive? May be your expectations are unrealistic?
 
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Kool mu ...? supermendur...

yep at 17kHz, a fine metal tape wound core, cut, should give you acceptable core losses...
 
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