etd34 nt enough for 400w pfc

sekhar · 21st July 2011, 09:20 AM

i am working on a 400w smps which has a pfc in front.
during testing i saw that the etd34 that i had used for pfc becomes very hot in 90v operation. so wat option do i have can i use 2 etd34 in parallel or in series..

help me out

regards sekhar

sekhar · 21st July 2011, 11:50 AM

come on every body can i use 2 etd34 cores in parallel for my pfc.

luka · 21st July 2011, 12:25 PM

I would do in series (not that have I even seen that)... or use higher freq.

zebedee · 24th August 2011, 11:34 AM

What frequency are you using?
Is the heat coming from the core or the winding?
If it's from the core, up the frequency.
If it's mainly from the winding then use copper foil rather than wire.
2 pairs of cores with the primary windings in parallel would halve the losses.

eem2am · 27th August 2011, 01:46 PM

is it in DCM?

you may need multiple windings for skin effect mitigation

sekhar · 29th August 2011, 04:08 AM

no it is working in ccm mode ....and i have already used multiple winding for my pfc inductor....

regards
sekhar

21st July 2011, 09:20 AM	#1
sekhar diyAudio Member Join Date: Jul 2009 Location: West bengal/siliguri	etd34 nt enough for 400w pfc i am working on a 400w smps which has a pfc in front. during testing i saw that the etd34 that i had used for pfc becomes very hot in 90v operation. so wat option do i have can i use 2 etd34 in parallel or in series.. help me out regards sekhar

21st July 2011, 12:25 PM	#3
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	I would do in series (not that have I even seen that)... or use higher freq. __________________ home page @ http://www.classdaudio.co.cc @ 24/7 all year long I FEEL SLOVENIA

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21st July 2011, 11:50 AM	#2
sekhar diyAudio Member Join Date: Jul 2009 Location: West bengal/siliguri	come on every body can i use 2 etd34 cores in parallel for my pfc.

24th August 2011, 11:34 AM	#4
zebedee diyAudio Member Join Date: Aug 2011	What frequency are you using? Is the heat coming from the core or the winding? If it's from the core, up the frequency. If it's mainly from the winding then use copper foil rather than wire. 2 pairs of cores with the primary windings in parallel would halve the losses.

27th August 2011, 01:46 PM	#5
eem2am diyAudio Member Join Date: Jun 2011	is it in DCM? you may need multiple windings for skin effect mitigation

29th August 2011, 04:08 AM	#6
sekhar diyAudio Member Join Date: Jul 2009 Location: West bengal/siliguri	no it is working in ccm mode ....and i have already used multiple winding for my pfc inductor.... regards sekhar

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