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Old 12th April 2012, 06:20 PM   #1
skb is offline skb
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Join Date: Apr 2012
Default Suggestions for my SMPS

Hi all!

Ive been researching and designing a pretty straight forward halfbrigde smps lately, i would like your inputs on it.

Mainboard:
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Driver board:
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What do you think?

Im a little unsure about PCB layout, and unsure about both primary and secondary side filter..

Output should be about 80V and 30A. Audio usage.
Ive built a prototype with somewhat different PCB layout but i had huge problems with noise, but it did push out 2.8kw / 39A @ 74V at 75khz for a couple minutes before core got to hot. Final type is supposed to be at 100khz

Soft-start board and current sensor-board is still to be designed.

Any suggestions for optimization?

Thanks
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Old 12th April 2012, 07:42 PM   #2
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hi i dont see fan....you need fan for that power level.

i dont see pfc stage.....with that power you cannot realistically do it without pfc.....a simple rectifier bridge and cap bank input would pull too high current peaks.
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Old 13th April 2012, 02:24 PM   #3
skb is offline skb
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Join Date: Apr 2012
Quote:
Originally Posted by eem2am View Post
hi i dont see fan....you need fan for that power level.

i dont see pfc stage.....with that power you cannot realistically do it without pfc.....a simple rectifier bridge and cap bank input would pull too high current peaks.
Thanks for your input.

Fan controller is placed externally..

Ive seen many design with this amount of current without PFC...?
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