Suggestions for my SMPS

skb · 12th April 2012, 06:20 PM

Hi all!

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

Mainboard:

Driver board:

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

eem2am · 12th April 2012, 07:42 PM

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.

skb · 13th April 2012, 02:24 PM

Quote:

Originally Posted by eem2am

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...?

12th April 2012, 06:20 PM	#1
skb diyAudio Member Join Date: Apr 2012	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: Driver board: 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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12th April 2012, 07:42 PM	#2
eem2am Banned Join Date: Jun 2011	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.