papasteack2
New member
Hi,
I'm planning of doing a smps with a ncp1653 @66khz boost pfc, and a unregulated half bridge ir2153d smps for running a amp based on composite lme49720/lm3886 in bridged mode using remote sensing (amp name is bato mm) =>4 lm3886.
I've readen a lot of thread, here and on diyaudio...lot of datasheets too. Now, i need help to compile and understand everything. As a hobby, i want to do it myself, trying to do things well, and satisfying myself. I know it would be cheaper to buy one psu new.
My first question is about the voltage output of the pfc stage. At minimum, the worksheet of the ncp1653 allow it to output 375V. So would there be any advantage of running the half bridge converter with higher voltage? I know it would need higher voltage caps and mosfet... For primary cap, i plan to put 2x1000uf 250v low esr 105°C if running at 375v.
I've gotten the ncp1653 boost inductor. For the half bridge, i have some atx psu transformers. To get symetrical output, i'll probably run two identical transformers in parrallel.
I've read some advices on the web, telling to run atx psu transformer around 40khz. Does using two identical transformer in serie would allow to run higher frequency ? Would there be real advantage? It seems that higher frequency are easier to filter.
And finally, i see often inductors on secondaries. Inductors filter seems complicated to tweak. It seems to be better to put after rectifiers a LC filter...and not a CLC..don't understand for now. Maybe in few years, learning, i'll understand. For now, i need help. From what i've seen and understood, i would put a 7mh common mode 14A inductor and 7500uf x4 105°C low esr caps. CRC filter would be easier, but it seems me it loose the advantage of fast current supplying... For layout, i'll do as reference designs.
I go for simple half bridge topology because it seems me doable with my actual level.
Thanks for helping me cleaning my knowledge, explaning and sharing your own experience and knowledge !
(and sorry for my poor english !)
Damien
I'm planning of doing a smps with a ncp1653 @66khz boost pfc, and a unregulated half bridge ir2153d smps for running a amp based on composite lme49720/lm3886 in bridged mode using remote sensing (amp name is bato mm) =>4 lm3886.
I've readen a lot of thread, here and on diyaudio...lot of datasheets too. Now, i need help to compile and understand everything. As a hobby, i want to do it myself, trying to do things well, and satisfying myself. I know it would be cheaper to buy one psu new.
My first question is about the voltage output of the pfc stage. At minimum, the worksheet of the ncp1653 allow it to output 375V. So would there be any advantage of running the half bridge converter with higher voltage? I know it would need higher voltage caps and mosfet... For primary cap, i plan to put 2x1000uf 250v low esr 105°C if running at 375v.
I've gotten the ncp1653 boost inductor. For the half bridge, i have some atx psu transformers. To get symetrical output, i'll probably run two identical transformers in parrallel.
I've read some advices on the web, telling to run atx psu transformer around 40khz. Does using two identical transformer in serie would allow to run higher frequency ? Would there be real advantage? It seems that higher frequency are easier to filter.
And finally, i see often inductors on secondaries. Inductors filter seems complicated to tweak. It seems to be better to put after rectifiers a LC filter...and not a CLC..don't understand for now. Maybe in few years, learning, i'll understand. For now, i need help. From what i've seen and understood, i would put a 7mh common mode 14A inductor and 7500uf x4 105°C low esr caps. CRC filter would be easier, but it seems me it loose the advantage of fast current supplying... For layout, i'll do as reference designs.
I go for simple half bridge topology because it seems me doable with my actual level.
Thanks for helping me cleaning my knowledge, explaning and sharing your own experience and knowledge !
(and sorry for my poor english !)
Damien