Offline full-bridge SMPS....need help

[chas1]

check posts #1157,A solution that might fit your needs

[gootee]

Originally Posted by agentgates

I can't remeber what was the performance of Stewin's PSU, but as for the core he used I presume it is above 70W, which means here in the EU the PFC would be mandatory for that PSU. I don't know the regulations in the US though but PFC is always recommended so IMHO it always worths the hassle.

As for the 110V, if you're lazy you can simply half the number of primary turns and adjust the frequency if necessary (and mind the core and FET temperatures!). Although I would strongly suggest using a transformer calculator to find the correct values.

Is using PFC mandated by EU law for every one-off DIY project that uses over 70 Watts?!!

[luka]

Originally Posted by gootee

Is using PFC mandated by EU law for every one-off DIY project that uses over 70 Watts?!!

I don't think so

[gootee]

Originally Posted by luka

I don't think so

Thank you. I hope not. That would be outrageous and disappointing.

[CECCO]

Originally Posted by chas1

check posts #1157,A solution that might fit your needs

Thanks Chas, I will read the paper and try to do some calculations.

[agentgates]

@gootee

No, that is a restriction for marketing them. You can build whatever you want I only mentioned it as a comparison as the other member was not sure whether to put a PFC to it or not. But yeah I forgot to mention my comparison does not touch upon DIY stuff.