F5 monoblock power supply for 50Hz mains

[LostForWords]

Thanks for the help. I was a little surprised to see that the load was 1.5 amps when I expected 1.3 amps and curious how the value of 212 mOhm was calculated for the transformer. I assume that the combination of three capacitors is used to lower the overall ESR. Perhaps you can answer these queries as a final guesture of kindness. Many thanks - Nick

 

[Zen Mod]

Thanks for the help. I was a little surprised to see that the load was 1.5 amps when I expected 1.3 amps and curious how the value of 212 mOhm was calculated for the transformer. I assume that the combination of three capacitors is used to lower the overall ESR. Perhaps you can answer these queries as a final guesture of kindness. Many thanks - Nick

invoke help of PSUD and you'll find how I calculate 0,2R

lets say - 240V primary , 18V secondary , primary Rdc ~ 2R , secondary Rdc ~0R2

taking constant load of 1A5 is worse case than 1A3 , so why not

yes - 3 caps have 1/3 of one cap ESR

anyway - all these are just academic exercises .... considering that numerous PSU's were made with simillar approach

if you have enough greenies and patience and place - use chokes (CLC) ;

if not - use resistors (CRC)

and yes - read this : http://www.firstwatt.com/pdf/art_power_supplies.pdf

edit :

even better ...... go there : http://www.firstwatt.com/articles.html , and read them all ......

 

[DougL]

PSUD will not allow an inductor straight after the bridge

I was playing around with this. Its got a Nasty turn on surge, and requires an insane amount of capacitance to get the Q down without totally blowing the regulation, but it can be done. FYI, I do not really recommend this, but I thought you might find it educational.



Doug

 

[Zen Mod]

to prevent that - you must cheat

either putting small C right after bridge , or connecting RC cell across ( in parallel with ) choke

in any case - 1mF after bridge make wonders