for multi-parallel turns:................... estimated irf740 will go 500-600 watts and irfp460 will be more maybe 1kw. to reach this we must use at least etd49 core with multi strand wire awg 22-29. .
for standard winding i`ve use 12 + 12 for the primary with 6 strand AWG29.
because this smps is no feedback and always run at 50% duty cycle, the output voltage estimated about 6vdc per turn.
so if we wound 6 turn with AWG29 ( i use 8 strand)
for multi-parallel turns:
are the separate wires for each Turn insulated from each other as in enameled copper wire.
are the separate wires for each Turn just plain copper with an overall insulating jacket?
are they Litz wire?
It looks from the replies that Litz wire is not required.KX36
Thanks for explenation !
I mean ''skin'' wire diameter with skin depth 0.24mm at 100Hz the wire is roughly 0.5mm (am I correct ?).
Could you tell me the 2.5-3A/mm2 it is RMS value of current ?
it is my first post in diysmps
after reading and learning IR2153 based smps from this forum, especialy thread from norazmi(this thread) and microsim, i built my smps.
many thanks for norazmi and microsim
it use IR2153D
i use cheap refurbished 2SK3528 from fuji electric
the core is EER53, the dimension match with datasheet but other core parameter i dont know, i think it's from china, i got it from local shop only for 3,2 USD (35ribu rupiah)
the primary transformer : 11+11 turn (4x0.5mm wire)
secondary : 5+5 turn (4x0.8mm) = 35-36volt
aux : 3 turn (1x0.5mm)
i have tested using dummy load connected from positive rail to ground and got approximately 400W (32v x 12,5 ampere)
dummy load is limited to 48 volt(it is electronic dummy load, i see lot off TO3 transistor there) so i cannot push it hard using 70volt(plus and minus rail)
i don't have real device (amplifier) that required high power so i am quite happy for 400W for now
and why i choose EER53 because I only found this ungapped core on the shop, all the other core has a gap
any advice is welcome
Very good, and nice PCB.
It looks you have used another circuit?
+-42VDC, 10A is 840W?That's geat res_smp.
I have core EER40D with no gap.
If my target +-42VDC 10A, is it possible?
Stewin, nice work!
Your schematic is missing the output filter coils.
In my case I used a 2 x 22 uH. Don’t forget!
You can use a EI33 from an old PC smps. Should have a 0,1 mm gap. ( pieces of paper sheet).
TR1 should be 1:50 turns on iron powder core. (Small green core from a old computer board).
The Vaux. winding should be in the right phase otherwise Q1 will get hot really fast.
(Just invert the wires on the circuit if Q1 is get hot)
You can not extract 1Kw from the IRF740 maybe 700 W in a better case!
Better if you use the IRF460LC.
Give me a little time to recalculate the right number of turns for your ETD44.