Hi mr.silvio ,, ye i understand now. I want to ask about the primary transformer scroll, which one is better, 18 rounds for primer, or 22 rounds, because the transformer I use now has 22 turns. If i use 2 bundle 0.5x3 ,, if 18 rounds, what is the distance of margin, if if heat transformer will decrease performance, ???
The number of turns all depend on the type of material in the transformer. The N87 type or PC40 can take 18 turns primary at 65Khz.
The transformer will work with a flux density of around 1600 guass.
If the material of the transformer core is not known it is better to use 22 turns for primary because not all material will have the same effect with same number of turns. If flux density is too high then transformer could saturate.
Regarding the margin clearance it is important that you do not have less than 2mm on the sides of each winding. If there is more no problem it will work the same
For current handling of copper wire we use 6amps per mm² For Audio
so for 6 wires by 0.5mm = 0.25 X 0.25 X 3.142 =
0.1963 mm² This is the area of 1 wire
for 6 wires = 0.1963 X 6 = 1.1778 so for audio we use 6 amps per mm² so 1.1778 X 6 = 7 amps.
7 amps are a little low for 1200 watts primary current for 1000w = 1200w / 155v = 7.7 amps
I used 1200 watts because the smps will be around 80% efficient so to give 1000w smps will consume around 1200w in primary
I think that 7 wires will be more appropriate
In my SMPS I used 8 wires for primary and also 8 wires for secondary of 80-0-80
Your smps at 100 volts secondary will consume 10 or 11amps
So you need 0.196 X
10 wires = 1.96 mm² X 6
11.7 amps
Regards Silvio
