selecting ETD core for half bridge SMPS

[jegandren]

Hi all,

I'm currently designing a half bridge switch mode power supply, but im not sure the type of ETD transformer that would suit my project,

here is the spec of my power supply that i suppose to design:

Topology : half bridge
Switching frequency : 100 Khz
Output power 300 W
Input primary voltage +/- 240*sqrt (2) / 2 V
secondary voltage +/-55 V

can anyone help me what is the power that i can get from ETD cores such as ETD 34 to ETD 44, which suits my spec.

Thank You

 

[Ouroboros]

You may find that

http://schmidt-walter.eit.h-da.de/smps_e/smps_e.html#Spw

is of help.

 

[adi109cj]

for 300W at 100khz an ETD34 core, 3C90 or N67 material is ok.ETD44 core is for 600-1000w output power.

 

[Ouroboros]

I must admit that I wouldn't try to push 300W through an ETD34, but I tend to be cautious. I would use a 44 myself in N87 or equivalent.

 

[luka]

Hi

At 100kHz etd29 should be enough, but to be safe go for etd34 or larger