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Old 19th February 2008, 06:29 AM   #1
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Default selecting ETD core for half bridge SMPS

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
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Old 19th February 2008, 06:54 AM   #2
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You may find that

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

is of help.
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Old 19th February 2008, 09:14 AM   #3
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for 300W at 100khz an ETD34 core, 3C90 or N67 material is ok.ETD44 core is for 600-1000w output power.
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Old 19th February 2008, 10:08 AM   #4
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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.
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Old 19th February 2008, 04:09 PM   #5
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Hi

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