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Old 11th March 2008, 12:54 PM   #11
luka is offline luka  Slovenia
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Hi

If I did get from ETD44 @ 50kHz 730w continuous power, 1kw peak (because of not big enough input C)...Try and you will see, make full bridge, get ETD, use 50/50 duty cycle and load secondary, then you will see what you can get
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Old 11th March 2008, 12:59 PM   #12
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Can somebady tell me where i can find a documentation with layout ?
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Old 11th March 2008, 04:09 PM   #13
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Is this ferrite good for gate trnsformer :E20/10/6-3C90





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Old 11th March 2008, 07:01 PM   #14
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Quote:
Originally posted by EWorkshop1708
How big of a toroid core is needed for this kind of power???

I'm also interested because an SMPS of large size can be used to make power inverters as well as amplifiers.

Would a 3 or 4 inch toroid be large enough?

E-

Instead of the one-BIG-toroid, how about several smaller toroids, secondaries in series. The primaries would each be driven by their own MOSFET Pair/Quad. I have a schematic for a 2.5kW DC-AC Inverter that uses 8 transformers in this arrangement. Forces equal current-sharing and gives you the power level you want.

Say, 10 toroids with their secondaries in series, and each primary driven by its own set of MOSFETs off the 330VDC bus. This would enable ten half-bridges, or five cores for five full-bridges.

Attached is a copy of the power stage for the 2.5kW inverter.

Hope this helps,

Steve
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File Type: pdf power stage.pdf (65.6 KB, 2016 views)
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Old 12th March 2008, 01:12 PM   #15
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How can i calculate the power trnsformer?
I must say that the only smps that I build was a car one @100w







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sorry for my english
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Old 12th March 2008, 09:02 PM   #16
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Quote:
Originally posted by N-Channel



E-

Instead of the one-BIG-toroid, how about several smaller toroids, secondaries in series. The primaries would each be driven by their own MOSFET Pair/Quad. I have a schematic for a 2.5kW DC-AC Inverter that uses 8 transformers in this arrangement. Forces equal current-sharing and gives you the power level you want.

Say, 10 toroids with their secondaries in series, and each primary driven by its own set of MOSFETs off the 330VDC bus. This would enable ten half-bridges, or five cores for five full-bridges.

Attached is a copy of the power stage for the 2.5kW inverter.

Hope this helps,

Steve

Seems like a better solution. Where could I get 4 or more identical cores 2-3 inches or so?
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Old 12th March 2008, 09:32 PM   #17
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Quote:
Originally posted by EWorkshop1708



Seems like a better solution. Where could I get 4 or more identical cores 2-3 inches or so?

Stores that sell these in Canada are abundant. They are called donut shops.
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Old 13th March 2008, 06:54 AM   #18
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Originally posted by rcavictim



Stores that sell these in Canada are abundant. They are called donut shops.
LOL
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Old 13th March 2008, 06:11 PM   #19
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4x irf450 would be good for 2.6kw or i would need to double them?
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Old 13th March 2008, 07:14 PM   #20
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I recently bought a 1500 watt 12 volt to 120 mod sine inverter that appears to be built as the 2.5 kW supply described above in that my unit has 8 banks of two mosfets driving p-p xfmer primary with associated fuse. The mosfets on the transformers are heatsinked on the bottom side of the case as seen in this photo. I must say for a measly 1500 watt inverter this baby is really overbuilt!

In comparison I have a few Xantrex X-Power 1000 watt inverters and they contain only two such transformers of about the same size to make the 160 VDC rails for the output switches.
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