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12th May 2005, 07:21 PM
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#1 |
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diyAudio Member
Join Date: Jun 2003
Location: Italy
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How wrap transformer...
Hi to all..
I'm build some SMPS Push-pull topology. BUt i've the following doubt... How I should wrap the tranformer? Case 1) --------------- SECONDARY2 SECONDARY1 --------------- PRIMARY2 PRIMARY1 --------------- CORE Case 2) ----------------- SECONDARY2 ----------------- PRIMARY2 ----------------- SECONDARY1 ----------------- PRIMARY1 ----------------- CORE What's the correct one? |
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12th May 2005, 11:58 PM
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#2 |
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diyAudio Member
Join Date: Jan 2003
Location: Milwaukee, WI
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#2. More coupling means better HF performance.
Tim
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See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!" |
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13th May 2005, 06:23 AM
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#4 |
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diyAudio Member
Join Date: Aug 2003
Location: SIMI VALLEY CA
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xfr
Interleave the primaries and secondaries as many times as possible. Reduces leakage inductance. WE typically split our high frequency switching supply transformers into 3 primary and 3 secondary windings.
So lay primary 1, then sec 1, pri 2, sec 2, pri 3 and last sec 3 Steve 
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13th May 2005, 02:06 PM
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#6 |
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Did it Himself
diyAudio Member
Join Date: Nov 2003
Location: Gloucestershire, England, UK
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Interleaving is only good for transformers driven by H bridge. If the topology is of the centre tapped primary type, there will be small mismatches between the two primary windings causing gradual shift towards saturation. If the centre tapped primary type is to be used you should wind bifilar, i.e. two runs of wire wound at same time.
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