Timeline for What could be the cause of high leakage inductance on my custom flyback transformer?
Current License: CC BY-SA 4.0
15 events
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| Feb 14, 2021 at 19:32 | comment | added | John D | At this point I'm not sure why your leakage is so high, but @winny's suggestion of interleaving the secondary and primary usually helps. Transformer design is often an iterative process. | |
| Feb 14, 2021 at 19:17 | comment | added | willieb3 | @JohnD Centre leg was ground down by the manufacturer (TDK electronics). Solder joints are bad as I had to quickly re solder to take the photo. | |
| Feb 14, 2021 at 18:47 | comment | added | winny | ”Secondary turns: 6 trifilar” From the look of it, it’s 3xsome wire guage in parallel, but it’s not trifilar. Try to wind it bifilar, usually with half of your primary turns, tape and margin tape, secondary turns, tape gain and then the remaining half of your primary turns. | |
| Feb 14, 2021 at 18:31 | comment | added | John D | I don't see anything obviously terrible except the solder joints on your shorting wire. The gap between the bobbin and the core shouldn't have any impact. Is your center leg ground to make the gap, or did you use spacers on all 3 legs? It's hard to tell from the diagram. | |
| Feb 14, 2021 at 18:22 | comment | added | willieb3 | @MicroservicesOnDDD I have updated the post with additional details. | |
| Feb 14, 2021 at 18:21 | history | edited | willieb3 | CC BY-SA 4.0 |
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| Feb 14, 2021 at 18:18 | comment | added | willieb3 | @JohnD I have updated the post with additional details. | |
| Feb 14, 2021 at 18:15 | history | edited | willieb3 | CC BY-SA 4.0 |
added 1132 characters in body
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| Feb 14, 2021 at 10:05 | review | Close votes | |||
| Feb 17, 2021 at 16:33 | |||||
| Feb 14, 2021 at 4:22 | comment | added | MicroservicesOnDDD | Also, flyback has to store energy, but if your gap is too big, you will have too much leakage. Also, some iron powder cores have distributed gaps, which is hidden because it represents how connected the powder is. May we please have more details? Thanks ahead of time. | |
| Feb 14, 2021 at 4:18 | comment | added | MicroservicesOnDDD | I think that the volume of copper should be the same for both windings for best coupling (same # of Cu atoms). If you are using the same guage for primary and secondary, then with 143 turns on the primary, then the secondary should have 6 turns of 24-filar winding. Or 6x3x8 alternatively 8 paralleled windings of 6 trifilar. But that's only if you are using same thickness wire throughout, I believe. | |
| Feb 14, 2021 at 3:46 | comment | added | D.A.S. | Only 80% coupling? No core or capped. | |
| Feb 14, 2021 at 3:43 | answer | added | electrogas | timeline score: 2 | |
| Feb 14, 2021 at 3:21 | comment | added | John D | You would have to show the details of your construction for anyone to have any chance at answering that. A picture and a diagram of how the windings are wound with dimensions would be helpful. It certainly sounds like incredibly high leakage so you may want to add exactly how you made the measurement. | |
| Feb 14, 2021 at 3:18 | history | asked | willieb3 | CC BY-SA 4.0 |