Timeline for What causes spikes on a primary push-pull transformer with good snubber and tvs?
Current License: CC BY-SA 4.0
10 events
| when toggle format | what | by | license | comment | |
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| Apr 21, 2022 at 7:51 | comment | added | Ambroise | Yes I tried to measure the leakage inductance but I didn't succeed due to lack of material (shorted secondary method). I tried several values of capacitor with a variable resistance of power 100ohms and 10ohms. I found the ideal 10nF 2ohms pair but the resistor (2W) was getting very hot so for the efficiency of the converter I left the snubber in place. | |
| Apr 19, 2022 at 17:33 | comment | added | user4574 | Did you at any point measure the transformer leakage inductance and MOSFET capacitance so you could determine the optimal snubber values? The ringing on your scope plots appears to be under-damped, which suggests the wrong combination of snubber capacitance and resistance. | |
| Apr 19, 2022 at 16:49 | vote | accept | Ambroise | ||
| Apr 19, 2022 at 16:49 | answer | added | Ambroise | timeline score: 2 | |
| Apr 12, 2022 at 19:00 | comment | added | Verbal Kint | The best, perhaps, is to compare the primary currents in both legs and check the slopes: any significant difference between the two would indicate something suspicious with the transformer or elsewhere. | |
| Apr 12, 2022 at 7:29 | comment | added | Ambroise | Thanks, I understand much better. But then in my case, it would be more a defect of winding on the 2nd arm? | |
| Apr 12, 2022 at 7:26 | history | edited | Ambroise | CC BY-SA 4.0 |
added 41 characters in body
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| Apr 6, 2022 at 18:38 | comment | added | Verbal Kint | Alas, the perfidious leakage inductance is also at work in a push-pull converter. No, a gap does not affect the leakage inductance. It does affect the magnetizing inductance but not the leakage term which depends mostly on the winding geometry. It was long time ago demonstrated by Drs. Cuk and Middlebrook. | |
| S Apr 6, 2022 at 18:10 | review | First questions | |||
| Apr 6, 2022 at 21:09 | |||||
| S Apr 6, 2022 at 18:10 | history | asked | Ambroise | CC BY-SA 4.0 |