Timeline for How find the optimal frequency of a high frequency transformer
Current License: CC BY-SA 4.0
5 events
| when toggle format | what | by | license | comment | |
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| May 2, 2019 at 18:02 | comment | added | Blu eyes | @Oscillonoscope, I understand how to measure the SFR, having access to a signal generator and an oscilloscope this should be feasible, I don't understand how chose the right frequency. For example, assuming that I measured the SFR of my transformer, let's call it X, now assuming that I'm far below the limit of the switching device, that the critical frequency of the capacitor is Y and that the minimum switching frequency is W, what is the optimal frequency in the range (W<->min(Y;X/k)), where k>1 is a factor to "decide" the "safe area" below SFR; | |
| May 2, 2019 at 17:39 | comment | added | Charles H | @Blueyes There are concrete methods to find SRF like the one I cited in the answer. However, they might depend on what equipment you have to test with. The capacitor critical frequency is typically given on the data sheet though. | |
| May 2, 2019 at 17:34 | comment | added | Blu eyes | So, If I understand correctly the frequency needs to be a way lower than the self-resonant one, lower than the capacitor critical frequency and must allow the mos to full turn on and off. Can I find this with the trial/error method, ie sweeping through the frequency spectrum and picking the one that offers the maximum efficiency, or there's a more concrete/theoretical method? | |
| May 2, 2019 at 17:24 | comment | added | John D | Faster switching also increases core and AC loss, which might be more of a limiting factor than the parasitic capacitance or self-resonant frequency. | |
| May 2, 2019 at 16:59 | history | answered | Charles H | CC BY-SA 4.0 |