Timeline for Maximizing power transfer from 50Hz AC line via toroidal current transformer
Current License: CC BY-SA 4.0
11 events
| when toggle format | what | by | license | comment | |
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| Jul 21 at 6:17 | comment | added | Frog | @Tim Williams yes I see, thanks for clarifying that | |
| Jul 21 at 5:40 | comment | added | Tim Williams | @Frog What counts is the winding number around the core. Even if current went entirely to infinite distance, the fact that it returns through a loop at all is sufficient to count one. Doesn't matter if the loop is a short loop hooked around the core or a straight wire :) | |
| Jul 21 at 5:32 | comment | added | Frog | Surely the turns count for a straight wire is 0.5 as the wire effectively sweeps 180 degrees (in one side and out the other)? | |
| Jul 21 at 5:24 | comment | added | Tim Williams | Oh yeah good spot, I must've fat-fingered 172/50, hah. | |
| Jul 21 at 5:23 | history | edited | Tim Williams | CC BY-SA 4.0 |
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| Jul 21 at 1:34 | comment | added | Tim Williams | PF=1 improves the core area by 19% over square wave (see the ratio above), but this is fairly marginal. There could be other factors to consider in the full design, and making a proper symbolic model of the transformer (wire length, cross-section, dissipation, core volume..), and everything else, would help determine a more completely optimal overall solution. | |
| Jul 21 at 1:02 | comment | added | Cliff Pennalligen | Thanks. A plain diode or synchronous rectifier just flips the negative side of the current waveform resulting in average power factor, right? Does unity power factor increase the throughput, or the core remains the constraint? | |
| Jul 21 at 0:55 | comment | added | Tim Williams | Sort of. A synchronous rectifier might smaller as it has almost no switching loss, and no filtering required. Diodes may be smaller, depending on supply voltage and ability to dissipate heat. The transformer (and line, depending on how much emission the power company tolerates for this thing) may suffice for filtering, or more may be required. | |
| Jul 21 at 0:29 | vote | accept | Cliff Pennalligen | ||
| Jul 21 at 0:29 | comment | added | Cliff Pennalligen | Thank you for the steer. Now CHEMMAT courses are coming back to me... So the power constraint is around the ability of the magnetic material to transfer it. Will plan accordingly. When you say "A switching converter could also be used, but then the converter could simply be controlled for PFC operation, and you're back to the first case." - I figure I need to convert to DC anyway, so might as well do it through a transistor H-bridge and do PFC correction. I assume an architecture similar to the second link I posted would work, unless you otherwise correct me. | |
| Jul 20 at 22:37 | history | answered | Tim Williams | CC BY-SA 4.0 |