Timeline for Three-phase mains AC/DC conversion to 12 V
Current License: CC BY-SA 4.0
13 events
| when toggle format | what | by | license | comment | |
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| Oct 8, 2022 at 17:09 | history | became hot network question | |||
| Oct 8, 2022 at 15:30 | vote | accept | rodv92 | ||
| Oct 8, 2022 at 13:59 | comment | added | brhans | Whatever power supply design you end up using - remember that large 3-phase supplies are typically capable of provide a very large current during fault conditions 10's of kA would not be unexpected. Make very sure that you adequately fuse the power supply inputs to your device and pay close attention to the "breaking capacity" of the fuses you use!. Expecting a piddly little 1A glass fuse to break the arc formed from a high current source is not going to work. I learned this lesson when I tripped a few very large breakers in an industrial facility a little over a decade ago :P | |
| Oct 8, 2022 at 11:04 | comment | added | winny | You are either not listening or not understanding. Forget about capacitive dropper for 10 W load. A meter like this should be doable with 100 times less power. That would be doable with a dropper. If you are set on 10 W, you need a 560 V DC capable DC/DC power supply. See Andy’s answer below for one. | |
| Oct 8, 2022 at 9:51 | comment | added | rodv92 | also for case 2 the ac coupling capacitor would have to be high voltage and possibly in the hundred uF range. so double out of question | |
| Oct 8, 2022 at 9:43 | history | edited | ocrdu | CC BY-SA 4.0 |
added 23 characters in body; edited title
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| Oct 8, 2022 at 9:41 | comment | added | winny | No no, without AC coupling via capacitor in series. A real power supply. Also, how come 10 W is needed just for some metering? | |
| Oct 8, 2022 at 9:40 | history | edited | winny | CC BY-SA 4.0 |
edited title
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| Oct 8, 2022 at 9:36 | comment | added | rodv92 | seems that for case 2 the dc component will be huge vl× 1.414 × 1.65 / sqrt(3). leaving not much ac after the ac coupling capacitor for the power module to work with. so i guess case 2 is out of the question. | |
| Oct 8, 2022 at 9:34 | answer | added | Andy aka | timeline score: 5 | |
| Oct 8, 2022 at 9:24 | comment | added | winny | ”not be 50 but 300 Hz. That would derate the performance of the transformer in the module” Why? How about just a power supply which can take 560 V DC input? | |
| Oct 8, 2022 at 9:23 | history | edited | winny | CC BY-SA 4.0 |
added 17 characters in body
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| Oct 8, 2022 at 9:04 | history | asked | rodv92 | CC BY-SA 4.0 |