Timeline for Transformerless BUCK SMPS for 1kV->12V
Current License: CC BY-SA 3.0
13 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jun 14, 2021 at 16:33 | answer | added | Kuba hasn't forgotten Monica | timeline score: 0 | |
| Feb 25, 2016 at 16:11 | vote | accept | FlegmatoidZoid | ||
| Feb 25, 2016 at 7:33 | comment | added | FlegmatoidZoid | I've edited original post to include cable specification. It seems that the recommended minimal insulation resistance is 100MOhm for 1kV and, accordingly, is 2.5kV for 500MOhm (my cable). | |
| Feb 25, 2016 at 7:27 | history | edited | FlegmatoidZoid | CC BY-SA 3.0 |
cable specifications added
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| Feb 24, 2016 at 22:04 | answer | added | Adam Haun | timeline score: 0 | |
| Feb 24, 2016 at 21:49 | answer | added | jms | timeline score: 2 | |
| Feb 24, 2016 at 21:16 | answer | added | Ali80 | timeline score: 0 | |
| Feb 24, 2016 at 15:55 | comment | added | user1582568 | If you cannot fit a forward mode transformer, I don't think you will be able to fit a suitable inductor for transformerless operation. Also, it is on the low voltage side that you will need synchronous rectifiers. | |
| Feb 24, 2016 at 15:43 | comment | added | user1582568 | For minimum space I would suggest forward mode with a transformer. If you use and inductor in buck configuration you have 2 problems. 1: the inductor has to have relatively high energy storage, so size is larger. 2: you will have a very low duty ratio for the switch, so you will need a very short on time which will be difficult to achieve with very high efficiency. | |
| Feb 24, 2016 at 14:27 | comment | added | Neil_UK | As Steve says, 1000v way exceeds the rating of telco cable, even if you have tested a bit on the bench (I have used mains flex for 10kV, and put 350v across enamelled copper wires, but neither of those are rated for that either). One defect in the insulation and you will have a problem. Run more current and allow yourself more voltage drop, or run a new cable. | |
| Feb 24, 2016 at 14:23 | comment | added | PlasmaHH | I would say the whole thing is a bad choice, besides the mentioned likely unsufficient rating of the cable you are creating quite some hazard there by running voltages onto cables where nobody would ever expect them to be. | |
| Feb 24, 2016 at 13:55 | comment | added | Steve G | You need to check the maximum voltage rating of the telco cable you intend to use. Standard (indoors) telco cable is only around 100V. | |
| Feb 24, 2016 at 13:39 | history | asked | FlegmatoidZoid | CC BY-SA 3.0 |