Timeline for What causes this resistor to fail - open circuit and no visible damage?
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| May 18, 2014 at 10:35 | comment | added | Brian Wang | Thank you for the advise. I will talk to our hardware engineer to see if they can be done. The high voltage side of the board is not connected to the earth, I think. | |
| May 17, 2014 at 14:59 | comment | added | Andy aka | Given that the diode bridge is also subject to the same potential voltage spike and if that has no known failures I'd consider upping the spec of the resistor to exceed the voltage ratings of 600Vpk, 420Vrms. Other than that I'd consider putting X or Y rated capacitors on hot and neutral to earth after the common mode choke, maybe 47nF or greater. Another idea is to derive your sync pulse with a capacitor dropper from either live or neutral to earth. Another idea is to dispense with the earth connection completely - does it need to connect to earth? | |
| May 17, 2014 at 14:28 | comment | added | Brian Wang | Do you have any suggestions on how to protect the board as a whole from lightning strikes? Is the MOV, R5, at the mains input too slow for that? | |
| May 17, 2014 at 7:00 | history | answered | Andy aka | CC BY-SA 3.0 |