Converter In-Rush Thermistors etc, UPDATE -4
UPDATE on 17 Nov, Update 2 on 22 Nov, Update 3 on 16 Jan 14, Update 4 on 19 Oct 14. --------------- In a recent thread there was mention of how you can wreck your gizmo (in my case a converter) ...
Forum Discussion
BFL:
you've had several failures of the thermistor. Why not send it back to the mfg and have them run through it and make sure something else isn't working and has failed and is causing the thermistor failures???
if they find nothing, then you could keep experimenting.
swapping/changing thermistors may move the failure from one area to another. The thermistor needs to protect the input circuit from excessive inrush current,then allow normal operation. And the input protection needs to make sure a fast off/on cycle doesn't cause problems either. you could end up with a thermistor that survives off/on cycles fine, but ends up causing a failure over time for the inrush. It's not just the magnitude of inrush but also the rate of change that can affect reliability.
you've had several failures of the thermistor. Why not send it back to the mfg and have them run through it and make sure something else isn't working and has failed and is causing the thermistor failures???
if they find nothing, then you could keep experimenting.
swapping/changing thermistors may move the failure from one area to another. The thermistor needs to protect the input circuit from excessive inrush current,then allow normal operation. And the input protection needs to make sure a fast off/on cycle doesn't cause problems either. you could end up with a thermistor that survives off/on cycles fine, but ends up causing a failure over time for the inrush. It's not just the magnitude of inrush but also the rate of change that can affect reliability.
