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
part of the issue may be the input current limit circuit itself. the thermistor starts as a higher resistance when cold and limits the inrush current to the caps. When it heats up, resistance drops to near zero. Now turn off the power and back on before the thermistor cools down, but long enough for the caps to be discharged. on the next start cycle, thermistor can't do it's job and lots of inrush current to the caps.
do that enough times and you could end up with a cap failure or a thermistor failure. Proper choice of thermistors takes some care and design thought. I suspect lot's of time that isn't done.
do that enough times and you could end up with a cap failure or a thermistor failure. Proper choice of thermistors takes some care and design thought. I suspect lot's of time that isn't done.
