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
Salvo wrote:
That's right, the energy of the capacitor (1/2 CV^2) has nothing to do with this. Why mention it?
The energy absorbed by the thermistor is I^2 * R * t. Where I is a exponential function of the RC time constant.
Salken white wrote:
The energy stored in a capacitor is what the thermistor must absorb, and while the energy stored is determined by the (CV^2)/2 equation, the initial movement of charge (current) is the issue.
:h
Ummm, the thermistor must have a higher energy rating in joules than the capacitor's initial energy storage or it will fail...
It must also limit charge/current or the devices its supposed to protect will have all of their smoke let out...
:R
