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
BFL13 wrote:
Thanks, so are you confirming that it is bad to restart "too soon" before the caps have unloaded?
If so, can you clear up whether the DC voltage tapering down on shut off is related to that unloading so that its timing will be an indicator of when it is "safe" to restart?
Yes I get a good snap on start-up sometimes, not always. Scared me at first, being gun-shy from wrecking my previous 100amper :(
Thanks!
When power is removed the caps should discharge at a rate equal to the time it takes for the thermister to again increase to it's cold resistance value. A bleeder resister is selected sometimes to get this right. Therefore tapering down the load should have little to do with this as this is all involving the input circuit.
A switching supply operates until it's input voltage drops below some spec then collapses to zero immediatly.
I suspect that in todays world they manufacture lots of these quickly and if some fail---oh well they will give you another one.
