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) ...
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The caps are feeding the constant power converter. As soon as input voltage goes up, current demand is reduced. There is no current surge.
On the other hand, during power-up, the converter does not turn on until the cap voltage (I'm guessing) is at least 120V. The requirement for current turn-on surge protection is still there.
Sal
On the other hand, during power-up, the converter does not turn on until the cap voltage (I'm guessing) is at least 120V. The requirement for current turn-on surge protection is still there.
Sal
lorelec wrote:Salvo wrote:
No, that's wrong. The converter will react to the input voltage surge in about 1 ms. That means the converter will just as fast reduce current supply into the caps. It's a closed loop system. The caps will never see a current surge.
The input filter caps are outside of the loop, though. If they were inside of the control loop, there would be no need for inrush limiting.
