Electronics > Projects, Designs, and Technical Stuff
Connector sparking and damage due to inrush at "mating" time?
Gyro:
Of course it's treez, who else thanks every post regardless. :-DD
Also: https://www.eevblog.com/forum/renewable-energy/contactor-sparking-with-multi-kw-equipment-is-just-normal-accepted-practice/
tggzzz:
--- Quote from: Gyro on August 31, 2020, 05:36:04 pm ---Of course it's treez, who else thanks every post regardless. :-DD
--- End quote ---
Shush! He could easily change that characteristic tell-tale, thus making identification a little less trivial and obvious.
The evidence is that he can't change his posting style and content, though. :)
silverback:
what about the poor old capacitor surge current
jbb:
Sounds like your management subscribes to a time honoured management tradition: “We don’t have time to do it right but we do have time to do it twice.”
I suspect you won’t get near the lifetime you want, so I suggest you actually test it. Get yourself a fully charged battery and a board and cycle that sucker. Plug it in, unplug it, wait for 82uF cap to discharge, repeat (add a fair load to 5V output to discharge cap).
I suggest a pair of safety glasses in case it fails with sparks and some fine gloves so you don’t wear the skin off your fingertips.
bson:
--- Quote from: NiHaoMike on August 30, 2020, 10:00:17 pm ---Add a small resistor or NTC in series to reduce the inrush. Since your load is small, the additional losses will be minimal.
--- End quote ---
In particular, put the NTC on the supply side of the connector to keep the voltage down and hence minimize arcing.
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