Did someone knows what are the current capabilities of the standard D-sub (aka Cannon) connector. I want to use it for power source connection together with the signal.
I need pretty high currents - something like 10A or even higher and also, I can use several pins for this task. Even more pin connector (15 or 25 instead of 9) is acceptable.
Special modifications (special power D-sub connectors) are not acceptable. I want to keep the element base very standard and cheap.
Did someone has personal experience with such D-sub use?
After some not very informative search, I decided to make some experiment. I connected all the pins in a pair of D-sub 15 pin connectors in series and then connected it to a 3A current source. This way, through the whole connector, 45A of current is flowing (15pins x 3A each). The total voltage drop on all pins is 0.12V and the power is 0.36W total. Now I will leave it for a while in order to see how it will degrade with the time.
Experimental results 1
After 1 hour of work on 3A per pin (45A total) the temperature of the external metal body of the connectors raised to 39 deg. Celsius (27 deg ambient temperature). The average contact resistance is 3mOhms per pin. I leaved it to work for a night and tomorrow will try to couple/decouple them several hundred times and to check what will happen.
Experimental results 2
After a night of work nothing changed. The body temperature is stable, 12°C above the ambient temperature. After several tents of times coupling/decoupling under voltage, the contact resistance has been increased from 2.4mΩ to 2.7mΩ per pin.