I have an 18 V dc linear power supply rated for 7.5 A.
I am applying an electronic load at 2 A constant current prior to applying ac input to the power supply. After applying the ac input, the power supply fails to output a volt. If I repeat this process at 1 A on the electronic load the power supply will power up and output 18 V.
I tried this same set up with a similar switching PS and the PS came up regardless of the load applied.
The linear supply i am working with tests good if i apply no load or up to 1.5 A at initial power up. And after it is powered up i can increase the load to full load (7.5 A) and the power supply maintains 18 V dc.
Question 1 - Does a linear supply have a load rating at initial power on?
Question 2 - Does a switching power supply have a load rating at initial power on?
Also, When the linear power supply is driven to over current (about 9 A) the voltage drops out and the electronic load displays about 1.75 A. Once I reduce the electronic load to 1.75 A the output comes back on.
Question 3 - is this value of 1.75 A significant to the load value that the power supply can operate at initial power on?
Question 4 - Is the difference between the over current trip point and the point where the power supply recovers called hysteresis?