Having collected some PSUs with CC capability I’d like to know how quick they are responding to an overcurrent condition.
Test setting is like this:
PSU is configured to deliver 25V/1A.
PSU is connected to a 10 Ohms resistor.
This load circuit is switched on/off by a MOSFET-Module, controlled by a function generator.
off: No load, PSU idles at 25V/0A
on: PSU would deliver I=U/R=2,5A but limits current to 1A by lowering the voltage to 10V. The question was: How quick does this happen?
Here are the results:
Agilent 6653A see picture above.
C1/yellow: Mosfet control
C2/magenta: Voltage over R
C3/cyan: PSU voltage
With the load switched on, the Agilent needs about
20ms to adjust to 1A current.
Siglent 3303X(-E)The Siglent is slower with about
30ms.
Going down from 25 to 10V it switches the transformator outlet by relay.
HP6114AFor the HP6114A the test runs with it’s voltage limit of 20V.
It needs about
30ms to adjust to 1A too.
Interesting to see, that it needs about 300ms to recover back to 20V when idle.
Voltcraft PS 303 proSurprisingly, the low cost Voltcraft is the fastest one: It needs
5ms to adjust to 1A, even with a transformator relay switching, which can been seen in the 2nd shot.
To be continued with the next post about the TDK Lambda Geness 50-30 ...