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How To Eliminate The Reverse Current Of Regenerative Load With RMX 4125

Updated Apr 11, 2024

Reported In

Hardware

  • RMX-4125

Issue Details

I have a test item that needs to measure the load voltage and current. During the measurement process, one step will power off the load and give the 4125 positive and negative terminals a reversal current of about 0.5A.
The reverse current would impact the readings of the circuit loop, how to eliminate the impact?

Solution

RMX programmable power supplies cannot sink reverse current from the load. Therefore, if a regenerative load (such as an inverter, converter, or transformer) is connected and tries to sink power into the power supply terminals, the output voltage will increase and become unstable. This can cause a malfunction.
Connect a resistor (RD) as shown in the following figure to bypass the reverse current for these types of loads. However, the amount of current to the load decreases by Irp.
image.png
Please be careful to use a resistor with sufficient rated power for RD. If a resistor with insufficient rated power for the circuit is used, the resistor will burn out.

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