What hardware is required for putting two 4113 channels in parallel?

[cpyc]

I am looking to parallel the two channels of the PXIe-4113 to get more current capability. According the "NI PXIe-4113 Combining Multiple Outputs" found here: 

NI does not recommend operating multiple channels of the NI PXIe-4113 in parallel to generate larger currents without using additional external circuitry. The output topology of the NI PXIe-4113 can sink current, which leads to static current flow between channels as a result of small offsets in the voltage output levels of each channel. Contact NI technical support at ni.com/support for more information about restrictions for operating channels in parallel on the NI PXIe-4113.

I am thinking this is probably a couple of diodes, but I was looking for more specific recommendations as alluded to by the above statement. What are your recommendations?

Thanks.

[Bumblebee_Tuna]

Hello,

You are right about using diodes as the external circuitry. Make sure the diode can handle at least 6 A. Also, keep in mind there will be an additional voltage drop due to the diodes. 

-Jayk

[mbyosh]

Are the 4113 modules current mode controlled or voltage mode?   Can you put the voltage sense controls after the cathode of the diodes to regulate the load output?

thks

[DAQsHilarious]

Hello, 

You can configure the 4113 to be either voltage or current controlled. Generally, connecting modules in parallel to increase the output current capability works best when operating the devices in DC Current mode. As for connecting the diodes, you can reference the following white paper, even though the paper specifies a different module. The procedure is the same. 

https://www.ni.com/en/support/documentation/supplemental/12/cascading-the-outputs-of-the-ni-pxi-4130...

https://knowledge.ni.com/KnowledgeArticleDetails?id=kA03q000000x22lCAA&l=en-US

I hope you find this helpful.