DC-DC SSR Wiring Question

[Kart31]

Obviously in wiring DC-AC SSRs there is no such things as a common ground (DC on the control side, AC of the load side). DC-DC SSR could have a common ground. But do they need to have a common ground?

 

[MaxHeadRoom78]

It all depends on the application, but by Ground I assume you mean power commons rather than Earth GND.
The terminology is confusing as Ground is used for both, unfortunately.
Max.

 

[Kart31]

Yes, common DC power return. Can you elaborate on the application dependency? Which applications would require the power returns to be the same?

 

[MaxHeadRoom78]

One current use of using the same common I am presently using is where a 5v microprocessor is interfacing with a 16vdc system and the micro is using the same supply via a 5v regulator.
A Opto is used to interface the 5v micro with the higher voltage system.
Max.

 

[crutschow]

Normally SSR's, either AC or DC out, have the input isolated from the output, so do not require a common ground (common).