Help With Dual Rail Power Supply

Yes, that should work OK.

According to the data sheet the output to frame ground isolation rating is 500V AC, so the outputs are definitely floating by default.

It's a good idea to connect the 0V of the +/- supply to ground at some point, to avoid voltage on it due to capacitive leakage through the supply.

They will also adjust down to 22V according to the data.

Forgive my inexperience, are you referring to "center tap" that would be the ground connection and connecting it to the earth ground?

rjenkinsgb said:

Yes, that should work OK.

According to the data sheet the output to frame ground isolation rating is 500V AC, so the outputs are definitely floating by default.

It's a good idea to connect the 0V of the +/- supply to ground at some point, to avoid voltage on it due to capacitive leakage through the supply.

They will also adjust down to 22V according to the data.

Click to expand...

Not an expert here, but how does one supply know what the other is doing if any load is
grounded to the virtual ground ?



Regards, Dana.

eclorian said:

Forgive my inexperience, are you referring to "center tap" that would be the ground connection and connecting it to the earth ground?

Click to expand...

Yep, that's the idea.

danadak said:

Not an expert here, but how does one supply know what the other is doing if any load is
grounded to the virtual ground ?

Click to expand...

They do not have to, they just each supply one leg (positive or negative) at the set voltage, to the common output "zero", the 0V of the +22V ... 0V ... -22V setup.

Grounding that 0V point helps prevent capacitive noise passthrough, or possible static buildup.

Should be no problem connecting them as you want, but note that those are switching supplies so output high frequency noise could be a concern if your circuits need low noise operation.

crutschow said:

Should be no problem connecting them as you want, but note that those are switching supplies so output high frequency noise could be a concern if your circuits need low noise operation.

Click to expand...

The main concern is a stable voltage source as this will be powering a series of op amps and I need the output voltage to be fairly accurate. The circuit is not practical by any means, but more of an experiment/project so I can complete my 2 year degree.

rjenkinsgb said:

Grounding that 0V point helps prevent capacitive noise passthrough, or possible static buildup.

Click to expand...

I am curious about connecting the virtual ground to earth ground. I have noticed that in many of the forums that talk about this, it is often required that the DC negative terminal not be connected to earth ground if two supplies are to be connected in series. Is this related to the design of such a power supply?

eclorian said:

I am curious about connecting the virtual ground to earth ground. I have noticed that in many of the forums that talk about this, it is often required that the DC negative terminal not be connected to earth ground if two supplies are to be connected in series. Is this related to the design of such a power supply?

Click to expand...

Some PSUs have the negative connected to case / ground; that type either cannot be series connected or you need extra precautions.

The first thing I checked for the PSU type you mentioned was that the output was totally floating; it is.
(The 500V AC to frame ground rating).

As it is floating, you can connect them as you wish and add the 0V ground connection at the appropriate point without any problem.

eclorian said:

I need the output voltage to be fairly accurate.

Click to expand...

Output of what?