Paralleling Power Supply Units Made Easy ???

jrnymn7 wrote:

ken white wrote:

jrnymn7 wrote:
??? could any small variations in voltage output of either unit cause the other to drop out prematurely?

And do I simply set both units to 20a c.c., and let their voltage rise as needed to supply the 20 amps each?

thanks.

Yes and Yes.

Constant current paralleled is fairly easy for load sharing and straight forward.

Constant voltage is not, since the feedback loops may cause instability (oscillations) in the output voltage between the two supplies and load - even when Schottky diodes are used in series between the supply and load...

Just to be clear then, you are dis-agreeing with Salvo's approach? The voltages are not set the same, but the units will still operate in c.c. once the amps are set the same ?

thanks.

You can use the current limit capability of a variable voltage power supply that way, but it will still struggle to load share when the voltages get close to each other.

I was actually talking about using a variable constant current supply instead, which is what I thought was being discussed when talking about cc supplies...