2 SMPS on one amp

[globalplayer]

Can I wire 2 SMPS 60V to an amp requiring -60/+60V without problems?

Connect one from GND to GND and +60 to +60, the other connect +60 to GND and GND to -60 of the amp?

 

[scottjoplin]

You can connect two power supplies in series. It's important though that there is no connection between the supplies 0V and earth as this will create a short circuit

 

[globalplayer]

So I can use the "middle point" where GND and +60V of the psus are connected as amp GND?

 

[scottjoplin]

Yes, check gnd of power supplies are not connected to mains earth

 

[globalplayer]

Ok.
Thank you.

 

[MorbidFractal]

For clarity, or lack thereof, you can connect two power supplies as described as long as the inputs are [transformer] isolated from the outputs, i.e. Offline converters.

They can share the same mains input, live and neutral along with chassis/mains ground if it is present. If it is not then they should be double insulated.

They may also include Class Y capacitors primary to secondary and primary/secondary to chassis/mains ground for filtering/noise purposes.

 

[globalplayer]

Alright.
Thanks.

 

[Kay Pirinha]

You can even chain two SMPS's within one DC rail. I did this sucessfully by chaining four cheap (EUR 3.95 at the moment, I've paid somewhat more...) 24V@2.5A SMPS modules to get ±48V rails feeding a power module of an old Klein & Hummel amplifier from the 1970ies.


Best regards!

 

[globalplayer]

Good idea.
Thanks.

I might go for 4 36v psus to supply +72v and -72v.

 

[Kay Pirinha]

Oh, just saw these 24V@2,5A SMPS's are just EUR 2.95 now...

Best regards!