Center Tapped Transformer vs Dual Secondary Transformer for Split Supply

[bitshift]

Hey guys,

I would like to build a small linear bench power supply with one positive channel and one negative channel referenced to a common ground. With a center tapped transformer, the center tap becomes the common ground. From what I understand, you can use a transformer with dual secondaries and connect the + side of one of the secondaries to the - side of the other secondary and use that to create the common ground for the split supply.

Is there any downside or potential traps for young players using a dual secondary transformer in such an application?

[Zero999]

It makes no difference whether a centre tapped or dual secondary transformer is used.

The only problem with a dual secondary transformer is getting the phasing wrong but that just means it won't work. Reversing the connections to one secondary would solver the problem.

[bitshift]

Thanks for the reply  Just wanted to be 100% sure before fiddling with the mains.

Just to be clear by phasing you mean that if you choose to connect the wrong secondary wires together the AC will destructively interfere and you would get 0V?

[Zero999]

Thanks for the reply  Just wanted to be 100% sure before fiddling with the mains.

Just to be clear by phasing you mean that if you choose to connect the wrong secondary wires together the AC will destructively interfere and you would get 0V?

Yes, connecting the wrong secondary wires together would result in 0V.

[bitshift]

Awesome, thank you 

[IconicPCB]

Split windings give you the option of setting up independent supplies which do not necessarily have to be connected at some notional "centretap" position. They could be used as two independent supplies powering say two circuits.

[Gyro]

With dual secondary you also have the option of switching them to give you a supply that can either provide a full output voltage or half the output voltage at twice the current. As previously mentioned, the ability to provide two independent floating supplies is also very useful.

[dom0]

Take a look at the HP 6236B or HP E3630A

[Brumby]

Split windings give you the option of setting up independent supplies which do not necessarily have to be connected at some notional "centretap" position. They could be used as two independent supplies powering say two circuits.

A big +1 for this.