Can a dual bridge rectifier take 240 split phase & convert it to 120 dc?

[Bossrox]

Rather than using a step down transformer, I got the idea if you had 2 bridge rectifiers, 1 on each phase of 240vac, then combine the 2 dc outputs, would this give me 120 vdc without any complications?

[mab]

No.
 
You'd end up with the full 240dc. The four diodes connected to the two phases would work as a bridge rectifier to give you 240v dc, and the four connected to the centre tap wouldn't do anything.

[JW]

No wait a second,

Look at this-

https://www.ebay.com/itm/175379806172?chn=ps&norover=1

I bought one if these Tig welders and I was supersized when I realized there were no transformers in it.

So yes there are solid-state machines.



JW

[Bossrox]

No.
 
You'd end up with the full 240dc. The four diodes connected to the two phases would work as a bridge rectifier to give you 240v dc, and the four connected to the centre tap wouldn't do anything.

So this is the idea I was thinking of. So this is what you say would give me 240?

[joestue]

So this is the idea I was thinking of. So this is what you say would give me 240?

you'll get 340vdc from 240vac.

170 from 120vac. 1.4:1

[mab]

No.
 
You'd end up with the full 240dc. The four diodes connected to the two phases would work as a bridge rectifier to give you 240v dc, and the four connected to the centre tap wouldn't do anything.

(Attachment Link)
So this is the idea I was thinking of. So this is what you say would give me 240?

Yes, with the caveat that as Joestue said, the unloaded voltage you would actually see on the output capacitor would be the peak voltage 340v.