Ok I think I got what i want to make lab supply need ideas thou on how to make it good cause this 35 pound transformer needs a home.
What i'm going to do is wire it up for 120 volts that gives me 45 amps at 32 volts or 90 at 16 amps but I'm using the 32 volt center tap as ground 16 + 16-
Or 32 volts +/-
So what I want to end up with is 0 to 32 +/- and 0 to 16 + and 0 to 16-
I'm going to put some big caps so the thing be rock solid on the output

What I need to figure is the best way to get 0 to 32 volt at 30 or so amps and I want 0 to 30 amp output too.
I'll post what i'm starting with. here soon


The X side is the 32 volt side I'm pull out X2 and X3 for ground X4 16+
and X1 16-
Now to make regulator for this thing.

 

If you want regulation down to 0.0 V, then the standard LM317 current boost circuit will not work. On the web there are many "lab supply" or "bench supply" schematics that can be adapted for higher voltage or current outputs. Lotsa options for current limiting, tracking, etc. Have you looked at any of them?

The description of the transformer is a bit confusing. Can you post a sketch of the windings, and a block diagram of the various regulator outputs?

You're talking about hundreds of watts of output power. With all linear regulators you will need some fans. Is switching an option for any of the stages?

ak

 

You can use a bridge rectifier as shown below to get plus and minus outputs from the 16V tap, with double the voltage between the two outputs.
But I don't see how you can get both plus and minus outputs for the high voltage.

 

Assuming that the regulator of your supply can withstand a 3V p-p input ripple voltage, at 45A you will require reservoir capacitors of 125,000uF.

 

This is the winding circuit

It can be used like 5 ways I'm using it for the 32 volt output.
I just getting ideas And yes I done a lot of googling lab power supplys Just figure I'd ask for ideas
I'm going to turn it into a a good supply

 

I wired it up I guess for a $280 transformer it's not bad the voltage is dead on what the name plate said I'm using it as low voltage lighting
Group 2 diagram L

 

I thought about this today I don't think I'm shoot for 20 amp supply
Im going to go for 5 amp +- 16 volt with 0 to 32 from - To +
But I do want full 0 to 16 volts + and - and 0 to 5 amp output.
Looked at LM338 5-Amp Adjustable Regulators

 

Think something like this and add current control. And voltage.
Part's are going to be a little changed bigger cap on the input side.

 

I think this is interesting - the LM338 datasheet has several high-current app circuits, but none of them use a PNP power transistor the way most of National's other 3-terminal regulators do (LM317, etc.). They all use multiple 338's in parallel. Hmmm ...

The 338 datasheet says that power dissipation is internally limited, but it doesn't say what the limit is. Even without this, I recommend against having a single part run at its max rated current.

ak

 

You should isolate the two output grounds. That way, you will have two independent +15V supplies, which gives you more output options.

 

What's racking my brain is how to get 0 to 5 amps. Not seen any good ideas to work with.
I think I'll use 4 Lm338

But wiring up like post 8 and

isolate the two output grounds

I like that idea but that also changes the transformer output to 90 amps lol
This thing is 35 pounds I got it from work wasn't needed we fixed where someone ran 208 but needed 240
I thought about just playing with the transformer it can output 1.5 kV LOL

But I want make a supply nothing better to do on weekends.
Cook eat and sleep and play with my gunk i pickup from work LOL.

 

Are you talking about a regulated 0-5 A output in a constant current mode?

ak

 

I like that idea but that also changes the transformer output to 90 amps lol

Oh, really? How? I'm talking about taking the circuit from #8 and just connecting the bottom winding just like the top. Each winding can have an independent supply.

 

Are you talking about a regulated 0-5 A output in a constant current mode?

ak

I want be able to set the current from 0 to 5 amps

Oh, really? How? I'm talking about taking the circuit from #8 and just connecting the bottom winding just like the top. Each winding can have an independent supply.

I'm not saying your ideal is bad I like that I was kind of thinking the same thing the output of the transformer is just more if you use it
at 16 volts so i just need to make sure i'm careful LOL cause at 16 volts it can dump lots of amps

 

The 338 datasheet says that power dissipation is internally limited, but it doesn't say what the limit is.

It's the internal junction temperature that's limited to somewhere close to its maximum (they also call it thermal regulation), so the maximum power dissipation will, of course, depend upon the heat sink.