Hejsan everybody!

I want to implement some current limiting on my retro power supply before I kickstart my kickstarter campaign, so I came up with this design that sort of works. I'm not sure I'm setting the current limit at the smartest point in the circuit R5, but that's what I've chosen so far. The only concern I have is that for R5 values below ~2k the thing seems to want to oscillate, so I put two caps C1 and C2 in the circuit and that helped on the oscillation, but now the sim runs kind of slow. I would appreciate you comments, thank you all. Again I'm aiming for 0-30V 5A or so as a minimum for the whole contraption.

 

Don't see the point of Q2,U3,U2,...
And how is Q3 working?

 

As above. The circuit does seem overly-complicated. Low-side current-sensing would save on a few components.

 

As above. The circuit does seem overly-complicated. Low-side current-sensing would save on a few components.

Don't see the point of Q2,U3,U2,...
And how is Q3 working?

Agree with Dodgydave. Suggest you consider a LM723 approach.
http://electronics-diy.com/30v-10a-variable-bench-power-supply.php

 

Hello,

Here is a project from late Tone van Roon for a LM723 lab powersupply.
It also give a lot of practical tips for the construction.

Bertus

 

Hello,

Here is a project from late Tone van Roon for a LM723 lab powersupply.
It also give a lot of practical tips for the construction.

Bertus

Yes 723 exactly. Linear supplies from AC DC, Power One, Condor are all using 723.