Switching power supplies and overcurrent protection

Depends on your application. If those spikes are "normal" in your scenario and not an indicator of doomsday being around the corner then constant current may be your ticket. I use it a lot, for example in gear that can occasionally arc and where that is considered ok. But there is usually some sensing included that puts a lid on it when the frequency of spikes gets to be too much.

If stuff could be overstressed consider slight foldback.

IME - only linear PSU have instantaneous acting current limiting.

..... Phil

App is low power DC servo CNC. Unregulated DC supplies are the norm here but nowadays a SPS can be cheaper than the AC transformer al>

Well, fast is a relative term, so let me put it this way....I've found Meanwell shutdown and hiccup SPS types to be unsuitable for my needs.

"Phil Allison"

:Well, fast is a relative term,

You need to learn basic electronics terminology.

: so let me put it this way...

Shame the pre-requisite for that is clear thinking.

: I've found Meanwell shutdown and hiccup SPS types : to be unsuitable for my needs.

You already know what kind of PSU works .

..... Phil

I think it suffices to say that the mean spirited and the wretched from down under are best avoided.

Yet another incoherent diatribe reflecting your miserable sex life.

Then you need one with clean current limiting or hang a large capacitor onto it. But there is often a maximum allowed capacitance so I'd ask the manufacturer.

Brushes in DC motors might short intermittently, and the ripple current (1) doesn't drive the motor (isn't required), and (2) might overstress a capacitor. A series choke is an easier solution than big capacitor, in this case.

He just needs a choke and load R ..

common problem.

Thanks! I'll get one of the CC limiting types and see how that fares.

I'll admit I only read this thread cause Phil made replies.. :P

But make sure to push the choke back in after 1-2 miles :-)

Been there, done that. Since I built only one unit, I finally opted for the unregulated standard supply in favor of trying to finding a suitable SMPS. My app involved moving heavy gear with infrequent hard accelerations but generally slow motion and low forces. So I dimensioned pretty wimpy and went into up to 5x overload during acceleration (Shouldn't have used toroids though).

In a given application you might get away with a SMPS rated for --say--

robert