4 ms·
Interestingly, many universal power supplies (as in, works in the US and in Europe without doing anything to the PSU) are naturally capable of digesting 200~300
by namibj 2y ago
Interestingly, many universal power supplies (as in, works in the US and in Europe without doing anything to the PSU) are naturally capable of digesting 200~300V unregulated DC.
Beware though that DC arcs above 500mA will not easily extinguish, so devices should not be plugged under load (and if it can't be helped, a rapid yoink keeps the arc from burning the contacts).
Circuit breakers have to be used with 2 poles in series and mechanically linked to switch together. Check the datasheet for details. Mains fuses with a suitable DC rating on their datasheet are readily available, though.
- user_7832 2y agoI believe that's because many power supplies' first step is to rectify the DC into AC, so if you feed in DC directly it "just works".
- namibj 2y agoWell, yeah, but this actually goes beyond those that first rectify. E.g. bridge less totem-pole designs where rectifying and the active power factor correction stage are fused, would also work unless the firmware gets confused by the lack of input polarity flipping. And yes, that topology can also go into a flyback transformer or pretty much any other unipolar magnetic of an SMPS.