3 ms·
> PoDL does have real advantages over PoE. I'm curious, what advantages are you thinking of? PoE++ can deliver more power than PoDL, last I checked. I guess t
by coder543 3y ago
> PoDL does have real advantages over PoE.
I'm curious, what advantages are you thinking of? PoE++ can deliver more power than PoDL, last I checked.
I guess the option for lower voltage could be nice in some very specific applications? I think the minimum for PoDL in the spec is 12V, which would still require conversion for pretty much any use case.
- addaon 3y agoPoDL and PoE are both limited to SELV (< 60 V) for safety reasons, so no win there. On paper, PoE can handle more current; but PoE current is limited by center-tapped transformers, which tend to overheat if you push too far. Just due to the ease of getting a wider range of inductors, it's pretty easy to build PoDL systems that go up to wire current capabilities; and SPE runs better than you'd expect for tens of meters over some ridiculous high-gauge wire, since it really is tolerant of out-of-spec wiring. 5A - 10 A (300 W - 600 W) over a, let's say, "PoDL-inspired" system is quite achievable.
- coder543 3y agoAs far as I know, the PoDL spec tops out at around 50W, but you could be right that a “PoDL-inspired” system (which I found amusing) could potentially go much higher than that.
- addaon 3y agoYeah. Basically PoE forces a common coupling (center-tapped transformer) for both power and data, which really limits not just part availability but also the design space. While the PoDL inductive power coupling and capacitive data coupling interact (and pin capacitance of the inductor can be an issue with really big inductors), they're near-independence really, really opens the design space up.