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Power over Ethernet (PoE) basics and beyond

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257 points voxadam | 2 comments | 16 Oct 25 14:09 UTC | HN request time: 0.859s | source
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willis936 ◴[22 Oct 25 02:40 UTC] No.45664343[source]▶
Other stuff engineers should know:

- PoE endpoints should have isolation barriers, factor this into cost and size estimates

- Don't skimp on TVS

- ideal diode full bridge rectifiers are really cool and you should use them (in more power entries than just PoE)

replies(3): >>45664517 #>>45665543 #>>45666107 #
eqvinox ◴[22 Oct 25 06:31 UTC] No.45665543[source]▶
> ideal diode full bridge rectifiers

For the less electronically inclined, an "ideal diode" surprisingly does not contain plain diodes, it refers to actively controlling MOSFETs to function as diodes.

They're more efficient and quite amazing in PoE applications in particular!

replies(1): >>45679963 #
1. sodaclean ◴[23 Oct 25 09:36 UTC] No.45679963[source]▶
Amazing indeed- since PoE is DC.
replies(1): >>45681406 #
2. eqvinox ◴[23 Oct 25 13:12 UTC] No.45681406[source]▶
Indeed, DC with unknown polarity. The switching frequency of the rectifier is amazingly low ;D