Raspberry Pi redesigns Power over Ethernet for the Pi 5
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Raspberry Pi is designing an add on board to tackle the space challenge of providing Power over Ethernet (PoE) for its latest 5 board.
It is working on an integrated power design for a PoE HAT+ to provide power to the Raspberry Pi 5 board from the Ethernet network via a flat, planar transformer to allow the HAT to fit into existing cases.
“Way back in 2018 we launched Raspberry Pi 3B+, the first with Power-over-Ethernet (PoE) support. We’ve been shipping PoE-powered devices, with the occasional hiccup, ever since,” said Eben Upton, CEO of Raspberry Pi.
The company has now launched a standalone PoE+ Injector, developed with Microchip Technology, to add 30W PoE support with power delivery (PD) to an existing network without the need for a power line. This simplifies the installation of a range of applications in out of the way locations, from garden webcams to industrial controllers.
The injector supports both the IEEE 802.3af (PoE, 13W) and IEEE 802.11at (PoE+, 25W) standards, and mains voltages between 100V and 240V.
However there are challenges for providing PoE for the latest Pi 5 board with its disaggregated architecture.
“While Raspberry Pi 5 provides a 4-pin PoE power connector, our first-party PD accessory, the snappily-named Raspberry Pi PoE+ HAT+ for Raspberry Pi 5, is missing in action. This promises to be our smallest, most efficient PD accessory, and is in the final stages of development,” said Upton.
“The principal cause of delay is that for the first time it features a planar transformer on our own PCB. So the ferrite is clamped around the PCB, rather than a separate wound object like the PoE HAT or a transformer from a third party,” he said. “The end product is incredibly Spartan-looking, with very few components, and fits inside the official case, with most of the clever stuff sitting in the space between the fan and the USB and Ethernet connectors.”
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