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Good question. The W520 wants 20V (at up to 170W). Looks like the newish USB PD standard can supply 20V in addition to 5V. So maybe it could be done with a current/forthcoming consumer USB PD wallwart, without needing to add additional power circuitry?

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> So maybe it could be done with a current/forthcoming consumer USB PD wallwart, without needing to add additional power circuitry?

You may need a circuit to negotiate the USB-PD, then to ouput 20V from that, but it should be possible.

It could even be a very interesting project: expose an artificial resistance on the barrel plug to simulate the Lenovo AC wattage resistor by matching what the USB-PD can deliver.

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