2 ms·

This seems a bit low, do you have a source? While I haven't worked with the Qi standard directly, I've used 200 kHz inductive power transfer in other contexts,

by addaon 5y ago

This seems a bit low, do you have a source? While I haven't worked with the Qi standard directly, I've used 200 kHz inductive power transfer in other contexts, and efficiency numbers in my experience are in the 75% - 85% range for well-aligned coils. The total efficiency will be a bit less than this (moving charge in and out of a battery is pretty good, but not 100%), but I'd be surprised to see 5W transfer with a total efficiency much less than 70%.

arcticbull 5y ago
This article is a bit sensationalist, but they claim to have gotten mid-60s efficiency [1]. I think I misread them initially when they said "47% more power" - I took that to mean 47% efficiency, but on re-reading it's closer to 66%. My bad! [1] https://debugger.medium.com/wireless-charging-is-a-disaster-waiting-to-happen-48afdde70ed9 https://debugger.medium.com/wireless-charging-is-a-disaster-...