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I'm asking the same questions. There's no giving up on USB because there are no alternatives. Wireless charging is terrible and inefficient.
by gtirloni 4y ago
I'm asking the same questions. There's no giving up on USB because there are no alternatives. Wireless charging is terrible and inefficient.
- Retric 4y agoWireless charging cellphones uses so little power that their ~70% efficiency is practically irrelevant. A single USB wall charger that wastes 0.5W when not in use consumes about 4x as much energy as is wasted by using wireless charging your cellphone. As to recharge speeds, it’s easily comparable with USB. Sometimes USB charging is noticeably faster, but use the wrong charger and USB will be far slower.
- scarface74 4y agoWireless charging can not even approach the speeds of wired charges and your energy estimates are off. https://debugger.medium.com/wireless-charging-is-a-disaster-waiting-to-happen-48afdde70ed9 https://debugger.medium.com/wireless-charging-is-a-disaster-...
- Retric 4y ago70% efficiency requires 43% more power, your article says “47% more power than a cable” at the top which is a little worse but wait “In general, the propped-up design helped align the coils without much fiddling, but it still used an average of 19.8 Wh, or 39% more power, to charge the phone than cables.” that’s better than 70% efficiency. So ~70% efficiency is spot on. Wireless charging can do 15+W depending on the phone. As to the scare quote about 3.5 Billion phones, the charger they mentioned consumes 0.25W when the phone isn’t attached or 6Wh per day that’s the same energy it wastes charging a battery 12Wh per day. You can find many wired wall chargers that waste more than 0.5W when the phone isn’t charging so using one would actually take more energy than using that wireless charger for a single phone.