Can television signals charge mobile phone batteries wirelessly?

Drsunil V February 10, 2014
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Can television signals charge mobile phone batteries wirelessly?

What is future of mobile battery charging wirelessly?

  1. Guy M
    February 12, 2014 at 2:07 pm

    Oron is right. There is no feasible or useful way to use stray radio waves to charge a phone.

    However, it is possible. With time and research, you can build a device that converts radio waves to electrical energy that can be used to charge batteries. But, it would take an extremely long time to charge a battery of that size. Probably weeks, if not months. We're talking about microvolts and picoamps. Just not useful for anything larger than the smallest RFID tags.

    In the future, we might see technology like this develop a greater ability, and we might see energy usage of larger devices drop significantly. When the two sides meet, we might see the ability to charge some devices with ambient radio waves. Don't hold your breath until then, though.

  2. Oron J
    February 10, 2014 at 3:14 pm

    No. So called wireless charging can realistically only be done by induction, which uses magnetic coils, which work best at much lower frequencies (e.g. 50-60 Hz, like mains wiring). In principle, it is not difficult to build a cordless charger, and there are many devices such as electric toothbrushes that do so. The main challenges are keeping the size and weight down (since there needs to be a coil and regulator in the phone or battery) and standardisation. The latter is the real problem. In 2013, we still do not have a single charging specification (power and socket) for wired phone chargers. Settling down on a standard for a new technology (OK, not new, but new to the phone market) is going to be even harder, but it will happen!