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Wireless Charging Breakthrough for Recharging Moving Electric Cars

If electric cars could recharge while driving, concerns about their range would be virtually eliminated - a big step towards making electricity the standard fuel for vehicles. Stanford University scientists have now overcome a major hurdle to such a future by wirelessly transmitting electricity to a nearby moving object. "In addition to advancing the wireless charging of vehicles and personal devices like cellphones, our new technology may untether robotics in manufacturing, which also are on the move," says electrical engineer Shanhui Fan. In their work, the team used magnetic resonance coupling to transmit electricity wirelessly to a moving LED lightbulb. That demonstration only involved a 1-milliwatt charge, whereas electric cars often require tens of kilowatts to operate. The team is now working on greatly increasing the amount of electricity that can be transferred, and tweaking the system to extend the transfer distance and improve efficiency.

Topics:
Automotive Batteries Energy Energy Efficiency LEDs Lighting Power RF & Microwave Electronics Transportation

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    Transcript

    00:00:03 [Music] what we have done here is a way to do robust uh Wireless power transfer and this is going to be important for dynamic charging in trying to transfer power wirelessly uh into a moving object The Source coil here is going to generate a magnetic field that couples basically to the receiving coil and the receiver coil actually has a light

    00:00:28 emitting diode attached to it the light emitting dial is going to stay on over a range of distance as the distance is varying and as you see here this is perhaps the most important outcome of this um experiment that we have constant and wireless power transfer and high efficiency transfer across a wide range of distance this is in contrast to a

    00:00:56 previous wirus power transfer scheme where you only get brightness at a certain distance so for example um it would be bright over here and not pretty much dim outside this range this is not trying to do long distance power transfer uh as you can see here we're talking about uh maybe a meter scale kind of transfer uh you can think about for example transferring into a moving

    00:01:22 vehicle or into any other moving object that one can think of another simple example is you have a device on your body that need to to be charged for example if you want to charge your cell phone as you are walking around in a room being able to do this in a robust fashion as we do here could potentially be quite [Music]

    00:01:50 interesting