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Wired roads: could power electric cars as you drive.

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Wired roads: could power electric cars as you drive.A new wireless power system could help people avoid the inevitable mixed mess of tangled cables and offer a more efficient way to charge electric vehicles along the way, according to a new study. Researchers at Stanford University adapted a concept of quantum physics to produce a wireless charger that does something other wireless chargers can not: automatically tune the frequency of the radio wave the medium that transfers power to account for changes in the Distance between the loading platform and the device. In one experiment, the team demonstrated that their system transferred power with 100 percent efficiency up to approximately 27 inches 70 centimeters.The range is perfect for electric cars, Sid Assawaworrarit, a doctoral student in electrical engineering at Stanford University. The floor of a car is about 20 inches 8 inches away from the road surface. The loading platform could be integrated below the road surface.Although other wireless charging devices, such as telephones, already exist, efficiency drops dramatically if the device is too close or too far from the charger. This means that a phone has to be placed on top of a loading platform to work better, and an electric car needs to be parked directly on a pad to recharge efficiently. As such, electronic devices are still tied, albeit invisibly, to their power source, according to Assawaworrarit.The problem lies in the design of these wireless power systems. They usually consist of a source, which is the charging platform, and a receiver, which could be a telephone or an electric car. At the source, radio waves of a certain frequency are generated to excite electrons in a wire coil, called a resonant inductor. The receiver in the telephone or electric vehicle also has a resonant inductor from a coil of cables. When the two inductors are placed close to one another, the energy is coupled from the source to the receiver. At the receiver, a component called a rectifier converts the energy from radio waves to usable electrical power for the phone or car.#Electriccars #engineering #chargingplatform #wirelesscharge #device #electronicdevices #Assawaworrarit #radiowaves #receiver #ymasciencia

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