Korean Advanced Institute of Science and Technology (KAIST) researchers have broken a record by transmitting enough power wirelessly over a distance of about 16 feet to simultaneously charge up to 40 smartphones.
The researchers created a Dipole Coil Resonant System made specifically for an extended range of inductive power transfer between transmitter and receiver coils. The system involves a 10-foot-long, pole-like transmitter and receiver that was able to create a magnetic field large enough to transmit 209 watts of power over a distance of five meters, a distance at which the wireless transmitter still emitted enough power to charge up to 40 smartphones, if plugged into an outlet powered by the wireless transmitter.
After conducting several experiments, the researchers found that at 20 kHz, the maximum output power was 1,403 watts at a three-meter distance, 471 watts at four meters, and 209 watts at five meters.
"A large [light-emitting diode] TV as well as three 40 [-watt] fans can be powered from a five-meter distance," says KAIST professor Chun Rim. The researchers say wireless charging could eventually be as common as Wi-Fi technology.
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