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Wireless power transmission is possible
Details.
Created 19.04.2014 09:21
Electronics have undergone enormous changes in recent decades. Modern gadgets are actively getting rid of wires. Wireless phones, tablets and even chargers are no surprise today.
However, there is no limit to perfection. The latest blow to wired technologies is being dealt by researchers working on the problem of wireless power transmission. Recently, Chun T. Rim, professor of quantum and nuclear engineering, and his colleagues at the Korea Advanced Institute of Science and Technology (KAIST) demonstrated a device that is capable of transmitting energy without wires to a distance of 5 meters.
In 2007, researchers at MIT developed the Coupled Magnetic Resonance System (CMRS). They managed without wires, using a magnetic field to transmit energy at a distance of 2.1 meters. The success attracted the attention of scientists from all over the world and stimulated the further development of wireless energy transmission technology.
The technology developed by the Americans, unfortunately, has a number of limitations that prevent its commercialization. The resonance coils required for transmission are complex and too bulky. Energy transfer is possible at high frequency (about 10 MHz) and at high quality (2000) circuit, which in practice means a strong sensitivity to temperature, humidity and the presence of people.
Unlike large loop-like coils CMRS, the system developed by the Koreans is compact due to the use of ferrite cores. At first glance, the Dipole Coil Resonant System (DCRS) is nothing new. Any radio amateur is familiar with the principle of transmission: as in a conventional transformer, the high-frequency alternating current of the primary winding creates a magnetic field, which then induces a voltage on the secondary winding.
However, the differences between DCRS and CMRS are visible to the naked eye, the systems differ significantly in size. Length of a thin coil of Korean scientists 3 meters, height 20 cm and width 10 cm. The operating frequency is reduced by 100 times to 100 KHz, the quality of the circuit is only 100, which significantly reduces sensitivity to external influences.
The KAIST scientific team conducted a series of experiments, during which energy with a capacity of 1403 W was transferred to a distance of 3 meters. At 4 meters, it was possible to transfer power to 471 W, and 209 W to 5 meters. The efficiency of the 100-watt consumer power system was 36.9% at 3 meters, 18.7% at 4 meters and 9.2% at a distance of 5 meters. This means that in practice, a large LCD TV, along with three 40-watt fans, can be removed from the outlet by 5 meters and receive energy without a wired connection to the power grid.
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Created 19.04.2014 09:21
Electronics have undergone enormous changes in recent decades. Modern gadgets are actively getting rid of wires. Wireless phones, tablets and even chargers are no surprise today.
However, there is no limit to perfection. The latest blow to wired technologies is being dealt by researchers working on the problem of wireless power transmission. Recently, Chun T. Rim, professor of quantum and nuclear engineering, and his colleagues at the Korea Advanced Institute of Science and Technology (KAIST) demonstrated a device that is capable of transmitting energy without wires to a distance of 5 meters.
In 2007, researchers at MIT developed the Coupled Magnetic Resonance System (CMRS). They managed without wires, using a magnetic field to transmit energy at a distance of 2.1 meters. The success attracted the attention of scientists from all over the world and stimulated the further development of wireless energy transmission technology.
The technology developed by the Americans, unfortunately, has a number of limitations that prevent its commercialization. The resonance coils required for transmission are complex and too bulky. Energy transfer is possible at high frequency (about 10 MHz) and at high quality (2000) circuit, which in practice means a strong sensitivity to temperature, humidity and the presence of people.
Unlike large loop-like coils CMRS, the system developed by the Koreans is compact due to the use of ferrite cores. At first glance, the Dipole Coil Resonant System (DCRS) is nothing new. Any radio amateur is familiar with the principle of transmission: as in a conventional transformer, the high-frequency alternating current of the primary winding creates a magnetic field, which then induces a voltage on the secondary winding.
However, the differences between DCRS and CMRS are visible to the naked eye, the systems differ significantly in size. Length of a thin coil of Korean scientists 3 meters, height 20 cm and width 10 cm. The operating frequency is reduced by 100 times to 100 KHz, the quality of the circuit is only 100, which significantly reduces sensitivity to external influences.
The KAIST scientific team conducted a series of experiments, during which energy with a capacity of 1403 W was transferred to a distance of 3 meters. At 4 meters, it was possible to transfer power to 471 W, and 209 W to 5 meters. The efficiency of the 100-watt consumer power system was 36.9% at 3 meters, 18.7% at 4 meters and 9.2% at a distance of 5 meters. This means that in practice, a large LCD TV, along with three 40-watt fans, can be removed from the outlet by 5 meters and receive energy without a wired connection to the power grid.
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Comments:
Download SocComments v1.3
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