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The picture shows a prototype of a bipolar coil resonance system developed by the research team that can supply LED TVs at a distance of 5 meters.
People today enjoy a variety of wireless electronic devices. The power supply of these devices is also expected to change from wired to wireless. Recently, a research group at the Korea Advanced Institute of Technology developed a wireless power supply technology and hopes to no longer see this annoying wire in the future.
According to the report of the Physicist Organization Network on April 17, the team of Chun T. Rim, Professor of Nuclear and Quantum Engineering at the school, demonstrated a wireless power supply device called "Bipolar Coil Resonance System (DCRS)" that enables inductive power transmission. The range is greatly expanded and the distance between the transmitting and receiving coils reaches 5 meters.
As early as 2007, the Massachusetts Institute of Technology had used a coupled magnetic resonance system (CMRS) to transmit electric energy through a magnetic field to a distance of 2.1 meters. Since then, long-range radio transmission has attracted many scientists. To extend the transmission distance of wireless power sources such as CMRS to commercial applications, there are many technical limitations, such as a complex coil structure (composed of four coils for input, transmission, reception, and load), a bulky resonant coil, and transmission and reception. The coil's high-frequency (10 MHz) requirements, etc., will make the transmission inefficient, and the resonant coil is very sensitive to the surrounding environment, such as temperature, humidity and human proximity.
To address these issues, Professor Rim provided solutions in their DCRS system. They optimized the coil structure and designed it as a two-pole bipolar coil. The main coil generates an induced magnetic field and the secondary coil receives electrical energy. The CMRS uses large, bulky air-core coils, while the DCRS uses dense-pressure ferrite core coils. The high-frequency alternating current in the main coil generates a magnetic field, and then the coupled magnetic flux generates an induced voltage in the secondary coil.
DCRS is significantly smaller than CMRS. It is only 3 meters long, 10 centimeters wide, and 20 centimeters high. It is also scalable. The system's resistance to environmental changes is also increased by 20 times, and it can operate well at low frequencies of 100 kHz. In many experiments, the results obtained by the research team are promising: For example, when operating at a frequency of 20 kHz, the maximum output power obtained at a distance of 3 meters is 1,403 watts, 471 watts at a distance of 4 meters, and at a distance of 5 meters. 209 watts; while transmitting 100 watts of power, the power efficiency of the entire system is 36.9% at 3 meters, 18.7% at 4 meters, and 9.2% at 5 meters.
"Using DCRS can power a large LED TV 5 meters away and 3 40-watt fans." Rim said, "Our technology proves the feasibility of the long-distance power transmission mechanism, which has never been so far before Although long-range wireless power transmission is still in the early stages of commercialization and the implementation cost is high, we believe this is the right direction for future power supply. Just as Wi-Fi is everywhere, we can have many Wi-power zones in the future. All over the streets of the restaurant, providing people with wireless power service, so that people can use a variety of electronic devices wherever they go without having to carry a bunch of entangled lines, no longer have to worry about charging the battery.â€
In March of this year, Professor Rim’s team also cooperated with Korea Hydro-Nuclear Power Co., Ltd. to complete an experiment to remotely transmit power to the basic equipment and control equipment of a nuclear power plant to deal with emergencies like the Fukushima nuclear power plant in Japan. They successfully transmitted 10 watts of power to a nuclear power plant 7 meters away from the power plant.
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