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The United States successfully developed new wireless power transmission technology: efficient transmission can be achieved within a range of 1 meter
The development of wireless power transmission technology will lay the foundation for many applications in today's society, such as charging implantable medical devices and wireless charging of stationary electric vehicles. However, it is not easy to create a system that is not affected by changes in operating conditions. For example, it is difficult to be independent of the distance between the power source and the wireless power receiving device; and at the same time, it is difficult to maintain stable power transmission efficiency. There are bigger challenges.
This time, the wireless power transmission system created by Fan Shanhui, a professor of electrical engineering at Stanford University, and his colleagues can achieve efficient power transmission at different distances within 1 meter. The system is made using the principle of parity time symmetry. Parity time symmetry is a concept in quantum mechanics that describes the basic theory of motion of microscopic objects. Generally speaking, symmetry in physics refers to the inherent invariance of a system under specific transformations. Parity time symmetry is space reflection. and invariance under time reversal. The system made by the team using this principle can keep the power transmission efficiency unchanged within a distance change range of about 1 meter.
The research team conducted test experiments using LED lights. The results show that the LED lamp can be powered and can be moved away from the power source until the dividing point of about 1 meter, and the brightness remains unchanged during this process.
In a corresponding news and review article, Geoffroy Roche, a scientist at the French Center for Scientific Research and the Ecole Supérieure des Physiques et Chemiques in Paris, said that this latest discovery is expected to be used to charge mobile devices or vehicles whose transmission distance and direction continue to change.
Nowadays, people are no longer unfamiliar with wireless power transmission, and household devices such as mobile phones and electric toothbrushes seem to be able to implement it casually. However, they are always not ideal in terms of charging efficiency and distance between the power supply and the device. Today's new results provide the possibility to break through the above bottlenecks. In fact, it is not only small appliances and electric vehicles, but also in many places where pulling wires is dangerous, such as mines and oil exploration, or places where it is difficult to set up wires, such as isolated islands and mountaintop base stations. Such an efficient and stable wireless power transmission system is crucial. .
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