Have you ever heard of a concert that makes the object vibrate slightly when it sings? This is because energy is efficiently transferred between two objects of the same vibration frequency. Physicist Nicholas & middot; Tesla as early as the late 19th century put forward, with the principle of electromagnetic resonance can be achieved on the earth's wireless transmission of electricity. Today, the scientific community is still committed to the wireless transmission technology research. Mobile phones, tablets, laptops ... ... these mobile electronics have changed our way of life. However, they can not do without the charger and the power cord once they are out of power. With the development of wireless charging technology, the trouble of charging the mobile electronic devices may soon be swept away. Not only that, a suitable for high-power electrical equipment, more advanced wireless transmission technology is also gradually into our lives, as it is more and more widely used, power lines and sockets may one day fade out of our field of vision . Wireless mobile phone rapid development Mobile phones are the first to introduce wireless charging technology electronic devices, this technology is no stranger to many people listening. Now a lot of mobile phone wireless charging boards have emerged, and mobile phone manufacturers such as Samsung and Nokia have successively launched mobile phones that support wireless charging. Zhang Bo, vice president of South China University of Technology, said the current wireless charging panels using electromagnetic induction methods for energy transmission. However, the transmission distance is short in this way, and the impression of "wireless" is still not obvious. In addition, the charging distance, the efficiency, and the volume of the charging device also exist in use. "However, I personally think that as people know more about wireless technologies and the level of power transmission, they have made great breakthroughs in the field of mobile phone wireless charging and even optimistic about the prospect of industrialization," Zhang Bo said. Zhu Chunbo, vice president of Harbin Institute of Technology Institute of Electrical Engineering and director of the Institute of Intelligent Testing and Information Processing revealed that the research team at Harbin Institute of Technology is overcoming mobile wireless charging technology over longer distances. Domestic non-end appliances coming soon In fact, wireless charging of mobile phones is only the representative of wireless power transmission technologies applied to many low-power electronic devices. In fact, the application of this technology extends to more powerful electrical devices. For example, Haier's forthcoming wireless-powered tailless television And no tail kitchen. Tailless televisions are able to utilize the "Radiant Magnetic Coupling Resonance" principle for long-distance and efficient wireless power transmission without the aid of electrical wires. This is the first time that wireless power transmission technology has been successfully applied to television receiving terminals. The tailless kitchen electricity is a wireless power transmitter embedded in the no-tails kitchen table, and equipped with wireless power receiver kitchen appliances form a wireless power transmission system, in order to achieve the rice cooker, mixer and other electrical wireless power supply, thorough Solve the difficulty of power cord storage and electric shock and other major problems. It is reported that the tailless mixer and tailless rice cooker will be the first to be listed recently, so that consumers feel the convenience brought about by the progress of science and technology. Electric cars in the future charging while running Compared to mobile phones and tailless TVs, people are more excited about the wireless charging of electric vehicles. "Electric car itself has not been widely spread, its wireless charging more talk about, but this technology is getting closer." Zhu Chunbo told reporters that electric vehicles have a variety of forms of energy supplement, but the contrast Traditional conductive charging, wireless charging has unparalleled advantages in terms of safety and interface standardization, and these advantages may promote the popularity of electric vehicles. Among the news documentary "Who Killed EV1" in the United States, the EV1 is a new type of electric car in California, USA. It is the first to use non-contact charging technology, with inductive charger, to avoid personal injury when charging Danger, very safe. In 2012, for the first time, Stanford University in the United States put forward the concept of "driving charge", envisaging that EVs can run indefinitely without stopping and charging. Imagine if one day people are charging while driving (setting up a wireless charging device on the road), stopping in the garage and pressing the button. By then, this combination of dynamic and static electric vehicles will be very popular. In fact, in the field of special applications, wireless transmission technology has come to the fore. Wireless power transmission technologies are playing an important role in contactless power access, biomedical devices, rotating equipment, wireless sensors and other devices for underwater (subsea) mobile equipment. Therefore, we have reason to expect that one day it will be applied on a large scale to electric vehicles. Wireless transmission still need technical breakthroughs Although the development and application of wireless power transmission technology based on the electromagnetic induction coupling mode is popularized rapidly at home and abroad, it still needs further breakthrough in terms of power capacity, transmission efficiency, transmission distance and electromagnetic compatibility. Party Secretary of Chongqing University School of Automation, Power Electronics Sun Yue, director of Control Engineering Institute, pointed out. But he is still full of confidence. "It can be predicted that in 10 to 15 years, the wireless transmission technology will surely get a large-scale popularization and application." Zhang Bo believes that the current electromagnetic induction, magnetic resonance and other magnetic field transmission technology is relatively mature, but limited to the surrounding environment and other factors, transmission efficiency and power are unable to meet people's daily needs, which may mean that people have yet to explore the magnetic field transmission The "ultimate theory." "Nature has its own laws, the magnetic field transmission of energy must have its own path, but we have not found this law, which requires our academics to make great efforts to explore." Zhang Bo said that this may require information, control, electronic power, Materials and even mathematics and physics and other disciplines cross-cutting research, once the magnetic field to explore the power transmission method, its significance no less than the invention of optical fiber.