The end of the Socket Era?

The end of the Socket Era?

Core tip: have you ever freaked out about the mass of sockets and wires in your home ? Now, good news! Japanese scientists have recently released the latest achievements in microwave wireless transmission technology. Chinese scientists have been broken through technologies of wireless transmission in the bus, high-speed rail, television and other fields in recent years. It is possible to say goodbye to the socket.

A new record

Microwave electricity transmission lights led-lamps 500 Meters away.

Speaking of E-transmission, you may think of thick pole and long high tension line, or massive socket and power lines in your home.Now our communication technologies, such as telephone and network, have already realized to wireless  from wired.Why is wireless E-transmission lagging? Can electricity be transferred from the generator to the receiver without a wire? Scientists have been researching and achieving more. The success of two successive experiments in Japan in March attracted the public.

On March 11, Japan aerospace exploration agency (jaxa) announced that researchers accurately transmitted 1.8 kw power to a receiving device 55  meters away with microwave. The next day, Japan’s Mitsubishi heavy industries also announced that their researchers converted 10 kw power into microwave and parts of the electricity successfully lit a LED-lamp on a receiver 500 meters away. It has been a maximum power and the longest distance transmission in Japan so far.

Mitsubishi said the technology would be used in space solar power generation systems (SSPS). The company plans to transmit power from space generators to the ground through microwaves from 2030 to 2040. It is estimated that if a large solar panel of a diameter of two to three kilometers used to generate electricity in space, it will be a nuclear power unit with a capacity of one million kilowatts. The idea of solar power in space did not come from Japan. American researchers came up with the idea in the 1960s.

In 2007, a group of scientists in MIT lit a 60-watt bulb more than two meters away from the ground through radio transmission with electromagnetic resonance technology. However, there are still many difficulties to overcome in realizing this vision, such as how to send huge power generation devices into space and how to assemble and maintain them. The most difficult is how to solve the problem of dispersion and attenuation of radio waves. Two successful experiments in Japan which wireless transmission of electricity, one only enough to start a electric kettle, another a 10- kilowatt power only lit up a small power LED lamp after the 500 – meter transmission . ” It means that most of the energy is released during transmission.”Said Liao Chenglin, a researcher in the Institute of Electrical Research of Chinese Academy of Science.

In addition to improving transmission efficiency, scientists are also faced with problems such as how to reduce the interference of microwave transmission paths on environmental equipment and influences on biology . In addition, because of the long distance, the microwave transmission path needs to be reduced while the power output of the power station must be very large, “possibly reaching the megawatt level”. said by Yu kai, a researcher in  Shanghai institute of Microsystems and Information Technology under the Chinese Academy of Sciences.

Focus on practicability

There have been many breakthroughs in the areas of television car, high-speed rail in China. When the bulb was lit up at the Massachusetts Institute in 2007, Chinese scientists have also noticed the prospects of wireless transmission technology. And compared with microwave technology aimed at a long-distance transmission, we focus more on close wireless transmission research which has better commercial prospects because it can bring convenience to users directly. So its commercialization potential is much larger. In fact, these technologies have been already being used in dayly life, such as recharging cars with new energy.

In  early 2010, Haier Group launched the world’s first “tailless TV” on International Consumer Electronics Show– the power line, signal line, network line and other “tail” behind the TV have been cut off. This is the first successful application of wireless power transmission technology in television reception terminals. Nowadays, this technology has been extensively tested in mobile phones, mobile power, refrigerators, kitchen appliances and other domestic products in China.

Last year, ZTE New Energy Automobile built China’s first demonstration line of wireless charging buses in Xiangyang, Hubei Province, and the world’s first  community bus with wireless charging was launched in Chengdu. According to the actual data of Chengdu bus, the capacity can meet the need of a new energy bus finish a eight-kilometer route after charged within 8 minutes, and the overall charging efficiency reaches 90%.

Yang Qingxin has eyes only for wireless power supplying for high-speed rail. He is a man at the wheel in the research team of Engineering Electromagnetic Field and the Magnetic Technology of Tianjin Industrial University. The technology of high-speed train radio transmission developed by them was ranked as one of the ten leading science and technology in the future by China Association for Science and Technology last year.Transmitting terminal is fixed above the railway with suspended coil technology. Receiving end is placed on the top of the train  replacing the traditional way that electric locomotive obtains power energy from the pantograph through the moving contact.  There allowed tens of centimeters gap between transmitting terminal and receiving end, which not only greatly improves the quality of the dielectric strength and current collection, but also fundamentally solved problems of off -position because of abrasion and ice. It is considered to a innovation power supply model for high-speed train.

Is beset with difficulties, human can make “a big step” for using clean energy efficiently in the future by such “small steps” one after another, such as electricity and solar power.

Imagine that a solar-powered satellite standing at an altitude of 35,000 kilometers above the ground, providing a steady stream of power to cities on the ground! This mode of transmission is clean and safe, and will not be affected by bad weather and time, nor will there be nuclear leakage accidents as traditional nuclear power plants. Such a bright prospect drives countries to increase their investment in wireless transmission.

Another reason is the rising cost and pollution of wired power, which has led to more and more wars and public crises over energy in recent years. “If the idea of a space solar power station comes true, it will solve the global energy crisis.” The technology has also been extended to many other applications, such as powering satellites and orbiting vehicles, or powering interstellar spacecraft.

Wireless transmission technology can also provide another efficient way of transmission where it is inconvenient to set up transmission lines.It is not only difficult and dangerous to build power transmission lines in high mountains, forests, islands and deserts, but also difficult to repair and repair the power lines in the future.Border posts, radio navigation stations, satellite monitoring stations and astronomical observation stations in these areas require electricity for living and working. It is much more convenient to transmit electricity wirelessly.

Humans have been trying this out for more than 100 years.

In fact, as early as the first half of the 19th century, we had the idea of transmitting electricity wirelessly. It can be traced back to the American mad scientist Nicola Tesla.

The electromagnet has appeared for not a long time, and electromagnetic induction phenomenon also has just been found at that time. Tesla designed a simple wireless transmission device: a coil is attached to the power as the transmitter  to transmit power; another coil is attached to the bulb as an energy receiver. When powered, the transmitter can vibrate at 10 megahertz, and a light bulb connected to another coil will be turned on. This is where the famous Tesla coil comes from.

Tesla’s idea is feasible in theory, but in practice it faces the problem of how to improve transmission efficiency. Because electromagnetic waves transmit energy in space freely, they radiate out in all directions, especially microwaves.When scattered in space, energy depletes faster. This became the bottle-neck for countless scientists to study in the next hundred years.

Only at the beginning of this century, Marin Salt Leah Qi Qi, a physicist at the Massachusetts Institute of Technology, was not ready to do the problem of “terminator”. Before the efficacy distinguished wireless power transmission system was invented, he has been woken by “di di” sound of “insufficient battery”  for three nights. He then thought: “why can’t the electrical in wall be transmitted directly to my phone?”

This is the origin of magnetic resonance wireless transmission technology.According to this theory, as long as the electromagnetic energy transmitter and the receiving device can resonate at the same frequency, they can exchange energy.

Szoliacic and his team succeeded in turning on a 60-watt electric lamp 2.13 metres away from the transmitter and greatly improving transmission efficiency under this principle. Since then, many scientists around the world have carried out follow-up studies based on this experiment. Some experts say this technology can achieve wireless transmission about 10 meters away indoor.

For some low power and short distance power transmission, electromagnetic induction wireless transmission technology is more suitable. Because of electromagnetic induction, magnetic coupling can be used to transfer electric energy between the transmitting coil and the receiving coil. Of course, the distance is very close, about 1 centimeter below, can be described as  “stick”each other.

In addition, to achieve high power and long-distance power transmission, it can only rely on the remote field radiation technology of microwave or laser. Because the shorter a radio wave is, the better its orientation is and the less diffuse it is. A recent breakthrough by Japanese scientists is based on the properties of microwaves.

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