What Is an Electric Power Transmission?

Wireless power transmission uses radio to convert the power produced by the power plant into radio waves and send them out, and then collect and convert the radio waves into electricity for use by specific receiving devices.

Nowadays, more and more electronic products have brought great convenience to people's work and life. However, most of the traditional power transmission methods transmit power to terminal products through wires or sockets. With the popularity of mobile devices, wireless data transmission, and wireless network technology, people hope to get rid of the shackles of traditional power transmission methods and lift the troubles caused by chaotic power lines. As a result, wireless power transmission technology has become the most anticipated technology in the 21st century, and wireless charging products have become a new focus of attention. At present, many countries around the world are researching and developing wireless power transmission technologies, exploring the application of wireless power transmission systems in different fields, and working to make them practical.

Wireless Power Transmission (WPT) is also called wireless energy transmission or wireless power transmission, which is achieved through electromagnetic induction and energy conversion. Wireless power transmission mainly realizes non-contact power transmission through electromagnetic induction, electromagnetic vibration, radio frequency, microwave, laser and other methods. According to the different power supply distances for wireless power transmission in space, the wireless power transmission forms can be divided into three categories: short-range, medium-range and long-range transmission.

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Will the current be "thundered" by letting the current spread through the air? The researchers said that the wireless power transmission technology used in "tailless TV" does not generate radiation, and its safety has passed

According to the prediction of the Wireless Charging Alliance, by 2016, the global wireless charging market output value may reach 27 billion U.S. dollars. "In the future, wireless charging technology will be as popular as Bluetooth." Industry insiders predict.

For consumers, the significance of wireless charging is not just to bring convenience to charging methods. With the expansion of wireless charging technology from low-power devices such as mobile phones and tablets to large-scale devices such as laptops, smart TVs and even electric cars, More surprises are worth looking forward to.

According to the Yomiuri Shimbun, a Japanese company announced on the 12th that a wireless power transmission technology test was successful, that is, transmitting electricity to a place 500 meters away in the form of microwave without passing through a cable. In the experiment, 10 kilowatts of electricity was converted into microwaves, which were transmitted to a panel-shaped receiving device 500 meters away through an antenna, and then the received microwaves were reduced to electricity. Finally, the light-emitting diode was successfully lit with electricity.

It is reported that the universe is not affected by the weather, so solar power generation is 10 times more efficient than the surface of the earth. And how to transfer the solar power from the space to the ground 36,000 kilometers away from the ground is one of the keys to achieving space solar power. In the next few years, Mitsubishi plans to apply the current transmission technology to mountain power transmission projects in order to achieve practicality as soon as possible. ^[2]

The main obstacles to wireless power transmission are the efficiency and distance of wireless power transmission. The dispersion, absorption, and attenuation of radio waves are difficult points for wireless power transmission. In the process of transmitting energy in free space, electromagnetic waves are emitted to all directions, which is difficult to concentrate and has poor directivity. During wireless transmission, air is used as a coupling medium, and the magnetic field lines of the power carrier will have great losses, especially microwaves, which diffuse in space , Energy exhausts faster. Therefore, the wireless power transmission power is low, the overall efficiency is poor, it is difficult to transmit a large amount of energy, and it is difficult for power to perform high-power long-distance wireless transmission. For wireless charging, the charger and the device to be charged are connected in the form of a magnetic field. Various kinds of interference will cause the loss of energy transmission. The problems of small energy transmission and small transmission range of the electromagnetic induction method also restrict the electric vehicle. Development of wireless charging ^[3] .

The scale of wireless power transmission projects is huge, and wireless power transmission systems have to solve two major problems of power production and transmission. In addition, for wireless charging products, wireless charging devices must be certified by relevant agencies, and a relatively mature business model needs to be found to open the market gap. In addition, it is necessary to improve and perfect the wireless charging technology, and it is necessary to form an internationally accepted standard to enable wide compatibility between transceivers.