The application of more and more commercial wireless charging coil, the coil is used more widely, the principle of wireless charging technology has not many mysterious things, in some of the intelligent mobile phone has been commercialized. The principle of wireless charging is also very simple, the transmitter will be converted into electrical energy and electromagnetic waves emitted, the receiving end to receive electromagnetic waves, and then converted into electricity, you can charge. At present, there are three different ways to achieve: electromagnetic induction, radio waves and magnetic resonance, the three is also a good or bad.
Electromagnetic induction, that is, the use of two mutual inductance coil for wireless charging. When the current input end coil in change, the output end of coil magnetic field will be changed, resulting in the induced current, which converts energy from input to output. The use of electromagnetic induction of the reasons for the wireless charging requirements of the distance between the two devices must be very close, and only one to one charge, charging must be aligned coil. However, the energy conversion rate is high, the transmission power range is large, from a few watts to several hundred watts.
Radio wave type, that is, by receiving radio waves for wireless charging, the principle of similar to the ore radio. But in this way the transmission power is very small, the highest is only 100 MW, and the effect is very low, most of the energy will be wasted in the form of radio waves. A slight advantage in transmission distance, the longest distance of 10 meters.
Magnetic resonance, that is, by means of electromagnetic resonance wireless charging, the principle is similar to the acoustic resonance, as long as the two media with the same resonant frequency, it can transmit energy. This way the charging distance between electromagnetic induction and radio wave type, has the advantages of large transmission power, can reach thousands of watts, can simultaneously to multiple devices for charging, does not require the coil between the two corresponding equipment; drawback is the loss is very high, the farther the distance, the greater the power transmission loss, but also more the trouble is, must protect the use of the band.
From the advantages and disadvantages of the above three ways, it is not difficult to find, only electromagnetic induction and magnetic resonance in the electric vehicle wireless charging on the possibility of achieving. However, what is good or bad, it depends on the market and the consumer to choose their own.
