Electric vehicle wireless charging mainly has two ways: electromagnetic induction and magnetic resonance. The principle of electromagnetic induction charging is to use the electromagnetic induction between the primary coil and the secondary coil to generate current at a certain frequency, so as to transfer the energy from the transmission end to the receiving end, which has the advantage of high conversion efficiency, but the charging distance is shortIt can be charged one-to-one.
Automobile wireless charging technology refers to the non-contact power transmission through electromagnetic induction, magnetic resonance, radio frequency and other ways, so that electric vehicles can be charged without relying on charging cables. This technology avoids safety hazards such as leakage and electricity running, and is convenient to use, and the vehicle can be charged only when parked in a fixed position without supervision.
The wireless charging technology of electric vehicles, that is, through electromagnetic induction, magnetic resonance or radio frequency and other ways, realizes non-contact power transmission without charging cables. This technology avoids the leakage, running and other safety caused by traditional wired chargingAt the same time, the wireless charging system does not need an exposed connector, so it is more adaptable to a variety of harsh environmental and weather conditions.
Wireless charging of new energy electric vehicles is distinguished from the basic principle, mainly electromagnetic induction and magnetic resonance. The research of electromagnetic induction focuses on inductive charging, wireless charging, electromagnetic induction and charging station. The research of magnetic resonance focuses on the fields of wireless power supply, resonance frequency, induction coefficient, antenna and transmitter. Zte, BMW, Mercedes-Benz, etc., adopt the principle of electromagnetic induction technology, Qualcomm Halo, Witricity adopt the principle of magnetic resonance technology.
Wireless charging can be divided into low-power wireless charging and high-power wireless charging two ways, low-power wireless charging often uses electromagnetic induction, such as mobile phone charging. High-power wireless charging often uses magnetic resonance, and the power supply device (charger) transmits energy to the power device, which uses the received energy to charge the battery and at the same time for its own operation.
At present, there are three types of wireless charging methods:Electromagnetic induction type, magnetic resonance type, radio wave type.
Fuel cell vehicles In addition to charging new energy vehicles, there is a hydrogen-filled fuel cell vehicle, whose battery is a hydrogen-oxygen hybrid fuel cell. The cars can be refueled in just five minutes and have a range of up to 400 kilometers. In addition to the lighting function, the street lamp can also be used as a charging pile, and provide WIFI hotspot, video surveillance and other functions. At present, Beijing and Hangzhou and other places have carried out the transformation of street lamp charging piles.
Although wireless charging technology has many advantages, such as improving the charging experienceTo achieve wireless discharge to the power grid, but due to standards, costs, efficiency and other issues, its commercial landing is still facing challenges. However, with the continuous progress of technology and policy support, it is believed that wireless charging technology for electric vehicles will gradually become popular in the future. The Ministry of Industry and Information Technology (MIIT) recently issued regulations to raise the charging power limit of mobile devices such as mobile phones to 80W and apply wireless charging technology to electric vehicles. This means that the era of wireless charging for electric vehicles may be coming. Wireless charging technology, that is, wireless power transmission technology, is a non-contact mode of power transmission. Mainly through electromagnetic induction, magnetic resonance