Wireless charging technology to be solved
Just as people now have side effects such as interference and radiation on Wi-Fi wireless signals and cell phone antennas, there are still many security questions about the wireless charging technology that has just emerged. For example, does it generate electromagnetic radiation? There are concerns about usage restrictions and increased price of digital products. For the most core security issues, professionals believe that, in theory, this system is completely harmless to people in the charging field, because the power is only transmitted between coils that resonate at the same frequency; despite the power conversion of wireless chargers The rate is not particularly high, but with the gradual advancement of technology, I believe that one day it will catch up with the straight charger.
Electromagnetic waves have no authoritative answer to human radiation, and safety still needs to be solved step by step.
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The wireless charging system is specific to the security issue and mainly includes two levels. First, how to ensure that electromagnetic waves are only radiated to the receiving part of the mobile phone, without affecting human health or interfering with other equipment; second, let electromagnetic radiation not damage the battery and charger in case of wrong use, such as identifying foreign objects on the wireless charger. To prevent the risk of deformation or explosion caused by overheating of the lithium battery. Experts say that these must be achieved through a large number of hardware and software work. In the market development, there is still a need to gradually transition in stages, and there are still many problems to be solved.
Wireless charging coverage is small, power conversion rate is 30% lower than direct charging
At present, the wireless charger can not reach the coverage of the wireless network. Although the charging board and the receiver are two parts, they cannot be separated too far from each other, otherwise the charging efficiency will drop drastically or even fail to charge. In addition, the conversion rate of wireless charger charging is much lower than that of wired chargers, and the current maximum can only reach 70%. But this is already a very good result. Therefore, although there may be no large-scale popularization at this stage, wireless chargers will become a new development direction. Although the magnetic resonance method is theoretically good, it still encounters a lot of trouble in the actual design. Not only the parasitic capacitance and the external magnetic field, but even the connected device can interfere with the charging electromagnetic field, thus affecting the charging efficiency. In addition, the smaller the device, the more it is affected by external factors, making this technology difficult to apply to mobile phones. Wireless charging technology can only charge small appliances within 2 meters. The researchers hope to increase the effective charging distance to 30 meters.
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