"Wireless charging mobile phones, radiation is greater, easy to carcinogenic!"
Last night, Xiao Zhang put his newly purchased mobile phone on the bedside table to charge, which was opposed by his wife. The phone he bought used wireless charging, which his wife believed was stronger than the radiation from wired charging and was more likely to cause cancer.
"Blindly said, now so many mobile phones can use wireless charging, if it will cause cancer, it has long been banned by the state!" Xiao Zhang said indifferently.
"Even so, the mobile phone has radiation, and it can't be charged at the head of the bed!" The wife has a good word.
The two people quarreled for half an hour over the problem of wireless charging causing cancer, and finally ended the debate with the end of Xiao Zhang sleeping on the sofa.
Mobile phone wireless charging is becoming more and more popular, it gets rid of the shackles of the line, but many people do not understand wireless charging, and even think that it will cause cancer, is this true?
First, you can charge without a cable, what is the principle?
At present, there are three common wireless charging modes: electromagnetic induction, electromagnetic resonance and radio wave, of which electromagnetic wave induction is now the most widely used mobile phone, also known as Qi standard wireless charging.
Its technical principle is to install a transmission coil on the wireless charging base, install a receiving coil on the back of the mobile phone, and when the mobile phone is close to the charging base, the transmission coil will produce an alternating magnetic field because it is connected to alternating current. In the process of magnetic field change, the receiving coil on the mobile phone can receive the induced current, and finally transfer the energy from the transmitter to the receiving end to achieve the purpose of charging.
Doesn't that sound very tall? But the carcinogenic question that everyone wants to know the most has not been answered, don't worry! Little Ai this is the answer for you.
Second, the question is, will wireless charging really cause cancer?
Zhou Hongzhi, associate professor of the School of Applied Mathematics and Physics of Beijing University of Technology, said that mobile phones do produce a certain amount of radiation when charging, but unlike the radiation that will cause harm in our cognition, the radiation that can cause harm to the body is ionizing radiation, which generally exists in CT examination. The radiation generated by mobile phone charging is non-ionizing radiation, that is, electromagnetic radiation, which will hardly bring harm to the body and will naturally not cause cancer.
In addition, when wireless charging, the magnetic field generated is almost closed, and the radiation to the outside world is very small. As long as the standards used in line with the national 3C certification are used, you can rest assured.
Third, the mobile phone is placed at the head of the bed to charge, will it cause cancer?
The same problem, whether it is wired charging or wireless charging, usually the mobile phone is placed at the head of the bed to charge, and our brain is in close contact, will it cause cancer?
In this regard, Professor Li Wenliang, director of the Department of Cranial Brain Oncology of Tianjin Cancer Hospital, also debunked the rumors in an interview with the media, and there is currently no epidemiological evidence to prove that there is a correlation between mobile phones and increased risk of brain tumors. Taking China as an example, since the last 90s, the use of mobile phones has shown an "explosive" increase, but the incidence of brain tumors has not increased sharply, and there is no significant difference from the 90s before the 90s, when the use of mobile phones was not high.
Although mobile phones do not cause cancer, it is still not recommended to put the mobile phone at the head of the bed to charge before going to bed in life, which may bring some safety risks.
Fourth, although it does not cause cancer, it is still not recommended that the mobile phone be placed at the head of the bed for charging
1, the charger or mobile phone quality problems, easy to explode
I believe that many people have seen on the news, because of the accident of mobile phone explosion spontaneous combustion at night, the main reasons for the accident are two points, one is that the battery of the mobile phone itself has a problem, and it is very easy to explode when buying a defective battery; in addition to the problem of the mobile phone itself, the charger is also a big problem, if you buy some inferior or charging power mismatched charger, it may also cause an explosion when charging.
2. If the bedside temperature is too high, there is also a risk of mobile phone explosion
Mobile phone batteries are not resistant to high temperatures, and some people are accustomed to driving electric blankets or some other fire tools when sleeping, which is very easy to explode in this case.
3. Affect the quality of sleep
Playing mobile phones before going to bed is a habit that many people have, and even many people forget the time when they play, which directly leads to staying up late. Or when insomnia, the first reaction is to pick up the mobile phone, play and play with the infinite cycle, resulting in sleep quality affected.
Modern people are mostly "mobile phone control", while using mobile phones, we must pay attention to identifying rumors, and do not let ourselves fall into rumors and bring some unnecessary troubles.
Resources:
[1] "How to do "wireless charger" to do air charging". Guangming Network.2020.7.8
[2] "Wireless charging of mobile phones will cause cancer? Who said that! 》. People's Daily Science.2016.11.24
[3] "Is it science or a rumor that frequent use of mobile phones suffers from brain tumors?" 》. Science and Technology Daily.2017.4.28
[4] "Mobile phone explosion seriously injured husband and wife, children died!" Don't make 4 mistakes with your mobile phone, everyone will know the 4 signals before the explosion". Beiqing.2021.11.3