One night, Xiao Zhang put his newly bought mobile phone on the bedside table to charge, which was opposed by his wife. The mobile phone he bought uses wireless charging. His wife believes that this charging method has stronger radiation than wired charging and is more likely to cause cancer.

"Nonsense, now so many mobile phones can use wireless charging. If it would cause cancer, it would have been banned by the state!" Little Zhang man said indifferently.

1、 What is the principle of charging without wires?

At present, there are three common wireless charging modes: electromagnetic induction, electromagnetic resonance and radio wave. Among them, electromagnetic wave induction is the most widely used one of mobile phones, also known as Qi standard wireless charging.

Its technical principle is to install the transmitting coil on the wireless charging base and the receiving coil on the back of the mobile phone. When the mobile phone is close to the charging base, the transmitting coil will generate alternating magnetic field because it is connected with AC. 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 transmitting end to the receiving end, so as to achieve the purpose of charging.

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2、 The question is, can wireless charging really cause cancer?

Zhou Hongzhi, associate professor of the school of Applied Mathematics at Beijing University of technology, said that mobile phones do produce certain radiation when charging, but different from the radiation that can 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. This kind of radiation does little harm to the body and naturally will not cause cancer.

In addition, the magnetic field generated during wireless charging is almost closed, and the radiation to the outside world is very small. As long as the use is in line with the national 3C certification standard, you can rest assured.

3、 Will it cause cancer if the mobile phone is charged at the head of the bed?

The same question, whether wired charging or wireless charging, usually put the mobile phone at the head of the bed to charge, close contact with our brain, will it cause cancer?

In this regard, Professor Li Wenliang, director of brain Oncology Department of Tianjin Cancer Hospital, also refuted the rumor in an interview with the media. At present, there is no epidemiological evidence to prove the correlation between mobile phones and the increased risk of brain tumors. Taking China as an example, since the 1990s, the utilization rate of mobile phones has increased "explosively", but the incidence of brain tumors has not increased sharply, which is not significantly different from that before the 1990s.

Although the mobile phone will not cause cancer, it is not recommended to put the mobile phone at the head of the bed to charge before going to bed, which may bring some potential safety hazards.

4、 Although it is not carcinogenic, it is not recommended to put the mobile phone at the head of the bed for charging

1. The charger or mobile phone has quality problems and is prone to explosion

I believe many people have seen on the news that there are two main reasons for the accident due to the explosion and spontaneous combustion of mobile phones at night. First, there is a problem with the battery of mobile phones. It is very easy to explode if you buy defective batteries; In addition to the problems of the mobile phone itself, the charger is also a big problem. If you buy some low-quality or mismatched charger, it may also cause an explosion during charging.

2. If the bedside temperature is too high, there is also a risk of cell phone explosion

Mobile phone batteries are not resistant to high temperature. Some people are used to turning on electric blankets or other fire tools when sleeping. In this case, it is very easy to explode.

3. Affect sleep quality

Playing with mobile phones before going to bed is a living habit of many people. Even many people forget the time when playing, which directly leads to staying up late. Or in insomnia, the first reaction is to pick up the mobile phone and play with it, which will have an infinite cycle, resulting in the impact of sleep quality.

Most modern people are "mobile phone control". When using mobile phones, we should pay attention to screening rumors and avoid unnecessary troubles caused by rumors.