With the addition of the wireless charging function of big-name mobile phones, wireless charging technology has gradually become known to the public. This is not a novel technology, but many people still don’t understand it.
One of the issues is whether wireless charging has radiation. Some netizens even said: “The radiation of wireless chargers is greater than that of mobile phone networks?” So, how much radiation does seemingly high-tech wireless chargers bring in our daily use? Will it harm our health and safety? Let’s talk in detail with you all below.
The principle of wireless charging is actually very simple. The well-known principle of electromagnetic induction is used as its theoretical basis. Simply put, when current flows through the coil, a magnetic field will be generated, and the coil close to the magnetic field will generate an induced current, thus realizing the current. Wireless delivery.
The whole process is actually very simple, just like a transformer, the iron blocks are connected between the two coils, and wireless charging turns the iron blocks into air, thus realizing wireless charging. In contrast, the efficiency of the transmission medium is different, the magnetic field in the air, the loss of energy is very large, the solution is to increase the voltage and power, realize the concentrated transmission of energy, so as to offset the energy in the air Lost in.
Like high-voltage wires, long-term living within the magnetic field of high-voltage wires will have a certain impact on our health. How much harm can the magnetic field generated by wireless chargers bring to our lives and health?
Before this, CCTV had done a small experiment on such a problem, and they invited the staff of the Beijing Telecom Business Office to test it. The staff uses a high-sensitivity radiation tester, which can measure the radiation value of mobile phones and other items and can also sense the degree of electromagnetic pollution in the surrounding environment. The higher the value, the more serious the radiation.
Using a high-sensitivity radiation tester to measure the wireless charger, after the power is connected, compared to the increased radiation when the power is turned off, the radiation intensity of the wireless charger is obtained. After turning on the power, the value increased from 150 to 180. The increment is not very obvious, but it proves that there is indeed magnetic field radiation.
At the same time, the staff also measured the magnetic field radiation generated by the mobile phone during use. Compared with wireless chargers, the radiation of mobile phones is much larger. Some mobile phones have a radiation value of up to two thousand at the moment the call is connected, and some mobile phones have a value of 427 at the moment of connection. After being switched on, it gradually drops to around 200.
The radiation of wireless chargers does not seem to be as big as imagined, but it does not rule out that there are some low-quality products on the market, which do not meet the relevant regulations and standards and cannot be judged well. However, according to the current more general “Electromagnetic Radiation Protection Regulations” 》, the average specific absorption rate (SAR) of the whole body of an ordinary user for any continuous 6 minutes in a day and 24 hours should be less than 0.02W/kg.
Of course, all electromagnetic fields will bring a certain amount of magnetic field radiation. The key lies in the strength of the magnetic field and the difference in the sensing distance of the magnetic field, which brings about the strength of the radiation.
The stronger the electromagnetic field, the stronger the magnetic field radiation. At the same time, the energy transmission distance is proportional to the strength of the electromagnetic field. The higher the power of the electromagnetic field, the greater the magnetic field radiation. When the electromagnetic field radiation reaches a certain level, Or people living in a strong magnetic field for a long time will cause certain harm to our human body.
According to experts, electromagnetic radiation of more than 2 milligauss can cause people to suffer from diseases. The first ones are human skin and mucosal tissues. The symptoms are swelling of the eyelids, eye congestion, nasal congestion and runny nose, throat discomfort, or repeated urticaria on the skin all over the body. , Eczema, itching, etc.; Vitiligo, psoriasis, allergic purpura, etc. may occur when the immune function of the human body is affected.
Mobile phone wireless charger does bring some radiation to our body, but the electromagnetic radiation level is low. At the same time, in daily use, the wireless charger can only work close to the mobile phone, and the distance between the wireless charger and the person is relatively large, and the real damage caused is very little.
Generally speaking, the wireless charger for mobile phones is still very safe in daily use, so you can buy and use it with confidence. Of course, if you want the charging speed to be extremely fast, or even reach the speed of charging in seconds, a large wireless charger similar to a car is used to charge a mobile phone, and it will still cause magnetic field radiation damage when used at close range. It is not recommended to play this way.
If there is a friend in the future saying “Wireless charger radiation is greater than a mobile phone?” We can tell him the correct answer loudly.