1 brief introduction of wireless charger
Connection between mobile phones
Wireless charger is a charger that is connected to a terminal device that needs to be recharged without a traditional charging power line. The latest wireless charging technology is used. The wireless charging technology has 20 patents in 2007. A variety of devices can use a charging base station, mobile phones, MP3 sowing devices, electric tools and other power supplies. The wired charging status of the adapter will not exist. By using the magnetic field generated by the coil and transmitting the electric energy miraculous, the inductively coupled technology will become a bridge connecting the charging base station and the equipment.
2 principle of wireless charger
The wireless charging system mainly adopts the electromagnetic induction principle to transmit energy through the energy coupling of the coil. As shown in the diagram, when the system works, the input terminals convert AC power to DC power through the full bridge rectifier circuit, or directly supply the system with 24V DC terminals.
After the power management module, DC output is converted to high frequency alternating current by 2M active crystal inverter to supply the primary winding. Through the coupling of 2 inductance coils, the output current of the secondary coil is changed to DC by charging and converting circuit to charge the battery.
The changing magnetic field produces a changing electric field, and the battery changer electric field produces a changing magnetic field. The size of the magnetic field is related to their change rate, and the change rate of the sinusoidal function is another sine function, so the electromagnetic wave can spread out, and the induction voltage is related to the change of magnetic flux, so the coil changes inside the coil. The induced magnetic field generates the induced voltage to complete the charging process.
Mobile wireless charging is a relatively new way of charging. Its principle is very simple. It is to separate the main transformer from the ordinary transformer to achieve the purpose of wireless. Of course, the frequency of wireless charging is relatively high, and even the core can be discarded, so that the energy transfer can be achieved between the direct coils.
3 features of the wireless charger
1. In theory, wireless charging technology has no harm to human security. The resonance principle of wireless charging is magnetic resonance, which is transmitted only between coils that resonate at the same frequency, while other devices cannot accept bands. In addition, the magnetic field used by the wireless charging technology itself is harmless to the human body. But, after all, wireless charging is a new type of charging technology, and many people are concerned that the wireless charging technology is just as Wi-Fi and mobile antenna poles have just appeared, but the technology itself is harmless.
2. Wireless charging technology uses magnetic resonance to transmit electric energy, coil and capacitor between electric field and magnetic field between charger and device.
3, the system can be widely used in the future, such as charging area for electric vehicles and power transmission for computer chips. The charging system developed by this technology needs only 1/150 of the current charging time.
4, the conversion rate has been a problem that many people have been worried about. The study of Massachusetts Institute of Technology has shown that the loss of wireless charging technology is lower than that of cable charging. The conversion rate of wireless charging is several percentage points higher than that of wired. High conversion is also a key factor in the application of wireless charger in the world. But wireless charging technology is also limited by distance. In the future development, it is necessary to solve the problem of long distance transmission for precise positioning of band and magnetic field.
5, the core chip is one of the difficulties of wireless charging technology in product application. Precision radiation range control, magnetic field frequency and other control are realized by chip.
4 selection and purchase of wireless charger
1, identify QI certification
2, identify professional brand
3, the price can not be too low
4, the conversion efficiency is high, the charging speed is fast
5. The working temperature can't be too high
6, the protection function should be complete [detailed >]
5 how to use the wireless charger
1, the wireless charging function of the mobile phone on the wireless charging board, position to be placed, can be charged, attention to some wireless charge panel support mobile phone model different, according to the model of their own mobile phone to choose the wireless charging panel.
2. It does not support long distance charging. It may be possible to achieve this technology in the future, what is wireless charging technology. According to a report in the United States, research institutions have developed remote wireless chargers. The charger includes a transmitter with a plug, an electronic receiver, as long as it is in a certain range. The internal power source can be transmitted to the terminal equipped with the receiver.
3, wireless charger is transmitted by radio wave. Radio wave is not only a kind of electromagnetic wave, but also can transmit energy, and it can penetrate air. Therefore, it makes wireless power transmission possible. [detail >]
6 is the radio charger radiant
Researchers at the Massachusetts Institute of Technology say the body reacts very strongly to the electric field, but the body has little response to the magnetic field, so the system does not affect the health of the body. However, this is only a speculation. Some researchers are worried about this view. Further tests are needed before the real life is applied.
As an electronic charging product, the charger itself can not avoid radiation, so the radiation of wireless charger is inevitable. But the power of the wireless charger is very small, the charging time is longer, the radiation generated is also small, it should not cause much harm to people.