What are the wireless charger? Wireless charger hurts the phone

Wireless charger refers to the charger that does not use the traditional charging power cable to connect to the terminal device that needs to be charged. The latest wireless charging technology is adopted. By using the magnetic field generated between the coils, the magical transmission power will be inductively coupled. Become a bridge connecting charging base stations and equipment.

1. Theoretically speaking, wireless charging technology is not harmful to human body safety. The principle of resonance used in wireless charging is magnetic resonance, which is transmitted only between coils that resonate at the same frequency, while other devices cannot receive bands. In addition, wireless charging technology The magnetic field used is inherently harmless to the human body. However, wireless charging technology is a new type of charging technology. After taking advantage of the wireless source charger from Maiyuan Technology, many people are worried that wireless charging technology will be the same as Wi-Fi and the antenna of a mobile phone. The technology itself is harmless. .

2. The wireless charging technology uses magnetic resonance to transmit electrical energy between the charger and the device in the electric and magnetic fields. The coil and the capacitor form a resonance between the charger and the device.

3, this system can be widely used in the future, such as the charging area for electric vehicles and the power transmission to the computer chip. The charging system developed using this technology requires only one-hundred and one-fifth of the current charging time.

4. The conversion rate has always been a concern for many people. MIT showed that the wireless charging technology has a lower loss than wired charging technology. The wireless charging conversion rate is a few percentage points higher than that of cable. High transformation is also a key factor in the application of wireless chargers worldwide. However, the wireless charging technology is also limited by the distance. In the future development, it is necessary to solve the problem of the long-distance transmission for the precise positioning of the band and the magnetic field.

5. The core chip is one of the difficulties in the application of wireless charging technology. Accurate radiation range control, magnetic field frequency, other controls are all implemented by the chip.

The wireless charging system mainly adopts the principle of electromagnetic induction, energy coupling through the coil to achieve energy transfer. As shown in the figure, when the system is working, the input terminal will convert the AC mains power into DC power through a full-bridge rectifier circuit, or use a 24V DC power supply directly to supply power to the system.

After passing through the power management module, the DC output is converted into high-frequency alternating current through the 2M active crystal oscillator to supply the primary winding. By coupling the energy of the two inductive coils, the current output by the secondary coil is changed into a direct current by the receiving converter circuit to charge the battery.

A changing magnetic field produces a changing electric field. A changing electric field produces a changing magnetic field whose size is related to their rate of change. The rate of change of the sine function is another sine function, so the electromagnetic wave can propagate out and the induced voltage The generation of the magnetic flux is related to the change of the magnetic flux, so the magnetic field inside the coil generates an induced voltage, thereby completing the charging process.

Mobile phone wireless charging is a relatively novel charging method. Its principle is actually very simple. It is to separate the ordinary transformer main and secondary to achieve the purpose of wireless. Of course, the operating frequency of wireless charging is relatively high, and it is even possible to abandon the core directly to achieve energy transfer between the coils.

(1) There is no winding, simple and beautiful, looks comfortable, and the quality of life is higher;

(2) It does not need to be plugged and unplugged frequently, that is, it is quick and convenient, so that your mobile phone will never be short of electricity;

(3) Don't worry about the incompatibility between Samsung and Apple connectors. Support standard wireless chargers such as Qi to charge;

(4) There is no risk of electrified telephone receiving electric shock, completely avoiding safety problems, and can answer the telephone at any time;

(5) Let the battery work longer life, because it is ready to charge, so that the battery does not lack of electricity, the battery life is longer.

(6) No wired interface is required, and many products can be made fully enclosed waterproof products.

With the improvement of living standards, people have started to have their own cars. However, when we drive out, we will encounter some problems. Therefore, we can use some other products to make us more convenient. The car wireless charger is our driving. Go out to protect an item that is essential to safety.

Car wireless chargers and inlaid wireless chargers are a good choice for car owners who want to travel. Besides being able to charge their own mobile phones, it is convenient for mobile phones to be fixed and answered.

Desktop wireless chargers and portable wireless chargers are a good choice for friends at home or on the move. The frequency of the traditional charger cable data line is solved by solving the problem that the conventional data line is constantly plugging and unplugging the bad USB.

The wireless charger will not harm the mobile phone under normal circumstances. The current working frequency of wireless charging is below 1M, so it will not affect the signal of the mobile phone. Wireless charging also has no impact on the battery life of mobile phones. It is basically the same as wired charging, but its speed is lower. However, the wireless charger's power conversion rate is still very high, resulting in more energy savings. Wireless chargers mainly use inductive coupling technology. Because of the coupling technology, mainly through the coil's magnetic field to generate current, the battery's internal components can not constitute a magnetic field, so the internal structure of the battery will not be damaged during the power-on process. Most of the current mobile phones in the market conform to the QI wireless charging standard. A built-in wireless receiver has a rated voltage and current, so the wireless charger has no effect on the mobile phone.

1. Please use original or 3C certified products for charging plug

As an electrical product, it is recommended to use the plug made by the factory. One is because it is specially developed for your mobile phone, and the charging speed is guaranteed. Secondly, the security is guaranteed. In addition, other 3C products with the same parameters as the original plug can also be used with confidence. 3C certified products have requirements for using safety from design to production, and safety is guaranteed. Because the use of low-quality chargers causes explosions and woundings that are too numerous to mention, there is not much to say here.

2. Is the charging cable selected?

Charging line is the same reason, it is best to use the original charging line, core material inside the charging line, wire diameter, as well as the material of the charging interface metal contact sheet, the size will determine the size of the current that can carry. After anatomy, the diameter of the inferior charging cable is obviously smaller than the national value, and there is no insulating protective film inside. If poor quality charging lines are used, one is poor insulation performance, and the load current is small. As a result, the charging speed becomes slower, the batteries are seriously damaged, and even electric shocks and fire accidents are caused.

3, the first charge should not be too long

The first time charging doesn't need to be full for 12 hours. This is what the old battery needs to do. Now the battery is basically a lithium battery or a polymer lithium battery. The first charge only needs to be like the normal charge. !

4, the number of charging

There is a saying: each cell phone battery has a fixed number of charge, if the number of charging too much, it will speed up the battery aging strain! In fact, this is wrong, and the number of times the lithium battery is charged is completely charged and discharged. Therefore, it is best to use it with charge.

5, the new phone needs to be activated?

The new mobile phone needs to use all the electricity in the mobile phone, and then charge it, and it needs to operate 3-4 times repeatedly. This is called activation. The previous cell phones all needed to do this, but now lithium batteries are no longer needed.

6, while charging to play

According to the technical standards and the control of the company's specifications, mobile phones and wireless chargers should be used safely. Under normal circumstances, there are no problems in answering calls when charging. However, the market is flooded with many inferior chargers. Such chargers cannot meet safety requirements and are prone to soft breakdown and other dangers. Therefore, users are reminded not to buy chargers that are too cheap. It is better to buy 3C chargers and look for charging. The security identifier 3C on the device. Therefore, if you use three products, you need to be vigilant while you are charging and playing with mobile phones. Inferior chargers are easy to die, and if you have unexpected problems, they may be fatal!

7, overcharged

In the battery safety test experiment, it will continue to charge for 7 hours with full charge, and the output voltage will increase to 1.06 times the standard voltage. In addition, the battery itself also has a protection circuit, so no danger will occur and it will not explode. But if you use a poor quality battery, it would be hard to say. The explosion of the Samsung mobile phone illustrates this point. Therefore, it is best to unplug the charger after it is fully charged.

8, charge without wearing sets

In order to protect our mobile phones, which are basically inseparable from it, many people choose to wear them to their mobile phones! However, we do not know that lithium batteries are very afraid of heat and will heat up when they are charged, so it is best to take off the mobile phone case and charge it.