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　　What types of wireless chargers are there? Will wireless chargers damage mobile phones?

　　Wireless chargers refer to chargers that do not use traditional charging power cords to connect to terminal devices that need to be charged. They use the latest wireless charging technology and magically transmit electrical energy by using the magnetic field generated between coils. Inductive coupling technology will Become a bridge connecting charging base stations and devices.

　　Wireless charger features

　　1. Theoretically speaking, wireless charging technology is safe and harmless to the human body. The resonance principle used in wireless charging is magnetic field resonance, which only transmits between coils that resonate at the same frequency, while other devices cannot accept the wave band. In addition, wireless charging technology The magnetic field used itself is harmless to the human body. But wireless charging technology is a new charging technology after all. Taking Maiyuan Technology’s wireless charger as an example, many people worry that wireless charging technology will be like when Wi-Fi and mobile phone antenna poles first appeared. In fact, the technology itself is harmless. .

　　2. Wireless charging technology uses magnetic resonance to transmit electrical energy in the electric and magnetic fields between the charger and the device, and the coils and capacitors form resonance between the charger and the device.

　　3. This system can be widely used in the future, such as charging areas for electric vehicles and power transmission for computer chips. Charging systems developed using this technology require only one-hundred and fifty-fifth of the current charging time.

　　4. Conversion rate has always been a concern for many people. Research by the Massachusetts Institute of Technology shows that the loss of wireless charging technology is lower than that of wired charging technology. The conversion rate of wireless charging is several percentage points higher than that of wired charging. High conversion is also a key factor in the global application of wireless chargers. However, wireless charging technology is also limited by distance. Future development will inevitably need to solve the problem of precise positioning of the wave band and magnetic field range for long-distance transmission.

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

　　How wireless chargers work

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

　　The DC power output after passing through the power management module is converted into high-frequency AC power by a 2M active crystal oscillator inverter and supplied to the primary winding. The energy is coupled through the two inductors, and the current output by the secondary coil is converted into direct current by the receiving conversion circuit to charge the battery.

　　A changing magnetic field will produce a changing electric field, and a changing electric field will produce a changing magnetic field, the size of which is related to their rate of change. The rate of change of a sine function is another sine function, so electromagnetic waves can spread out, and the induced voltage The generation is related to the change of magnetic flux, so the changing magnetic field inside the coil generates an induced voltage, thus completing the charging process.

　　Wireless charging for mobile phones is a relatively new charging method. Its principle is actually very simple. It is to separate the primary and secondary parts of an ordinary transformer to achieve wireless purposes. Of course, the working frequency of wireless charging is relatively high, and the iron core can even be abandoned to transfer energy directly between coils.

　　What types of wireless chargers are there? 1. Desktop wireless charger

　　(1) There is no tangle of wires, it is simple and beautiful, looks comfortable, and has a higher quality of life;

　　(2) No need to plug and unplug frequently, it can be charged as soon as it is put in, which is convenient and fast, so that your mobile phone will never run out of power;

　　(3) Don’t worry about incompatibility between Samsung and Apple connectors, wireless chargers that support Qi and other standards can charge;

　　(4) There is no risk of electric shock when charging and answering calls, completely avoiding safety issues, and you can answer calls at any time;

　　(5) Make the battery have a longer working life. Because it can be charged immediately after discharge, the battery will not be short of power and the battery life will be longer.

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

　　2. Car wireless charger

　　With the improvement of living standards, people have begun to have their own cars. However, when we drive out, we will encounter some problems, so we can borrow some other products to make it more convenient for us. Car wireless chargers are the most important thing when we drive. A must-have item for safety when going out.

　　3. Portable wireless charger 4. Summary of embedded wireless charger:

　　Car wireless chargers and embedded wireless chargers are a good choice for car owners who travel. In addition to charging their own mobile phones, they are also convenient for fixing mobile phones and making and receiving calls.

　　Desktop wireless chargers and portable wireless chargers are a good choice for friends at home or traveling. It solves the problem of the frequency of traditional data cables being constantly plugged and unplugged and breaking the USB. It also solves the frequency of traditional charger data cables being lost.

　　Will the wireless charger damage the phone?

　　Wireless chargers will not harm mobile phones under normal circumstances. The current working frequency of wireless charging is below 1M, so it will not affect the signal of mobile phones. Wireless charging has no impact on the battery life of mobile phones. It is basically the same as wired charging, but the rate is lower. However, the power conversion rate of the wireless charger is still very high, saving more energy consumption. Wireless chargers mainly use inductive coupling technology. Because coupling technology mainly generates current through the magnetic field of the coil, the internal components of the battery itself cannot form a magnetic field, so the internal structure of the battery will not be damaged during the power-on process. Currently, most mobile phones on the market comply with the QI wireless charging standard and have built-in wireless receivers. They have rated voltage and current, so wireless chargers have no impact on mobile phones.

　　Things to note when using wireless chargers

　　1. Please choose the original charging plug or a product with 3C certification.

　　As an electrical product, it is recommended to use plugs produced by the original factory. Firstly, because it is specially developed for your mobile phone, the charging speed is guaranteed, and secondly, safety 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 safety from design to production, and safety is guaranteed. Because the use of inferior chargers has caused explosions and injuries, there are countless things that I won’t go into here.

　　2. Is the charging cable selected correctly?

　　The same goes for charging cables. It is best to use original charging cables. The core material and wire diameter in the charging cable, as well as the material of the metal contact piece of the charging interface, will determine the amount of current it can carry. After dissection, it was found that the diameter of the inferior charging cable was significantly smaller than the national specified value, and it was not wrapped with an insulating protective film. If you choose an inferior charging cable, firstly, the insulation performance is poor and the current it carries is small, which can slow down the charging speed, seriously damage the battery, and even cause accidents such as electric shock and fire.

　　3. The first charging time should not be too long.

　　The first charge does not require a full charge of 12 hours. This is what old-fashioned batteries need to do. Today's batteries are basically lithium batteries or polymer lithium batteries. The first charge only needs to be charged as usual. !

　　4. Number of charging times

　　There is a saying: Each mobile phone battery has a fixed number of charging times. If it is charged too many times, it will accelerate the aging and strain of the battery! In fact, this is wrong. The number of charging times of a lithium battery refers to complete charge and discharge, so it is best to charge it as you use it.

　　5. Does the new phone need to be activated?

　　A new mobile phone needs to use up all the power in the phone and then recharge it, and it needs to be repeated 3-4 times. This is called activation. Previous mobile phones required this, but today’s lithium batteries no longer require it.

　　6. Play while charging

　　According to technical standards and corporate regulations, mobile phones should be safe when used with wireless chargers www.ymp-hk.cn. Under normal circumstances, there will be no problem making and receiving calls while charging. However, the market is flooded with many inferior chargers. Such chargers cannot meet safety requirements and are prone to dangers such as soft breakdown. Therefore, users are reminded not to buy chargers that are too cheap. It is best to purchase 3C certified chargers and be sure to charge correctly. Safety mark 3C on the device. Therefore, when using Sanwu products, you need to be vigilant when using your phone while charging. A low-quality charger can easily die, and if an unexpected problem occurs, it may be fatal!

　　7. Overcharging

　　In the battery safety test experiment, it will continue to charge for 7 hours when fully charged, and the output voltage will increase to 1.06 times the standard voltage. In addition, the battery itself also has a protection circuit, so it will not cause danger or explode. But if inferior batteries are used, it's hard to tell. The Samsung mobile phone explosion incident illustrates this point. Therefore, it is best to unplug the charger as soon as it is fully charged.

　　8. Don’t wear a condom when charging

　　In order to protect our mobile phones that we cannot live without, many people choose to wear mobile phone cases! But everyone doesn’t know that lithium batteries are very sensitive to heat and will generate heat when charging, so it is best to take off the mobile phone case to charge.

　　Technology Zone llano LJN-WX002 wireless charger disassembly Samsung S9 original charger does not support QC2.0 fast charging Is it true or false_Samsung S9 charging capability evaluation Mophie, Belkin and Anker wireless charger comparison evaluation How about LG charger _In-depth review of the new TK-QC3pD Rutronik won the "China Electronics Business News" magazine for its innovative hybrid energy storage system

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