How does a wireless charger charge your phone?
Wireless charger is a wireless power transmission device that powers consumer electronics such as mobile phones, smart watches, and tablets.
It means that you don't need to plug the cable into your smartphone to do the charging;
The electromagnetic induction principles that apply are our high school physics;
The schematic diagram is as follows
Wireless charger principle
The application of electromagnetic induction principle to power supply is very common in our lives, such as our bus card, the bus card has a coil, when our card is close to the card machine, the coil inside will magnetically induce current, and then the current to the chip in the card power supply, the card machine can read the information in the chip to see, complete the entire card swiping process;
It's just that the power supply of the bus card is very small,
Like the power of the induction cooker is very large (generally about 2000W), it can heat the metal to several hundred degrees for cooking;
Profile of a wireless charger
02Can mobile phones and wireless chargers that support wireless charging be used at will?
No
Wireless charging is a unified standard, the current internationally recognized wireless charging standard for mobile phones, tablets, desk lamps, car mobile phone brackets, smart watches and other digital products is the Qi standard;
03What are the advantages and disadvantages of wireless chargers?
merit:
1, durability - do not need to frequently plug and unplug the device, can reduce the wear of the charging port;
Because the charging interface is just a panel, it can be embedded in more flat scenes, which is more hidden and beautiful;
2. The charging interface can be sealed to reduce the risk of short circuit or leakage;
3. Vehicle wireless charging can be more convenient charging, eliminating the risk of plugging in and unplugging the power cord to driving safety;
shortcoming:
1, can not be through the metal to charge the mobile phone, which means that the mobile phone that supports wireless charging can only use plastic or glass back cover;
The penetration distance of wireless charging is also limited, generally within 6cm, the farther away, the slower the charging speed, the back cover of the mobile phone can not be too thick, friends who like to use the mobile phone case must pay attention to the thickness when choosing the mobile phone case;
2. Compared with wired charging, the efficiency of wireless charging is lower
The magnetic field propagates in all directions, resulting in an induction coil current that is much smaller than the charger's input current, and the conversion efficiency is not high enough;
And more heat will be generated during the conversion process, which is bound to increase the temperature of the battery and affect the charging efficiency;
3, the cost is higher, wireless power supply requires more electronic components, increasing the complexity and cost of the product;
4. During the charging process, the mobile device cannot be moved, and the device must be closely attached to the charging board;
Poor compatibility, not all devices that support wireless charging and chargers are matched, this and our mobile phone data charger the same, will have different interface standards;
04What problems do you need to pay attention to when purchasing a car wireless charger?
1. Compatible equipment
Whether to support android and Apple at the same time, the size of the mobile phone, etc
2. Whether it has a self-protection function
The efficiency loss during charging will be converted into thermal energy, so the general car wireless charger is equipped with temperature detection and power failure reminder function, if these safety mechanisms fail, the mobile phone may be damaged or the battery exploded;
Wireless charging, smart phones tend to become very hot, plus the charger itself is also heating, so if the heat dissipation is fast and effective, it becomes very important;
Therefore, the basic security function is still necessary;
3. Charging fast or slow
Charging fast and slow is also our focus, most of the current manufacturers are by increasing the power to achieve the purpose of fast charging (also need your mobile phone support), and some manufacturers by using ultra-thin coils, higher AC frequency and optimization of electronic lines and other ways to reduce transmission losses, in order to achieve more efficient charging;
4. Pay attention to the voltage and current of the wireless charger
Some wireless chargers support a variety of devices, and the current of the device is 5V/2A or 5V/1A;