Now the 5V mobile phone charger is charging too slowly. I have seen some mobile phones selling fast charging before. Why is the charging speed of some mobile phones slow, and some mobile phones charge faster? What influences the charging speed of mobile phones? How to improve the charging speed? The charging process of smart phones is mainly completed by three parts: power adapter, data line, mobile phone. The speed of charging is affected by many factors. The internal factors include the mobile phone itself, power adapter, and data cable, while the external factors include the weather, the way users use the mobile phone, and so on, all affect the charging rate of the mobile phone.
The mobile phone with large battery capacity takes a long time to charge
To discuss the impact of mobile phone charging speed, we first need to understand how to calculate the charging time. The charging time can be calculated by a simple formula: charging time = coefficient (generally greater than 1) & times; battery capacity (MAH) / charging current (MA). That is, when the charging current is fixed, the larger the battery capacity is, the longer the charging time is; when the battery capacity is fixed, the larger the charging current is, the longer the charging time is.
Thus, in order to meet the needs of people using mobile phones for a long time, when the charging current remains unchanged, manufacturers increase the capacity of mobile phones, and people have to charge their devices for a longer time.
In addition, in actual work, the current is determined according to the load (that is, the mobile phone) connected behind. As long as within the scope of our ability, how much current the mobile phone needs, how much current the charger can provide. If the mobile phone needs more current than the charger can provide, the charger will always output the maximum current. So when the battery capacity is the same, the more current the mobile phone can carry, the faster the charging time will be.
The charging specification of the power adapter affects the charging speed
At present, the standard chargers of most brands of mobile phones are standard 5V, but manufacturers generally equip different output current according to the battery capacity. Someone once compared that if the voltage is the same, the difference between 0.5A, 1a and 2A chargers is like a single lane, two lane and four lane Expressway - every time the current doubles, the charge will double in the same time. Therefore, when charging the iPad with the iPhone charger with the maximum output current of 1A or the original charger with 2a, the charging time of the former is 2.1 times of the latter under theoretical conditions.
Therefore, when charging the mobile phone, in order to ensure that the charging speed of the mobile phone is fast enough, we should try to choose the original charger or other brand charger whose output current is not lower than the original standard.
Poor data cable is the killer of slowing down charging time
It is difficult for ordinary people to distinguish the differences between data lines from their appearance. Therefore, it is common to mix the same interfaces. However, the number of currents provided by different data lines may be different.
It's a lot of thin and thick wires, but it's replaced by copper wires. In addition, there may be hidden dangers in the contact material and welding of poor quality data line connector. The above problems will lead to increased resistance. The standard data line resistance should be 0.5 ohm, while the poor quality line may reach 3-6 ohm, and the charging efficiency will naturally drop by 6-12 times.
Easily neglected weather factors
Many people have the experience that mobile phones are often unable to charge in the cold winter. This may not be the problem of mobile phones, but the temperature is too low. Because most of the lithium batteries used in smart phones are equipped with a low temperature protection mechanism, the low temperature will lead to the deposition of lithium in the lithium battery, which will no longer react with the material, and then lead to the internal short circuit of the battery. At this time, it will be unable to charge or the charging speed will be very slow. This problem also occurs when the temperature is too high.
Apple says the iPhone charges most efficiently at room temperature of 22 ℃. The same is true for Android phones that use lithium batteries. When the temperature is too low, we need to transfer the device to a warmer environment. When the temperature of the lithium battery exceeds the threshold value of low temperature protection (iPad, laptop, etc. is generally 5 ℃, mobile phone is generally about 0 ℃), it can be charged normally. When charging, the mobile phone is seriously hot. You can remove the shell of the mobile phone or put it on a cold desktop to cool down to improve the charging speed. Therefore, the temperature is a more important external factor affecting the charging of mobile phones, and the appropriate temperature helps to improve the charging speed.
The correct charging technique can help to improve the charging rate
When the power of lithium battery is very low, the protection of lithium battery will be activated. At this time, the mobile phone can not be turned on, and there is no response at the initial stage of charging, and the charging time will be longer. It takes a long time for a charged mobile phone to wake up the battery and turn off the protection function. So try not to wait until the battery runs out before thinking about charging.
As we all know, after the mobile phone is turned on, all kinds of programs are running all the time, which will consume more power and naturally delay the 'charging rate'. So when charging, try to turn off some apps and turn off the phone screen. Of course, if you can turn off the power or switch it to 'flight mode', you can save more power and charge faster. But for most people, it's unrealistic to completely cut off contact with the outside world for charging.
In addition, some friends like to charge through the USB interface of the computer, which takes a longer time to charge than plug in the socket. Generally, the maximum output current of the front USB port of the computer is only 0.5A, and the charging speed is very slow. If you have to use the computer USB interface to charge, you can use the computer rear USB port, because its current is more stable than the front port, and the charging speed is relatively fast.