I believe many people have this feeling. After the phone is charged with USB, the power drops very quickly.
Why is the phone significantly powered down after being charged by the computer USB? The answer is simple, because you may not be full at all! The USB output voltage of the computer is 5V, which is generally very accurate. The reason why everyone feels that USB is not full is because the USB output current is small, and the last stage of charging requires trickle charging. Trickle charging is used to compensate for the loss of capacity due to self-discharge after the battery is fully charged. After the battery is fully charged, the capacity lost due to self-discharge is approximately 5% of the nominal capacity.
In theory, the trickle charge is at the level of 1/500 of the charging current. The USB current is only 500mA. The turbulence is too small, so the process is slow and slow, and the small partners usually pull the line out in advance. The result is 5% of the power is gone, even if the phone shows 100% of the power, this is just an algorithmic problem with the battery.
▌ Simple questions are simple and easy to answer. The following is the expansion stage. ▌
The principle of mobile phone charging At present, almost all mobile phones use lithium batteries. From the point of view of the charging method, the charging mode of the lithium battery is a voltage-limiting constant current, which is controlled by the IC chip. Specifically, the voltage of the battery to be charged is first detected. If the voltage is lower than 3V, the mobile phone will be pre-charged first. The charging current is 1/10 of the set current. When the voltage rises to 3V, the phone will enter the standard charging process.
The standard charging process is: constant current charging with set current. When the battery voltage rises to 4.20V, the mobile phone will be changed to constant voltage charging, and the charging voltage will be 4.20V. At this time, the charging current will gradually decrease, and when the current drops to 1/10 of the set charging current, the charging will be completely completed.
Is it safe to charge the phone with a computer USB?
Have children's shoes found that many mobile phones use computer USB charging will have leakage problems? In fact, this is not the case. The lithium battery of mobile digital products has a protection board that limits the minimum voltage and limits the charging current. And now the mobile phone whether it is using a charger or a computer USB, confession, you have to go that USB cable, what to charge, only the difference in charging current, the other end of the line, as long as there is no contact power problem, The difference between a regular power supply and a computer USB is only at the speed of charging.
I remember that some media partners have tested before, using the laptop's USB to charge the phone. Compared with the original charger charging the phone, the charging voltage is slightly higher, about 5V and 4.2V before and after, and the charging current is slightly lower. The front and rear are about 190mA and 220mA, but for the USB of the desktop, the charging voltage is still 5V, and the charging current is increased to 230mA.
So you can conclude that using a computer USB to charge the phone and charging the phone with the original charger, the difference is only the difference in current, the charging speed is different, and has little to do with security, even during the charging process Mobile phone, your hand will have a numb feeling, it is just induction electricity, which has a certain relationship with the air humidity and the clothes you wear, similar to static electricity, if you really feel uncomfortable, then the solution is also very Simply put the host on the ground.
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