What are the characteristics of lithium battery fast charging technology?

In the absence of a breakthrough in cell phone battery technology, fast charging is so important to mobile phones that even mobile phones that do not support fast charging are embarrassed to call themselves flagships. So, what are the differences between the fast charging technologies on the market? What are the characteristics of the fast charging technologies of various manufacturers? In the second half of 2015, models generally adopted fast charging technologies. Generally speaking, I think charging more than 10W (ie 5V2A) is fast charging. First, briefly analyze the evolution of mobile phone charging: At the beginning, the battery of the mobile phone was not large. At this time, the default USB interface 5V0.5a can meet the charging demand; but after the emergence of smart phones, due to the great desire for performance, power consumption increased, 0.5a can not meet the demand; meaning an enhanced USB charging identification standard: BC1 .2. The charging current can reach 5V1.5a. However, around 2013, smart phones with more than 3000 mA appeared. At this time, even 5V1.5a cannot meet the demand, so it is expanded to 5V2A again. Common sense 1: The charging current is controlled by the mobile phone, not the charger. In other words, the mobile phone is a dam, and the charger is just a reservoir. The mobile phone will intelligently detect the load capacity of the charger. If the charger is of high power and good quality, the mobile phone will allow the charger to load a higher current. If the output current of the charger is too low, the mobile phone will also limit the current it can charge. This is why we choose high-power chargers. For example, mobile phones support 5V1.5a input. If you buy a 5V1A charger, the phone can only be charged with 5V1A. If you buy a 5V2A charging head, the phone will control the input current to only 1.5a, so the charger load is low and there is enough margin. Yes, I am talking about Apple. iPhone6/Plus has a high charging capacity of 5V1.5a/2A, but the stingy Apple standard charger is only 5V1A. The battery capacity of iPhone6 u200bu200bis more than 1800 mAh, but the battery capacity of iPhone 6Plus is close to 3000 mAh. In the actual test, the iPhone6Plus uses the iPad charger to charge 5V1.9a at the peak value. There is only one reason: cost savings. After all, Cook is a man who can make a lot of money. It is ridiculous for any fanatic to ignore this problem. At present, iPhone6S/6SPlus is likely to follow Apple's approach, because you can buy iPhone6S/6SPlus on facebook first, and then buy the iPad charger. Well, let's continue to talk about the history. In fact, 5V2A is what Qualcomm calls Fast Charge 1.0 technology. Of course, in fact, in order to prevent charger load, the general mobile phone is limited to about 5V1.8a. The charging technology of Android phone 5V2A has no restrictions, no identification protocol, anyone can use it. But Apple is an exception. The disgusting Apple lighting cable not only has the certification of the charger, but the Apple device detects that the non-original charger will limit the current to 5v/1 and 0.5. Apple has taken a very bad supervisor in its own interest to deliberately let the hardware certification And the software limitation, the universality of our equipment; Do not chatter about your fruits for safety reasons, inferior chargers, no matter what, the harm to you and the equipment is the same! There will be no difference between 5V2A and 1A. 5V1A’s fake Apple charging head is electrocuted and killed? So what is Qualcomm waiting for to wake up, it can make money like this? Therefore, the private agreement is now in place, which means that if you accidentally buy too many phones, you will have to Get several different charging heads! We all know that the key to increasing the charging speed is to increase the charging power. Power (W) u003d current X voltage. The charger first reduces the mains 220V to 5V and outputs it to the micro USB interface of the mobile phone. Then the internal circuit of the mobile phone stepped down to about 4.3v to charge the battery. Lowering blood pressure involves two processes. Previously, the output voltage of the charger was 5V. We are considering how to add current. But when it reaches 5V2A, the bottleneck comes: the further increase in current is bound to flood a large number of micro USB ports and data lines. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete.