The difference between fast charging and ordinary charging

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The difference between fast charging and ordinary charging;

As the name implies, fast charging means fast charging, which is only relative.

In the current era of mobile phones for the whole people, the 5v2a charging head is generally used as the standard for general charging. Of course, a few manufacturers think that 5v1a is standard charging.

9v2a: simply increase the voltage to realize fast charging to reduce charging time. As the standard of fast charging in mobile phone era, its power is 18W (Physics: power = current × voltage). 4.5v5a: this kind of fast charging technology is to increase the current to increase the fast charging speed, with the maximum power of 22.5w.

Difference between fast charging and ordinary charging experience:

The voltage of our home circuit is generally 220V, while for mobile phone charging, it needs to be reduced to the voltage of the charger through the charger, and then it needs to be reduced to the battery voltage through the second step in the mobile phone (generally reduced to 4.2V ~ 4.4V)

9v2a: this kind of fast charging is realized by increasing the voltage. In theory, the heat of the charger is smaller than that of the 4.5v5a charger. When the high-voltage fast charging is used for charging, the heat of the mobile phone is the largest. The chip inside the mobile phone will reduce the charging speed to alleviate the heat. 4.5v5a: this kind of fast charging may be the standard configuration of flagship machine in the future. This kind of fast charging speed is the fastest and the experience is relatively best. Because the voltage reduction amplitude of the charger is the largest, so the heating of the charger is relatively the largest. However, the internal secondary voltage reduction of the mobile phone is relatively small, so the heat of the mobile phone is the smallest when charging. 5v2a: this kind of charger is a little higher than 4.5v5a in heating when charging. But there is a lot of speed difference.

3. What are the impacts?

If the model supports a 9v2a charger, it uses a 5v2a charger for charging. The phone's heating and charging speed will decrease. It will not affect the life of its internal components if the model supports a 4.5v5a charger, but uses a 5v2a charger for charging. The heating will increase to a certain extent, and the charging speed will decrease to a large extent. In fact, when the 5v2a ordinary charging just appeared, it was also defined as fast charging. At that time, people thought that the charging speed was very fast. Why do you think it's so slow now?