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What is the difference between different USB chargers

What is the difference between different USB chargers and chargers with different specifications? Can USB chargers be used together? Except for some brand-name counterfeit machines, the essential difference between the chargers that come with genuine mobile phones is not Too big, of course, generally speaking, the heavier and larger the charger, the more comprehensive the electronic components inside. Therefore, the heavier the charger, the better the quality. Of course, it's just generally speaking, not an absolute argument, so where are the specific differences? Let's take a look at the differences between different USB chargers.


What is the difference between different USB chargers?

In fact, the common mobile phone charger specifications on the market are: 5V-0.5A, 5V-1A, 5V-1.5A, 5V-2A, 5V-2.5A, and the most widely used on the market today is basically 5V-2A.

Briefly explain the digital meaning of mobile phone chargers:

First of all, the current national unified rated voltage is 220V. The mobile phone charger is equivalent to a small transformer. The high-voltage pulse of 220V is converted into 5V low-voltage pulse through the mobile phone charger, and then it is directly converted to 5V through the conversion and voltage stabilization of the charger. The direct current is the "constant voltage" function. And 2A means that the highest load power is "constant current" function.

If the load of the mobile phone is a 10 ohm resistor, then the output current should be I=U/R=5/10=0.5A, and if the load of the mobile phone is a 1 ohm resistor, then the output current should be I=U/R=5 /1=5A, and the maximum capacity of your charger is 2A, then it will be overloaded at this time. "Constant voltage" and "constant current" are actually simply understood as "voltage limiting" and "current limiting". The voltage means the conversion voltage is 5V, and the flow means the output current is 2A.

It's like a car can run up to 300km, but in actual use, first see if the road can make you bump up to 300, followed by whether the traffic jam ahead can make you reach that speed. In fact, the general charging power supply will have a margin. Taking 5V-2A as an example, the maximum margin of this power adapter may reach 2.4A. When the mobile phone is charged when there is no electricity, the output of this power supply may reach 2.4A, but if it is higher, it will cause The power adapter burns to protect the charging equipment. When the power of the charging device is gradually sufficient, the output current will slowly decrease.

When the mobile phone charger is plugged into the power supply and not charging, it will not generate current. When you use it, you don’t need to worry about getting an electric shock. The reason is that when the load is infinitely small and the resistance is infinite, the current I=U/ R=5/∞=0A, that is, there will be no current, so there is no need to worry about electric shock.



The above is the difference between different USB chargers. The role of the mobile phone charger is to convert high-voltage AC power into low-voltage DC power. The overall difference is not that big, the difference is the difference in the maximum output current. The charging speed of some mobile phones is based on the fast charging technology inside the mobile phone and the cooperation of the original power supply. When the unsuitable power supply is used to charge another mobile phone, it may cause slow charging due to high or low rated output. And the mobile phone cannot recognize the connected power of this charger and cannot turn on the fast charge mode.