How many watts does a general mobile phone charger have?

Mobile phone charger is divided into input end and output end. In China, the input terminal voltage is 220W, which is the voltage at home. Generally, the output terminal starts from 5V, 800mA(0.8A) or 5V, 1A, which is the standard USB2.0 voltage and current output.

The power number is how many watts you said. According to the formula P = u I, the power can be calculated as 5Vx 1A= 5W. Actually, it's marked on your charger. Let me show you a photo.

The traditional output of 5V, 1A or 5V and 800mA can't meet the current charging demand of mobile phone battery capacity, so many mobile phone manufacturers have introduced fast charging schemes.

The so-called "fast charge" is to add a "chip" to the charger to identify the battery capacity of the mobile phone in real time and adjust the charging voltage and current. For example, when charging, the charger detects that the battery capacity of the mobile phone is 1% and the temperature is 8℃, so the charger immediately adjusts the output to 8V and 3A; After charging to 20% for a period of time, the battery temperature was detected to be 78℃, so the charger immediately adjusted the output to 12V, 2A (the wattage remained unchanged, but the current decreased, which could reduce heat generation and protect the battery); It's almost full by 90%. At this time, the adjusted output of the charger is 9V and1a; . Charge it to 96%, then adjust it to 5V,1a. This is the so-called "smart fast charging"-flexibly adjust the charger output according to the battery power and temperature, enable high-power charging when the battery power of the mobile phone is low and the temperature is low, and enable low-power charging when the battery power of the mobile phone is high and the temperature is high.

At present, there are only a few fast charging protocols on the market, such as QC2.0 and QC3.0 of Qualcomm, mCharge of Meizu (PE scheme of MediaTek), VOOC of OPPO, and the most frightening thing is Super released by Meizu at this year's MWC conference. MCharge (use 1 1V/5A? New high-voltage direct charging scheme, the highest power can reach 55W, and it can fully charge 3000mAh battery in 20 minutes).

They are all hand-punched according to personal understanding, and I hope to adopt them! Thank you very much