Difference between charging heads 1a and 2a

Mobile phone charging principle

Mobile phone charging principle The mobile phone charger is actually a low-voltage pulse that is converted from a 220V civilian rated voltage to a 5V low voltage pulse. This process involves a step-down, rectification, and stable voltage circuit, and finally becomes a 5V stable DC power.

Difference between charging heads 1a and 2a

Many of us will not know, in fact, the different charging lines have a great impact on the charging speed. For example, the longer the charging line, the lower the charging speed naturally; the charging line is 1a, and the speed can only reach half of the speed of about 2a. This is similar to a water pipe. The shorter the water pipe arrives, the shorter the water pipe is. The thicker the water pipe, the more water is poured.

What exactly is 1a and 2a? It is the current, similar to the food of electronic equipment. In the early batches of mobile phones and other electronic equipment can accommodate more than 1a, that is, even with 2a data line, but the charging speed is not much different from 1a, because the phone's adaptive charging current is less than 1a, which is A person's esophagus is only 1a, even if he is given 2a's physical object, he can only accept half. However, with the advancement of mobile phones, the current charging current of mobile phone devices has gradually exceeded 1a. For example, the original Samsung S4 mobile phone is equipped with 2a, which can be fully charged in about 150 minutes. For example, Apple 6/6plus charging current is also almost 2a, which more or less means 2a and fast charging trend.

Seeing here, you will clearly understand that the performance of the 2a charging data line is stronger than 1a, which can effectively increase the charging speed. Then there are similar reasons for our daily common chargers.

Charger 1a and 2a difference

Literally, the output current of the 2A charger is larger than 1A (A is the abbreviation of current unit ampere), and the higher the current, the faster the charging speed. As for the 2A charger, it will not hurt the battery of the mobile phone more than 1A, but it is not big, because the mobile phone battery design will generally consider these.

The output current of the charger is actually determined by the state of the load. For example, a charger output can reach 20A, but if the consumer's mobile phone charging logic control is only 2A, then the charging speed will not be affected within the actual charging current of only 2A. A good mobile phone charger will be designed with circuit protection. When the current is too large, the protection mechanism will be triggered in time to ensure consumer safety.

Charger internal structure

Can 1A charger and 2A be universal? Yes, in theory, for mobile phones, as long as the interface is plugged in, you can charge. The charger of 2A represents its maximum output charging current 2A, and the maximum output charging current of 1A is 1A, and the output current of the charger is related to the impedance of its rechargeable battery, instead of the 2A charger, it must output only 2A. The higher the current, the higher the temperature of the phone and charger will be, and it will feel slightly hot.

Then introduce the difference between the two, follow the small series to see how you should use the charger correctly? What is the usage and precautions of the charger? How to choose a good charger?

How to use the charger and the main functions

First, the charger use method

1. First check if the charger voltage and polarity match the battery.

2. Connect the positive pole N "+" of the charger to the positive pole N "+" of the battery; the negative pole L "-" is connected to the negative pole "-". (Polarity error will not affect the battery, but will burn the charger.) The charger's power plug is connected to the power supply.

3. The red indicator light is on, indicating that the power supply is connected, and the high current charging is in progress; the red and green indicators are flashing, indicating that 85% of the charging has been completed, and the automatic detection and adjustment of the charging voltage, current, and gap pulse width are being performed.

4. The red light is off and the green light is on, indicating that the charging is 95%, and the battery maintenance procedure has been entered. After one hour of maintenance, the battery is fully charged and the power can be removed. If you are not in a hurry, you can not unplug the power cord and have no effect on the battery.

Second, the main function

"The battery is not worn out, but it is damaged." Improper charging can seriously damage the battery and shorten the battery life. Before the 1990s, it was charged with an uncontrolled, unprotected rectifier. It was necessary to be guarded by people, and it was overcharged, drummed, and opened. After the 1990s, with the use of switching power supplies, there are gradually two-stage, three-stage charging methods of constant power, constant current, constant voltage and voltage limiting, which solve some of the problems in charging.

But the whole process of battery charging is an ever-changing process that can be solved in a few paragraphs. First, the concentration of sulfuric acid in the electrolyte is gradually increased, and the power that the battery can accept for charging is gradually reduced; the terminal voltage is gradually increased, the imaginary voltage is getting larger and larger, and the polarization phenomenon is more obvious later, and the electrochemical reaction speed is increasing. The slower, the higher the charging voltage, and the closer to the gassing point. Therefore, it is impossible to adapt to the above situation with a three-stage method. Simple constant power, constant voltage, high current, medium current, small current, negative pulse, and gap pulse cannot adapt to the changing conditions in the charging process.

The application of the computer chip completely solves these problems. It can dynamically detect and judge according to the external environment temperature and the internal condition of the battery during the charging process, and automatically control the charging process to achieve a fast and good purpose.

(A), high current constant power function

After deep discharge of the battery, the acceptable charging power is very large. When charging with a large current, it will not generate heat and gas, and the reverse negative pulse current will eliminate the polarization phenomenon of the battery, improve the charging acceptance of the battery, and achieve the purpose of fast charging. .

(B), high current pulse charging function

When the battery voltage is close to the micro-evaporation point, the charger automatically switches into the high-current gap pulse charging, which reduces the charging power, reduces heat generation, and improves battery acceptance. In this process, after the chip detects the voltage value of the gassing point, it will adaptively adjust the pulse width and the length of the gap time to prevent the battery from rising too high.

(C), pulse gap, current size adaptive charging function

When the battery voltage rises to another chemical conversion point, if the charging mode is not changed, the battery will be heated and lose water. The adaptive charging function will charge according to the condition of the battery according to the pulse power method with decreasing power consumption and increasing gap time, which can reduce the heat and water loss of the battery.

(4) Battery maintenance and repair function

When the battery terminal voltage reaches a certain value, the charger automatically switches to the high voltage and small current gap pulse charging mode, which can play the role of desulfurization and balanced charging. The capacity of the backward plate is improved, and the sulfide crystal is activated to repair. The role of the battery.

(5), floating charge function

Whether it is high-current charging or three-stage charging of ordinary chargers, they are not able to fully charge the battery 100%, only to 85%, up to 95%, while the floating charge function of Xianma can be After the charging depth reaches 95%, under the premise of keeping the battery terminal voltage not falling, the small current charging is continued to avoid undercharging.

The charger is based on an ambient temperature of 25 ° C, and the charging voltage is reduced by 3 mv / per division per degree when it rises by 1 ° C; 3 mv / per division per degree is increased for every 1 ° C reduction, so that summer is not overcharged, and winter is not undercharged.

( 7) Safety automatic protection function

1. The temperature of the charger is increased, and the charging power can be automatically reduced gradually until it is completely stopped. When the external interference is eliminated, it will continue to work; the interference will exist and it will be turned off again.

2. After the chip is out of control due to serious interference, the charger will automatically enter the safe mode to charge.

3. External short circuit, the charger can automatically stop the output current.

Charger use precautions

1. Don't call when you are in close contact.

In the state of charge, the insulation between the parts with dangerous voltage and the accessible conductive parts is broken or the contact current is too large, which is easy to cause electric shock to the user. It is a common practice for the little friends to make a phone call when the mobile phone and the charger are in close contact, so be careful. In addition, poor quality chargers are also easy to catch fire.

2, it is best to use direct contact

The original mobile phone charger is like a small power supply bureau. There are overvoltage protection lines and transformer devices, which can make the high voltage change to low voltage and the AC power to DC power. The universal universal chargers are mostly produced by informal manufacturers, without protective coils, which are easy to make voltage or current too high and unstable. Excessively high voltages tend to pack the battery, sometimes causing a dangerous explosion.

3, quality is the key

When purchasing a mobile phone charger, you must choose a qualified product from a regular manufacturer. Do not buy cheap products to an unqualified product. Fire experts pointed out that a good charger has a self-protection circuit for overheating. When its internal temperature reaches a certain value, it will automatically disconnect the power supply to a certain degree of protection.

4. Pay attention to ventilation and heat dissipation when "intimate contact"

When charging, the voltage of the mobile phone is higher than the standby state. If an unqualified battery or charger is used, and the environment is poor when charging, such as high temperature and humidity, accidents may occur, so please charge your partner in a place with good ventilation and heat dissipation. .

5, as much as possible to care when "intimate contact"

The mobile phone should try to choose someone to charge at the time, so that it can handle abnormal situations in time. During charging, pay attention to the temperature of the charger and the smell of burnt. If the temperature is too high, there is obvious hot hand or burnt smell, stop charging first, and then charge after checking the cause and necessary treatment.

6. Unplug after the event

After charging is finished, remember to unplug the power cord to prevent the power bus from causing a fire.

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