Use the USB port on the car to charge the mobile phone, but the less it is, the old driver: Can't use it directly

Some car owners often encounter such problems when charging the USB interface on the car: it is clear that the mobile phone is being charged, but the power is still declining. What has actually happened? If you encounter this situation, it means that you use the wrong interface.

1. Types of car USB interface

There are two main types of USB interfaces on cars, one is the data interface, and the other is the power supply interface.

Data interface

The data interface is a car multimedia system, which is mainly used to plug in the game to play music. The USB interface on the computer case is the same nature.

Such interface power supply capacity is relatively weak, and the maximum current is only 500 mAh. It is not a problem for the previous old mobile phones, because the charging current of those mobile phones is about 300 mAh, which is completely enough. But today's smart machine charging current is the minimum of 1,000 mAh, which is obviously not enough.

Power supply interface

In recent years, many cars have been equipped with a USB interface with power supply. This interface is specifically responsible for charging. You can use it as the interface of the charger. If you insert it, there is electricity, and the power is sufficient, which can fully meet the mobile phone charging needs.

This interface is essentially a power supply. The reason why it is designed as a USB interface is mainly to facilitate the charging cable.

2. Use the data interface to charge, it is best to choose "charging mode"

When you connect your phone to the data USB interface of the multimedia system, the control chip of the interface will send a signal to your mobile phone and require reading the mobile phone file. At this time, the mobile phone operating system will pop up the dialog box and ask if you want to transmit data or only charging.

At this time, we need to choose "only charging", because the system may enter the data transmission mode by default if you don't choose. At this time, the vehicle will start to read the file directory in your mobile phone memory. Resources, increase power consumption. In particular, some vehicle systems are relatively old, the processing speed is relatively slow, and there are many internal files of smartphones. It is easy to cause the vehicle to crash during the reading process. After selecting the charging mode, the system will stop the file read.

To sum up, the following is the following 4 points:

1. The maximum current of the USB interface of the data transmission type is only 500 mAh. For old -fashioned mobile phones, it is completely okay to charge, but the charging speed may not be guaranteed for smart phones with huge battery capacity.

2. The USB interface for power supply is specifically responsible for power supply. You can use it as a mobile phone charger, and it is not a problem to charge any mobile phone.

3. If you use a data USB interface to charge, you should choose "only charging" on your mobile phone.

4. If you do n’t have a special USB power supply interface on your car, you can buy a car charger, and you can provide sufficient charging current on the cigarette lighter.

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