What are the disadvantages of using the USB port directly on the car?

What is certain is: no harm! The USB interface on the car is installed for the use of personnel on the car.

If you have to say bad maybe the charging speed is not ideal. The reason is that today's new cars, specific to each car, each USB socket, although the interface is the same, but the design purpose may be different.

There are two types of specific car USB:

The first kind, marked with USB, or USB, mobile phone symbol, or USB mp3, this USB seat is connected to the USB communication or decoding chip on the car player, which is used to allow the car player to read external USB devices, such as U disks, mobile phones, etc. The function is somewhat similar to the USB port on the computer, when the phone is connected to this USB port, the charging speed will be very slow. Because all phones don't charge at high current in this mode. (Of course, generally this type of USB can not provide more than 500mA charging current.)

The other is the USB interface designed for mobile phone charging, which generally has the word CHARGER or lightning symbol. Some cars will have three or four, and some seats will be placed near the rear air outlet for easy use by rear passengers. This kind of charging USB interface, generally can provide a large charging current, unfortunately, because today's mobile phone charging protocol is inconsistent, resulting in individual mobile phones in these car compatibility is poor on the charging interface may not be able to fast charge.

Here is a talk about the on-board chargers of the cigarette lighter type on the market, because they are more focused on the research and development of mobile phone chargers, they generally use the latest (or most cost-effective) charging chip (or charging protocol chip), these new chips can detect the type of mobile phone currently connected, so as to provide the appropriate charging protocol and the charging management chip communication on the mobile phone, so that the mobile phone, the mobile phone, the mobile phone, the mobile phone, and the mobile phone. Chargers are open fast charging mode, so that the phone charging speed to reach the fastest.

Specifically, we can install some mobile phone apps (I use Ampere for charging evaluation) to check the charging speed of the USB charging port of our phone in the car. The specific current value may not be accurate, but the comparison will know the difference. We generally use it to compare the charging current value of the supporting original mobile phone charging head to evaluate the charging speed of other charging sources (car USB).

After starting the car, wait a while before charging! Don't leave it on! Take your phone and start the car! The result is burning your phone. I've been there! [facepalm][facepalm][facepalm]

What's the harm?

The quality of the things in the car is much higher than the quality of the counterfeit cigarette lighter charging head you buy

Now most of the cars will have a USB interface, including me often in the long-distance process with these interfaces to charge the phone, but in theory, the direct use of the car USB interface to charge the phone can be emergency, but it is best not to do so often, let alone become a habit.

Car USB interface and USB interface on the computer in the power supply stability is different, many cars USB port power supply is unstable, unstable means that the voltage is not necessarily 5V, USB specifications require USB interface voltage is 5V, but most cars USB interface can not be stable on 5V, voltage instability has little impact on data transmission, However, it has a greater impact on charging equipment, which may cause wear and tear to the mobile phone battery in the long run and reduce its life.

There are also some car USB interface voltage is insufficient, less than 5V will not be charged, higher than 5V May cause an explosion, although the mobile phone has a protection circuit, but if the long-term use of such USB interface charging, not only to the battery, may cause damage to the entire mobile phone motherboard.

So the car USB interface can be used to charge, but it is not recommended to use it for a long time. The USB port on the car can be connected to the device to transmit data, but it is still not reliable for charging, long-term use will be risky, and most of the current USB interface of the car is quite low, it is too slow to charge.

This is a design to increase convenience, the harm is minimal, as long as the advantages outweigh the disadvantages that reflects his value

In fact, this problem is too much to consider, the USB interface on the car is not to use it? There is really no harm in direct use, the advantage is to bring convenience to the car, after all, the essence of the car is to serve people and increase the convenience of life, and the USB interface is used directly when needed. Now the USB interface on the car is mainly two categories, one is used to transmit data, such as listening to music with U disk, mobile phone Internet data connection, etc., the second category is the charging port, charging the mobile phone, driving recorder connection, etc., if the data port is used to charge the mobile phone, the charging speed will be relatively slow due to the relatively small current, but it can also be used. When needed, such as when the mobile phone is out of power, it is directly used to charge it, and in some cases must be used, such as the car recorder to connect, really there is no harm, if you have to carp that it will increase the current in the car, thus affecting the battery and other components, then consider it, the whole car can not open. If increasing the current in the car is not good for the battery, all the electrical equipment in the car will be like this, such as lights, center control screen, audio, etc., is it because it is not good for the battery? And the engine start, spark plug need electricity, the battery after a few years of failure is normal, after all, this is also a wearing part, so there are some things in the car do not need to consider too much, similar to what fuel plus half a tank more fuel efficient, automatic stop must first hang N stop then handle the brake or turn off, otherwise how how, do so much really good for the car? There is no need to exaggerate something in order to attract attention. In summary, since the car is designed with a USB interface, it is used directly when needed, even if there is a problem, the manufacturer engineer has long considered it, and gave the corresponding solution, if there is a real fault that belongs to the quality problem of individual models, there are some other functions, there is a corresponding demand for direct use, A car with real problems won't stand the test of the market.

I hope the above analysis can be helpful to everyone!

In a car, the USB interface may be in the central dashboard, it may be in the glove box, it may be in the middle of the console. We all use it naturally to charge our phones, but is it really the right thing to do? For one thing, they don't charge as fast. You want fast charging, then these ports are not able to meet. Because they can't provide much voltage to charge a current cell phone. For example, to charge a tablet or other entertainment device, we tested the voltage and current of USB in many cars. All they did was provide a weak 0.5A output. Such a voltage can only drive an MP3, and he hardly has enough electricity to maintain the normal use of a mobile phone. So, is there no solution? First, we want to place in the car, there is a usb port, to make use of the car's 12 volt power supply, and some universal chargers. Most 12 volt power supplies, ports, rated at least 10A, a qualified USB car charger, can provide a very good charging device port.

Many owners will have a charging line in the car, and sometimes the phone can be plugged into the car USB interface to charge the phone, in fact, there is a misunderstanding, not all USB interfaces are suitable for charging the phone.

Most of the cars have data ports

USB is actually a data transmission specification, the interface has a total of four contacts, two of which are power supply and the other two are used for data transmission. When the phone data cable is connected to the computer, it is data transmission mode, and all four contacts are used. After plugging in the charger, only the power supply contact is used to charge the phone. The USB interface on the car is generally the data interface of the player, and the car audio system can play the files in the USB disk after plugging in the USB disk.

The data transfer interface is not suitable for charging

USB interface power supply voltage is 5V, this voltage can meet the mobile phone charging, but its output current is generally only 500ma, and the ordinary mobile phone charger output current is about 2A, is several times the USB interface, which leads to a very slow charging speed, sometimes open navigation power even does not rise and fall. And the use of vehicle data interface charging for a long time may cause the interface to overheat and burn out.

How do I charge my phone in the car

There are many ways to charge the car, some cars come with 5V power supply, and the shape is also a USB interface, but the charging current fully meets the needs, and the same effect as the charger. You can also use the inverter to raise the voltage to the mains voltage and then plug the charger directly to charge, but this method is a little troublesome. The easiest way is to buy a reliable car charger and plug it into the cigarette lighter, because the cigarette lighter insurance is basically 15-20A, with a high carrying capacity, which can fully meet the charging needs and will not burn the cigarette lighter insurance.

In fact, it is the same principle as the charging treasure, which is very harmful to the battery, and should be used with caution