With the continuous development and rapid upgrading of smart phones, the frequency of mobile phone replacement has become increasingly high, and the replacement of mobile phone data cable has also become frequent. Data cable has become a kind of "fast consumer goods". But after using the data line for a period of time, it will be found that it is not bad contact, joint cracking, or unable to charge. So how to choose a data cable?
NO.1. Classification and material of data line
1. Currently, there are three types of mobile phone data cable interfaces on the market: Micro USB interface, Type-C interface and Lightning interface.
Micro USB: It is an Android port, a trapezoidal interface. Generally, old Android phones use this kind of data cable, but it is less and less suitable for mobile phones now.
Type-C port: Flat circular port, fast charging speed.
Lightning connector: Mainly for iphones.
2. Data cable material can be divided into PVC material, TPE material and woven material.
PVC: is a common material, non-flammable, itself has a high smoothness, but after a long time, it is easy to burst and break the phenomenon of durability is poor.
TPE: thermoplasticity, flexibility and elasticity will be better, environmental protection and flame retardant. Many original data lines are made of TPE material.
Woven material: On the basis of TPE, add a layer of woven thread, mostly made of nylon material, wear-resistant, durable, crease resistant, good tensile resistance.
NO.2 Common data line damage reasons
1. The outer skin is damaged. Generally in the terminal head and tail position, because long-term bending use leads to deformation, this phenomenon will occur. From the safety point of view, the USB cable itself is low voltage, skin damage will not bring electric shock and other dangers, but it will affect the appearance. If the plastic is relatively hard, it can cut the skin, and if it's badly damaged, it can't be recharged.
2. Shell loose. The data cable only uses glue on the terminal head cover, which may cause the shell to loose after long-term use.
3. The wire core is broken. Unexpected forces, pulling, and so on can cause internal cable breakage.
4. Short circuit of internal solder joint. The PCB size of the terminal head of the data line is very small, less than the size of a large fingernail. If multiple data lines need to be welded in such a small position, it may cause the core shift and short circuit after long-term use, or even cause the burning of the equipment. Generally after welding using glue dropping technology can play an effective isolation.
5. Weave loose yarn for outer skin. In order to make the data line have a higher durability, many manufacturers will use the braided layer as the data line skin protection layer, avoid endothelial wear. The difference of weaving technology and the material of silk thread is very different, resulting in some poor quality braided thread is very serious. Some will be mixed with asbestos layer, skin sensitive, contact will be red itching.
6. Dark hair. When the data line is used in a bad environment, the contact of the data line will be polluted due to moisture, dust or sweat, and the phenomenon of electrochemical corrosion and oxidation will occur, which will increase the contact resistance and eventually lead to the unusable data line
7. In addition to the problems of the data lines themselves, human improper use can also affect the life of the data lines. For example, inappropriate plugging, random pulling, improper placement of data wires, data wires falling on the ground and trampled on.
NO.3 mobile phone data line detection standards
For the much-loved Type-C cable, the UL 9990 standard focuses on product safety. The main test items are: VW-1 flame test, 12mm flame test, power cord tension test, bending test, normal temperature test, insulation voltage test, fault current test, etc. Let's briefly describe a few of these test items.
1. Power cable tension test: a 40N force is gradually applied to the wire for one minute. During and after the test, the displacement of the cable relative to the connector should not exceed 1mm.
2. Bend test, test Angle 90 degrees, 10 bending cycles per minute, test at least 200 bending cycles, after the test, no stress or damage on the internal connection, the conductor can not be broken.
3. For normal temperature test, the test current is the maximum rated current of the cable. After normal operation and reaching the thermal balance, the temperature rise of the connector and any location under test shall not exceed 30 degrees of the ambient temperature.
NO.4 Shopping guide
1. Whether to support fast charging? There are 50W and 66W fast charging cables on the market, which can be selected according to their own needs.
2. Looking at the material, the current durable data line is nylon woven material. On the basis of TPE, a layer of woven wire is added to protect it. When choosing to see whether the weaving part is fine and fine.
3. Look at the joint, which is the connection between the wire body and the joint. This place is particularly easy to break. The reinforcement of this place will play a good role in the protection of data lines.
4. Choose the length. Theoretically, if the length of the data line is too long, the resistance will increase, which will affect the charging speed. If there is no special requirement, it is appropriate to choose the data cable with a shorter length.
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