Sharing the knowledge of mobile phone ESD protection with everyone Sharing the knowledge of mobile phone ESD protection with everyone (transfer) News download recommendation report Recommend the article to friends to get points reward announcement: Forum red envelopes are sent for free and you will get 100 points. The electrostatic protection of all digital products is basically similar. The mobile phone is a very representative product. Here we focus on the problems that should be paid attention to in the structural design, PCB design, and circuit design of mobile phones, and put forward measures for electrostatic protection and improvement in mobile phone design. In addition, we focus on the formation mechanism of ESD and the harm to electronic products, and focus on the ESD problems in mobile phone design and protection and equipment improvement. Keywords: static electricity mobile phone ESD TVS static electricity is a natural phenomenon that people are very familiar with. Many functions of static electricity have been applied to military or civilian products, such as electrostatic dust removal, electrostatic spraying, electrostatic separation, electrostatic copying, etc. However, electrostatic discharge ESD (Electro-StaticDischarge) has become a hazard to electronic products and equipment, causing functional disorders and even component damage of electronic products and equipment. The scale of modern semiconductor devices is getting larger and larger, and the working voltage is getting lower and lower, which has greatly increased the sensitivity of semiconductor devices to external electromagnetic interference. ESD has attracted more and more attention for the interference caused by circuits, the damage caused to components, CMOS circuits and interface circuits. ESD of electronic equipment has also begun to be written into national and international standards as an important part of electromagnetic compatibility testing. 1. Causes and hazards of static electricity Static electricity is formed when two materials with different dielectric constants rub against each other, and the positive and negative charges are accumulated on the two bodies respectively. When two objects are in contact, one tends to attract electrons from the other, so the two will form different charging potentials. As far as the human body is concerned, static electricity generated by the friction between clothes and skin is one of the main reasons for the human body to be charged. When the static electricity source comes into contact with other objects, the charge flows according to the physical existence of charge neutralization, and enough electricity is transmitted to offset the voltage. In the process of high-speed power transmission, potential destructive voltage, current and electromagnetic field will be generated, and in severe cases, the objects will be destroyed. This is electrostatic discharge. The national standard defines: electrostatic discharge is the charge transfer caused by the close proximity or direct contact of bodies with different electrostatic potentials (GB/T4365-1995), generally expressed as ESD. ESD can cause electronic devices...
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