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Dongguan puguo industrial co., LTD
Contact person: Wang Xinbin
Address: 8th Floor, Shun Hing Building, No.2, Lane 15, Shui Wai District, Houjie Village, Houjie Town, Dongguan City, Guangdong Province
[ESD] Inadvertently, you will personally destroy your own design circuit board - KAPOOR ion fan
The principle of static electricity generation
Friction, collision, peeling, flow electrification, jet charging, stirring and charging, such as roller movement, personnel walking, when the tanker drains, the solvent sprayed by the nozzle, the static electricity of the mixer is due to the contact separation between objects in different electrification sequence positions. Causes the phenomenon of positive and negative charges on the object to be out of balance.
When two substances with different dielectric coefficients are rubbed, the positive and negative polarity charges are accumulated on two objects, respectively: when two objects come in contact, one tends to attract electrons from the other, so the two will form different The charging potential.
Frictional electrification is a mechanical process that relies on the relative surface to move electricity. The amount of electricity delivered depends on the number of contacts, surface roughness, humidity, contact pressure, friction properties of the friction material, and relative movement speed.
Two charged objects also become static power. As far as the human body is concerned, the static electricity generated by the friction between the clothes and the skin is one of the main reasons for the body's electrification.
When the static power source is in contact with other objects, there is a flow of charge based on the principle of charge neutralization, and enough electric power is delivered to offset the voltage. During the transmission of this high-speed electricity, potential damage voltages, currents and electromagnetic fields will be generated, and objects will be destroyed in serious cases. This is the electrostatic discharge.
Electrostatic induction charging: CRT display capacitance changes the piezoelectric effect Electromagnetic radiation induction Electrostatic charges only exist on the surface of the object, not inside the object, and the charge in the insulator remains only in those regions where static electricity is generated, but not on the entire surface. Therefore, the insulator does not lose these charges after it is grounded. In contrast to insulators, the charge conductor loses its own charge when it is grounded.
If the conductor is momentarily grounded (for example, the object is touched by a person standing on the ground), then the charge that is away from the surface of the charged body is released and the conductor will be positively charged.
Definition of ESD
Electrostatic discharge: charge transfer due to the proximity or direct contact of objects with different electrostatic potentials (GB/T4365-1995)”
ESD can cause serious damage or misoperation of electronic devices. Are semiconductor experts and users of equipment thinking about ways to suppress ESD? Static electricity is a static charge. The generation of static electricity is due to the electrons under the action of external forces, from one object to another object or the polarization phenomenon caused by the influence of the external magnetic field? A kind of electric energy, is the positive charge and negative charge in the local range lose balance result.
Excess or insufficient static charge on the surface of the object.
Stay on the surface of the object.
Formed by the transfer of electrons or ions.
The harm of static electricity
Explosive fire, etc. in dangerous situations
Work requirements for precision equipment
Product performance and reliability
Anti-interference ability, affect product sales
Potential damage to the product
With the development of high technology, the consequences of static electricity have broken the boundaries of security issues.
The harm caused by electrostatic discharge is one of the direct causes of equipment malfunction, signal loss, and error codes in the fields of electronics, communications, aviation, and all applications of modern electronic equipment and instruments.
Electrostatic discharge currents may be coupled directly to the data lines, signal lines, control lines, etc. of the electronic devices. In this case, integrated circuits and special-purpose integrated circuits are affected by electrostatic discharge.
Before 1970, many static electricity problems were caused by people's lack of awareness of ESD. Even now, many people suspect that ESD will cause damage to electronic products. This is because most ESD damages occur below people's feelings, because the body's perceived voltage for electrostatic discharge is 3 KV, and many electronic components are damaged in hundreds of volts or even tens of volts. Usually, electronic devices are not damaged by ESD. Obviously, the components were mounted on the PCB and then tested. As a result, many problems occurred and the analysis was quite difficult.
Especially the potential damage, even if the use of precision instruments is difficult to measure its performance has changed significantly, so many electronic engineers and designers are skeptical of ESD, but in recent years the test proved that this potential damage after a definite time, the electronic product The reliability has dropped significantly.
ESD harm to products
The basic physical properties of static electricity are: attraction or repulsion, and there is a potential difference with the earth, and a discharge current will be generated.
Electrostatic adsorption of dust, reducing the insulation resistance of components (shortening the life).
Electrostatic discharge destroys and damages the component and does not work (complete destruction).
Electrostatic discharge Electric fields or currents generate heat, causing component damage (potential damage).
The electromagnetic field generated by electrostatic discharge has a large amplitude (up to several hundred volts/meter). The frequency spectrum is extremely wide (from several tens of megabytes to several thousand megabytes), causing interference or even damage to electronic products (electromagnetic interference). Device breakdown caused by ESD is electronic The most common and most serious electrostatic hazard in industry.
Characteristics of Electrostatic Damage to Electronic Products Concealment: The human body cannot directly sense static electricity unless electrostatic discharge occurs. The human body does not necessarily have the feeling of electric shock. This is because the electrostatic discharge voltage perceived by the human body is 2~3KV, so the static electricity is concealed.
Potentiality: The performance of some electronic components after electrostatic damage has not dropped significantly, but multiple accumulated discharges will cause internal damage to the device and cause hidden troubles. Therefore, electrostatic damage to the device is potential.
Randomness: Under what circumstances will electronic components suffer from electrostatic damage? It can be said that after a component is produced and until it is damaged, all processes are threatened by static electricity, and the generation of these static electricity is also random and the damage is also random.
Complexity: The analysis of the effectiveness of electrostatic discharge damage is time-consuming, time-consuming, and requires high technology because of the fine, fine, and tiny structural features of electronic products, and often requires the use of high-precision instruments such as scanning electron microscopes.
The main purpose of ESD protection
First, increase production (IncreasedYields)
Second, Cost Saving (Cost Saving)
Third, better product reliability (Better Product Reliability)
Fourth, product life is longer (ExtendedUsageLife)
ESD method introduction
1 Environmental Control
2 Personnel control
3 Packaging Material Control
4 Staff training
1. Grounding Grounding is to put static electricity into the earth through a line connection, which is the most direct and effective anti-static measure.
Commonly used grounding methods for conductors are: with anti-static wrist and work surface ground.
2. Electrostatic shielding Electrostatic sensitive elements may be exposed to static electricity during storage or transportation. Electrostatic shielding may weaken the influence of external static electricity on electronic components. The most common method is to use electrostatic shielding bags as protection.
3. Ion Neutralization Insulators are often prone to static electricity. Eliminating static electricity from insulators is not effective with grounding methods. The commonly used method is ion neutralization, which uses ion blowers and ion air guns in the working environment.
Dongguan Pu Guo Industrial Co., Ltd. Copyright
Address：Houjie town of Dongguan City Houjie Wai community water district fifteen Lane 2, Shun Hing Building 8 floor
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