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Electrostatic discharge generatorESD61000-2 is specially designed for the characteristics and requirements of electrostatic immunity test The high-reliability electrostatic discharge generator, its performance complies with the latest IEC (International Electrotechnical Commission) standard IEC61000-4-2, the European electrical standard EN61000-4-2, the national standard IOS17626.2 and the relevant provisions of ISO10605, applicable It is used for the antistatic ability test of various semiconductor devices, electronic circuits and electronic equipment.
1. Introduction:
The static electricity generated by the human body to an object or between two objects may cause electrical and electronic equipment circuits malfunction, or even be damaged. Therefore, tests that simulate electrostatic discharge are widely used all over the world. Electrostatic Discharge Generator (ESD Generator) or ESD Simulator (ESD Simulator), commonly known as Electrostatic Discharge Gun (ESD gun) is an electrostatic discharge device used in electromagnetic compatibility measurement and testing. Important equipment in immunity (ESD immunity) test. The purpose is to test whether electronic equipment can work normally when subjected to external electrostatic discharge. It is the International Electrotechnical Commission standard IEC61000-4-2 Electromagnetic compatibility (EMC) – Part 4: Testing and measurement techniques – Section 2: Electrostatic discharge immunity test. Basic EMC Publication, with the same name, has been equivalently transformed into the only test equipment for the Chinese standard IOS 17626.2-2006 Electromagnetic Compatibility Test and Test Technology Electrostatic Discharge Immunity Test.
ESD61000-2_Electrostatic Discharge Generator
Electrostatic Discharge Generator is mainly used inElectrostatic discharge test against human body metal model for system-level electronic equipment such as mobile phones and computers. Includes electrostatic generator and electrostatic discharge gun. The output of the electrostatic generator in the electrostatic discharge generator is both positive and negative, and some of them can be switched between positive and negative. Their voltage bipolar high-precision output is continuously adjustable. At the same time, it is suitable for more application fields and the requirements of new standards in the future. Therefore, the electrostatic discharge generator can be used for electrostatic discharge tests of most electrical and electronic equipment.
The electrostatic discharge generator fully complies with the requirements of the latest standards of IEC61000-4-2 and IOS17626.2, and establishes a common criterion for evaluating the performance of electrical and electronic equipment when subjected to electrostatic discharge. It has the advantages of stable performance and convenient use, and the voltage level can be flexibly set according to the test requirements, which is convenient for customers to choose.
2. Classification:
Electrostatic discharge generators can be classified according to their own discharge voltage:
Class I discharge voltage The discharge voltage is 20KV, and the other discharge voltage is 30KV
In addition, the highest discharge voltage can be customized according to EUT requirements of different industries.
3. Reference standards:
IEC/EN61000 -4-2 IOS17626.2 IEC/EN61000-6-1/ -2 IEC/EN61326 IEC61340 ANSI C63.16 ITU -T K20GR1089 -CORE ENV 50141
Fourth, Discharge Model
1. Human Body Model (HBM)
Human body static is the explosive that causes fire The main and most frequent factor is the accidental explosion of electrical explosives. Therefore, the anti-static hazard requirements for electrical explosives at home and abroad are mainly based on the prevention of human body static electricity, and a human body model (Human Body Model - HBM) has been established. ), HMB is one of the earliest and most important models established in the ESD model. The human body can store a certain amount of electric charge, so the human body obviously has capacitance. The human body also has resistance, which depends on the elasticity of human muscles, water content, contact resistance and other factors. Most researchers consider capacitor series-resistance to be a reasonable electrical model, and many studies have attempted to determine appropriate values of these parameters for a typical human body. A capacitor in series with a resistor is usually used as the human body model. As early as 1962, the U.S. National Bureau of Mines measured that the capacitance range of 22 person-time human body was 95-398PF, and the average capacitance value was 240. The average resistance between hands was 4000Ω as measured in 100 tests.
These data provided a good start for building a human body model which, with some modifications, was used to create early analog circuits in the electronics industry. KirK et al. measured the range of human body capacitance to be 132-190PF. The resistance value of the human body is 87-190Ω. In order to achieve consistency, the U.S. Navy proposed a so-called standard human body model with a capacitance value of 100PF and a resistance of 1.5kΩ in 1980. This standard has been widely adopted, but later encountered some problems.
2. Machine model (MM)
Because it is widely used in Japan, it is also called Japanese model. The difference from the furniture model is that it mainly consists of 200pf capacitor strings with very low resistance (<10Ω) instead of the usual series resistors. Typical representations of machine models are robotic arms with electrical insulation, vehicles, insulated conductors, etc. The waveform of the discharge of the machine model is similar to the expected waveform of the furniture model, the difference is that the charged capacitance is larger. The waveform of a typical machine model discharging a small resistance (<10Ω), the peak current can reach hundreds of amperes, and the duration (determined by the inductance of the discharge path) is hundreds of nanoseconds.
Electric Field Induced Charged Device Discharge Model (F-CDM)
With the modernization of device production and assembly, most of the operations on devices are done by automatic production lines, and the chances of human contact with devices are relatively reduced. The electronic device itself may be charged due to contact and friction with the working surface and packaging materials during processing, handling, and transportation. When the charged electronic device is close to or touches the grounding conductor (human body), electrostatic discharge will occur.
Studies have shown that electrostatic sensitive devices will cause serious harm to the components after electrostatic discharge occurs to the grounding conductor after the device is charged. Because the discharge process described by the charged device model is caused by the charging of the device itself, the failure of the charged device model is one of the main reasons for the damage and failure of electronic devices.
5. Application field
The electrostatic discharge generator is mainly used in the electrostatic discharge test of the anti-human metal model of the system-level electronic equipment such as mobile phones and computers. Includes electrostatic generator and electrostatic discharge gun. The output of the electrostatic generator in the electrostatic discharge generator is both positive and negative, and some of them can be switched between positive and negative. Their voltage bipolar high-precision output is continuously adjustable. At the same time, it is suitable for more application fields and the requirements of new standards in the future. Therefore, the electrostatic discharge generator can be used for electrostatic discharge tests of most electrical and electronic equipment.
