ESD基本原理和防护概要.ppt

Daily Measurement of ESD Protection ESD保护和每日测量 Wrist Strap testing 腕带的测试 ESD footwear testing 静电鞋的测试 Commonly-seen ESD Concerns常见的ESD关注事项 No wrist straps while handling chips or PCB boards 没有带腕带而直接处理贴片部品或电路板 Put PCB on static generating material, e.g. Styrofoam and bubble bag could generate static electricity easily 将PCB放在产生静电的材料，如泡沫和气泡袋非常容易 产生静电 Wrist strap not connecting to the grounding per ESD policy 腕带没有接地根据静电防护政策 Commonly-seen ESD Concerns常见的ESD关注事项 Document folder could generate static electricity 文件夹可能产生静电 Paper could be static dissipative with certain moisture, not good to put the PCB on cardboard (especially with tape) 带有一定水分的纸可能消耗静电，将 PCB放在纸板上不好（尤其还带有胶纸） Put PCB on non-conductive chair 把PCB放在绝缘的椅子上 Commonly-seen ESD Concerns常见的ESD关注事项 Not shielded while handling 处理时没有做屏蔽 The chain of mobile car is not grounded properly 移动推车的车链没有接地 Grounding is not secured 接地不安全 ESD Industry StandardESD行业标准 IEC 61000-4-2 Electrostatic Discharge Standards IEC 61000-4-2 静电放电标准 * * * * * * * * ? Intertek 2011, All Rights Reserved * ? Intertek 2011, All Rights Reserved * ? Intertek 2011, All Rights Reserved * ? Intertek 2011, All Rights Reserved * ? Intertek 2011, All Rights Reserved * ? Intertek 2011, All Rights Reserved * ? Intertek 2011, All Rights Reserved Electrostatic Discharge (ESD) Improvement静电放电(ESD)改进 ESD Generation 静电的产生 ESD is generated per the following: 静电产生于以下几点 Friction and Separation 摩擦和分离 Induction 感应 Capacitance Variation 容量变化 ESD Damage 静电的损害 Catastrophic failure 突变失效 When a component is damaged to the point where it is ‘dead’, and it will never function again. This is the easiest type of ESD damage to be detected during testing 当一个组件损坏到‘死’，它将永远不会再次运行。这是能够检测中的静电放电损伤的最简单的类型 Latent failure 潜在失效 ESD weakens or wounds the component to the point where it will still function properly during testing, but over time the wounded component will cause poor system performance and will even