《国际电子商情》数字版2010年8月刊 - (Page 36)

封面故事海上风电场将成主流趋势，并网瓶颈呼求智能电网由MOV(压敏电阻)和GDT MOV供应商有Littelfuse、应商主要有泰科电子、TDK过来的感应雷影响的电子设 (气体放电管)构成的组合防 TDK-EPC、泰科电子、合 EPC、DEHN、OBO、深备，如逆变器。这一般采用雷方案。目前业内主要的肥宇潜电气科技，GDT供圳槟城电子，深圳天顺和雷晟都是DEHN防雷器的代理商。不管是保护交流110V/ 220V开关电源还是48V直流开关电源，传统的防雷解决方法是：第一级防雷采用GDT，第二级防雷采用 MOV。 MOV为业界广泛采用的主要原因是有耐冲击电流大、响应时间快和成本低的优点，但众所周知，MOV 存在技术上至今无法突破的瓶颈，MOV在未受冲击前，具有较好的绝缘阻抗，即漏电流很低；但当遭受感应雷的冲击后，压敏电阻会劣化，导致绝缘阻抗下降，漏电流加大，随着外界的冲击加剧，这种漏电流会加大导致电路板烧坏甚至短路起火。目前业界采用二种方法来解决这一问题，一是将压敏电阻封壳，但这是一个治标不治本的方法，二是串入保险丝的方法，但这种方法会出现一个矛盾：如果为防止较小的漏电流而使用较小电流的保险丝，这时通流量也会降低，否则较大的雷击电流会烧坏小电流保险丝；如果为提高通流量而采用较大电流的保险丝，这时稍小的漏电流仍然会烧坏电路板 » 上接34页 Junior ad 157mm x 220mm 下接38页 » 36 国际电子商情 | 2010年8月 | www.esmchina.com http://www.burnon.com http://www.esmchina.com

Table of Contents for the Digital Edition of 《国际电子商情》数字版2010年8月刊

STC MCU Co Ltd
Digi-Key Corporation
STC MCU Co Ltd
STC MCU Co Ltd
STC MCU Co Ltd
Shanghai Yachuang Electronics Co Ltd
Zhejiang Jiakang Electronic Co Ltd
Texas Instruments HK Ltd
ZLG-MCU Development Co Ltd
Advanced Power Electronics Corp
Analog Devices
Shanghai Keter Polymer Material Co Ltd
A-Bright Industrial Co Ltd
DongGuan ShiLong HuaTong Electronic Co Ltd
National Semiconductor Hong Kong Ltd
SyncMOS Technologies Inc
SinoHub Inc
Excel Cell Electronic Co Ltd
Mitsumi Electric Co Ltd
Mitsumi Electric Co Ltd
Shenzhen Hi-Hone Electronics Co Ltd
Hong Kong Baite (Group) Electronic Co Ltd
BYD Company Limited
BYD Company Limited
Axelite Technology (Shenzhen) Co Ltd
International Rectifier
Burnon International Limited
Micrel Semiconductor
Jiangsu Skysoon Communication Co Ltd
Richardson Electronics
China Electronics Appliance Shenzhen Co Ltd
National Semiconductor Hong Kong Ltd
Conquer Electronics Co Ltd
Renesas Electronics
Wuhan P&S Information Technology Co Ltd
Intersil Corporation
Honestar Technologies Co Ltd
Cognex Asia Inc Shanghai Rep Office
Fuzetec Technology Co Ltd
Lampek Enterprise Development (HK) Limited
Chiphomer Technology (Shanghai) Limited
Shenzhen Mornsun Electronics Co Ltd
Xiamen Ningly Electronics Co Ltd
Digi-Key Corporation
OTAX
CviLux Corporation
Powertek Group Co Limited
Mueller Electric (Shanghai) Ltd
Xiamen Letdo Electron Co Ltd
Hong Kong Trade Development Council
BCD Semiconductor Manufacturing Limited
Emirates Sky Cargo
Fengbao Electronic Technology (Shanghai) Co Ltd
Innostor Technology Corporation
Yeebo LCD Ltd
Eyang Technology Development Co Ltd
Nanjing Shiheng Electronics Co Ltd
LPKF (Tianjin) Co Ltd
Nanjing AH Electronic Science & Technology Co Ltd
Up Teks Co Ltd
Beijing Rowa Beite Electronic Co Ltd
Honghu City Languang Electronics Co Ltd
Shenzhen Runsheng Electronics Co Ltd
Trantek Electronics Co Ltd
Beijing Times Creation Electronic Co Ltd
EnEcomponents.com
Wealth Metal Factory Ltd
Weltronics Imaging Technology Ltd
GangYuan Electric Co Ltd,
Shenzhen NanDao Electromachinery Co.,Ltd
Pro Systems
Qualtek Electronics Ltd
Mouser Electronics
Protronic Asia Limited
Walter Electronic Co Ltd
Beijing New Chuang Si Fang Electronic Co Ltd
Shenzhen Jiaweiyi Technology Limited
My Group (Asia) Limited
Asiacom Technology (HK) Ltd
Sino-Tech International Holdings Ltd
Sino-Tech International Holdings Ltd
Shenzhen Qiankun Industrial & Trading Development Co Ltd

《国际电子商情》数字版2010年8月刊