【应用】Parker Chomerics为未来车载应用提供新型塑料屏蔽外壳方案
近年来,随着车载电子系统和无线通讯技术的爆炸性发展,人们对于车辆的概念正在悄然发生变化。汽车已经不仅仅是一种交通运输工具,而是成为了媒体中心、通讯中心、办公室甚至家庭起居的延伸部分,将要发挥越来越多的功能和作用。
在汽车行业过去的一百多年历史中,电子系统以及防电磁干扰概念,与汽车的关联并不多。无非就是FM、AM收音机和一些电子数据面板,即使增加了遥控钥匙、自动门窗、电子踏板等装置后,需要考虑电磁干扰的设备,也就集中在中央控制器附近,况且那个时代的电磁干扰信号其实并不多。于是,在应对防电磁干扰需求时,采用一个小型的轻金属外壳方案,已经是一个非常不错的解决方案,例如大众和通用都曾经采用过的铝质中控盒方案。
然而,在电子科技飞速发展的今天,越来越多的自动驾驶技术进入了汽车行业,例如ADAS驾驶辅助系统、高速公路自动驾驶系统等等。同时,通讯技术也正在进入最新的5G时代,车载系统将要面临的不仅是更高的信号频率问题,而且还要应对车内增加的各种无线通信系统。而且,减重减耗、节能环保,永远都是汽车行业所要遵循的设计理念。因此,从多方面考虑,老式的轻金属外壳屏蔽方案,早已完全不能适应当今的车载应用需求。派克固美丽公司作为行业中的领先企业,在许多年前就已经预见了这种科技发展带来的新型需求。经过多年努力研究,终于开发出了一种非常适合车载应用的导电塑料产品PREMIER™ PBT-225,是金属铸件外壳的完美替代产品。
图1 PREMIER™ PBT-225导电塑料颗粒和成型的电子模块外壳
图2中所示的就是PREMIER™ PBT-225塑料颗粒实物,及其制成的电子模块屏蔽外壳产品。该型号塑料颗粒填充有均匀的导电填料,并且混合了不锈钢纤维和玻璃纤维,其成品外壳的屏蔽效能高达80dB(电磁安防标准),机械强度也十分优秀,各方面性能都不输给金属外壳。另外,PBT-225具有出色的抗水解性,提高了在湿热条件下的老化性能,弥补了塑料外壳的最大短板。在实际应用中,塑料粒子可以通过塑模等方式加工成更加复杂的壳体结构,比金属铸模的方式要简单得多,而且易修改易加工,灵活性和适应性都要强很多。最后,还有一个不能忽视的优点,就是塑料外壳的质量比金属外壳轻很多,即使与铝质外壳相比,也能减轻大约30%的重量,这对车载系统中越来越多的电子模块和电子系统来讲,具有重大意义。事实上,有很多整车厂和汽配商在十多年前,就开始尝试采用导电塑料作为电子模块外壳的原材料,经过这么多年的实际应用以及技术发展,相信这种应用方案已经趋于成熟,是未来车载应用的最佳解决方案。
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Parker Chomerics(派克固美丽)CHOFORM®和ParPHorm®系列EMI屏蔽垫片选型指南
目录- EMI Gaskets ParPHorm and CHOFORM Sealing Compounds CHOFORM Shielded Housing Assemblies
型号- PARPHORM L1938,CHOFORM 5560,19-26-5560-0500,PARPHORM S1945,CHOFORM 5541,19-26-1938-0200,CHOFORM®5541,PARPHORM® 1800,CHOFORM®5560,PARPHORM®1800,19-26-5528-0850,PARPHORM®L1938-45,CHOFORM® 5528,CHOFORM® 5526,PARPHORM® L1938-45,CHOFORM® 5575,19-26-5526-0850,CHOFORM 5528,CHOFORM® 5550,PARPHORM 1800,CHOFORM 5526,CHOFORM®5538,PARPHORM® S1945-25,CHOFORM®5513,PARPHORM®S1945-25,19-26-5550-0575,CHOFORM®5575,CHOFORM®5550,19-26-1800-0345,CCHOFORM 5550,19-26-5575-0240,CHOFORM® 5538,19-26-5538-0650,CHOFORM® 5513,19-26-5541-0650,19-26-5575-0500,CHOFORM® 5541,CHOFORM® 5560,CHOFORM®5528,CHOFORM 5513,19-26-1945-0250,CHOFORM 5538,CHOFORM®5526,CHOFORM 5575,19-26-5513-0850
PREMIER™ PBT-250-FR ELECTRICALLY CONDUCTIVE FLAME RETARDANT (FR) POLYBUTYLENE TEREPHTHALATE (PBT) PLASTIC
型号- PBT-250-FR,PREMIER™ PBT-250-FR,PREMIER PBT-250-FR
Parker Chomerics 产品概述
型号- CHO-TOUCH™,CHO-STRAP®,CHO-SEAL®,STREAMSHIELD OMNI-CELL® SHIELD-CELL,T-WING®,CHO-MUTE®,CHO-MASK®,SPRING-LINE®,DURALAN™,CHO-BOND®,CHO-FAB®,THERM-A-GAP™,WIN-SHIELD®,CHO-SORB®,THERM-A-FORM™,CHO-THERM®,THERMFLOW®,CHO-SHRINK®,THERMATTACH®,METALASTIC®,PREMIER™,CHO-FOIL®,CHO-LUBE,SOFT-SHIELD®,CHO-FORM®,POLA®,TECKFILM™,CHO-SHIELD®
【选型】适用于EMP防护应用的屏蔽材料类型:金属指形簧片、金属编织网、金属箔胶带、导电塑料
本文谈到的是以防EMP破坏应用为重点的产品,先简单讲一下什么是EMP,以及防EMP产品的特点。从EMP的特性出发,显然需要的就是能够在短时间内快速导出大量电磁能量的产品,并且屏蔽效能要足够高,能够衰减绝大部分的电磁能量。因此,这种EMP应用通常选择的是金属材料制品,同时保证大载流量、高屏蔽效能和高导电性能。笔者从派克固美丽产品库中,筛选了几个适用于EMP防护应用的产品类型。
器件选型 发布时间 : 2019-06-22
Speeding Development. Reducing Risk. Electromagnetic Interference (EMI) Shielding and Thermal Interface Materials Solutions for Life Science Devices
型号- PREMIER™ A240-FRHF,WIN-SHIELD™ P,SOFT-SHIELD® 4850,CHO-SEAL® 1285,PREMIER™ PEI 140,THERM-A-GAP™ GEL 30,CHOFORM® 5528,CHO-SHIELD® 2040,PREMIER™ A220-HT,THERM-A-GAP™ 974,CHO-SHIELD® 2044,CHO-SEAL® 6370,THERM-A-GAP™ 976,THERM-A-GAP™ 579,WIN-SHIELD™ G,THERM-A-GAP™ GEL 8010,THERM-A-GAP™ HCS10,CHO-SEAL® S6305,DURALAN™ P,CHO-SEAL® 1298,CHO-SEAL® 6502,THERM-A-GAP™ GEL 45,THERM-A-GAP™ G974,THERM-A-FORM™ T646,CHOFORM® 5513,CHO-SHIELD® 2056,THERM-A-FORM™ T647,CHO-SEAL® 6503,PREMIER™ A240-ST,THERM-A-GAP™ TC50,THERM-A-GAP™ 569,PREMIER™ PBT-225,SOFT-SHIELD® 3500,THERM-A-FORM™ 1641,SOFT-SHIELD® 3700
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加工尺寸范围2~15英寸,产品有效加工尺寸:半断加工:2MM*600MM*900MM;全断加工:30MM*1600MM*2500MM;
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