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解析清洗PCB电路板的小技巧

大发快三PCBDIANLUBANZAIGUONEISHIYONGJIAODUO,ZAIYINZHIDIANLUBANZHIZAOGUOCHENGZHONGHUICHANSHENGWURANWU,BAOKUOHANJIHEJIAOZHANJIDECANLIUDENGZHIZAOGUOCHENGZHONGDEFENCHENHESUIPIANDENGWURANWU。RUGUOpcbBANBUNENGYOUXIAOBAOZHENGQINGJIEBIAOMIAN,ZEDIANZUHELOUDIANHUIDAOZHIpcbDIANLUBANSHIXIAO,CONGERYINGXIANGCHANPINDESHIYONGSHOUMING。YINCI,ZAIZHIZAOGUOCHENGZHONGQINGJIEpcbDIANLUBANSHIZHONGYAODEYIBU。

PCBA基板有哪些常用的类型?

大发快三PCBAJIBANSHIPCBAZHUBANDEZHUYAOZAITI,ZHIZUOPCBAJIBANDECAILIAOZHILIANGDUIZHENGGECHANPINDEZHENGTIXINGNENGYOUFEICHANGDADEYINGXIANG。PCBAJIBANDECAILIAOZHUYAOYOU94HB、94VO、22F、CEM-1、CEM-3、FR-4、LVJIBAN、FPCDENG,MUQIAN,FR-4、LVJIBANHEFPCZUIWEICHANGYONGDEPCBAJIBAN。

PCBA板与外壳之间的安规要求

大发快三ZAIYIXIEPUTONGDEJIADIANZHONG,PCBABANYUWAIQIAOZHIJIANDEJULICHANGHUIYOUYIDINGDEYAOQIU,QUEBAOCHANPINZAIGONGZUOSHIBUSHOUYINGXIANG。BENWENJIUWEIDAJIAJIESHAOPCBABANYUWAIQIAOZHIJIANDEANGUIYAOQIU。

PCBA板表面锡珠大小可接受标准

大发快三ZAIPCBAJIAGONGDEGUOCHENGZHONG,PCBABANDEBIAOMIANZONGHUIBUKEBIMIANDECANLIUYOUYIXIEXIZHU,XINGYENEIDOUHUIDUIPCBABANSHANGDEXIZHUDEDAXIAOHESHULIANGHUIYOUYIGEKEJIESHOUDEBIAOZHUN。YIXIAWEIPCBAWAIGUANJIANYANBIAOZHUN(JIANCHENGGUOBIAO)DUIPCBABIAOMIANXIZHUDEKEJIESHOUBIAOZHUN。

七大步骤教你确定PCB布局和布线——电路板设计技巧

作者:深圳市鑫诺捷电子有限公司 时间:2020-07-02 来源:鑫诺捷电子

大发快三       PCB(PrintedCircuitBoard),ZHONGWENMINGCHENGWEIYINZHIDIANLUBAN,YOUCHENGYINSHUADIANLUBAN、YINSHUAXIANLUBAN,SHIZHONGYAODEDIANZIBUJIAN,SHIDIANZIYUANQIJIANDEZHICHENGTI,SHIDIANZIYUANQIJIANDIANQILIANJIEDETIGONGZHE。YOUYUTASHICAIYONGDIANZIYINSHUASHUZHIZUODE,GUBEICHENGWEI"YINSHUA"DIANLUBAN。

SUIZHEPCBCHICUNYAOQIUYUELAIYUEXIAO,QIJIANMIDUYAOQIUYUELAIYUEGAO,PCBSHEJIDENANDUYEYUELAIYUEDA。大发快三JIANGRUHESHIXIANPCBGAODEBUTONGLVYIJISUODUANSHEJISHIJIAN,NEIME大发快三JIULAITANTANDUIPCBGUIHUA、BUJUHEBUXIANDESHEJIJIQIAO。ZAIGANGKAISHIBUXIANZHIQIANYINGGAIDUISHEJIJINXINGRENZHENDEFENXIYIJIDUIGONGJURUANJIANJINXINGRENZHENDESHEZHI,ZHEIHUISHISHEJIGENGJIAFUHEYAOQIU。

一、确定PCB的层数

       DIANLUBANCHICUNHEBUXIANCENGSHUXUYAOZAISHEJICHUQIQUEDING。BUXIANCENGDESHULIANGYIJICENGDIE(STack-up)FANGSHIHUIZHIJIEYINGXIANGDAOYINZHIXIANDEBUXIANHEZUKANG。BANDEDAXIAOYEYOUZHUYUQUEDINGCENGDIEFANGSHIHEYINZHIXIANKUANDU,SHIXIANQIWANGDESHEJIXIAOGUO。MUQIANDUOCENGBANZHIJIANDECHENGBENCHABIEHENXIAO,ZAIKAISHISHEJISHIZUIHAOCAIYONGJIAODUODEDIANLUCENGBINGSHIFUTONGJUNYUNFENBU。


二、设计规则和限制

       YAOXIANGSHUNLIWANCHENGBUXIANRENWU,BUXIANGONGJUXUYAOZAIZHENGQUEDEGUIZEHEXIANZHITIAOJIANXIAGONGZUO。YAODUISUOYOUTESHUYAOQIUDEXINHAOXIANJINXINGFENLEI,MEIGEXINHAOLEIDOUYINGGAIYOUYOUXIANJI,YOUXIANJIYUEGAO,GUIZEYEYUEYANGE。GUIZESHEJIYINZHIXIANKUANDU、GUOKONGDEZUIDASHULIANG、PINGXINGDU、XINHAOXIANZHIJIANDEXIANGHUYINGXIANGYIJICENGDEXIANZHI,ZHEIXIEGUIZEDUIBUXIANGONGJUDEXINGNENGYOUHENDAYINGXIANG。RENZHENKAOLVSHEJIYAOQIUSHICHENGGONGBUXIANDEZHONGYAOYIBU。



三、组件的布局


大发快三       ZAIZUIGAOJIYOUHUAZHUANGPEIGUOCHENGZHONG,KEZHIZAOXINGSHEJI(DFM)GUIZEHUIDUIZUJIANBUJUCHANSHENGXIANZHI。RUGUOZHUANGPEIBUMENYUNXUZUJIANYIDONG,KEYIDUIDIANLUSHIDANGYOUHUA,GENGBIANYUZIDONGBUXIAN。YINCISUODINGYIDEGUIZEHEYUESHUTIAOJIANHUIYINGXIANGBUJUSHEJI。ZIDONGBUXIANGONGJUYICIZHIHUIKAOLVYIGEXINHAO,TONGGUOSHEZHIBUXIANDEYUESHUTIAOJIANYIJISHEDINGKEBUXINHAOXIANDECENG,KEYISHIBUXIANGONGJUNENGXIANGSHEJISHISUOSHEXIANGDENEIYANGWANCHENGBUXIAN。BIRU,DUIYUDIANYUANXIANDEBUJU:

①ZAIPCBBUJUZHONGYINGJIANGDIANYUANTUIOUDIANLUSHEJIZAIGEXIANGGUANDIANLUFUJIN,ERBUYAOFANGZHIZAIDIANYUANBUFEN,FOUZEJIYINGXIANGPANGLUXIAOGUO,YOUHUIZAIDIANYUANXIANHEDIXIANSHANGLIUGUOMAIDONGDIANLIU,ZAOCHENGCUANRAO;

大发快三②DUIYUDIANLUNEIBUDEDIANYUANZOUXIANG,YINGCAIQUCONGMOJIXIANGQIANJIGONGDIAN,BINGJIANGGAIBUFENDEDIANYUANLVBODIANRONGANPAIZAIMOJIFUJIN;

③DUIYUYIXIEZHUYAODEDIANLIUTONGDAO,RUZAIDIAOSHIHEJIANCEGUOCHENGZHONGYAODUANKAIHUOCELIANGDIANLIU,ZAIBUJUSHIYINGZAIYINZHIDAOXIANSHANGANPAIDIANLIUQUEKOU。

       LINGWAI,YAOZHUYIWENYADIANYUANZAIBUJUSHI,JINKENENGANPAIZAIDANDUDEYINZHIBANSHANG。DANGDIANYUANYUDIANLUHEYONGYINZHIBANSHI,ZAIBUJUZHONG,YINGGAIBIMIANWENYADIANYUANYUDIANLUYUANJIANHUNHEBUSHEHUOSHISHIDIANYUANHEDIANLUHEYONGDIXIAN。YINWEIZHEIZHONGBUXIANBUJINRONGYICHANSHENGGANRAO,TONGSHIZAIWEIXIUSHIWUFAJIANGFUZAIDUANKAI,DAOSHIZHINENGQIEGEBUFENYINZHIDAOXIAN,CONGERSUNSHANGYINZHIBAN。


四、扇出设计

       ZAISHANCHUSHEJIJIEDUAN,BIAOMIANTIEZHUANGQIJIANDEMEIYIGEYINJIAOZHISHAOYINGYOUYIGEGUOKONG,YIBIANZAIXUYAOGENGDUODELIANJIESHI,DIANLUBANNENGGOUJINXINGNEICENGLIANJIE、ZAIXIANCESHIHEDIANLUZAICHULI。WEILESHIZIDONGBUXIANGONGJUXIAOLVZUIGAO,YIDINGYAOJINKENENGSHIYONGZUIDADEGUOKONGCHICUNHEYINZHIXIAN,JIANGESHEZHIWEI50milJIAOWEILIXIANG。YAOCAIYONGSHIBUXIANLUJINGSHUZUIDADEGUOKONGLEIXING,JINGGUOSHENZHONGKAOLVHEYUCE,DIANLUZAIXIANCESHIDESHEJIKEZAISHEJICHUQIJINXING,ZAISHENGCHANGUOCHENGHOUQISHIXIAN。GENJUBUXIANLUJINGHEDIANLUZAIXIANCESHILAIQUEDINGGUOKONGSHANCHULEIXING,DIANYUANHEJIEDIYEHUIYINGXIANGDAOBUXIANHESHANCHUSHEJI。


五、手动布线以及关键信号的处理


       XIANZAIHEJIANGLAISHOUDONGBUXIANDOUSHIYINSHUADIANLUBANSHEJIDEHENZHONGYAODEYIGEBUZOU,CAIYONGSHOUDONGBUXIANYOUZHUYUZIDONGBUXIANGONGJUWANCHENGBUXIANGONGZUO。TONGGUODUITIAOXUANCHUDEWANGLUO(net)JINXINGSHOUDONGBUXIANBINGJIAYIGUDING,KEYIXINGCHENGZIDONGBUXIANSHIKEYIJUDELUJING。

大发快三       SHOUXIANDUIGUANJIANXINHAOJINXINGBUXIAN,SHOUDONGBUXIANHUOJIEHEZIDONGBUXIANGONGJUJUNKE。BUXIANWANCHENGHOU,ZAIYOUYOUGUANDEGONGCHENGJISHURENYUANDUIZHEIXIEXINHAOBUXIANJINXINGJIANCHA,JIANCHATONGGUOHOU,JIANGZHEIXIEXIANGUDING,RANHOUKAISHIDUIQIYUXINHAOJINXINGZIDONGBUXIAN。YOUYUDIXIANZHONGZUKANGDECUNZAI,HUIJIDIANLUDAILAIGONGZUKANGGANRAO。YINCI,ZAIBUXIANSHIBUKEJIANGFANYOUJIEDIFUHAODEDIANSUIYILIANJIE,ZHEIKENENGHUICHANSHENGYOUHAIDEOUHE,YINGXIANGDIANLUDEGONGZUO。PINLVJIAOGAOSHI,DAOXIANDEGANKANGJIANGBIDAOXIANBENSHENDEDIANZUDAJIGESHULIANGJI。ZHEISHIDAOXIANSHANGJISHIZHILIUGUOHENXIAODEGAOPINDIANLIU,YEHUICHANSHENGYIDINGDEGAOPINDIANYAJIANG。YINCI,DUIGAOPINDIANLULAISHUO,PCBBUJUJINKENENGPAILIEJINCOU,SHIYINZHIDAOXIANJINKENENGDUAN。YINZHIDAOXIANZHIJIANHAIYOUHUGANHEDIANRONG,DANGGONGZUOPINLVJIAODASHI,HUIDUIQITABUFENCHANSHENGGANRAO,CHENGWEIJISHENGOUHEGANRAO。KEYICAIQUDEYIZHIFANGSHIYOU:

①JINLIANGSUODUANGEJIJIANDEXINHAOZOUXIAN;

②ANXINHAODESHUNXUPAILIEGEJIDIANLU,BIMIANGEJIXINHAOXIANXIANGHUKUAYUE;

③XIANGLINDELIANGMIANBANDEDAOXIANYAOCHUIZHIHUOJIAOCHA,BUNENGPINGXING;

大发快三④DANGBANNEIYAOPINGXINGBUSHEXINHAODAOXIANSHI,YINGSHIZHEIXIEDAOXIANJINKENENGJIANGEYIDINGDEJULI,HUOYONGDIXIAN、DIANYUANXIANGEKAI,DADAOPINGBIDEMUDE。


六、自动布线

       对关键信号的布线需要考虑在布线时控制一些电参数,比如减小分布电感等,在了解自动布线工具有哪些输入参数以及输入参数对布线的影响后,自动布线的质量在一定程度上可以得到保证。在对信号进行自动布线时应该采用通用规则。通过设置限制条件和禁止布线区来限定给定信号所使用的层以及所用到的过孔数量,布线工具就能按照工程师的设计思想来自动布线。在设置好约束条件和应用所创建的规则后,自动布线将会达到与预期相近的结果,在一部分设计完成以后,将其固定下来,以防止受到后边布线过程的影响。布线次数取决于电路的复杂性和所定义的通用规则的多少。现在的自动布线工具功能非常强大,通常可完成100%的布线。但是,当自动布线工具未完成全部信号布线时,就需对余下的信号进行手动布线。


7、布线的整理

      一些约束条件很少的信号,布线的长度很长,这时可以先判断出哪些布线合理,哪些布线不合理,再通过手动编辑来缩短信号布线长度和减少过孔数量。

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