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【干货】零欧电阻在电路设计中的巧妙运用

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【摘要】:
在电子电路设计时经常用到的一种元件就是电阻,我们都知道电阻在电路中起到分压限流的作用。然而,实际使用时会用到一种特殊的电阻:零欧电阻,故名思议,零欧电阻的电阻值是零。

浙江风采网 ZAIDIANZIDIANLUSHEJISHIJINGCHANGYONGDAODEYIZHONGYUANJIANJIUSHIDIANZU,WOMENDOUZHIDAODIANZUZAIDIANLUZHONGQIDAOFENYAXIANLIUDEZUOYONG。RANER,SHIJISHIYONGSHIHUIYONGDAOYIZHONGTESHUDEDIANZU:LINGOUDIANZU,GUMINGSIYI,LINGOUDIANZUDEDIANZUZHISHILING。DUIYUCHUXUEZHEKENENGHUIYOUYIGEYIWEN:JIRANZUZHISHILING,NEIMEHEYIGENDAOXIANYOUSHENMEQUBIE?WEISHENMEBUZHIJIELIANQILAI?

QISHI,LINGOUDIANZUHEZHIJIEYONGDAOXIANLIANJIEHAISHIYOUQUBIEDE,ERQIELINGOUDIANZUZAIDIANLUSHEJIZHONGHAIYOUHENDUOQIAOMIAODEYONGCHU。

1.调试与兼容

WOMENZAISHEJIPCBBANSHIXUYAOJINKENENGDUODEKAOLVDAOJIANRONGXINGDEWENTI,YINWEIYIKUAIDIANLUBANZUOHAOHOUJINGGUOWULIYINSHUAFUTONGCHULIHOUJIUSHIYIGEWULISHANGGUDINGDE。RUGUOZAISHEJISHIMEIYOUCHONGFENKAOLVJIANRONGXINGDEWENTI,NEIMEZAIDIANLUBANDIAOSHIJIEDUANHUIJIGONGCHENGSHIDAILAIHENDUOBUBIAN。

浙江风采网 JUGELIZI:XINPIANDEMOUGEYINJIAOYONGYOULIANGXIANGGONGNENG,BIRUKEYIQUDONGFENGMINGQI,YENENGGOUYONGYUQUDONGLEDDENG。DANSHIZHEILIANGXIANGGONGNENGBUNENGTONGSHIGONGZUO,WEILEZAITONGYIKUAIDIANLUBANSHANGSHIXIANKEYIXUANZEQUDONGNAGEQIJIAN,CISHIKEYIZAILIANJIEFENGMINGQIHELEDDEXIANLUSHANGJIASHANGLINGOUDIANZU,TONGGUOHANJIENATIAOTONGLUSHANGDELINGOUDIANLUJUEDINGQUDONGFENGMINGQIHAISHILEDDENG。

2.方便布线

ZAIPCBBUJUBUXIANJIEDUAN,YOUSHIHOUHUIPENGDAOBUXIANZONGSHIZOUBUTONGDEQINGKUANG,YOUQISHIZAIDIANLUBANMIANJIXIAO,LIANXIANDUO,CENGSHUSHAODESHIHOU。RUGUOYUDAOMOUYIGENLIANXIANXUYAORAOHENDAYIQUANCAINENGLIANTONG,ZHEISHI,KEYIKAOLVYIXIASHIFOUTONGGUOLIANJIEYIGELINGOUDIANZUJIUKEYIQINGSONGTIAOGUOMIANQIANDEDAOXIANERFEIRAOYIDAQUANXIANLU。

3.预留电阻位置

JIARUZAIDIANLUSHEJIJIEDUAN,MOUGEWEIZHIBUQUEDINGXUYAOJIESHANGDUODAZUZHIDEDIANZU,CISHI,KEYIZAIGAIWEIZHISHANGLIUCHUDIANZUDEHANJIEWEIZHI,BINGHANSHANGLINGOUDIANZU。ZAISHIJIDIANLUDIAOSHISHIKEYIFANGBIANDEGENGGAIBUTONGZUZHIDEDIANZU,DIAOSHIWANQUEDINGZUZHICANSHUHOUZAIJIESHANGHESHIDEDIANZU。

4.方便测试电流

SHEJIWANDIANLUXITONGHOU,TONGCHANGXUYAOCESHIZHENGGEDIANLUYUNXINGSHIDEGONGHAOSHIDUOSHAO。CHANGGUIDEZUOFASHITONGGUOCESHIDIANLIURANHOULIYONGDIANLIUJISUANGONGHAO,ERCESHIDIANLIUDEFANGFATONGCHANGSHIBADIANLIUBIAOCHUANJINDIANLUZHONGCELIANG。

CISHI,RUGUOZAIXUYAOCELIANGDIANLIUDEDIFANGFANGZHIYIGELINGOUDIANZU,DANGXUYAOCELIANGSHIJIUBADIANZUQUDIAO,BADIANLIUBIAOJIESHANG。ZHENGCHANGGONGZUOSHI,ZHIJIEHANSHANGLINGOUDIANZUJIKE。

5.噪声抑制

YOUYULINGOUDIANZUBENSHENDETEXING,NENGGOUYOUXIAOYIZHIHUANLUDIANLIU,CONGERSHIZAOSHENGDEDAOYIZHI。SHIJISHANGLINGOUDIANZUBUSHIZHENDESHIMEIYOUZUKANG,ZHIYOUCHAODAOTICAINENGGOUZHENDEZUODAOLINGZUKANG。SUOYI,LINGOUDIANZUZAISUOYOUPINDAISHANGQISHIDOUQIDAOSHUAIJIANDEZUOYONG。

6.安全保护

HENDUODIANLUBANSHANGJINGCHANGKEYIKANDAOYOUHENDUOCHAZHEN,XUYAOYONGTIAOXIANMAODUANJIE。HUOZHELIYONGBOMAKAIGUANKONGZHIDIANLUSHIFOUBIHE。ZHEILIANGZHONGFANGFASUIRANZAIDIAOSHIJIEDUANHUIBIJIAOFANGBIAN,DANSHI,ZAIZUOCHENGCHANPINSHIZUIHAOJINLIANGSHAOYONG。YOUYUZAIGAOPINDIANLUZHONG,KONGZHIDECHAZHENXIANGDANGYUTIANXIAN,HENRONGYISHIXINHAOSHOUDAOGANRAO。

浙江风采网 LINGWAI,BOMAKAIGUANHENRONGBEIBUZHIQINGDERENBOLUAN,DAOZHIDIANLUXITONGCHUCUO。SUOYI,CHUYUANQUANFANGMIANDEKAOLV,ZUIHAOSHIYONGLINGOUDIANZUDAITICHAZHENHEBOMAKAIGUAN。JIKEYIBIMIANWUCAOZUO,YOUNENGGOUJIANGDIWEIHUCHENGBEN。

7.充当电容电感

ZAIGAOPINDIANLUXITONGZHONG,LINGOUDIANZUYUWAIBUDIANLUTEXINGPIPEIQINGKUANGXIAKEYICHONGDANGYIGEXIAODEDIANRONGHUOZHEDIANGAN,NENGGOUHENHAODEJIEJUEEMCWENTI。BIRUDIYUDIZHIJIAN,HUOZHEDIANYUANHEXINPIANYINJIAOZHIJIAN。

8.地线隔离

浙江风采网 ZAIXINPIANSHEJIDANGZHONG,MONIDIANLUDEDICHENGWEIAVSS,SHUZIDIANLUDEDICHENGWEIVSS。AVSSHEVSSZAIXINPIANNEIBUTONGCHANGSHIYAOFENKAIDE,YOUYUFENKAIDIXIANKEYIBIMIANMONIDIANLUHESHUZIDIANLUZAIGONGZUOSHIDIANLIUXINHAOXIANGHUGANRAO。

浙江风采网 DANSHI,ZAIBANJISHANGDIXIANZUIHOUTONGCHANGSHILIANJIEZAIYIQIDE。CISHI,RANGXINPIANAVSSHEVSSPINXIANJINGGUOLINGOUDIANZUZAILIANJIEZAIYIQIKEYIQIDAOYIDINGDEGELIZUOYONG。

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