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「电源外围设计经验」压敏电阻MOV选型指南

   日期:2020-03-06     浏览:257    评论:0    
核心提示:在电源应用过程中,为保证电源的供电稳定与电源的安全,常常会设计外围保护电路以确保电源使用过程中不被损坏。外围电路包括浪涌冲击保护电路、防静电保护电路、EMI滤波电路、脉冲群抗扰电路。本文将对浪涌冲击保护电路中使用的压敏电阻​MOV的使用和选型方法展开论述。

电源应用过程中,为保证电源的供电稳定与电源的安全,常常会设计外围保护电路以确保电源使用过程中不被损坏。外围电路包括浪涌冲击保护电路、防静电保护电路、EMI滤波电路、脉冲群抗扰电路。本文将对浪涌冲击保护电路中使用的压敏电阻MOV的使用和选型方法展开论述。

压敏电阻MOV选型指南

一、什么是压敏电阻?

压敏电阻,即MOV(me四川快乐12tal Oxide Varistors),是一种非线性伏安特性的限压型保护器件,其本体是由氧化锌颗粒组成的矩阵结构,颗粒之间的晶界类似双向PN结的电气特性。

YAMINDIANZUDEYINGYONGCHANGHE:YAMINDIANZUQICHANGCHANGYUBEIBAOHUQIJIANHUOZHUANGZHIBINGLIANSHIYONG,ZAIDIANLUCHENGSHOUGUOYASHIJINXINGDIANYAQIANWEI,XISHOUDUOYUDEDIANLIUCONGERSHIXIANDUIHOUJIDIANLUDEBAOHU。

四川快乐12YAMINDIANZUDEZHUYAOTEXING:DANGLIANGDUANSUOJIADIANYAZAIBIAOCHENGEDINGZHIYINEISHI,QIDIANZUZHIJIHUWEIWUQIONGDA,CHUYUGAOZUZHUANGTAI,LOUDIANLIUDIZHIJISHIWEIAN;DANGLIANGDUANSUOJIADIANYASHAOWEICHAOGUOEDINGZHISHI,QIDIANZUZHIJIJUXIAJIANG,LIJICHUYUDAOTONGZHUANGTAI,GONGZUODIANLIUZENGJIAJIGESHULIANGJI,FANYINGSHIJIANDIZHINAMIAOJI。DANGLIANGDUANSUOJIADIANYACHAOGUOQIZUIDAXIANZHIDIANYASHI,TAJIANGWANQUANJICHUANSUNHUAI,WUFAZIXINGHUIFU。

四川快乐12ZHENGCHANGSHIYONGSHI,YAMINCHUYULOUDIANLIUQU,SHOULANGYONGCHONGJISHIJINRUFEIXIANXINGQUXIEFANGLANGYONGDIANLIU,YIBANBUNENGJINRUBAOHEQU。DANGYAMINDIANYAJIAODISHI,YAMINGONGZUOYULOUDIANLIUQU,CHENGHENDADIANZU,LOUDIANLIUHENXIAO;DANGDIANYASHENGGAODAOFEIXIANXINGQU,DIANYABIANHUABUDA,DIANLIUZAIXIANGDANGDAFANWEINEIBIANHUA,XIANYATEXINGJIAOHAO;DANGDIANYAZAISHENGGAO,YAMINJINRUBAOHEQU,CHENGXIANHENXIAODEXIANXINGDIANZU,DIANLIUHENDA,SHIJIANYIZHANGYAMINHUIGUOREERSHAOHUAISHENZHIZHALIE。YINCI,YAMINDIANZUBUNENGZHANGQICHENGSHOU1mADEDIANLIU。

压敏电阻的特点:

1.GONGZUODIANYAFANWEIKUAN(ZHULIU18-1800V,FENRUOGANDANG);

四川快乐122.DUIGUOYAMAICHONGXIANGYINGKUAI(JIZHIJISHInS);

四川快乐123.NAICHONGJIDIANLIUDENENGLIQIANG(KEDA100-15000A);

四川快乐124.LOUDIANLIUXIAO(DIYUJIZHIJISHIuA);

5.DIANZUWENDUXISHUXIAO。

二、压敏电阻命名规则

四川快乐12LIRU471KD14:BIAOCHENGDIANYAWEI470VDC,GONGCHAWEI±10%(JIDONGZUODIANYAZAI423~517VDCZHIJIAN),XINGZHUANGWEIYUANXING,ZHIJING14mm。

三、规格计算

步骤一:压敏电压(VARISTOR VOLTAGE)计算

四川快乐12V1mA=1.5Vp=2.2Vnom   (1)

SHIZHONG,VpWEIDIANLUEDINGDIANYADEFENGZHI,VnomWEIEDINGJIAOLIUDIANYADEYOUXIAOZHI。

LIRU:MOUKEHUSHIYONGJINSHENGYANGLHE60-20B12DIANYUANCHANPIN,EDINGSHURUDIANYAWEI220VAC,ZEYAMINDIANZUDIANYAZHI:

V1mA=1.5Vp=1.5×1.414×220V=476VDC

V1mA=2.2Vnom=2.2×220V=484VDC

YINCIYAMINDIANZUDEJICHUANDIANYAV1mAKEXUANZAI470-480VZHIJIAN,RUV1mAXUAN470V,DUIYING471KDxxYAMIN。

步骤二:最大允许电压(MAXIMUM ALLOWABLE VOLTAGE)计算

CIDIANYAFENJIAOLIU(VACrms)HEZHILIU(VDCr)LIANGZHONGQINGKUANG:

四川快乐12VACrms≈0.64V1mA     (2)

VDCr≈0.83V1mA        (3)

四川快乐12TONGYANGYIBUZHOUYIDELIZI,ZEJISUANBUZHOURUXIA:

V1mA=470V,ZEVACrms≈0.64V1mA=300VAC,VDCr≈0.83V1mA=390VDC

ER471KDxxYAMINDUIYINGDEVACrms=300V,VDCr=385V,BUZHOUYIJISUANCHUDECANSHUYANZHENGKEXING。

步骤三:通流容量(I(8/20us))计算

四川快乐12ZUIDATONGLIULIANGYUYAMINDIANZUZHIJINGCHENGZHENGBI。ZAIXUANZEYAMINDIANZUZHIJINGSHI,YAOQUEDINGBEIBAOHUDIANLUDELEIJILANGYONGDENGJI,YICILAIXUANZEYAMINDIANZUDEZUIDATONGLIULIANG。

四川快乐12DUIYAMINJINXINGCHONGJISHIYANSHI,SUIZHESUOJINXINGDECHONGJICISHUDEZENGJIA,MEICISUOSHIJIADECHONGJIDIANLIUYAOXIANGYINGJIANXIAO。TONGCHANG,XIANXINGDEJISHUGUIGESHUZHONGDOUJICHUYAMINCHONGJI1CIDEIZHI。YINCI,YIBANWOMENZAIXUANZEYAMINSHI,QITONGLIURONGLIANGYAOANYAMINLANGYONGSHOUMINGCISHUDINGEQUXIANZHONGCHONGJI10CIDAO100CILAIJISUAN,QISHIJITONGGUODELANGYONGDIANLIUYUEWEIZUIDACHONGJITONGLIULIANGDE30%ZUOYOU(JI0.3I)。

RUGUOBUZHIDAOLANGYONGDENGJISUOYAOQIUDETONGLIULIANG,KEANZHAOXIATUYIYAMINLIANGDUANDECHAMODIANYAJINXINGJISUAN。

LIRU:LANGYONGCHAMODIANYAVtest=2KV,YAMINDIANZU471KDxxZUIDAXIANZHIDIANYAVCLAM=775V,ZETONGLIULIANGJISUAN:

Ip= (Vtest-VCLAM)/2 = 612.5A    (4)

I=Ip/0.3=2042A                       (5)

471KD10YAMINDUIYINGDETONGLIULIANG(KANYAMINGUIGESHUWithstanding Surge CurrentLIE)IWEI2500A,DAYU2042A;ER471KD07YAMINDUIYINGDETONGLIULIANGIZHIYOU1750A;

四川快乐12GUBUZHOUYIDEANLIZHONG,YAMINDIANZUJIANYIXUANZE10DYISHANG,RU471KD10。

四、关键指标

1)BIAOCHENGYAMINDIANYA(V1mA):ZHITONGGUOGUIDINGCHIXUSHIJIANDEMAICHONGDIANLIU(YIBANWEI1mA CHIXUSHIJIANYIBANXIAOYU400mS)SHIYAMINDIANZUQILIANGDUANDEDIANYAZHI;

四川快乐122)ZUIDAXIANZHIDIANYA(VCLAM):JICANYA,ZHIZAIYAMINNENGCHENGSHOUDEZUIDAMAICHONGFENGZHIDIANLIUIpJIGUIDINGBOXINGXIAYAMINDIANZULIANGDUANDIANYAFENGZHI;

3)TONGLIURONGLIANG(Ip):ZHIZAIGUIDINGDETIAOJIAN(GUIDINGDESHIJIANJIANGEHECISHU,SHIJIABIAOZHUNDECHONGJIDIANLIU)XIA,YUNXUTONGGUOYAMINDIANZUQISHANGDEZUIDAMAICHONG(FENGZHI)DIANLIUZHI;

4)LOUDIANLIU:ZHIZAI25℃TIAOJIANXIA,DANGSHIJIAZUIDALIANXUZHILIUDIANYASHI,YAMINDIANZUQIZHONGLIUGUODEDIANLIUZHI;

5)DENGJIDIANYA:ZHIYAMINDIANZUZHONGTONGGUO8/20DENGJIDIANLIUMAICHONGSHIZAIQILIANGDUANCHENGXIANDEDIANYAFENGZHI。

五、注意事项

1)XIANGYINGSHIJIAN:YAMINDIANZUDEXIANGYINGSHIJIANWEInsJI,BIQITIFANGDIANGUANKUAI,BITVSGUANSHAOMANYIXIE;

2)JIEDIANRONG:YAMINDIANZUDEJIEDIANRONGYIBANZAIJIBAIDAOJIQIANpFDESHULIANGJIFANWEI,HENDUOQINGKUANGXIABUYIZHIJIEYINGYONGZAIGAOPINXINHAOXIANLUDEBAOHUZHONG,YINGYONGZAIJIAOLIUDIANLUDEBAOHUZHONGSHI,YINWEIQIJIEDIANRONGJIAODAHUIZENGJIALOUDIANLIU,ZAISHEJIFANGHUDIANLUSHIXUYAOCHONGFENKAOLV;

四川快乐123)TONGLIURONGLIANG:YAMINDIANZUDETONGLIURONGLIANGJIAODA,DANBIQITIFANGDIANGUANXIAO;

4)DIANLUWEIZHI:YAMINDIANZUYIBANYINGYONGZAICHANPINDESHURUDUANLXIANHENXIANZHIJIAN,ZHIYUBAOXIANSIZHIHOU,REMINDIANZUZHIQIAN;

5)CANYA:YAMINDIANZUDECANYA(JIZUIDAXIANZHIDIANYA)HUIZHIJIESHIJIADAOCHANPINDEHOUDUANDIANLU,CANYAGUODAKENENGHUIDAOZHIHOUDUANQIJIANSUNHUAI(RUZHENGLIUQIAOHUOZHEDADIANRONG),YINCISHEJISHIYAOBAOZHENGCANYABUCHAOGUOHOUJIDIANLUNENGCHENGSHOUDEZUIDADIANYA;

四川快乐126)ZAIDIANLUSHEJISHI,SHURUYAMINDIANZUDETOUYINGYAOYUANLIKONGZHIIC,FANGZHILANGYONGCESHISHIICSHOUGANRAO,DAOZHISHUCHUDIANYAZAILANGYONGCESHISHICHUXIANDIAODIAN。

六、压敏电阻的测量

DANDUCELIANG:TONGCHANGYAMINDIANZUJUYOULIANGHAODEFEIXIANXING,JIZUZHISUISUOJIADIANYADEZENGJIAERJIANSHAO,QIEJUYOUSHUANGXIANGDIANLIUTEXING。CELIANGSHI,JIANGWANYONGBIAOZHIYUR×1kDANG,CEQILIANGYINJIAOZHIJIANDEZHENGFANXIANGJUEYUANDIANZU,JUNWEIWUQIONGDA,FOUZESHUOMINGLOUDIANLIUGUODA。RUGUOSUOCEDIANZUGUOXIAO,SHUOMINGYAMINDIANZUYISUNHUAI,BUNENGSHIYONG。KEYIYONGSHUZIWANYONGBIAOCELIANGYAMINDIANZU。

四川快乐12DIANYUANSHIYONGZHONG,WAIWEIDIANLUSHIBIBUKESHAODECUNZAI,XUANZESHIHEDEYAMINDIANZUMOVDUILANGYONGCHONGJIBAOHUDIANLUYOUWEIZHONGYAO。

 


 
标签: 电源 压敏电阻
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