电话:0755-27579137 / 27579117
传真:0755-27579087
邮箱:sales@gen5g19.com
地址:深圳市宝安区西乡107国道旁桃源居桃源商务大厦B座
河南快3
·您现在所在的位置:网站河南快3 > 河南快3

深度解析NTC热敏电阻进行对数分段曲线拟合的技术分析

选伊萨,找光伟达

河南快3  NTCREMINJINGMIDIANZUSHIYIZHONGJINGMIDIANZUSHICHUANGANQI,JUYOUJINGMIDIANZUWENDUXISHUDA、XINGXIAOTIQING、REGUANXINGXIAO、WENDINGKEKAO、JIAGEBIANYI、JIEGOUJIANDANDENGTEDIAN,SHITAGUANGFANYINGYONGYUJIATINGKONGDIAO、QICHEKONGDIAO、LENGJU、BINGXIANGDENGXUYAOWENDUCELIANGHEKONGZHIDECHANGHE。DANNTCREMINJINGMIDIANZUSHIFEIXIANXINGYUANJIAN,QIEBENSHENJUYOUZIREXIAOYING,XUYAOSHEJICEWENXITONGKEFUZHEILIANGFANGMIANDEQUEXIAN。CHANGYONGYUJIEJUENTCREMINJINGMIDIANZUFEIXIANXINGDEFANGFAYOUJINGYANGONGSHIFA、ZUIXIAOERCHENGNIHEFA、YINGJIANDIANLUBUCHANGFAHEHENGYUANFAJIEHERUANJIANCHABIAOFA.JINGYANGONGSHIFAJISUANJIAOWEIFUZA,ZAIJIAOKUANWENDUFANWEINEIJINGDUBUGOUGAO。ZUIXIAOERCHENGFAXUYAOZAIDEDAODALIANGDESHIYANSHUJUXIAJINXING,GONGZUOLIANGJIAODA,ZHANYONGNEICUNYEJIAODA。YINGJIANDIANLUBUCHANGFADUIDIANZIYUANQIJIANDEYAOQIUJIAOGAO,SUIZHEDIANLUDEFUZADUDEZENGJIA,TONGSHIYEDAILAILEDIANLUFUJIAWUCHA。HENGYUANFAJIEHERUANJIANCHABIAOFAXUYAOZHANYONGJIAODACUNCHUKONGJIAN。ZHENDUIYISHANGFANGFADEBUZU,TICHULEYIZHONGSANJIEDUISHUGONGSHIFENDUANQUXIANNIHEFA,YOUYUYONGYUCHUANYONGCHAIYOUJI,BUJINYAOCELIANGWENDU,HAIYOUJIYOUYALIDENGXUYAOCELIANG,YINCICAIYONGDESHIYALIWENDUHEERWEIYIDECHUANGANQIXIAOLUNWEN,CELIANGWENDUSHIYONGDESHINTCREMINJINGMIDIANZU,YINGJIANBUFENDUINTCREMINJINGMIDIANZUGONGDIHEBUGONGDIYIJIFENDANGCESHIJINXINGLETANTAO,RUANJIANBUFENDUINTCREMINJINGMIDIANZUJINXINGDUISHUFENDUANQUXIANNIHEYIJICAIYONGHUADONGLVBODESUANFAJIANXIAOA/DCAIYANGYINQIDEWUCHA。

  1 R-T三阶对数公式的推导

河南快3  NTCREMINJINGMIDIANZUJIBENDER-TTEXINGKEYONGZHISHUHANSHUSHIBIAOSHI:

  深度解析NTC热敏精密电阻进行对数分段曲线拟合的技术分析(1)

  式中R为绝对温度为T时的零功率精密电阻值()。零功率精密电阻值指在规定的温度时,采用引起精密电阻值变化相对于总的测量误差来说可以忽略不计的值[3];R0 为绝对温度为T0时的零功率精密电阻值()。B为与热敏精密电阻材料、结构有关的敏感度系数,是以零功率精密电阻对时间的变化大小来表示的,它是由精密电阻-温度特性上任两点温度,求出的系数,不同的两点求出的B值是不同的,因此不能根据厂家给出的B值参考范围去测量温度,会带来较大的误差。

  TU1WEIBENWENCAIYONGDENTCREMINJINGMIDIANZUZAI0℃~120℃ZHIJIANJINGMIDIANZURYUSHESHIWENDUTDEGUANXIQUXIAN。

  

深度解析NTC热敏精密电阻进行对数分段曲线拟合的技术分析

河南快3  TU1 NTCREMINJINGMIDIANZUJINGMIDIANZU-WENDUTEXINGTU

  YOUTU1KEYIKANCHUNTCREMINJINGMIDIANZUZHIYUWENDUZHIJIANCUNZAIZHEYANZHONGDEFEIXIANXING,TONGCHANGDUIYUFEIXIANXINGDEQUXIANNIHECHULIDOUSHIZAIGONGSHI(1)DEJICHUSHANGJINXINGDE,KEDUIGONGSHI(1)JINXINGDUISHUBIANHUAN,SHIDEWENDUTHEJINGMIDIANZURDEZIRANDUISHUJINSICHENGXIANXINGGUANXIXIAOLUNWEN,BINGZAICIJICHUSHANGJINXINGDUOXIANGSHIZHANKAIHEFENDUANQUXIANNIHE。

河南快3  DUIDENGSHI(1)LIANGBIANTONGSHIQUZIRANDUISHU,JINXINGYUNSUANHOUKEDEXIASHI:

深度解析NTC热敏精密电阻进行对数分段曲线拟合的技术分析

河南快3 DANWENZHONGSUOYOUDESHUJUJISUANJUNCAIYONGWEICHULIQISHIXIAN,SHEJIZIRANDUISHUHEPINGFANG、SANCIFANGDENGDEYUNSUAN,ZONGHEKAOLVJINGDUHESHISHIXINGDEYAOQIU,QUDIAOPINGFANGXIANG,DESHI(7)。JINGSHIYANYANZHENG,NENGDADAOJINGDUYAOQIU,YOUTIGAOLECHENGXUDEYUNXINGSUDU。YOUTU1KEKANCHUNTCREMINJINGMIDIANZUZAI40℃、80℃CHUDEWENDU-JINGMIDIANZUBIANHUAJIAODA,RUOZAIZHENGGEQUJIANFANWEINEIDOUCAIYONGTONGYIGEDUOXIANGSHIJINXINGNIHE,ZEWUCHAJIAODA。CAIYONGDUISHUFENDUANQUXIANNIHE,YOUKAOLVDAOWEICHULIQICHULISHUJUSHIGEQUJIANBINGBUSHIXIANGHUWUGUANXIAOLUNWEN,ERSHIXIANGHUYOUZHONGDIE,SUOYIFENCHENG[0℃,40℃],[30℃,80℃],[70℃,120℃]3GEQUJIAN。

河南快3  y= H0+ H1x + H3x3(7)

河南快3  YINCIXUYAOZAIZHEI3GEQUJIANNEIQIUJIE3ZUBUTONGDEXISHUH0、H1、H3。GENJUREMINJINGMIDIANZUCHANGJIATIGONGDEWENDU-JINGMIDIANZUZHIBIAO,XUANQUQIZHONGDE3GEDIAN,KECAIYONGPUTONGDUOXIANGSHIFA、ZUIXIAOERCHENGFAHEQIEBIXUEFUDUOXIANGSHIFA[6]DUISANGEXISHUJINXINGJISUAN,DANZAIBENWENZHONGGAISANZHONGFANGFADEZHUNQUEDUXIANGCHABUDA。 YINCICAIYONGSUANFAZUIJIANDANDEPUTONGDUOXIANGSHIFAJINXINGJISUAN,KEDEYIXIASANGENIHEFANGCHENG:

深度解析NTC热敏精密电阻进行对数分段曲线拟合的技术分析

河南快3  YOUCI,SHIJIYINGYONGKEGENJUYISHANGSANGEFANGCHENGJINXINGRUANYINGJIANDESHEJI。

  2 NTC热敏精密电阻分段曲线拟合的硬件测量电路

  采用的NTC热敏精密电阻将测量水温和油温的NTC热敏精密电阻组装在了一起,测量油温的NTC热敏精密电阻本身有一端是接地的,测量水温的NTC热敏精密电阻两端均不接地。因此硬件测量电路中必须考虑NTC热敏精密电阻的共地与不共地问题。NTC热敏精密电阻随着温度的升高而阻值变小,0℃时阻值为5895,120℃时阻值为112.7。考虑到热敏精密电阻的自热效应小论文,流过NTC热敏精密电阻的电流不得超过1,选定为0.5,采用恒流源为热敏精密电阻提供0.5的电流。在0℃时NTC热敏精密电阻两端的电压大约为3V,在120℃时NTC热敏精密电阻两端的电压约为0.05V,0.05V的信号太小,单片机的A/D口进行采样后得到的信号非常弱,必须对NTC热敏精密电阻信号进行分档倍乘后采集,硬件测量电路框图如图2所示。

  

深度解析NTC热敏精密电阻进行对数分段曲线拟合的技术分析

河南快3TU2 REMINJINGMIDIANZUYINGJIANCELIANGDIANLU

  YOUTU1KEZHIREMINJINGMIDIANZUGONGDIHEBUGONGDIDEDIANLUJIEFA。FENWEI1BEI、5BEI、10BEISANDANG,1BEIDANGDUIYINGYU[0℃,40℃]WENDUQUJIAN,TADUIYINGDEA/DKOUDIANYAFANWEIWEI0.5V~3V,RUOA/DKOUDIANYADIYU0.5VXIAOLUNWEN,ZECAIYONG5BEIDANGJINXINGCELIANG;5BEIDANGDUIYINGYU[30℃,80℃]WENDUQUJIAN,TADUIYINGDEA/DKOUDIANYAFANWEIWEI0.1V~0.9V,RUOA/DKOUDIANYADIYU0.1V,ZECAIYONG10BEIDANGJINXINGCELIANG;10BEIDANGDUIYINGYU[70℃,120℃]WENDUQUJIAN。CAIYONG4TONGDAOSHUZIKONGZHIMONIKAIGUANCD4052DUIBEICHENGDANGJINXINGXUANZE。GAIREMINJINGMIDIANZUYONGYUCELIANGCHUANYONGCHAIYOUJIDESHUIWENHEYOUWEN,SHUIYOUWENGAOYU97℃SHIJINXINGBAOJING。

  3 NTC热敏精密电阻分段曲线拟合的软件设计

  3.1 A/DCAIYANGDEHUADONGLVBOSUANFA

  A/DKOUZAIDUIWENDUSHUJUJINXINGCAIJISHIHUICHANSHENGWUCHA,CAIYONGHUADONGLVBOSUANFAJIANXIAOGAIWUCHA。RUTU3SUOSHIWEIHUADONGLVBOSUANFAKUANGTU。

  

深度解析NTC热敏精密电阻进行对数分段曲线拟合的技术分析

  TU3 HUADONGLVBOSUANFAKUANGTU

  RUTU3SUOSHI,JIANGCAIJIDEWENDUSHUJUFANGDAOYIGEDUILIEZHONG,ZAIGANGKAISHIJINXINGCAIJIWENDUSHUJUSHI,WEIFANGZHIGANRAO,LIANXUCAIJI16CIHOUZAIDUICI16GESHUJUQIUHEBINGQIUPINGJUN,JIJIANGHEYOUYI4WEI。CIHOUXIAOLUNWEN,QU8WEIQIUHEBINGQUPINGJUN,JIJIANGHEYOUYI3WEI,CAIYANGYICIZUOYICIPINGJUN,PINGJUNHOUDESHUJUZHUNQUEDUGENGGAO。

河南快3  3.2 R-TZHUANHUANDECHENGXUSHIXIAN

河南快3  YINGJIANDIANLUBAJINGMIDIANZUDEBIANHUAZHUANHUAWEILEDIANYADEBIANHUA,BINGDUIDIANYAJINXINGFENDANGCAIJI。YAOCELIANGCHUWENDUZHI,XUYAOYIKAOCHENGXULAISHIXIAN。RUTU4SUOSHIWEISHUIWENDER-TZHUANHUANDECHENGXULIUCHENGTU,YOUWENDER-TZHUANHUANLEISI,JIANGBUZAIXUSHU。DUICAIJIDEWENDUSHUJUJIYIZHUANHUANWEIDIANYADESHUJUJINXINGPANDUAN,RUGUODIANYAZAI[0.5V,3V]FANWEI

  NEI,ZEDIANYACHUYU1BEIDANG,WENDUZHICHUYU[0℃,40℃]WENDUQUJIANNEIXIAOLUNWEN,YINCICAIYONGGONGSHI(8)JINXINGJISUAN;RUGUODIANYAZAI[0.1V,0.9V]FANWEINEI,ZEDIANYACHUYU5BEIDANG,WENDUZHICHUYU[30℃,80℃]WENDUQUJIANNEI,YINCICAIYONGGONGSHI(9)JINXINGJISUAN。RUGUODIANYABUCHUYUYISHANGLIANGGEQUJIAN,ZEZHIJIECAIYONG10BEIDANGDEWENDUGONGSHI(10)JINXINGJISUAN,BUYONGZAIJINXINGPANDUAN。

  

深度解析NTC热敏精密电阻进行对数分段曲线拟合的技术分析

  TU4 SHUIWENR-TZHUANHUANCHENGXULIUCHENGTU

  4 实验结果及分析

河南快3  GENJUSANGEQUXIANNIHEFANGCHENG,BINGJINXINGRUANYINGJIANSHEJIZUCHENGDECEWENXITONGJINXINGSHIYANCESHIDEDAODENIHESHUJUHEWUCHARUBIAO1SUOSHI:

  BIAO1 SHIYANCELIANGNIHEWENDU/NIHEWUCHA

深度解析NTC热敏精密电阻进行对数分段曲线拟合的技术分析

河南快3  YOUBIAO1KEYIFAXIAN,CAIYONGDUISHUFENDUANQUXIANNIHEDENIHEWUCHAZAI30℃SHIZUIDAYUEWEI0.2℃,YUANYINKENENGSHIYOUYUFEIXIANXINGBIANHUANZAOCHENGDE,DANZONGDELAISHUO,NIHEJINGDUHAISHIBUCUODE。XITONGYINGJIANCAIYONGLEHAOANJIHENGLIUYUANJIANGDILEREMINJINGMIDIANZUDEZIREXIAOYINGXIAOLUNWEN,RUANJIANCAIYONGLEHUADONGLVBODESUANFAJIANSHAOA/DZHUANHUANDAILAIDEWUCHA,XITONGRUANYINGJIANJIEHESHIXIANLEDUISHUFENDUANQUXIANNIHE,WEIZHENGGECEWENXITONGTIGONGLEJINGDUJIAOGAO、SHISHIXINGJIAOHAODECELIANG。

  5 结束语

河南快3  NTCREMINJINGMIDIANZUCAIYONGDUISHUFENDUANQUXIANNIHEDEFANGSHI,DUINTCREMINJINGMIDIANZUDEJINGMIDIANZU-WENDUTEXINGGONGSHIJINXINGLEBIANHUAN,ZAIJINSICHENGXIANXINGDETIAOJIANXIADUIWENDUJINXINGFENDUANQUXIANNIHE,JINGDUJIAOGAO。QUDIAOPINGFANGXIANG,TIGAOLEWEICHULIQIDEYUNSUANSUDU。BIANCHENGJIAOYISHIXIAN,CHENGXUYUNSUANSUDUJIAOKUAI,SHISHIXINGJIAOHAO。ZHIXUGENGGAINIHEDUOXIANGSHIDEXISHUJIKEDUIQITAXINGHAODENTCREMINJINGMIDIANZUJINXINGNIHE,HUHUANXINGQIANG。ZAI0℃~120℃WENDUFANWEI,DUISHUFENDUANQUXIANNIHEDENIHEJINGDUYAOYOUYUPUTONGDUOXIANGSHINIHE。GAIFANGANZAILILUNDEYANZHENGXIA,YITONGGUOBIANCHENGSHIXIAN,TONGGUOCHANGJIADEYANSHOU,YIJIAOFUCHANGJIAYINGYONGDAOCHUANYONGCHAIYOUJIJINXINGSHIJICEWEN,YUNXINGZHENGCHANG。

var _hmt = _hmt || []; (function() { var hm = document.createElement("script"); hm.src = "https://hm.baidu.com/hm.js?be055eb5acfdc25d3bd72279b8418725"; var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(hm, s); })();