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一种高可靠性压力传感器信号变送电路设计

发布时间:2018-9-20      发布人:泽天传感      点击:

薄膜压力传感器输出的信号一般比较微弱,为保证信号的远距离传输或数字化处理,设计信号调理电路对应变压力信号与热电阻温度信号进行调理,转换成标准的1~5V输出。在电路的设计上,着重考虑抗干扰性能和高可靠性。

BOMOYALICHUANGANQIXINHAOBIANSONGDIANLUSHEJICAIQUYIXIAZONGTIFANGAN,GAIDIANLUMONIXINHAODIAOLI,JUYOUXIANGYINGSUDUKUAI,GONGZUODIANYAKUAN、GONGHAODI,GONGZUOKEKAO,SHENGCHANDIAOSHIFANGBIANDENGYOUDIAN。

压力传感器信号处理电路原理图
图1 压力传感器信号处理电路原理图

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BOMOYALICHUANGANQICAIYONGAD620WEIXINHAODIAOLIDIANLUYOUYIXIATEDIAN:

a. GAIXINPIANNAIFUHEMEIJUNBIAOBIAOZHUNSHENGCHANDEJICHENGDIANLU,CHANPINZHILIANGYOUBAOZHENG,BINGQIEXINPIANTIJIXIAO(DIP-8FENGZHUANG),SHIYONGFANGBIAN;b. GAIXINPIANWEIDANPIANJICHENGDEYIBIAOFANGDAQI,GONGZUOWENDUWEI-55℃~125℃,MUQIANGUONEIRENGWUTONGLEIXINPIANSHENGCHAN;c. GAIXINPIANDEGONGMOYIZHIBIDADAO100dB,NENGGOUDUICHUANGANQIDECHAFENXINHAOJINXINGYOUXIAOFANGDA,BINGQIEQIFANGDABEISHUZHIXUTONGGUOYIGEWAIJIEDIANZULAIDIAOZHENG,GENJUCHUANGANQISHUCHUXINHAODEDAXIAO,WOMENZHIXUXUANZEYIGEHESHIDEDIANZUZHIJIUNENGDEDAOXUYAODEFANGDABEISHU,QISHUCHUWEIVout=Vin×(49.4KΩ/Rg+1)+Vref;QIZHONGVinWEICHUANGANQIDESHUCHUXINHAO,RgWEIWAIJIELIANGCHENGDIANZU,WOMENTONGGUODIAOJIEVinDEDAXIAO,DEDAOCHUANGANQIDELINGDIANSHUCHU,DIAOJIERgDEDAXIAODEDAOCHUANGANQIDEMANDUSHUCHU。

BOMOYALICHUANGANQICAIYONGLM117ZUOWEIGONGDIANDIANYUAN,LM117JUYOUYIXIATEDIAN:

a. GAIQIJIANNAIFUHEMEIJUNBIAOBIAOZHUNSHENGCHANDEJICHENGDIANLU,CHANPINZHILIANGYOUBAOZHENG,BINGQIEXINPIANTIJIXIAO(TO-39);b. GAIQIJIANDESHUCHUDIANYAKEYIRENYIDIAOZHENG,SHIYONGFANGBIAN,BINGQIEJUYOUSHUCHUDUANLUBAOHUDEGONGNENG;c. GAIQIJIANDEWENBOYIZHIBIDADAO80dB,NENGGOUSHUCHUWENDINGDEDIANYA;BINGQIEZAI-55℃~125℃FANWEINEI,QISHUCHUDIANYABIANHUAZAI±0.5%,YOULIYUCHUANGANQIGONGDIAN。

DUIBOMOYALICHUANGANQIDEDIANLUCAIQUDEKANGDIANCIGANRAOCUOSHIRUXIA:

a. 在电源输出端采取LC滤波处理,保证了电源能够稳定工作;b. 在输出端采取了RLC低通滤波处理,截止频率为10K。c. 将电路放置在密封金属外壳内,然后采用屏蔽电缆出线,使电路能够禁受辐射干扰。本文源自泽天传感,福彩快三,转载请保留。