Qhov zoo thiab qhov tsis zoo ntawm plaub hom kub sensors

Qhov zoo thiab qhov tsis zoo ntawm plaub hom kub sensors
Xaiv cov khoom siv ntsuas kub ntsuas yuav zoo li tsis tseem ceeb, tab sis vim muaj ntau yam khoom muaj, txoj haujlwm no tuaj yeem cuam tshuam ntau. Tsab ntawv xov xwm no qhia txog plaub hom kev ntsuas kub (qhov ntsuas kub tsis kam (RTDs), thermocouples, thermistors, thiab kev sib koom ua ke (IC) sensors nrog digital thiab analog interfaces), thiab tshawb txog qhov zoo thiab qhov tsis zoo ntawm txhua lub sensor.
Los ntawm qhov kev xav ntawm cov txheej txheem software, seb qhov ntsuas kub puas haum rau koj daim ntawv thov yuav nyob ntawm qhov yuav tsum tau muaj qhov kub thiab txias, qhov tseeb, linearity, kev daws teeb meem, kev ua haujlwm, lub zog, kev daws teeb meem, thiab cov txheej txheem kev teeb tsa (nto mount txoj kev, faus qhov ntxig. txoj kev, thiab circuit board sab nraud installation txoj kev). Nws tseem yog ib qho tsim nyog yuav tsum tau sib xws nrog cov theem ntawm kev tsim cov kev daws teeb meem yooj yim rau cov hluav taws xob circuits. (Pressure transmitter)
RTD
Thaum qhov kub hloov pauv thaum ntsuas qhov tsis kam ntawm RTD, cov lus teb yuav yog qhov tseem ceeb tshaj tawm raws li cov kab thiab qhia tias tsis kam. Raws li pom nyob rau hauv daim duab 1, qhov kev tiv thaiv nkhaus ntawm RTD tsis yog linear tag nrho, tab sis muaj ntau qhov sib txawv (qhia cov kab ncaj nraim siv) tab sis tuaj yeem ua tau zoo heev thiab rov tsim dua. Txhawm rau them nyiaj rau qhov tsis sib xws me ntsis no, ntau tus neeg tsim qauv digitize qhov ntsuas ntsuas qhov ntsuas thiab siv cov txheej txheem kho uas siv cov rooj saib hauv microcontrollers. Qhov kev rov tsim dua tshiab thiab kev ruaj ntseg ntawm qhov kub thiab txias (kwv yees li -250} degree C mus rau +750 degree C) ua rau RTD muaj txiaj ntsig zoo hauv kev siv suab nrov, suav nrog ntsuas qhov ntsuas kub ntawm cov kua lossis roj hauv cov kav dej thiab cov ntim loj.
Qhov nyuaj ntawm circuits siv los ua RTD analog signals txawv heev nyob ntawm daim ntawv thov. Nws yog ib qho tsim nyog yuav tsum muaj cov khoom siv xws li amplifiers thiab analog-to-digital converters (ADCs) uas tsim kom muaj qhov tsis raug. Tsuas yog lub hwj chim ntawm lub sensor thaum xav tau kev ntsuas - txoj kev no tuaj yeem ua tiav lub zog qis, tab sis nws yuav ua rau lub voj voog ntau dua. Tsis tas li ntawd, cov zis hluav taws xob xav tau rau tus maub los yuav tsum tau ntsaws rau hauv kuj tuaj yeem ua rau nws qhov kub thiab txias, yog li cuam tshuam qhov tseeb ntawm kev ntsuas qhov tseeb. Tam sim no tsuas yog ob peb mAh, hom kev ua cua sov ntawm tus kheej no yuav ua rau qhov sib txawv ntawm qhov kub thiab txias (uas tuaj yeem kho tau, tab sis yuav tsum tau txiav txim siab ntxiv). Tsis tas li ntawd, thov nco ntsoov tias tus nqi ntawm cov hlau qhov txhab platinum RTDs lossis nyias zaj duab xis RTDs tuaj yeem siab heev, tshwj xeeb tshaj yog piv rau cov nqi ntawm cov khoom siv hluav taws xob sib txuas.

Thermistor
Thermistor yog lwm hom resistor hom maub los. Muaj ntau hom thermistors, los ntawm cov khoom lag luam zoo thiab cov nqi qis rau cov khoom lag luam siab. Tus nqi qis, tsis tshua muaj siab thermistors tuaj yeem ua qhov yooj yim thiab meej ntsuas lossis ntsuas qhov pib ua haujlwm - hom varistor no yuav tsum muaj ntau yam khoom (xws li kev sib piv, kev siv, thiab cov varistors discrete), tab sis yog tus nqi-zoo thiab muaj cov yam ntxwv ntawm qhov kub thiab txias ntawm discrete. systems, raws li pom nyob rau hauv daim duab 2. Yog hais tias nws yog tsim nyog los ntsuas kom tau ib tug ntau yam ntawm cov kub, koj yuav tsum tau nqa tawm ib tug ntau ntawm linearization kev daws teeb meem. Kev kho ntau qhov kub thiab txias yuav tsim nyog. Txhawm rau kom ua tiav qhov raug siab dua, cov nqi kim dua thiab me dua thermistor arrays tuaj yeem siv los pab daws qhov teeb meem no tsis yog kab, tab sis cov arrays no feem ntau tsis zoo li cov thermistors.
Vim yog qhov nyuaj thiab tus nqi ntawm ntau qhov chaw mus ncig, cov thermistors uas tsis tshua muaj nqi feem ntau tsuas yog siv rau cov ntawv thov uas yuav tsum tau ua haujlwm qis tshaj plaws, suav nrog toasters, kas fes txiag, tub yees, thiab tshuab ziab khaub ncaws. Tsis tas li ntawd, thermistors kuj tuaj yeem ntsib qhov kev sib tw ntawm tus kheej cua sov (feem ntau ntawm qhov kub siab dua, thaum lawv cov resistors qis dua). Zoo li RTD, lub hauv paus ua rau tsis muaj peev xwm siv cov thermistor ntawm qhov hluav taws xob qis hluav taws xob tsis tau pom, tab sis thov nco ntsoov tias qhov qis dua qhov kev faib tawm tag nrho, qhov qis dua qhov rhiab heev ntawm lub kaw lus ncaj qha los ntawm cov yam ntxwv ntawm analog-rau-digital. converters (ADCs). Daim ntawv thov uas tsis muaj hwj chim no kuj yuav tsum tau ua kom lub complexity ntawm Circuit Court, ua rau nws rhiab heev rau lub suab tsis raug. Thermistors tuaj yeem ua haujlwm nyob rau hauv qhov kub ntawm -100 degree rau +500 degree, txawm hais tias feem ntau cov thermistor muaj qhov ntsuas kub siab tshaj plaws ntawm +100 degree rau +1509C
Platinum Thermistor
Lub thermocouple suav nrog kev sib txuas ntawm ob lub xov hlau ua los ntawm cov khoom sib txawv. Piv txwv li, ib hom thermocouple yog tsim los ntawm hlau thiab constantan. Hu rau 1 yog nyob ntawm qhov ntsuas kub, thaum tiv tauj 2 thiab tiv tauj 3 yog qhov sib txawv ntawm qhov ntsuas kub ntsuas los ntawm LM35 analog kub sensor. Cov zis voltage yog kwv yees li proportional rau qhov sib txawv ntawm ob qhov ntsuas kub no.
Vim yog qhov tsis tshua muaj siab ntawm platinum thermistors (hauv qhov hnyav hnyav ntawm kaum tawm microvolts ib Celsius), koj yuav tsum siv lub tshuab hluav taws xob qis qis los tsim cov khoom siv hluav taws xob ua haujlwm. Nyob rau hauv kev ua haujlwm ntau ntawm cov thermocouples, qhov tsis sib xws ntawm qhov kub ntawm qhov hluav taws xob hloov hluav taws xob feem ntau yuav tsum tau them nyiaj circuits lossis cov rooj saib xyuas, ib yam li RTDs thiab thermocouples. Me me puas paub tias txawm tias qhov tsis xws luag no, platinum thermistors tseem yog fashionable, tshwj xeeb tshaj yog nyob rau hauv daim ntawv thov xws li hluav taws xob ncu, dej thiab hluav taws xob tso cua sov, kilns, kuaj cov cuab yeej, thiab lwm yam kev lag luam kev daws teeb meem - vim hais tias cov thermal zoo ntawm platinum thermistors yog tsawg heev. , thiab kev khiav hauj lwm kub ntau (kev khiav hauj lwm kub tuaj yeem txuas mus rau ib ncig ntawm 2300 degree) yog qhov nyuaj heev, (kub sensors)

IC maub los
Lub IC sensor ua haujlwm nyob rau hauv qhov kub thiab txias ntawm -55 degree C mus rau +150 degree C. Qee qhov|C sensors ua haujlwm txog li +200 degree . Muaj ntau yam kev sib koom ua ke IC sensors, thiab plaub feem ntau yog kev sib xyaw IC sensors nrog cov khoom siv analog tso tawm, cov khoom siv digital interface, cov chaw taws teeb tswj qhov kub thiab txias ua haujlwm! C sensor (kub hloov). Cov khoom tsim tawm (feem ntau yog cov khoom siv hluav taws xob ua haujlwm, tab sis qee qhov kuj muaj cov khoom siv hluav taws xob rov qab) yog cov kev daws teeb meem zoo tshaj plaws thaum siv ADC kom ntse daws cov ntaub ntawv tso tawm cov teeb liab. Cov khoom siv digital interface feem ntau siv ob lub xov hlau sib txuas (12C lossis PMBus) nrog ADC built-in
Ntxiv nrog rau cov ntsuas kub hauv zos, cov chaw taws teeb ntsuas kub kuj tseem muaj txoj hauv kev los yog ntau yam khoom siv rau kev saib xyuas qhov kub thiab txias ntawm cov chaw taws teeb diodes, thiab tau teem rau hauv cov IC IC tshaj plaws (xws li processor lossis field programmable gate array [FPGA]). Lub ntsuas kub tswj tau tuaj yeem tso lub tswb yooj yim thaum lub ntsuas kub mus txog.
Muaj ntau qhov zoo rau kev siv cov khoom siv hluav taws xob sib xyaw ua ke, suav nrog: kev siv hluav taws xob tsawg; Muaj peev xwm muab cov khoom ntim me me (qee qhov me me li {{0}}.8mm x 0.8mm); Tus nqi qis qis kuj tuaj yeem ua tiav hauv qee qhov kev siv. Tsis tas li ntawd, raws li kev sib koom ua ke ntawm cov ntsuas hluav taws xob tau ntsuas thaum lub sijhawm ntsuas kev tsim khoom, tsis tas yuav tsum ntsuas ntxiv. Lawv feem ntau siv rau hauv daim ntawv thov kev noj qab haus huv, cov khoom siv hnav, cov tshuab suav, cov ntaub ntawv kaw, thiab daim ntawv thov tsheb.
Cov neeg tsim khoom siv hluav taws xob muaj kev paub dhau los yuav siv cov kev daws teeb meem uas tsim nyog tshaj plaws raws li cov khoom siv kawg. Table 1 qhia txog qhov zoo sib xws / lub peev xwm ua haujlwm ntawm txhua qhov ntsuas kub. (Hloov Sensor)
Yuav xaiv LDO li cas
ESR ntawm LDO
Tam sim no hom BUCK hloov pauv muaj nuj nqi (xws li, tsom xam)
Tshawb nrhiav qhov sib txawv ntawm LDO thiab DC / DC Hloov Cov Khoom Siv Hluav Taws Xob
Yuav ua li cas tso siab rau LDO los txhim kho lub teeb load thiab kev ua haujlwm siab ntawm cov ntshav siab txo qis converters
Ob txoj hauv kev rau LDO txuag hluav taws xob hauv loT