Iyi ndiyo chinyorwa chekutanga mune maviri-chikamu cheverengeka. Ichi chinyorwa chinotanga kurukura nhoroondo yacho uye kugadzirwa zvinonetsaThermistor-based tembirichaKuyerwa masisitimu, pamwe nekuenzanisa kwavo nekupesana nekupokana thermometer (RTD) tembiricha kuyera masisitimu. Izvo zvicharondedzerawo sarudzo yeTermistor, kugadziridzwa kwekutengeserana-offs, uye kukosha kweSigma-Delta Analog-kune-digital shanduri (ADC) munzvimbo ino yekushandisa. Chinyorwa chechipiri chinonyatsodzora nzira yekuwedzera uye kuongorora iyo yekupedzisira iyo yekupedzisira-yakavakirwa chiyero system.
Sezvinotsanangurwa muchinyorwa chakapfuura, optimizing rtd tembiricha sensor masystem, rtd inodziya yavo yekupokana kwayo inosiyana nekushisa. Thermisistrters ibasa zvakafanana nertds. Kusiyana nertds, iyo inongova neyakajeka tembiricha, mujaya anogona kuve neyakajeka kana yakaipa tembiricha inoenderana. Tembiricha isina kunaka yekushambadzira PaPigi. 1 inoratidza mhinduro yemhinduro dzeiyo chaiyo NTC uye ptc thermisrists uye inovatadzisa kune rtd curves.
Panyaya yekupisa renji, iyo rtd curve iri pedyo nenhamba, uye sensor inovhara tembiricha yakawanda kupfuura yevatengi RTDS dzinowanzopihwa mune dzinozivikanwa zvakajairika curves, nepo thermistor curves inosiyana nemugadziri. Tichakurukura izvi zvakadzama muTermistor sarudzo yekufambisa chikamu chechinyorwa chino.
Vagadziri vemitambo vanogadzirwa kubva kune zvigadzirwa, kazhinji ceramics, polymers, kana semiconducducsors (kazhinji mesimbi oxides) uye simbi yakachena (platinum, nictinl, kana ndarira). Vagadziri vanokwanisa kuona kupisa kwakachinja nekukurumidza kupfuura rtds, kupa mhinduro nekukurumidza. Naizvozvo, vanyori vanowanzoshandiswa ne sensors mune yakaderera mutengo, saizi diki, kukwikwidza kwakakwirira, mitezo yekuvakira, kana kutonhora kwechienzi, kana kutonhora kwechienzi, zvinangwa. Zvikumbiro.
Muzviitiko zvakawanda, NTC Ormisters inoshandiswa kune chaiyo tembiricha chiyero, kwete ptc thermisristters. Vamwe vePTC vanoripo vanokwanisa kushandiswa mumatunhu ekudzivirira ekudzivirira kana sekushandisirwa resetties yekuchengetedza maficha. Iyo yekudziya-tembiricha yekudziya yePTC yePTC inoratidza dunhu diki risati rasvika Mumamiriro ezvinhu akawandisa, iyo ptc thermistor ichaunza kuzvidzora kwakasimba apo tembiricha yekudziya yanyanya, uye kupokana kwayo kuchamuka zvakanyanya, izvo zvichaderedza mari iripo kuhurongwa, nekudaro kudzivirira kukuvara. Iyo switching point yePTC ORMISISTOR Chinyorwa ichi chinotarisa paNTC vanoremedza, izvo zvinogona kuwanda kana kuongorora kupisa kubva pa -80 ° C kusvika + 150 ° C. NTC Ormisters ine Ristance ratings kubva kune mashoma ohms kusvika gumi ma pa pa12 ° C. Sezvinoratidzwa muPi. 1, Shanduko yekupokana ne degree celsius yerermisthors inonyanya kutaurwa kupfuura yekupikisa thermometers. Kuenzaniswa neVermisistors, iyo yekukwira yakanyanya kuwanda uye kukwikwidza kwakanyanya kukosha kuchirisa kutenderera kwayo, senge 3-waya kana 4-waya, yekutsiva kutungamira kuramba. Iyo yekugadzira iyo yekugadzira inoshandisa chete iyo yakapusa 2-Wire gadziriso.
Yakakwira-chaiyo Aurmistor-based tembiricha chiyero chinoda chaizvo chiratidzo chekugadzirisa, Analog-to-to-to-tender, uye muripo, sezvakaratidzwa muPi. 2.
Kunyangwe ketani rechiratidzo rungaratidzika kunge rakareruka, kune kuoma kwakati kunokanganisa saizi, mutengo, uye kuita kweiyo mwari werebhodhi. Adi's precision adc portfolio inosanganisira akati wandei akabatanidzwa mhinduro, senge ad7124-4 / Ad7 Nekudaro, pane matambudziko akasiyana siyana mukugadzira uye optimizing thermistor-based tembiricha yekuyera mhinduro.
Chinyorwa ichi chinokurukura imwe neimwe yenyaya idzi uye inopa mazano ekuodza ivo uye nekuwedzera kurerutsa maitiro ekugadzira maitiro akadai.
Kune akasiyana siyanaNTC ThermisistersPamusika nhasi, saka kusarudza iyo yekurudyi yedhorobha kuti application yako inogona kuve basa rinotyisa. Ziva kuti vanyori vanyoreswa nekukosha kwavo kusaziva, ndiko kudzivisa kwavo kusaziva pa 25 ° C. Naizvozvo, a pegumi negumi negumi ine kusaziva kudzikisira kwe10 kω na 25 c. Vagadziri vanomisikidza kana kudzikisira kwekushora tsika kubva kune mashoma ohms kusvika gumi. Vagadziri vezvipfuyo zvekuramba ratings Vagadziri vane simba repamusoro ratings vanogona kumira tembiricha kusvika mazana matatu ° C.
Iyo yeiyo thermistor element yakagadzirwa nembeu yesimbi. Vagadziri vanowanikwa mubhora, radial uye smd maumbirwo. Thermistor beads its epoxy coated kana girazi rakatarisana nekuwedzera kuchengetedzwa. Epoxy coated bhora thermisters, radial uye pamusoro maheti akakodzera kupisa kusvika pa150 ° C. Girazi Bead thermisshors dzakakodzera kuyera kupisa kwakanyanya. Marudzi ese ejasi / kurongedza zvakare kudzivirira kubva kuuto. Vamwe vanomhanya vacho vanozovawo hupombwe hwekuwedzera kuchengetedza munzvimbo dzine hutsinye. Bead thermiscors ine nguva yekukurumidza kupindura pane radial / smd thermisters. Nekudaro, ivo havana kusimba. Naizvozvo, mhando yeTermistor inoshandiswa zvinoenderana nekupedzisira application uye nharaunda umo The Thermistor iri. Kugadzikana kwenguva refu kwekutyaira kunoenderana nezvinhu zvaro, kurongedza, uye dhizaini. Semuenzaniso, ipox-coated NTC Thermistor inogona kuchinja 0.2
Thermisthors inouya mukujeka kwakasiyana. Yakajairika thermiscors kazhinji ine chokwadi che0,5 ° C kusvika 1.5 ° C. Iyo Thermistor Ristance Rating uye Beta kukosha (chiyero che25 ° C kusvika 50 ° C / 85 ° C) vane kushivirira. Ziva kuti iyo beta kukosha kweiyo Thermistor inosiyana nemugadziri. Semuenzaniso, 10 kω ntc thermisters kubva kune akasiyana magadziri achange aine akasiyana beta tsika. Kuti uwane mamwe maitiro akakodzera, vanomermisters vakadai seOmega ™ 44XXX yakatevedzana inogona kushandiswa. Ivo vane chokwadi che 0,1 ° C kana 0,2 ° C pamusoro pe tembiricha ye 0 ° C kusvika 70 ° C. Naizvozvo, huwandu hwe tembiricha dzinogona kuyerwa uye kurongeka kwacho kwakatambira pamusoro pekuti tembiricha yekupisa inosarudza kana vanoremedza vakakodzera iyi application. Ndokumbira utarise kuti iyo yakakwira iyo chaiyo yeOmega 44xxx yakatevedzana, iyo yepamusoro mutengo.
Kuti ushandise kuramba kuDeldies Celsius, iyo beta kukosha inowanzo kushandiswa. Iyo beta kukosha inotsanangurwa nekuziva iyo tembiricha maviri ekupisa uye inoenderana kudzikisira pane imwe neimwe tembiricha.
RT1 = tembiricha kuramba 1 rt2 = tembiricha kuramba 2 t1 = tembiricha 1 (k) t2 = tembiricha 2 (k)
Mushandisi anoshandisa iyo beta kukosha kuri pedyo zvakanyanya kune tembiricha yakashandiswa mune chirongwa. Vazhinji Thermistor Datasheets vanonyora beta kukosha pamwe nekushivirira kupokana ku25 ° C uye kushivirira kweiyo beta kukosha.
Yakakwirira chaiyo thermisters uye yakakwirira chaiyo yekubvisa mhinduro dzakadai seiyo Omega 44XXX Series Shandisa iyo Steinhart-Hart equation yekushandura kudzikisira kumadhigirii celsius. Equation 2 inoda kuti vatange vatatu a, b, uye c, zvakare yakapihwa neye sensor mugadziri. Nekuti iyo equation coefficients inogadzirwa uchishandisa matatu tembiricha mapoinzi, iyo yekukonzeresa kuenzanisa kukanganisa kwakaunzwa neLinefordation (kazhinji 0.02 ° C).
A, b uye c idzo constants inotorwa kubva kumativi matatu tembiricha. R = thermistor kuramba muHOms t = tembiricha mu kgrees
PaPigi. 3 inoratidza kufarirwa kwazvino kweiyo sensor. Dhiraivha iripo inoiswa kune iyo Thermistor uye iyo yakafanana iripo inoiswa kune chaiyo inodzivirira; Rudzidziso chairwo rinoshandiswa serevo yekuyerwa. Kukosha kweiyo Reference Upomeri kunofanirwa kunge kwakakura kupfuura kana kuenzana nekukosha kwakanyanya kweiyo Thermistor kuramba (zvichienderana nekudziya kwakaderera muhurongwa hwehurongwa).
Paunenge uchisarudza iyo yekunakisa iripo, kupokana kwakanyanya kweiyo thermistor inofanira zvakare kuenderana. Izvi zvinovimbisa kuti voltage pane sensor uye iyo Refermy Ridor inogara iri pachiyero chinogamuchirika kune magetsi. Iyo munda wazvino sosi inoda imwe musoro kana kubuda kunoenderana. Kana iyo thermistor ine yakanyanya kuramba pane yakaderera yekuyera tembiricha, izvi zvichaguma neyakaderera drive iripo. Naizvozvo, voltage yakagadzirwa mhiri kweiyo thermistor pakukwirira kwakanyanya idiki. Zvirongwa zvechirongwa kuwana matanho anogona kushandiswa kugadzirisa kuyerwa kweaya madiki madiki masaini. Nekudaro, kuwana kunofanirwa kuve kwakarongedzwa zvine simba nekuti chiratidzo chechiratidzo kubva muimba inosiyana kwazvo nekushisa.
Imwe sarudzo ndeyekuisa mari asi kushandisa dynamic drive razvino. Naizvozvo, seganho rekusangana kubva kuimba yekufambisa, iyo drive razvino kukosha inoshanduka zvine simba kuitira kuti voltage yakawedzera kuyambuka iyo Thermistor iri mukati meiyo yakatarwa yekuisa yeiyo yemagetsi kifaa. Mushandisi anofanira kuve nechokwadi chekuti voltage yakakudziridzwa kuyambuka rondedzero inoenderana zvakare iri pachiyero chinogamuchirika kune magetsi. Zvisarudzo zvese zviri zviviri zvinoda huwandu hwakakwira hwekutonga, kugara uchiona voltage mhiri kweiyo thermistor kuitira kuti magetsi anogona kuyera chiratidzo. Pane sarudzo iri nyore here? Funga nezve ruzha rwekuuraya.
Kana Dc dc voltage inoiswa kune iyo Thermistor, iyo iripo kuburikidza neiyo thermistor zviyero zvoga sekushomeka kwaTermistor kwaanochinja. Zvino, kushandisa preciisior kuyera kupesana pane chirevo, chinangwa chayo ndechekuverenga mafambiro aripo kuburikidza newareristor, nokudaro achibvumira muimbi akarwisa kuti averenge. Sezvo iyo drive voltage ichishandiswawo seAdc Reference Signal, hapana fundo nhanho inodiwa. Iyo processor haina basa rekutarisa iyo Thermistor voltage, kusarudzika kana chiratidzo chechiratidzo chinogona kuyerwa nemagetsi, uye kuverenga iyo drive kuwana / kukosha kwazvino kunoda kugadziridzwa. Iyi ndiyo nzira inoshandiswa muchinyorwa chino.
Kana iyo thermistor ine diki yekupikisa chiyero uye kuramba range, voltage kana kufarirwa izvozvi kunogona kushandiswa. Mune ino kesi, dhiraivha iripo uye kuwana inogona kugadziriswa. Nekudaro, dunhu richaratidzwa mumufananidzo 3 Mukuwedzera, kuzvidzora kweiyo thermistor inoderedzwa.
Voltage Kubudirira kunogona kushandiswawo kune vanomisikidza neyakaderera kuramba ratings ratings. Nekudaro, mushandisi anofanira kugara achiona kuti zvazvino kuburikidza neiyo sensor haina kunyanya kukwirira kune sensor kana application.
Voltage Kubvumidza Kurerutsa Kushandisa Kana Uchishandisa Thermistor ine hombe yekupikisa chiyero uye yakasarudzika tembiricha. Kureba kusarudzika kuramba kunopa huwandu hunogamuchirika hwekutarwa razvino. Nekudaro, vagadziri vanofanirwa kuve nechokwadi chekuti zviripo zviri panguva inogamuchirika pamusoro peiyo tembiricha yekupisa inotsigirwa nechishandiswa.
Sigma-Delta Adcs anopa akati wandei zvakanakira kana kuronga chiyero cheTermistor chiyero system. Kutanga, nekuti iyo Sigma-Delta Adc Resmles The Analog Input, yekunze kuchengetwa kunochengetwa kune zvishoma uye izvo chete zvinodiwa kuti rc filter. Ivo vanopa shanduko mumhando yefaira uye kubuda baud rate. Yakavakwa-muDhijiteri Dhijituru inogona kushandiswa kudzvinyirira chero kukanganiswa mune mains powered. 24-bit midziyo yakadai seiyo ad7124-4 / ad7124-8 ine zvizere kugadziriswa kusvika 21.7 mabheti, saka vanopa resolution yakakwirira.
Iko kushandiswa kweiyo Sigma-Delta Adc kurerutsa kwazvo iyo iyo dhizaini yekugadzira iyo uchideredza kutaurwa, system mutengo, nzvimbo yebhodhi, uye nguva yekutengesa.
Chinyorwa ichi chinoshandisa ad7124-4 / ad7124-8 seyakaderera ruzha, yakaderera zviripo, muzvirevo zvePga, zvakavakirwa,
Pasinei nekuti uri kushandisa drive razvino kana drive voltage, iyo ratiometric inogadziriswa inokurudzirwa kuti iyo Reference voltage uye sensor voltage vanobva kune imwecheteyo drive sosi. Izvi zvinoreva kuti chero shanduko muzvinhu zvinowoneka hazvizokanganisa chokwadi cheyero.
PaPigi. 5 Inoratidza kufambira mberi kwechiitiko zvazvino kune iyo Thermistor uye chaiyo inodzivisa rref, iyo voltage yakawedzera kuyambuka rref ndiyo rref ndiyo reference yekuyera muurayi.
Iyo parizvino haina kufanira kuve yakarurama uye inogona kunge yakaderera seyakakanganisika mumunda wazvino ichabviswa mune ino gadziriso. Kazhinji. Rudzi urwu rwe bias nzira inowanzo shandiswa rtds kana thermisters ine yakaderera kuramba tsika. Nekudaro, kune mujaya ane huwandu hwepamusoro hwekurwisa kukosha uye kukwirira kwepamusoro, chikamu chechiratidzo chinogadzirwa nekuchinja kwega kwega kuchave kwakakura, saka kufararira kweLopage kunoshandiswa. Semuenzaniso, a wegumi negumi negumi ane kupokana kwegumi k king na25 c. At -50 ° C, kuramba kweiyo NTC Thermistor is 441.117 kω. Iyo shoma drive iripo ye50 μA yakapihwa neAd7124-4 / Ad7124-8 Zvikamu Vagadziwo vanowanzobatanidzwa kana kuwanikwa padhuze nemagetsi, saka kusadzivirirwa kuti vatore mari hazvidikanwe.
Kuwedzera rondedzero yerudzi muhurukuro sedunhu rekuvanzika kugovera kunogumira iyo yazvino kuburikidza neimba yeimba yekuenda kuimba yayo shoma yekudzivisa. Mukugadziriswa uku, kukosha kweiyo pfungwa yekupokana kwetsvina kunofanirwa kuve kwakaenzana nekukosha kwekudziya kwekutenderera kwechiitiko chegumi neshanu. " Sezvo tembiricha ichichinja, kupokana neimba yeNTC zvakare inoshanduka, uye chiyero chevatambi voltage mhiria chinochinja zvakare, zvichikonzera kuti muvhemo unoburitsa mukupokana kweiyo NTC Thermistor.
Kana iyo yakasarudzwa voltage rejista yakashandiswa simba uye / kana rtsonse inoenderana neiyo adc Reference inoshandiswa kuyerwa
Cherekedza kuti kana iyo Sense Sristor (Voltage inotyairwa) kana iyo Refermor preshor
Paunenge uchishandisa akawanda anrermisters, imwe chete voltage inogona kushandiswa. Nekudaro, mumwe nemumwe aya anofanirwa kuve nekunyatsojeka pfungwa yekupokana, sezvakaratidzwa muPi. 8. Imwe sarudzo ndeyekushandisa iyo yekunze yakawanda-yekuwedzera kana yakaderera-kuramba switch mune iyo, iyo inobvumira kugovera imwe pfungwa yekupokana. Nekugadziriswa uku, yega yega Thermistor inoda imwe nguva yekugadzirisa kana yakayerwa.
Mukupfupikisa, paunenge uchigadzira iyo yekudyara-tembiricha yekuongorora maitiro, pane mibvunzo yakawanda yekufunga, sensor yekusarudza kutengeserana-offes, uye kuti izvi zvakasiyana-siyana zvinoshanduka zvine chekuita nekujeka kwakazara kwehurongwa. Chinyorwa chinotevera munhevedzano ino chinotsanangura maitiro ekugadzirisa yako system dhizaini uye yakazara system yekukanganisa bhajeti kuti uwane yako chinangwa chinangwa.
Kutumira Nguva: Sep-30-2022