Ukuvikelwa kwezinga lokushisa kwezimoto kanye nesilinganiso sokushisa

Ukusetshenziswa kwe-PTC Thermistor

 

2. Ukuvikelwa kokulayisha ngokweqile kwe-PTC thermistor

I-thermistor ye-PTC yokuvikela ukugcwala kakhulu iyingxenye yokuvikela evikela ngokuzenzakalelayo futhi ilulame emazingeni okushisa angavamile namandla angajwayelekile, ngokuvamile aziwa ngokuthi “i-fuse ehlelwa kabusha” kanye “ne-fuse yezikhathi eziyizinkulungwane eziyishumi”. Ithatha indawo yamafusi endabuko futhi ingasetshenziswa kabanzi ukuvikela ukudlula ngokweqile kanye nokushisa ngokweqile kwamamotho, ama-transformer, ukushintshanisa amandla kagesi, amasekhethi kagesi, njll. inani lamanje elisele.

I-fuse yendabuko ayikwazi ukuzitholela ngokwayo ngemva kokushaywa kolayini, futhi i-thermistor ye-PTC yokuvikela ukulayisha ngokweqile ingabuyiselwa esimweni sokuvikela ngaphambi kokususwa kwephutha, futhi umsebenzi wayo wokuvikela ngokweqile nokushisa ungabonakala lapho iphutha lenzeka futhi. .Khetha i-thermistor ye-PTC ukuze uvikeleke kakhulu njengengxenye yokuvikela ukushisa okudlulele. Okokuqala, qinisekisa ukusebenza okujwayelekile okujwayelekile komugqa (okungukuthi, amandla amanje angasebenzi we-PTC thermistor yokuvikela ukugcwala) kanye nendawo yokufaka i-PTC thermistor yokuvikela ukulayisha ngokweqile (ngesikhathi sokusebenza okuvamile). ) Izinga lokushisa eliphakeme kakhulu le-ambient, lilandelwa yi-current protection (okungukuthi, ukusebenza kwamanje kwe-thermistor ye-PTC ukuze kuvikelwe ukugcwala ngokweqile), i-voltage ephezulu yokusebenza, isilinganiso sokumelana namandla ayiziro, nezici ezifana nobukhulu bezingxenye kufanele nazo. kucatshangelwe.

Umgomo wohlelo lokusebenza

Lapho isifunda sisesimweni esivamile, ukudlula kwamanje ku-thermistor ye-PTC ukuze kuvikelwe ukulayisha ngokweqile kungaphansi kwamanje okulinganiselwe, futhi i-thermistor ye-PTC yokuvikela ukulayisha ngokweqile isesimweni esivamile, enenani elincane lokumelana, elingeke lithinte ukusebenza okuvamile kwesifunda esivikelwe.

Uma isifunda sihluleka futhi i-current idlula kakhulu i-current rated, i-thermistor ye-PTC yokuvikela ukulayisha ngokweqile ishisa ngokuzumayo futhi isesimweni sokumelana okuphezulu, okwenza isifunda sibe sesimweni "sokucisha", ngaleyo ndlela sivikela isifunda emonakalweni.Lapho iphutha liqedwa, i-thermistor ye-PTC yokuvikela ukugcwala ngokweqile iphinde ibuyele ngokuzenzakalelayo esimweni sokumelana okuphansi, futhi isifunda siqala ukusebenza okuvamile.

3. Ukuvikela ukushisa ngokweqile kwe-PTC thermistor

Izinga lokushisa le-Curie lenzwa ye-PTC thermistor lisuka ku-40 liye ku-300°C. Kujika lesici se-RT senzwa ye-thermistor ye-PTC, ukukhuphuka okuphakeme kwevelu yokumelana ngemva kokungena endaweni yoshintsho kungasetshenziswa njengezinga lokushisa, ileveli yoketshezi, kanye nenzwa yokugeleza. isicelo. Ngokwezici ezizwela izinga lokushisa zama-thermistors e-PTC, iklanyelwe ukusetshenziselwa ukuvikela ukushisa ngokweqile kanye nezikhathi zokuzwa izinga lokushisa, futhi isetshenziswa ekushintsheni amandla kagesi, izinto zikagesi (amamotho, iziguquli), izisetshenziswa zamandla (ama-transistors). Ibonakala ngosayizi omncane kanye nesikhathi sokuphendula esisheshayo. , Kulula ukufaka.

Umehluko phakathi kwe-PTC ne-KTY:I-Siemens isebenzisa i-KTY

Okokuqala, ziwuhlobo lwedivayisi yokuvikela izinga lokushisa;

I-PTC ukumelana ne-coefficient yokushisa enhle, okungukuthi, inani lokumelana liyakhula njengoba izinga lokushisa likhuphuka;

Okunye ukuthi i-NTC iyi-resistor eguquguqukayo ene-coefficient yezinga lokushisa elibi, futhi inani lokumelana liyancipha njengoba izinga lokushisa likhuphuka, futhi alisetshenziselwa ukuvikelwa kwemoto okuvamile.I-KTY inokunemba okuphezulu, ukwethembeka okuphezulu nokuzinza okuqinile.Isetshenziswa kakhulu emkhakheni wokulinganisa izinga lokushisa.I-KTY imbozwe ungqimba lwe-silicon dioxide insulating material, imbobo yensimbi enobubanzi obungu-20mm ivulwa kungqimba lwe-insulating, futhi lonke ungqimba olungezansi lwenziwe ngensimbi ngokuphelele.Ukusatshalaliswa kwamanje okukhishwa kusuka phezulu kuya phansi kutholakala ngokuhlelwa kwamakristalu, ngakho-ke kubizwa ngokuthi ukumelana nokusabalalisa.I-KTY ine-coefficient esebenzayo yomugqa wokushisa okungaphakathi kulo lonke uhla lokulinganisa izinga lokushisa, ngaleyo ndlela iqinisekisa ukunemba kwesilinganiso sokushisa okuphezulu.

I-PT100 ye-platinamu ukumelana nokushisa iklanywe futhi yakhiwe ngokusebenzisa isimiso esiyisisekelo sokuthi inani lokumelana nocingo lweplatinamu liyashintsha ngokushintsha kwezinga lokushisa. ) kanye no-100 ohms (inombolo yokuthweswa iziqu i-Pt100), njll., ububanzi bokulinganisa izinga lokushisa ngu-200~850 ℃. Isici esizwa izinga lokushisa se-10 ohm platinum thermal resistance senziwa ngocingo lweplatinamu olushubile, futhi ukusebenza kokumelana nezinga lokushisa kuhle kakhulu. 100 ohm platinum ukumelana ezishisayo, inqobo nje uma isetshenziswa endaweni lokushisa ngenhla 650 ℃: 100 ohm platinum ukumelana ezishisayo isetshenziswa ikakhulukazi endaweni lokushisa ngezansi 650 ℃, nakuba ingasetshenziswa endaweni lokushisa ngenhla 650 ℃, kodwa endaweni yokushisa engaphezu kuka-650 ℃ amaphutha Ekilasi A awavunyelwe. Ukulungiswa kokumelana nokushisa kweplatinamu okungu-100 ohm kukhulu ngokuphindwe ka-10 kune-10 ohm ukumelana nokushisa kweplatinamu, futhi izimfuneko zamathuluzi esibili ziwuhlelo lobukhulu obuhambisanayo. Ngakho-ke, ukumelana nokushisa kweplatinamu okungu-100 ohm kufanele kusetshenziswe ngokusemandleni ukuze kulinganiswe izinga lokushisa endaweni engaphansi kuka-650 °C.