Technical Information

1. Basic Definitions uye Working Principles

Chii chinonzi NTC Thermistor?

       ■   Tsanangudzo:A Negative Temperature Coefficient (NTC) thermistor is semiconductor ceramic component iyo kushomeka kwayo kunodzikira.exponentiallysezvo tembiricha inowedzera. Inoshandiswa zvakanyanya kuyera tembiricha, muripo wekushisa, uye inrush ikozvino kudzvinyirira.

        ■   Working Principle:Yakagadzirwa kubva kune shanduko yesimbi oxides (semuenzaniso, mangan ese, cobalt, nickel), shanduko yekushisa inoshandura kusungirirwa kwemutakuri mukati mechinhu, zvichikonzera shanduko yekuramba.

Kuenzanisa kweTemperature Sensor Types

Type	Principle	Zvakanakira	Zvakaipa
NTC	Kuramba kunosiyana nekupisa	Kunzwa kwakanyanya, mutengo wakaderera	Non-linear output
RTD	Metal resistance inosiyana nekupisa	Kururama kwepamusoro, mutsara wakanaka	Mutengo wakakwirira, mhinduro inononoka
Thermocouple	Thermoelectric effect (voltage inogadzirwa nekusiyana kwekushisa)	Yakakura tembiricha siyana (-200°C kusvika 1800°C)	Inoda kutonhora kwejunction muripo, chiratidzo chisina simba
Digital Temperature Sensor	Inoshandura tembiricha kuita digital output	Kubatanidzwa kuri nyore ne microcontrollers, yakanyanya kurongeka	Tembiricha shoma, mutengo wakakwira kupfuura NTC
LPTC (Linear PTC)	Kupikisa kunowedzera mutsara nekushisa	Yakareruka mutsara kubuda, yakanaka kune yakanyanyisa-tembiricha yekudzivirira	Kunzwa kushoma, kutetepa kwekushandisa

2. Key Performance Parameters uye Terminology

Core Parameters

       ■   Nominal Resistance (R25):

Iyo zero-simba rekudzivirira pa25°C, kazhinji kubva pa1kΩ kusvika pa100kΩ.XIXITRONICSinogona kugadzirwa kuti isangane ne0.5～5000kΩ

       ■B Kukosha (Thermal Index):

Tsanangudzo: B = (T1 · T2)/(T2-T1) · ln (R1/R2), zvichiratidza kunzwisiswa kwekupikisa kushanduka kwekushisa (chikamu: K).
                       Yakajairika B kukosha kwemhando: 3000K kusvika 4600K (semuenzaniso, B25/85=3950K)
XIXITRONICS inogona kugadzirwa kuti isangane ne2500～5000K

       ■   Kururama (Kushivirira):

Resistance value kutsauka (eg, ± 1%, ± 3%) uye tembiricha kuyerwa nemazvo (semuenzaniso, ± 0.5 ° C).
XIXITRONICS inogona kugadzirwa kuti isangane ne ± 0.2 ℃ muhuwandu hwe 0 ℃ kusvika 70 ℃, iyo yakanyanya kunaka inogona kusvika 0.05℃.

       ■Chinhu chinoparadza (δ):

Iyo parameter inoratidza kuzvidziyisa mhedzisiro, yakayerwa mumW/°C (yakaderera inoreva kudziyisa kudziyisa).

       ■Nguva inogara ( τ):

Nguva inodiwa kuti thermistor ipindure ku63.2% yekuchinja kwekushisa (semuenzaniso, 5 seconds mumvura, 20 seconds mumhepo).

Technical Terms

        ■   Steinhart-Hart Equation:

Modhi yemasvomhu inotsanangura kupikisa-tembiricha hukama hweNTC thermistors:

(T: Mhedziso tembiricha, R: Resistance, A/B/C: Constants)

       ■   α (Tembiricha Coefficient):

Chiyero chekupikisa shanduko pane yeyuniti tembiricha shanduko:

       ■   RT Tafura (Resistance-Temperature Table):

Tafura yereferensi inoratidza chiyero chekuramba patembiricha dzakasiyana, inoshandiswa kugadzirisa kana dhizaini yedunhu.

3. Mashandisirwo Akajairika eNTC Thermistors

Minda Yekushandisa

        1. Tembiricha Kuyera:

                     o   Midziyo yemumba (air conditioners, firiji), midziyo yemuindasitiri, mota (bhatiri pack/motor tembiricha yekutarisa).

       2. Tembiricha Muripo:

                     oKubhadhara kudonha kwekushisa mune zvimwe zvinhu zvemagetsi (semuenzaniso, makristasi oscillator, maLED).

       3. Inrush Current Suppression:

                     oKushandisa iyo yakanyanya kutonhora kuramba kudzikamisa inrush ikozvino panguva yekutanga simba.

Circuit Design Mienzaniso

•   Voltage Divider Circuit:

(Tembiricha inoverengerwa nekuverenga voltage kuburikidza neADC.)

       •   Linearization nzira:

Kuwedzera zvakagadziriswa resistors munhevedzano / parallel kukwidziridza iyo isiri-mutsara inobuda yeNTC (inosanganisira referensi redunhu madhayagiramu).

4. Unyanzvi Zvishandiso uye Zvishandiso

Zviwanikwa Zvemahara

•Datasheets:Sanganisira dzakadzama paramita, zviyero, uye bvunzo mamiriro.

•RT Tafura Excel ( PDF ) template: Inobvumira vatengi kuti vakurumidze kutarisa kumusoro kwekushisa-kupikisa kukosha.

•Application Notes:

                     oDhizaini Mafungiro eNTC muLithium Battery Temperature Dziviriro

                     oKuvandudza NTC Temperature Measurement Kurongeka kuburikidza neSoftware Calibration

Online Tools

       • B Kukosha Calculator:Isa T1/R1 uye T2/R2 kuverenga kukosha kweB.

       •Tembiricha Yekushandura Turusi: Input kuramba kuti uwane tembiricha inoenderana (inotsigira Steinhart-Hart equation).

5. Mazano ekugadzira (Kune Mainjiniya)

• Dzivisa Zvikanganiso zvekuzvipisa:Ita shuwa kuti kushanda kwazvino kuri pazasi pehukuru hwakatsanangurwa mudhetabheti (semuenzaniso, 10μA).

• Kuchengetedza kwezvakatipoteredza:Kunzvimbo dzine mwando kana kuita ngura, shandisa magirazi akavharidzirwa kana epoxy-coated NTCs.

• Calibration Recommendations:Kuvandudza hurongwa hwekuita nekuita kuenzanisa kwemapoinzi maviri (semuenzaniso, 0 ° C uye 100 ° C).

6.Mibvunzo Inowanzo bvunzwa (FAQ)

1. Mubvunzo: Ndeupi musiyano pakati peNTC nePTC thermistors?

                     o   A: PTC (Positive Temperature Coefficient) thermistors inowedzera kuramba nekushisa uye inowanzoshandiswa pakudzivirira kwepamusoro, nepo NTC thermistors inoshandiswa pakuyera kupisa uye kubhadhara.

2. Q: Ungasarudza sei kukosha B kwakakodzera?

                     o   A: High B values ​​(semuenzaniso, B25/85=4700K) inopa kunzwisiswa kwepamusoro uye inokodzera tembiricha yakatetepa, nepo yakaderera B kukosha (semuenzaniso, B25/50=3435K) iri nani kune yakakura tembiricha siyana.

3. Mubvunzo: Kureba kwewaya kunokanganisa kuyerwa kwechiyero here?

                     oA: Hongu, waya refu dzinounza kumwe kuramba, iyo inogona kubhadharwa nekushandisa 3-waya kana 4-waya nzira yekubatanidza.