Overvoltage tiv thaiv txoj cai rau hloov cov khoom siv fais fab
Surge protectors yog tsim los tiv thaiv 220 / 380V cov khoom siv hluav taws xob tsawg thiab yog cov khoom siv tsis muaj kab. Raws li IEC cov qauv, surge protectors yog cov cuab yeej uas feem ntau suppress overvoltage thiab overcurrent hauv cov kab sib kis. Surge protectors ua lub luag haujlwm tiv thaiv, thiab qhov yuav tsum tau ua hauv paus yog tias lawv yuav tsum tiv thaiv qhov kev cia siab ntawm xob laim tam sim no dhau los, thiab tua hluav taws xob ntau zaus tam sim no tsim tom qab xob laim ntws los ntawm qhov siab tshaj plaws voltage clamp ntawm qhov surge, txwv qhov tam sim no overvoltage nkag. cov kab hluav taws xob thiab cov teeb liab kis tau tus mob nyob rau hauv qhov hluav taws xob ntau yam uas cov khoom siv los yog lub cev muaj peev xwm tiv taus, los yog tso tawm cov hluav taws xob muaj zog tam sim no rau hauv av, tiv thaiv cov cuab yeej tiv thaiv lossis kev puas tsuaj los ntawm kev cuam tshuam.
Hom thiab cov qauv ntawm surge protectors sib txawv nyob ntawm seb lawv xav siv, tab sis tsawg kawg yog ib qho nonlinear voltage limiting element yuav tsum suav nrog. Cov khoom tiv thaiv kev tiv thaiv muaj xws li MOV (Hlau Oxide Varistor) thiab cov roj tso tawm. Surge muaj lub zog muaj zog thiab tiv thaiv tsis tau. Vim li no, lub tswv yim los tiv thaiv cov khoom siv hluav taws xob tsis zoo los ntawm kev puas tsuaj yog los hloov cov surge ntawm cov khoom siv thiab ntws mus rau hauv av.
Lub surge protector MOV muaj peb ntu: cov khoom siv hlau oxide nyob rau hauv nruab nrab, uas txuas nrog lub hwj huam mov thiab hauv av xaim los ntawm ob lub semiconductors. Thaum qhov tshwm sim tshwm sim, MOV tam sim ntawd qhib nrog lub sijhawm teb ntawm 1-3 nanoseconds. Lub "V" nyob rau hauv MOV yog ib tug kuj sib txawv resistor. Thaum lub sijhawm teb, qhov kev tiv thaiv ntawm MOV poob los ntawm nws cov nqi siab tshaj plaws rau yuav luag xoom ohms, thiab overcurrent ntws mus rau hauv av los ntawm MOV. Cov khoom siv hluav taws xob tiv thaiv txuas ntxiv ua haujlwm ntawm qhov kev ua haujlwm ib txwm muaj. Nws cov semiconductor Cheebtsam muaj cov cuab yeej ntawm kev hloov tsis kam nrog voltage variation. Thaum qhov hluav taws xob qis dua tus nqi tshwj xeeb, kev txav ntawm electrons hauv semiconductor ua rau muaj kev tiv thaiv siab. Ntawm qhov tsis sib xws, thaum qhov hluav taws xob ntau tshaj qhov tshwj xeeb no, lub zog ntawm cov hluav taws xob yuav hloov, thiab cov khoom siv hluav taws xob yuav txo qis zero ohms. Qhov hluav taws xob yog qhov qub, thiab lub zog tiv thaiv MOV yog nyob rau sab, uas tsis cuam tshuam rau cov kab hluav taws xob.
Cov cim qhia ntawm qhov zoo thiab qhov tsis zoo ntawm qhov kim tshaj plaws surge protector MOV: (1) Clamping voltage: sawv cev rau tus nqi hluav taws xob uas yuav ua rau MOV txuas rau hauv av xaim. Qhov qis dua qhov clamping voltage, qhov kev tiv thaiv zoo dua. (2) Lub zog nqus / dissipation muaj peev xwm: Qhov nominal tus nqi sawv cev ntau npaum li cas lub zog tiv thaiv tuaj yeem nqus tau ua ntej hlawv tawm, hauv joules. Qhov siab dua nws cov nqi, qhov kev tiv thaiv zoo dua. (3) Lub sij hawm teb: Kev tiv thaiv kev tiv thaiv yuav tsis cuam tshuam tam sim ntawd, thiab yuav muaj kev ncua me ntsis hauv lawv cov lus teb rau kev nce siab.
Lwm cov cuab yeej tiv thaiv kev tiv thaiv hluav taws xob yog lub raj xa hluav taws xob. Cov roj tso tawm cov raj no muaj qhov ua haujlwm zoo ib yam li MOVs, vim tias lawv txav dhau tam sim no los ntawm cov xaim nyob rau hauv av xaim los ntawm kev siv cov roj inert ua tus neeg xyuas pib ntawm ob lub xov hlau. Thaum qhov hluav taws xob nyob rau hauv ib qho tshwj xeeb, qhov sib xyaw ntawm cov roj txiav txim siab tias nws yog tus neeg xyuas pib tsis zoo. Yog hais tias qhov hluav taws xob surges thiab tshaj qhov no, qhov kev siv ntawm tam sim no yuav txaus ionize cov pa, ua rau cov pa tawm tube yog ib tug zoo heev conductor. Nws yuav ua tam sim no rau hauv av kom txog thaum qhov hluav taws xob rov qab mus rau qhov qub, thiab tom qab ntawd dhau los ua tus neeg xyuas pib tsis zoo dua.
