Switching Power Supply Surge Protection Txoj Cai
SurgeProtectiveDevice, SPD, tseem hu ua surge protector, yog ib qho khoom siv tiv thaiv uas tsis yog-linear siv los txwv tsis pub dhau ib ntus overvoltage thiab qhia tawm surge tam sim no hauv cov tshuab nyob, thiab siv los tiv thaiv hluav taws xob lossis hluav taws xob uas tsis tshua muaj hluav taws xob los ntawm kev sib tsoo thiab kev puas tsuaj. los ntawm xob laim electromagnetic pulse los yog kev khiav hauj lwm overvoltage. Nyob rau hauv xyoo tas los no, cov ntaub ntawv hluav taws xob (xws li TV, xov tooj, kev sib txuas lus, computer network, thiab lwm yam) tau tsim sai heev, thiab cov khoom siv hluav taws xob ntau tau tshwm sim thiab nrov. Xws li cov tshuab thiab cov cuab yeej siv feem ntau kim thiab tseem ceeb, thiab lawv cov kev ua haujlwm voltage thiab tiv taus qhov hluav taws xob tsawg heev, yog li lawv tsis tshua muaj kev cuam tshuam rau xob laim hluav taws xob pulses. Yog li, SPD yuav tsum muaj rau kev tiv thaiv hluav taws xob.
Vim yog cov qauv sib txawv ua raws li ntau lub teb chaws, cov khoom specifications tsis sib koom ua ke, thiab cov kev qhia txog kev ntsuas kuj tseem muaj nws tus kheej, uas yog qhov qis dua rau lwm cov khoom siv hluav taws xob tshwj xeeb, uas ua rau tsis yooj yim rau kev tsim thiab xaiv. Hauv kev tsim qauv engineering, hom hom tuaj yeem muab faib ua cov khoom siv hauv tsev, cov khoom lag luam nyob sab Europe thiab Asmeskas cov khoom raws li qhov chaw ntawm keeb kwm. Cov kev teeb tsa ntawm cov khoom siv hauv tsev yog chaotic, nrog ntau yam specifications thiab siab residual siab. Qee tus qauv teeb tsa ntawm cov khoom lag luam ua raws li cov khoom lag luam European, thiab qee qhov ua raws li lub teb chaws calibration tsis. Feem ntau ntawm cov khoom raug cim nrog In thiab Imax. Txij li cov khoom siv hauv tsev muaj qhov xav tau qis rau cov chaw thov, qib tsev qis, thiab cov khoom siv loj tuaj yeem tiv taus qhov ntsuas hluav taws xob, qee qhov kev txwv tsis pub tuaj yeem ua kom haum.
Cov khoom lag luam nyob sab Europe feem ntau khij qhov siab tshaj plaws tawm tam sim no, thiab cov qauv khoom kuj tau teeb tsa raws li qhov ntsuas no. Piv txwv li, XXX65 thiab XXX40 ntawm ib lub npe nrov European, tus nqi 65 thiab 40 yog Imax. Txawm li cas los xij, Suav tus qauv qhia meej meej tias qhov kev tso tawm tam sim no nyob rau hauv yuav tsum tau siv rau hom kev xaiv, uas yog qhov teeb meem txaj muag uas tau ntsib hauv engineering tsim tam sim no. Tom qab kuaj xyuas cov ntaub ntawv ntawm cov khoom, tus nqi ntawm XX65 tsis tshaj 20kA, thiab hauv tus nqi ntawm XX40 tsis tshaj 15kA. Raws li tus nqi pom zoo ntawm GB50343, ob yam khoom no tsuas yog siv tau rau kev tiv thaiv thib peb ntawm cov khoom siv davhlau ya nyob twg, tab sis nyob rau hauv qhov tseeb tsim, lawv tau nruab rau theem thawj thiab thib ob, uas yog pom tseeb tsis sib haum nrog cov kev xaiv. ntawm lub teb chaws tus qauv, thiab cov residual voltage siab dua, cov qauv zoo tib yam feem ntau tshaj 1200V, ib zaug ib puag ncig thaiv tsis zoo, nws yog ib qho yooj yim kom dhau qhov voltage tus nqi ntawm cov khoom siv. Feem ntau, Uc tus nqi ntawm cov khoom nyob sab Europe yog me me, thiab cov kab hluav taws xob yog opportunistically cim, yog li nws yog ib qho yooj yim kom to taub yuam kev thaum xaiv tus qauv.
Classification ntawm surge protectors
SPD yog ib qho khoom siv tseem ceeb hauv kev tiv thaiv xob laim ntawm cov khoom siv hluav taws xob. Nws txoj haujlwm yog txhawm rau txwv qhov tam sim no overvoltage uas nkag mus rau hauv txoj 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 lossis lub kaw lus tuaj yeem tiv taus, lossis xau hluav taws xob muaj zog rau hauv av. , los tiv thaiv cov cuab yeej tiv thaiv lossis qhov system los ntawm kev cuam tshuam.
Muab faib los ntawm txoj cai ua haujlwm
Raws li nws txoj haujlwm ua haujlwm, SPD tuaj yeem muab faib ua hom hloov hluav taws xob, hom kev txwv voltage thiab hom sib xyaw.
(1) Voltage hloov hom SPD. Nws nthuav tawm cov impedance siab thaum tsis muaj hluav taws xob tam sim no, thiab thaum nws teb rau xob laim tam sim no overvoltage, nws impedance mam li nco dheev hloov mus rau qis impedance, tso cai rau xob laim tam sim no dhau los, tseem hu ua "short-circuit switch type SPD".
(2) Siab-limiting SPD. Thaum tsis muaj tam sim no overvoltage, nws yog siab impedance, tab sis nrog rau qhov nce ntawm surge tam sim no thiab voltage, nws impedance yuav txo qis, thiab nws cov yam ntxwv tam sim no-voltage muaj zog nonlinear, qee zaum hu ua "clamp SPD".
(3) Ua ke SPD. Kev sib xyaw ua ke ntawm voltage-switching thiab voltage-limiting Cheebtsam uas tuaj yeem pom qhov voltage-switching lossis voltage-limiting lossis ob yam ntxwv, nyob ntawm seb tus yam ntxwv ntawm qhov siv hluav taws xob.
Kev faib tawm los ntawm lub hom phiaj
Raws li nws txoj kev siv, SPD tuaj yeem muab faib ua ob hom: kab hluav taws xob SPD thiab kab teeb liab SPD.
(1) Cov kab hluav taws xob SPD
Txij li thaum lub zog ntawm xob laim hluav taws xob loj heev, nws yog ib qho tsim nyog yuav tsum tso lub zog ntawm xob laim tawm mus rau hauv av ib kauj ruam los ntawm cov txheej txheem ntawm hierarchical tso tawm. Nyob rau hauv qhov chaw tiv thaiv hluav taws xob ncaj qha (LPZ0A) lossis ntawm qhov chaw sib tshuam ntawm thaj chaw tiv thaiv hluav taws xob ncaj qha (LPZ0B) thiab thawj thaj chaw tiv thaiv (LPZ1), nruab ib lub surge protector lossis ib tug voltage-limiting surge protector uas tau dhau qhov Class I classification test raws li thawj thawj theem ntawm kev tiv thaiv yog tso tawm cov hluav taws xob ncaj qha tam sim no, los yog thaum lub hwj chim kis tau tus mob kab ncaj qha los ntawm xob laim, nws yuav tso tawm lub zog loj ua. Nruab ib qho hluav taws xob-txhim hluav taws xob tiv thaiv hluav taws xob ntawm qhov sib txuas ntawm txhua qhov kev faib (xws li LPZ1 cheeb tsam) tom qab thawj cheeb tsam tiv thaiv, raws li qib thib ob, thib peb lossis siab dua ntawm kev tiv thaiv. Tus tiv thaiv qib thib ob yog cov cuab yeej tiv thaiv rau qhov seem hluav taws xob ntawm tus tiv thaiv yav dhau los thiab qhov cuam tshuam ntawm xob laim hauv cheeb tsam. Thaum muaj hluav taws xob loj hluav taws xob nqus hluav taws xob tshwm sim nyob rau hauv pem hauv ntej-theem, tseem muaj ib feem uas loj heev rau cov khoom siv lossis cov neeg tiv thaiv thib peb. Lub zog yuav raug xa mus thiab yuav tsum tau ntxiv absorbed los ntawm tus tiv thaiv qib thib ob. Nyob rau tib lub sijhawm, cov kab sib kis tau dhau los ntawm thawj theem kev tiv thaiv xob laim yuav ua rau hluav taws xob hluav taws xob hluav taws xob hluav taws xob. Thaum txoj kab ntev txaus, lub zog ntawm lub zog hluav taws xob ua rau loj txaus, yuav tsum muaj tus tiv thaiv qib thib ob kom tso tawm hluav taws xob ntxiv. Tus neeg tiv thaiv qib thib peb tiv thaiv cov hluav taws xob hluav taws xob seem uas dhau los ntawm tus tiv thaiv thib ob. Raws li kev tiv thaiv hluav taws xob theem ntawm cov cuab yeej tiv thaiv, yog tias ob-theem hluav taws xob tiv thaiv tuaj yeem txwv qhov hluav taws xob qis dua li cov khoom siv hluav taws xob tiv thaiv, tsuas yog ob theem kev tiv thaiv yuav tsum tau; yog tias cov khoom siv hluav taws xob tiv taus qis qis, plaub theem lossis ntau qib kev tiv thaiv.
(2) Cov kab hluav taws xob SPD
Nrog rau kev siv dav dav ntawm cov ntaub ntawv xov xwm, vim muaj ntau ntawm cov kab sib txuas thiab qhov tsis tshua muaj hluav taws xob tiv thaiv cov khoom siv hluav taws xob, hluav taws xob hluav taws xob ntau dua thiab muaj kev phom sij rau cov ntaub ntawv xov xwm. Kev raug mob ntawm xob laim rau cov ntaub ntawv xov xwm feem ntau yog tshwm sim los ntawm xob laim hluav taws xob mem tes, suav nrog cov hluav taws xob overvoltage yoj ua raws kab, qhov muaj peev xwm tiv thaiv tau tsim los ntawm cov hluav taws xob tam sim no ntawm cov xaim hauv av, electrostatic induction thiab electromagnetic induction ntawm xob laim. electromagnetic teb. Kev tiv thaiv kev ntsuas hluav taws xob muaj xws li kev cuam tshuam, shunting, equipotential bonding, shielding, grounding, thiab tsim nyog xaim. Txhim kho SPD ntawm cov kab teeb liab yog ib qho kev ntsuas tseem ceeb rau cov ntaub ntawv xov xwm los tiv thaiv electromagnetic pulses. Nws tuaj yeem ua si lub luag haujlwm ntawm kev cuam tshuam, shunting, thiab equipotential bonding. Lub teeb liab kab SPD yuav tsum txuas nrog lub teeb liab chaw nres nkoj ntawm cov khoom tiv thaiv. Nws cov zis davhlau ya nyob twg txuas nrog rau qhov chaw nres nkoj ntawm cov cuab yeej tiv thaiv, uas tuaj yeem muab faib ua serial kev sib txuas thiab kev sib txuas ua ke, thiab feem ntau yog ntsia hauv series ntawm cov teeb liab kab. Yog li ntawd, thaum xaiv ib lub teeb liab SPD, ib tug SPD nrog ib tug me me insertion poob yuav tsum tau xaiv.
