Relays ua tsis tau sai dua li lawv cov ntaub ntawv cog lus. Qhov no yog ib qho teeb meem tshwm sim thiab kim heev. Nws tshwm sim hauv kev tswj hwm kev lag luam, automation systems, thiab txawm tias cov haujlwm ua haujlwm siab tshaj. Lub ntsiab culprit feem ntau yog ib tug uas ntsiag to killer: hluav taws xob arcing hla cov neeg.
Qhov kev cuam tshuam ntxov ntxov no tsis tas yuav tshwm sim. Txoj kev daws teeb meem yog nkag siab thiab siv cov cuab yeej siv hluav taws xob zoo.
Phau ntawv qhia no muab rau koj ua tiav, kev piav qhia ntawm cov txheej txheem tseem ceeb rau kev tiv thaiv kev tiv thaiv kev tiv thaiv. Peb mam li npog cov kev tshawb fawb tom qab hluav taws xob arcing. Tom qab ntawd peb yuav tshawb xyuas yuav ua li cas siv flyback diode circuits, RC snubber tsim, thiab Hlau Oxide Varistors (MOVs). Thaum kawg, koj yuav paub yuav ua li cas kuaj xyuas qhov ua tsis tiav thiab tsim cov hluav taws xob muaj zog uas ua kom lub neej ntev ntev.
Vim li cas Relay Contacts Fail
Txhawm rau kho qhov teeb meem, peb yuav tsum nkag siab txog physics ua ntej. Tiv tauj tiv thaiv yaig pib nrog kev paub yuav ua li cas relay hu tawg thiab ua tsis tiav. Qhov no degradation yog kwv yees. Nws los ntawm cov hluav taws xob thiab cov neeg kho tshuab kev ntxhov siab thaum lub sij hawm thauj khoom hloov. Nkag siab txog cov txheej txheem no yog koj thawj kauj ruam mus rau kev tiv thaiv zoo.
Hu rau qhib thiab kaw
Ib tug relay yog ib tug electromechanical hloov. Thaum koj energize nws coil, ib tug magnetic teb txav ib armature. Qhov no ua rau cov neeg raug kaw los yog qhib, ua kom tiav lossis tawg lub voj voog. Qhov no tshwm sim hauv milliseconds.
Qhov kev txiav txim zoo li yooj yim. Tab sis cov xwm txheej hluav taws xob ntawm qhov chaw sib cuag yog qhov nyuaj thiab muaj feem cuam tshuam. Qhov no muaj tseeb tshwj xeeb tshaj yog thaum hloov inductive loads. Motors, solenoids, li qub, thiab lwm yam relay coils tsim cov kev nyuaj no.
Nkag siab txog Hluav Taws Xob Arcing
Ib qho hluav taws xob arc yog ib qho ionized plasma channel heev. Nws tsim thaum qhov hluav taws xob ntawm ob lub conductors tau siab txaus los rhuav tshem huab cua lub zog dielectric. Xav txog kev qhib relay hu nrog qhov sib txawv voltage ntawm lawv.
Thaum ib tug relay txiav tam sim no mus rau ib qho inductive load, lub collapsing magnetic teb tsim ib tug loj voltage spikes. Qhov no yog hu rov qab -EMF. Spike muaj opposite polarity rau cov khoom voltage. Nws tuaj yeem ncav cuag ntau pua lossis ntau txhiab volts, deb tshaj qhov kev khiav hauj lwm voltage. Qhov no high voltage ignites lub puas arc raws li kev sib cuag.
Rov qab hluav taws xob arcing ua rau muaj kev puas tsuaj loj:
Hu rau Pitting thiab Erosion: Lub arc qhov kub siab tshaj mus txog ntau txhiab degrees Celsius. Nws cia vaporizes me me ntawm cov khoom sib cuag. Qhov no tsim cov pits me me thiab craters, ua rau qhov chaw sib cuag.
Kev Hloov Khoom: Thaum lub sij hawm arcing, molten hlau txav ntawm ib qho kev sib cuag mus rau lwm qhov. Qhov no tsim ib qho "pip" ntawm ib qho kev sib cuag thiab qhov sib txuam "crater" ntawm lwm qhov. Qhov tshwm sim yog qhov tsis zoo, siab -kev tiv thaiv kev sib txuas thiab qhov kawg tsis ua tiav.
Hu rau Vuam: Nyob rau hauv siab - daim ntawv thov tam sim no lossis cov xwm txheej arcing hnyav, kev sib cuag tau kub txaus kom yaj thiab fuse ua ke. Lub welded relay tsis ua haujlwm nyob rau hauv lub xeev "rau" mus tas li. Qhov no tuaj yeem ua rau muaj kev puas tsuaj rau koj qhov system tswj.
Oxidation thiab Carbonization: High arc kub ua kom cov tshuaj tiv thaiv nrog cov huab cua nyob ib puag ncig. Qhov no ua rau cov txheej txheem ntawm cov hlau oxides thiab cov pa roj carbon deposits ntawm qhov chaw sib cuag. Kev tiv thaiv kev tiv thaiv nce ntau, ua rau overheating thiab tsis ua hauj lwm.
Resistive vs. Inductive Loads
Hloov cov khoom hnyav hnyav, zoo li cov khoom cua sov yooj yim, yooj yim dua ntawm kev sib cuag relay. Thaum koj qhib lub Circuit Court, qhov hluav taws xob hla cov neeg sib cuag tsuas yog nce mus rau qib voltage. Qhov no feem ntau tsis txaus los pib qhov tseem ceeb arc.
Inductive loads khaws lub zog hauv magnetic teb. Tam sim ntawd, uncontrolled tso tawm lub zog khaws cia thaum lub sij hawm switching generates puas voltage spikes. Qhov no ua rau arc suppression tseem ceeb rau kev tsim.
Txoj Cai Tswjfwm Ntiag Tug
Taming lub txim yog hais txog kev tswj lub zog. Lub hauv paus ntsiab lus tseem ceeb tsis tas yuav tiv thaiv qhov tawg tag. Nws yog hais txog kev tswj lub zog loj tso tawm los ntawm inductive loads.
Lub hom phiaj yog muab lwm txoj hauv kev, kev nyab xeeb rau kev khaws cia lub zog kom ploj mus. Es tsis txhob cia nws ua phem tawm raws li ib tug arc hla qhib relay hu.
Kev Txhaum Cai Li Cas
Kev txwv ib qho arc txhais tau hais tias nquag tswj qhov hluav taws xob thiab tam sim no ntawm kev sib cuag relay thaum hloov. Peb xav tiv thaiv cov xwm txheej uas tso cai rau arcs tsim thiab txhawb nqa lawv tus kheej.
Koj ua tiav qhov no los ntawm kev muab tam sim no los ntawm qhov sib nqus sib nqus ua kom yooj yim dua. Es tsis txhob yuam nws txoj kev hla qhov sib txawv ntawm huab cua, lub zog hloov mus rau hauv ib qho kev tiv thaiv tshwj xeeb. Nyob ntawd nws dissipates harmlessly, feem ntau raws li ib tug me me ntawm tshav kub.
Ob Lub Tswv Yim Tseem Ceeb
Muaj ob lub tswv yim tseem ceeb rau kev tiv thaiv arc. Feem ntau cov kev tiv thaiv circuits siv ib los yog ob qho tib si mus kom ze.
Clamping qhov Voltage: Qhov no txwv qhov siab tshaj plaws voltage spikes thoob plaws kev sib cuag mus rau theem kom nyab xeeb hauv qab huab cua sib txawv voltage. Yog tias qhov hluav taws xob tsis tau siab txaus, arcs tsis tuaj yeem tsim. Cheebtsam zoo li Zener diodes thiab MOVs feem ntau muab voltage clamping.
Kev hloov pauv tam sim no: Qhov no muab txoj hauv kev qis - impedance rau khaws cia lub zog inductive thaum muaj kev sib cuag qhib. Tam sim no diverts deb ntawm qhov kev sib cuag, dissipating nyob rau lub sij hawm ntev nyob rau hauv ib qho kev tivthaiv. Flyback diode circuits thiab RC snubber circuits yog cov piv txwv tseem ceeb.
DC Load Protection
Rau kev tiv thaiv kev sib cuag relay uas hloov DC inductive loads, flyback diode yog qhov kev daws teeb meem tshaj plaws. Nws yog qhov yooj yim, siv tau, thiab qhov tseem ceeb rau kev ua kom lub neej ntev hauv DC circuits nrog solenoids, motors, thiab relay coils.
Yuav Ua Li Cas Flyback Diode Ua Haujlwm
Lub flyback diode, tseem hu ua lub freewheeling diode, txuas nyob rau hauv parallel nrog lub inductive load. Critically, koj nruab nws nyob rau hauv thim rov qab - kev tsis ncaj ncees kev taw qhia txheeb ze rau lub hwj chim polarity.
Ntawm no yog cov kab ke:
Relay Kaw: Thaum lub sijhawm ua haujlwm ib txwm muaj, tam sim no ntws los ntawm DC cov khoom siv los ntawm kev sib txuas sib txuas thiab inductive load. Lub diode yog thim rov qab-kev ncaj ncees thiab tsis coj. Nws muaj txiaj ntsig zoo tsis pom ntawm lub voj voog.
Relay Qhib: Cov kev sib txuas tam sim no qhib, txoj kev tam sim no tawg. Sib nqus teb nyob rau hauv load coil pib collapsing, inducing siab -voltage back-EMF ntawm opposite polarity.
Diode Conducts: Qhov thim rov qab no -polarity voltage spike tam sim no rau pem hauv ntej- biases flyback diode. Lub diode tam sim ntawd ua, tsim ib lub voj kaw rau tam sim no los ntawm lub load coil thiab diode nws tus kheej.
Qhov tam sim no "freewheels" lossis "yav rov qab" los ntawm lub voj. Nws muaj kev nyab xeeb dissipates khaws cia sib nqus zog raws li cov cua sov hauv lub kauj winding tsis kam thiab qhov hluav taws xob me me poob thoob plaws lub diode. Voltage spike hla relay hu clamps rau lub diode rau pem hauv ntej voltage (feem ntau ~ 0.7V rau 1V). Qhov no tsawg dhau los pib qhov arc.
Txhawm rau ua qhov no, txuas lub diode lub cathode (sab feem ntau cim nrog ib pawg) mus rau sab zoo ntawm DC muab kev sib txuas ntawm lub load. Txuas lub anode mus rau sab tsis zoo.
Xaiv txoj cai Diode
Xaiv qhov tsim nyog flyback diode yog ncaj nraim. Koj yuav tsum xav txog peb yam tseem ceeb.
Forward Tam sim no (Yog tias): Lub diode qhov kev ntsuas txuas ntxiv mus rau tam sim no yuav tsum sib npaug lossis tshaj qhov ruaj khov- lub xeev tam sim no rub los ntawm cov khoom inductive. Xaiv ib lub diode nrog kev ntsuam xyuas uas yooj yim tshaj qhov load tam sim no.
Peak Repetitive Reverse Voltage (VRRM): Lub diode qhov rov qab qhov ntsuas hluav taws xob yuav tsum tshaj qhov hluav taws xob hluav taws xob. Ib qho kev nyab xeeb yam tsawg kawg yog 2x yog kev coj ua zoo. Rau 24V DC circuits, diode nrog VRRM ntawm 50V lossis siab dua (zoo li 1N4001) yog qhov kev xaiv zoo heev.
Diode Ceev (trr): Rau feem ntau cov ntawv thov electromechanical relay, uas hloov maj mam, tus qauv rectifier diodes zoo li 1N400x series ua haujlwm zoo kawg nkaus. Txawm li cas los xij, yog tias koj hloov pauv ntawm cov khoom siv siab nrog cov khoom siv hauv lub xeev (xws li PWM rau kev tswj xyuas lub cev muaj zog), koj yuav tsum tau ceev- rov qab los yog Schottky diodes kom ceev txaus tig - rau.
Lub Tig -Off Time Trade- tawm
Qhov yooj yim flyback diode muaj ib qho tseem ceeb drawback: nws nce load de{0}}energization lub sij hawm. Vim hais tias tam sim no circulates ntev dua, lub magnetic teb collapses qeeb dua.
Rau relays lossis contactors, qhov no txhais tau hais tias armatures tso qeeb dua. Rau cov solenoid li qub, li qub yuav siv sijhawm ntev dua los kaw. Hauv ntau daim ntawv thov, qhov kev ncua me ntsis (feem ntau tsuas yog kaum milliseconds) tsis yog qhov teeb meem. Tab sis nyob rau hauv siab -ceev los yog lub sij hawm- tseem ceeb systems, koj yuav tsum xav txog nws. Lub Zener diode nyob rau hauv series nrog flyback diode tuaj yeem ua kom lub zog tawg, tab sis qhov no ntxiv qhov nyuaj rau kev tsim ntau dua.
AC Load Protection
Kev tiv thaiv kev sib cuag hauv AC circuits yog qhov nyuaj dua li DC circuits. Ib qho yooj yim diode yuav tsis ua hauj lwm, raws li nws yuav tsim ib tug luv luv Circuit Court thaum ib nrab ntawm AC voj voog. Hloov chaw, peb cia siab rau ob yam tseem ceeb: RC snubber circuit thiab Hlau Oxide Varistor (MOV).
Lub RC Snubber Circuit Court
RC snubber muaj ntau yam thiab siv tau rau kev tiv thaiv arc hauv ob qho tib si AC thiab DC circuits. Tab sis nws yog qhov mus- daws rau AC inductive loads. Nws muaj ib tug resistor thiab capacitor txuas nyob rau hauv series. Qhov R-C network txuas nrog rau qhov sib npaug nrog cov khoom uas koj xav tiv thaiv- feem ntau yog cov neeg sib txuas lus.
RC snubber ua haujlwm tseem ceeb dual:
Limits Voltage Rise (dV / dt): Thaum qhib kev sib cuag relay, lub capacitor muab txoj hauv kev pib tam sim no. Qhov no tiv thaiv qhov hluav taws xob thoob plaws kev sib cuag los ntawm kev nce tam sim ntawd, muab kev sib cuag ntau lub sijhawm rau lub cev sib cais. Los ntawm qeeb voltage nce tus nqi (dV / dt), nws tiv thaiv qhov hluav taws xob los ntawm kev ncav cuag arcing peev xwm ua ntej qhov sib chwv sib kis loj txaus los tiv thaiv nws.
Limits Inrush Tam sim no: Thaum cov neeg sib txuas lus kaw, lub capacitor (uas yuav raug them) tawm los ntawm lawv. Lub series resistor yog qhov tseem ceeb ntawm no. Nws txwv qhov kev tso tawm tam sim no mus rau qib kev nyab xeeb. Yog tsis muaj tus resistor, instantaneous tam sim no spike los ntawm lub capacitor yuav loj txaus rau weld relay hu kaw.
Ib Daim Ntawv Qhia Txog Tswv Yim Snubber Design
Txawm hais tias tus qauv tsim tshwj xeeb snubber tuaj yeem koom nrog cov kev suav ua nyuaj raws li cov khoom thauj inductance thiab kev tsis txaus ntseeg, txoj cai zoo -tsim cai- ntawm - tus ntiv tes xoo ua haujlwm tau zoo tshwj xeeb rau kev siv dav dav - lub hom phiaj.
Nov yog ib kauj ruam -los ntawm- cov txheej txheem rau RC snubber tsim qauv:
Xaiv tus Resistor (R): Raws li qhov pib, siv kwv yees li 1 Ohm ib qho kev tiv tauj volt. Rau 120V AC circuits, ib qho resistor nyob ib ncig ntawm 100-120 Ohms yog qhov zoo. Rau 240V AC circuits, pib nrog 220-240 Ohms. Xaiv tus qauv resistor tus nqi ze ntawm koj qhov kev suav.
Xaiv lub Capacitor (C): Ib txoj cai feem ntau yog 0.1 microfarads (µF) ib amp ntawm load tam sim no. Rau 2A load, 0.22 µF capacitor yuav tsim nyog.
Suav Resistor Power Rating (P): Lub resistor yuav tsum dissipate lub zog nws absorbs thaum lub sij hawm txhua lub voj voog. Kev kwv yees rau lub zog tuaj yeem suav nrog P ≈ C × V², qhov C yog qhov muaj peev xwm hauv Farads thiab V yog RMS kab hluav taws xob. Rau 120V circuits nrog 0.1µF capacitors, lub zog yuav yog (0.1 × 10⁻⁶) × 120²=1.44 W. Ib txwm xaiv cov resistors nrog lub zog ntsuas tsawg kawg ob npaug ntawm koj cov nqi suav rau kev nyab xeeb thiab kev ua haujlwm ntev. Hauv qhov no, 3W lossis 5W resistors yuav tsim nyog.
Xaiv Capacitor Voltage Rating: Qhov no yog qhov tseem ceeb rau kev nyab xeeb. Lub capacitor yuav tsum tau ntsuas tshwj xeeb rau kev siv AC kab. Nrhiav "X-type" kev nyab xeeb capacitor. Qhov ntsuas hluav taws xob yuav tsum siab dua li cov kab hluav taws xob. Rau 120V AC kab, siv cov capacitors ntsuas rau tsawg kawg 250V AC. Rau 240V AC kab, kev ntsuas ntawm 400V AC lossis, feem ntau, 630V DC yuav tsum tau.
Ib tus kws tshaj lij-cov lus qhia los ntawm kev paub: Ib txwm siv tsis yog-inductive resistors rau koj snubers. Tus qauv xaim- cov kab mob tiv thaiv muaj lawv tus kheej inductance, uas tuaj yeem cuam tshuam nrog kev ua haujlwm snubber thiab txo qhov ua tau zoo. Carbon muaj pes tsawg leeg, carbon zaj duab xis, los yog hlau zaj duab xis resistors yog nyiam xaiv.
Cov Hlau Oxide Varistor (MOV)
Lub Hlau Oxide Varistor (MOV) yog qhov hluav taws xob - nyob ntawm tus resistor. Nws ua raws li ib tug qhib Circuit Court ntawm ib txwm ua hauj lwm voltages. Tab sis nws dhau los ua tus neeg xyuas pib thaum qhov hluav taws xob hla nws tshaj nws qhov ntsuas "clamping voltage."
MOVs yog qhov zoo tshaj plaws rau clamping loj, ceev, siab -lub zog hloov pauv. Cov no muaj xws li xob laim ntaus lossis loj inductive load hloov ntawm tib txoj kab hluav taws xob. Lawv feem ntau txuas ua ke nrog cov khoom thauj lossis hla AC fais fab kab nkag mus rau ib lub cuab yeej.
Lub ntsiab MOV txwv yog hais tias nws yog ib tug sacrificial tivthaiv. Txhua zaus nws absorbs ib ntus, nws cov qauv sab hauv degrades me ntsis. Nyob rau lub sijhawm thiab tom qab ntau qhov xwm txheej, nws cov clamping voltage poob. Nws thiaj li ua tsis tau, feem ntau raws li luv luv Circuit Court. Vim li no, ib txwm siv nws nrog lub fuse lossis Circuit Court breaker. Xav tias nws yog ib tug brute - quab yuam ib ntus absorber es tsis yog ib tug zoo -tuned arc suppression ntaus ntawv zoo li ib tug snubber.
Xaiv Txoj Kev Zoo
Nrog rau ntau qhov kev xaiv muaj, xaiv txoj kev tiv thaiv tsim nyog yuav zoo li nyuaj. Qhov kev xaiv nyob ntawm koj daim ntawv thov: hom thauj khoom (AC / DC, qib inductance) thiab cov hom phiaj tiv thaiv tshwj xeeb. Lub moj khaum no yuav pab koj txiav txim siab txog engineering.
Kev sib piv ntawm txoj kev tiv thaiv
Cov lus no muab kev sib piv meej ntawm peb lub ntsiab lus uas tau tham txog.
|
Txoj kev |
Kev siv thawj zaug |
Qhov chaw |
Pros |
Cons |
Zoo tshaj rau |
|
Flyback Diode |
DC Inductive Loads |
Nyob rau hauv parallel nrog load |
Yooj yim heev, siv tau zoo, tus nqi qis |
DC circuits nkaus xwb, qeeb load tig -tawm |
DC solenoids, DC motors, relay coils |
|
RC Snubber |
AC / DC Loads |
Nyob rau hauv parallel nrog hu los yog load |
Ua haujlwm ntawm AC, tunes dV / dt, txo EMI |
Ntau tus qauv tsim, tuaj yeem muaj cov dej xau tam sim no |
General AC inductive loads, motors, transformers |
|
MOV |
AC / DC Transients |
Nyob rau hauv parallel nrog kab los yog load |
Absorbs siab heev zog, ceev ceev |
Degrades dhau lub sij hawm, cov khoom fij |
Tiv thaiv cov kab hluav taws xob sab nraud |
Tiag -Lub Ntiaj Teb Scenarios
Cia peb siv qhov kev paub no rau cov xwm txheej engineering.
Scenario 1: Tswj lub 24V DC solenoid valve.
Kev pom zoo: Siv lub flyback diode. Tus qauv 1N4004 diode tso ncaj qha hla lub solenoid ob lub terminals (nrog cathode rau +24V) yog qhov yooj yim tshaj plaws, pheej yig tshaj, thiab zoo tshaj. Nws yuav thim rov qab tag nrho -EMF thiab tiv thaiv cov neeg sib txuas lus.
Scenario 2: Hloov lub twj tso kua mis 120V AC nrog 3A tam sim no kos.
Kev pom zoo: Ib qho RC snubber hla kev sib txuas lus yog qhov zoo tagnrho. Siv peb phau ntawv qhia, peb yuav pib nrog 120 Ohm resistor thiab 0.33µF capacitor (0.1µF ib amp). Lub zog resistor yuav xav tau kev xam thiab kev ruaj ntseg oversizing. Txhawm rau kom muaj zog ntxiv, MOV tuaj yeem txuas thoob plaws AC kab pub rau tag nrho lub thawv tswj hwm los tiv thaiv sab nraud surges.
Scenario 3: Lub microcontroller's 5V logic pin tsav tsheb 12V relay.
Kev Pom Zoo: Qhov xwm txheej no muaj ob lub ntsiab lus tiv thaiv. Ua ntej, 12V relay coil nws tus kheej yog DC inductive load. Ib lub flyback diode (xws li 1N4148 lossis 1N4001) yuav tsum txuas hla lub relay kauj los tiv thaiv tus tsav tsheb transistor lossis IC los ntawm lub kauj rov qab -EMF. Qhov thib ob, txawm li cas los xij ntawm qhov kev hloov pauv hloov pauv (AC lossis DC) yuav tsum muaj nws tus kheej kev tiv thaiv tsim nyog (snubber, MOV, lossis lwm yam flyback diode) los tiv thaiv cov neeg sib cuag lawv tus kheej.
Feem ntau yuam kev kom zam
Ntau xyoo ntawm kev paub dhau los qhia ntau yam yuam kev hauv kev siv kev tiv thaiv kev tiv thaiv. Kev zam lawv yog qhov tseem ceeb raws li kev xaiv cov khoom tsim nyog.
Tsis txhob muab lub flyback diode hla AC load lossis AC relay coil. Nws yuav ua raws li ib tug rectifier thiab tsim ib tug luv luv Circuit Court nyob rau hauv ib nrab ntawm lub AC voj voog. Qhov no rhuav tshem lub diode thiab tej zaum yuav ua rau lub fuse los yog puas lub hwj chim mov.
Tsis txhob hnov qab lub series resistor nyob rau hauv ib tug RC snubber. Lub capacitor tso ncaj qha hla kev sib cuag yuav ua rau loj heev, instantaneous inrush tam sim no thaum muaj kev sib cuag. Qhov no yog ntau tshaj qhov muaj peev xwm ntawm welding lawv kaw rau thawj zaug ua haujlwm.
Tsis txhob undersize qhov kev ntsuam xyuas cov khoom. Ib tug snubber resistor nrog tsis txaus lub zog ntsuas yuav overheat thiab poob. Ib tug snubber capacitor nrog tsawg voltage ntsuas yuav tawg thiab tsis luv luv. Ib txwm siv cov npoo kev nyab xeeb tseem ceeb.
Tsis txhob tso cov hluav taws xob tiv thaiv kom deb ntawm qhov chaw hloov pauv. Rau qhov ua tau zoo tshaj plaws, cov khoom tiv thaiv yuav tsum nyob ze li sai tau rau cov khoom tiv thaiv lawv. Txoj cai ntawm load terminals rau diodes los yog txoj cai ntawm relay hu rau snubers. Cov xov hlau ntev ntxiv inductance thiab tuaj yeem txo qhov kev ua haujlwm hauv Circuit Court.
Lub tsev rau lub neej ntev
Kev siv arc suppression tsis yog xaiv tau. Nws yog ib feem tseem ceeb ntawm kev tsim hluav taws xob muaj zog thiab txhim khu kev qha. Lub zog puas tsuaj ntawm uncontrolled inductive kick yog thawj qhov laj thawj rau kev ua tsis tiav ntxov ntxov. Raws li peb tau pom, cov kev daws teeb meem yog ob qho tib si siv tau thiab siv tau.
Los ntawm kev nkag siab qhov ua rau ntawm kev yaig thiab kev siv kev tiv thaiv kom raug -flyback diodes rau DC loads, RC snubbers rau AC loads, los yog MOVs rau ib ntus surges -koj tuaj yeem txav mus dhau qhov kev ntxhov siab ntawm kev ua tsis tiav.
Cov tswv yim no txhawb koj los tsim cov tshuab uas tsis yog ua haujlwm xwb tab sis kuj siv tau ntev. Siv sij hawm los ntxiv ob peb yam yooj yim yog kev nqis peev me me. Nws them cov nyiaj faib loj hauv kev ntseeg tau thiab txhim kho qhov kev ncua sij hawm ntawm relay lifespan.
Puas siab - lub hwj chim twj tso kua mis controllers siv AC contactors los yog relays?
Kev xaiv ntawm nruab nrab relays rau industrial automation PLC txee
Puas yog lub hauv paus relay ntawm qhov chaw them nqi ib txwm qhib lossis kaw?
Txoj kev xaim rau nruab nrab relay nyob rau hauv qhov sib thooj hloov tswj Phau Ntawv Qhia