Kev tiv thaiv tsim qauv raws li LED tswj kev hloov hluav taws xob
LED switching fais fab mov overcurrent tiv thaiv Circuit Court, LED switching fais fab mov overvoltage tiv thaiv Circuit Court, LED switching fais fab mov muag muag pib tiv thaiv Circuit Court, LED switching fais fab mov overheating tiv thaiv Circuit Court... Insiders pab txhawb ob peb lub tswv yim Circuit Court daim duab, thiab ua hauj lwm zoo nyob rau hauv kev tiv thaiv tsim ntawm LED hloov fais fab mov nrog koj.
LED switching fais fab mov overcurrent tiv thaiv Circuit Court
Nyob rau hauv DC LED switching fais fab mov Circuit Court, thiaj li yuav tiv thaiv lub hloov raj los ntawm raug hlawv thaum lub Circuit Court yog luv luv thiab tam sim no nce. Cov txheej txheem yooj yim yog tias thaum cov zis tam sim no tshaj li ib qho txiaj ntsig, lub raj hloov kho yog nyob rau hauv lub xeev tsis ncaj ncees lawm, kom nws raug txiav tawm thiab cov hluav taws xob tam sim no tau txiav tawm. Raws li pom nyob rau hauv daim duab 1, lub overcurrent tiv thaiv Circuit Court muaj ib tug triode BG2 thiab voltage dividing resistors R4 thiab R5.
Thaum lub voj voog ua haujlwm ib txwm muaj, lub hauv paus peev xwm ntawm BG2 yog siab dua li qhov muaj peev xwm emitter los ntawm qhov kev ua haujlwm ntawm R4 thiab R5, thiab cov emitter junction bears qhov rov qab voltage. Yog li BG2 yog nyob rau hauv lub xeev txiav tawm (sib npaug rau ib qho qhib Circuit Court), uas tsis muaj kev cuam tshuam rau voltage regulator circuit. Thaum lub Circuit Court yog luv luv, qhov tso zis voltage yog xoom, thiab lub emitter ntawm BG2 yog sib npaug rau hauv av, ces BG2 yog nyob rau hauv ib tug saturated conduction xeev (sib npaug rau ib tug luv luv Circuit Court), thiaj li hais tias lub hauv paus thiab emitter ntawm lub hloov raj. BG1 nyob ze rau qhov luv luv, thiab nyob rau hauv lub xeev txiav tawm. Txiav tawm lub voj voog tam sim no kom ua tiav lub hom phiaj ntawm kev tiv thaiv.
LED switching fais fab mov overvoltage tiv thaiv Circuit Court
Kev tiv thaiv overvoltage ntawm switching regulator nyob rau hauv DC LED switching fais fab mov muaj xws li input overvoltage tiv thaiv thiab output overvoltage tiv thaiv. Yog tias qhov hluav taws xob tsis raug cai DC fais fab mov (xws li roj teeb thiab lub tshuab hluav taws xob) siv los ntawm kev hloov hluav taws xob hloov hluav taws xob siab dhau lawm, nws yuav ua rau lub tshuab hluav taws xob hloov hluav taws xob tsis ua haujlwm ib txwm, thiab txawm tias cov khoom siv sab hauv puas. voltage tiv thaiv Circuit Court.
Kev tiv thaiv Circuit Court muaj xws li transistors thiab relays. Nyob rau hauv lub Circuit Court no, thaum lub voltage ntawm lub input DC fais fab mov yog siab tshaj qhov puas voltage tus nqi ntawm lub Zener diode, lub Zener diode tawg, thiab ib tug tam sim no ntws los ntawm lub resistor R, ua rau lub transistor T mus rau lub relay. ua, qhov ib txwm kaw kev sib cuag qhib, thiab cov tswv yim raug txiav tawm. Lub polarity tiv thaiv Circuit Court ntawm cov khoom siv hluav taws xob tuaj yeem ua ke nrog cov khoom siv hluav taws xob tiv thaiv hluav taws xob los tsim cov cim tiv thaiv polarity thiab overvoltage tiv thaiv Circuit Court.
LED switching fais fab mov mos pib tiv thaiv Circuit Court
Lub voj voog ntawm kev hloov hluav taws xob tswj hluav taws xob yog qhov nyuaj, thiab cov khoom siv hluav taws xob ntawm lub tshuab hloov hluav taws xob feem ntau txuas nrog lub tshuab lim tawm nrog me me inductance thiab lub peev xwm loj. Thaum lub sij hawm ntawm lub hwj chim-on, lub lim capacitor yuav ntws ib tug loj surge tam sim no, uas yuav ua tau ob peb zaug ib txwm input tam sim no. Xws li qhov loj inrush tam sim no tuaj yeem yaj cov kev sib cuag ntawm lub zog hloov pauv lossis cov kev sib cuag ntawm lub relay thiab tshuab lub fuse input. Tsis tas li ntawd, surge tam sim no tuaj yeem ua rau cov capacitors puas, ua rau lawv lub neej luv thiab ua rau lawv ua tsis tiav. Vim li no, tus tam sim no-txheej resistor yuav tsum tau txuas nrog thaum pib, thiab lub capacitor yuav raug them los ntawm qhov tam sim no-txheej resistor. Txhawm rau kom tsis txhob ua rau tam sim no limiting resistor siv ntau lub zog, txhawm rau cuam tshuam rau kev ua haujlwm ib txwm muaj ntawm kev hloov pauv, lub relay yog siv los txiav luv luv-circuit nws tom qab pib ua haujlwm ib ntus dhau lawm, thiaj li hais tias lub relay yog siv los txiav luv luv-circuit nws tom qab pib ua haujlwm dhau los, DC fais fab mov ncaj qha xa hluav taws xob mus rau lub tshuab hloov hluav taws xob. , Qhov Circuit Court no hu ua "soft start" circuit of DC LED switching power supply.
