Raws li cov qauv tsim los tiv thaiv LED hloov hluav taws xob
LED switching power supply over-current tiv thaiv circuit, LED switching power supply over-voltage protection circuit, LED switching power supply soft-start protection circuit, LED switching power supply overheating tiv thaiv circuit ...... kev lag luam sab hauv los pab txhawb rau ntau lub tswv yim daim duab kos duab, nrog koj ua txoj haujlwm zoo hauv kev tiv thaiv tsim ntawm LED hloov hluav taws xob.
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 regulator raj nyob rau hauv lub luv luv Circuit Court, qhov tam sim no nce tsis txhob hlawv. Cov txheej txheem yooj yim yog, thaum cov zis tam sim no dhau ntawm tus nqi ib txwm, lub raj hloov kho yog nyob rau hauv lub xeev tsis ncaj ncees lawm, thiab txiav tawm, txiav tawm qhov tam sim no. Raws li pom nyob rau hauv daim duab 1, lub overcurrent tiv thaiv Circuit Court muaj transistor BG2 thiab voltage divider resistors R4 thiab R5.
Circuit Court ib txwm ua haujlwm, los ntawm lub siab ntawm R4 thiab R5, ua rau lub hauv paus ntawm BG2 muaj peev xwm tshaj qhov emitter muaj peev xwm yog siab, lub emitter hlws ris tiv thaiv qhov rov qab voltage. Yog li BG2 nyob rau hauv lub xeev txiav tawm (sib npaug rau qhib Circuit Court), tsis muaj kev cuam tshuam rau lub voltage regulator circuit. Thaum lub Circuit Court yog luv luv, qhov tso zis voltage yog xoom, lub emitter ntawm BG2 yog sib npaug rau hauv av, ces BG2 yog saturated conduction xeev (sib npaug rau ib tug luv luv Circuit Court), thiaj li hais tias tus regulator BG1 puag thiab emitter nyob ze ntawm luv luv Circuit Court, thiab yog nyob rau hauv lub xeev txiav tawm, txiav tawm tam sim no Circuit Court, thiaj li ua tiav lub hom phiaj ntawm kev tiv thaiv.
LED switching fais fab mov overvoltage tiv thaiv Circuit Court
DC LED switching fais fab mov switching regulator overvoltage tiv thaiv nrog rau input overvoltage tiv thaiv thiab tso zis overvoltage tiv thaiv. Yog hais tias lub switching regulator siv los ntawm unregulated DC fais fab mov (xws li roj teeb thiab rectifiers) yog hais tias lub voltage yog siab dhau heev lawm, yuav ua rau lub switching regulator tsis ua hauj lwm zoo, los yog tej yam kev puas tsuaj rau cov khoom siv sab hauv, yog li ntawd LED switching fais fab mov. yuav tsum tau siv lub input overvoltage tiv thaiv Circuit Court.
Daim duab 3 rau lub transistor thiab relay tiv thaiv Circuit Court, nyob rau hauv lub Circuit Court, thaum lub input DC fais fab mov voltage yog siab tshaj lub breakdown voltage ntawm tus regulator diode tus nqi, lub regulator breakdown, muaj ib tug tam sim no ntws los ntawm lub resistor R, thiaj li hais tias tus nqi ntawm cov regulator diode. transistor T conductive, relay nkaus, feem ntau kaw kev sib cuag, txiav tawm cov tswv yim. 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 tiv thaiv overvoltage Circuit Court.
LED switching fais fab mov mos pib tiv thaiv Circuit Court
Switching tswj fais fab mov Circuit Court yog ntau complex, cov tswv yim ntawm lub switching regulator feem ntau txuas nrog ib tug me me inductor, loj capacitor input lim. Thaum lub sijhawm hloov mus, lub lim capacitor yuav ntws qhov loj inrush tam sim no, lub inrush tam sim no tuaj yeem ua tau ntau zaus ntawm cov khoom siv tam sim no. Xws li lub siab inrush tam sim no tuaj yeem yaj cov kev sib cuag ntawm lub zog hloov pauv lossis relay thiab tshuab cov khoom siv fuse. Tsis tas li ntawd, inrush tam sim no tuaj yeem ua rau cov capacitors puas, txo lawv lub neej ntev thiab ua rau muaj kev puas tsuaj ntxov ntxov. Vim li no, ib qho kev txwv tam sim no yuav tsum tau txuas nrog ntawm kev hloov pauv, los ntawm qhov uas tus capacitor raug them. Txhawm rau kom tsis txhob ua rau tam sim no limiting resistor siv lub zog ntau dhau, thiaj li tsis cuam tshuam rau kev ua haujlwm ib txwm muaj ntawm kev hloov hluav taws xob, thiab thaum kawg ntawm cov txheej txheem hluav taws xob hloov pauv, siv lub relay los txiav luv luv, thiaj li hais tias qhov kawg ntawm lub hwj chim-on txheej txheem, siv lub relay los txiav luv luv. DC fais fab mov ncaj qha mus rau qhov hloov hluav taws xob tswj hluav taws xob, qhov Circuit Court no hu ua DC LED hloov fais fab mov "soft start" circuit.
LED switching fais fab mov overheating tiv thaiv Circuit Court
DC LED switching fais fab mov nyob rau hauv lub switching regulator ntawm siab integration thiab lub teeb yuag me me ntim, thiaj li hais tias lub hwj chim ceev nyob rau hauv ib chav tsev ntim tau zoo heev, yog li yog hais tias lub hwj chim mov khoom Cheebtsam nyob rau hauv lub chaw ua hauj lwm qhov kub thiab txias qhov yuav tsum tau yog tsis sib xws, yuav inevitably ua rau cov khoom siv hluav taws xob. Circuit Court ua haujlwm tsis zoo, ua tsis tiav ntxov ntawm cov khoom. Yog li ntawd, nyob rau hauv lub high-power DC LED switching fais fab mov yuav tsum tau teem overheating tiv thaiv Circuit Court.
