Switching fais fab mov startup resistor nyhuv
Kev xaiv ntawm cov resistors nyob rau hauv kev hloov hom fais fab mov circuits tsis tsuas yog txiav txim siab lub hwj chim noj los ntawm qhov nruab nrab tam sim no tus nqi nyob rau hauv Circuit Court, tab sis kuj muaj peev xwm tiv taus lub siab tshaj plaws tam sim no. Ib qho piv txwv zoo yog lub zog piv txwv ntawm kev hloov MOSFET, uas txuas nrog hauv kev sib txuas ntawm kev hloov MOSFET thiab hauv av. Feem ntau, qhov kev tiv thaiv tus nqi no tsawg heev, thiab qhov siab tshaj qhov poob qis tsis tshaj 2V. Nws zoo nkaus li tsis tsim nyog siv lub zog hluav taws xob siab raws li kev siv hluav taws xob, tab sis xav txog lub peev xwm los tiv thaiv qhov siab tshaj plaws tam sim no ntawm kev hloov MOSFET, qhov tam sim no amplitude yog ntau dua li cov nqi ib txwm nyob rau lub sijhawm pib. Nyob rau tib lub sijhawm, kev ntseeg siab ntawm cov resistor kuj tseem ceeb heev. Yog tias nws tau qhib vim muaj kev cuam tshuam tam sim no thaum lub sijhawm ua haujlwm, lub tshuab hluav taws xob siab sib npaug sib npaug ntawm cov khoom siv hluav taws xob ntxiv rau qhov rov qab ncov voltage yuav raug tsim los ntawm ob lub ntsiab lus ntawm cov ntawv luam tawm Circuit Board qhov twg cov resistor nyob, thiab nws yuav tawg. Nyob rau tib lub sijhawm, kev sib koom ua ke ntawm IC ntawm lub overcurrent tiv thaiv Circuit Court kuj yuav tawg. Vim li no, 2W hlau zaj duab xis resistor feem ntau xaiv rau qhov resistor no. Hauv qee cov khoom siv hluav taws xob hloov pauv, 2-4 1W resistors yog siv nyob rau hauv tib lub sijhawm, tsis yog los ua kom lub zog tawg, tab sis muab kev ntseeg tau. Txawm hais tias ib qho resistor qee zaus puas lawm, muaj ob peb lwm tus kom tsis txhob muaj qhov tshwm sim ntawm qhib Circuit Court. Ib yam li ntawd, qhov piv txwv tsis kam ntawm cov zis hluav taws xob ntawm lub zog hloov hluav taws xob kuj tseem ceeb heev. Thaum qhov kev tawm tsam tau qhib, qhov ntsuas hluav taws xob yog xoom volts, thiab PWM nti tawm cov mem tes uas nce mus txog nws tus nqi siab tshaj plaws, ua rau muaj kev nce ntxiv hauv cov zis hluav taws xob ntawm lub zog hloov hluav taws xob. Tsis tas li ntawd, muaj kev txwv tam sim no rau optocouplers (optocouplers) thiab lwm yam.
Hauv kev hloov cov khoom siv hluav taws xob, kev siv cov resistors nyob rau hauv series yog ib txwm, tsis yog ua kom lub zog noj los yog tus nqi ntawm cov resistors, tab sis los txhim kho lub peev xwm ntawm cov resistors tiv taus siab tshaj voltage. Feem ntau, cov resistors tsis tau ceev faj txog lawv cov voltage. Qhov tseeb, cov resistors nrog lub zog sib txawv thiab qhov tseem ceeb tsis kam muaj qhov ua haujlwm siab tshaj plaws raws li qhov taw qhia. Thaum nyob rau hauv lub siab tshaj plaws kev khiav hauj lwm voltage, vim lub siab tsis kam, nws lub hwj chim noj tsis pub tshaj tus nqi, tab sis kuj yuav puas. Yog vim li cas yog tias ntau yam nyias zaj duab xis resistors tswj lawv qhov tseem ceeb tiv thaiv raws li lub thickness ntawm nyias zaj duab xis. Rau siab tiv thaiv resistors, tom qab nyias zaj duab xis yog sintered, qhov ntev ntawm zaj duab xis yog ncua los ntawm grooving. Qhov siab dua tus nqi kuj, qhov siab dua qhov grooving ceev. Thaum siv nyob rau hauv high-voltage circuits, lub txim paug tshwm sim ntawm cov grooves, ua rau muaj kev puas tsuaj. Yog li ntawd, hauv cov khoom siv hluav taws xob hloov hluav taws xob, qee zaum ob peb lub resistors txhob txwm txuas nrog hauv koob los tiv thaiv qhov tshwm sim no tshwm sim. Piv txwv li, qhov pib tsis txaus ntseeg nyob rau hauv cov khoom siv rau tus kheej zoo siab hloov cov khoom siv hluav taws xob, qhov kev tiv thaiv ntawm kev hloov cov raj txuas nrog DCR nqus Circuit Court nyob rau hauv ntau yam khoom siv hluav taws xob hloov, thiab daim ntawv thov kuj nyob rau hauv high-voltage ib feem ntawm hlau halide teeb ballasts.
PTC thiab NTC yog cov khoom siv thermal ua haujlwm. PTC muaj qhov zoo kub coefficient loj, thaum NTC muaj qhov kub tsis zoo coefficient loj. Nws cov yam ntxwv kuj thiab kub, volt ampere yam ntxwv, thiab tam sim no thiab lub sij hawm kev sib raug zoo yog kiag li txawv los ntawm zoo tib yam resistors. Hauv cov khoom siv hluav taws xob hloov pauv, PTC resistors nrog qhov ntsuas kub zoo yog feem ntau siv hauv circuits uas yuav tsum tau siv hluav taws xob tam sim. Piv txwv li, PTC siv nyob rau hauv lub hwj chim mov Circuit Court ntawm lub excitation tsav integrated circuit muab ib tug pib tam sim no rau lub tsav integrated circuit nrog nws cov nqi kuj tsis tshua muaj nqi thaum pib. Tom qab cov kev sib txuas ua ke tsim cov khoom siv hluav taws xob, nws yog tom qab ntawd muab cov khoom siv hluav taws xob rectified los ntawm kev hloov hluav taws xob. Thaum lub sijhawm txheej txheem no, PTC cia li kaw qhov pib Circuit Court vim qhov nce ntawm qhov kub thiab txias los ntawm qhov pib tam sim no. Lub NTC tsis zoo kub yam ntxwv resistor yog dav siv raws li qhov tam sim no limiting resistor rau instantaneous inputs nyob rau hauv switching fais fab mov, hloov cov tsoos cement resistors. Nws tsis tsuas yog txuag lub zog tab sis kuj txo qhov kub nce hauv lub tshuab. Nyob rau lub sijhawm thaum lub tshuab hluav taws xob hloov pauv tau qhib, qhov pib them tam sim no ntawm lub lim dej capacitor yog qhov siab heev, thiab NTC sai sai. Tom qab lub ncov them ntawm lub capacitor, NTC kuj txo qis vim qhov kub thiab txias. Nyob rau hauv ib txwm ua haujlwm tam sim no, nws tswj hwm nws cov nqi qis, txo qis zog ntawm tag nrho lub tshuab.
Tsis tas li ntawd, zinc oxide varistors kuj tau siv nyob rau hauv kev hloov hom fais fab mov circuits. Zinc oxide varistors muaj qhov nrawm nrawm nrawm nrawm nrawm nrawm. Cov yam ntxwv loj tshaj plaws ntawm varistors yog tias thaum qhov hluav taws xob siv rau lawv qis dua nws qhov pib, qhov tam sim no ntws los ntawm lawv yog qhov me me, sib npaug rau lub valve kaw. Thaum qhov voltage tshaj qhov pib, qhov tam sim no ntws los ntawm nws nce sharply, sib npaug rau lub valve qhib. Los ntawm kev siv cov haujlwm no, qhov txawv txav overvoltage uas feem ntau tshwm sim hauv Circuit Court tuaj yeem raug tshem tawm, tiv thaiv Circuit Court los ntawm overvoltage puas. Varistors feem ntau txuas nrog cov tswv yim tseem ceeb ntawm kev hloov cov khoom siv hluav taws xob thiab tuaj yeem nqus cov hluav taws xob hluav taws xob uas cuam tshuam los ntawm daim phiaj hluav taws xob. Thaum lub mains voltage siab dhau lawm, lawv ua lub luag haujlwm tiv thaiv.
