Qhov cuam tshuam ntawm kev hloov hluav taws xob hloov ntawm lub resistor
Kev xaiv ntawm cov resistors nyob rau hauv switching 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 lub Circuit Court, tab sis kuj muaj peev xwm tiv taus lub siab tshaj plaws tam sim no. Ib qho piv txwv yog lub zog piv txwv ntawm qhov hloov MOS transistor, uas txuas nrog hauv cov kab ntawm qhov hloov MOS transistor thiab hauv av. Feem ntau, tus nqi tiv thaiv 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. Txawm li cas los xij, xav txog lub peev xwm los tiv thaiv qhov siab tshaj plaws tam sim no ntawm kev hloov MOS transistor, qhov amplitude tam sim no loj dua li tus nqi ib txwm nyob rau lub sijhawm pib. Nyob rau tib lub sijhawm, kev ntseeg siab ntawm cov resistor kuj tseem ceeb heev. Yog hais tias nws yog qhib Circuit Court vim tam sim no cuam tshuam thaum lub sij hawm ua hauj lwm, ib tug mem tes siab voltage sib npaug zos rau cov khoom voltage ntxiv rau lub back ncov voltage yuav raug generated ntawm ob lub ntsiab lus ntawm lub Circuit Court board uas tus resistor nyob, thiab nws yuav tsum tau tawg. . Nyob rau tib lub sijhawm, nws tseem yuav rhuav tshem cov kev sib koom ua ke ntawm IC ntawm lub overcurrent tiv thaiv Circuit Court. Vim li no, feem ntau 2W hlau zaj duab xis resistor raug xaiv rau qhov resistor no. Qee cov khoom siv hluav taws xob hloov pauv siv 2-4 1W resistors nyob rau hauv parallel, tsis yog kom muaj zog dissipation, 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 qhov qhib Circuit Court. Ib yam li ntawd, qhov piv txwv tsis kam ntawm qhov tso zis hluav taws xob ntawm lub zog hloov hluav taws xob kuj tseem ceeb heev. Thaum qhov kev tawm tsam qhib, qhov ntsuas qhov ntsuas yog xoom volts, thiab PWM nti tso zis mem tes mus txog nws tus nqi siab tshaj plaws, ua rau muaj qhov nce ntxiv ntawm qhov hluav taws xob 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 ntau, tsis yog ua kom lub zog noj los yog cov nqi ntawm cov resistors, tab sis los txhim kho qhov kev tiv thaiv lub peev xwm los tiv thaiv qhov siab tshaj voltage. Feem ntau, cov resistors tsis them nyiaj ntau rau lawv cov hluav taws xob tiv taus. 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 ntawm lub siab tshaj plaws kev khiav hauj lwm voltage, vim lub siab tsis kam, lub hwj chim noj tsis tshaj tus nqi ntsuas, tab sis lub kuj kuj tuaj yeem tawg. Yog vim li cas yog tias ntau yam nyias zaj duab xis resistors tswj lawv cov kev tiv thaiv qhov tseem ceeb raws li lub thickness ntawm zaj duab xis. Rau cov resistors siab, tom qab zaj duab xis yog sintered, qhov ntev ntawm zaj duab xis yog txuas ntxiv 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 kev hloov cov khoom siv hluav taws xob, qee zaum ob peb lub resistors txhob txwm txuas nrog hauv cov koob los tiv thaiv qhov tshwm sim ntawm qhov tshwm sim. Piv txwv li, qhov pib tsis ncaj ncees 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 tsis kam thiab kub, cov yam ntxwv ntawm volt ampere, thiab kev sib raug zoo tam sim no thiab lub sijhawm sib txawv ntawm cov resistors zoo tib yam. Hauv kev hloov cov khoom siv hluav taws xob, PTC resistors nrog qhov kub thiab txias coefficient feem ntau yog siv rau hauv circuits uas yuav tsum tau siv hluav taws xob tam sim. Piv txwv li, PTC siv nyob rau hauv nws excitation tsav integrated Circuit Court fais fab mov Circuit Court muab pib tam sim no mus rau lub tsav integrated circuit nrog nws cov nqi kuj tsis tshua muaj nqi thaum lub sij hawm 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 rov qab los ntawm kev hloov hluav taws xob. Thaum lub sij hawm tus 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. NTC tsis zoo kub yam ntxwv resistors yog dav siv raws li instantaneous input tam sim no limiting resistors nyob rau hauv switching fais fab mov, hloov cov tsoos cement resistors. Lawv tsis tsuas yog txuag lub zog tab sis kuj txo qhov kub thiab txias ntawm sab hauv. Thaum lub sijhawm tig ntawm lub zog hloov pauv, qhov pib them tam sim no ntawm lub lim capacitor yog siab heev, thiab NTC sai sai. Tom qab lub ncov them ntawm lub capacitor, NTC kuj txo qis vim qhov kub nce. Raws li 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 los hloov cov khoom siv hluav taws xob. Zinc oxide siab
Lub varistor muaj qhov ceev ceev ncov voltage nqus dej ua haujlwm. Cov yam ntxwv loj tshaj plaws ntawm varistor yog tias thaum qhov hluav taws xob siv rau nws qis dua nws qhov pib, qhov tam sim no ntws los ntawm nws yog qhov me me, sib npaug rau lub valve kaw. Thaum qhov hluav taws xob tshaj qhov pib, qhov tam sim no ntws los ntawm nws surges, sib npaug rau lub valve qhib. Los ntawm kev siv qhov kev ua haujlwm no, qhov txawv txav overvoltage uas feem ntau tshwm sim hauv Circuit Court tuaj yeem raug tshem tawm thiab Circuit Court tuaj yeem tiv thaiv los ntawm overvoltage puas. Varistors feem ntau txuas nrog lub ntsiab lus ntawm kev hloov cov khoom siv hluav taws xob thiab tuaj yeem nqus tau hluav taws xob vim muaj hluav taws xob siab los ntawm daim phiaj hluav taws xob, muab kev tiv thaiv thaum lub zog hluav taws xob siab dhau.
