Switching fais fab mov pib tsis kam
Kev xaiv ntawm cov resistors nyob rau hauv lub switching fais fab mov Circuit Court 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 txiav txim siab lub peev xwm los tiv thaiv lub siab tshaj plaws tam sim no. Ib qho piv txwv zoo yog lub zog sampling resistor ntawm switching MOS raj. Lub sampling resistor yog txuas nyob rau hauv series ntawm switching MOS raj thiab hauv av. Feem ntau, tus nqi kuj yog me me, thiab qhov siab tshaj qhov poob qis tsis tshaj 2V. Nws zoo nkaus li tias nws tsis tas yuav tsum siv lub zog hluav taws xob siab nyob rau hauv cov nqe lus ntawm kev siv hluav taws xob. , tab sis xav txog lub peev xwm los tiv thaiv qhov siab tshaj plaws tam sim no ntawm MOS lub raj hloov, qhov tam sim no amplitude yog ntau dua li tus nqi ib txwm nyob rau lub sijhawm ntawm lub hwj chim. Nyob rau tib lub sijhawm, kev ntseeg siab ntawm cov resistor kuj tseem ceeb heev. Yog tias nws tau qhib los ntawm qhov cuam tshuam tam sim no thaum ua haujlwm, lub tshuab hluav taws xob siab sib npaug sib npaug ntawm lub zog hluav taws xob ntxiv rau qhov rov qab siab tshaj qhov hluav taws xob yuav raug tsim los ntawm ob lub ntsiab lus ntawm cov ntawv luam tawm Circuit Board qhov twg cov resistor nyob. Nws tau tawg, thiab tib lub sijhawm, kev sib koom ua ke ntawm IC ntawm lub overcurrent tiv thaiv Circuit Court yog tawg. Vim li no, cov resistors feem ntau yog 2W hlau zaj duab xis resistors. Hauv qee cov khoom siv hluav taws xob hloov pauv, 2-4 1W resistors txuas nrog rau tib lub sijhawm, tsis yog kom muaj hluav taws xob ntau dua, tab sis muab kev ntseeg tau. Txawm hais tias ib qho resistor puas qee zaus, muaj ob peb lwm yam resistors kom tsis txhob qhib circuits. Nyob rau hauv tib txoj kev, tus qauv resistor ntawm cov zis voltage ntawm lub switching fais fab mov kuj tseem ceeb heev. Thaum lub resistor qhib, qhov piv txwv voltage yog xoom volts, cov zis pulse ntawm PWM nti nce mus rau qhov siab tshaj plaws tus nqi, thiab cov zis voltage ntawm lub switching fais fab mov nce sharply. Tsis tas li ntawd, muaj kev txwv tam sim no ntawm optocouplers (optocouplers) thiab lwm yam.
Hauv kev hloov cov khoom siv fais fab, kev siv cov resistors hauv series yog ntau heev. Lub hom phiaj tsis yog ua kom lub zog noj lossis ua haujlwm ntawm cov resistors, tab sis txhawm rau txhim kho lub peev xwm ntawm cov resistors kom tiv taus qhov siab tshaj. 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 kuj muaj qhov ntsuas ntawm qhov ua haujlwm siab tshaj plaws. Thaum nws yog nyob rau ntawm qhov siab tshaj plaws kev khiav hauj lwm voltage, lub hwj chim dissipation tsis tshaj tus nqi nyob rau hauv lub tsis tshua muaj zog kuj, tab sis kuj kuj yuav tawg. Yog vim li cas yog hais tias tus nqi kuj ntawm ntau yam nyias zaj duab xis resistors yog tswj los ntawm lub thickness ntawm zaj duab xis. Rau siab tiv thaiv tus nqi resistors, tom qab cov zaj duab xis yog sintered, qhov ntev ntawm zaj duab xis yog ncua los ntawm grooves. Qhov ntau dua tus nqi kuj, qhov ntau dua qhov zawj ntom ntom. , Thaum siv nyob rau hauv high-voltage circuits, sparking paug tshwm sim ntawm cov grooves thiab cov kuj yog puas. Yog li ntawd, hauv kev hloov cov khoom siv hluav taws xob, qee zaum ob peb lub resistors txhob txwm sib txuas hauv cov koob los tiv thaiv qhov tshwm sim ntawm qhov tshwm sim. Piv txwv li, qhov pib-up bias resistor nyob rau hauv ib qho kev hloov ntawm tus kheej zoo siab hloov hluav taws xob, qhov kev tiv thaiv ntawm lub raj xa hluav taws xob txuas nrog DCR nqus Circuit Court nyob rau hauv ntau yam khoom siv hluav taws xob hloov hluav taws xob, thiab cov khoom siv hluav taws xob siab nyob rau hauv cov hlau halide teeb. ballast, thiab lwm yam.
PTC thiab NTC yog cov khoom ua haujlwm kub-rhiab heev. PTC muaj qhov kub zoo coefficient loj, thiab NTC, ntawm qhov tsis sib xws, muaj qhov kub tsis zoo coefficient loj. Nws tus nqi kuj thiab kub yam ntxwv, volt-ampere yam ntxwv, thiab tam sim no-lub sij hawm kev sib raug zoo yog kiag li txawv los ntawm zoo tib yam resistors. Hauv kev hloov cov khoom siv hluav taws xob, PTC resistors nrog qhov zoo kub coefficients feem ntau yog siv hauv circuits uas yuav tsum tau siv hluav taws xob tam sim. Piv txwv li, nws txhawb PTC siv nyob rau hauv lub hwj chim mov Circuit Court ntawm kev tsav tsheb integrated circuit. Thaum nws qhib, nws tus nqi qis kuj muab qhov pib tam sim no rau kev tsav tsheb sib xyaw ua ke. Tom qab cov kev sib txuas ua ke tsim cov khoom siv hluav taws xob, nws yog powered los ntawm rectified voltage ntawm switching circuit. Thaum lub sijhawm txheej txheem no, PTC cia li kaw qhov pib hluav taws xob vim qhov kub thiab txias thiab qhov kev tiv thaiv tus nqi nce los ntawm qhov pib tam sim no. NTC tsis zoo kub yam ntxwv resistors yog dav siv nyob rau hauv instantaneous input tam sim no limiting resistors ntawm switching fais fab mov los hloov cov tsoos cement resistors, uas tsis tsuas yog txuag lub zog, tab sis kuj txo qhov kub siab nyob rau hauv lub tshuab. Thaum lub tshuab hluav taws xob hloov pauv tau qhib, qhov pib them tam sim no ntawm lub lim capacitor yog siab heev, thiab NTC heats sai heev. Tom qab lub capacitor them tus nqi siab tshaj dhau, qhov tsis kam ntawm NTC resistor txo vim qhov kub nce. Lub zog noj ntawm tag nrho lub tshuab yog txo qis heev.
Tsis tas li ntawd, zinc oxide varistors kuj tseem siv tau los hloov cov khoom siv hluav taws xob. Zinc oxide varistor muaj qhov nrawm nrawm nrawm nrawm nrawm nrawm. Qhov loj tshaj ntawm varistor yog tias thaum qhov hluav taws xob siv rau nws qis dua nws qhov pib tus nqi, qhov tam sim no ntws los ntawm nws yog qhov me me, uas yog sib npaug rau qhov hloov pauv tuag. Lub valve, thaum qhov voltage tshaj qhov pib, qhov tam sim no ntws los ntawm nws surges, uas yog sib npaug rau lub valve qhib. Siv qhov kev ua haujlwm no, nws tuaj yeem cuam tshuam qhov txawv txav overvoltage uas feem ntau tshwm sim hauv Circuit Court thiab tiv thaiv Circuit Court los ntawm kev puas tsuaj los ntawm overvoltage. Lub varistor feem ntau txuas nrog lub mains input davhlau ya nyob twg ntawm lub switching fais fab mov, uas muaj peev xwm nqus tau cov hluav taws xob high voltage induced los ntawm daim phiaj fais fab thiab ua lub luag hauj lwm tiv thaiv thaum lub mains voltage siab dhau lawm.
