Qhov zoo sib xws thiab qhov sib txawv ntawm qhov siab zaus hloov hluav taws xob thiab cov khoom siv hluav taws xob linear
Cov yam ntxwv ntawm cov khoom siv hluav taws xob zoo tib yam:
Feem ntau cov khoom siv hluav taws xob linear, cov khoom siv hluav taws xob linear yog hais txog lub zog hluav taws xob uas lub raj hluav taws xob ua haujlwm hauv lub xeev linear. Txawm li cas los xij, qhov no txawv ntawm cov khoom siv hluav taws xob ntau zaus. Lub raj hloov hluav taws xob (hauv qhov hloov hluav taws xob hloov pauv, lub raj hloov pauv feem ntau yog hu ua lub raj hloov) ua haujlwm hauv ob lub xeev: on-resistance me me; off-resistance yog loj heev.
Feature ntawm high zaus switching fais fab mov:
High zaus hloov fais fab mov feem ntau muaj (pulse width modulation) PWM tswj IC thiab MOSFET. Nrog rau kev txhim kho thiab kev tsim kho tshiab ntawm lub zog hluav taws xob thev naus laus zis, kev hloov pauv hluav taws xob feem ntau yog siv hauv yuav luag txhua yam khoom siv hluav taws xob nrog cov yam ntxwv ntawm qhov me me, lub teeb yuag thiab kev ua haujlwm siab, thiab nws qhov tseem ceeb yog qhov pom tseeb.
Lub siab zaus hloov hom fais fab mov yog ib yam tshiab ntawm lub hwj chim mov. Nws muaj qhov zoo ntawm kev ua haujlwm siab, lub teeb yuag, qhov hluav taws xob nce thiab poob, thiab lub zog tso zis siab. Txawm li cas los xij, txij li lub voj voog ua haujlwm hauv lub xeev hloov, lub suab nrov kuj loj. Cia peb tham luv luv li cas ib kauj ruam-down switching fais fab mov ua haujlwm.
Lub Circuit Court muaj xws li hloov K (transistor lossis field effect transistor nyob rau hauv qhov tseeb Circuit Court), freewheeling diode D, lub zog cia inductor L, lim capacitor C, thiab lwm yam. Thaum lub hloov mus kaw, lub hwj huam mov yuav muab tam sim no mus rau lub load los ntawm. hloov K thiab inductor L, thiab yuav khaws ib feem ntawm lub zog hluav taws xob hauv inductor L thiab capacitor C nrog cov tam sim no. Raws li tus kheej-inductance ntawm inductor L, qhov tam sim no yuav nce kuj maj mam tom qab qhov hloov pauv, piv txwv li, cov zis tsis tuaj yeem ncav cuag tus nqi hluav taws xob tam sim ntawd. Tom qab ib lub sijhawm, qhov hloov pauv yuav tua. Raws li tus kheej-inductance nyhuv ntawm inductor L (nws tuaj yeem ua kom pom tseeb tias qhov tam sim no hauv inductor muaj qhov cuam tshuam inertial), tam sim no hauv Circuit Court tseem zoo ib yam, piv txwv li nws txuas ntxiv ntws los ntawm sab laug mus rau sab xis, qhov no tam sim no ntws los ntawm lub load, los ntawm hauv av Cov kab rov qab, ntws mus rau lub anode ntawm freewheeling diode D, ntws los ntawm diode D, thiab rov qab mus rau sab laug kawg ntawm inductor L, ua ib lub voj. Cov zis hluav taws xob tuaj yeem tswj tau los ntawm kev tswj xyuas thaum lub kaw lus kaw thiab qhib (piv txwv li, PWM pulse width modulation). Txoj cai tau ua tiav thaum kuaj pom qhov tso zis hluav taws xob los tswj lub sijhawm rau thiab tawm kom cov zis voltage tas li.
Thib ob, lub siab zaus hloov hluav taws xob thiab cov khoom siv hluav taws xob ntau
Vim tias lawv muaj qhov ntsuas hluav taws xob thiab siv cov lus tawm tswv yim rau kev tswj hluav taws xob. Qhov txawv yog tias lub zog hloov pauv hloov pauv tau hloov pauv los ntawm kev hloov lub raj, thaum lub zog zoo tib yam feem ntau yog tuned los ntawm cov kab nce ntawm triode.
Nyob rau hauv sib piv, lub hwj chim noj ntawm switching fais fab mov yog me me, daim ntawv thov ntau yam ntawm AC voltage yog dav, thiab lub ripple coefficient ntawm DC tso zis yog zoo dua.
Lub hauv paus ntsiab lus ntawm kev ua haujlwm tseem ceeb ntawm ib nrab choj hloov hluav taws xob yog qhov hloov pauv ntawm tus choj sab sauv thiab tus choj qis (thaum lub zaus siab, cov keyboards yog VMOS) tau qhib ib qho los ntawm ib qho. Ua ntej, tam sim no ntws los ntawm tus choj sab sauv hloov raj, thiab kev ua haujlwm ntawm cov kauj inductive yog siv los sau cov hluav taws xob hluav taws xob. Nyob rau hauv lub kauj, lub raj hloov ntawm tus choj sab saud raug muab tua, thiab lub raj xa hluav taws xob ntawm tus choj qis yog qhib. Lub inductor coil thiab capacitor txuas ntxiv muab lub zog rau sab nraud. Tom qab ntawd tua tus choj qis dua thiab tig rau ntawm tus choj saum toj kom tso cai rau tam sim no nkag mus, thiab cov txheej txheem rov ua dua. Txij li thaum ob lub arc extinguishing chambers yuav tsum tau hloov mus rau thiab tawm ib qho tom qab, nws yog hu ua switching power supply.
Cov khoom siv hluav taws xob linear sib txawv. Txij li thaum tsis muaj kev hloov pauv, cov kav dej sab saud ib txwm ntws. Yog tias muaj ntau dhau, cov dej yuav ntws tawm. Qhov no feem ntau tshwm sim thaum qee cov kab hluav taws xob hluav taws xob hluav taws xob ua kom muaj cua sov ntau, thiab cov hluav taws xob tsis muaj zog yog tag nrho hloov mus rau hauv tshav kub. Los ntawm qhov kev pom no, kev hloov pauv kev ua haujlwm ntawm cov khoom siv hluav taws xob linear yog qhov tsawg, tab sis yog tias cov khoom siv hluav taws xob siab siab, lub neej ntawm cov khoom yuav raug txo qis, yog li cuam tshuam rau kev siv zaum kawg.
