Dab tsi yog qhov txawv ntawm kev hloov hluav taws xob thiab hluav taws xob zoo tib yam?
Ordinary fais fab mov yog feem ntau linear fais fab mov. Linear fais fab mov yog hais txog cov khoom siv hluav taws xob uas cov kav dej tswj tau ua haujlwm hauv lub xeev linear. Hauv kev hloov fais fab mov, nws txawv. Lub raj xa hluav taws xob (hauv kev hloov hluav taws xob, peb feem ntau hu rau lub raj hloov hloov lub raj) ua haujlwm nyob rau hauv ob lub xeev: ntawm-tsawg kuj; Tawm-qhov tsis kam yog siab heev.
Hloov fais fab mov yog ib yam tshiab ntawm lub hwj chim mov. Nws muaj qhov zoo ntawm kev ua haujlwm siab, lub teeb yuag, nce qib thiab nqis qis, thiab lub zog tso zis siab. Txawm li cas los xij, vim hais tias lub voj voog ua haujlwm hauv lub xeev hloov, lub suab nrov kuj loj. Cia peb tham luv luv txog txoj hauv kev ua haujlwm ntawm puck switching fais fab mov los ntawm daim duab hauv qab no. Raws li pom nyob rau hauv daim duab, lub Circuit Court muaj ib tug hloov K (tiag tiag ib tug triode los yog ib tug field effect transistor), ib tug freewheeling diode D, lub zog cia inductor L, lub lim capacitor C, thiab lwm yam. Thaum lub kaw lus kaw, lub hwj chim. muab cov khoom siv hluav taws xob rau cov khoom thauj los ntawm kev hloov K thiab inductor L, thiab khaws ib feem ntawm lub zog hluav taws xob hauv inductor L thiab capacitor C. tig rau, uas yog, cov zis tsis tuaj yeem ncav cuag lub zog hluav taws xob tam sim ntawd. Tom qab qee lub sijhawm, qhov hloov pauv tau raug kaw, thiab tam sim no hauv Circuit Court yuav nyob twj ywm tsis hloov, uas yog, nws yuav txuas ntxiv ntws los ntawm sab laug mus rau sab xis, vim yog tus kheej inductance ntawm inductor L (nws tuaj yeem ua tau. xav tias tam sim no hauv inductor muaj inertia). Qhov tam sim no ntws los ntawm kev thauj khoom, rov qab los hauv av, ntws mus rau lub anode ntawm lub freewheeling diode D, dhau los ntawm diode D, thiab rov qab mus rau sab laug kawg ntawm inductor L, yog li tsim ib lub voj voog. Los ntawm kev tswj lub sijhawm kaw thiab qhib lub sijhawm hloov pauv (xws li PWM-pulse width modulation), cov zis hluav taws xob tuaj yeem tswj tau. Yog hais tias lub sij hawm on-off yog tswj los ntawm kev kuaj xyuas qhov tso zis voltage kom cov zis voltage tsis hloov, lub hom phiaj ntawm voltage stabilization twb paub lawm.
Cov khoom siv hluav taws xob ntau thiab hloov hluav taws xob muaj tib qhov hluav taws xob tswj lub raj, uas siv cov ntsiab lus tawm tswv yim los tswj qhov voltage. Qhov txawv yog tias kev hloov hluav taws xob hloov pauv siv lub raj xa hluav taws xob hloov kho, thiab cov khoom siv hluav taws xob zoo tib yam feem ntau siv cov kab hluav taws xob amplification cheeb tsam ntawm triode los kho.
Piv txwv li, kev hloov hluav taws xob muaj kev siv hluav taws xob tsawg, kev siv dav dav rau AC voltage thiab zoo ripple coefficient ntawm cov zis DC, tab sis nws qhov tsis zoo yog hloov cov mem tes cuam tshuam.
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 (VMOS thaum zaus siab) tig rau hauv lem. Ua ntej, tam sim no ntws los ntawm kev hloov lub raj ntawm tus choj sab saud, thiab kev ua haujlwm ntawm cov inductor kauj yog siv los mloog cov hluav taws xob hauv lub kauj. Thaum kawg, qhov hloov lub raj ntawm tus choj sab saud raug muab tua, thiab lub raj xa hluav taws xob ntawm tus choj qis yog qhib. Lub inductor kauj thiab lub capacitor txuas ntxiv muab lub zog rau sab nraud. Tom qab ntawd tua tus choj qis dua lub raj, thiab tom qab ntawd tig rau ntawm tus choj sab sauv kom cia cov tam sim no nyob rau hauv, thiab lwm yam. Vim tias ob lub raj hloov pauv yuav tsum tau qhib thiab kaw, nws yog hu ua switching power supply.
Cov khoom siv hluav taws xob linear txawv. Vim tias tsis muaj kev hloov mus cuam tshuam, cov kav dej xa dej tau tso dej tawm. Yog tias muaj ntau dhau, nws yuav ntws tawm. Nov yog qhov peb feem ntau pom. Kev tswj cov raj ntawm qee cov khoom siv hluav taws xob linear muaj tus nqi calorific loj, thiab tag nrho cov hluav taws xob tsis muaj zog tau hloov mus rau hauv lub zog hluav taws xob. Los ntawm qhov kev pom no, kev hloov pauv kev ua haujlwm ntawm cov khoom siv hluav taws xob linear tsawg heev, thiab thaum tshav kub kub, lub neej ntawm cov khoom yuav raug khi rau poob, uas yuav cuam tshuam rau qhov kawg siv cov nyhuv.
