Qhov sib txawv ntawm kev hloov hom fais fab mov thiab linear tswj fais fab mov
Dab tsi yog Switch Mode Power Supply?
Lub npe Lus Askiv Hloov Hom Fais Fab, lossis SMPS luv luv, yog lub zog siv hluav taws xob (PSU) uas siv qee yam hloov khoom siv los xa hluav taws xob los ntawm qhov chaw mus rau qhov chaw thauj khoom. Feem ntau nws tuaj yeem yog AC lossis DC, tab sis qhov thauj khoom yog DC.
Daim ntawv thov feem ntau siv rau lub tshuab hluav taws xob hloov hluav taws xob yog lub zog hluav taws xob rau lub khoos phis tawj thiab tau dhau los ua hom qauv ntawm lub zog hluav taws xob rau cov khoom siv hluav taws xob vim nws qhov kev ua haujlwm siab, tus nqi qis, thiab lub zog loj.
Cov qauv qauv
Lub tshuab hluav taws xob hloov hluav taws xob yog lub tshuab hluav taws xob tswj hluav taws xob uas siv lub tshuab hluav taws xob hloov hluav taws xob siab los hloov lub zog thiab tswj cov khoom tso tawm kom zoo.
Ib qho kev hloov pauv hloov dua tshiab yog ib qho transistor (zoo li lub hwj chim MOSFET), ib yam li cov kab hluav taws xob, tab sis qhov txawv yog tias cov transistor hla hauv ib qho SMPS tsis nyob hauv qhov saturation lossis tag nrho ntawm tas li, nws yog tag nrho ntawm Hloov ntawm tag nrho tawm. xeev thiab ib tug heev zaus, li no lub npe hloov hom fais fab mov.
Txij li lub sijhawm nruab nrab ntawm lub sijhawm hloov pauv (piv txwv li lub transistor) ua haujlwm tsawg dua, lub zog ntawm lub zog uas tau nkim lossis tawg vim yog cua sov tsawg heev piv rau cov khoom siv hluav taws xob. Qhov no ua rau muaj kev ua haujlwm zoo ntawm SMPS vim tias qhov hluav taws xob poob hla dhau ntawm transistor (lossis hloov lub caij) tsawg heev.
lub ntsiab kom zoo dua
Feem ntau cov khoom siv hluav taws xob DC, xws li microprocessors, microcontrollers, LEDs, transistors, chips, motors, thiab lwm yam, yog siv los ntawm cov khoom siv hluav taws xob xws li roj teeb. Hmoov tsis zoo, qhov teeb meem tseem ceeb ntawm cov roj teeb yog thaum qhov hluav taws xob siab dhau lossis qis dhau. Li no, SMPS yuav muab cov zis DC ruaj khov.
SMPS yog cov khoom siv hluav taws xob ntau, thiab cov khoom sib txawv tuaj yeem xaiv tau raws li hom kev thov, xws li kev txhawb zog, phaw, tawm tswv yim thiab cov khoom siv hluav taws xob cais tawm.
Tsis tas li ntawd, tus qauv SMPS zoo, nws qhov kev ua tau zoo tuaj yeem siab li 90 feem pua lossis ntau dua. Nyob rau hauv sib piv, qhov efficiency ntawm ib tug linear tswj fais fab mov yog nyob ntawm qhov voltage poob ntawm lub pass transistor, tab sis nyob rau hauv txhua rooj plaub, nws lub hwj chim mov efficiency tsis siab npaum li hais tias ntawm ib tug hloov-hom fais fab mov.
Lub zog efficiency yog dab tsi? Piv txwv li, piv txwv li, muaj 3V lithium roj teeb uas yuav tsum tau nqis mus rau 1.8V load, siv 100mA ntawm tam sim no. Lub zog pov tseg thaum tshav kub hauv lub transistor yog 0.12W, yog li lub zog siv hluav taws xob yog 40 feem pua.
Dab tsi ntxiv, SMPS IC muaj ntau dua lossis tsawg dua tag nrho cov haujlwm ntawm kev tsim SMPS discrete, yog li nws tso cai rau cov kws ua haujlwm los sim nrog kev tsim cov haujlwm kev cai.
