Qee qhov kev paub me me txog kev hloov hluav taws xob
Hloov hom lossis hloov hom fais fab mov lossis SMPS yog lub zog siv hluav taws xob (PSU) uas siv qee yam hloov khoom siv hloov hluav taws xob los ntawm qhov chaw mus rau qhov chaw thauj khoom. Feem ntau qhov chaw yog AC lossis DC thiab cov khoom thauj yog DC. Ib daim ntawv thov feem ntau yog ib chav siv hluav taws xob rau lub computer. Hloov hom fais fab mov (SMPS) tau dhau los ua cov qauv siv hluav taws xob rau cov khoom siv hluav taws xob vim nws lub zog loj. Lub hwj chim muab hluav taws xob yog ib feem tseem ceeb ntawm lub voj voog vim nws muab lub zog rau lub voj voog kom ua haujlwm zoo. Cov khoom siv hluav taws xob xav tau qhov hluav taws xob tas li yam tsis muaj qhov hloov pauv. Lub hwj chim mov yuav siv lub hwj chim uas tsis muaj kev tswj hwm thiab hloov mus rau hauv kev tswj hwm lub zog ruaj khov. Muaj ob hom khoom siv hluav taws xob: cov khoom siv hluav taws xob linear tswj thiab hloov cov khoom siv hluav taws xob (SMPS).
Lub linear tswj fais fab mov yog lub hwj huam mov uas nws cov zis voltage tuaj yeem hloov kho los ntawm cov khoom tswj hwm. Ib qho piv txwv yooj yim ntawm cov khoom hloov pauv yog ib qho resistor. Tab sis feem ntau siv series hloov cov ntsiab lus yog BJTs los yog MOSFETs nyob rau hauv active los yog linear hom, nyob rau hauv series nrog lub load. Raws li kev hloov pauv ntawm cov tswv yim lossis kev thauj khoom, qhov tam sim no ntawm lub transistor yuav hloov kom muaj qhov tso tawm tas li ntawm cov khoom siv hluav taws xob hloov. Qhov sib txawv ntawm cov tswv yim thiab cov zis (load) voltage yog txo nyob rau hauv lub transistor, thiab qhov sib txawv ntawm input thiab output (load) lub zog yog dissipated los ntawm transistor li tshav kub. Lub zog AC nkag mus rau lub rectifier thiab lim kom hloov mus rau DC. Tab sis qhov DC qhov no tsis yog tswj hwm vim nws tuaj yeem sib txawv yooj yim nrog kev hloov pauv hauv cov tswv yim. Qhov no unregulated DC mov ua hauj lwm raws li cov tswv yim rau cov linear regulator.
