Yuav ua li cas rau suppress ripple hauv kev hloov hluav taws xob siv
Ua raws li kev hloov pauv ntawm kev mus hloov, tam sim no hauv inductor L kuj hloov pauv thiab nqis hauv qhov txiaj ntsig zoo ntawm cov zis tam sim no. Yog li tseem yuav muaj ib qho kev hloov kho ntawm cov zis tau xaus nrog tib zaus raws li hloov pauv, uas yog feem ntau xa mus rau raws li ripple. Nws muaj feem xyuam rau lub peev xwm thiab ESR ntawm cov zis capacitor.
Yuav ua li cas txwv cov tiam ntawm ripple hauv hloov hom fais fab tuag? Peb lub hom phiaj yog txhawm rau txo cov zis ripple rau qib siab. Qhov kev daws teeb meem tseem ceeb rau kev ua tiav lub hom phiaj no yog:
Tiam ntawm ripple hauv hloov fais fab fais fab
Peb lub hom phiaj yog kom txo qis cov zis Ripple rau qib siab, thiab cov kev daws teeb meem tseem ceeb rau kev ua tiav lub hom phiaj no yog kom zam dhau lub cim ntawm ripple ntau li ntau tau. Firstly, peb yuav tsum tau hais meej cov hom thiab ua rau ripple hauv qhov hloov pauv fais fab mov.
Ua raws li kev hloov pauv ntawm kev mus hloov, tam sim no hauv inductor L kuj hloov pauv thiab nqis hauv qhov txiaj ntsig zoo ntawm cov zis tam sim no. Yog li tseem yuav muaj ib qho kev hloov kho ntawm cov zis tau xaus nrog tib zaus raws li hloov pauv, uas yog feem ntau xa mus rau raws li ripple. Nws muaj feem xyuam rau lub peev xwm thiab ESR ntawm cov zis capacitor. Qhov zaus ntawm no ripple no zoo ib yam li uas hloov fais fab muab fais fab, xws li los ntawm kaum mus rau ntau pua tus kHz.
Ib qho ntxiv, hloov feem ntau siv Bipolar tistors lossis Mosfets. Tsis hais leej twg uas siv, yuav muaj lub sijhawm nce thiab lub sijhawm poob thaum nws tig mus. Txij ntawm no, ib lub suab nrov nrog tib zaus zaus lossis cov khib nyiab ntawm tus hloov nce thiab lub caij nplooj zeeg yuav tshwm sim hauv Circuit Court, feem ntau nyob rau hauv kaum ntawm MHz ntau. Thaum lub sij hawm ntawm rov qab rov qab, qhov sib npaug sib txuas ntawm Diode D yog kev sib txuas, uas tuaj yeem ua rau resonance thiab tsim lub suab nrov ntau zaus ntawm ob peb kaum tawm MHz. Ob hom suab nrov no feem ntau hu ua siab siab- lub suab nrov, thiab lawv cov nrov yog feem ntau ntau dua li ripple.
Yog tias nws yog AC / DC converter, ntxiv rau ob hom ripple (suab) tau hais los saum toj no, muaj ntau zaus ntawm lub tswv yim AC lub zog hluav taws xob, ib ncig ntawm 50-60Hz. Kuj tseem muaj ib hom suab nrov hom suab nrov, uas yog tshwm sim los ntawm cov khoom siv hluav taws xob muaj zog ntawm ntau tus hloov fais fab khoom siv siv cov conditionures li dej sov. Raws li kuv tau koom nrog hauv kev tshawb nrhiav hauv Automotive Electronics Tshawb nrhiav thiab kev txhim kho, Kuv tsis tshua muaj ob hom suab nrov, yog li kuv tsis xav txog lawv thaum lub sijhawm.
