Yuav ua li cas tiv thaiv kev tsim ntawm ripple hauv kev hloov cov khoom siv hluav taws xob
Switching fais fab mov ripple tiam
Peb lub hom phiaj tseem ceeb yog kom txo tau cov zis ripple mus rau theem siab, kom ua tiav lub hom phiaj no, qhov tseem ceeb tshaj plaws kev daws teeb meem yog sim kom tsis txhob muaj lub cim ntawm ripple, ua ntej ntawm tag nrho cov, peb yuav tsum paub meej txog hom hloov hluav taws xob ripple thiab cov vim li cas rau nws.
Tom qab kev hloov ntawm SWITCH, tam sim no hauv inductor L kuj hloov pauv nce thiab nqis hauv RMS tus nqi ntawm cov zis tam sim no. Yog li cov zis kuj tseem yuav raug dej nyab nrog lub ripple nrog tib zaus raws li SWITCH, feem ntau hu ua ripple yog qhov no. Nws muaj kev sib raug zoo nrog lub peev xwm ntawm cov zis capacitor thiab ESR. Qhov zaus ntawm qhov ripple no zoo ib yam li lub zog hloov hluav taws xob, kaum rau ntau pua KHz.
Tsis tas li ntawd, SWITCH feem ntau xaiv bipolar transistors lossis MOSFETs, ib qho, nyob rau hauv thiab tawm, yuav muaj lub sijhawm nce thiab lub caij nplooj zeeg. Lub sijhawm no hauv Circuit Court yuav raug dej nyab nrog SWITCH nce thiab poob lub sijhawm ntawm tib zaus lossis ntau qhov txawv ntawm lub suab nrov, feem ntau kaum ntawm MHz. tib lub diode D nyob rau hauv lub sij hawm rov qab, qhov sib npaug Circuit Court rau qhov kev tiv thaiv capacitance thiab inductance ntawm cov series kev twb kev txuas, yuav ua rau resonance, ua rau lub suab nrov zaus ntawm ntau kaum ntawm MHz. ob hom suab nrov no feem ntau hu ua lub suab nrov nrov, amplitude feem ntau loj dua qhov ripple.
Yog hais tias lub AC / DC converter, ntxiv rau cov saum toj no ob ripple (suab nrov), muaj AC suab nrov, qhov zaus yog qhov zaus ntawm cov khoom siv hluav taws xob AC, txog li 50 txog 60Hz. Kuj tseem muaj lub suab nrov nrov, tshwm sim los ntawm qhov sib npaug ntawm cov khoom siv hluav taws xob tsim los ntawm cov khoom siv hluav taws xob ntawm ntau cov khoom siv hluav taws xob hloov hluav taws xob siv rooj plaub ua lub dab dej kub. Raws li kuv tab tom ua automotive electronics kev tshawb fawb thiab kev loj hlob, rau tom kawg ob lub suab hu tsawg dua, yog li tsis txhob xav txog lub sijhawm.
Switching zog mov ripple ntsuas
Cov kev cai yooj yim: kev siv oscilloscope AC coupling, 20MHz bandwidth txwv, unplug lub sojntsuam txoj kab hauv av
1, AC coupling yog tshem tawm cov superimposed DC voltage, kom tau qhov tseeb waveform.
2, Qhib 20MHz bandwidth txwv yog los tiv thaiv kev cuam tshuam ntawm lub suab nrov nrov, tiv thaiv kev ntsuas qhov tsis ncaj ncees lawm. Vim lub siab-frequency tivthaiv amplitude yog loj, qhov ntsuas yuav tsum tau muab tshem tawm.
3, rub tawm lub oscilloscope sojntsuam grounding clip, siv lub nplhaib grounding ntsuas, yog los txo kev cuam tshuam. Ntau qhov chaw tsis muaj lub nplhaib hauv av, yog tias qhov yuam kev cog lus ncaj qha siv qhov ntsuas qhov ntsuas av hauv av. Txawm li cas los xij, qhov tseem ceeb no yuav tsum tau coj mus rau hauv tus account thaum txiav txim siab seb nws puas tsim nyog.
Lwm lub ntsiab lus yog siv 50Ω davhlau ya nyob twg. Yokogawa oscilloscope cov ntaub ntawv ntawm thawj zaug hais tias 50Ω module yog tshem tawm DC tivthaiv, ntsuas AC tivthaiv. Tab sis ob peb oscilloscopes nrog rau qhov tshwj xeeb sojntsuam no, feem ntau yog ntsuas siv tus qauv 100KΩ txog 10MΩ sojntsuam, qhov cuam tshuam tsis meej rau lub sijhawm.
Saum toj no yog qhov ntsuas ntawm kev hloov ripple thaum lub ntsiab lus. Yog hais tias lub oscilloscope sojntsuam tsis nyob rau hauv kev sib cuag nrog cov zis taw tes, koj yuav tsum siv ib tug twisted khub, los yog 50Ω coaxial cable ntsuas.
Thaum ntsuas lub suab nrov nrov, siv tag nrho passband ntawm oscilloscope, feem ntau yog ob peb puas megabits mus rau qib GHz. Lwm tus yog tib yam li saum toj no. Tej zaum nws yuav yog cov tuam txhab sib txawv muaj cov kev sim sib txawv. Nws tag nrho ua rau kom meej meej txog koj cov txiaj ntsig kev xeem. Qhov tseem ceeb tshaj plaws yog kom lees paub los ntawm cov neeg siv khoom.
