Yuav ua li cas koj xaiv lub lim capacitor kom raug thaum tsim ib lub zog hloov hluav taws xob?
Lub lim capacitor plays lub luag haujlwm tseem ceeb hauv kev hloov hluav taws xob. Yuav ua li cas xaiv lub lim capacitor kom raug, tshwj xeeb tshaj yog kev xaiv ntawm cov zis lim capacitor yog ib qho teeb meem uas txhua tus engineer thiab cov kws tshaj lij muaj kev txhawj xeeb heev. Peb tuaj yeem pom ntau yam capacitors ntawm lub zog lim hluav taws xob, 100uF, 10uF, 100nF, 10nF nrog cov nqi sib txawv, yog li cov kev ntsuas no tau txiav txim siab li cas? Tsis txhob qhia kuv tias kuv tau theej lwm tus tus schematic daim duab, huh, huh.
Rau cov electrolytic capacitors siv nyob rau hauv 50Hz fais fab zaus circuits, lub pulsating voltage zaus tsuas yog 100Hz, thiab lub sij hawm them thiab tawm yog nyob rau hauv qhov kev txiav txim ntawm milliseconds. Yuav kom tau txais ib qho me me pulsation coefficient, qhov yuav tsum tau muaj peev xwm yog siab li ntau pua txhiab μF. Yog li ntawd, lub hom phiaj ntawm qhov zoo tib yam tsawg zaus txhuas electrolytic capacitors yog ua kom lub capacitance. Lub ntsiab parameter ntawm pros thiab cons. Txawm li cas los xij, cov zis lim electrolytic capacitor nyob rau hauv cov khoom siv hluav taws xob hloov hluav taws xob muaj qhov hluav taws xob sawtooth yoj voltage ntau npaum li kaum tawm kHz, lossis txawm kaum ntawm MHz. Lub sij hawm no, lub capacitance tsis yog lub ntsiab qhia. Tus qauv ntsuas qhov zoo ntawm high-frequency aluminium electrolytic capacitors yog "impedance-" zaus" cov yam ntxwv, nws yuav tsum muaj qhov sib npaug qis dua nyob rau hauv kev khiav hauj lwm zaus ntawm kev hloov hluav taws xob, thiab tib lub sijhawm muaj kev lim dej zoo. cuam tshuam rau lub high-frequency spikes generated thaum lub semiconductor ntaus ntawv ua hauj lwm.
Ordinary low-frequency electrolytic capacitors pib qhia inductivity nyob ib ncig ntawm 10kHz, uas tsis tuaj yeem ua tau raws li qhov yuav tsum tau muaj ntawm kev hloov khoom siv hluav taws xob. Lub high-frequency txhuas electrolytic capacitor nplooj siab rau lub switching fais fab mov muaj plaub terminals. Ob qhov kawg ntawm daim ntawv zoo txhuas yog feem ntau kos tawm raws li qhov zoo electrode ntawm lub capacitor, thiab ob qhov kawg ntawm daim ntawv tsis zoo txhuas kuj raug cuam tshuam raws li qhov tsis zoo electrode. Tam sim no ntws los ntawm ib lub davhlau ya nyob twg zoo ntawm plaub lub davhlau ya nyob twg capacitor, dhau los ntawm sab hauv ntawm lub capacitor, thiab tom qab ntawd ntws los ntawm lwm qhov zoo tshaj plaws mus rau lub load; Tam sim no rov qab los ntawm lub load kuj ntws los ntawm ib qho tsis zoo davhlau ya nyob twg ntawm lub capacitor, thiab ces ntws los ntawm lwm yam tsis zoo davhlau ya nyob twg mus rau qhov tsis zoo davhlau ya nyob twg ntawm lub hwj chim mov.
Txij li thaum plaub lub davhlau ya nyob twg capacitor muaj cov yam ntxwv siab zaus, nws muab cov txiaj ntsig zoo heev rau kev txo cov pulsating tivthaiv ntawm qhov hluav taws xob thiab txo qis lub suab nrov ntawm kev hloov pauv. High-frequency aluminium electrolytic capacitors kuj muaj ntau daim ntawv, uas yog, cov ntawv txhuas txhuas tau muab faib ua ob peb ntu luv, thiab ntau cov hlau lead yog txuas nrog rau tib lub sijhawm kom txo cov impedance tivthaiv hauv capacitive reactance. Thiab kev siv cov ntaub ntawv uas tsis tshua muaj zog raws li cov hlau lead-out terminals txhim kho lub peev xwm ntawm lub capacitor kom tiv taus cov dej loj.
Rau cov hluav taws xob digital kom ua haujlwm ruaj khov thiab ntseeg tau, cov khoom siv hluav taws xob yuav tsum "huv", thiab lub zog ntxiv yuav tsum tau raws sijhawm, uas yog, lim thiab decoupling yuav tsum zoo. Dab tsi yog lim decoupling, tsuas yog muab tso rau, nws yog khaws cia lub zog thaum lub nti tsis xav tau tam sim no, thiab kuv tuaj yeem ntxiv zog rau lub sijhawm thaum koj xav tau tam sim no. Tsis txhob qhia kuv tias lub luag haujlwm no tsis yog rau DCDC thiab LDO? Yog lawm, ntawm qhov tsawg zaus lawv tuaj yeem tswj tau nws, tab sis kev kub ceev digital systems txawv.
