Hloov hom fais fab mov - pWM tawm tswv yim tswj hom
Feem ntau hais lus, lub hom phiaj tseem ceeb hauv pem hauv ntej tuaj yeem ua kom yooj yim siv cov kauj ruam-down chopper qhia hauv daim duab 1, qhov twg Ug sawv cev rau PWM tso zis tsav teeb liab ntawm kev tswj Circuit Court. Raws li kev xaiv ntawm PWM cov lus tawm tswv yim sib txawv, cov input voltage Uin, tso zis voltage Uout, hloov ntaus ntawv tam sim no (coj los ntawm point b), thiab inductor tam sim no (coj los ntawm point c lossis d) hauv Circuit Court tuaj yeem siv los ua piv txwv. tswj cov cim. Thaum cov zis hluav taws xob Uout siv los ua lub teeb liab tswj kev ntsuas, nws feem ntau ua tiav los ntawm lub voj voog uas pom hauv daim duab 2 kom tau txais cov teeb liab voltage Ue, uas yog tom qab ua tiav lossis xa ncaj qha mus rau PWM maub los. Lub tshuab hluav taws xob ua haujlwm hluav taws xob (e / a) hauv daim duab 2 muaj peb txoj haujlwm: ① Amplify thiab muab cov lus tawm tswv yim ntawm qhov sib txawv ntawm qhov tso zis hluav taws xob thiab qhov muab hluav taws xob Uref kom ruaj khov qhov tseeb ntawm lub xeev khov kho. Lub DC amplification nce ntawm qhov kev ua haujlwm amplifier no yog qhov kev xav tsis kawg, tab sis qhov tseeb nws yog qhov qhib-voj amplification nce ntawm kev ua haujlwm amplifier Hloov lub DC voltage teeb liab nrog wideband hloov suab nrov txuas nrog rau qhov tso zis davhlau ya nyob twg ntawm qhov hloov lub ntsiab hauv Circuit Court. "huv" DC tawm tswv yim tswj cov teeb liab (Ue) nrog rau qee qhov amplitude, uas khaws cov DC tsawg zaus tivthaiv thiab txo qis AC cov khoom siv ntau zaus. Vim lub siab zaus thiab amplitude ntawm kev hloov suab nrov, yog hais tias lub attenuation ntawm high-frequency hloov suab nrov tsis txaus, cov lus qhia nyob rau hauv lub xeev yuav tsis ruaj khov; Yog hais tias lub high-frequency hloov suab nrov attenuation loj heev, dynamic teb yuav qeeb. Txawm hais tias contradictory, lub hauv paus ntsiab lus tsim rau voltage yuam kev ua hauj lwm amplifiers tseem yog "high low-frequency gain and low-frequency gain" Calibrate tag nrho kaw-loop system kom ruaj khov.
Cov yam ntxwv ntawm Switching Power Supply PWM
1) Txawv PWM tawm tswv yim tswj hom muaj lawv tus kheej zoo thiab qhov tsis zoo. Thaum tsim cov khoom siv hluav taws xob hloov pauv, qhov tsim nyog PWM tswj hom yuav tsum raug xaiv raws li qhov xwm txheej tshwj xeeb.
2) Kev xaiv ntawm ntau hom kev tswj hwm thiab PWM cov lus tawm tswv yim yuav tsum tau ua ke nrog kev txiav txim siab ntawm cov tswv yim tshwj xeeb thiab cov khoom siv hluav taws xob ntawm cov khoom siv hluav taws xob hloov hluav taws xob, lub ntsiab hluav taws xob topology thiab cov khoom siv xaiv, cov suab nrov nrov ntawm cov zis hluav taws xob, thiab lub voj voog ua haujlwm. variation ntau.
3) PWM tswj hom yog evolving thiab interconnected, thiab muaj peev xwm hloov mus rau hauv ib leeg nyob rau hauv tej yam kev mob.
