Switching Power Supply Control Loop Stability Verification
Zaus teb cov yam ntxwv ntawm lub voj voog hloov hluav taws xob, yog tias cov yam ntxwv ntawm cov khoom siv hluav taws xob muaj qhov nce sib npaug ntawm 1 (0dB) ntawm qee zaus thiab theem hloov ntawm 180 degree, ces lub zog tswj lub voj.
yuav muaj lub zog txaus rov qab mus rau lub kaw lus thiab tswj lub oscillation ntawm qhov zaus no vim muaj cov lus pom zoo hauv theem (qhov kev hloov pauv no ntxiv rau qhov chaw pib ntawm 180 degree theem hloov, rau tag nrho theem hloov ntawm 360 degree ).
Oscillation. Txhawm rau kom tsis txhob muaj kev puas tsuaj zoo sib xws hauv cov khoom siv hluav taws xob, cov lus teb cov nyiaj them poob haujlwm feem ntau yog siv rau hauv lub voj voog tswj Circuit Court kom txo tau qhov siab.
kom txo tau qhov nce ntawm high-frequency kawg kom lub switching fais fab mov nyob ruaj khov nyob rau hauv lub preset zaus ntau.
Lub teeb liab resistor (Inserted Resistor) rau hauv lub voj tswj lub voj voog ntawm cov khoom siv hluav taws xob, txhaj tshuaj tshwj xeeb amplitude thiab ntau zaus ntawm lub teeb liab cuam tshuam (OUT), thaum lub teeb liab cuam tshuam txog qee qhov amplitude, lub voj kaw lus yuav teb rau cov teeb liab cuam tshuam. , thiab tom qab ntawd siv lub ntsuas hluav taws xob ntau zaus ntawm cov khoom siv hluav taws xob lub voj voog tawm (CH2) thiab lub zog hluav taws xob voj voog cuam tshuam cov teeb liab txhaj tshuaj (CH1) piv rau tib lub sijhawm. ) nyob rau tib lub sijhawm rau kev ntsuas ntsuas qhov sib piv, tom qab ntawd koj tuaj yeem muab qhov zaus thiab nce thiab theem ntawm kev sib raug zoo ntawm qhov nkhaus - Bode Plot Graph (Bode Plot Graph).
Nyob rau hauv cov txheej txheem kev xeem tiag tiag yuav tsum tau them sai sai rau qhov txuas yog qhov chaw ntawm qhov kev txhaj tshuaj resistor, nrog rau qhov loj ntawm tus nqi tsis kam. Txhawm rau txo qhov kev ntsuas qhov yuam kev, qhov kev sim tiag tiag feem ntau xaiv 10 ~ 100Ω tsis kam; qhov loj ntawm cov teeb liab cuam tshuam feem ntau yuav tsum tau rau nws qhov amplitude tsis tuaj yeem tshaj 5% ntawm cov zis hluav taws xob, txwv tsis pub ntsuas cov txiaj ntsig tsis raug.
