Kev soj ntsuam ntawm Electromagnetic Compatibility Design Methods rau Hloov Cov Khoom Siv Hluav Taws Xob
Cov khoom siv hluav taws xob hloov pauv tau siv dav hauv kev sib txuas lus, kev tswj hwm, khoos phis tawj thiab lwm yam haujlwm vim lawv qhov zoo xws li qhov me me thiab lub zog loj. Txawm li cas los xij, vim muaj kev cuam tshuam ntawm electromagnetic cuam tshuam, nws daim ntawv thov ntxiv yog txwv rau qee qhov. Kab lus no yuav txheeb xyuas ntau yam kev cuam tshuam ntawm electromagnetic cuam tshuam hauv kev hloov cov khoom siv hluav taws xob, thiab raws li qhov no, nthuav tawm cov qauv tsim hluav taws xob sib xws rau kev hloov cov khoom siv hluav taws xob.
Kev soj ntsuam ntawm Electromagnetic cuam tshuam hauv Hloov Cov Khoom Siv Hluav Taws Xob
Cov qauv ntawm cov khoom siv hluav taws xob hloov pauv tau pom nyob rau hauv daim duab 1. Ua ntej, lub zog zaus AC raug kho rau DC, tom qab ntawd hloov mus rau hauv high-frequency, thiab thaum kawg tso tawm los ntawm rectification thiab filtering Circuit Court kom tau txais qhov ruaj khov DC voltage. Kev tsim hluav taws xob tsis tsim nyog thiab kev teeb tsa, kev ua haujlwm tsis zoo, tsis zoo hauv av, thiab lwm yam tuaj yeem tsim kev cuam tshuam hauv electromagnetic. Nyob rau tib lub sijhawm, cov dej xau inductance ntawm transformer thiab lub ncov tshwm sim los ntawm qhov rov qab rov qab tam sim no ntawm cov zis diode kuj tseem muaj peev xwm cuam tshuam.
Internal cuam tshuam qhov chaw
● Hloov Circuit Court
Lub tshuab hluav taws xob hloov feem ntau muaj cov raj hloov pauv thiab cov tshuab hluav taws xob ntau zaus. Muaj ib qho kev faib tawm ntawm lub raj hloov thiab nws lub dab dej kub, lub plhaub, thiab cov coj hauv lub hwj chim. Lub du/dt generated los ntawm nws muaj ib tug loj amplitude ntawm pulses, ib tug dav zaus band, thiab nplua nuj harmonics. Hloov lub raj load yog thawj kauj ntawm lub siab zaus transformer thiab yog inductive load. Thaum lub qhov hluav taws xob ua hluav taws xob tau raug muab tua, qhov xau inductance ntawm high-frequency transformer generates ib tug rov qab electromotive quab yuam E=- Ldi / dt, uas yog proportional rau lub tam sim no hloov tus nqi ntawm lub collector thiab cov leakage inductance. Nws yog superimposed nyob rau hauv lub xa tawm voltage los tsim ib tug tig tawm voltage ncov, yog li tsim conductive cuam tshuam.
● Rectifier diodes rau rectifier circuits
Thaum cov zis rectifier diode raug txiav tawm, muaj qhov rov qab tam sim no, thiab lub sij hawm nws yuav siv sij hawm rov qab mus rau xoom yog muaj feem xyuam rau yam xws li junction capacitance. Nws yuav tsim cov kev hloov pauv tseem ceeb tam sim no di / dt nyob rau hauv kev cuam tshuam ntawm transformer to inductance thiab lwm yam kev faib tawm, uas ua rau muaj kev cuam tshuam loj heev, nrog rau ntau zaus txog li kaum ntawm megahertz.
● Kev tsis ncaj ncees
Vim yog ua haujlwm ntawm ntau zaus, cov yam ntxwv ntawm cov khoom siv tsawg zaus hauv kev hloov cov khoom siv hluav taws xob tuaj yeem hloov pauv, ua rau lub suab nrov. Nyob rau hauv high zaus, cov kev tsis sib haum xeeb muaj feem cuam tshuam rau cov yam ntxwv ntawm kev sib txuas ntawm cov channel, thiab cov khoom siv hluav taws xob faib ua cov channel rau electromagnetic cuam tshuam.
2 Cov kev cuam tshuam sab nraud
Kev cuam tshuam sab nraud tuaj yeem muab faib ua hluav taws xob cuam tshuam thiab kev cuam tshuam xob laim, thaum lub zog cuam tshuam muaj nyob rau hauv ob qho tib si "hom" thiab "hom txawv" hom. Nyob rau tib lub sijhawm, vim qhov kev sib txuas ncaj qha ntawm AC lub zog hluav taws xob mus rau tus choj rectifier thiab lim Circuit Court, tsuas yog lub sijhawm siab tshaj plaws ntawm cov khoom siv hluav taws xob muaj cov khoom siv tam sim no nyob rau hauv ib nrab ntawm lub voj voog, uas ua rau muaj qhov hluav taws xob qis heev (kwv yees li { {0}}.6) ntawm lub hwj chim mov. Ntxiv mus, qhov tam sim no muaj ntau cov khoom sib haum xeeb, uas tuaj yeem ua rau muaj kev sib haum xeeb "kev ua qias tuaj" rau hauv daim phiaj hluav taws xob.
