Hloov fais fab mov ua rau electromagnetic compatibility
24V switching fais fab mov ua hauj lwm nyob rau hauv lub high voltage thiab high tam sim no switching xeev, qhov ua rau ntawm electromagnetic compatibility teeb meem yog heev complex. Electromagnetic compatibility ntawm lub tshuab, muaj feem ntau yog impedance coupling, kab coupling, hluav taws xob teb coupling, magnetic teb coupling electromagnetic yoj coupling ob peb yam. Electromagnetic compatibility tsim peb lub ntsiab lus: qhov chaw ntawm khawb, txoj kev nthuav tawm thiab cov ntsiab lus ntawm lub cev kos. Common impedance coupling feem ntau yog ib qho impedance uas muaj nyob nruab nrab ntawm qhov chaw ntawm kev cuam tshuam thiab lub cev cuam tshuam hluav taws xob, thiab los ntawm qhov impedance no, cov teeb liab cuam tshuam nkag mus rau hauv cov khoom cuam tshuam. Interline coupling feem ntau yog tsim los ntawm khawb qhov hluav taws xob thiab khawb tam sim no ntawm cov hlau lossis PCB kab, vim yog cov xaim sib txuas thiab kev sib txuas.
Hluav taws xob coupling feem ntau yog vim muaj qhov sib txawv ntawm qhov sib txawv, qhov cuam tshuam hluav taws xob tsim los ntawm kev sib txuas ntawm lub cev cuam tshuam. Sib nqus teb coupling feem ntau yog nyob ze ntawm lub zog hluav taws xob ntawm cov kab hluav taws xob siab tam sim no, qhov tsawg-frequency magnetic teb generated los ntawm cov coupling ntawm cov khoom yuav raug khawb. Electromagnetic teb coupling, feem ntau yog vim lub pulsating voltage los yog tam sim no generated los ntawm high-frequency electromagnetic vuag, los ntawm qhov chaw mus rau sab nrauv hluav taws xob, sib txuas coupling rau lub ntsiab lus ntawm lub coupling. Qhov tseeb, txhua hom kev sib txuas tsis tuaj yeem raug cais nruj me ntsis, tsuas yog tsom mus rau qhov sib txawv.
Nyob rau hauv 24V switching fais fab mov, lub ntsiab fais fab hloov raj nyob rau hauv ib tug high voltage, high-frequency switching hom, switching voltage thiab switching tam sim no nyob ze rau lub square nthwv dej, los ntawm cov spectral tsom xam, lub square yoj teeb liab muaj ib tug nplua nuj ntawm siab harmonics, lub siab harmonic spectrum mus txog ntau tshaj 1, 000 zaus ntawm lub square wave zaus. Nyob rau tib lub sijhawm, vim qhov xau inductance thiab kev faib tawm ntawm lub zog hloov hluav taws xob, nrog rau lub zog hloov pauv lub zog tseem ceeb ntawm kev ua haujlwm tsis zoo yog qhov zoo tagnrho, nyob rau hauv lub high-frequency switching on lossis off, nws feem ntau tsim high-frequency thiab siab. -voltage peak harmonic oscillations, thiab siab harmonics generated los ntawm no harmonic oscillations yog kis mus rau hauv lub internal circuits los ntawm cov tis capacitance ntawm lub switching tube thiab lub heatsink los yog radiated mus rau qhov chaw los ntawm lub heatsink thiab lub transformer.
Siv rau rectifier thiab tam sim no-renewal diodes, kuj yog ib qho tseem ceeb ua rau muaj kev khawb ntau zaus. Vim hais tias ntawm lub rectifier thiab tam sim no-renewal diodes ua hauj lwm nyob rau hauv lub high-frequency switching xeev, vim lub diode tus lead parasitic inductance, junction capacitance, thiab lub xub ntiag ntawm reverse rov qab tam sim no, thiaj li hais tias nws ua hauj lwm ntawm ib tug heev npaum li cas ntawm kev hloov ntawm voltage. thiab tam sim no, thiab tsim cov zaus oscillation. Vim hais tias ntawm lub rectifier thiab tam sim no-renewal diodes feem ntau nyob ze rau lub hwj chim tso zis kab, qhov tshwm sim high-frequency khawb * yooj yim kis tau los ntawm DC tso zis kab.
Txhawm rau txhim kho 24V hloov hluav taws xob hloov hluav taws xob, siv lub zog hluav taws xob ua kom muaj txiaj ntsig zoo. Nyob rau tib lub sijhawm, txhawm rau txhim kho kev ua tau zoo thiab kev ntseeg siab ntawm lub voj voog, txo qhov kev ntxhov siab ntawm cov khoom siv hluav taws xob, ntau cov khoom siv hluav taws xob hloov hluav taws xob. Ntawm lawv, xoom-voltage, xoom-tam sim no lossis xoom-tam sim no hloov tshuab siv dav *. Cov tshuab no zoo heev txo cov electromagnetic khawb uas tsim los ntawm kev hloov khoom siv. Txawm li cas los xij, qhov kev hloov pauv tsis zoo ntawm kev nqus tsis zoo, feem ntau ntawm kev siv L, C rau lub zog hloov pauv, kev siv diode unidirectional conductivity kom ua tiav unidirectional hloov dua siab tshiab ntawm lub zog, thiab yog li ntawd, lub resonant circuit diode tau dhau los ua qhov tseem ceeb ntawm electromagnetic khawb.
24V hloov fais fab mov, kev siv lub zog cia inductors thiab capacitors, muaj li ntawm L, C filtering Circuit Court kom ua tau raws li qhov sib txawv thiab hom kev cuam tshuam cov teeb liab lim, nrog rau kev hloov pauv ntawm AC square yoj teeb liab rau hauv DC teeb liab. Vim qhov kev faib tawm ntawm cov inductor coil, tus kheej-resonant zaus ntawm inductor kauj yog qis dua, yog li ntawd ntau tus lej ntawm cov khoom siv hluav taws xob ntau dhau los ntawm inductor coil thiab nthuav tawm sab nraud raws li AC fais fab mov kab lossis DC tso zis. kab. Lim capacitors, nrog qhov nce ntawm qhov zaus ntawm qhov kos teeb liab, vim yog lub luag haujlwm ntawm cov hlau lead inductance, ua rau muaj kev poob qis hauv capacitance thiab filtering nyhuv, kom txog thaum lub resonant zaus saum toj kawg nkaus poob ntawm lub capacitor lub luag hauj lwm thiab ua inductive. Kev siv tsis raug ntawm cov lim dej capacitors thiab cov hlau lead ntev kuj yog qhov ua rau muaj kev cuam tshuam ntawm electromagnetic.
Vim yog 24V hloov hluav taws xob muab hluav taws xob siab ceev, qib siab ntawm kev txawj ntse, nrog MCU microprocessor, yog li, los ntawm cov teeb liab hluav taws xob siab mus txog ze li ntawm ib txhiab volts, mus rau qhov hluav taws xob qis rau ob peb volts; los ntawm high-frequency digital signals, mus rau qhov tsawg-frequency analogue signals, lub hwj chim mov nyob rau hauv lub teb faib yog heev complex. PCB thaiv tsis tsim nyog, kev tsim qauv tsim tsis tsim nyog, cov kab hluav taws xob tawm tswv yim tsis tsim nyog, cov khoom siv hluav taws xob thiab cov khoom siv hluav taws xob txuas tsis tsim nyog thiab CPU, kev tshawb nrhiav Circuit Court tsim tsis tsim nyog. CPU, kev kuaj xyuas Circuit Court tsim yog tsis tsim nyog, yuav ua rau lub cev tsis ruaj khov lossis xws li electrostatic paug, hluav taws xob ceev ceev cov pa pulse pab pawg, xob laim, surge thiab conduction khawb, hluav taws xob khawb thiab hluav taws xob electromagnetic teb muaj peev xwm txo tau.
