Taw qhia rau Electromagnetic Compatibility ntawm Hloov Cov Khoom Siv Hluav Taws Xob
Cov laj thawj rau cov teeb meem electromagnetic compatibility tshwm sim los ntawm kev hloov cov khoom siv hluav taws xob ua haujlwm nyob rau hauv high voltage thiab high tam sim no switching tej yam kev mob yog heev complex. Nyob rau hauv cov nqe lus ntawm lub electromagnetic zog ntawm tag nrho cov tshuab, muaj ntau ntau hom: hom impedance coupling, kab rau kab coupling, hluav taws xob teb coupling, magnetic teb coupling, thiab electromagnetic yoj coupling. Common impedance coupling feem ntau yog hais txog qhov sib txawv ntawm qhov cuam tshuam ntawm qhov cuam tshuam thiab cov khoom cuam tshuam hluav taws xob, los ntawm qhov teeb meem cuam tshuam nkag mus rau qhov khoom cuam tshuam. Kab rau kab txuas feem ntau yog hais txog kev sib txuas ntawm cov xov hlau lossis PCB xov hlau uas ua rau muaj kev cuam tshuam qhov hluav taws xob thiab tam sim no vim yog cov xaim hluav taws xob sib txuas. Kev sib txuas hluav taws xob feem ntau yog vim muaj qhov sib txawv ntawm qhov sib txawv, uas tsim cov hluav taws xob hluav taws xob sib txuas ntawm lub cev cuam tshuam. Sib nqus teb coupling feem ntau yog hais txog kev sib txuas ntawm cov khoom siv tsawg zaus sib nqus tsim nyob ze cov kab hluav taws xob siab tam sim no rau cov khoom cuam tshuam. Electromagnetic teb coupling feem ntau yog vim lub high-frequency electromagnetic vuag generated los ntawm pulsating voltage los yog tam sim no radiating tawm sab nraud los ntawm qhov chaw, uas ua rau coupling nrog lub cev cuam tshuam. Qhov tseeb, txhua txoj kev sib txuas tsis tuaj yeem raug cais nruj me ntsis, tsuas yog muaj qhov sib txawv.
Hauv kev hloov hluav taws xob hloov hluav taws xob, lub zog hloov pauv tseem ceeb ua haujlwm nyob rau hauv ib qho kev hloov pauv ntawm qhov hluav taws xob siab, thiab qhov hloov hluav taws xob thiab tam sim no nyob ze rau cov xwm txheej tsis zoo. Los ntawm kev tsom xam spectrum, nws paub tias cov teeb liab yoj square muaj cov nplua nuj kev txiav txim siab zoo. Lub spectrum ntawm qhov kev txiav txim siab dua no tuaj yeem ncav cuag ntau dua 1000 npaug ntawm qhov xwm txheej square. Nyob rau tib lub sijhawm, vim qhov xau inductance thiab faib lub peev xwm ntawm lub zog hloov pauv, nrog rau qhov tsis zoo ntawm lub zog ua haujlwm ntawm lub ntsiab hluav taws xob hloov khoom siv, cov khoom siv hluav taws xob ntau thiab high-voltage peak harmonic oscillations feem ntau tsim thaum tig los yog tawm ntawm high zaus. Qhov kev txiav txim siab harmonics tsim los ntawm qhov kev sib haum xeeb no yog xa mus rau hauv Circuit Court los ntawm kev faib tawm ntawm lub raj hloov thiab lub dab dej kub, lossis tawg mus rau hauv qhov chaw los ntawm lub dab dej kub thiab transformer. Hloov diodes siv rau rectification thiab txuas ntxiv kuj yog ib qho tseem ceeb ua rau muaj kev cuam tshuam ntau zaus. Vim lub high-frequency switching xeev ntawm lub rectifier thiab freewheeling diodes, lub xub ntiag ntawm parasitic inductance thiab junction capacitance nyob rau hauv lub diode coj, raws li zoo raws li lub zog ntawm rov qab tam sim no, ua rau lawv ua hauj lwm nyob rau hauv high voltage thiab tam sim no hloov tus nqi, thiab tsim kom muaj ntau zaus oscillations. Rectifier thiab freewheeling diodes feem ntau yog nyob ze rau ntawm lub hwj chim tso zis kab, thiab cov high-frequency cuam tshuam los ntawm lawv yog feem ntau yuav kis tau los ntawm DC tso zis kab. Txhawm rau txhim kho lub zog ntawm cov khoom siv hluav taws xob, hloov cov khoom siv hluav taws xob txais yuav cov khoom siv hluav taws xob hloov kho hluav taws xob. Nyob rau tib lub sijhawm, txhawm rau txhim kho kev ua tau zoo thiab kev ntseeg siab ntawm lub voj voog thiab txo cov hluav taws xob kev ntxhov siab ntawm cov khoom siv hluav taws xob, ntau cov khoom siv hluav taws xob hloov pauv tau siv. Ntawm lawv, xoom voltage, xoom tam sim no, lossis xoom voltage / xoom tam sim no hloov tshuab yog siv dav tshaj plaws. Cov tshuab no zoo heev txo cov electromagnetic cuam tshuam los ntawm kev hloov khoom siv. Txawm li cas los xij, feem ntau cov mos hloov lossless nqus Circuit Court siv L thiab C rau kev hloov hluav taws xob, siv cov unidirectional conductivity ntawm diodes kom ua tiav unidirectional zog hloov. Yog li ntawd, lub diodes nyob rau hauv no resonant Circuit Court dhau los ua ib tug loj qhov chaw ntawm electromagnetic cuam tshuam.
Hloov cov khoom siv hluav taws xob feem ntau siv lub zog cia inductors thiab capacitors los ua L thiab C filtering circuits, ua tiav kev lim dej ntawm qhov sib txawv thiab hom kev cuam tshuam. Vim qhov kev faib tawm ntawm cov inductance coil, tus kheej resonant zaus ntawm inductance coil raug txo, uas ua rau muaj ntau qhov kev cuam tshuam ntau zaus dhau los ntawm inductance coil thiab nthuav tawm sab nraud raws li AC fais fab kab lossis DC tso tawm kab. Raws li qhov zaus ntawm cov teeb liab cuam tshuam ntau ntxiv hauv lub lim capacitor, cov nyhuv ntawm cov hlau lead inductance ua rau muaj qhov txo qis hauv capacitance thiab filtering nyhuv, thiab txawm tias cov kev hloov pauv hauv capacitor tsis, uas yog vim li cas rau electromagnetic cuam tshuam.
