Kev daws rau electromagnetic compatibility ntawm switching circuits
Los ntawm qhov kev xav ntawm peb lub ntsiab lus ntawm electromagnetic compatibility, los daws qhov teeb meem ntawm electromagnetic compatibility ntawm kev hloov cov khoom siv hluav taws xob, peb tuaj yeem pib los ntawm peb yam: ua ntej, txo cov teeb liab cuam tshuam los ntawm qhov chaw cuam tshuam; thib ob, txiav tawm txoj kev nthuav tawm ntawm cov teeb liab cuam tshuam; thib peb, Txhim khu lub peev xwm ntawm lub cev thab plaub los tiv thaiv kev thab plaub. Thaum daws qhov sib xyaw ua ke ntawm kev hloov cov khoom siv hluav taws xob, cov saum toj no peb txoj kev tuaj yeem siv tau zoo, raws li tus nqi-zoo piv thiab qhov yooj yim ntawm kev siv. Yog li ntawd, kev cuam tshuam sab nraud tsim los ntawm kev hloov cov khoom siv hluav taws xob, xws li cov khoom siv hluav taws xob sib haum xeeb hauv cov kab hluav taws xob, ua rau muaj kev cuam tshuam hauv cov kab hluav taws xob, thiab hluav taws xob hluav taws xob hluav taws xob hluav taws xob cuam tshuam, tsuas yog daws tau los ntawm kev txo qhov cuam tshuam. Ntawm qhov tod tes, nws tuaj yeem txhim kho tus qauv tsim ntawm lub tswv yim / tso zis lim Circuit Court, txhim kho kev ua haujlwm ntawm APFC Circuit Court, txo qhov voltage thiab tam sim no hloov tus nqi ntawm lub hloov raj thiab lub rectifier thiab freewheeling diode, thiab txais yuav ntau yam mos switching circuit. topologies thiab tswj txoj kev; Ntawm qhov tod tes, Nyob rau hauv cov nqe lus ntawm cov yam ntxwv, ntxiv dag zog rau lub shielding nyhuv ntawm lub casing, txhim kho qhov sib txawv ntawm lub casing, thiab ua zoo grounding kev kho mob. Lub peev xwm los tiv thaiv kev cuam tshuam sab nraud (xws li surges thiab xob laim tawm tsam) yuav tsum tau ua kom zoo dua los ntawm kev ua kom pom kev tiv thaiv hluav taws xob muaj peev xwm ntawm AC input thiab DC output ports. Feem ntau, rau kev sib xyaw ua ke ntawm xob laim tawm tsam ntawm 1.2 / 50μs qhib qhov hluav taws xob hluav taws xob thiab 8/20μs luv Circuit Court tam sim no, vim yog lub zog me me, kev sib xyaw ua ke ntawm zinc oxide varistor thiab roj square raj feem ntau yog siv los daws qhov teeb meem. Rau cov hluav taws xob hluav taws xob hluav taws xob, TVS cov raj thiab cov kev tiv thaiv hauv av feem ntau yog siv rau hauv cov teeb liab me me ntawm cov chaw nres nkoj sib txuas lus thiab cov chaw nres nkoj, thiab cov hluav taws xob nyob deb ntawm lub teeb liab me me thiab lub chassis tau nce, los yog xaiv cov khoom siv los tiv thaiv static thab plaub. Fast transient signals muaj ib tug dav spectrum thiab kis tau yooj yim mus rau hauv lub tswj Circuit Court nyob rau hauv daim ntawv ntawm ntau hom. Tib txoj kev los tiv thaiv zoo li qub yog siv los txo cov kev faib tawm ntawm cov hom inductor thiab ntxiv dag zog rau cov hom teeb liab lim dej ntawm cov khoom siv hluav taws xob (ntxiv Hom Hom capacitors lossis qhov ntxig poob ferrite sib nqus rings, thiab lwm yam) txhawm rau txhim kho kev tiv thaiv. cuam tshuam kev ua haujlwm ntawm qhov system.
Txhawm rau txo qhov cuam tshuam sab hauv ntawm kev hloov hluav taws xob, paub txog nws tus kheej electromagnetic compatibility, thiab txhim kho kev ruaj ntseg thiab kev ntseeg siab ntawm kev hloov hluav taws xob, peb yuav tsum pib los ntawm cov hauv qab no: ① Ua tib zoo saib xyuas qhov tseeb zoning ntawm digital circuits thiab module Circuit Court. PCB thaiv; ② Digital circuits thiab Decoupling ntawm analog circuit fais fab mov; ③ Ib qho taw qhia hauv av ntawm digital circuits thiab analog circuits, ib qho taw qhia hauv av ntawm cov circuits loj tam sim no thiab cov me me tam sim no, tshwj xeeb tshaj yog tam sim no thiab voltage sampling circuits, kom tsis txhob muaj kev cuam tshuam kev cuam tshuam thiab kev cuam tshuam hauv av. Ua tib zoo saib qhov no thaum txuas. Qhov sib nrug ntawm cov kab uas nyob ib sab thiab cov teeb liab yuav tsum tau siv kom tsis txhob muaj kev sib tham, txo qhov chaw nyob ib puag ncig los ntawm cov zis rectifier Circuit Court, freewheeling diode Circuit Court thiab tributary lim circuit, txo qhov to ntawm transformer thiab faib capacitance ntawm lim inductor, thiab siv. high resonant zaus Lim capacitors, thiab lwm yam.
