Hloov fais fab mov compatibility nrog electromagnetic teb
Electromagnetic compatibility teeb meem tshwm sim los ntawm kev sib txuas lus switching fais fab mov yog heev nyuaj vim nws ua hauj lwm nyob rau hauv lub switching xeev ntawm high voltage thiab siab tam sim no. Nyob rau hauv cov nqe lus ntawm electromagnetic compatibility ntawm tag nrho cov tshuab, muaj feem ntau yog impedance coupling, kab-rau-kab coupling, hluav taws xob teb coupling, magnetic teb coupling thiab electromagnetic yoj coupling. Peb lub ntsiab lus ntawm electromagnetic compatibility yog: cuam tshuam qhov chaw, propagation path thiab interfered khoom. Co-impedance coupling feem ntau yog hais txog hluav taws xob sib txawv impedance ntawm qhov cuam tshuam qhov chaw thiab cov khoom cuam tshuam, los ntawm qhov cuam tshuam cov teeb liab nkag mus rau hauv cov khoom cuam tshuam. Kab-rau-kab coupling feem ntau yog kev sib txuas sib txuas los ntawm kev sib txuas ntawm cov xov hlau lossis pcb kab uas tsim cov kev cuam tshuam voltages thiab cuam tshuam tam sim no. 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 rau lub cev cuam tshuam. Qhov sib nqus teb sib txuas feem ntau yog qhov sib txuas ntawm qhov tsawg-zaus magnetic teb generated nyob ze ntawm high-tam sim no mem tes fais fab kab rau cov khoom cuam tshuam. Lub electromagnetic yoj coupling yog feem ntau yog vim lub high-frequency electromagnetic yoj generated los ntawm lub pulsating voltage los yog tam sim no, uas radiates sab nraud los ntawm qhov chaw thiab ob peb mus rau lub cev cuam tshuam. Qhov tseeb, txhua txoj kev sib txuas tsis tuaj yeem sib txawv, tab sis qhov tseem ceeb yog txawv.
Hauv kev hloov hluav taws xob hloov hluav taws xob, lub ntsiab hluav taws xob hloov hluav taws xob ua haujlwm nyob rau hauv lub tshuab hluav taws xob hloov pauv ntawm qhov hluav taws xob siab heev. Qhov hloov hluav taws xob thiab hloov tam sim no yog ob lub voj voos xwmfab, thiab cov zaus spectrum ntawm cov kev txiav txim siab siab uas muaj nyob rau hauv lub voj voog square tuaj yeem ncav cuag lub voj voog square. ntau tshaj 1000 zaug. Nyob rau tib lub sijhawm, vim qhov xau inductance thiab faib lub peev xwm ntawm lub zog hloov pauv, thiab lub xeev ua haujlwm ntawm lub zog hloov pauv lub zog tseem ceeb tsis zoo, thaum lub siab zaus qhib lossis kaw, lub zog siab thiab siab voltage ncov sib haum xeeb. oscillation yog feem ntau generated, thiab cov kev txiav txim siab Harmonics yog kis mus rau lub internal circuits los ntawm cov faib capacitance ntawm lub hloov raj thiab lub radiator los yog radiated mus rau qhov chaw los ntawm lub radiator thiab transformer. Hloov diodes siv rau rectification thiab freewheeling kuj yog ib qho tseem ceeb ua rau muaj kev cuam tshuam ntau zaus. Vim hais tias lub rectification thiab freewheeling diodes ua hauj lwm nyob rau hauv ib tug high-frequency switching xeev, vim hais tias ntawm tus kab mob parasitic inductance ntawm cov hlau lead nyob ntawm lub diodes, lub hav zoov ntawm junction capacitance, thiab rov qab tam sim no, lawv ua hauj lwm nyob rau hauv high voltage thiab tam sim no hloov pauv tus nqi, uas ua rau muaj ntau zaus oscillation. Vim hais tias cov rectifier thiab freewheeling diodes feem ntau yog nyob ze rau cov zis kab ntawm lub hwj chim mov, lub high-frequency cuam tshuam generated los ntawm lawv yog feem ntau yuav kis tau los ntawm DC tso zis kab.
Txhawm rau txhim kho qhov zoo ntawm lub zog, kev sib txuas lus hloov hluav taws xob txais kev 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 qhov kev ntxhov siab ntawm cov khoom siv hluav taws xob, ntau cov cuab yeej 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, qhov muag-switching uas tsis yog-kev puas tsuaj rau hluav taws xob feem ntau siv l thiab c rau kev hloov hluav taws xob, thiab siv cov unidirectional conductivity ntawm diode kom paub txog kev hloov pauv ntawm lub zog unidirectional. Yog li ntawd, lub diode nyob rau hauv resonant Circuit Court dhau los ua ib qho kev cuam tshuam loj ntawm electromagnetic cuam tshuam.
Hauv kev sib txuas lus hloov cov khoom siv hluav taws xob, lub zog cia inductors thiab capacitors feem ntau yog siv los tsim l thiab c lim circuits los lim cov hom sib txawv thiab hom kev cuam tshuam cov teeb liab thiab hloov AC square wave signals rau hauv DC teeb liab. Vim qhov kev faib tawm ntawm cov inductance coil, tus kheej-resonant zaus ntawm inductance coil raug txo, yog li muaj ntau cov kev cuam tshuam ntau zaus dhau los ntawm inductance coil thiab nthuav tawm sab nraud raws AC fais fab kab lossis DC tso zis. kab. Rau cov lim capacitors, raws li qhov zaus ntawm cov teeb liab cuam tshuam tau nce, vim yog cov nyhuv ntawm cov hlau lead inductance, lub capacitance thiab filtering nyhuv yuav txo qis mus txog rau thaum nws mus txog qhov resonant zaus thiab saum toj no, nws yuav plam lub luag hauj lwm ntawm lub capacitor thiab ua. inductive. Kev siv tsis raug ntawm cov lim capacitors thiab cov hlau lead ntev dhau los kuj yog qhov ua rau muaj kev cuam tshuam ntawm electromagnetic.
Kev sib txuas lus hloov hluav taws xob muaj hluav taws xob siab ceev, qib siab ntawm kev txawj ntse, thiab MCU microprocessor, yog li muaj cov cim hluav taws xob xws li los ntawm siab mus txog ze li ib txhiab volts mus rau tsawg li ob peb volts, los ntawm high-frequency digital signals mus rau tsawg zaus analog signals. , fais fab mov Lub internal teb faib yog heev complex. Tsis tsim nyog pcb thaiv, tsim qauv tsim tsis tsim nyog, tsis tsim nyog cov kab hluav taws xob input lim, tsis tsim nyog cov tswv yim thiab cov khoom siv hluav taws xob thaiv hluav taws xob, kev tsim tsis tsim nyog ntawm cpu thiab kev kuaj xyuas Circuit Court, tag nrho cov no yuav ua rau kev ua haujlwm tsis ruaj khov lossis txo qhov kev pheej hmoo ntawm electrostatic paug thiab hluav taws xob tsis ua haujlwm. Kev tiv thaiv kab mob rau cov tawg tsis tu ncua, xob laim tawm tsam, surges thiab ua cuam tshuam, hluav taws xob cuam tshuam thiab hluav taws xob electromagnetic teb.
Kev tshawb fawb ntawm electromagnetic compatibility feem ntau siv cov cuab yeej electromagnetic teb nrhiav tau nyob rau hauv cispr16 thiab iec61000 thiab ntau yam cuam tshuam cov teeb liab simulators thiab cov khoom siv pab cuam, hauv qhov chaw kuaj tus qauv lossis hauv chav kuaj, los ntawm kev soj ntsuam cov ncauj lus kom ntxaws thiab ua ke nrog kev nkag siab ntawm kev ua haujlwm hauv Circuit Court. Ua kev tshawb fawb analytical.
