EMI Generation & Kev Tiv Thaiv hauv Hloov Cov Khoom Siv Hluav Taws Xob
Qhov teeb meem tseem ceeb ntawm cov khoom siv hluav taws xob hloov pauv yog lub peev xwm los tsim muaj zog electromagnetic cuam tshuam (EMI). EMI cov cim qhia muaj ntau qhov ntau zaus thiab qee qhov amplitude, thiab tom qab kev xa tawm thiab hluav taws xob, lawv tuaj yeem ua paug rau qhov chaw electromagnetic thiab ua rau cuam tshuam rau cov khoom siv sib txuas lus thiab cov khoom siv hluav taws xob. Yog tias tsis ua haujlwm zoo, lub zog hloov hluav taws xob nws tus kheej yuav dhau los ua qhov cuam tshuam. Qhov cuam tshuam ntawm electromagnetic cuam tshuam rau kev ua tau zoo, kev ua tau zoo, thiab kev siv cov khoom siv hluav taws xob hloov pauv tau dhau los ua ib qho kev txhawj xeeb ntxiv. Kab lus no txheeb xyuas qhov ua rau thiab kev nthuav dav ntawm electromagnetic cuam tshuam hauv cov khoom siv hluav taws xob hloov pauv, thiab nthuav tawm cov kev ntsuas zoo los cuam tshuam kev cuam tshuam.
Qhov tsis zoo ntawm cov khoom siv hluav taws xob hloov pauv yog lub peev xwm los tsim muaj zog electromagnetic cuam tshuam (EMI). EMI cov cim qhia muaj ntau qhov ntau zaus thiab qee qhov amplitude, thiab tom qab kev xa tawm thiab hluav taws xob, lawv tuaj yeem ua paug rau qhov chaw electromagnetic thiab ua rau cuam tshuam rau cov khoom siv sib txuas lus thiab cov khoom siv hluav taws xob. Yog tias tsis ua haujlwm zoo, lub zog hloov hluav taws xob nws tus kheej yuav dhau los ua qhov cuam tshuam. Qhov cuam tshuam ntawm electromagnetic cuam tshuam rau kev ua tau zoo, kev ua tau zoo, thiab kev siv cov khoom siv hluav taws xob hloov pauv tau dhau los ua ib qho kev txhawj xeeb ntxiv. Kab lus no txheeb xyuas qhov ua rau thiab kev nthuav dav ntawm electromagnetic cuam tshuam hauv cov khoom siv hluav taws xob hloov pauv, thiab nthuav tawm cov kev ntsuas zoo los cuam tshuam kev cuam tshuam.
1. Taw qhia
Electromagnetic compatibility (EMC) yog cov ntawv luv rau electromagnetic compatibility hauv lus Askiv. Nws suav nrog ob lub ntsiab lus: ua ntej, hluav taws xob hluav taws xob hluav taws xob tsim los ntawm cov khoom siv thaum lub sijhawm ua haujlwm yuav tsum raug txwv rau qee qib; Thib ob, cov khoom siv nws tus kheej yuav tsum muaj qee yam kev tiv thaiv kev cuam tshuam -, thiab nws yuav tsum muaj peb yam: cuam tshuam qhov chaw, txuas txuas, thiab lub cev rhiab heev. Lub zog hloov hluav taws xob uas muab lub zog rau cov hluav taws xob hluav taws xob yog qhov tseem ceeb hauv kev cuam tshuam kev cuam tshuam thiab ua kom muaj kev ua haujlwm zoo thiab ruaj khov ntawm cov tshuab hluav taws xob. Tsab ntawv xov xwm no nthuav tawm cov kev ntsuas zoo los tiv thaiv kev cuam tshuam los ntawm kev txheeb xyuas cov kev cuam tshuam thiab kev sib txuas hauv cov khoom siv hluav taws xob hloov pauv. Thiab tau npaj cov qauv tsim thiab kev tsim khoom ntawm kev hloov fais fab mov transformers.
2. Qhov chaw cuam tshuam thiab txuas txuas hauv cov khoom siv hluav taws xob hloov pauv
Hloov cov khoom siv hluav taws xob ua ntej kho AC lub zog rau hauv DC lub zog, uas tom qab ntawd tswj los ntawm kev hloov cov raj kom ua siab - zaus. Tom qab dhau los ntawm rectification thiab filtering circuits, ruaj khov DC voltage yog tau, uas muaj ib tug loj npaum li cas ntawm harmonic cuam tshuam. Lub caij no, vim qhov xau inductance ntawm lub transformer thiab lub ncov tshwm sim los ntawm qhov rov qab rov qab tam sim no ntawm cov zis diode, qhov sib txawv ntawm electromagnetic cuam tshuam yuav raug generated. Kev cuam tshuam hauv cov khoom siv hluav taws xob hloov hluav taws xob feem ntau yog tsom rau cov khoom siv hluav taws xob loj thiab cov kev hloov pauv tam sim no (xws li dv / dt lossis di / dt), tshwj xeeb tshaj yog hloov cov raj, tso zis diodes, thiab siab - zaus transformers. Meanwhile, stray capacitance tuaj yeem xa cov suab nrov ntawm daim phiaj hluav taws xob mus rau lub zog ntawm cov khoom siv hluav taws xob, ua rau muaj kev cuam tshuam rau kev ua haujlwm ntawm cov hluav taws xob circuits. Ntawm no peb yuav txheeb xyuas qhov ua rau ntawm ntau qhov cuam tshuam thiab lawv txoj kev sib txuas.
2.1 Cov kev cuam tshuam filtering generated los ntawm cov zis rectification thiab filtering Circuit Court ntawm lub switching fais fab mov feem ntau siv choj rectification thiab capacitor filtering circuits ntawm cov zis kawg. Vim lub nonlinearity ntawm rectifier diodes thiab lub zog cia cov nyhuv ntawm filtering capacitors, cov zis tam sim no dhau los ua ib ntus ncov tam sim no nrog lub sij hawm luv luv thiab siab ncov tus nqi,. Qhov kev hloov pauv tam sim no tsis muaj cov khoom siv tseem ceeb nkaus xwb tab sis kuj muaj ntau dua - xaj cov khoom sib haum xeeb.
