Electromagnetic Compatibility tsim rau hloov cov khoom siv fais fab
Electromagnetic sib raug zoo ntawm hloov hom fais fab khoom yog hais txog ntau yam khoom siv hluav taws xob tsis pub dhau ib qhov chaw tsawg tsawg tsis muaj kev txo qis hauv kev ua tau zoo. Nws suav nrog ob qho: Electromagnetic cuam tshuam (EMD) thiab electromagnetic rhiab (EMS). EMD hais txog lub suab nrov sab nraud tawm los ntawm cov khoom siv hluav taws xob tawm los ntawm cov khoom hluav taws xob muaj peev xwm tiv thaiv hluav taws xob hluav taws xob hluav taws xob. Ib qho cuab yeej nrog kev sib xyaw zoo Electromagnetic sib xyaw yuav tsum tsis muaj cuam tshuam los ntawm cov neeg nyob ib puag ncig hluav taws xob ib puag ncig tsis sib xws thiab ua rau hluav taws xob sab puag ncig.
Lub hwj huam hloov pauv hloov pauv hloov hluav taws xob tsim hluav taws xob thiab cov txheej txheem hluav taws xob tseem ceeb, tab sis cov zaus muaj kev cuam tshuam hauv hluav taws xob tseem ceeb, tab sis qhov ntau zaus ntawm kev cuam tshuam (<30MHz) is relatively low. The geometric dimensions of most low-power switching power supplies are much smaller than the wavelength corresponding to a 30MHz electromagnetic field (about 10m in air medium). The electromagnetic interference phenomena studied in switching power supply systems belong to the range of quasi steady fields. When studying their electromagnetic interference problems, the main consideration is conducted interference.
2 electromagnetic kev ua phem
Qhov kev sib tham ntawm cov hluav taws xob hluav taws xob feem ntau tau ua los ntawm peb qho: Cov yam ntxwv ntawm cov kev cuam tshuam ntawm kev cuam tshuam, ntsuas cov yam ntxwv ntawm lub cev ntxhov.
2.1 lub chaw nyob ntawm cov electromagnetic cuam tshuam nyob rau hauv hloov hom fais fab khoom
Qhov kev cuam tshuam hluav taws xob hluav taws xob daws cov peev txheej hauv kev hloov hom Fais fab khoom siv nrog cov khoom siv hluav taws xob, cov khoom siv tsis zoo, thiab tsis yog cov khoom siv siab ntev; Cov xaim hluav taws xob tsis raug ntawm cov ntawv luam tawm hluav taws xob kuj tseem yog qhov tseem ceeb ua rau hluav taws xob cuam tshuam nrog hluav taws xob hom khoom siv hluav taws xob.
2.1.1 kev cuam tshuam hluav taws xob hauv hluav taws xob tsim los ntawm kev hloov tsheb
Txhawm rau hloov cov khoom siv hluav taws xob, kev cuam tshuam hluav taws xob hauv hluav taws xob tsim los ntawm cov hloov tsheb circuit Court yog ib qho ntawm cov txiaj ntsig ntawm kev cuam tshuam. Cov hloov hluav taws xob yog qhov tseem ceeb ntawm lub tshuab hloov hluav taws xob, tsuas yog tsim ntawm kev hloov hlab thiab siab- zaus transformers. DV / DT tsim los ntawm nws yog ib tus mem tes nrog lub amplitude loj, ib qho dav dav, thiab ntau qhov kev sib raug zoo. Qhov laj thawj tseem ceeb rau cov mem tes cuam tshuam yog
1) Lub raj thauj ntawm cov raj hloov chaw yog thawj kauj ntawm lub siab- zaus transformer, uas yog qhov thauj khoom. Lub sijhawm thaum hloov lub raj xa mus, ib qho loj tshaj plaws yog tsim nyob rau hauv thawj kauj, thiab siab surge Peak voltage tshwm ntawm ob qho kawg ntawm thawj kauj; Lub sijhawm thaum hloov lub raj kaw, vim tias toast flux ntawm thawj kauj, ib feem ntawm lub zog tseem tsis tau kis los ntawm thawj kauj ruam rau theem nrab chev. Lub zog khaws cia nyob rau hauv lub inductor yuav tsim cov tshuaj photcillation nrog lub ncov siab nrog lub zog collector, uas yuav ua rau superimage Circuit Court, uas yuav ua rau lub zog hluav taws xob los ua ib qho hluav taws xob tig. Qhov hluav taws xob hluav taws xob cuam tshuam kev cuam tshuam cuam tshuam yuav ua kom zoo ib yam li kev hloov pauv Magnetizing impulse tam sim no thaum tus thawj coil txuas nrog. Cov suab nrov no yuav raug ua rau cov tswv yim thiab cov zis tso zis, tsim kev ntxhov siab, thiab muaj mob hnyav, nws yuav tsoo lub raj hloov.
2) Lub siab - zaus hloov cov voj voog tam sim no, thiab lim hlau hluav taws xob ua rau hluav taws xob hluav taws xob, tsim hluav taws xob ntau. Yog hais tias cov peev txheej lim ntawm lub capacitor tsis txaus lossis lub siab {{{12}} zaus {} Puab tsis zoo rau hauv hom kev sib txawv, sib sau ua ke cuam tshuam.
