Lub moj khaum kev ua haujlwm thiab cov ntsiab lus tseem ceeb
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 lub cuab yeej nrog cov hluav taws xob zoo hluav taws xob tau yuav tsum tsis cuam tshuam los ntawm cov ib puag ncig hluav taws xob ib puag ncig tsis muaj ua rau hluav taws xob cuam tshuam nrog ib 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.
