Optimized EMC tsim kev daws teeb meem rau kev hloov fais fab mov PCBs
Txoj kev cuam tshuam ntawm kev hloov pauv hloov suab nrov muab cov kev sib txuas rau qhov cuam tshuam thiab cov khoom siv cuam tshuam, thiab kev kawm txog nws txoj kev cuam tshuam ntau hom thiab qhov sib txawv hom cuam tshuam yog qhov tseem ceeb tshwj xeeb. Cov qauv high-frequency ntawm cov khoom tseem ceeb ntawm Circuit Court nrog rau cov qauv Circuit Court ntawm hom sib txawv thiab txawv hom suab nrov yog feem ntau txheeb xyuas los muab kev pab cuam rau EMC optimization tsim ntawm switching fais fab mov PCB.
Qhov cuam tshuam ntawm hom kev cuam tshuam thiab qhov sib txawv ntawm qhov cuam tshuam ntawm Circuit Court ntawm kev hloov hluav taws xob sib txawv. Feem ntau, qhov sib txawv hom suab nrov dominates ntawm tsawg zaus thiab hom hom suab nrov dominates ntawm lub siab zaus, thiab cov hluav taws xob cov nyhuv ntawm hom hom tam sim no feem ntau loj dua li ntawm qhov sib txawv hom tam sim no, yog li nws yog ib qho tsim nyog kom paub qhov txawv ntawm qhov sib txawv. hom cuam tshuam thiab hom kev cuam tshuam hauv kev siv hluav taws xob.
Txhawm rau kom paub qhov txawv ntawm qhov sib txawv ntawm hom kev cuam tshuam thiab kev cuam tshuam ntau hom kev cuam tshuam, peb yuav tsum tau kawm thawj zaug kev sib txuas ntawm cov khoom siv hluav taws xob hloov pauv, raws li peb tuaj yeem tsim txoj hauv kev hauv Circuit Court ntawm qhov sib txawv-hom suab nrov tam sim no thiab hom hom. suab nrov tam sim no. Lub conduction coupling ntawm switching fais fab mov yog mas:
Circuit-based conduction coupling, capacitive coupling, inductive coupling, thiab kev sib xyaw ntawm cov kev sib txuas no.
1 Hom hom thiab sib txawv hom suab nrov txoj kev qauv
Hloov lub zog hluav taws xob vim muaj qhov sib txawv ntawm cov khoom siv hluav taws xob ntau zaus CW ntawm lub hauv paus thiab theem nrab windings, lub hwj chim raj thiab cov dab dej kub ntawm qhov muaj qhov tsis muaj peev xwm CK, lub hwj chim raj muaj cov kab mob parasitic nrog rau cov xov hlau luam tawm vim yog kev tsim ntawm kev sib nrig sib inductance. , tus kheej-inductance, kev sib nrig sib capacitance, tus kheej-capacitance, impedance, thiab lwm yam parasitic tsis vim yog tsim ntawm kev sib nrig sib coupling, hom hom suab nrov thiab tsis zoo-hom suab nrov txoj kev, yog li tsim ib tug ntau hom thiab tsis zoo-hom conduction cuam tshuam. Lub suab nrov tam sim no txoj kev qauv ntawm lub converter tuaj yeem tau txais los ntawm kev tsom xam ntawm cov kab mob parasitic qauv ntawm cov khoom siv hluav taws xob hloov pauv, hloov pauv, thiab qhov tsis kam, inductance, thiab capacitance ntawm cov ntawv luam tawm.
2 High-frequency qauv ntawm lub ntsiab Cheebtsam ntawm lub Circuit Court
Cov kab mob parasitic inductance thiab capacitance ntawm lub hwj chim hloov raj cuam tshuam rau kev ua haujlwm siab ntawm Circuit Court. Cov capacitances no tso cai rau cov kev cuam tshuam ntau zaus ntws mus rau cov hlau substrate, thiab muaj ib qho CK capacitance stray ntawm lub hwj chim raj thiab lub dab dej kub, uas feem ntau yog grounded rau kev nyab xeeb vim li cas, uas muaj ntau hom suab nrov txoj kev.
Kev ua haujlwm ntawm PWM converter yog nrog rau kev ua haujlwm ntawm cov khoom siv hloov pauv thiab cov suab nrov sib xws. Raws li pom nyob rau hauv daim duab 1, rau ib tug ib nrab-bridge converter, qhov ntws voltage ntawm hloov Q1 yog ib txwm U1, thiab lub peev xwm muaj peev xwm txawv ntawm 0 thiab U1/2 raws li lub xeev hloov pauv; qhov peev xwm ntawm Q2 ib txwm yog 0, thiab cov dej ntws sib txawv ntawm 0 thiab U1/2. Txhawm rau kom muaj kev sib cuag zoo ntawm lub raj hloov thiab lub dab dej kub, ib qho insulating spacer feem ntau ntxiv ntawm hauv qab ntawm lub raj hloov thiab lub dab dej kub los yog insulating silicone nrog zoo thermal conductivity yog smeared rau hauv qab ntawm lub switching raj thiab lub lub dab dej kub. Qhov no ua rau lub ntsiab lus A mus rau hauv av yog sib npaug rau qhov muaj nyob ntawm ib qho kev sib txuas sib txuas ua ke capacitance CK, thaum lub xeev ntawm lub raj hloov Q1, Q2 hloov, kom lub ntsiab lus A muaj peev xwm hloov, nws yuav tsim suab nrov tam sim no Ick hauv CK, raws li pom nyob rau hauv daim duab 2. Cov tam sim no los ntawm lub dab dej kub rau lub chassis, thiab lub chassis, uas yog, lub ntiaj teb thiab lub ntsiab lub hwj chim kab muaj ib tug coupling impedance, tsim ntawm hom hom suab nrov txoj kev qhia nyob rau hauv daim duab 2 dotted kab. Raws li qhov tshwm sim, cov suab nrov nrov hom tam sim no ua rau lub zog poob thoob plaws qhov sib txuas impedance Z ntawm hauv av thiab cov kab hluav taws xob loj, tsim cov suab nrov nrov.
