Nekuda kwekuchinja hunhu kweiyo switching magetsi emagetsi, zviri nyore kukonzeresa switching magetsi kuti ibudise yakakura electromagnetic kupindirana kukanganisa.Seinjiniya yemagetsi, injinjiniya inoenderana nemagetsi, kana PCB yekumisikidza mainjiniya, unofanirwa kunzwisisa zvinokonzeresa matambudziko ekuenderana kwemagetsi uye wagadzirisa matanho, kunyanya marongero Mainjiniya anofanirwa kuziva nzira yekudzivirira kuwedzera kwenzvimbo dzakasviba.Ichi chinyorwa chinonyanya kusuma mapoinzi makuru emagetsi ekugadzira PCB dhizaini.
1. Misimboti yakati wandei: chero waya ine impedance;ikozvino nguva dzose inosarudza nzira ine zvishoma impedance;kusimba kwemwaranzi kune hukama neazvino, frequency, uye loop nzvimbo;common mode interference ine hukama nemutual capacitance yemasaini makuru edv/dt pasi;Nheyo yekudzikisa EMI uye kuwedzera anti-kupindira kugona yakafanana.
2. Chimiro chinofanira kugoverwa maererano nemagetsi, analog, high-speed digital uye yega yega inoshanda block.
3. Deredza nharaunda yedi/dt hombe loop uye kuderedza kureba (kana nzvimbo, hupamhi hweiyo hombe dv/dt chiratidzo mutsara).Kuwedzera kwenzvimbo yekutevera kuchawedzera iyo yakagoverwa capacitance.The general approach is: trace width Edza kuva yakakura sezvinobvira, asi bvisa chikamu chakawandisa), uye edza kufamba mumutsara wakatwasuka kuderedza nzvimbo yakavanzwa kuderedza mwaranzi.
4. Inductive crosstalk inonyanya kukonzerwa nehombe di/dt loop (loop antenna), uye induction intensity inoenderana nemutual inductance, saka zvinonyanya kukosha kudzikisa mutual inductance nezviratidzo izvi (nzira huru ndeyekudzikisa. iyo loop nzvimbo uye kuwedzera chinhambwe);Zvepabonde crosstalk inonyanya kugadzirwa nehombe dv/dt masiginecha, uye induction intensity inoenderana nekugona kuwirirana.Zvose zvinowirirana nezviratidzo izvi zvakaderedzwa (nzira huru ndeyokuderedza nzvimbo yekubatanidza inobudirira uye kuwedzera chinhambwe. The mutual capacitance inoderera nekuwedzera kwechinhambwe. Inokurumidza) inonyanya kukosha.
5. Edza kushandisa musimboti wekudzima loop kuti uwedzere kudzikisa nzvimbo yedi/dt loop hombe, sezvakaratidzwa mumufananidzo 1 (yakafanana neyakamonyoroka peya.
Shandisa musimboti wekudzima loop kuvandudza kugona kwe-anti-kupindira uye kuwedzera kureba kwekutapurirana):
Mufananidzo 1, Loop kudzima (yemahara wheeling loop yeboost circuit)
6. Kuderedza loop nzvimbo kwete chete kuderedza mwaranzi, asiwo kunoderedza loop inductance, kuita redunhu kushanda zvakanaka.
7. Kuderedza nzvimbo yechiuno kunoda kuti tinyatsogadzira nzira yekudzoka yenzira imwe neimwe.
8. Kana maPCB akawanda akabatanidzwa kuburikidza nekubatanidza, zvakakoshawo kufunga nezvekuderedza nzvimbo yechiuno, kunyanya kune makuru di / dt zviratidzo, zviratidzo zvepamusoro kana zviratidzo zvinonzwisisika.Zvakanakisisa kuti tambo imwe yechiratidzo ienderane netambo imwe yepasi, uye tambo mbiri dziri pedyo sezvinobvira.Kana zvichidikanwa, waya dzakamonyoroka dzinogona kushandiswa kubatanidza (kureba kwewaya imwe neimwe yakamonyoroka inowirirana nenhamba yakawanda yeruzha hafu-wavelength).Kana iwe ukavhura komputa kesi, unogona kuona kuti iyo USB interface pakati pebhodhi reamai uye pamberi pepaneru yakabatana neyakamonyoroka peya, iyo inoratidza kukosha kweiyo yakamonyoroka kubatana kwepairi kunopesana nekukanganisa uye kuderedza mwaranzi.
9. Kune data data, edza kuronga mamwe mawaya epasi mutambo, uye ita kuti idzi tambo dzepasi dzigovane zvakaenzana mutambo, iyo inogona kunyatso kuderedza loop nzvimbo.
10. Kunyange zvazvo mamwe ma-inter-board ekubatanidza mitsara ari ma-low-frequency signals, nokuti aya ma-low-frequency signals ane ruzha rwepamusoro-soro (kuburikidza nekufambisa uye nemwaranzi), zviri nyore kuburitsa mhere-mhere iyi kana isina kubatwa zvakanaka.
11. Paunenge uchiisa waya, tanga wafunga mitsara mikuru yemazuva ano uye mitsara inotarirwa nemwaranzi.
12. Kushandura magetsi emagetsi kazhinji ane 4 ikozvino zvishwe: kupinza, kubuda, kushandura, freewheeling, (Mufananidzo 2).Pakati pavo, iyo inopinza uye yakabuda ikozvino zvishwe zvinenge zvakananga ikozvino, inenge isina emi inogadzirwa, asi inovhiringidzika nyore nyore;iyo switching uye freewheeling ikozvino zvishwe zvine hombe di/dt, inoda kutariswa.
Mufananidzo 2, Yazvino loop yeBuck circuit
13. Gedhi dhiraivha redunhu re mos (igbt) tube kazhinji rinewo guru di/dt.
14. Usaisa zvikwangwani zviduku, zvakadai sekutonga uye analog circuits, mukati memazuva ano makuru, high frequency uye high voltage circuits kuti usapindira.
Zvichaenderera mberi…..