開關(guān)電源中X電容和Y電容設(shè)計(jì)規(guī)則
開關(guān)電源的X電容設(shè)計(jì)準(zhǔn)則:
參考AD1118 X電容放置原則:
1.共模扼流圈前:105/275VAC(MKP/X2)
2.共模扼流圈后:474/275VAC(MKP/X2)
參考MW SP200-12 X電容放置原則:
1.共模扼流圈前:1uF/275VAC(MKP/X2)
2.共模扼流圈后:0.33uF/275VAC(MKP/X2)
參考MW S145-12 X電容放置原則:
1.共模扼流圈前:0.22uF/MKP-X2-250VAC/275VAC(GS-L)
2.共模扼流圈后:0.1uF/MKP-X2-250VAC/275VAC(GS-L)
一般兩級(jí)X電容,前一級(jí)用0.47uF,第二級(jí)用0.1uF;單級(jí)則用0.47uF.目前還沒有比較方便的計(jì)算方法。(電容容量的大小 和電源的功率無(wú)直接關(guān)系)
開關(guān)電源的Y電容設(shè)計(jì)準(zhǔn)則:
大地=PGND(or CHGND)
參考AD1118 Y電容放置原則:
1.市電輸入L/N線對(duì)大地:(2顆472/250V Y2)
2.市電經(jīng)過(guò)一級(jí)共模扼流圈后的兩線對(duì)大地:(2顆472/250V)
3.整流橋輸出的低壓端(變壓器初級(jí)低壓端)對(duì)大地:(1顆222/250V)
4.6組低壓直流輸出88V1對(duì)大地:(各1顆103/1KV Y1)
5.6組低壓輸出輔助電源AGND(變壓器次級(jí)低壓端)對(duì)大地:(共用1顆103/1KV Y1)
6.變壓器初級(jí)低壓端對(duì)變壓器次級(jí)低壓端:(共用1顆103/1kV Y1)
參考AD1043的設(shè)計(jì):
1.市電輸入L/N線對(duì)大地:(2顆222/250V Y2)
2.市電經(jīng)過(guò)1級(jí)共模扼流圈后的兩線對(duì)大地:(2顆472/250V Y2)
參考康殊電子的設(shè)計(jì):
1.市電輸入L/N線對(duì)大地:(2顆102/250V Y2)
2.市電經(jīng)過(guò)2級(jí)共模扼流圈后的兩線對(duì)大地:(2顆102/250V Y2)
3.整流橋輸出的低壓端(變壓器初級(jí)低壓端)對(duì)大地:(1顆332/250V Y2)
4.12V低壓直流輸出對(duì)大地:(1顆223/1KV DISC Y1)
5.變壓器初級(jí)低壓端對(duì)變壓器次級(jí)低壓端:(222/250V Y1)
參考MW S-145-12的設(shè)計(jì):
1.市電經(jīng)過(guò)1級(jí)共模扼流圈后的兩線對(duì)大地:(2顆222/2kV Y1)
2.整流橋輸出的低壓端(變壓器初級(jí)低壓端)對(duì)大地:(1顆222/2kV Y1)
3.12V低壓直流輸出GND對(duì)大地:(1顆103/1KV Y1)
參考MW S-200-12的設(shè)計(jì):
1.市電輸入L/N線對(duì)大地:(2顆472/250V Y2未上)
2.市電經(jīng)過(guò)1級(jí)共模扼流圈后的兩線對(duì)大地:(2顆472/250V Y2)
2.整流橋輸出的低壓端(變壓器初級(jí)低壓端)對(duì)大地:(1顆222/250V Y2)
3.PFC輸出高壓端對(duì)變壓器初級(jí)地:(1顆103/2kV Y1)
4.12V低壓直流輸出對(duì)大地:(1顆103/1KV Y1)
5.12V低壓直流輸出GND對(duì)大地:(1顆203/1KV Y1)
根據(jù)上述說(shuō)明,Y電容設(shè)計(jì)規(guī)則如下:(可適當(dāng)選擇)
1.市電輸入L/N線對(duì)大地:(2顆222/250V Y2)
2.市電經(jīng)過(guò)一級(jí)共模扼流圈后的兩線對(duì)大地:(2顆222/250V Y2)
3.整流橋輸出的低壓端(變壓器初級(jí)低壓端)對(duì)大地:(1顆222/250V Y2)
4.變壓器初級(jí)低壓端對(duì)變壓器次級(jí)低壓端:(共用1顆103/1kV Y1)
4.低壓側(cè)直流輸出對(duì)大地:(1顆103/1KV)
6.低壓輸出側(cè)GND對(duì)大地:(1顆103/1KV)
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