如圖這幾個器件是干嘛用的？正常的話一個二極管就OK了嗎?
PFC升壓二極管兩端并兩個串聯(lián)的二極管的作用
全部回復(fù)(12)
正序查看
倒序查看
@米老鼠
降低損耗用，主要是吸收主二極管反向恢復(fù)損耗，并近似無損的傳送到輸出端
1. Saturation core L206
is design to block the reverse recovery current of D229 and provide ZCS at the same time.
2. C236,D230 and D231 stores the
reverse energy while D229 off period
and then recycle it to Bulk at the
Q218,9 off moment.
3. C237, R282 and D232 bypasses L205’s current a small
period to let L206 saturated and then take over it’s current.
4. L206 Turn ratio Tr
= N2/N1 about 0.1, the
reverse recovery current is given as Irr=IL205 *Tr/(1-Tr).
For example, Tr=0.1, then Irr=IL205*0.1/(1-0.1)=(0.111)IL205
0
回復(fù)
@gbfdyx
1.SaturationcoreL206 isdesigntoblockthereverserecoverycurrentofD229andprovideZCSatthesametime.2.C236,D230andD231storesthereverseenergywhileD229offperiodandthenrecycleittoBulkatthe Q218,9offmoment.3.C237,R282andD232bypassesL205’scurrentasmallperiodtoletL206saturatedandthentakeoverit’scurrent.4.L206TurnratioTr=N2/N1about0.1,thereverserecoverycurrentisgivenasIrr=IL205*Tr/(1-Tr). Forexample,Tr=0.1,thenIrr=IL205*0.1/(1-0.1)=(0.111)IL205
解釋得非常好！
0
回復(fù)
@gbfdyx
1.SaturationcoreL206 isdesigntoblockthereverserecoverycurrentofD229andprovideZCSatthesametime.2.C236,D230andD231storesthereverseenergywhileD229offperiodandthenrecycleittoBulkatthe Q218,9offmoment.3.C237,R282andD232bypassesL205’scurrentasmallperiodtoletL206saturatedandthentakeoverit’scurrent.4.L206TurnratioTr=N2/N1about0.1,thereverserecoverycurrentisgivenasIrr=IL205*Tr/(1-Tr). Forexample,Tr=0.1,thenIrr=IL205*0.1/(1-0.1)=(0.111)IL205
這是什么資料上面的？
0
回復(fù)
@gbfdyx
1.SaturationcoreL206 isdesigntoblockthereverserecoverycurrentofD229andprovideZCSatthesametime.2.C236,D230andD231storesthereverseenergywhileD229offperiodandthenrecycleittoBulkatthe Q218,9offmoment.3.C237,R282andD232bypassesL205’scurrentasmallperiodtoletL206saturatedandthentakeoverit’scurrent.4.L206TurnratioTr=N2/N1about0.1,thereverserecoverycurrentisgivenasIrr=IL205*Tr/(1-Tr). Forexample,Tr=0.1,thenIrr=IL205*0.1/(1-0.1)=(0.111)IL205
這個位號都對得上？還是你改的？
是出自什么資料上的嗎？
0
回復(fù)
