??????????????????????????????

???????????????????????????????????????D??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
??????????????????????????????????????????????????????????????,????????????????85V?265V???5V?2A?????????100KHZ?
?????????????VOR????????????????????????????????????????????,?????? ?????????????????
???????????????????????????????????????????????????????????????????????????,java??,?????????????????????I=Vs*ton/L,???????????????????????????????????????????,???????????????????????????????????=VOR*toff/L,java,?????????????????????????????????????????????????????????????????VS*TON/L=VOR*TOFF/L,?????????????????????????????????,?????????????OOF??????D=VOR/?VOR+VS??????????????????????????????80V?VS?90V ??D=80/?*80+90?=0.47
???,???????????.
???????????,????,?????,????.,????????????,????????????,????,?????.?????????????,????????,????????,?????,?????,?????,???????????????????.??????????,?????????????????,??????????=????/??*VS????????????????????????????????????????????????????????????????????????????????????????????KRP???KRP?????????????????????????????????????????0?1??????????????KRP????????????????????????????????????????????????????*1???????????????*KRP*D+????*?1-KRP?*D?????????????????????=?????/?1-0.5KRP?*D,???????????????10W??????0.8.??????????10/0.8*90=0.138A,???KRP???0.6????=0.138/(1-0.5KRP).D=0.138/(1-0.5*0.6)*0.47=0.419A.
???????,??????????,??????????????,??????????,????,???????????????,?????????????????????????????,?????????????????????.?????????????????,?????????.????????,??????????,???KRP??????,???????,????????D????,??.????????????????.??????????????,??????????????,?????,???????????????????.
?????=????*????D*(KRP???/3-KRP+1)??????,?????=0.419*???0.47*(0.36/3-0.6+1)=0.20A.??????????,????????????,?????????????,???????,??????,??????,???.???????.
???,???????????.????????100KHZ???????10???,????0.47.??TON??4.7???.??????,?????.
???,???????,????????,??????,????,?????,????,????????????????,??????????????????????????,???????????.?????????.
???,?????,??????????,???,???????.?????????,??????????B,????????????????,?????????,???????????,??????,???????????,NP=VS*TON/SJ*B,????????????,?????,,??????,????,???\?????????,?????,???B???0.1?0.2??,????,?????????,????????????.????????????????,??????,??????,????????,??????????,??????=??????/??T??????,??????????????????????????????,???.????NP=90*4.7??/32????*0.15,??88?0.15???????.????,?????,????????,?????,???,??????????,,????????????,??????.??????????,??????,??0.25??????,?0.25??,????0.049????,???0.2?,????????4.08,??,?????????4?10??????.?????,????.??????,????????????????,??????????,???????.
???,?????????,?????.?????????,?????????,???????????????,?????,?????????5V,?????????,??5.6V,???80V?????,???5.6V?????,????????,??????????????????????.??????=NS*(UO+UF)/VOR,??UF???????.??????????88*5.6/80,?6.16,??6?.???????,????????????????,??????????,???????????????,???,????????,????.???????1-D,??????D,???????,??KRP ????????????????????????????,?,?????,????????????????????,????????????.
????????????,????????,??????????,??????????,TOP ??????5.7?9V,??7?,????????6V?,?????,??,????????,??????????,??????,???,??????????,??????????????,??????.
???,?????.????????????I=VS*TON/L.??????????????????,??I??:????*KRP,??L=VS.TON/????*KRP,????,????????????.
???,????,????????????????????????,?BMAX=L*IP/SJ*NP.???????????????,?????,????,????,?????????L?????????,??L=??/?????????,???????????,????????????????,???????,?????????????,?????????????,???????????????.BMAX????????0.3T ,??????,?????,????????,?????????,?????????.
????:
???????,??????????,??????????????????,???????????D,?????????????????VOR????,????????????,??KRP??,??????,?????????B,???????,??????,????????????????????.??????,????????????????,?????????????.??????D=VOR/(VOR+VS ) (1)
IAVE=P/??*VS (2)
IP=IAVE/(1-0.5KRP)*D (3)
I???=????*????D*(KRP???/3-KRP+1) (4)
NP=VS*TON/SJ*B (5)
NS=NP*(VO+VF)/VOR (6)
L=VS.TON/IP.KRP (7)

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