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标题: ?????à?·?????ü?????????????è??--zt [打印本页]

作者: ????    时间: 2004-4-19 12:51     标题: ?????à?·?????ü?????????????è??--zt

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(?????ó?§?????¤???§????????    ????    310027??

1    ????     ±????á?????à?·?????ü?????????????????????????ù???????ó???÷?????·DC/DC??????????????????9??15V??????????2?·?????·24V?????·5V??24V?????????±???????·?????????????????±?????????·??????????1?ù????


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??1    ???·?ò??     ??????????????±??¤?????ó??±??????????????·?????????·?á????24V???????????ó????Forward??5V????????????????Flyback??     ?????????·?????????????è??×??????é???? 2    ?????÷?è??     ????·??????????ú?·?è?????×???è??????????·????ò?????ü????×????·?è???????÷??????????PCB???è?????????????????¨?????????ú?·??????·????????????ù????????±????????????§????     ±????á?????ü?????????????????¤???¤×÷???????????÷???·??????????·????????á?°?ì????????????*?????ò????????×??????????????á????????×°?????????÷?á??°???????2?ù????????°??????÷??·???PCB°???±????????ù?×°????±???¨???×°????????×°???????????????????×°??°?×°???ó?ú°????¨×°?×??????×°???????à?????í???????????????§??×÷???????ù?????????÷??°?????????????±????????????§????????????·?????PCB°????????????¨????????????????×°??????????  



[???ù±???????2004-04-19 1:09 PM????±à??]
作者: ????    时间: 2004-4-19 12:56

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作者: ????    时间: 2004-4-19 12:58

??3    ???÷·???±??¤?°???÷±??¤???·


???????÷±??¤     ???????ü??????????????×°???????¨??????*?????ó·????????ù?????????????????÷±??¤??????????±??¤????????±??¤?°????±??¤?? 3.1    ??????±??¤     ??????±??¤???????????????????÷?ò?????·?±??????????????????????????±??¤???ò?????¨???????????????è?????????????ù????????±??¤????????±??¤????????????·?·¨????3?ù????·??????÷????????????PWM????L5991[1]????ISE???±??ISE???????ó??1V?±??L5991??????????????????????????????????±??¤?????????????????????????ò????·???????±????ì??????±??¤?????????÷??

[???ù±???????2004-04-19 1:10 PM????±à??]
作者: ????    时间: 2004-4-19 12:59

??4    RCD?ü?????·  

3.2    ??????±??¤     ??????±??¤????PI?·?????÷±??¤???ü??±??¤?±????°???????????°??????????????????????ü????????±??¤?????????ù???÷·???±??¤??????±??¤?????¨???????????????????????????????÷???????§??±??¤???ò???????????¤?±???????·?ò???÷????????????PI?·?????÷±??¤????????±?????????3?é???ò???????÷±??¤???·???ü????·??????÷???????????÷????×÷?????????????¨????????D1??R1??C1×é????·???±??????·??????·?×é????PI?·???????????ó??????????±????÷?????????÷???????¨?????±?ò?????ó?????????á????PWM??????????±????????????????÷±????????¨????????D2???????±???????÷???????÷???±??????·????·??????±???????????×÷???? 3.3    ????±??¤     ????±??¤???????·????×?????±?????±??¤?¨×?????±???????±??¤?±????????????????????1?ù?????±???·?????????????÷±??¤???????±?????¤?á??×°??????????°??????÷±??¤??×????è???á????×°??????±????ò?????????¤?±??(????????)?????·?ò???÷???è????±?????????±??¤??±?×°????????????×?????±????????±?????????????±??×?????±??????????????????????¨×?????????×?????±????????í?????????ò??×°?????ó?????·????????±??¤???±???·???÷±??¤?±?????·??×?????±??????????????????·?????????¤×÷??5V?????·????×?????±??????????????ü±??í?????????·???????????¨????????????????????±??¤???í??????5V????????±???????????×?????±??????á?°?ì???????÷?????? 4    RCD/RC?????ü??     ·??¤±????÷????±????÷?????????????±???????????±??????????D??S?????á?ú?ú±?????????????·?????????????·????ó???????????????????????±???á?ú?ú???????????ò????±????????ü?????·??????????RCD?ü?????·?????ò?à???×????????????????????±???????????RCD?ü??·??¤±????÷????4?ù????????6??????????????RCD?ü?????·???ó????????D??S????????????·??ó?ó???????????????????±???ú?ú???????ü?????????????????????ò??±????÷??±????????????????á????????????????????????????????????±???????????????±?R??C??D???????????????????°?ì?????ó???ò?????è?????????ü???·????????????????D??S????????RC?ü?????·?????é????????±????í?????§??????5????RCD/RC?????ü?????·????7?ù??????RCD?ü??·??¤±????÷??RCD/RC?????ü??·??¤±????÷??????Vds?????é?¨????  




作者: ????    时间: 2004-4-19 13:00

RCD/RC?????ü?????·
作者: ????    时间: 2004-4-19 13:01

(a)    Without snubber    (b)    RCD snubber

??6    ??RCD?ü?????·?°?óvds?????é?¨??

作者: ????    时间: 2004-4-19 13:02

(a)    RCD snubber    (b)RCD/RC snubber

??7    ??RCD?ü?????·?°RCD/RC?????ü?????·?óvds?????é?¨??

作者: ????    时间: 2004-4-19 13:03

(a)    ???????????¤±????÷  

5    ????RCD????     ???¤±????÷?????à??????·?????????????????????×é??????RCD???????????????????????é??????????±???????·?°???????RCD??????     ????8(a)?ù???????????????¤±????÷?????÷????S????????????????C???¨??????C??±????÷?¤??????Lm?????ú?ú?????????¨??±????÷????????8(b)?????????????¤±????÷???÷???¤×÷?¨????????VT??±????÷??????????iLm??±????÷???¤?????÷???????¨????????±????÷?????????????????????????????¨?????????????????ò?????????÷???????é?????????????????????????????????¨??????????????????±????÷??????????????·???????????????Ls???ü?????????ò????????C×?????????????????±????÷??????????C???????????????????????????¤????????????C????????????
作者: ????    时间: 2004-4-19 13:04

(b)    ???????????¤±????÷?¤×÷?¨??

??8    ???????????¤±??????·?°?¤×÷?¨??    


??9(a)?ù??????RCD???????¤±????÷??????±????÷????????????????????D??????C????×èR×é?????·??????????S?????±???¤??????????????????????????????D???¨????????C??????????±????÷????????9(b)??RCD???????¤±????÷???÷???¤×÷?¨????????C?????????????????????????ü?????±?÷???????òRCD??????????????·??¨?????ù??????????????????±????÷??????????????·???????±????÷?????????????á????????????????

作者: ????    时间: 2004-4-19 13:06

(a)    RCD???????¤±????÷  






(b)    RCD???????¤±????÷?¤×÷?¨??

??9    RCD???????¤±????÷???·?°?¤×÷?¨??  

作者: ????    时间: 2004-4-19 13:07

??????????RCD???????????÷×??????±??????????????????·????????±???ù±?????????????     1???ù??·ü?????????í??VT?????????????ù?????????????????????????????????????¨???ò???????????????¨?à??±???????????????S??VDS???????¨±?????????RCD????????????????·??¨???ù???????????????¨?à??±?????????????????S??VDS???????¨±???????     2?????????????¤±????÷±????÷??????????·??¨×???·?????vDS????????·???????±????÷????LS??????C?????ì????????RCD???????¤±????÷±????÷??????????·?????±????÷????LS????????S???á?????????ì??????????????C???????????ó????????S???á????????????????????·????????????????ó??RCD??????????·??????????????ò??????±????÷????LS???????????÷???????¨???é??????????????????????·?·ù????±?RCD????????????·?·ù???????à?????í?????????í???????????????????????¤±????÷????????D??S????????????C???????ü????????·???×÷????     3??RCD???????¤±????÷???¤????????????????????????????×èR?????????????????¤±????÷???¤?????????????????ù±?????????????????8(b)?????????????????????¤±????÷?????????¨???°??????C????????????Vin???ò????CVin2?????????????????????¨????????     4??????8(b)?°??9(b)iLm?¨???????????????????????¤±????÷±????÷????±?????????RCD???????¤±????÷±????÷???????ó??     ????·?????????????????????·????????¤±????÷?????÷×????????????±????±????÷???????????±?ò?è???????????ó?????±????????????????????????·????á???????????í???ü???÷×????±???????±????????????????????????RCD???????¤±????÷??     ??10(a)?ù????????????RCD???????¤±????÷???????????????·???ü???????????????¤±????÷??RCD???????¤±????÷???á??????10(b)??????RCD???????¤±????÷???÷???¤×÷?¨????????RCD???????¤±????÷????????????????·???5???×????  

作者: ????    时间: 2004-4-19 13:08

a)    ????RCD???????¤±????÷





(b)    ????????RCD???¤±????÷?¤×÷?¨??

??10    ????RCD???????¤±????÷???·?°?¤×÷?¨??     

?¨1???×??1??t0??t1??    t0?±???÷????S???¨??±????÷?????????????????¤?????÷???????????±±???????DR1???¨??     ?¨2???×??2??t1??t2??    t1?±??S???????×??·??ú???????????????????????ü???????ò????C2×??????ú?ú??????????·??¨??????????????C2?????????????ó?¤??????????????????????????C2???????ò±????÷???????????????????ù???±±????÷??????DR1?????????÷??????DR2???¨??     ?¨3???×??3??t2??t3??    ?±??????????????????C1????????????????D?????¨???¤?????÷?÷?ò????C1??????RCD??????×????????±?¤?????÷??????????????±??¤?????????????á?????????????????????????????????????????±?¤?????÷????????????×????á????     ?¨4???×??4??t3??t4??    ?¤?????÷???????????ó????????D??????????????C2???????????á???????¤?????????????????????±??C2???¤??????·??ú??????C2?????????????¤?????÷·??ò???????±??C2???????????????????????à??????????±????÷??????????????????×????á????     ?¨5???×??5??t4??t5??    ±????÷???????????????????????????????????????±±???????DR1?????¨???¤?????÷?÷??DR1???????????÷??×????á?????????÷???ù???????÷??DR2??????±??????¨???á????×???·??????????÷?????±DR1??DR2???????¨??±??¤??±????÷?????????????¤?????÷±?????±?????×??????±±???????????S?????????¨??     ????RCD???????¤±????÷????????C2?????????????????????????¤±????÷??????????C?????ù???????????×???¨?×??2???×??4??????????????????????±????ì???ù????????t2?±?????ê?????????é??????????RCD???????¤±????÷?????¨??????±????????????????üRCD???????¤±????÷?????¨??????????C2????C????±??????????á?????????ó???à???ò??????RCD???????¤±????÷±????÷????????·?±??????????????ó????±?RCD???????????à????????·?????????????RCD???????¤±????÷±????÷?????????¨?°??·??????????ò???????????????????????¤???????????¨????·????¤???????????????????????¨C2<C????±????÷?????¨???÷??????·??????¤?????÷?¨????·?????????RCD???????¤±????÷?????????????¤±????÷??RCD???????¤±????÷???????? 6    ±?????????????     ??????????×°?????????ó???÷?????????????ù??????????????·??ò?????????à?±???????????????¤±????÷?????÷??????DR2????11(a)?????¤±????÷??DR2?????????¨??????????????????????????·??????????????????????§?????ù?è?÷???????¨????????????????????????????·???????????????±?????????????????????????11(b)?ù?????????ó?ó?÷??????????·??ò?????????±?????á???????à??????????±????????ó????????DR2???????¨??????11(b)?ù????????????????±????????ó??DR2??????????·??????ü160V??????80V??

作者: ????    时间: 2004-4-19 13:09

(a)    ????±???????    (b)    ??±???????

??11    ??±????????°?óDR2???????????¨?? 7    ?á??     ±????????????ó·????????ü?????????????è???°???é???????????????????????????????????á???????????±?????????????????????ó???????????è???????¨???è??×÷???? ??


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???÷?????????????????????????ú??????????????????×?????????????????????????????±????÷????????×??÷????·?????????

作者: zona    时间: 2004-4-20 18:14

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