标题: ??×??ú?·????±???????·??¤
游客 220.248.27.x
未注册









发表于 2005-2-23 12:56 
??×??ú?·????±???????·??¤

??×??ú?·????±???????·??¤
2005-01-15    filter       ???÷: 205

??×??ú?·????±???????·??¤
??×??ú?·????±???????·??¤

  
????????×??ú?·????????????????±???????????????×??ú?·?????????ò??????????±???????·??¤???????????????????à?è??????????????????????·??¤??±??????????±?????é??????±???????·??¤?÷????·??à?°?????????????é??????????×??ú?·????±???????·??¤?÷??????????????·?·¨??

   ???ü??????±?  ????  ·??¤?÷??

1 ·??¤??±?????

???ù????????×??ú?·?????????????á????????????????????????????????????×??ú?·?????????????????ò????×??ú?·????°??????÷???¨°ü?¨?????????§???????????è?????????·????±??????ò?÷??????????????×??ú?·????????75%????????±?????????°??ì??????????????±????????????????????????×?÷??±?????????????????????×????á?ú?ú???ò·ü????????????????????????????×??ú?·?????????ü?±?????ò?????????á????×??ú?·??????????????×?????°???????±???????????±???????????·??¤????????·?·¨???????????ú???????????????ú???????????¨???????????ó????·????????ú??????????????×??????ù????????????????????×??????????è?????????ò?????±???????ó?????????????????????¨????±??????÷?????ó?????÷??????°?°??à????????·??¤·?·¨???????ú?????????????ü?????¨?????????????÷??????????????±?????????·??¤?÷????????????±????????¨??·??¤?÷?????·??×??????????ó?????????????????ú????????????±???????????·ù???ó?ó????????????·??¤·?·¨??????????°??ó?????ú????????????????????±???????·??¤?÷??×é???????????????à??·??¤???·??

2 ·??¤?÷????·??à?°????

2.1 ????????·??¤?÷??

????????·??¤?÷?????????èPN?á???ò?????¨VF????·??ò??±??÷???????¨Vz??????????????????±????????????????¨TVS?????ü?????????????????????????ò??±??÷???????????ò???è??????×è??TVS?÷???????¨??·??ò???????????????????????????????±?????????±?????¤×÷×è?????????????????????í?ó???÷?¨????????????óé?????¤?¨?????????????§??±??¤??×??ú?·???????????÷???????????????òTVS??????·?????·??ò?ü?????±?ó??????????°?????óé?????¤?¨?????????òTVS?????????÷???·??TVS??×??ó??????óé???????????ù??óé??????????AVS???÷???????÷??×??ó?±???????????÷???????÷??×????±??????????±?????óé??????????????????±????????§????????TVS?÷???????ü???????????????ì???????ì?¨????1ns??????????????±??????ó?????????á???????????????????±?????????ó???????÷?????????????ú??TVS?÷???????????????ú????·?×°????????DO-41??????°????????÷???ò???????????ò??????????·??????????????????úGeneral Instrument?????ú?ú400W??600W??1500W??????±?????·?????400W???¤×÷??????5.5??162V,??????TSMA6.8??TSMA200????????SMA/D0214AC??600W???¤×÷??????5.5??162V????????TSMB6.8??TSMB200????????SMB/D0214AA??1500W?¤×÷????5.5??162V????????TSMC6.8??TSMC200????????SMC/D0214AB???????????ú?ú?????????ù???ú?·????????TGL41-6.8??TGL41-200????????MELF GL41???????????ú?ú5000W??TVS?????¤×÷??????5.5??110V????????5KP5.0??5KP110,??????P600??TVS???í??·???·??ò????·????????ú?·?????°??????·????ú?·????·??§??2.8??3.8V?????ú×??????????í?÷??IC???è????

2.2 ?§??????·??¤?÷??

?§??????·??¤?÷?????????????????????????¤???????ò?????÷??????SCR??TRLAO?????ò???ó?à?????????·????????????????????±??¤??????????????·?SCR???????¤???????????·?????????????ì???±????100??s?????????????????÷?????????ì?????????ü?????????????÷???ó???±?????????????×±????????????????????????÷?????ò?????÷??????CSSPD?¨Curren type Silicon Surge Protective Device?????ü????±?????????????1998?ê10??????????????pnpnp????×é???????á?????????????????ò????×é?????????÷?????±????????????×?????????VBO?±???÷??±????¨?????±?ü??????°?PN?á???????????ò???????¨VF???????§?????¨?????¨VT????????±?±??¤???·?????????à?±?????¨?????????????¨??????·ü?????±?????÷???ó?????÷?????????????????÷?¨IH???????????????±?÷????±????¤×÷??????????????????±?±??¤???·?÷?????????????????÷??????????????

?¨1???÷?????±?÷·????????????¨Vs?????ì???±???¨s???????ü?ù±?????????????????????????????????

?¨2?????÷????·????????ó???÷·????????????ù±???±?????±???

?¨3?????????÷?????±?????÷?????±?÷·????????????ù±?±?????±???

?¨4?????÷????·????????ó??×????????ù±?±?????±???

?í???????÷?????????ì???????ì?????è?à??·??¤???·???????÷???ó????????????????????????????????±???????·??¤?×??????????±??????????????????à????????CSSPD????KP15N???????????????????????????????????????????ü????????CSSPD?¨KP4R20???????????÷???????¨SIWB60??????????KW4R????±????????¨?????·??·??¤??????±??¤??

2.3 ???ü·??¤????

???ü·??¤?????÷????????????????????·????????ü?????????????÷???ó???????????????±???????????????????±?÷????????????????????×??????ò??????????·??????????·?????à????????±????????ó???????á??????????????????????????????????ZnO???????????ü?????????????÷?????????ì??°???????????????????ZnO??????·????????ü????±??????????????????????????÷????????·??§???í????????·ü?????§·ü???ü?????????÷?????????????§°??à???ü·????????ì??·??????????ó???????????????÷?????ü?¤????±??????±????óé???????????????????????????à????????±????????ó???????á???????ò????????IC????????????·??§??????????????????·?×°????????????????????

3 ??±???????·??¤?÷????????

·??¤??????±?????????°??????÷?????????÷?????ú??????????·????÷????????±????????????ú?????????????????????????????ì?ò??°??ù?è??·??¤??????±?????????°??????÷????

???÷???????????????????????ò??°?TV×??????????à?¤×÷??????°??ù?è·????ì???ü???¨?ò???????????????????????????ú?ù?ì??????????

?????°??????

???¨?????·??

?????????????·??

?????????????????????????÷??TV?????????????à?÷????°???·?????±???????????????????????IC???ó????????????

?????????????ú?????????????ú???????ú???????ì??????

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

???????ú?÷?????·??

3.1 ??????×è??????

??????????×è?÷?°???????????????à????????????

??±ê???????¨?????????????????????¨?????????±?÷???÷??????????×è?÷??????????????

???????÷??????25???????????±????×??ó?????±?÷?????±????????×è?÷???÷???????÷????

????????????????????×è???¨??8/20???????÷?????±??????????????????·?????

???¨?÷????±í?????????¨?????????÷?¨8/20??s???¨???±??·??????÷??

???????·??????°ü?¨×??ó???????÷Ipm(?ò×??ó????????Vpm????????×è??Zo)???????????í??Tt???à????????????×????±??????Tm???°????????×è?÷???¤?¨?¤×÷???ü????????????????×?????N????

a.??????????????

??°?????????????×è?÷??????±?±??¤?÷???ò×°???????????????????é????????????×è??×è?÷???????±?÷?ò???÷??????????±ê??????????????????±????é??×????±???????????????¨??????????×??ó?????¤×÷????????×??ó?????¤×÷???????ù??????±ê????????????????????????????±??¤·????????????????????????ó?????????·????????????°?????????????????????

VmA=av/bc

??????a?????·?????¨??????????°???1.2??v?????·?±?÷?¤×÷?????¨???÷?±?????§??????b???????????ó??????°???0.85??c????????????????????°???0.9??

???ù??????????VmA???????????±?÷?¤×÷??????1.5±????????÷×?????????????·??????ò???????á???????ó1.414±????í?????????±??±???×?????

?¨1??±???±??¤???????¨??×??ó?±???????¤×÷?????????á????×??ó???í????·??ò????????????×è?????????ü??

?¨2?????????????ó?????????????????±?????±?????????????????????????????????????ù???¨??????±??????????????????ü??±ê??????????????×è?÷??

b.?¨?÷????????

?¨???ú?·???????¨?÷????°??ú?·±ê×????¨???¨???????÷???????????±?????????????é?±?ú?·?ù????????×??ó???÷???????ú?·?ù???????????÷?????¨????·ù?????????±???????????±???÷?¨??·ù??????50%?±???÷????????????±????ù??????????????????????×è?ù?ü???????????÷???????ú?·??×??ó?¨?÷????

c.????

??1?ù?????????????????÷???????·????????±?·??¤?±?????·??????????????????×è?????????????ó????·??à?????à????

???????à???????????????ò?????????ó??????????????????1?¨a???ù????×÷????????×è?÷??×??????ú±í???????????????????????°?¤?à???????????????????×?÷???????????????????????é????????×??ú?·??±??¤×÷??????°?????????????????×è?÷?????????????????????§????????????????????????×è?ò???????????ó?????????????????§??????????????????????????????????????×é?????????ò???????????????ü?????ü??×÷????

???????à??????????????????????1?¨b?????ü?÷??????????????????????±????????????????????ü??????·???????????????????°????????????????????????????????????????ù?????÷???à???????ó????????????????????R-C?????ü?????·??????

???????à??????????????????????1?¨c?????????????÷????????·???????????????????±????????·???é??·??ú????°?????????????????????×è?÷??????

???????à???÷??????°??????÷????±??¤??????????1?¨d????????????·????÷???????????è???ó????????????°??????÷??????°???????±??¤?÷????????·???????????????????±?±??¤?÷??????????????????°??????÷???????????§??±??¤??

3.2 ????·???????????

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

????·???????·ü????????±?±??¤?è±???·ü?????????????·???????????????ù?????·????????????????·?????????·??????????¨??????±?±??¤?è±???????????·??????????÷???????????????±?ò????±?±?±??¤?è±??????÷·??????????????ù???????§??±??¤??×??è±???

·???????·ü°???????±?±??¤????????±???·ü°????????????????·????·??????????÷?????ó????·????????????????¨???????à?????????¨??±?±?±??¤???è±???????????

3.3 TVS????????

????TVS?÷???°???????ü?????????ù???????????????÷??????

???÷??????VBR?????÷????·??ú?÷???????ò?????????¨?????é???÷???????ù???????÷????????????????

??×??ó?í??????VCMAX????·??????????÷????????×??ó??????????×??ó??????????×??ó???????????÷????????±?????????????????°???????????????1.33?¨??×??????¨?????????ò1.20?¨??50%?????¨??????????

??×??ó·??ò?¤×÷????VRWM?????????????÷??·??ò?¤×÷?±???????¨???????÷?????÷?????????????????¨??????

VRWM=(0.8??0.9)VBR

???????????????÷??????????????????

??×??ó·??ò·??????????÷IPP??????????????·??ò?¤×÷?????????????¨???????±?????÷???ù???í?¨????×??ó·??????????÷??

??·??ò·?????????·?PPR?¨TVS??????????????TVS??·??ò·?????????·?PPR??????·??ò·???IP??×??ó????????VCMAX???????????????????¨?????????????±???°?·????????????????

PPR=K1KvcIp(t)

??????K????????????K1??????????????????

??????Cpp??TVS???????ó?????è???????????÷???????????¨?????????ó???á?°?ìTVS?÷?????ì???±????

???????÷IR???±×??ó·??ò?¤×÷??????????TVS???±?ú?ú?????????¨???÷????×??ó?????÷???±TVS??????×è?????·?±???????????÷??????????????????

????±???????·??¤???·??????TVS?±????°?????×??????????????ò??

?¨1??×??ó????????VCMAX?????ó?????÷??×??ó???í°?????????

?¨2??×??ó·??ò?¤×÷????VRWM???????????·??×??ó?¤×÷????????°?????VRWM?????ò?????????·???¤×÷??????

?¨3?????¨??×??ó????????±????ó?????·????????×??ó??????????????

??2??????????TVS????????·??¤?÷????????·?·¨??

TVS?????ú??????·???·????????????ü????×??è±????ü????????????TVS???????ú???±?????¤?????ú???????????????????×???????????????????¤???????????????????????????????ü?à???????ü?????????ü????????????±?·??¤?÷??????Harris?????ú?ú??ML??MLA??MLE??MLN?????à????±??????????÷???????÷?????????????è??±??????????÷???°????????????????????×è?÷?????????????????????????à??????????????????????·??§?????í???è?????±???????à?????????ò????????????±?????????·??¤????×????ü?????í?????ü??????±????ü·??¤?÷???ü?ì???ì?????????????à??????±???????·??¤?????ó?????á?????????ú???ü??????×??ú?·?????????à?????ì????
?????????ú????×????÷???·





顶部
 



当前时区 GMT+8, 现在时间是 2024-3-29 21:44

    本论坛支付平台由支付宝提供
携手打造安全诚信的交易社区 Powered by Discuz! 5.5.0  © 2001-2007 Comsenz Inc.
Processed in 0.013903 second(s), 6 queries

清除 Cookies - 联系我们 - 我要委托设计网 - Archiver