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2005-01-15    filter       ???÷: 205

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1 ·??¤??±?????

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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±?????????????????????????????????

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2.3 ???ü·??¤????

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3 ??±???????·??¤?÷????????

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3.1 ??????×è??????

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

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

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VmA=av/bc

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

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b.?¨?÷????????

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c.????

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3.2 ????·???????????

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3.3 TVS????????

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

VRWM=(0.8??0.9)VBR

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

PPR=K1KvcIp(t)

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?¨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????
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