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2. . ??????????,?????????????????,???????????????,???????????????. 3. 3.1 ??????. ??????????????????????????????1. ???2. ??????(?? PNPN ???)3. ??????(???????? SCR)4. ?????(GTO)5. ???????(DIAC)6. ???????(TRIAC)7. ?????(PTR)8. ?????????(IGBT). 4. . ??? ???????????????????????????????? 3-1 ????????????????????,?????????? ??????-???????? 3-2 ???.

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    1. 1

    2. 2 ??????????,?????????????????,???????????????,???????????????

    3. 3 3.1 ?????? ?????????????????????????????? 1. ??? 2. ??????(?? PNPN ???) 3. ??????(???????? SCR) 4. ?????(GTO) 5. ???????(DIAC) 6. ???????(TRIAC) 7. ?????(PTR) 8. ?????????(IGBT)

    4. 4 ??? ???????????????????????????????? 3-1 ????????????????????,?????????? ??????-???????? 3-2 ???

    5. 5 ? 3-1 ??????? ? 3-2 ??????-???????

    6. 6 ?????????????????,??????????????????? ????????????????????????(peak inverse voltage,PIV)? ????????????????????????????????????????????,?????????????????

    7. 7 ??????? PNPN ??? ???????? PNPN ???,?????????????????(reverse-blocking diode-type thyristor)???????? 3-3 ??? ???-????????? 3-4???????????? 1. ????? 2. ????? 3. ???

    8. 8 ? 3-3 ??????? PNPN ???????

    9. 9 ??????,PNPN ????????????,?????????????????????????????,PNPN ??????????,????????????????? ? PNPN ???????,?????????????????(breakover voltage)VBO ??,???????????? PNPN ?????????? VBO ?,PNPN ??????????????

    10. 10 ??????? SCR ???????????????(silicon controlled rectifier,SCR),??????? SCR ??????? 3-5 ??? ??????????,SCR ??????,?????????????????????????????????,?? 3-6 ??,????????,???? iD ?? IH,?? SCR ???????

    11. 11 SCR 1. ? ?D ?? VBO ???? 2. ????? VBO ?????? iG ???????? 3. ? iD ?? IH ???? 4. ??????????? VR,???????????

    12. 12 ? 3-6 SCR ???-???????

    13. 13 ?????? ???(gate trun-off,GTO)?????????????????GTO?????????? iD ???? iH,???????????????????????? SCR?GTO ?????????? 3-7a ??? ? 3-7b ???????? GTO ???????????????????? GTO,???????????????,???? 20~30 ????????????????? GTO ??????????????????

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    29. 29 3.2 ??????

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    45. 45 3.3 ????

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    47. 47 3.5 ?????????——???

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    50. 50 3.6 ???

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