12 Tiristor (SCR) - 1.2 Tiristor...

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1.2. Tiristor - Thyristor (silicon- controlled rectifier - SCR) 1. Nguyªn lÝ cÊu t¹o 2. §Æc tÝnh, th«ng sè 3. KÕt cÊu 4. Më tiristor 5. Khãa tiristor 6. KiÓm tra
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1. Nguyªn lÝ cÊu t¹o CÊu t¹o tõ bèn chÊt b¸n dÉn ®Æt liªn tiÕp nhau. NÕu ®Æt ®iÖn ¸p ngoµi vµo trong c¸c tiÕp gi¸p trªn cã mét tiÕp gi¸p ngîc • U AK >0 cã J 2 ngîc • U AK <0 cã J 1 , J 3 ngîc C¶ hai trêng hîp nµy ®Òu kh«ng dßng ®iÖn. Muèn cã dßng ®iÖn ch¹y qua pn cÇn cã dßng ®iÖn ®iÒu khiÓn (xo¸ ®i mét cÆp b¸n d©n nµo ®ã) CÊu t¹o p - n cña tiristor A J 1 J 2 J 3 K p 1 n 1 p 2 n 2
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Nguyªn lÝ lµm viÖc lo¹i ®iÒu khiÓn tõ anod §a thªm mét cùc G (gate) vµo n 1 Khi cã ®iÖn trêng U AK >0 , cã dßng ®iÖn i AG cÆp b¸n dÉn p 1 , n 1 thµnh d©y dÉn, khi ®ã A coi nh ®îc ®Æt trùc tiÕp vµo p 2 , khi ®ã xuÊt hiÖn dßng i AK Khi ®· cã dßng i AK , dßng ®iÒu khiÓn kh«ng cßn ý nghÜa n÷a . C¸c chÊt b¸n dÉn p,n chØ trë vÒ tr¹ng th¸i ban ®Çu khi ngng dßng ®iÖn K p 1 p 2 n 1 n 2 A G a) J 1 J 2 J 3 i AG i AK
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Nguyªn lÝ lµm viÖc lo¹i ®iÒu khiÓn tõ Katod §a thªm mét cùc G (gate) vµo p 2 Khi cã ®iÖn trêng U AK >0 , cã dßng ®iÖn i GK cÆp b¸n dÉn p 2 , n 2 thµnh d©y dÉn, khi ®ã K coi nh ®îc ®Æt trùc tiÕp vµo n 1 , khi ®ã xuÊt hiÖn dßng i AK Khi ®· cã dßng i AK , dßng ®iÒu khiÓn kh«ng cßn ý nghÜa n÷a . C¸c chÊt b¸n dÉn p,n chØ trë vÒ tr¹ng th¸i ban ®Çu khi ngng dßng ®iÖn A K G p 2 p 1 n 1 n 2 b) T 1 T 2 K p 1 p 2 n 1 n 2 A G J 1 J 2 J 3 i GK i AK a) c) + _ +
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2. §Æc tÝnh vµ th«ng sè §Æc tÝnh cã d¹ng nh h×nh bªn Th«ng sè: Cã c¸c th«ng sè nh diod ®· nãi ë trªn C¸c th«ng sè riªng cña tiristor
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