Iòu khión bng m¹ch k z ti ui t mk u 1 c a k b ?

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§iÒu khiÓn b»ng m¹ch §K Z T¶i U,i t M§K U 1 c) A K B ë mçi nöa chu k× d ¬ng, tiristor cßn cha dÉn chõng nµo cha cã xung ®iÒu khiÓn. T¹i thêi ®iÓm , ®iÖn ¸p U AK d¬ng vµ cã xung ®iÒu khiÓn tiristor dÉn tõ ®ã ®Õn khi cã dßng ®iÖn b»ng 0. Sang nöa chu k× sau ®iÖn ¸p ®æi dÊu tiristor tù kho¸. Sang chu k× kÕ tiÕp lÆp l¹i t X §K 1 2
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5. Kho¸ tiristor §Þnh nghÜa viÖc kho¸ tiristor lµ chuyÓn tõ tr¹ng th¸i cã dßng ®iÖn vÒ tr¹ng th¸i kh«ng dßng ®iÖn (hay pn trë vÒ tr¹ng th¸i ban ®Çu) §iÒu kiÖn ®Ó kho¸ tiristor lµ ph¶i ®a dßng ®iÖn ch¹y qua nã vÒ 0 Cã thÓ hiÓu vÒ ®iÒu kiÖn nµy lµ ®Æt mét ®iÖn ¸p ngîc trùc tiÕp trªn hai ®Çu U AK <0, tiristor ®îc kho¸. ViÖc ®Æt ®iÖn ¸p ngîc nh thÕ kh«ng ph¶i khi nµo còng thuËn tiÖn, do ®ã cã mét sè c¸ch kho¸ nh sau:
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Mét sè s¬ ®å kho¸ tiristor trong m¹ch mét chiÒu Trong m¹ch ®iÖn xoay chiÒu tiristor tù kho¸ do dßng ®iÖn tù ®éng ®æi chiÒu theo ®iÖn ¸p, khi dßng ®iÖn b»ng 0 tiristor tù kho¸. Mét sè s¬ ®å kho¸ tiristor trong m¹ch mét chiÒu I T I N Hë m¹ch dßng ®iÖn Ng¾n m¹ch tiristor T¹o dßng ch¹y ng îc tiristor víi I T +I =0 a) b) c) U 1 U 1 U 1 Z T¶i Z T¶i Z T¶i
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Mét sè s¬ ®å m¹ch kho¸ tiristor b»ng m¹ch ®iÖn phô T 1 C L U1 Ud + D 0 T 1 C L Z d U 1 U d I d D 0 T 1 C L D 0 U d I d Z d U 1
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f. d. e. + - c. a. + - h. + - g. + - i. + - T 3 D 0 T 1 T 2 C L 1 Z d U 1 U d I d L 2 + - D 2 W 1 D 0 C L 1 Z d U d I d + - W 2 T 3 D 0 T 1 T 5 C Z d U 1 U d I d L 1 T 4 T 2 U 1 T 1 T 2 C L + - C L 1 - D 2 C - + - + - L 2 T 1 T 2 T 3 D 0 U 1 U d Z d I d T 2 T 3 U 1 T 1 D 0 Z d I d U d U 1 D 2 T 1 T 2 T 3 L 1 U d Z d + + T 1 T 2 C L D 1 Z d U d I d T 3 C L Z d U d I d L 2 D 0 T 4 T 5 C U 1 b.
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