21 Bam ap - 2.1 B¨m ¸p mét chiÒu 2.1.1 Băm áp m t chi...

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2.1. B¨m ¸p mét chiÒu 2.1.1. Băm áp m t chi u n i ti p ế 2.1.2. Băm áp m t chi u song song 2.1.3. Ho t đ ng c a các m ch đi n hình
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2.1.1. B¨m ¸p mét chiÒu nèi tiÕp 1. Nguyªn lÝ b¨m ¸p mét chiÒu nèi tiÕp U 1 Z d U d K H×nh 2.1 B¨m ¸p mét chiÒu nèi tiÕp; a. s¬ ®å nguyªn lÝ; b. ®êng cong ®iÖn ¸p. a. + _ U 1 t 1 U t 2 T CK U d t b.
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S¬ ®å nguyªn lÝ b¨m ¸p mét chiÒu nèi tiÕp giíi thiÖu trªn h×nh 2.1a. Theo ®ã phÇn tö chuyÓn m¹ch t¹o c¸c xung ®iÖn ¸p m¾c nèi tiÕp víi t¶i. §iÖn ¸p mét chiÒu ®îc ®iÒu khiÓn b¾ng c¸ch ®iÒu khiÓn thêi gian ®ãng kho¸ K trong chu k× ®ãng c¾t. Trong khoang 0 t 1 (h×nh 2.1b) kho¸ K ®ãng ®iÖn ¸p t¶i b»ng ®iÖn ¸p nguån (U d = U 1 ), trong kho¶ng t 1 t 2 kho¸ K më ®iÖn ¸p t¶i b»ng 0.
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TrÞ sè trung b×nh ®iÖn ¸p mét chiÒu ®îc tÝnh nÕu coi th×: • U d = . U 1 • f=1/T CK 1 ck 1 t 0 1 CK d U T t dt . U T 1 U 1 ck 1 T t U 1 t 1 U t 2 T CK U d t b.
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2. Ho¹t ®éng cña s¬ ®å víi t¶i ®iÖn c¶m S¬ ®å ®iÓn h×nh cã d¹ng Dßng ®iÖn ®îc x¸c ®Þnh bëi ph¬ng tr×nh vi ph©n Trong ®ã: i – dßng ®iÖn t¶i; R d - ®iÖn trë t¶i; L d - ®iÖn c¶m t¶i I - dßng ®iÖn ban ®Çu cña chu k× ®ang xÐt (më hay ®ãng kho¸ K); I XL – dßng ®iÖn x¸c lËp cña chu k× ®ang xÐt Khi kho¸ K ®ãng ; Khi kho¸ K më I XL = 0 - h»ng sè thêi gian ®iÖn tõ cña m¹ch L d U d K R d dt di L i . R U d d 1 d d T t XL T t bd e 1 I e . I i U,i t U d i d d d d R L T D 0 W ®t =Li 2 /2
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§é nhÊp nh« dßng ®iÖn ®îc tÝnh:
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