R r r u u r r u i 2 tæn hao cng suêt khi bm p song

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R R R U U ; R R U i
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2. Tæn hao c«ng suÊt khi b¨m ¸p song song Trêng hîp tæng qu¸t Khi ®iÒu chØnh, chu k× xung ®iÖn ¸p kh«ng ®æi. Khi ®ã, cø t¨ng t 1 th× gi¶m t 2 vµ ngîc l¹i. Khi cÇn gi¶m ®iÖn ¸p t¶i, cÇn t¨ng t 1 vµ gi¶m t 2 , c«ng suÊt tæn hao trong biÓu thøc trªn t¨ng Do ®ã, b¨m ¸p song song kh«ng thÝch hîp khi t¶i nhËn n¨ng lîng tõ líi. 2 1 2 2 T hc 1 2 S hc t t t i R t i R P 2 1 2 d hc 2 1 1 hc 2 1 t t t R R U t R U P
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3. B¨m ¸p cã hoµn tr¶ n¨ng lîng vÒ nguån Trêng hîp nµy chØ xÐt khi t¶i cã søc ®iÖn ®éng (vÝ dô cÊp ®iÖn mét chiÒu vÒ nguån t¶i thuÇn trë) R d U d U 1 K E d - + D 0 i S i N i d a. b. 0 t t t T CK t 1 i S i N U d 0 0 t 1 - kho¸ K t 1 T CK - kho¸ Khë Dßng ®iÖn ch¹y ngîc vÒ nguån chØ tån t¹i khi E d >U 1
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XÐt trêng hîp khi t¶i ®iÖn c¶m vµ cã søc ®iÖn ®éng (vÝ dô ®éng c¬ lµm viÖc ë chÕ ®é h¹ t¶i) b. R d U d U 1 L d K E d - + D 0 i S i N i d a. 0 t t t T CK t 1 i S i N U d 0 0 t 1 - kho¸ K t 1 T CK - kho¸ Khë
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B¨m ¸p nèi tiÕp, song song kÕt hîp Trong trêng hîp t¶i lµm viÖc c¶ chÕ ®é nhËn n¨ng lîng vµ tr¶ n¨ng l îng, s¬ ®å phèi hîp nèi tiÕp vµ song ®îc sö dông. Khi nhËn n¨ng lîng tõ líi, ®iÒu khiÓn K N . Khi tr¶ n¨ng lîng vÒ líi, ®iÒu khiÓn K S . U d U 1 K S R d L d E d - + D 1 i S i N i d K N D 2
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2.1.3. Ho¹t ®éng c¸c m¹ch ®iÓn hinh 1. M¹ch BUCK CONVERTER 2. M¹ch BOOST CONVERTER 3. M¹ch BUCK-BOOST CONVERTER 4. CUK Converter 5. Flyback converter 6. Forward Converter 7. M¹ch Push - Pull 8. M¹ch nöa cÇu 9. M¹ch biÕn ®æi cÇu
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1. M¹ch BUCK CONVERTER S¬ ®å m¹ch vµ ho¹t ®éng cña BUCK CONVERTER (1) (2) (3) (4) (5) (6)
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ChÕ ®é dßng ®iÖn biªn liªn tôc (Vin - Vo ) DT + (-Vo) ddT = 0 Gi¸ trÞ dßng ®iÖn ®Ønh Gi¸ trÞ dßng ®iÖn trung b×nh Dßng qu¸ ®é
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Th«ng sè cho m¹ch æn ¸p b»ng BUCK gi¶m ¸p
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2. M¹ch BOOST CONVERTER S¬ ®å vµ ho¹t ®éng Khi T dÉn Khi T kho¸ W ®t =Li 2 /2 + +
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