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# Part5 - Chng 5 C BAN VE KHUECH AI THUAT TOAN I KHUECH AI...

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32 V D V i R R 2 V o V + + V - - a V D V N =V - V D a I N =0 aV d V o V p =V + Chöông 5 : CÔ BAÛN VEÀ KHUEÁCH ÑAÏI THUAÄT TOAÙN I) KHUEÁCH ÑAÏI THUAÄT TOAÙN LYÙ TÖÔÛNG : I p=0 II) CAÙC CAÁU HÌNH KHUEÁCH ÑAÏI THUAÄT TOAÙN CÔ BAÛN : o Khueách ñaïi khoâng ñaûo : v - V + I I 1 2 < < Vo + - Vi R2 R1 = = = = = = - + ) 2 ( 0 ) 1 ( 2 1 I I i Z V V V A d i i OL I 2 = 2 2 0 R V V R V V i o - = - - (3) ; I 1 = 1 1 R V R V i = - (4) Töø 2 : 1 2 R V R V V i i o = - (5) ) 1 1 ( 1 2 2 R R V R V i o + = (6) Vi Vo + - i V R R ) 1 ( 1 2 + A OL = a = = d o V V (1) V d = V + - V - = 0 V + = V - (2) Z i = r d = = d d i V (3) i d = i N =i P = 0 (4) Z o = r 0 = 0 (5)

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33 V L 2 1 0 0 I I i Z V V A d i oL = = = = = = - + (1) (2) ) 4 ( ) 3 ( 2 1 2 1 R V R V R V V R V V o i o i - = - = - - - i o V R R V ) 1 ( 1 2 + = (7) 1 2 1 R R V V A i o vf + = = (8) L V V + - + - Vs R Rs Hay töø (8) cho R 2 =0 ta coù A vf =1; khi maïch KDTT khoâng lyù töôûng ta coù : ) 1 ( 1 1 ) 1 ( 1 2 1 2 a R R R R A vf + + + = (9) 2. Boä khueách ñaïi ñaûo : I 1 I 2 V V - M =R1//R 2 Vo + - Vi R R1 R2 A vf+= 1 2 R R V V i o - = (5) R M =R 1 //R 2 (6) ñeå caân baèng moät chieàu Khi boä KDTT khoâng lyù töôûng ta coù : + + - = a R R R R A vf 1 2 1 1 1 . 1 2 (7) 3. Boä khueách ñaïi toång : A oL = V + =V - (1) Maët khaùc : V + =V s (20 V - = V L (3) Do ñoù V s =V L 1 = = s L vf V V A (4)
34 A oL = 0 = = - + V V (1) Z i = f d I I I I i = + + = 3 2 1 0 (2) f o R V R V R V R V - = + + 3 3 2 2 1 1 (3) + + = - 3 3 2 2 1 1 R V R V R V R V f o (4) I f =R1//R2//R3// M I1 I2 I3 > > > Rf R Vo R2 R1 R3 V3 V2 V1 +Neáu R 1 =R 2 =R 3 =3R f töø 4 ta coù : 3 3 2 1 V V V Vo + + = - (6) : Boä khueách ñaïi laáy trung bình 4. Khueách ñaïi vi sai (khueách ñaïi tröø ) : I 4 > > > I1 I2 I 3 Vo V2 V1 R4 R3 R2 R1 + + - = + + - = - - 1 2 1 1 2 2 1 1 1 2 1 1 1 R R V V R R V R R V R V R V o o (5) 2 3 4 4 4 3 3 2 4 3 2 V R R R V R V R V R V R V R V V + = + = = - + + + + + (6) Töø(1 thay 6 vaøo 5 ta ñöôïc : 2 2 1 1 4 3 4 1 1 2 . V R R R R R R V R R Vo + + + - = (7) Neáu R 1 =R 2 =R 3 =R 4 hoaëc R 1

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Part5 - Chng 5 C BAN VE KHUECH AI THUAT TOAN I KHUECH AI...

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