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Copyright 2005 Lê Minh C ng 1
Chöông 6: Phaân tích maïch trong
mieàn thôøi gian
6.1 Giôùi thieäu
6.2 Phöông phaùp tích phaân kinh ñieån
6.3 Phöông phaùp toaùn töû Laplace
6.4 Phöông phaùp bieán traïng thaùi
6.5 Haøm truyeàn ñaït
http://www.khvt.com
Copyright 2005 Lê Minh C ng 2
6.1 Giôùi thieäu
Khaùi nieäm veà baøi toaùn xaùc laäp vaø quaù ñoä cuûa
maïch
Caùc baøi toaùn quaù ñoä thöôøng gaëp
Caùc phöông phaùp phaân tích quaù ñoä
http://www.khvt.com
Copyright 2005 Lê Minh C ng 3
Khaùi nieäm veà baøi toaùn xaùc laäp vaø
quaù ñoä cuûa maïch
Baøi toaùn xaùc laäp DC:
Ucxl = 12 V.
+_
2 K
2 F12 V ucxl
+
-
http://www.khvt.com
Copyright 2005 Lê Minh C ng 4
Baøi toaùn xaùc laäp AC :
Baøi toaùn xaùc laäp AC :
Töø maïch phöùc :
Neân :
Vaø bieåu thöùc xaùc laäp :
+
_
2 K
2 F
12cos(250t) V
ucxl
+
-
6
1 10
2
250.2
j j K
j C
2
12 6 2 45 ( )
2 2
o
Cxl
j K
U V
K j K
6 2 cos(250 45 )o
cxlu t V
http://www.khvt.com
Copyright 2005 Lê Minh C ng 5
Baøi toaùn quaù ñoä :
Baøi toaùn quaù ñoä :
Tröôùc khi ñoùng khoùa K:
maïch xaùc laäp vaø ta coù :
Ucxl1 = 12 V
Sau khi ñoùng khoùa vaø maïch
xaùc laäp : Ucxl2 = 6 V.
Daïng tín hieäu uc(t) khi t > 0
laø lôøi giaûi cuûa chöông 6
+
_
2 K
2 F12 V ucxl
+
- 2 K
t=0
K
http://www.khvt.com
Copyright 2005 Lê Minh C ng 6
Caùc baøi toaùn quaù ñoä thöôøng gaëp
Baøi toaùn quaù ñoä do
thoâng soá maïch thay
ñoåi (Baøi toaùn coù
khoùa)
Baøi toaùn quaù ñoä do
taùc ñoäng leân maïch
bieán thieân ñoät ngoät
(Baøi toaùn xung).
+
_
2 K
2 F12 V uc(t)
+
- 2 K
t=0
K
+
_
2 K
2 Fe(t)
uc
(t)
+
- 2 K
0
12 V
e(t)
t
1 ms
http://www.khvt.com
Copyright 2005 Lê Minh C ng 7
Caùc phöông phaùp phaân tích quaù ñoä
Phöông phaùp tích phaân kinh ñieån
Phöông phaùp toaùn töû Laplace
Phöông phaùp bieán traïng thaùi
Phöông phaùp tích phaân Duhamel vaø haøm
Green
Phöông phaùp hình aûnh pha
Phöông phaùp soá
http://www.khvt.com

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  • 1. Copyright 2005 Lê Minh C ng 1 Chöông 6: Phaân tích maïch trong mieàn thôøi gian 6.1 Giôùi thieäu 6.2 Phöông phaùp tích phaân kinh ñieån 6.3 Phöông phaùp toaùn töû Laplace 6.4 Phöông phaùp bieán traïng thaùi 6.5 Haøm truyeàn ñaït http://www.khvt.com
  • 2. Copyright 2005 Lê Minh C ng 2 6.1 Giôùi thieäu Khaùi nieäm veà baøi toaùn xaùc laäp vaø quaù ñoä cuûa maïch Caùc baøi toaùn quaù ñoä thöôøng gaëp Caùc phöông phaùp phaân tích quaù ñoä http://www.khvt.com
  • 3. Copyright 2005 Lê Minh C ng 3 Khaùi nieäm veà baøi toaùn xaùc laäp vaø quaù ñoä cuûa maïch Baøi toaùn xaùc laäp DC: Ucxl = 12 V. +_ 2 K 2 F12 V ucxl + - http://www.khvt.com
  • 4. Copyright 2005 Lê Minh C ng 4 Baøi toaùn xaùc laäp AC : Baøi toaùn xaùc laäp AC : Töø maïch phöùc : Neân : Vaø bieåu thöùc xaùc laäp : + _ 2 K 2 F 12cos(250t) V ucxl + - 6 1 10 2 250.2 j j K j C 2 12 6 2 45 ( ) 2 2 o Cxl j K U V K j K 6 2 cos(250 45 )o cxlu t V http://www.khvt.com
  • 5. Copyright 2005 Lê Minh C ng 5 Baøi toaùn quaù ñoä : Baøi toaùn quaù ñoä : Tröôùc khi ñoùng khoùa K: maïch xaùc laäp vaø ta coù : Ucxl1 = 12 V Sau khi ñoùng khoùa vaø maïch xaùc laäp : Ucxl2 = 6 V. Daïng tín hieäu uc(t) khi t > 0 laø lôøi giaûi cuûa chöông 6 + _ 2 K 2 F12 V ucxl + - 2 K t=0 K http://www.khvt.com
  • 6. Copyright 2005 Lê Minh C ng 6 Caùc baøi toaùn quaù ñoä thöôøng gaëp Baøi toaùn quaù ñoä do thoâng soá maïch thay ñoåi (Baøi toaùn coù khoùa) Baøi toaùn quaù ñoä do taùc ñoäng leân maïch bieán thieân ñoät ngoät (Baøi toaùn xung). + _ 2 K 2 F12 V uc(t) + - 2 K t=0 K + _ 2 K 2 Fe(t) uc (t) + - 2 K 0 12 V e(t) t 1 ms http://www.khvt.com
  • 7. Copyright 2005 Lê Minh C ng 7 Caùc phöông phaùp phaân tích quaù ñoä Phöông phaùp tích phaân kinh ñieån Phöông phaùp toaùn töû Laplace Phöông phaùp bieán traïng thaùi Phöông phaùp tích phaân Duhamel vaø haøm Green Phöông phaùp hình aûnh pha Phöông phaùp soá http://www.khvt.com