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Short Notes Magnetically Coupled Circuits - Network Theory (Electric Circuits) -
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Dot convention
If a current enters the dotted terminals of one coil, then induced voltage in second coil has a
positive voltage reference at dotted terminal of second coil.
If a current enters undotted terminals of one coil, then induced voltage n second coil as a positive
voltage reference at undotted terminals of second coil.
Series connection of coupled coils
eq 1 2
L L L 2M ? ? ?
eq 1 2
L L L 2M ? ? ?
Parallel connection of coupled coils
2
12
eq
12
L L M
L
L L 2M
?
?
??
2
12
eq
12
L L M
L
L L 2M
?
?
??
?
12
Coefficient of coup
M
k lg
L
n
L
i
Page 3
Dot convention
If a current enters the dotted terminals of one coil, then induced voltage in second coil has a
positive voltage reference at dotted terminal of second coil.
If a current enters undotted terminals of one coil, then induced voltage n second coil as a positive
voltage reference at undotted terminals of second coil.
Series connection of coupled coils
eq 1 2
L L L 2M ? ? ?
eq 1 2
L L L 2M ? ? ?
Parallel connection of coupled coils
2
12
eq
12
L L M
L
L L 2M
?
?
??
2
12
eq
12
L L M
L
L L 2M
?
?
??
?
12
Coefficient of coup
M
k lg
L
n
L
i
Equivalent circuits of linear transformers
T-equivalent circuit
a1
L L M ??
b2
L L M ??
C
LM ?
p- equivalent circuit
2
12
A
2
L L M
L
LM
?
?
?
2
12
B
1
L L M
L
LM
?
?
?
2
12
C
L L M
L
M
?
?
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