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TRƯỜNG ĐẠI HỌC SƯ PHẠM KỸ THUẬT

TP. HỒ CHÍ MINH

ELECTRICAL AND ELECTRONIC
PRINCIPLES
WEEK 5

Cuong Q. Ngo


Last classes
• Maximum power transfer

• MATLAB fundamentals
• Single frequency AC analysis (MultiSim)

2


CONTENTS (Today)
• Magnetically coupled circuits
• Transformer
• Resonance

3


1.Magnetically coupled circuits
• Mutual inductance
– Mutual inductance is the ability of one inductor to induce a

voltage across a neighboring inductor, measured in henrys
(H).
– If a current enters the dotted terminal of one coil, the
reference polarity of the mutual voltage in the second coil
is positive at the dotted terminal of the second coil

4


1.Magnetically coupled circuits
• If a current leaves the dotted terminal of one coil, the
reference polarity of the mutual voltage in the second coil is
negative at the dotted terminal of the second coil
•

5


1.Magnetically coupled circuits
• Model

6


1.Magnetically coupled circuits
• Example 1
• Calculate the phasor currents I1 and I2

7

1.Magnetically coupled circuits
• Answer

I1  13.01  49.39 A

I 2  2.9114.04 A

8


2. Transformer

Courtesy: Jensen Transformers
9


2. Transformer
• Ideal transformer
– Coils have very large reactances
– Coupling coefficient is equal to unity
– Primary and secondary coils are lossless

10