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Chapter 13Transformer Applications
Huseyin Bilgekul
Eeng224 Circuit Theory II
Department of Electrical and Electronic Engineering
Eastern Mediterranean University
Chapter Objectives: Understand magnetically coupled circuits.
Learn the concept of mutual inductance.
Be able to determine energy in a coupled circuit.
Learn how to analyze circuits involving linear and ideal transformers.
Be familiar with ideal autotransformers.
Learn how to analyze circuits involving three-phase transformers.
Be able to use PSpice to analyze magnetically coupled circuits. Apply what is learnt to transformer as an isolation device and power
distribution
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Different Transformers
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LVDT Transformer:
LVDT transformer: (a)
construction; (b) maximum
displacement; (c) minimum
displacement; (d) graph of
induced voltage versus
displacement.
The linear variable differential transformer (LVDT) is a sensor that can reveal displacement
using transformer effects.
A constant low-level ac signal is applied to the primary.
Voltage level induced in the secondary is based on core position, which is moved by some
external force. Position of the core can be related to the secondary voltage.
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Three phase transformer connections A Y-Y three phase transformer connection.
A - three phase transformer connection.
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Transformer for Power Supply Application
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(a) general appearance
Fluorescent Lamp
(b) internal view with ballast.
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(a) Schematic of single-bulbfluorescent lamp; (b) starter;
(c) internal view of ballast
transformer.
Fluorescent Lamp
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A transformer providing AC isolation in a rectifier circuit.
Electrical Isolation
Electrical ISOLATION exists between two devices when there is no physical
connection between them. A transformer provides AC isolation in a rectifier circuit
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DC IsolationA transformer providing DC isolationbetween two amplifier stages
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Impedance MatchingA transformer used as a IMPEDANCE MATCHING device
A transformer matching the speaker to the amplifier.
A transformer is used to
match the load resistance to
the source resistance to
provide Maximum Power
Transfer to the load.
A transformer is used to
match the loudspeaker to
the output impedance of
the amplifier.
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Impedance Matching
Impedance Matching for public address system
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Impedance Matching Transformer for TV Antenna
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Power Distribution A typical power distribution system