1. 1 Eeng 224 Chapter 13 Transformer 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

2. 2 Eeng 224 Different Transformers

3. 3 Eeng 224 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.

4. 4 Eeng 224 Three phase transformer connections  A Y-Y three phase transformer connection.  A Δ-Δ three phase transformer connection.

5. 5 Eeng 224 Transformer for Power Supply Application

6. 6 Eeng 224 (a) general appearance Fluorescent Lamp (b) internal view with ballast.

7. 7 Eeng 224 (a) Schematic of single-bulb fluorescent lamp; (b) starter; (c) internal view of ballast transformer. Fluorescent Lamp

8. 8 Eeng 224 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

9. 9 Eeng 224 DC Isolation  A transformer providing DC isolation between two amplifier stages

10. 10 Eeng 224 High Voltage Isolation  A transformer providing isolation between power lines and the voltmeter

11. 11 Eeng 224 Impedance Matching  A 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.

12. 12 Eeng 224 Impedance Matching Impedance Matching for public address system

13. 13 Eeng 224 Impedance Matching Transformer for TV Antenna

14. 14 Eeng 224 Power Distribution  A typical power distribution system