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Power Electronics

Course Outline

 Chapter One: Introduction  

Principle devices and characteristics: diode, power transistor, thyristor (SCR), GTO and triac, SCR dynamic properties at switching ON and OFF. Methods of SCR turning ON, turning OFF and protection, trigger circuit design, series and parallel operation of SCR, cooling.

Chapter Two: Rectifiers  

Uncontrolled, half and full controlled, half and full wave rectifiers, single phase half wave, biphase, bridge, 3-phase half wave and bridge, and p-pulse rectifiers, effects of FWD, Specifications of devices and transformers.

 Chapter Three: Converter Operation  

Overlap, principls,2 pulse, 3 pulse, p pulse and bridge converters, FWD overlap, power factor and effects of overlap, regulation, inversion and delay angle control.

 Chapter Four: DC Line Commutation and Choppers

Inverter classifications, forced commutations and parallel capacitors, step down choppers, step up choppers.

 Chapter Five: Inverters  

Analysis of single phase bridge and center tapped source inverters, square and quasi-square wave output, operation of 3-phase bridge inverter, square and quasi-square wave output, inverter voltage and frequency control technique.

Chapter Six: Cyclo-converters  

Principles, circulating currents and blocked group operations, types and applications.

Chapter Seven: Single Phase AC Voltage Controllers  

AC regulators, transformer tap changers, control of multi-winding transformers, integral cycle control. 

Special Machines

Course Outline

DC servo mechanism

Armature -controlled DC motors, field-controlled DC motors, motor generator transfer function. 

Two-Phase Servo Motors

Main requirements of servos, two phase servo motor transfer function, the IM as a servo motor, drug cup construction, introduction to tacho generators and induction tacho generators.

Shaded Pole Motors

Construction, principle of operation, speed reversal and speed changing.

Universal and Single Phase AC Series Motors

Principles, torque and speed equations, small universal and large AC motors, speed changing, applications.

Single-Phase Repulsion Motors

Repulsion principles and repulsion motors, repulsion start IM, repulsion IM.

Stepper Motors

Permanent magnet stepper motors, variable reluctance stepper motors, torque-speed characteristics, step angle and speed.

Reluctance motors

Single and three phase reluctance motors, construction and principle of operation. Linear Induction Motor: Construction, principle of operation, applications