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University of Management & Technology School of Science & Technology Department of Electrical Engineering EE-446L Power Electronics Lab Lab Schedule As per timetable Pre-requisite EE_111: Circuits Analysis EE_209: Electronic Devices and Credit Hours Circuits Resource Persons Office Nauman Ahmad (Coordinator) [C1] Farah Sarwar [A2] Salman Khalid [A1,B1,B2,D1] C1-16, Workshop Lab Fall 2014 Semester Contact 2 [email protected] [email protected] [email protected] Office Hours See office window Lab Work Objectives This course provides an introduction to power electronics and its applications. The course starts with coverage of modern power semiconductor devices, their characteristic, and drive circuit design. Topologies of power electronic circuits including single phase and three phase ac-dc rectifiers, ac-ac voltage controllers, dcdc converters, and dc-ac inverters will be covered along with their control techniques. Applications of modern power electronic devices are also included with emphasis on switch mode and linear regulators. These objectives confirm to the ones’ listed in HEC guidelines as a, d, e, & f. Expected Outcomes In accordance with HEC curriculum outcomes a, d, & k, students at the end of the course should be able to: Develop and quantify common performance objectives for power electronic circuits. Develop simple power electronic converter topologies to meet certain functional specifications. Analyze power electronic converter operation to develop design guidelines for choice of switching devices and reactive elements. Grading Policy Final Viva: 60%, Sessional (Each lab evaluation) = 40%. Lab Schedule Exp # Experiment Name 1. Single phase half wave uncontrolled rectifier with R, RL load Equipment used Study Material Oscilloscope ,Function Generator, Half wave Rectifier Operation with Bread board, diodes, resistors, resistive and inductive load, wave inductor, connecting wires form distortion due to energy storage phenomenon , Form Factor , Ripple Facto, Rectifier Efficiency , Crest Factor , Free wheeling diode significance ,etc. 2. . Single phase full wave uncontrolled rectifier with R,RL load Oscilloscope ,Function Generator, Full wave Rectifier Operation with Bread board, diodes, resistors, resistive and inductive load, wave inductor, connecting wires form distortion due to energy storage phenomenon , Form Factor , Ripple Facto, Rectifier Efficiency, Free wheeling diode significance etc 3. DC A simple series voltage regulator Supply ,Bread board, Understanding of Series topology of Transistor, Zener Diode, resistors, regulator, Line and load regulation, connecting wires effect of line and load variations on conduction level of BJT 4. DC A simple shunt voltage regulator Supply ,Bread board, Understanding of Shunt topology of Transistor, Zener Diode, resistors, regulator, Line and load regulation, connecting wires effect of line and load variations on conduction level of BJT 5. DC An improved variable output series voltage regulator Supply ,Bread board, Understanding of Improved Transistor, Zener Diode, resistors, topology of regulator, Line and load connecting wires regulation, effect of line and load variations on conduction level of BJT 6. DC A variable voltage regulator using op-amp with over current protection 7. VI Characteristics of Thyristor Supply ,Bread Transistor, Zener Amplifier, resistors, board, Diode, OP connecting Understanding of OP-AMP topology of regulator, Line and load regulation, effect of line and load wires variations on conduction level of BJT Oscilloscope ,Function Generator, SCR DC Supply ,Bread board, SCR, characteristics, resistors, connecting wires region, forward conduction region, forward and forward reverse blocking reverse blocking region, latching and holding current, forward break over voltage. etc Mid Term 8. SCR using R firing circuit Oscilloscope ,Function Generator, Firing and conduction DC Supply ,Bread board, SCR, variations and their effect on output resistors, connecting wires voltage, current and Power for half and full wave rectifiers angle 9. SCR using RC firing circuit Oscilloscope ,Function Generator, Firing DC Supply ,Bread board, SCR, variations with increased range and Capacitor,resistors, their effect on output voltage and connecting wires and conduction angle Power for half and full wave rectifiers 10. Single phase half wave controlled rectifier with R,RL load 11. Single phase full wave controlled rectifier with R,RL load Oscilloscope ,Function Generator, Single phase Controlled Half wave Three Phase Supply ,Bread board, rectifier operation with R and RL SCRs, resistors, connecting wires load Oscilloscope ,Function Generator, Single phase Controlled Full wave Three Phase Supply ,Bread board, rectifier operation with R and RL SCRs, resistors, connecting wires load 12. Buck and Boost operation, designing Design and simulation of Buck regulator and Boost regulator of critical values of capacitors and PSIM/ORCAD/MULTISIM/PROTEUS inductors, duty cycle effect, switching topology understanding 13. Buck and Boost operation(combined), designing of Design and simulation of Buck-Boost regulator PSIM/ORCAD/MULTISIM/PROTEUS critical values of capacitors and inductors, duty cycle effect, switching topology understanding 14. Oscilloscope ,Function Generator, VI Characteristics of UJT for cut off, SCR power control using UJT phase DC Supply ,Bread board, SCR, negative resistance and saturation control UJT,resistors, connecting wires region, relaxation oscillator Final Viva