Scope of Learning

This module is designed to cover several key concepts in power electronics. The learning scope includes:

• Rectifiers: Half-wave, Full-wave, and Bridge configurations for both uncontrolled and controlled rectifiers (with or without freewheeling diodes).

• Motor Drives: Includes various motor loads such as lamp loads, motor loads, and motor loads with freewheeling diodes.

• Firing Circuits: Study of ramp and comparator firing circuits for different types of rectifiers and converters.

• Converters: Includes study of cycloconverters, inverters, and choppers (step-up and step-down).

• PWM Control: Study of Pulse Width Modulation (PWM) circuits for motor control and other power electronics applications.

Technical Specifications

• Power Supplies:

  • Single Phase AC Power Supply: 110-220V, 50/60Hz

  • Three Phase AC Power Supply: 230V Phase, 415V Line Voltage ±10%, 50Hz

  • Low Voltage AC/DC Power Supplies: For various loads and control circuits.

• Components:

  • Diode Assembly: 25A diodes for high current applications.

  • SCR Assembly: 1200V/25A for rectifier control.

  • IGBT Assembly: IGBT G4BC20S 600V/10A for high-frequency control.

  • PWM Circuit: Triangular Comparator Method, frequency range 270Hz to 5kHz.

• Meters & Oscilloscopes:

  • Digital AC/DC Voltmeters & Ammeters: For voltage and current measurements.

  • Oscilloscope with Power Scope: 30MHz bandwidth and 1500V isolated measurement.

• Firing Circuits:

  • Single Phase Firing Circuit: 30-180 degree firing angle control.

  • Three Phase Firing Circuit: 30-150 degree firing angle control.

  • Cycloconverter Firing Circuit: 30-180 degree control.

Features

• Power Circuit and Firing Circuit:

  • Onboard rectifiers, inverters, and controlled circuits for practical learning.

  • Replaceable modules for easy upgrades or repairs.

• Safety Features:

  • Short-circuit protection with MCBs (Miniature Circuit Breakers).

  • Indicator lights for mains power status.

• Onboard Components:

  • Single Phase and Three Phase Power Supplies: Both mains and low-voltage versions.

  • Pulse Amplifier & Isolation: Ensures safe and reliable control signals for rectifiers and inverters.

  • Load Assemblies: Includes bulbs (200W), PMDC motor, induction motors (both single-phase and three-phase).

• Physical Design:

  • Front panel with clearly printed circuits and symbols for ease of operation.

  • Metal cabinet housing for durability and safety.

  • Wheels on the workstation for easy movement and portability.

List of Experiments

The module offers a wide range of experiments to learn and apply power electronics concepts:

Rectifiers:

• Uncontrolled Rectifiers:

  • Half Wave on Lamp and Motor Loads.

  • Full Wave on Lamp and Motor Loads.

  • Bridge Uncontrolled Rectifiers with and without freewheeling diodes.

• Controlled Rectifiers:

  • Half Wave Controlled Rectifiers.

  • Full Wave Controlled Rectifiers.

  • Bridge Controlled Rectifiers with and without freewheeling diodes.

• Semiconverter Configurations:

  • Common cathode, common anode, and asymmetrical configurations on various loads (lamp and motor).

Converters and Inverters:

• Choppers: Step-up and Step-down chopper circuits.

• Inverters: Bridge inverters for DC to AC conversion.

• Cycloconverters: Conversion between different AC frequencies, ideal for motor control.

AC/DC Voltage Control:

• AC Voltage Controllers: Both half-wave and full-wave controllers on lamp and motor loads.

• PWM (Pulse Width Modulation): Control circuits for motor and load regulation.

Motor Drive Experiments:

• Study of various types of motors such as:

  • PMDC (Permanent Magnet DC Motor): A 230V motor with load arrangement.

  • Single Phase Induction Motor: 1/2HP AC motor.

  • Three Phase Induction Motor: 1/2HP, used for more advanced experiments.

Firing Circuits and Control:

• Study of firing angle control for different types of rectifiers and converters.

• Includes experiments for ramp, comparator, and cycloconverter firing circuits.

Summary

This Power Electronics Module offers a comprehensive learning experience for understanding key concepts in power conversion, motor control, and circuit protection. The combination of theory, practical experimentation, and hands-on learning provides students with the opportunity to explore and understand:

• The operation of rectifiers (controlled and uncontrolled),

• Motor drive systems (induction motors, PMDC motors),

• Converters and inverters (including cycloconverters and PWM circuits),

• Firing circuits for controlling rectifiers and converters,

• And power supply management (including single-phase and three-phase systems).

This makes it an excellent tool for students and professionals working in the field of power electronics, as well as a solid foundation for more advanced studies or applications in electrical engineering.