Description

AL-E208A SCR SINGLE AND THREE PHASE HALF-FULL CONTROLLED BRIDGE CONVERTER TRAINER

DETAILED TECHNICAL SPECIFICATION

Product Name

AL-E208A – SCR Single and Three Phase Half/Full Controlled Bridge Converter Trainer

1. Overview

The AL-E208B Trainer is a comprehensive educational system designed to study the principles and practical operation of Silicon Controlled Rectifier (SCR) based controlled rectifiers. The trainer enables students to perform experiments on Single Phase and Three Phase Half-Controlled and Fully Controlled Bridge Converters with adjustable firing angle control.

The system demonstrates phase-controlled AC-to-DC power conversion using SCR firing circuits and facilitates performance analysis with resistive and inductive loads. The trainer is suitable for undergraduate, postgraduate, diploma, and vocational laboratories in Electrical and Electronics Engineering.

2. Learning Objectives

The trainer enables students to understand and perform experiments on:

·       Characteristics of Silicon Controlled Rectifier (SCR)

·       SCR triggering principles

·       Gate pulse generation techniques

·       Phase angle control

·       Single Phase Half-Controlled Bridge Converter

·       Single Phase Fully Controlled Bridge Converter

·       Three Phase Half-Controlled Bridge Converter

·       Three Phase Fully Controlled Bridge Converter

·       Output voltage control by varying firing angle

·       Effect of firing angle on converter performance

·       Operation with Resistive (R) Load

·       Operation with Resistive-Inductive (RL) Load

·       Waveform analysis

·       Average output voltage measurement

·       Ripple analysis

·       Converter efficiency study

3. Electrical Specifications

Input Supply

·       Input Voltage : 415 V AC ±10%

·       Frequency : 50 Hz ±5%

·       Three Phase Supply

·       Mains Protection through MCB

Auxiliary Supplies

·       +15 V DC Regulated Supply

·       Current Rating : Minimum 150 mA

Isolated AC Supply

·       Alternative Output : 24 V AC

·       Current Rating : 2Amp minimum

·       Fully isolated from mains

4. Power Semiconductor Devices

Silicon Controlled Rectifier

·       Type : TYN604 or Equivalent

·       Peak Repetitive Voltage : 400–600 V

·       Average Forward Current : 4 A

·       Gate Trigger Control

·       Heat sink mounted

Rectifier Diodes

·       1N5408

·       BA159

·       High surge capability

5. Gate Firing Circuit

The trainer shall include an isolated SCR firing circuit capable of providing synchronized gate pulses.

Features include:

·       Adjustable firing angle

·       Phase synchronized triggering

·       Independent gate triggering

·       Individual R, Y and B phase firing

·       Stable triggering over complete firing range

·       Low noise pulse generation

·       Isolation between control and power circuit

6. Converter Configurations

The trainer shall provide dedicated experimental circuits for:

Single Phase

·       Half Controlled Bridge Converter

·       Fully Controlled Bridge Converter

Three Phase

·       Half Controlled Bridge Converter

·       Fully Controlled Bridge Converter

Each converter shall have separate terminals for experimentation.

7. Load Section

Resistive Load

·       High power wire wound resistor

·       Lamp load

·       Rated Power : 20 W minimum

Inductive Load

·       High quality iron core inductor

·       Suitable for converter experiments

·       Protected winding

8. Measurement Facilities

The trainer shall provide clearly marked terminals for measuring:

·       Input Voltage

·       Output Voltage

·       Output Current

·       Gate Pulse

·       SCR Anode Voltage

·       Cathode Voltage

·       Trigger Pulse

·       Reference Ground

Compatible with:

·       Digital Multimeter

·       CRO

·       Digital Storage Oscilloscope

9. Protection Features

The trainer shall include:

·       MCB protection

·       Short circuit protection

·       Over current protection

·       Isolated power supply

·       Fuse protection

·       Shock-proof cabinet

·       Heat sink protection

·       Reverse polarity protection (control section)

10. Front Panel

The front panel shall consist of:

·       Industrial grade FRP/PCB panel

·       Silk screen printed circuit diagram

·       Component identification

·       Functional block diagram

·       Clearly numbered terminals

·       Colour coded sockets

·       Safety symbols

11. Connection System

·       4 mm safety sockets

·       Color coded terminals

·       Stackable patch cords

·       Gold plated contacts (optional)

·       Easy plug-in arrangement

12. Mechanical Construction

·       Powder coated CRCA steel cabinet

·       Bench top model

·       Corrosion resistant finish

·       Ventilated enclosure

·       Rubber feet

·       Compact and rugged construction

Approximate Dimensions

·       450 mm × 300 mm × 150 mm

Weight

·       Approximately 8–12 kg

13. Standard Accessories

The trainer shall be supplied with:

·       Patch Cord Set

·       Power Cord

·       Instruction Manual

·       Experiment Manual

·       Circuit Diagram

·       User Guide

14. Optional Accessories

·       Digital Storage Oscilloscope

·       CRO

·       Digital Multimeter

·       Isolation Transformer

·       Variac

15. List of Experiments

The equipment shall support the following experiments:

1.     Study of SCR Characteristics

2.     Study of SCR Gate Triggering

3.     Single Phase Half Controlled Bridge Converter

4.     Single Phase Fully Controlled Bridge Converter

5.     Three Phase Half Controlled Bridge Converter

6.     Three Phase Fully Controlled Bridge Converter

7.     Output Voltage versus Firing Angle

8.     Performance with Resistive Load

9.     Performance with RL Load

10.  Observation of Gate Pulses

11.  Measurement of Average Output Voltage

12.  Measurement of Ripple Voltage

13.  Input and Output Waveform Analysis

14.  Performance Comparison of Half and Full Controlled Converters

16. Educational Applications

Suitable for:

·       Engineering Colleges

·       Polytechnic Institutes

·       Universities

·       ITI Laboratories

·       Skill Development Centres

·       Industrial Training Institutes

·       Research Laboratories

·       Power Electronics Laboratories

17. Standards

The trainer shall be designed in accordance with applicable laboratory safety practices and shall comply, wherever applicable, with:

·       IEC Safety Guidelines

·       IS Electrical Safety Standards

·       CE compliant components (where applicable)

·       RoHS compliant electronic components (where applicable)

18. Warranty

·       Minimum 12 Months Comprehensive Warranty

·       Technical Support

·       Service Manual

·       Spare Parts Availability

·       Lifetime Technical Assistance

Salient Features

·       Single & Three Phase Operation

·       Half Controlled and Fully Controlled Bridge Converters

·       Adjustable SCR Firing Angle

·       Separate Trigger Circuits

·       Isolated Power Supply

·       Built-in Protection Circuitry

·       High Quality Industrial Components

·       Colour Coded Safety Sockets

·       Rugged Powder Coated Metal Cabinet

·       Industrial Grade PCB

·       Comprehensive Experiment Manual

·       Ideal for Power Electronics Laboratory

Technical Details