Electrical Final Year 2014 Batch

PRACTICAL SETUP

OF

POWER ELECTRONICS LAB

CONTENTS

1) SCR

2) TRAIC

3) GTO

4) BJT

5) IGBT

6) MOSFET

7) R-FIRING CKT

8) RC-FIRING CKT

9) UJT-FIRING CKT

SILICON CONTROLLED RECTIFIER (SCR)

7000 v5000 Amp

V-I Characteristics of SCR

APPLICATIONS OF SCR :-

• Speed control for motors• Battery-charging regulator• Temperature controller circuit• Emergency-lighting system• Temperature control for electric hot plate• Dimmer switch for domestic lighting• Dimmer control for stage lighting.

Triac

1200 V1000 Amp

SYMBOL & LAYER DIAGRAM

V-I CHRACTERISTICS OF TRAIC

Applications of the TRIAC

The TRIAC as a bidirectional thyristor has various applications. Some of the popular applications of the

TRIAC are as follows:

(i) In speed control of single-phase ac series or universal motors.

(ii) In food mixers and portable drills.

(iii) In lamp dimming and heating control.

(iv) In zero-voltage switched ac relay.

GATE TURN OFF THYRISTOR

(GTO)5000 v3000 Amp

CIRCUIT SYMBOL AND STRUCTURE OF GTO

V-I CHRATERISTICS OF GTO

GTO Applications

• Counters• Pulse generators• Oscillators• Voltage regulators

Bipolar Junction Transistor(BJT)

1400 v400 Amp

LAYER DIAGRAM

V-I CHARACTERISTIC OF BJT

Insulated Gate Bipolar Transistor (IGBT) 1200 v

500 Amp

Vertical cross section of an IGBT

V-I characteristics of an IGBT

APPLICATIONS:

The IGBT is mostly used in high-speed switching devices. They have switching speeds greater than those of bipolar power transistors.

Robot welding machine.

Uninterruptible Power Supply.

Motor control.

Metal Oxide Semiconductor Field Effect Transistor (MOSFET )

1000 v50 Amp

Schematic construction of a MOSFET

V-I CHARATERISTIC OF MOSFET

Applications of Power Devices

R-FIRING CIRCUIT

R-C FIRING CIRCUIT

UJT TRIGRING CIRCUIT

UJT-Firing Circuit&

Electronic Fan Regulator

THE ENDTHANK YOU