sinewave inverter using igbt manual

8/11/2019 Sinewave Inverter Using IGBT MANUAL

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Table of contents

1. Introduction

2. Technical Specif ications

3. Front Panel Controls

4. Patch Connection Details

5. Operating Instructions

6. Circuit Description

Single phase IGBT Based PWM INVERTER

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INTRODUCTION

In this medthod a fixed dc input voltage is given to the inverter and a controlled ac outputvoltage is obtained by adjusting the on and off periods of the inverter components .

This is the most popular method of controlling the output voltage and this method is termedas pulse width modulation (PWM) control.

PWM techniques are characterised by constant amplitude pulses. The width of these pulsesis however modulated to obtain inverter output voltage control and to reduce its harmoniccontent. Different PWM techniques are as, Single pulse modulation, Multipulse modulationand sinusoidal pulse modulation.

In mutiple pulse modulation several equidistant pulses per half cycle are used. For simplicity the effect of using two symmetrically spaced pulses per half cycle, But their amplitudees are the same. In this this method of modulation several pulses per half cycleare used in the case of multiple pulse modulation. In MPM the width is equal for all the

puilses. But in sin M, the pulse width is a sinusoidal function of the angular position of the pulse in a cycle.

For realing sin M a high frequency triangular carrier wave is compared with a sinusoidalreference wave of the desired frequency. The carrier and reference waves are mixed in acomparator. When sinusoidal wave has magnitude higher than the triangular wave thecomparator output is high, otherwise it is low. The comparator output is processed in atrigger pulse generator in such a amanner that the output voltage wave of the inverter has a

pulse width in agreement with the comparator output pulse width.



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TECHNICAL SPECIFICATIONS

Single phase IGBT based PWM INVERTER

INPUT : 12V DC

OUTPUT : 14 VAC approx:

CURRENT : 500mA

Waveform : Sine

Reference Triangle FREQUENECY :50KHZ Varriable by 10%

Reference Sine FREQUENECY :50 HZ Varriable by 10%.

Output Fil ter Inductance Value : 4mH, and 1mH, 2A

Output Fil ter Capacitance Value : 1mfd, and 0.47mfd, 250v

IGBT :FGA25N120

Build in input voltage source ` : from 12VDC

Bulid in Output Load: 100 Ohms 5w Fusable Resistor



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Front panel controls

Power : Rocker switch selects instrument switch on.

INPUT Power Supply VDD : 12VDC

Reference Voltage: :6vdc

Reference Sine : 50Hz Frequency and Amplitude varriable

Reference Triangle Wave : 50KHZ Frequency Varriable

Square wave output terminal from reference sine wave.

Triangle wave modulated with reference square wave output terminal.

IGBT Gate drive pulse modulated with sine wave Terminals to drive H- Bridge Typeinverter Circuit.

Output Terminals from H-Bridge to Fil ter sections.

Output Filter Section input and output Terminals

Output Load Resistive, 100E, 5W Fusable.



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1. Connect the IGBT Gate Drive Terminals G1 to G1 of H-Bridge, G2 to G2, G3 to G3 and G4 to G4 of H Bride as per dotted patch connections.

2. Connect the output Terminals of H- Bridge to input terminals of Filter section as per the patch connections shown

3.Observe the output of Reference Sinewave in CRO and note down the frequency of it and draw the wave form in graph .

4.Observe the output of Reference Triangle wave in CRO and note down the frequency of it and draw the wave form in graph .

5.Observe the output of Reference Square wave obtain from sine ref wave in CRO and note down the frequency of it and draw the wave form in graph .

6..Observe the Modulated and summed triangle wave with square wave in CRO and draw the wave form in graph .

7. Measure the VDD dc voltage at H-Bridge.

8. Observe the output Modulated, unfiltered wave form at the input terminal of filter section.

9.Observe the output wave form at output terminals of filter section, ie Sinewave in CRO and note down the frequency of it and draw the wave form in graph .

10. Measure the output voltage at the output of filter section with the AC VOLTMETER of 20V Range in Mutimeter and note down it.

11. Now Connect the output of inverter to Load Section through a AC Ammeter and notedown the current.

12. For the higher output voltages, this inverter output may be connected toStep up Transformer of

12VAC to 220v ac. But it is optional only. Not necessary for lab observation.

Operating instructions



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M a n u al f o r

( Sr. No:............................)

SINGLE PHASESINEWAVE IGBT BASED PWM INVERTER

TRAINER



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sinewave inverter using igbt manual

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