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Engr. Affifa Adeeb The Islamia University of Bahawalpur University College of Engineering & Technology EEN-324 EEN-324 Power Electronics Power Electronics Inverters Inverters Chp#10 Chp#10 1

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Introduction. Conversion of available DC source into AC of variable frequency is accomplished by force commutated inverters. The frequency of AC at output can be varied by controlling the conduction period of thyristors. - PowerPoint PPT Presentation

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Page 1: Introduction

Engr. Affifa Adeeb

The Islamia University of BahawalpurUniversity College of Engineering &

Technology

EEN-324EEN-324Power ElectronicsPower Electronics

InvertersInvertersChp#10Chp#10

1

Page 2: Introduction

INTRODUCTION Conversion of available DC source into AC of variable

frequency is accomplished by force commutated inverters.

The frequency of AC at output can be varied by controlling the conduction period of thyristors.

Output voltage of inverter has periodic waveform that is not sinusoidal but can be made to closely approximate this desired waveform.

Inverters are used in industrial applications, including speed control of induction and synchronous motor, aircraft power supplies, uninterruptible power supplies (UPS), and high-voltage DC transmision. 2

Page 3: Introduction

3

Half-Bridge Inverter

Page 4: Introduction

4

Square-wave output

Step-wave output

Page 5: Introduction

VOLTAGE SOURCE INVERTER

(VSI)

5

Page 6: Introduction

6

Half-Bridge VSI

Page 7: Introduction

7

Example 10.1

Page 8: Introduction

8

Full-Bridge VSI

State S1 S2 S3 S4 Output Voltage1 On Off Off On +E2 Off On On Off -E3 On Off Off On +E4 Off On On Off -E

Page 9: Introduction

9

Page 10: Introduction

10

With Inductive RL load Square-Wave output

Page 11: Introduction

11

Step-Wave output

Page 12: Introduction

12

Inverter Voltage Control Techniques

1- Control of DC input voltage supplied to the inverter

2- Control of AC output voltage of the inverter

3- Control of the voltage within the inverter

Page 13: Introduction

PULSE-WIDTH MODULATION

13

Page 14: Introduction

(A) SINGLE PULSE-WIDTH MODULATION

14

Page 15: Introduction

15

(B) MULTIPLE PULSE-WIDTH MODULATION

(a) m= 2(b) m= 3

Variable duty cycle withm= 5

Page 16: Introduction

16

(C) SINUSOIDAL PULSE-WIDTH MODULATION

Page 17: Introduction

17

Page 18: Introduction

PWM INVERTERS

18

Single-phase Full-Bridge Inverters


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