21`

DEPARTMENT OF ELECTRICAL POWER ENGINEERING

COLLEGE OF ENGINEERING

POWER ELECTRONICS

| Home | Topics | Summary of Topics | Examples | Test Your Understanding | Survey |
Topics Covered - Pulse Width Modulated Inverters - Three Phase Inverters - Switch State for Six Step Inverter

TOPICS COVERED:

DC TO DC CONVERTER

•  Introduction

Buck (Step Down) Converter

•  Assumptions Made for Analysis of the Buck Converter

•  *Circuit Operation Switching Modes

•  Output Voltage Average

•  The Inductor Current Ripple

•  The Load and the Capacitor Current

•  Continuous Conduction Condition

•  The Capacitor Voltage Ripple

Boost (Step Up) Converter

•  Assumptions Made for Analysis of the Boost Converter

•  *Circuit Operation Switching Modes

•  Output Voltage Average

•  The Inductor Current Ripple

•  The Inductor Current

•  Continuous Conduction Condition

•  The Diode and Capacitor Currents

•  The Capacitor Voltage Ripple

Designing DC-DC Converters

•  Converter Design Consideration

PULSE WIDTH MODULATED INVERTERS

•  Introduction

•  Inverter Types

•  Basic Inverter

•  Performance Parameters

•  Fourier Series

•  Total Harmonic Distortion

Single Phase Inverter

•  Single Phase Half Bridge Inverter

•  Single Phase Full Bridge Inverter

•  Square-wave Inverter

•  Square-wave Inverter with RL Load

•  Pulse-Width Modulation (PWM) Control Strategy

•  Amplitude & Harmonics Control

•  Sinusoidal Pulse Width Modulation (SPWM)

•  PWM Definitions & Considerations

Bipolar Switching (Single Phase)

•  PWM Outputs

•  PWM Harmonics

Unipolar Switching (Single Phase)

•  PWM Outputs

•  PWM Harmonics

Three Phase Inverter

•  Introduction

•  Switch State for Six Step Inverter

•  Six Step Inverter (continue)

•  Three Phase SPWM

 

 

 

Three Phase Inverter

Switch State for Six State Inverter

First, you need to know ohm's law.

Example State 1: S1, S2 S6 on (mouse over the image to see the circuit without line)

Assuming E is equal to dc input.

Switch State for Six Step Inverter

Switch status

... ON.... OFF...

State No

Switch States (upper)

Van

Vbn

Vcn

Vab

Vbc

Vca

S1 S2 S6

S4 S5 S3

1

100

2E/3

-E/3

-E/3

E

0

-E

S2 S3 S1

S5 S6 S4

2

110

E/3

E/3

-2E/3

0

E

-E

S3 S4 S2

S6 S1 S5

3

010

-E/3

2E/3

-E/3

-E

E

0

S4 S5 S3

S1 S2 S6

4

011

-2E/3

E/3

E/3

-E

0

E

S5 S6 S4

S2 S3 S1

5

001

-E/3

-E/3

2E/3

0

-E

E

S6 S1 S5

S3 S4 S2

6

101

E/3

-2E/3

E/3

E

-E

0

Mouse over to the state number to see the circuit and how the voltage is obtained.

.

.

Click to go to PREVIOUS page

Click to go to NEXT page

Go To TOP page

.

.

.

.

| Home | Topics | Summary of Topics | Examples | Test Your Understanding | Survey |