DEPARTMENT OF ELECTRICAL POWER ENGINEERING

COLLEGE OF ENGINEERING

POWER ELECTRONICS

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Topics Covered - Pulse Width Modulated Inverters - Single Phase Inverter - PWM Definitions & Considerations

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

 

 

Single Phase Inverter

PWM Definitions & Considerations

 

  • Frequency modulation ratio

  1. The Fourier Series of the PWM output voltage has a fundamental frequency which is the same as the reference signal.
  2. Harmonic frequencies exist at and around multiples of the switching frequency.
  3. The magnitudes of some harmonics are quite large, sometimes at high frequencies, a simple low-pass filter can be quite effective to remove them.
  • Amplitude modulation ratio

  • Switches
  1. The switches in the full bridge circuit must be able to carry current in either direction for PWM as in square wave operation.
  2. Feedback diodes across the switching devices are necessary.
  3. It is essential to allow for switching times in the control of the switches.

  • Reference voltages
  1. The sinusoidal reference voltage must be generated within the control circuit of the inverter or taken from an outside reference. It can sinusoidal or non-sinusoidal.

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