DEPARTMENT OF ELECTRICAL POWER ENGINEERING

COLLEGE OF ENGINEERING

POWER ELECTRONICS

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Summary - DC-DC Converters

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

• Performance Parameters

Single Phase Inverter

• Single Phase Half Bridge Inverter

• Single Phase Full Bridge Inverter

• Methods of Controlling Single Phase Inverter

• Pulse-Width Modulation (PWM) Control Strategy

•Sinusoidal Pulse Width Modulation (SPWM)

Three Phase Inverter

• Line-to-line Voltage Waveform

• Line-to-neutral Voltages

• Output Currents

• Voltage Control of Three Phase Inverters

DC to DC Converters

  1. DC-DC converters are power electronics circuits that convert a dc voltage to a different dc voltage level.
  2. A switched-mode dc-dc converter is more efficient than a linear converter due to low losses in the elctronic switch.
  3. A buck converter steps down dc output voltage.
  4. A boost converter steps up dc output voltage.
  5. It is very important to understand the two switch mode of the converter.

(See the Circuit Modes for buck converter)

(See the Circuit Modes for boost converter)

Summarized formula:

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