DEPARTMENT OF ELECTRICAL POWER ENGINEERING COLLEGE OF ENGINEERING POWER ELECTRONICS 

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Topics Covered  DC To DC Converters  Introduction 

TOPICS COVERED: DC TO DC CONVERTER Buck (Step Down) Converter • Assumptions Made for Analysis of the Buck Converter • *Circuit Operation Switching Modes • 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 • Continuous Conduction Condition • The Diode and Capacitor Currents • The Capacitor Voltage Ripple Designing DCDC Converters • Converter Design Consideration PULSE WIDTH MODULATED INVERTERS Single Phase Inverter • Single Phase Half Bridge Inverter • Single Phase Full Bridge Inverter • Squarewave Inverter with RL Load • PulseWidth Modulation (PWM) Control Strategy • Amplitude & Harmonics Control • Sinusoidal Pulse Width Modulation (SPWM) • PWM Definitions & Considerations Bipolar Switching (Single Phase) Unipolar Switching (Single Phase) Three Phase Inverter • Switch State for Six Step Inverter • Six Step Inverter (continue)

DC TO DC CONVERTER Introduction
In this course, we are going to learn about buck and boost converters. Linear Regulator:
Switching Converter:
In general, DCDC converters have the following properties when operating in the steady state: 1. The inductor current is perioodic (repeating).
2. The average inductor voltage is zero.
3. The average capacitor current is zero.
4. The power supplied by the source is the same as the power delivered to load.
The figure below shows the current in different states: Before going further, there are several important parameters with the symbol to be known:
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