DEPARTMENT OF ELECTRICAL POWER ENGINEERING COLLEGE OF ENGINEERING POWER ELECTRONICS 

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Topics Covered  DC To DC Converters  Buck (Step Down) Converter  Important Parameters 

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)

Buck (Step Down) Converter Output Voltage Average
The Load and the Capacitor Current
Continuous Conduction Condition The boundary or critical average inductor current (minimum inductor current) is zero for continuous conduction condition. The minimum continuous current is: Note: In practice, L is designed to be 125% greater or 10 times larger than the calculated minimum inductor value. (for allowing continuous current)
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