Charging Infrastructure & DC–DC Converters – II | Buck–Boost, Bidirectional Converter & Flyback Converter | Lecture 05

In this lecture, we continue our exploration of DC–DC converters used in electric vehicle charging systems and power electronic applications. The session begins with a detailed analysis of the Buck–Boost Converter, including its operating principles, voltage conversion ratio, inductor current waveforms, minimum inductance design, and output capacitor design. The lecture then introduces the Bidirectional Buck–Boost Converter, explaining its operation in both charging (Buck mode) and discharging (Boost mode) for EV battery systems with practical duty-cycle calculations. Finally, the lecture compares Non-Isolated and Isolated DC–DC Converters and introduces the Flyback Converter, covering transformer dot convention and steady-state operation.

Topics Covered:

Buck–Boost Converter: Principle of Operation
Continuous Conduction Mode (CCM) Analysis
Voltage Conversion Ratio Derivation
Inductor Current Waveforms
Minimum Inductor Design
Output Capacitor Design
Bidirectional Buck–Boost Converter
Buck Mode & Boost Mode Operation
Duty Ratio Calculation with Numerical Examples
Non-Isolated vs. Isolated DC–DC Converters
Advantages and Limitations of Each Topology
Introduction to Flyback Converter
Transformer Dot Convention
Flyback Converter Operating Principle

Who Should Watch?

B.Tech./M.Tech. students
Power Electronics learners
Electric Vehicle enthusiasts
GATE aspirants
Researchers and practicing engineers
Professionals working on EV charging systems and battery management

Recommended Reference:
R. W. Erickson and D. Maksimović, Fundamentals of Power Electronics, 2nd Edition, Springer.

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