Power Factor Correction (PFC) Circuit – II | Boost PFC Design | Bridgeless PFC | Totem Pole PFC | Electric Vehicles | Lecture 12

Power Factor Correction (PFC) plays a crucial role in modern electric vehicle battery chargers by ensuring high power factor, reduced harmonic distortion, and efficient utilization of electrical energy from the utility grid. In this lecture, we continue the design and analysis of the Boost Power Factor Correction (Boost PFC) converter by deriving the expressions for inductor and output capacitor sizing. The lecture explains why the output capacitor in a Boost PFC is designed based on the line frequency rather than the switching frequency and discusses the impact of second-line harmonics on capacitor selection.

The lecture further investigates the operation of the Boost PFC converter in Discontinuous Conduction Mode (DCM). Detailed derivations are presented to explain the inductor current waveform, peak current, average input current, and the conditions required to obtain a sinusoidal input current for improved power factor correction.

Finally, advanced PFC topologies including the Bridgeless PFC and Totem Pole PFC converters are introduced. Their construction, operating principle, current paths during positive and negative half cycles, along with their respective advantages and limitations, are discussed. These converter topologies are widely adopted in high-efficiency EV chargers due to their reduced conduction losses and improved overall performance.

Topics Covered

Boost PFC Inductor Design
Output Capacitor Design for Boost PFC
Effect of Second-Line Harmonics
Advantages and Limitations of Boost PFC
Boost PFC in Discontinuous Conduction Mode (DCM)
Inductor Peak and Average Current Analysis
Sinusoidal Input Current Generation
Bridgeless PFC Converter Construction and Operation
Advantages and Disadvantages of Bridgeless PFC
Totem Pole PFC Converter Construction and Operation
Advantages and Disadvantages of Totem Pole PFC

Who Should Watch?

B.Tech. and M.Tech. students
Power Electronics learners
Electric Vehicle enthusiasts
GATE and ESE aspirants
Researchers working on EV charging systems
Engineers designing high-efficiency AC–DC converters and battery chargers

Recommended References

D. W. Hart, Power Electronics, McGraw-Hill, 2011.
P. S. Bimbhra, Power Electronics, 5th Edition, Khanna Publishers, 2012.
Q. Li, M. A. E. Andersen, and O. C. Thomsen, Research on Power Factor Correction Boost Inductor Design Optimization: Efficiency vs. Power Density, IEEE ECCE Asia, 2011.

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