Wireless Power Transfer (WPT) for Electric Vehicles | IPT, CPT & HPT | Static, Dynamic & Quasi-Static Charging | Lecture 20

Wireless Power Transfer (WPT) is an emerging EV charging technology that enables the transfer of electrical energy without physical cables or connectors, offering greater convenience, safety, and automation. In this lecture, we begin by introducing the fundamentals of Wireless Power Transfer, its classification into near-field and far-field techniques, and explain why near-field WPT is the preferred choice for electric vehicle charging applications. The lecture also compares the capabilities of Conventional Transformers and Solid-State Transformers (SSTs), highlighting the advantages of SSTs such as high power density, voltage regulation, power factor correction, bidirectional power flow, and smart grid integration.

The lecture then discusses the advantages and challenges of Wireless Power Transfer, including convenience, galvanic isolation, automatic charging, weather immunity, dynamic charging capability, misalignment tolerance, communication requirements, and foreign object detection. Different wireless charging technologies are introduced, namely Inductive Power Transfer (IPT), Capacitive Power Transfer (CPT), and Hybrid Power Transfer (HPT), along with their operating principles and applications. Special emphasis is given to IPT, the most widely adopted technology for EV charging due to its high power transfer capability at approximately 85 kHz. Finally, the lecture explains the concepts of Static, Quasi-Static, and Dynamic (In-Motion) wireless charging used in modern electric vehicle charging infrastructure.

Topics Covered

Conventional Transformer vs Solid-State Transformer (SST)
Advantages of Solid-State Transformers
Introduction to Wireless Power Transfer (WPT)
Near-Field and Far-Field WPT
Advantages and Challenges of WPT
Inductive Power Transfer (IPT)
Capacitive Power Transfer (CPT)
Hybrid Power Transfer (HPT)
Static Wireless Charging
Quasi-Static Wireless Charging
Dynamic (In-Motion) Wireless Charging
Applications of Wireless Charging in Electric Vehicles

Who Should Watch?

B.Tech. and M.Tech. students
Power Electronics learners
Electric Vehicle enthusiasts
GATE and ESE aspirants
Researchers working on EV charging technologies and wireless power systems
Engineers designing EV charging infrastructure and smart grid solutions

Recommended References

C. C. Mi, G. Buja, S. Y. Choi, and C. T. Rim, Modern Advances in Wireless Power Transfer Systems for Roadway Powered Electric Vehicles, IEEE Transactions on Industrial Electronics.
C. T. Rim and C. Mi, Wireless Power Transfer for Electric Vehicles and Mobile Devices, Wiley.
N. Mohan, T. M. Undeland, and W. P. Robbins, Power Electronics: Converters, Applications, and Design, 3rd Edition, Wiley.

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