The charging system
of an electric vehicle (EV) is a crucial part of the
overall EV system. This course is designed to develop
the foundation for pursuing future research on the EV
charging system. The primary focus of this
course is the analysis, design, modeling, and control
of standard power electronic converters for the EV
charger.
Short Summary:
The electrical
subsystems of an Electric Vehicle (EV) are 1)
battery charger and 2) motor drives. This course
will focus on understanding different power
electronic converters for EV chargers. The EV
chargers can be classified in several ways based on
1) the power levels, 2) charger location- onboard or
off-board, 3) isolated or non-isolated, 4)
unidirectional or bidirectional, and 5) conductive
or wireless-inductive. Generally, these chargers
have two power conversion stages- 1) power factor
corrected rectifier(PFC) for converting
line-frequency AC to DC, and 2) DC-DC power
conversion to charge the battery while providing
galvanic isolation. The second part could either be
conductive or wireless-inductive.
The first half of this course is designed to
understand the individual power conversion stages of
a conventional conductive charging system. A
boost-derived PFC circuit will be studied to provide
a clear understanding of the PFC stage. An
isolated H-bridge converter with phase-shift control
will be studied for the DC-DC power conversion
stage.
The remaining half of this course will explore
inductive wireless power transfer (WPT) technology
for EV charging. From the Power Engineering side,
WPT is relatively new, and only a limited course
reference material is available till date.
Therefore, all the basics of this technology will be
taught first. This includes basics of resonant
converter, WPT working principle, dual-side
compensation, circuit design, modeling, and
closed-loop control.
Syllabus:
Overview of transportation
electrification and EVs - EV powertrain.
Conventional resonant converters - series, parallel,
and LLC - Overview of WPT - Operating principle:
coupled inductor model/ transformer model -
Compensation - Circuit analysis (gain, input
impedance, efficiency, etc.) - design (only SS and
PS), WPT Coils (circular, rectangular, DD) Plant
transfer function and control.
Conventional conductive charging system - Power
conversion stages - Basics of PFC, different PFC
converters - Boost & buck-boost PFC circuit:
operation, modeling, and control Isolated
unidirectional DC-DC converter - operation, Phase
shifted full-bridge isolated buck converter - Basic
Analysis, modeling, and control.
References:
Conductive charging:
1) "Fundamentals of
Power Electronics", Robert W. Erickson and Dragan
Maksimovic, Springer, Second Edition 2005.
2) "Power Electronics: Converters, Applications and
Design", Mohan,
Undeland and Robbins, Wiley,
Third Edition 2007