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Course Description
This course provides the fundamentals of power electronics. Topics covered include: power semiconductor switches, drive and protection circuits; switching power converters; motor control; thermal design. The primary goal of the course is to provide students with the basic skills and knowledge required to analyze and design practical power electronic systems.
Outline of Topics
1) Power semiconductor switches, drive and protection circuits
Introduction to power electronics. Energy efficiency: the role of power electronics. Elementary switching circuits. Overview of power semiconductor switches. Conduction and switching losses.
Power diodes: p-i-n structures. Reverse blocking. Forward conduction characteristics. Switching characteristics.
Power MOSFETs. Lateral and vertical DMOS structures. On resistance. Switching characteristics. Gate charge characteristics. Avalanche and dv/dt limitations. Safe Operating Area (SOA).
Insulated Gate Bipolar Transistors (IGBT). Basic structure. Physics of device operation. Latchup. Switching characteristics.
Gate drive circuits for low-side and high-side switches. Charge pump and bootstrap techniques. Electrically isolated drive circuits. Overvoltage, overcurrent and overtemperature protection circuits.
2) Switch-mode DC-DC converters
Overview of Distributed Power Architectures (DPA).
DC-DC converters: basic non-isolated topologies (Buck, Boost, Buck-Boost). Pulse Width Modulation (PWM). Steady state converter analysis. Continuous and discontinuous conduction modes (CCM and DCM).
Converter dynamics and control. Circuit averaging and averaged switch modeling. Converter transfer functions. Controller design: voltage and current mode control.
Step-down switching regulator design example.
Switch-mode power supplies: the need for isolation. Review of magnetics. Isolated DC-DC converters. Flyback converter: CCM and DCM operation. Steady state analysis.
Flyback regulator design example.
3) Motor control
Introduction to motor control.
Review of DC motor operating principles. Dynamic model. Four-quadrant operation. Full-bridge converters. Dynamic and regenerative braking. Closed-loop control of DC motors. Design of a DC motor drive.
Stepper motors: basic operating principles. Permanent magnet, variable reluctance and hybrid stepper motors. Stepper motor drives.
Brushless DC motors: basic operating principles. Trapezoidal drive. Overview of sinusoidal drives. Speed control. Sensorless control.
4) Thermal management
Thermal considerations for power semiconductors. Heat transfer by conduction, convection and radiation. Packaging of power devices. Heat sinks. Steady state thermal calculations. Transient operation: thermal impedance. Transient thermal calculations.
Learning Outcomes
By the end of this course, students will be able to: a) understand the behavior of power semiconductors at a physical level; b) design a power converter to meet given specifications; c) evaluate alternative power converter options; b) design a motor drive to meet given specifications; d) design controllers for power converters and motor drives.
Prerequisites
There are no official prerequisites for this course. However, 095143-Analog circuit design is recommended. Some background in electrical machines is recommended as well.
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Inglese