Ing Ind - Inf (Mag.)(ord. 270) - MI (471) BIOMEDICAL ENGINEERING - INGEGNERIA BIOMEDICA

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090918 - POWER ELECTRONICS

Ing Ind - Inf (Mag.)(ord. 270) - MI (473) AUTOMATION AND CONTROL ENGINEERING - INGEGNERIA DELL'AUTOMAZIONE

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090918 - POWER ELECTRONICS

Ing Ind - Inf (Mag.)(ord. 270) - MI (476) ELECTRONICS ENGINEERING - INGEGNERIA ELETTRONICA

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090918 - POWER ELECTRONICS

Obiettivi dell'insegnamento

This course provides the fundamentals of power electronics. Topics covered include: power semiconductor switches, drive and protection circuits; switching power converters; electric motor drive and 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 in the low-power range.

Risultati di apprendimento attesi

Dublin descriptor

Expected learning outcomes

1) knowledge and understanding

On completion of this course, students will be able to:

· comprehensively understand the principles and operation of modern power semiconductor devices, their limitations, and their driving and protection techniques;

· have a sound knowledge and understanding of the operation of pulse width modulated dc-dc converters used in low power applications;

· understand the dynamic performance of dc-dc converters and develop small-signal converter models;

· understand the basic working principles of brushed DC, brushless DC and stepper motors;

· understand electric motor drives as the synthesis of electric machines, power electronics and feedback control;

· understand and manage the thermal stress of active components in power electronic systems.

2) applying knowledge and understanding

Specific examples and case studies will be provided to make students able to:

· select the active/passive components of a power electronic circuit on the basis of specifications;

· apply appropriate techniques in the design of different types of power converters to meet given specifications;

· perform calculations to carry out approximate designs of low-power electric drives and their components;

· design controllers for power converters and electric drives;

· tackle with steady-state and dynamic thermal performance of power devices and ICs.

Argomenti trattati

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 MOSFETs. Lateral and vertical DMOS structures. On resistance. Switching characteristics. Gate charge characteristics. Absolute maximum ratings. Safe Operating Area (SOA).

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 drive and control

Introduction to motion 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.

Prerequisiti

Basic understanding of linear circuit theory (properties of electrical networks, fundamental network theorems), analog electronics (amplifiers, filters, frequency response, feedback principles, stability and frequency compensation), electron devices (mainly p-n junctions and MOSFET transistors). Some background in electrical machines is recommended as well.

Modalità di valutazione

Assessment is based on a final exam consisting of a 2-hour, closed-book written exam, typically including two numerical problems and an open-answer theoretical question. Students who pass the written exam may take an optional oral exam, consisting of a discussion on a topic picked at random from this list. The oral exam results in the adjustment (-1/30 to +2/30) of the written exam result, yielding the final grade.

Type of assessment

Description

Dublin descriptor

Written exam

· Solution of numerical problems involving analysis and design (e.g. analysis of switch-mode power converters, motor drives, power device drive&protection circuits, etc. Selection/design of active and passive devices for specific power applications).

· Open-answer theoretical/practical questions on any topic of the course.

1,2

1,2

Oral exam

· Theoretical/practical questions drawn from any topic of the course.

1,2

Bibliografia

N. Mohan, T. Undeland, W. Robbins, Power electronics: converters, applications, and design, 3rd Edition, Editore: John Wiley & Sons, Anno edizione: 2002, ISBN: 978-0-471-22693-2
R.W. Erickson, D. Maksimovic, Fundamentals of Power Electronics, 2nd Edition, Editore: Springer Science+Business Media, Anno edizione: 2001, ISBN: 0-7923-7270-0
B. Murari, F. Bertotti, G.A. Vignola, Smart power ICs, Editore: Springer, Anno edizione: 2002, ISBN: 978-3-540-43238-8
B.W. Williams, Power Electronics: Devices, Drivers, Applications, and Passive Components, Editore: e-book version, Anno edizione: 2006 http://personal.strath.ac.uk/barry.williams/book.htmCourse websitehttp://home.deib.polimi.it/ghioni/pel/ Note:

lecture slides, suggested readings, supplementary course materials and more info available on this website.

Forme didattiche

Tipo Forma Didattica

Ore di attività svolte in aula

(hh:mm)

Ore di studio autonome

(hh:mm)

Lezione

70:00

105:00

Esercitazione

30:00

45:00

Laboratorio Informatico

0:00

0:00

Laboratorio Sperimentale

0:00

0:00

Laboratorio Di Progetto

0:00

0:00

Totale

100:00

150:00

Informazioni in lingua inglese a supporto dell'internazionalizzazione

Insegnamento erogato in lingua
Inglese

Disponibilità di materiale didattico/slides in lingua inglese

Disponibilità di libri di testo/bibliografia in lingua inglese

Possibilità di sostenere l'esame in lingua inglese

Disponibilità di supporto didattico in lingua inglese