Double Degree in Electronic Systems Engineering in Communications and Management of ICTS La Salle Campus Barcelona

Double Degree in Electronic Systems Engineering in Communications and in Engineering in the Management of ICTs

La Salle Campus Barcelona offers 5 double degrees in the ICT Engineering field. With the double degrees, you can finish the university studies in 5 academic years with two official degree qualifications.

Power Electronics

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Description
This course introduces the components and topologies commonly used in the implementation of the different types of switched-mode power converters. The first part of the course is aimed at developing the analysis techniques required to obtain the relevant converter parameters in steady state conditions (voltages, currents and efficiency) and at developing a first converter equivalent model. Both continuous and discontinuous modes of operation are considered. The basic DC-DC converter topologies (buck, boost and buck-boost), as well as other converter types (SEPIC, Cuk) are covered. Following lectures are devoted to the study of the power semiconductors (diode, MOSFET, IGBT) and its realization in switched-mode power converters. Equivalent circuit models developed previously are refined to include the efficiency losses derived from component non-idealities (conduction and switching losses). A basic introduction to the transformer for switching applications is given and a number of isolated converter circuit topologies are explored. The course addresses as well the converter control in closed-loop mode. Firstly, the converter AC model is derived and solved to find the important transfer functions of the converter and its controller. The closed-loop system is analyzed, and the controller designed to meet the design goals (line and load regulation, transient response, etc.). A whole chapter is dedicated to AC-DC converters or rectifiers, with special emphasis on low harmonic content rectifiers. The last set of lectures is devoted to motors and motor drivers. A brief description of the most common motor types is followed by a more detailed analysis of the associated motor drivers. LTspice simulator is extensively used along the course to illustrate the concepts introduced in the theoretical sections and to analyze the performance of the different circuits and devices. A basic understanding of electronics components and semiconductor devices, electrical circuit analysis and control systems are assumed prerequisites for this course.
Type Subject
Optativa
Semester
First
Credits
4.00

Titular Professors

Josep Maria Rio Doval
Professor
Previous Knowledge

Electronic components and semiconductor devices, basic electronics, analysis of circuits and fundamentals of control systems.

Objectives

After completing successfully this course, the student will acquire the knowledge and the skills needed to:
• Understand what a switched-mode converter is, its operating principles and the different topologies used to implement them.
• Use different analysis techniques to derive an averaged equivalent circuit model and solve for the relevant converter parameters in steady-state.
• Use transformers to implement isolated DC-DC converters.
• Implement the converter switches using power semiconductors.
• Determine the critical parameters and ratings of both passive and active components used in converter circuits and select commercial devices fulfilling them.
• Design low and medium complexity DC-DC converters using commercial controllers.
• Evaluate the efficiency of the converter circuits, and identify and analyze options to improve it.
• Develop simple thermal models for the converter components.
• Develop an AC model of the converter and use it to analyze and design the converter controller.
• Simulate switched-mode converters in open and closed-loop mode using their equivalent DC and AC models.
• Understand the different types of electric motors and the circuits used to drive them.

Contents

1. INTRODUCTION TO POWER ELECTRONICS
1.1 Introduction

2. DC-DC CONVERTERS
2.1 Introduction and objectives
2.2 Analysis techniques
2.3 Volts-second and charge balance
2.4 Basic DC-DC converter topologies: buck, boost and buck-boost
2.5 Output voltage ripple
2.6 Efficiency
2.7 DC model of the converter
2.8 Other topologies: ?uk, SEPIC
2.9 Transient mode

3. ELECTRONIC SWITCHES
3.1 Switch implementation
3.2 Diode
3.3 MOSFET
3.4 Implementation of switches using semiconductor devices
3.5 Bipolar transistor
3.6 IGBT
3.7 SOA
3.8 Effect of the switch on efficiency
3.9 Thermal analysis

4. DC-DC ISOLATED CONVERTERS
4.1 Introduction
4.2 Transformers for switching applications
4.3 Asymmetric isolated converters
4.4 Symmetric isolated converters

5. MODEL AC AND DESIGN OF THE CONTROL SYSTEM
5.1 Converter control in closed loop
5.2 Converter averaged and AC models
5.3 Transfer functions
5.4 System design

6. AC-DC CONVERTERS
6.1 Basic concepts of rectifiers
6.2 Uncontrolled rectifiers
6.3 Rectifiers with low harmonic content
6.4 Polyphase rectifiers
6.5 Thyristors and Triacs
6.6 Controlled rectifiers

7. MOTOR DRIVERS
7.1 Introduction
7.2 Brushed DC motors
7.3 Step Motors
7.4 Brushless DC Motors
7.5 AC motors

Methodology

The subject is taught by lectures where the theoretical contents are combined with the demonstration of concepts through the use of simulation programs and other visual tools (models, animations, etc.).

The consolidation of the acquired concepts is achieved through the realization of individual exercises that allow to develop and to extend the theoretical concepts and to use simulation tools for its application and validation
.
A practice, in the form of a small project that covers all the phases of design and that the student develops throughout the course, allows him to apply and consolidate additionally the knowledge acquired.

All the teaching material (presentations, simulation models, etc.) is available on the Moodle platform.

Evaluation

The evaluation of the subject is based on:

- Exercises of continuous evaluation,
- Final exam
- Practice

Evaluation Criteria

The final grade of the subject is calculated from the theory and practice grades using the following formula:

Final_Grade = 0,8 x Theory_Grade + 0,2 x Practical_Grade

Theory_Grade = 0.45 x CE_Grade + 0.55 x Exam_Grade

CE_Grade is the arithmetic mean of the individual notes of the proposed exercises.

In order to pass the subject, it is necessary that:
- Exam_Grade equal to or greater than 4
- Theory_Grade equal to or greater than 4
- Practical_Grade equal to or greater than 5

The non-presentation of the practical part involves a mark of the NP subject.

Basic Bibliography

Robert W. Erickson, Dragan Maksimovic, Fundamentals of Power Electronics, 2nd ed., Kluwer Academic Publishers, New York, 2004.
N. Mohan, T. M. Undeland, and W. P. Robbins, Power Electronics: Converters, Applications and Design, 3rd ed.,Wiley, New York, 2003.
D. W. Hart, Power Electronics, McGraw-Hill, New York, 2011
M. H. Rashid, Electrónica de potencia – Circuitos, dispositivos y aplicaciones, 3ª edición, Pearson-Prentice Hall, México, 2004

Additional Material

[1] PRESSMAN, ABRAHAM. Switching and linear power supply, power converter design . 1998
[2] KASSAKIAN, JOHN G. Principles of power electronics. 1991
[3] Maxon Motors. www.maxon.com
[4] Linear technology www.linear.com
[5] Texas Instruments www.ti.com
[6] Analog devices www.analog.com
[7] National Semiconductor www.national.com
[8] Maxim www.maxim-ic.com
[9] Intersil www.intersil.com