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Maksimovic, Dragan Charles V. Schelke Endowed Professor

Positions

Research Areas research areas

Research

research overview

  • Dr. Maksimovic's research is focused on power electronics, the technology that ties renewable sources such as photovoltaics and wind turbines to the electric power grid, propels hybrid and electric vehicles, powers a countless variety of electronic systems, and makes it possible to operate battery-powered mobile devices for many hours. Dr. Maksimovic is directing the Colorado Power Electronics Center (CoPEC) in explorations of ways to achieve significant system-level advances in energy efficiency and renewable energy sources via smart power electronics. Current research project topics include efficiency improvements in photovoltaic power systems, digital control of high-frequency switched-mode power converters, high-frequency power electronics using wide bandage semiconductors, high-efficiency radio transmitters, auto-tuning and adaptive control techniques in power conversion, electric vehicle power electronics, and battery systems.

keywords

  • Power electronics

Publications

selected publications

Teaching

courses taught

  • ECEA 5705 - Modeling, Control of Power Elec: Avged-Sw Modeling and Sim
    Primary Instructor - Spring 2020 / Summer 2020 / Fall 2020 / Spring 2021 / Summer 2021 / Fall 2021
    Focuses on practical design-oriented modeling and control of pulse-width modulated switched-mode power converters using analytical and simulation tools in time and frequency domains. A design-oriented analysis technique, the Middlebrook's feedback theorem, is introduced and applied to analysis and design of voltage regulators and other feedback circuits. Furthermore, circuit averaging and averaged-switch modeling techniques are also covered in detail.
  • ECEA 5706 - Modeling, Control of Power Elec: Tech Dsgn-Oriented Analysis
    Primary Instructor - Fall 2020 / Spring 2021 / Summer 2021 / Fall 2021
    Focuses on two techniques of design-oriented analysis, Middlebrook's extra-element theorem (EET), and n-extra-element theorem (NEET). It is shown how EET simplifies circuit analysis and design, provides insights into effects of circuit elements initially neglected, and to formulate design approaches. NEET allows designers to easily derive complex transfer functions in circuits such as converter filters and averaged circuit models.
  • ECEA 5707 - Modeling, Control of Power Elec: Input Filter Design
    Primary Instructor - Fall 2020 / Spring 2021 / Summer 2021 / Fall 2021
    To meet electromagnetic interference (EMI) requirements and mitigate effects of switching noise, switching power converters often require input filters. Using extra-element theorem, it is shown how adding an input filter may compromise system stability, and impedance criteria are formulated to mitigate system stability issues. Input filter design techniques are developed for single-stage and multi-stage filters to meet several design criteria.
  • ECEA 5708 - Modeling, Control of Power Elec: Current-mode Control
    Primary Instructor - Fall 2020 / Spring 2021 / Summer 2021 / Fall 2021
    Control loops around switch-mode power converters are often based on current-mode control techniques. This course is focuses on analysis, modeling and design of current programmed mode or peak current mode (PCM) control, as well as average current mode (ACM) control. Sampling effects and compensation ramp concepts are introduced. Averaged dynamic models and transfer functions of PCM-controlled converters are developed.
  • ECEA 5709 - Modeling, Control of Power Elec: Mod/Ctrl 1-Phase Rect/Inv
    Primary Instructor - Spring 2021 / Summer 2021 / Fall 2021
    Covers pulse-width modulated (PWM) converters connected to the single-phase ac power grid. Harmonic standards and the need for power factor correction are discussed. Modeling and control techniques for PWM rectifiers include design of input current control and output voltage control. Modeling and control of single-phase inverters are introduced in the context of a solar photovoltaic power system.
  • ECEA 5715 - Power Electronics Capstone Project
    Primary Instructor - Fall 2020 / Spring 2021 / Summer 2021 / Fall 2021
    A design project that applies the material of courses ECEA 5700, 5701, 5702, 5703, and 5705 to design and verify a bidirectional dc-dc converter and its controller, to interface a lithium-polymer battery to a USB-C device. Three milestones demonstrate: design and steady-state operation of converter power stage, averaged modeling and design of converter controller, and closed-loop transient response and regulation.
  • ECEN 2270 - Electronics Design Lab
    Primary Instructor - Spring 2018
    Provides an introduction to analysis, modeling, design, and testing of analog electronic circuits in a practical laboratory setting. The laboratory is centered around a robot platform and includes design, SPICE simulations, prototyping and testing of circuits necessary to drive and remotely control the robot.
  • ECEN 4797 - Introduction to Power Electronics
    Primary Instructor - Fall 2019
    An introduction to switched-mode converters. Includes steady-state converter modeling and analysis, switch realization, discontinuous conduction mode and transformer-isolated converters. Ac modeling of converters using averaged methods, small-signal transfer functions, feedback loop design and transformer design. Same as ECEN 5797.
  • ECEN 4827 - Analog IC Design
    Primary Instructor - Fall 2018 / Fall 2020 / Fall 2021
    Covers the fundamentals of transistor-level analog integrated circuit design. Starting with motivations from application circuits, the course develops principles of dc biasing, device models, amplifier stages, frequency response analysis and feedback and compensation techniques for multi-stage operational amplifiers. Same as ECEN 5827.
  • ECEN 5007 - Special Topics
    Primary Instructor - Fall 2018 / Fall 2019 / Fall 2020 / Fall 2021
    Examines a special topic in Electrical, Computer and Energy Engineering. May be repeated up to 9 total credit hours.
  • ECEN 5797 - Introduction to Power Electronics
    Primary Instructor - Fall 2019
    An introduction to switched-mode converters. Includes steady-state converter modeling and analysis, switch realization, discontinuous conduction mode and transformer-isolated converters. Ac modeling of converters using averaged methods, small-signal transfer functions, feedback loop design and transformer design. Same as ECEN 4797.
  • ECEN 5807 - Modeling and Control of Power Electronic Systems
    Primary Instructor - Spring 2019 / Spring 2021
    Studies modeling and control topics in power electronics. Averaged switch modeling of converters, computer simulation, ac modeling of the discontinuous conduction mode, the current programmed mode, nulldouble injection techniques in linear circuits, input filter design, and low-harmonic rectifiers.
  • ECEN 5817 - Resonant and Soft-Switching Techniques in Power Electronics
    Primary Instructor - Spring 2020
    Covers resonant converters and inverters, and soft switching; sinusoidal approximations in analysis of series, parallel, LCC, and other resonant dc-dc and dc-ac converters; state-plane analysis of resonant circuits; switching transitions in hand-switched and soft-switched PWM converters; zero-voltage switching techniques, including resonant, quasi resonant, zero voltage transition, and auxiliary switch circuits.
  • ECEN 5827 - Analog IC Design
    Primary Instructor - Fall 2018 / Fall 2020 / Fall 2021
    Covers the fundamentals of transistor-level analog integrated circuit design. Starting with motivations from application circuits, the course develops principles of dc biasing, device models, amplifier stages, frequency response analysis and feedback and compensation techniques for multi-stage operational amplifiers. Same as ECEN 4827.
  • ECEN 6950 - Master's Thesis
    Primary Instructor - Spring 2021 / Fall 2021
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