Converter Circuits

Overview

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This course can also be taken for academic credit as ECEA 5701, part of CU Boulder’s Master of Science in Electrical Engineering degree. This course introduces more advanced concepts of switched-mode converter circuits. Realization of the power semiconductors in inverters or in converters having bidirectional power flow is explained. Power diodes, power MOSFETs, and IGBTs are explained, along with the origins of their switching times. Equivalent circuit models are refined to include the effects of switching loss. The discontinuous conduction mode is described and analyzed. A number of well-known converter circuit topologies are explored, including those with transformer isolation. The homework assignments include a boost converter and an H-bridge inverter used in a grid-interfaced solar inverter system, as well as transformer-isolated forward and flyback converters. After completing this course, you will: ● Understand how to implement the power semiconductor devices in a switching converter ● Understand the origins of the discontinuous conduction mode and be able to solve converters operating in DCM ● Understand the basic dc-dc converter and dc-ac inverter circuits ● Understand how to implement transformer isolation in a dc-dc converter, including the popular forward and flyback converter topologies Completion of the first course Introduction to Power Electronics is the assumed prerequisite for this course.

Syllabus

Ch 4.1: Switch Realization

How to implement the switches using transistors and diodes, including applications having bidirectional power flow or ac outputs.

Ch 4.2: Power Semiconductor Switches

Basics of power semiconductor switches, including the origins of switching times and switching loss. How to incorporate switching loss into equivalent circuit models. MOSFETs, IGBTs, and gate driver considerations.

Ch 5: Discontinuous Conduction Mode

The discontinuous conduction mode (DCM) arising from unidirectional switch realization. Analysis of mode boundaries and output voltage.

Ch 6: Converter Circuits

Some well-known converter circuits and their origins. How to incorporate transformer isolation into a dc-dc converter. Analysis and equivalent circuit modeling of transformer-isolated converters.