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Developing An Induction Heating System Laboratory With Dsp Microprocessors And Power Electronic Devices

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2008 Annual Conference & Exposition


Pittsburgh, Pennsylvania

Publication Date

June 22, 2008

Start Date

June 22, 2008

End Date

June 25, 2008



Conference Session

Computer Applications in Energy Courses

Tagged Division

Energy Conversion and Conservation

Page Count


Page Numbers

13.391.1 - 13.391.11



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Paper Authors


Frank Li Youngstown State University

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Dr. Li received the B.S. in electrical engineering from Ohio State University, Columbus, OH in 1996. He received the Ph.D. degree in electrical engineering from Case Western Reserve University, Cleveland, OH in 2005.

Dr. Li is currently an assistant professor in Department of Electrical and Computer Engineering, Youngstown State University in Ohio. He has 11 years industrial experience. His current research interest includes electron spin resonance imaging, EMC, advanced control applications, and applied magnetic fields in biomedical and spintronic applications.

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Theodore Burke Ajax Tocco

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Theodore E. Burke is Director of R&D at Ajax Tocco Magnethermic.
His positions within the company include Service Engineering, Production Engineering
and International Engineering. The R&D Dept develops Power Supplies and
their controls for Industrial Metal Markets.

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Jalal Jalali Youngstown State University

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Dr. Jalali received the B.S. degree in electrical engineering from University of Missouri, Columbia, MO in 1979. He received the Ph.D. degree in electrical engineering from University of Missouri, Columbia, MO in 1984.

Dr. jalali is currently the chair and professor of Department of Electrical and Computer Engineering, Youngstown State University in Ohio. His current research interest includes Power Systems, Electromagnetics, & Power Electronics & Industrial Controls.

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NOTE: The first page of text has been automatically extracted and included below in lieu of an abstract

Developing an Induction Heating System Laboratory with DSP Microprocessors and Power Electronic Devices Abstract

This induction heating system laboratory will be integrated into our existing energy conversion labs for senior students. Students will not only understand how the high alternating current induces eddy current in the work piece to convert the resistive losses into thermal energy, but will also observe that the work piece gradually heats up and eventually starts to glow red.

The principle of induction heating is to convert electricity to thermal energy inside a conductive work piece by using alternating magnetic fields. The energy conversion efficiency is up to 95% for magnetic materials, and contamination is minimized due to the non-contact heating mode. Therefore, induction heating has been widely used in steel industries for many years. Most engineering students are baffled by magnetic field theories since magnetic fields are not something that they can see, touch or feel except through mathematical equations. To assist students’ understanding of this energy conversion process, we are developing an induction heating system laboratory to cover engineering topics in applied magnetic field theories, communication systems, computer networks, power systems, power electronics, sensors, embedded systems, and control systems.

In order to generate high strength alternating electromagnetic fields, a switching mode power supply is utilized to feed high frequency current to the induction coils. The major components of the switching mode power supply are DC diode bridges, DC filters, DC-AC IGBT invertors, matching transformers, and capacitor banks. A DSP microprocessor development board is utilized to generate the Pulse Width Modulation signals to drive IGBT devices. Also, zero- voltage switching techniques and closed-loop controls are used to control the output power levels. Infinite impulse filters and fast Fourier transform are built into the DSP microprocessors to obtain real time frequency spectrum analysis of system harmonics. The temperature of the work piece can be observed by using an infrared temperature sensor and the measured temperature can also be fed back to the main DSP microprocessor. The proper output power level adjustment by the microprocessor creates better temperature profiles in the work piece.

The students are exposed to the commercial finite-element magnetic field analysis software which provides a visual representation of the magnetic field in the form of flux line plots and scaled color maps. In our current energy propagation class, we introduce and utilize Infolytica MagNet® to calculate the magnetic field strength at different frequencies. This software package can also generate animations of alternating current magnetic fluxes in the work piece.


Induction heating is a process by which the temperature of a metal part is raised by the eddy current losses within the material. It must also be noted that the work piece is only coupled, not physically connected to the power supply circuitries. The non-contact induction heating provides a clean energy conversion from electricity to thermal energy that has a few advantages over the conventional gas heating furnaces, including faster heating time, precise temperature

Li, F., & Burke, T., & Jalali, J. (2008, June), Developing An Induction Heating System Laboratory With Dsp Microprocessors And Power Electronic Devices Paper presented at 2008 Annual Conference & Exposition, Pittsburgh, Pennsylvania. 10.18260/1-2--4025

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