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Dr. Roger King 


Office Hours
Spring 2020

TR  10-11 am
TR  1-2 pm
or by appointment


Office: NI 2064


Phone: 419-530-8188


 I am retired, but will teach one course this semester.


Spring 2020

8 AM

9 AM

10 AM



11 AM

EECS 3720

EECS 3720

12 PM

EECS 3720
EECS 3720
1 PM



2 PM

3 PM

4 PM


Courses this Semester

General Interest

Math Notes for Power Electronics and other Electrical Engineering Areas. This is a work-in-progress; I would appreciate your comments and corrections. 

Output Resistance of a Common-Emitter Stage. I have had to figure this one so many times you would think I would remember. 

Modeling a complicated transfer function with a simple one: low-and high-frequency cutoffs. Spice example of the effects of low- and high-frequency cutoff

If I were to write a circuits book, I would introduce the ideal transformer first, and put the practical transformer in a later chapter.  Here is my introduction to the ideal transformer.  


Research Interests

  • Power Electronics 
  • Switching Power Converters, Modeling and Control 


  • P. Chen and R. J. King, "Voltage Clamping for a Utility-Scale PV Array," IEEE EnergyTech 2012, Cleveland, OH, May 2012.  Copy here

  • P. Gerhardinger and R. King, "A New Utility Scale Inverter and Wiring Topology," presented at Solar 2011, American Solar Energy Society, Raleigh, NC, May 2011.  Copy here.

  • E. A. Mayer and R. J. King, "An Improved Sampled-Data Current-Mode-Control Model which Explains the Effects of Control Delay," IEEE Transactions on Power Electronics, Vol. 16, No. 3, pp. 369-374, May 2001.
  • Y. W. Lo and R. J. King, "Sampled-Data Modeling of the Average Input-Current-Mode-Controlled Buck Converter," IEEE Transactions on Power Electronics, Vol. 14, No. 5, pp. 918-927, September 1999. 

  • E. A. Mayer and R. J. King, "Previously Unobserved Effects of Delay on Current-Mode Control," 1999 Power Electronics Specialists' Conference Record, (plenary session), Charleston, SC, June 27-July 1, 1999, Vol I, pp. 13-18. Copy of paper in pdf format.
  • Y. W. Lo and R. J. King, "High-Performance Ripple Feedback for the Buck Unity-Power-Factor Rectifier," IEEE Transactions on Power Electronics, Vol. 10, No. 2, pp. 158-163, March 1995
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Copyright 2003, EECS Department, University of Toledo, Toledo, OH

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