Publication Date
2015
Document Type
Thesis
Committee Members
Marian K. Kazimierczuk, Ph.D. (Advisor); Yan Zhuang, Ph.D. (Committee Member); Lavern Alan Starman, Ph.D. (Committee Member)
Degree Name
Master of Science in Electrical Engineering (MSEE)
Abstract
In this thesis, an average current-mode controller is analyzed for controlling power electronic converters. This controller consists of two loops. An inner loop, which senses and controls the inductor current and an outer loop, which is used to control the output voltage and provide reference voltage for the inner current loop. An average current-mode controller averages out high frequency harmonics it senses from the inductor current to provide a smooth DC component. This can be used as a control voltage for a pulse width modulator and produce switching pulses for the power electronic converters. An average current-mode controller can also be designed for a good bandwidth, which helps in accurate tracking of the sensed inductor current. For a better understanding of the operation of an average current-mode controller analytical equations are derived. Many transfer functions, which help analyze the properties of an open loop system, the controller transfer functions and a block diagram representing the converter along with current and voltage-control loops are presented. The block diagram and the transfer functions were used to derive the required controller parameters on MATLAB. The designed converter along with the controller is implemented on SABER circuit simulator. Waveforms representing the analytical equations along with the dynamic properties of the converter with the controller were plotted. The plotted SABER simulations were in agreement with the analytical equations. The designed controller was able to produce a controlled output voltage for step change in input voltage and load resistance, when simulated on SABER. Ripples could be observed in the control voltage of the controller, when designed for a good bandwidth. This was also represented by the derived analytical equations.
Page Count
84
Department or Program
Department of Electrical Engineering
Year Degree Awarded
2015
Copyright
Copyright 2015, all rights reserved. My ETD will be available under the "Fair Use" terms of copyright law.
