The ability of PI and PID controllers to compensate many practical processes has led to their wide acceptance in industrial applications The requirement to choose two or three controller parameters is most easily done using tuning rules Starting with a general discussion of industrial practice, the chapter will provide an outline of tuning rules for continuous-time PI and PID control of time-delayed single-input, single-output (SISO) processes

An Overview of Tuning Rules for the PI and PID Continuous-Time Control of Time-Delayed Single-Input, Single-Output (SISO) Processes

The thesis is to develop Signal Processing methods which increase the performance, functionality and reliability of dc-dc converters which is part of an ongoing project of Ericsson together with Blekinge Institute of Technology. The aim of this project is to model the buck converter system of Ericson’s BMR450 using MATLAB Simulink and develop methods to identify the capacitive load. Our first approach is to derive the equation which gives relation of capacitive load with output voltage in time domain analysis. Our second method deals with resonant point of frequency response of buck converter using Linearization method. Our final method deals in frequency domain analysis using FFT. For different values, we calculated the capacitive load values using proposed methods and compared them to the original values to observe the percentage of errors.

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Load Identification of DC-DC Buck Converter

The ripple voltage waveform of DC-DC buck converter is used for system identification Based on the parameters identified and using the user specification of gain margin and phase margin, PI controller parameter tuning rule is proposed The closed loop performance with line and load variation of the buck converter is simulated using MATLAB/SIMULINK and analyzed The robustness measure of the PI controller on the performance is also studied

K. Lavanya

Papers

System Identification and controller tuning rule for DC-DC converter using ripple voltage waveform