B.N. Gentry, N.M. Schmitt, and T.W. Martin (USA)
Disturbance accommodation control, switching power converters
This research explores the possibility of using DAC theory to improve switching converter performance. State-space controllers with and without disturbance accommodation were designed and simulated in Matlab. Designs were evaluated for their response to step input voltages and load changes acting on the system. Switch-mode power converters are used to convert unregulated DC input into a controlled DC output at a desired voltage level. Load changes complicate this process by introducing voltage fluctuations and steady state errors. 2. System IdentificationDisturbance accommodation control (DAC) theory can be applied to voltage regulator applications by assuming that external disturbances or load variations resemble a known waveform type, such as step, ramp, and/or sinusoidal functions. This research investigates the feasibility of adding disturbance accommodation control to a switch mode power converter in order to improve performance. State-space controllers with and without disturbance accommodation were designed and simulated in Matlab. Designs were evaluated for their response to step input voltages and load changes acting on the system. Put simply, a switching converter is a power electronic device that converts one level of electrical energy into another level of electrical energy, at the load, by a switching action [2]. The average output voltage is regulated by controlling the on and off durations of semiconductor switches. The arrangement of these switches and the energy storage elements defines the topology of the converter. Output voltage is maintained by pulse-width modulating (PWM) the control signal entering the base/gate of the switching transistor. For the purposes of this research, we will focus our attention on the buck topology (step-down) in continuous conduction mode, where the inductor current changes in value but is continually flowing during switching. The switching converter was designed to have a source voltage of twelve volts with an output of five volts. These parameters are commonly used in DC-DC converter applications.
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