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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/18935

Title: A Digitally Controlled Dual Output Stage Buck Converter with Transient Suppression
Authors: Ng, Kendy Chun-Wa
Advisor: Ng, Wai Tung
Department: Electrical and Computer Engineering
Keywords: DC-DC Converters
Transient Response
Digital Control
Issue Date: 15-Feb-2010
Abstract: To support the increasingly demanding requirements for power conversion units, a digitally controlled dual output stage buck converter is designed. The system consists of a dual output stage, which includes an auxiliary buck output stage connected in parallel with a main output stage. The auxiliary output stage is only active during load transient to suppress the output voltage variation. A digital controller is designed to control both stages with a linear/nonlinear control scheme. Nonlinear control is applied during load transient based on the capacitor charge balance principle; whereas linear PID control governs the steady state operation. The design is verified with simulation and experimentally with discrete components. The controller is realized with a FPGA with preset output stage parameters. The experimental result shows a 60% reduction of output voltage variation for a heavy-to-light load transient.
URI: http://hdl.handle.net/1807/18935
Appears in Collections:Master
The Edward S. Rogers Sr. Department of Electrical & Computer Engineering - Master theses

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