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.
| Identifer | oai:union.ndltd.org:TORONTO/oai:tspace.library.utoronto.ca:1807/18935 |
| Date | 15 February 2010 |
| Creators | Ng, Kendy Chun-Wa |
| Contributors | Ng, Wai Tung |
| Source Sets | University of Toronto |
| Language | en_ca |
| Detected Language | English |
| Type | Thesis |
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