Analyses of Single-Inductor Dual-Output (SIDO) DC/DC Converters
Date Issued
2012
Date
2012
Author(s)
Huang, Chun-Shih
Abstract
A single-inductor dual-output (SIDO) DC/DC converter has recently found applications in hand-held battery-powered electronic devices. The circuit operation and the functional interdependencies among basic converter parameters such as DC voltage gains, transistor duty cycles, and load current levels are much more complicated than those of the single-output counterpart. In this dissertation, a comprehensive analysis is conducted to develop DC characteristic equations for three basic SIDO converters: SIDO buck, SIDO boost, and SIDO bipolar converters. From the analysis results, a discovery of a new mode of operation, dubbed “mixed-voltage” operation, is pointed out. In the so-called “mixed-voltage” operation, it was discovered, contrary to conventional thinking, that the SIDO buck and SIDO boost can respectively step-up and step-down one of the output voltages. And the SIDO bipolar can also step down the positive output voltage previously deemed not possible. Therefore, this possibility not only opens up new applications but also may extend the workable battery range in existing applications. Simulation and experimental results are presented to confirm the theoretical results.
Subjects
DC/DC converters
single-inductor dual-output (SIDO)
mixed-voltage conversion
Type
thesis
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