Single-Inductor-Dual-Output Bipolar Converter Steady State Analysis
Date Issued
2011
Date
2011
Author(s)
Wu, Tsung-Han
Abstract
Multiple voltages are often required for powering many hand-held electronic devices. In such applications, multiple DC-DC converters are often used to convert from a battery to proper multiple output voltages. Each converter usually requires one inductor for the power conversion. Therefore, multiple inductors are used for such application that is relatively bulky and heavy. In recent years, however, a new class of converters has been reported which is capable of providing multiple outputs using only single inductor. In this thesis, a converter from this family , the single-inductor dual output ( SIDO) will be investigated. This converter is capable of providing two outputs, one positive and the other negative voltages. It''s therefore called SIDO bipolar converter in this thesis.
An comprehensive DC analysis is performed in this thesis. From the analysis, DC equations are developed for relating various converter parameters such as voltage gains, transistor duty cycles , switching frequency, inductance, and load currents. Both the continuous mode and the discontinuous mode of converter operation are considered. These equations are much more complicated than its single-output counterpart. Algorithms are also developed for finding out the necessary duty cycles for the two transistor switches for a given converter input-output specification. It turns out that the feedback pulse-width modulation scheme also affects the DC characteristics. Simulaton and experimental results are also given to verify the theoretical equations. The results obtained in this thesis are useful for designing the SIDO bopolar converters.
Subjects
DC/DC power converters
single-inductor dual-output (SIDO) bipolar converter
Type
thesis
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