Computer-Aided Comprehensive Operation Analysis of DC–DC Converters Considering Uncertain States of Diodes

Unlike controllable switches, the on/off states of diodes are uncertain, which often results in various unknown operation modes for converters under different working conditions. Thus, the comprehensive operation analysis of converters is usually hard to achieve with the conventional manual analysis method. Aiming to overcome this shortcoming, a computer-aided automatic analysis method of dc–dc converters is proposed in this article. First, the converter is mathematically modeled on the basis of electrical network theory, so that its analysis can be further processed in the computer program. Then, all possible working states of diodes in different switching modes are automatically evaluated according to fundamental circuit law. Finally, by arbitrarily combining the feasible submodes, comprehensive operation modes of converters satisfying the power electronics principle are automatically derived. More than that, their corresponding steady-state performance analysis results including operation mode boundaries, voltage gains, and components' voltage/current would be obtained simultaneously. Therefore, the proposed computer-aided automatic analysis method is not only capable of conveniently obtaining a comprehensive understanding of different converters after considering uncertain states of diodes, but also is beneficial for the converter design in engineering applications.