Principle of Power Electronic Converter

Abstract:
In traditional theories, the converters are classified by structure and functions, the relationship of the different converters is separated and unclear. In this paper, a universal model and expression are proposed, which can help to reclassify the converters considering relations among them. Firstly, based on the basic Buck converter, the general model of the converters is built according to the volt-second balance principle. And then a unified mathematic expression of the converters is put forward. Within the appropriate boundary conditions and some possible variations of this unified expression, the expressions of the specific converters can be deduced, such as Boost, Buck-boost, Inverter and Rectifier. Within the general model and expression, T-type and multilevel converters are also easier constructed in this paper. The proposed analysis method reveals the consistency principle behind different converters, also can help engineers to understand and design the converters.