Abstract—
This paper presents a novel two-stage buck-boost converter with a soft switching operation. The proposed converter is constructed of two identical buck-boost converters working in parallel. The converter units are connected to each other by an inductor as a bridge. This inductor plays an important role in the soft switching operation of the converter by maintaining the voltage applied to switches at zero at switching intervals. The utilized method is called the zero-voltage switching. It is shown that the structure of the proposed converter is significantly efficient in the reduction of switching losses, leading to the improvement of the converter effi-ciency. Moreover, because of the parallel operation of two identical converters, the output voltage and the input current contain fewer ripples than those of a single converter with the same specifications. Also, utilizing only one inductor as an extra element to achieve this goal makes the proposed converter more economical and reliable with a simpler structure. The detailed analysis of the circuit operation is provided in eight modes. The proposed method is implemented in a laboratory test circuit within the range of 100–220 W output power validating the accuracy of the proposed converter.
This paper presents a novel two-stage buck-boost converter with a soft switching operation. The proposed converter is constructed of two identical buck-boost converters working in parallel. The converter units are connected to each other by an inductor as a bridge. This inductor plays an important role in the soft switching operation of the converter by maintaining the voltage applied to switches at zero at switching intervals. The utilized method is called the zero-voltage switching. It is shown that the structure of the proposed converter is significantly efficient in the reduction of switching losses, leading to the improvement of the converter effi-ciency. Moreover, because of the parallel operation of two identical converters, the output voltage and the input current contain fewer ripples than those of a single converter with the same specifications. Also, utilizing only one inductor as an extra element to achieve this goal makes the proposed converter more economical and reliable with a simpler structure. The detailed analysis of the circuit operation is provided in eight modes. The proposed method is implemented in a laboratory test circuit within the range of 100–220 W output power validating the accuracy of the proposed converter.
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