An Isolated Composite Resonant Multilevel Converter with Partial Power Voltage Regulation for Telecom Application

In this paper, an new converter that includes isolated composite resonant multilevel converter (ICRMC) that uses composite converter concept and partial power voltage regulator (PPVR) has been proposed for telecommunication application. The proposed converter can achieve high efficiency at nominal operating point since it takes minimum effort to regulate the output voltage at this point. A comparative study shows that with the proposed two operation modes of ICRMC, the proposed converter has the best capability to maintain lowest total semiconductor power stress among the existing state of the art solutions when the input voltage varies from 36V to 60V. Furthermore, zero current switching (ZCS) can be always achieved on the switching devices in ICRMC under different operating points. A 600W converter has been simulated to validate the theoretical analysis. The estimated peak efficiency can be as high as 97.65%. Fully debugged prototype and experimental results are provided in this paper.