Modular Multilevel DC/DC Converters with Phase Shift Control Scheme for High Voltage DC-Based Systems - 2015
During this paper, by investigating the topology derivation principle of the section-shift-controlled three-level dc/dc converters, the modular multilevel dc/dc converters, by integrating the total-bridge converters and 3-level flying capacitor circuit, are proposed for the high step-down and high power dc-primarily based systems. The high switch voltage stress in the primary side is effectively reduced by the total-bridge modules in series. Thus, the low-voltage-rated power devices will be utilized to get the advantages of low conduction losses. Additional importantly, the voltage autobalance ability among the cascaded modules is achieved by the inherent flying capacitor, which removes the additional doable active parts or management loops. In addition, zero-voltage-switching performance for all the active switches will be provided because of the part-shift control scheme, that will reduce the switching losses. The circuit operation and converter performance are analyzed intimately. Finally, the performance of the presented converter is verified by the simulation and experimental results from a a pair of-kW prototype.
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