A completely modular power converter for high-power high-current DC applications

This paper presents a completely modular power supply for high-power and high-current DC applications. The proposed power converter utilizes modular blocks consisting of a half bridge cell followed by an isolated DC-DC converter. The modules are connected in series at the input AC side in the fashion of a modular multilevel rectifier. At the output DC side, the modules are connected in parallel to supply a high-current load. The proposed configuration provides advantages like modularity, isolation, high efficiency, high input power factor, good input current quality and controlled output current over the full operating range. Circuit configuration, control and performance of the proposed system are discussed in detail. Simulation results are presented to verify the performance and effectiveness of the system.