Study of LCCT converter topology for the use within modular architecture of power supply

Following the invention of resonant power converters, lots of new topologies with significant improvements considering increase in efficiency and power density are arising. One of the possibilities how to optimize operational behavior of the converter is modification of its power stage through implementation of resonant components or resonant tanks. Proposed paper describes this methodology, while perspective circuit topology of LCCT resonant DC–DC converter is deeply studied from operational point of view. Proposed converter was experimentally verified based on the knowledge received from theoretical analysis of operational characteristics. Steady-state operational analysis was realized together with dynamic condition investigation (start-up, short circuit), while simulation results are compared to experimental in order to prove validity of the simulation model. Presented analysis of the operation of LCCT converter explores proper behavior related to the redundancy, ensuring its suitability for modular concept of power supply even the efficiency reduction due to higher magnetizing current is evident. Consequently, the considerations are taken for the use of the proposed converter within the modular power supply in parallel input/parallel output configuration covering application of the server’s power supplies. The LCCT converter modules for target parameters of application use have been designed. Modular power supply system was experimentally verified from the efficiency point of view, while various operational scenarios related to interleaved operation are considered. Main focus during experimental measurements of modular operation are related to investigation of the influence on output current and voltage ripple and total system efficiency when one, two, or three modules are operated in various conditions related to power sharing and phase-shift change. Through this approach, the optimal settings of mentioned parameters (number of operating modules, load share, phase shift between modules) are received targeting the best efficiency for individual operational state (flat characteristic of efficiency for any load and low ripple current and/or voltage).