Analysis and design of a parallel and source splitting configuration using SEPIC modules based on power balance control technique

The analysis and design of a parallel and source splitting structure based on power balance control are presented in this paper. SEPIC topology offers the benefits of single-stage transformer-isolated, output voltage step up or step down, magnetic coupling. The goal of the proposed system is to reduce the number of stages and improve dynamic response. The proposed schemes offer flexibility in either 1-phase or 3-phase system (3 or 4 wire), simpler design, reduce number of controllable switches and increasing reliability of the system. Each converter operates in CCM together with hysteresis current control. The experimental results demonstrate that the proposed system works well, fast dynamic response, simple control strategy, good power factor correction and the inductor current sharing is achieved by controlling duty-ratio for all modules. Each converter module is designed to provide the DC output voltage and power of 48 V and 300 W respectively. Also the total power system rating is 600 W, for the redundancy propose