Input Series Output Parallel (ISOP) Full-wave Rectifier for Highly Scalable and Self-balancing Multicellular AC-DC Converter

Novel multicellular ac-dc converter has been proposed for future dc power supply systems. One of characteristics of the proposed converter is the application of the Input Series Output Parallel (ISOP) connection topology of isolated and non-regulated full-wave cell rectifiers. The ISOP connection topology of the isolated and non-regulated power converters inherently achieves the self-balancing of the voltage stresses of all the cell rectifiers without any sensors, controllers and auxiliary circuits. The multicellular ac-dc power converter of various voltage levels can be fabricated by stacking the cell rectifiers without any auxiliaries, and the efficiency and the power density of the multicellular converter theoretically correspond to these performances of the single cell converter. A prototype of an AC 200 V-dc 48 V, 900 W multicellular converter using six 150 W cell rectifiers connected in ISOP has been developed, and the efficiency over 96% has been verified within the range of 20% to 100% load conditions. The proposed converter topology would facilitate the prevalence of the standardized and componentized power electronics converters, and this would contribute to realizing highly efficient power distribution network in the future highly electrified society.