Bidirectional AC to DC Isolated Multi-Cell Converter

This paper presents the implementation of a bidirectional multi-level voltage inverter, isolated converter based on a multi-cell architecture for battery charger applications. Dual Active Bridge based DC to DC isolated converter cells are cascaded with H bridges which are then associated in series to implement a multi-level topology able to produce AC waves from DC source and vice versa. The operating principle is provided along with converter main advantages and drawbacks. A special attention is dedicated to the control part. The operation of the multi-level converter is validated with experimental results. A special care is applied to efficiency measurements. Efficiency and power densities are provided to highlight the interest of the converter.