Bidirectional multi-port dc-dc converter with low voltage stress on switches and diodes

In this study, a new transformer-less multi-port dc-dc converter with bidirectional capability is proposed. The proposed converter has dual inputs and dual outputs in which one of the inputs is considered energy storage (ES) such as a battery. Owing to the bidirectional capability, charging and discharging of the ES are provided. In the charging mode, the energy of the regenerative braking can charge the battery. These features make the proposed converter suitable for hybrid energy systems. Continuous charging and discharging current of the battery, low normalised peak voltage stress (NPVS) on semiconductors, and step-up capability are other advantages of the proposed converter. Reduced NPVS causes the semiconductors with low turn-on resistance and reduced rating voltage to be utilised. The performance analysis of the proposed converter in charging and discharging modes is described. Finally, the performance of the converter and mathematical analysis are validated by experimental results.