Design and Implementation of Four Switches Bidirectional DC-DC Converter with Switched Inductors

This research presents a novel architecture for a bidirectional DC-DC converter. The primary purpose of converter is to facilitate energy transfer between battery side and DC bus. One of the key benefits of this architecture is its improved efficiency and reduced volume. To achieve this, the converter utilizes an active switched inductor structure. In the step-up mode, parallel charging and series discharging are accomplished by employing two sets of synchronous switches and two inductors. Conversely, in the step-down mode, series charging, and parallel discharging are achieved using the same configuration. To verify that the proposed architecture and control system are viable, a bidirectional DC-DC converter was developed using the TMS320F28379D as the controller. The converter operates with one low voltage input of 48V on one side, and one high voltage of 400V on the other side, the rated output power is designed to 500W, and a switching frequency of 500kHz. The experimental results demonstrate promising performance, with an efficiency of up to 92.2% in step-up mode and 94.2% in the step-down mode. These findings highlight effectiveness of this architecture in achieving high efficiency energy transfer.