A Novel Nonisolated GaN-Based Bidirectional DC-DC Converter With High Voltage Gain

A nonisolated bidirectional dc-dc converter is proposed for energy storage systems in this article. The proposed converter is composed of three active switches, two synchronous rectifiers, two clamping capacitors, and two inductors. The proposed converter has advantages of being a simple structure, a fewer number of components, a common ground, lower voltage stress, and wide voltage gain range. Compared with the conventional buck converters, the novel converter triples the effective duty cycle and lowers voltage stresses across the active switches. A 300-W/500-kHz GaN-based experimental prototype is built and tested to verify the correctness and validity, demonstrating a peak efficiency of 94.54% in step-down mode and a peak efficiency of 94.88% in step-up mode.

Automated summary

A nonisolated bidirectional dc-dc converter is proposed for energy storage systems, which has the advantages of simple structure, fewer components, common ground, lower voltage stress, and wide voltage gain range. Compared with conventional buck converters, the novel converter increases the effective duty cycle and reduces voltage stresses across the active switches.